1 /*
2 * SSL/TLS interface functions for OpenSSL
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #ifndef CONFIG_SMARTCARD
12 #ifndef OPENSSL_NO_ENGINE
13 #ifndef ANDROID
14 #define OPENSSL_NO_ENGINE
15 #endif
16 #endif
17 #endif
18
19 #include <openssl/ssl.h>
20 #include <openssl/err.h>
21 #include <openssl/opensslv.h>
22 #include <openssl/pkcs12.h>
23 #include <openssl/x509v3.h>
24 #ifndef OPENSSL_NO_ENGINE
25 #include <openssl/engine.h>
26 #endif /* OPENSSL_NO_ENGINE */
27 #ifndef OPENSSL_NO_DSA
28 #include <openssl/dsa.h>
29 #endif
30 #ifndef OPENSSL_NO_DH
31 #include <openssl/dh.h>
32 #endif
33
34 #include "common.h"
35 #include "crypto.h"
36 #include "sha1.h"
37 #include "sha256.h"
38 #include "tls.h"
39 #include "tls_openssl.h"
40
41 #if !defined(CONFIG_FIPS) && \
42 (defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || \
43 defined(EAP_SERVER_FAST))
44 #define OPENSSL_NEED_EAP_FAST_PRF
45 #endif
46
47 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || \
48 defined(EAP_SERVER_FAST) || defined(EAP_TEAP) || \
49 defined(EAP_SERVER_TEAP)
50 #define EAP_FAST_OR_TEAP
51 #endif
52
53
54 #if defined(OPENSSL_IS_BORINGSSL)
55 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
56 typedef size_t stack_index_t;
57 #else
58 typedef int stack_index_t;
59 #endif
60
61 #ifdef SSL_set_tlsext_status_type
62 #ifndef OPENSSL_NO_TLSEXT
63 #define HAVE_OCSP
64 #include <openssl/ocsp.h>
65 #endif /* OPENSSL_NO_TLSEXT */
66 #endif /* SSL_set_tlsext_status_type */
67
68 #if (OPENSSL_VERSION_NUMBER < 0x10100000L || \
69 (defined(LIBRESSL_VERSION_NUMBER) && \
70 LIBRESSL_VERSION_NUMBER < 0x20700000L)) && \
71 !defined(BORINGSSL_API_VERSION)
72 /*
73 * SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL
74 * 1.1.0 and newer BoringSSL revisions. Provide compatibility wrappers for
75 * older versions.
76 */
77
SSL_get_client_random(const SSL * ssl,unsigned char * out,size_t outlen)78 static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
79 size_t outlen)
80 {
81 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
82 return 0;
83 os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE);
84 return SSL3_RANDOM_SIZE;
85 }
86
87
SSL_get_server_random(const SSL * ssl,unsigned char * out,size_t outlen)88 static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
89 size_t outlen)
90 {
91 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
92 return 0;
93 os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE);
94 return SSL3_RANDOM_SIZE;
95 }
96
97
98 #ifdef OPENSSL_NEED_EAP_FAST_PRF
SSL_SESSION_get_master_key(const SSL_SESSION * session,unsigned char * out,size_t outlen)99 static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
100 unsigned char *out, size_t outlen)
101 {
102 if (!session || session->master_key_length < 0 ||
103 (size_t) session->master_key_length > outlen)
104 return 0;
105 if ((size_t) session->master_key_length < outlen)
106 outlen = session->master_key_length;
107 os_memcpy(out, session->master_key, outlen);
108 return outlen;
109 }
110 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
111
112 #endif
113
114 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
115 (defined(LIBRESSL_VERSION_NUMBER) && \
116 LIBRESSL_VERSION_NUMBER < 0x20700000L)
117 #ifdef CONFIG_SUITEB
RSA_bits(const RSA * r)118 static int RSA_bits(const RSA *r)
119 {
120 return BN_num_bits(r->n);
121 }
122 #endif /* CONFIG_SUITEB */
123
124
ASN1_STRING_get0_data(const ASN1_STRING * x)125 static const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x)
126 {
127 return ASN1_STRING_data((ASN1_STRING *) x);
128 }
129 #endif
130
131 #ifdef ANDROID
132 #include <openssl/pem.h>
133 #include <keystore/keystore_get.h>
134
135 #include <log/log.h>
136 #include <log/log_event_list.h>
137
138 #define CERT_VALIDATION_FAILURE 210033
139
log_cert_validation_failure(const char * reason)140 static void log_cert_validation_failure(const char *reason)
141 {
142 android_log_context ctx = create_android_logger(CERT_VALIDATION_FAILURE);
143 android_log_write_string8(ctx, reason);
144 android_log_write_list(ctx, LOG_ID_SECURITY);
145 android_log_destroy(&ctx);
146 }
147
148
BIO_from_keystore(const char * key)149 static BIO * BIO_from_keystore(const char *key)
150 {
151 BIO *bio = NULL;
152 uint8_t *value = NULL;
153 int length = keystore_get(key, strlen(key), &value);
154 if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
155 BIO_write(bio, value, length);
156 free(value);
157 return bio;
158 }
159
160
tls_add_ca_from_keystore(X509_STORE * ctx,const char * key_alias)161 static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias)
162 {
163 BIO *bio = BIO_from_keystore(key_alias);
164 STACK_OF(X509_INFO) *stack = NULL;
165 stack_index_t i;
166
167 if (bio) {
168 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
169 BIO_free(bio);
170 }
171
172 if (!stack) {
173 wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s",
174 key_alias);
175 return -1;
176 }
177
178 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
179 X509_INFO *info = sk_X509_INFO_value(stack, i);
180
181 if (info->x509)
182 X509_STORE_add_cert(ctx, info->x509);
183 if (info->crl)
184 X509_STORE_add_crl(ctx, info->crl);
185 }
186
187 sk_X509_INFO_pop_free(stack, X509_INFO_free);
188
189 return 0;
190 }
191
192
tls_add_ca_from_keystore_encoded(X509_STORE * ctx,const char * encoded_key_alias)193 static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx,
194 const char *encoded_key_alias)
195 {
196 int rc = -1;
197 int len = os_strlen(encoded_key_alias);
198 unsigned char *decoded_alias;
199
200 if (len & 1) {
201 wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s",
202 encoded_key_alias);
203 return rc;
204 }
205
206 decoded_alias = os_malloc(len / 2 + 1);
207 if (decoded_alias) {
208 if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) {
209 decoded_alias[len / 2] = '\0';
210 rc = tls_add_ca_from_keystore(
211 ctx, (const char *) decoded_alias);
212 }
213 os_free(decoded_alias);
214 }
215
216 return rc;
217 }
218
219 #endif /* ANDROID */
220
221 static int tls_openssl_ref_count = 0;
222 static int tls_ex_idx_session = -1;
223
224 struct tls_context {
225 void (*event_cb)(void *ctx, enum tls_event ev,
226 union tls_event_data *data);
227 void *cb_ctx;
228 int cert_in_cb;
229 char *ocsp_stapling_response;
230 };
231
232 static struct tls_context *tls_global = NULL;
233
234
235 struct tls_data {
236 SSL_CTX *ssl;
237 unsigned int tls_session_lifetime;
238 int check_crl;
239 int check_crl_strict;
240 char *ca_cert;
241 unsigned int crl_reload_interval;
242 struct os_reltime crl_last_reload;
243 char *check_cert_subject;
244 };
245
246 struct tls_connection {
247 struct tls_context *context;
248 struct tls_data *data;
249 SSL_CTX *ssl_ctx;
250 SSL *ssl;
251 BIO *ssl_in, *ssl_out;
252 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
253 ENGINE *engine; /* functional reference to the engine */
254 EVP_PKEY *private_key; /* the private key if using engine */
255 #endif /* OPENSSL_NO_ENGINE */
256 char *subject_match, *altsubject_match, *suffix_match, *domain_match;
257 char *check_cert_subject;
258 int read_alerts, write_alerts, failed;
259
260 tls_session_ticket_cb session_ticket_cb;
261 void *session_ticket_cb_ctx;
262
263 /* SessionTicket received from OpenSSL hello_extension_cb (server) */
264 u8 *session_ticket;
265 size_t session_ticket_len;
266
267 unsigned int ca_cert_verify:1;
268 unsigned int cert_probe:1;
269 unsigned int server_cert_only:1;
270 unsigned int invalid_hb_used:1;
271 unsigned int success_data:1;
272 unsigned int client_hello_generated:1;
273 unsigned int server:1;
274
275 u8 srv_cert_hash[32];
276
277 unsigned int flags;
278
279 X509 *peer_cert;
280 X509 *peer_issuer;
281 X509 *peer_issuer_issuer;
282
283 unsigned char client_random[SSL3_RANDOM_SIZE];
284 unsigned char server_random[SSL3_RANDOM_SIZE];
285
286 u16 cipher_suite;
287 int server_dh_prime_len;
288 };
289
290
tls_context_new(const struct tls_config * conf)291 static struct tls_context * tls_context_new(const struct tls_config *conf)
292 {
293 struct tls_context *context = os_zalloc(sizeof(*context));
294 if (context == NULL)
295 return NULL;
296 if (conf) {
297 context->event_cb = conf->event_cb;
298 context->cb_ctx = conf->cb_ctx;
299 context->cert_in_cb = conf->cert_in_cb;
300 }
301 return context;
302 }
303
304
305 #ifdef CONFIG_NO_STDOUT_DEBUG
306
_tls_show_errors(void)307 static void _tls_show_errors(void)
308 {
309 unsigned long err;
310
311 while ((err = ERR_get_error())) {
312 /* Just ignore the errors, since stdout is disabled */
313 }
314 }
315 #define tls_show_errors(l, f, t) _tls_show_errors()
316
317 #else /* CONFIG_NO_STDOUT_DEBUG */
318
tls_show_errors(int level,const char * func,const char * txt)319 static void tls_show_errors(int level, const char *func, const char *txt)
320 {
321 unsigned long err;
322
323 wpa_printf(level, "OpenSSL: %s - %s %s",
324 func, txt, ERR_error_string(ERR_get_error(), NULL));
325
326 while ((err = ERR_get_error())) {
327 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
328 ERR_error_string(err, NULL));
329 }
330 }
331
332 #endif /* CONFIG_NO_STDOUT_DEBUG */
333
334
tls_crl_cert_reload(const char * ca_cert,int check_crl)335 static X509_STORE * tls_crl_cert_reload(const char *ca_cert, int check_crl)
336 {
337 int flags;
338 X509_STORE *store;
339
340 store = X509_STORE_new();
341 if (!store) {
342 wpa_printf(MSG_DEBUG,
343 "OpenSSL: %s - failed to allocate new certificate store",
344 __func__);
345 return NULL;
346 }
347
348 if (ca_cert && X509_STORE_load_locations(store, ca_cert, NULL) != 1) {
349 tls_show_errors(MSG_WARNING, __func__,
350 "Failed to load root certificates");
351 X509_STORE_free(store);
352 return NULL;
353 }
354
355 flags = check_crl ? X509_V_FLAG_CRL_CHECK : 0;
356 if (check_crl == 2)
357 flags |= X509_V_FLAG_CRL_CHECK_ALL;
358
359 X509_STORE_set_flags(store, flags);
360
361 return store;
362 }
363
364
365 #ifdef CONFIG_NATIVE_WINDOWS
366
367 /* Windows CryptoAPI and access to certificate stores */
368 #include <wincrypt.h>
369
370 #ifdef __MINGW32_VERSION
371 /*
372 * MinGW does not yet include all the needed definitions for CryptoAPI, so
373 * define here whatever extra is needed.
374 */
375 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
376 #define CERT_STORE_READONLY_FLAG 0x00008000
377 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
378
379 #endif /* __MINGW32_VERSION */
380
381
382 struct cryptoapi_rsa_data {
383 const CERT_CONTEXT *cert;
384 HCRYPTPROV crypt_prov;
385 DWORD key_spec;
386 BOOL free_crypt_prov;
387 };
388
389
cryptoapi_error(const char * msg)390 static void cryptoapi_error(const char *msg)
391 {
392 wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
393 msg, (unsigned int) GetLastError());
394 }
395
396
cryptoapi_rsa_pub_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)397 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
398 unsigned char *to, RSA *rsa, int padding)
399 {
400 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
401 return 0;
402 }
403
404
cryptoapi_rsa_pub_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)405 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
406 unsigned char *to, RSA *rsa, int padding)
407 {
408 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
409 return 0;
410 }
411
412
cryptoapi_rsa_priv_enc(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)413 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
414 unsigned char *to, RSA *rsa, int padding)
415 {
416 struct cryptoapi_rsa_data *priv =
417 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
418 HCRYPTHASH hash;
419 DWORD hash_size, len, i;
420 unsigned char *buf = NULL;
421 int ret = 0;
422
423 if (priv == NULL) {
424 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
425 ERR_R_PASSED_NULL_PARAMETER);
426 return 0;
427 }
428
429 if (padding != RSA_PKCS1_PADDING) {
430 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
431 RSA_R_UNKNOWN_PADDING_TYPE);
432 return 0;
433 }
434
435 if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
436 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
437 __func__);
438 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
439 RSA_R_INVALID_MESSAGE_LENGTH);
440 return 0;
441 }
442
443 if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
444 {
445 cryptoapi_error("CryptCreateHash failed");
446 return 0;
447 }
448
449 len = sizeof(hash_size);
450 if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
451 0)) {
452 cryptoapi_error("CryptGetHashParam failed");
453 goto err;
454 }
455
456 if ((int) hash_size != flen) {
457 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
458 (unsigned) hash_size, flen);
459 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
460 RSA_R_INVALID_MESSAGE_LENGTH);
461 goto err;
462 }
463 if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
464 cryptoapi_error("CryptSetHashParam failed");
465 goto err;
466 }
467
468 len = RSA_size(rsa);
469 buf = os_malloc(len);
470 if (buf == NULL) {
471 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
472 goto err;
473 }
474
475 if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
476 cryptoapi_error("CryptSignHash failed");
477 goto err;
478 }
479
480 for (i = 0; i < len; i++)
481 to[i] = buf[len - i - 1];
482 ret = len;
483
484 err:
485 os_free(buf);
486 CryptDestroyHash(hash);
487
488 return ret;
489 }
490
491
cryptoapi_rsa_priv_dec(int flen,const unsigned char * from,unsigned char * to,RSA * rsa,int padding)492 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
493 unsigned char *to, RSA *rsa, int padding)
494 {
495 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
496 return 0;
497 }
498
499
cryptoapi_free_data(struct cryptoapi_rsa_data * priv)500 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
501 {
502 if (priv == NULL)
503 return;
504 if (priv->crypt_prov && priv->free_crypt_prov)
505 CryptReleaseContext(priv->crypt_prov, 0);
506 if (priv->cert)
507 CertFreeCertificateContext(priv->cert);
508 os_free(priv);
509 }
510
511
cryptoapi_finish(RSA * rsa)512 static int cryptoapi_finish(RSA *rsa)
513 {
514 cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
515 os_free((void *) rsa->meth);
516 rsa->meth = NULL;
517 return 1;
518 }
519
520
cryptoapi_find_cert(const char * name,DWORD store)521 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
522 {
523 HCERTSTORE cs;
524 const CERT_CONTEXT *ret = NULL;
525
526 cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
527 store | CERT_STORE_OPEN_EXISTING_FLAG |
528 CERT_STORE_READONLY_FLAG, L"MY");
529 if (cs == NULL) {
530 cryptoapi_error("Failed to open 'My system store'");
531 return NULL;
532 }
533
534 if (strncmp(name, "cert://", 7) == 0) {
535 unsigned short wbuf[255];
536 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
537 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
538 PKCS_7_ASN_ENCODING,
539 0, CERT_FIND_SUBJECT_STR,
540 wbuf, NULL);
541 } else if (strncmp(name, "hash://", 7) == 0) {
542 CRYPT_HASH_BLOB blob;
543 int len;
544 const char *hash = name + 7;
545 unsigned char *buf;
546
547 len = os_strlen(hash) / 2;
548 buf = os_malloc(len);
549 if (buf && hexstr2bin(hash, buf, len) == 0) {
550 blob.cbData = len;
551 blob.pbData = buf;
552 ret = CertFindCertificateInStore(cs,
553 X509_ASN_ENCODING |
554 PKCS_7_ASN_ENCODING,
555 0, CERT_FIND_HASH,
556 &blob, NULL);
557 }
558 os_free(buf);
559 }
560
561 CertCloseStore(cs, 0);
562
563 return ret;
564 }
565
566
tls_cryptoapi_cert(SSL * ssl,const char * name)567 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
568 {
569 X509 *cert = NULL;
570 RSA *rsa = NULL, *pub_rsa;
571 struct cryptoapi_rsa_data *priv;
572 RSA_METHOD *rsa_meth;
573
574 if (name == NULL ||
575 (strncmp(name, "cert://", 7) != 0 &&
576 strncmp(name, "hash://", 7) != 0))
577 return -1;
578
579 priv = os_zalloc(sizeof(*priv));
580 rsa_meth = os_zalloc(sizeof(*rsa_meth));
581 if (priv == NULL || rsa_meth == NULL) {
582 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
583 "for CryptoAPI RSA method");
584 os_free(priv);
585 os_free(rsa_meth);
586 return -1;
587 }
588
589 priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
590 if (priv->cert == NULL) {
591 priv->cert = cryptoapi_find_cert(
592 name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
593 }
594 if (priv->cert == NULL) {
595 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
596 "'%s'", name);
597 goto err;
598 }
599
600 cert = d2i_X509(NULL,
601 (const unsigned char **) &priv->cert->pbCertEncoded,
602 priv->cert->cbCertEncoded);
603 if (cert == NULL) {
604 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
605 "encoding");
606 goto err;
607 }
608
609 if (!CryptAcquireCertificatePrivateKey(priv->cert,
610 CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
611 NULL, &priv->crypt_prov,
612 &priv->key_spec,
613 &priv->free_crypt_prov)) {
614 cryptoapi_error("Failed to acquire a private key for the "
615 "certificate");
616 goto err;
617 }
618
619 rsa_meth->name = "Microsoft CryptoAPI RSA Method";
620 rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
621 rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
622 rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
623 rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
624 rsa_meth->finish = cryptoapi_finish;
625 rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
626 rsa_meth->app_data = (char *) priv;
627
628 rsa = RSA_new();
629 if (rsa == NULL) {
630 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
631 ERR_R_MALLOC_FAILURE);
632 goto err;
633 }
634
635 if (!SSL_use_certificate(ssl, cert)) {
636 RSA_free(rsa);
637 rsa = NULL;
638 goto err;
639 }
640 pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
641 X509_free(cert);
642 cert = NULL;
643
644 rsa->n = BN_dup(pub_rsa->n);
645 rsa->e = BN_dup(pub_rsa->e);
646 if (!RSA_set_method(rsa, rsa_meth))
647 goto err;
648
649 if (!SSL_use_RSAPrivateKey(ssl, rsa))
650 goto err;
651 RSA_free(rsa);
652
653 return 0;
654
655 err:
656 if (cert)
657 X509_free(cert);
658 if (rsa)
659 RSA_free(rsa);
660 else {
661 os_free(rsa_meth);
662 cryptoapi_free_data(priv);
663 }
664 return -1;
665 }
666
667
tls_cryptoapi_ca_cert(SSL_CTX * ssl_ctx,SSL * ssl,const char * name)668 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
669 {
670 HCERTSTORE cs;
671 PCCERT_CONTEXT ctx = NULL;
672 X509 *cert;
673 char buf[128];
674 const char *store;
675 #ifdef UNICODE
676 WCHAR *wstore;
677 #endif /* UNICODE */
678
679 if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
680 return -1;
681
682 store = name + 13;
683 #ifdef UNICODE
684 wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
685 if (wstore == NULL)
686 return -1;
687 wsprintf(wstore, L"%S", store);
688 cs = CertOpenSystemStore(0, wstore);
689 os_free(wstore);
690 #else /* UNICODE */
691 cs = CertOpenSystemStore(0, store);
692 #endif /* UNICODE */
693 if (cs == NULL) {
694 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
695 "'%s': error=%d", __func__, store,
696 (int) GetLastError());
697 return -1;
698 }
699
700 while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
701 cert = d2i_X509(NULL,
702 (const unsigned char **) &ctx->pbCertEncoded,
703 ctx->cbCertEncoded);
704 if (cert == NULL) {
705 wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
706 "X509 DER encoding for CA cert");
707 continue;
708 }
709
710 X509_NAME_oneline(X509_get_subject_name(cert), buf,
711 sizeof(buf));
712 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
713 "system certificate store: subject='%s'", buf);
714
715 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
716 cert)) {
717 tls_show_errors(MSG_WARNING, __func__,
718 "Failed to add ca_cert to OpenSSL "
719 "certificate store");
720 }
721
722 X509_free(cert);
723 }
724
725 if (!CertCloseStore(cs, 0)) {
726 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
727 "'%s': error=%d", __func__, name + 13,
728 (int) GetLastError());
729 }
730
731 return 0;
732 }
733
734
735 #else /* CONFIG_NATIVE_WINDOWS */
736
tls_cryptoapi_cert(SSL * ssl,const char * name)737 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
738 {
739 return -1;
740 }
741
742 #endif /* CONFIG_NATIVE_WINDOWS */
743
744
ssl_info_cb(const SSL * ssl,int where,int ret)745 static void ssl_info_cb(const SSL *ssl, int where, int ret)
746 {
747 const char *str;
748 int w;
749
750 wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
751 w = where & ~SSL_ST_MASK;
752 if (w & SSL_ST_CONNECT)
753 str = "SSL_connect";
754 else if (w & SSL_ST_ACCEPT)
755 str = "SSL_accept";
756 else
757 str = "undefined";
758
759 if (where & SSL_CB_LOOP) {
760 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
761 str, SSL_state_string_long(ssl));
762 } else if (where & SSL_CB_ALERT) {
763 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
764 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
765 where & SSL_CB_READ ?
766 "read (remote end reported an error)" :
767 "write (local SSL3 detected an error)",
768 SSL_alert_type_string_long(ret),
769 SSL_alert_desc_string_long(ret));
770 if ((ret >> 8) == SSL3_AL_FATAL) {
771 if (where & SSL_CB_READ)
772 conn->read_alerts++;
773 else
774 conn->write_alerts++;
775 }
776 if (conn->context->event_cb != NULL) {
777 union tls_event_data ev;
778 struct tls_context *context = conn->context;
779 os_memset(&ev, 0, sizeof(ev));
780 ev.alert.is_local = !(where & SSL_CB_READ);
781 ev.alert.type = SSL_alert_type_string_long(ret);
782 ev.alert.description = SSL_alert_desc_string_long(ret);
783 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
784 }
785 } else if (where & SSL_CB_EXIT && ret <= 0) {
786 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
787 str, ret == 0 ? "failed" : "error",
788 SSL_state_string_long(ssl));
789 }
790 }
791
792
793 #ifndef OPENSSL_NO_ENGINE
794 /**
795 * tls_engine_load_dynamic_generic - load any openssl engine
796 * @pre: an array of commands and values that load an engine initialized
797 * in the engine specific function
798 * @post: an array of commands and values that initialize an already loaded
799 * engine (or %NULL if not required)
800 * @id: the engine id of the engine to load (only required if post is not %NULL
801 *
802 * This function is a generic function that loads any openssl engine.
803 *
804 * Returns: 0 on success, -1 on failure
805 */
tls_engine_load_dynamic_generic(const char * pre[],const char * post[],const char * id)806 static int tls_engine_load_dynamic_generic(const char *pre[],
807 const char *post[], const char *id)
808 {
809 ENGINE *engine;
810 const char *dynamic_id = "dynamic";
811
812 engine = ENGINE_by_id(id);
813 if (engine) {
814 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
815 "available", id);
816 /*
817 * If it was auto-loaded by ENGINE_by_id() we might still
818 * need to tell it which PKCS#11 module to use in legacy
819 * (non-p11-kit) environments. Do so now; even if it was
820 * properly initialised before, setting it again will be
821 * harmless.
822 */
823 goto found;
824 }
825 ERR_clear_error();
826
827 engine = ENGINE_by_id(dynamic_id);
828 if (engine == NULL) {
829 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
830 dynamic_id,
831 ERR_error_string(ERR_get_error(), NULL));
832 return -1;
833 }
834
835 /* Perform the pre commands. This will load the engine. */
836 while (pre && pre[0]) {
837 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
838 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
839 wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
840 "%s %s [%s]", pre[0], pre[1],
841 ERR_error_string(ERR_get_error(), NULL));
842 ENGINE_free(engine);
843 return -1;
844 }
845 pre += 2;
846 }
847
848 /*
849 * Free the reference to the "dynamic" engine. The loaded engine can
850 * now be looked up using ENGINE_by_id().
851 */
852 ENGINE_free(engine);
853
854 engine = ENGINE_by_id(id);
855 if (engine == NULL) {
856 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
857 id, ERR_error_string(ERR_get_error(), NULL));
858 return -1;
859 }
860 found:
861 while (post && post[0]) {
862 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
863 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
864 wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
865 " %s %s [%s]", post[0], post[1],
866 ERR_error_string(ERR_get_error(), NULL));
867 ENGINE_remove(engine);
868 ENGINE_free(engine);
869 return -1;
870 }
871 post += 2;
872 }
873 ENGINE_free(engine);
874
875 return 0;
876 }
877
878
879 /**
880 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
881 * @pkcs11_so_path: pksc11_so_path from the configuration
882 * @pcks11_module_path: pkcs11_module_path from the configuration
883 */
tls_engine_load_dynamic_pkcs11(const char * pkcs11_so_path,const char * pkcs11_module_path)884 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
885 const char *pkcs11_module_path)
886 {
887 char *engine_id = "pkcs11";
888 const char *pre_cmd[] = {
889 "SO_PATH", NULL /* pkcs11_so_path */,
890 "ID", NULL /* engine_id */,
891 "LIST_ADD", "1",
892 /* "NO_VCHECK", "1", */
893 "LOAD", NULL,
894 NULL, NULL
895 };
896 const char *post_cmd[] = {
897 "MODULE_PATH", NULL /* pkcs11_module_path */,
898 NULL, NULL
899 };
900
901 if (!pkcs11_so_path)
902 return 0;
903
904 pre_cmd[1] = pkcs11_so_path;
905 pre_cmd[3] = engine_id;
906 if (pkcs11_module_path)
907 post_cmd[1] = pkcs11_module_path;
908 else
909 post_cmd[0] = NULL;
910
911 wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
912 pkcs11_so_path);
913
914 return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
915 }
916
917
918 /**
919 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
920 * @opensc_so_path: opensc_so_path from the configuration
921 */
tls_engine_load_dynamic_opensc(const char * opensc_so_path)922 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
923 {
924 char *engine_id = "opensc";
925 const char *pre_cmd[] = {
926 "SO_PATH", NULL /* opensc_so_path */,
927 "ID", NULL /* engine_id */,
928 "LIST_ADD", "1",
929 "LOAD", NULL,
930 NULL, NULL
931 };
932
933 if (!opensc_so_path)
934 return 0;
935
936 pre_cmd[1] = opensc_so_path;
937 pre_cmd[3] = engine_id;
938
939 wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
940 opensc_so_path);
941
942 return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
943 }
944 #endif /* OPENSSL_NO_ENGINE */
945
946
remove_session_cb(SSL_CTX * ctx,SSL_SESSION * sess)947 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
948 {
949 struct wpabuf *buf;
950
951 if (tls_ex_idx_session < 0)
952 return;
953 buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
954 if (!buf)
955 return;
956 wpa_printf(MSG_DEBUG,
957 "OpenSSL: Free application session data %p (sess %p)",
958 buf, sess);
959 wpabuf_free(buf);
960
961 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
962 }
963
964
tls_init(const struct tls_config * conf)965 void * tls_init(const struct tls_config *conf)
966 {
967 struct tls_data *data;
968 SSL_CTX *ssl;
969 struct tls_context *context;
970 const char *ciphers;
971
972 if (tls_openssl_ref_count == 0) {
973 tls_global = context = tls_context_new(conf);
974 if (context == NULL)
975 return NULL;
976 #ifdef CONFIG_FIPS
977 #ifdef OPENSSL_FIPS
978 if (conf && conf->fips_mode) {
979 static int fips_enabled = 0;
980
981 if (!fips_enabled && !FIPS_mode_set(1)) {
982 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
983 "mode");
984 ERR_load_crypto_strings();
985 ERR_print_errors_fp(stderr);
986 os_free(tls_global);
987 tls_global = NULL;
988 return NULL;
989 } else {
990 wpa_printf(MSG_INFO, "Running in FIPS mode");
991 fips_enabled = 1;
992 }
993 }
994 #else /* OPENSSL_FIPS */
995 if (conf && conf->fips_mode) {
996 wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
997 "supported");
998 os_free(tls_global);
999 tls_global = NULL;
1000 return NULL;
1001 }
1002 #endif /* OPENSSL_FIPS */
1003 #endif /* CONFIG_FIPS */
1004 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
1005 (defined(LIBRESSL_VERSION_NUMBER) && \
1006 LIBRESSL_VERSION_NUMBER < 0x20700000L)
1007 SSL_load_error_strings();
1008 SSL_library_init();
1009 #ifndef OPENSSL_NO_SHA256
1010 EVP_add_digest(EVP_sha256());
1011 #endif /* OPENSSL_NO_SHA256 */
1012 /* TODO: if /dev/urandom is available, PRNG is seeded
1013 * automatically. If this is not the case, random data should
1014 * be added here. */
1015
1016 #ifdef PKCS12_FUNCS
1017 #ifndef OPENSSL_NO_RC2
1018 /*
1019 * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
1020 * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
1021 * versions, but it looks like OpenSSL 1.0.0 does not do that
1022 * anymore.
1023 */
1024 EVP_add_cipher(EVP_rc2_40_cbc());
1025 #endif /* OPENSSL_NO_RC2 */
1026 PKCS12_PBE_add();
1027 #endif /* PKCS12_FUNCS */
1028 #endif /* < 1.1.0 */
1029 } else {
1030 context = tls_context_new(conf);
1031 if (context == NULL)
1032 return NULL;
1033 }
1034 tls_openssl_ref_count++;
1035
1036 data = os_zalloc(sizeof(*data));
1037 if (data)
1038 ssl = SSL_CTX_new(SSLv23_method());
1039 else
1040 ssl = NULL;
1041 if (ssl == NULL) {
1042 tls_openssl_ref_count--;
1043 if (context != tls_global)
1044 os_free(context);
1045 if (tls_openssl_ref_count == 0) {
1046 os_free(tls_global);
1047 tls_global = NULL;
1048 }
1049 os_free(data);
1050 return NULL;
1051 }
1052 data->ssl = ssl;
1053 if (conf) {
1054 data->tls_session_lifetime = conf->tls_session_lifetime;
1055 data->crl_reload_interval = conf->crl_reload_interval;
1056 }
1057
1058 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
1059 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
1060
1061 #ifdef SSL_MODE_NO_AUTO_CHAIN
1062 /* Number of deployed use cases assume the default OpenSSL behavior of
1063 * auto chaining the local certificate is in use. BoringSSL removed this
1064 * functionality by default, so we need to restore it here to avoid
1065 * breaking existing use cases. */
1066 SSL_CTX_clear_mode(ssl, SSL_MODE_NO_AUTO_CHAIN);
1067 #endif /* SSL_MODE_NO_AUTO_CHAIN */
1068
1069 SSL_CTX_set_info_callback(ssl, ssl_info_cb);
1070 SSL_CTX_set_app_data(ssl, context);
1071 if (data->tls_session_lifetime > 0) {
1072 SSL_CTX_set_quiet_shutdown(ssl, 1);
1073 /*
1074 * Set default context here. In practice, this will be replaced
1075 * by the per-EAP method context in tls_connection_set_verify().
1076 */
1077 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
1078 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
1079 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
1080 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
1081 } else {
1082 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
1083 }
1084
1085 if (tls_ex_idx_session < 0) {
1086 tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
1087 0, NULL, NULL, NULL, NULL);
1088 if (tls_ex_idx_session < 0) {
1089 tls_deinit(data);
1090 return NULL;
1091 }
1092 }
1093
1094 #ifndef OPENSSL_NO_ENGINE
1095 wpa_printf(MSG_DEBUG, "ENGINE: Loading builtin engines");
1096 ENGINE_load_builtin_engines();
1097
1098 if (conf &&
1099 (conf->opensc_engine_path || conf->pkcs11_engine_path ||
1100 conf->pkcs11_module_path)) {
1101 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
1102 tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
1103 conf->pkcs11_module_path)) {
1104 tls_deinit(data);
1105 return NULL;
1106 }
1107 }
1108 #endif /* OPENSSL_NO_ENGINE */
1109
1110 if (conf && conf->openssl_ciphers)
1111 ciphers = conf->openssl_ciphers;
1112 else
1113 ciphers = TLS_DEFAULT_CIPHERS;
1114 if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
1115 wpa_printf(MSG_ERROR,
1116 "OpenSSL: Failed to set cipher string '%s'",
1117 ciphers);
1118 tls_deinit(data);
1119 return NULL;
1120 }
1121
1122 return data;
1123 }
1124
1125
tls_deinit(void * ssl_ctx)1126 void tls_deinit(void *ssl_ctx)
1127 {
1128 struct tls_data *data = ssl_ctx;
1129 SSL_CTX *ssl = data->ssl;
1130 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1131 if (context != tls_global)
1132 os_free(context);
1133 if (data->tls_session_lifetime > 0)
1134 SSL_CTX_flush_sessions(ssl, 0);
1135 os_free(data->ca_cert);
1136 SSL_CTX_free(ssl);
1137
1138 tls_openssl_ref_count--;
1139 if (tls_openssl_ref_count == 0) {
1140 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
1141 (defined(LIBRESSL_VERSION_NUMBER) && \
1142 LIBRESSL_VERSION_NUMBER < 0x20700000L)
1143 #ifndef OPENSSL_NO_ENGINE
1144 ENGINE_cleanup();
1145 #endif /* OPENSSL_NO_ENGINE */
1146 CRYPTO_cleanup_all_ex_data();
1147 ERR_remove_thread_state(NULL);
1148 ERR_free_strings();
1149 EVP_cleanup();
1150 #endif /* < 1.1.0 */
1151 os_free(tls_global->ocsp_stapling_response);
1152 tls_global->ocsp_stapling_response = NULL;
1153 os_free(tls_global);
1154 tls_global = NULL;
1155 }
1156
1157 os_free(data->check_cert_subject);
1158 os_free(data);
1159 }
1160
1161
1162 #ifndef OPENSSL_NO_ENGINE
1163
1164 /* Cryptoki return values */
1165 #define CKR_PIN_INCORRECT 0x000000a0
1166 #define CKR_PIN_INVALID 0x000000a1
1167 #define CKR_PIN_LEN_RANGE 0x000000a2
1168
1169 /* libp11 */
1170 #define ERR_LIB_PKCS11 ERR_LIB_USER
1171
tls_is_pin_error(unsigned int err)1172 static int tls_is_pin_error(unsigned int err)
1173 {
1174 return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
1175 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
1176 ERR_GET_REASON(err) == CKR_PIN_INVALID ||
1177 ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
1178 }
1179
1180 #endif /* OPENSSL_NO_ENGINE */
1181
1182
1183 #ifdef ANDROID
1184 /* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */
1185 EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id);
1186 #endif /* ANDROID */
1187
tls_engine_init(struct tls_connection * conn,const char * engine_id,const char * pin,const char * key_id,const char * cert_id,const char * ca_cert_id)1188 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
1189 const char *pin, const char *key_id,
1190 const char *cert_id, const char *ca_cert_id)
1191 {
1192 #if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL)
1193 #if !defined(OPENSSL_NO_ENGINE)
1194 #error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL."
1195 #endif
1196 if (!key_id)
1197 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1198 conn->engine = NULL;
1199 conn->private_key = EVP_PKEY_from_keystore(key_id);
1200 if (!conn->private_key) {
1201 wpa_printf(MSG_ERROR,
1202 "ENGINE: cannot load private key with id '%s' [%s]",
1203 key_id,
1204 ERR_error_string(ERR_get_error(), NULL));
1205 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1206 }
1207 #endif /* ANDROID && OPENSSL_IS_BORINGSSL */
1208
1209 #ifndef OPENSSL_NO_ENGINE
1210 int ret = -1;
1211 if (engine_id == NULL) {
1212 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
1213 return -1;
1214 }
1215
1216 ERR_clear_error();
1217 #ifdef ANDROID
1218 ENGINE_load_dynamic();
1219 #endif
1220 conn->engine = ENGINE_by_id(engine_id);
1221 if (!conn->engine) {
1222 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
1223 engine_id, ERR_error_string(ERR_get_error(), NULL));
1224 goto err;
1225 }
1226 if (ENGINE_init(conn->engine) != 1) {
1227 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
1228 "(engine: %s) [%s]", engine_id,
1229 ERR_error_string(ERR_get_error(), NULL));
1230 goto err;
1231 }
1232 wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
1233
1234 #ifndef ANDROID
1235 if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
1236 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
1237 ERR_error_string(ERR_get_error(), NULL));
1238 goto err;
1239 }
1240 #endif
1241 if (key_id) {
1242 /*
1243 * Ensure that the ENGINE does not attempt to use the OpenSSL
1244 * UI system to obtain a PIN, if we didn't provide one.
1245 */
1246 struct {
1247 const void *password;
1248 const char *prompt_info;
1249 } key_cb = { "", NULL };
1250
1251 /* load private key first in-case PIN is required for cert */
1252 conn->private_key = ENGINE_load_private_key(conn->engine,
1253 key_id, NULL,
1254 &key_cb);
1255 if (!conn->private_key) {
1256 unsigned long err = ERR_get_error();
1257
1258 wpa_printf(MSG_ERROR,
1259 "ENGINE: cannot load private key with id '%s' [%s]",
1260 key_id,
1261 ERR_error_string(err, NULL));
1262 if (tls_is_pin_error(err))
1263 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
1264 else
1265 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1266 goto err;
1267 }
1268 }
1269
1270 /* handle a certificate and/or CA certificate */
1271 if (cert_id || ca_cert_id) {
1272 const char *cmd_name = "LOAD_CERT_CTRL";
1273
1274 /* test if the engine supports a LOAD_CERT_CTRL */
1275 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
1276 0, (void *)cmd_name, NULL)) {
1277 wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
1278 " loading certificates");
1279 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1280 goto err;
1281 }
1282 }
1283
1284 return 0;
1285
1286 err:
1287 if (conn->engine) {
1288 ENGINE_free(conn->engine);
1289 conn->engine = NULL;
1290 }
1291
1292 if (conn->private_key) {
1293 EVP_PKEY_free(conn->private_key);
1294 conn->private_key = NULL;
1295 }
1296
1297 return ret;
1298 #else /* OPENSSL_NO_ENGINE */
1299 return 0;
1300 #endif /* OPENSSL_NO_ENGINE */
1301 }
1302
1303
tls_engine_deinit(struct tls_connection * conn)1304 static void tls_engine_deinit(struct tls_connection *conn)
1305 {
1306 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
1307 wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
1308 if (conn->private_key) {
1309 EVP_PKEY_free(conn->private_key);
1310 conn->private_key = NULL;
1311 }
1312 if (conn->engine) {
1313 #if !defined(OPENSSL_IS_BORINGSSL)
1314 ENGINE_finish(conn->engine);
1315 #endif /* !OPENSSL_IS_BORINGSSL */
1316 conn->engine = NULL;
1317 }
1318 #endif /* ANDROID || !OPENSSL_NO_ENGINE */
1319 }
1320
1321
tls_get_errors(void * ssl_ctx)1322 int tls_get_errors(void *ssl_ctx)
1323 {
1324 int count = 0;
1325 unsigned long err;
1326
1327 while ((err = ERR_get_error())) {
1328 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1329 ERR_error_string(err, NULL));
1330 count++;
1331 }
1332
1333 return count;
1334 }
1335
1336
openssl_content_type(int content_type)1337 static const char * openssl_content_type(int content_type)
1338 {
1339 switch (content_type) {
1340 case 20:
1341 return "change cipher spec";
1342 case 21:
1343 return "alert";
1344 case 22:
1345 return "handshake";
1346 case 23:
1347 return "application data";
1348 case 24:
1349 return "heartbeat";
1350 case 256:
1351 return "TLS header info"; /* pseudo content type */
1352 case 257:
1353 return "inner content type"; /* pseudo content type */
1354 default:
1355 return "?";
1356 }
1357 }
1358
1359
openssl_handshake_type(int content_type,const u8 * buf,size_t len)1360 static const char * openssl_handshake_type(int content_type, const u8 *buf,
1361 size_t len)
1362 {
1363 if (content_type == 257 && buf && len == 1)
1364 return openssl_content_type(buf[0]);
1365 if (content_type != 22 || !buf || len == 0)
1366 return "";
1367 switch (buf[0]) {
1368 case 0:
1369 return "hello request";
1370 case 1:
1371 return "client hello";
1372 case 2:
1373 return "server hello";
1374 case 3:
1375 return "hello verify request";
1376 case 4:
1377 return "new session ticket";
1378 case 5:
1379 return "end of early data";
1380 case 6:
1381 return "hello retry request";
1382 case 8:
1383 return "encrypted extensions";
1384 case 11:
1385 return "certificate";
1386 case 12:
1387 return "server key exchange";
1388 case 13:
1389 return "certificate request";
1390 case 14:
1391 return "server hello done";
1392 case 15:
1393 return "certificate verify";
1394 case 16:
1395 return "client key exchange";
1396 case 20:
1397 return "finished";
1398 case 21:
1399 return "certificate url";
1400 case 22:
1401 return "certificate status";
1402 case 23:
1403 return "supplemental data";
1404 case 24:
1405 return "key update";
1406 case 254:
1407 return "message hash";
1408 default:
1409 return "?";
1410 }
1411 }
1412
1413
1414 #ifdef CONFIG_SUITEB
1415
check_server_hello(struct tls_connection * conn,const u8 * pos,const u8 * end)1416 static void check_server_hello(struct tls_connection *conn,
1417 const u8 *pos, const u8 *end)
1418 {
1419 size_t payload_len, id_len;
1420
1421 /*
1422 * Parse ServerHello to get the selected cipher suite since OpenSSL does
1423 * not make it cleanly available during handshake and we need to know
1424 * whether DHE was selected.
1425 */
1426
1427 if (end - pos < 3)
1428 return;
1429 payload_len = WPA_GET_BE24(pos);
1430 pos += 3;
1431
1432 if ((size_t) (end - pos) < payload_len)
1433 return;
1434 end = pos + payload_len;
1435
1436 /* Skip Version and Random */
1437 if (end - pos < 2 + SSL3_RANDOM_SIZE)
1438 return;
1439 pos += 2 + SSL3_RANDOM_SIZE;
1440
1441 /* Skip Session ID */
1442 if (end - pos < 1)
1443 return;
1444 id_len = *pos++;
1445 if ((size_t) (end - pos) < id_len)
1446 return;
1447 pos += id_len;
1448
1449 if (end - pos < 2)
1450 return;
1451 conn->cipher_suite = WPA_GET_BE16(pos);
1452 wpa_printf(MSG_DEBUG, "OpenSSL: Server selected cipher suite 0x%x",
1453 conn->cipher_suite);
1454 }
1455
1456
check_server_key_exchange(SSL * ssl,struct tls_connection * conn,const u8 * pos,const u8 * end)1457 static void check_server_key_exchange(SSL *ssl, struct tls_connection *conn,
1458 const u8 *pos, const u8 *end)
1459 {
1460 size_t payload_len;
1461 u16 dh_len;
1462 BIGNUM *p;
1463 int bits;
1464
1465 if (!(conn->flags & TLS_CONN_SUITEB))
1466 return;
1467
1468 /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
1469 if (conn->cipher_suite != 0x9f)
1470 return;
1471
1472 if (end - pos < 3)
1473 return;
1474 payload_len = WPA_GET_BE24(pos);
1475 pos += 3;
1476
1477 if ((size_t) (end - pos) < payload_len)
1478 return;
1479 end = pos + payload_len;
1480
1481 if (end - pos < 2)
1482 return;
1483 dh_len = WPA_GET_BE16(pos);
1484 pos += 2;
1485
1486 if ((size_t) (end - pos) < dh_len)
1487 return;
1488 p = BN_bin2bn(pos, dh_len, NULL);
1489 if (!p)
1490 return;
1491
1492 bits = BN_num_bits(p);
1493 BN_free(p);
1494
1495 conn->server_dh_prime_len = bits;
1496 wpa_printf(MSG_DEBUG, "OpenSSL: Server DH prime length: %d bits",
1497 conn->server_dh_prime_len);
1498 }
1499
1500 #endif /* CONFIG_SUITEB */
1501
1502
tls_msg_cb(int write_p,int version,int content_type,const void * buf,size_t len,SSL * ssl,void * arg)1503 static void tls_msg_cb(int write_p, int version, int content_type,
1504 const void *buf, size_t len, SSL *ssl, void *arg)
1505 {
1506 struct tls_connection *conn = arg;
1507 const u8 *pos = buf;
1508
1509 if (write_p == 2) {
1510 wpa_printf(MSG_DEBUG,
1511 "OpenSSL: session ver=0x%x content_type=%d",
1512 version, content_type);
1513 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len);
1514 return;
1515 }
1516
1517 wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)",
1518 write_p ? "TX" : "RX", version, content_type,
1519 openssl_content_type(content_type),
1520 openssl_handshake_type(content_type, buf, len));
1521 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1522 if (content_type == 24 && len >= 3 && pos[0] == 1) {
1523 size_t payload_len = WPA_GET_BE16(pos + 1);
1524 if (payload_len + 3 > len) {
1525 wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1526 conn->invalid_hb_used = 1;
1527 }
1528 }
1529
1530 #ifdef CONFIG_SUITEB
1531 /*
1532 * Need to parse these handshake messages to be able to check DH prime
1533 * length since OpenSSL does not expose the new cipher suite and DH
1534 * parameters during handshake (e.g., for cert_cb() callback).
1535 */
1536 if (content_type == 22 && pos && len > 0 && pos[0] == 2)
1537 check_server_hello(conn, pos + 1, pos + len);
1538 if (content_type == 22 && pos && len > 0 && pos[0] == 12)
1539 check_server_key_exchange(ssl, conn, pos + 1, pos + len);
1540 #endif /* CONFIG_SUITEB */
1541 }
1542
1543
tls_connection_init(void * ssl_ctx)1544 struct tls_connection * tls_connection_init(void *ssl_ctx)
1545 {
1546 struct tls_data *data = ssl_ctx;
1547 SSL_CTX *ssl = data->ssl;
1548 struct tls_connection *conn;
1549 long options;
1550 X509_STORE *new_cert_store;
1551 struct os_reltime now;
1552 struct tls_context *context = SSL_CTX_get_app_data(ssl);
1553
1554 /* Replace X509 store if it is time to update CRL. */
1555 if (data->crl_reload_interval > 0 && os_get_reltime(&now) == 0 &&
1556 os_reltime_expired(&now, &data->crl_last_reload,
1557 data->crl_reload_interval)) {
1558 wpa_printf(MSG_INFO,
1559 "OpenSSL: Flushing X509 store with ca_cert file");
1560 new_cert_store = tls_crl_cert_reload(data->ca_cert,
1561 data->check_crl);
1562 if (!new_cert_store) {
1563 wpa_printf(MSG_ERROR,
1564 "OpenSSL: Error replacing X509 store with ca_cert file");
1565 } else {
1566 /* Replace old store */
1567 SSL_CTX_set_cert_store(ssl, new_cert_store);
1568 data->crl_last_reload = now;
1569 }
1570 }
1571
1572 conn = os_zalloc(sizeof(*conn));
1573 if (conn == NULL)
1574 return NULL;
1575 conn->data = data;
1576 conn->ssl_ctx = ssl;
1577 conn->ssl = SSL_new(ssl);
1578 if (conn->ssl == NULL) {
1579 tls_show_errors(MSG_INFO, __func__,
1580 "Failed to initialize new SSL connection");
1581 os_free(conn);
1582 return NULL;
1583 }
1584
1585 conn->context = context;
1586 SSL_set_app_data(conn->ssl, conn);
1587 SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1588 SSL_set_msg_callback_arg(conn->ssl, conn);
1589 options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1590 SSL_OP_SINGLE_DH_USE;
1591 #ifdef SSL_OP_NO_COMPRESSION
1592 options |= SSL_OP_NO_COMPRESSION;
1593 #endif /* SSL_OP_NO_COMPRESSION */
1594 SSL_set_options(conn->ssl, options);
1595 #ifdef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
1596 /* Hopefully there is no need for middlebox compatibility mechanisms
1597 * when going through EAP authentication. */
1598 SSL_clear_options(conn->ssl, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
1599 #endif
1600
1601 conn->ssl_in = BIO_new(BIO_s_mem());
1602 if (!conn->ssl_in) {
1603 tls_show_errors(MSG_INFO, __func__,
1604 "Failed to create a new BIO for ssl_in");
1605 SSL_free(conn->ssl);
1606 os_free(conn);
1607 return NULL;
1608 }
1609
1610 conn->ssl_out = BIO_new(BIO_s_mem());
1611 if (!conn->ssl_out) {
1612 tls_show_errors(MSG_INFO, __func__,
1613 "Failed to create a new BIO for ssl_out");
1614 SSL_free(conn->ssl);
1615 BIO_free(conn->ssl_in);
1616 os_free(conn);
1617 return NULL;
1618 }
1619
1620 SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1621
1622 return conn;
1623 }
1624
1625
tls_connection_deinit(void * ssl_ctx,struct tls_connection * conn)1626 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1627 {
1628 if (conn == NULL)
1629 return;
1630 if (conn->success_data) {
1631 /*
1632 * Make sure ssl_clear_bad_session() does not remove this
1633 * session.
1634 */
1635 SSL_set_quiet_shutdown(conn->ssl, 1);
1636 SSL_shutdown(conn->ssl);
1637 }
1638 SSL_free(conn->ssl);
1639 tls_engine_deinit(conn);
1640 os_free(conn->subject_match);
1641 os_free(conn->altsubject_match);
1642 os_free(conn->suffix_match);
1643 os_free(conn->domain_match);
1644 os_free(conn->check_cert_subject);
1645 os_free(conn->session_ticket);
1646 os_free(conn);
1647 }
1648
1649
tls_connection_established(void * ssl_ctx,struct tls_connection * conn)1650 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1651 {
1652 return conn ? SSL_is_init_finished(conn->ssl) : 0;
1653 }
1654
1655
tls_connection_peer_serial_num(void * tls_ctx,struct tls_connection * conn)1656 char * tls_connection_peer_serial_num(void *tls_ctx,
1657 struct tls_connection *conn)
1658 {
1659 ASN1_INTEGER *ser;
1660 char *serial_num;
1661 size_t len;
1662
1663 if (!conn->peer_cert)
1664 return NULL;
1665
1666 ser = X509_get_serialNumber(conn->peer_cert);
1667 if (!ser)
1668 return NULL;
1669
1670 len = ASN1_STRING_length(ser) * 2 + 1;
1671 serial_num = os_malloc(len);
1672 if (!serial_num)
1673 return NULL;
1674 wpa_snprintf_hex_uppercase(serial_num, len,
1675 ASN1_STRING_get0_data(ser),
1676 ASN1_STRING_length(ser));
1677 return serial_num;
1678 }
1679
1680
tls_connection_shutdown(void * ssl_ctx,struct tls_connection * conn)1681 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1682 {
1683 if (conn == NULL)
1684 return -1;
1685
1686 /* Shutdown previous TLS connection without notifying the peer
1687 * because the connection was already terminated in practice
1688 * and "close notify" shutdown alert would confuse AS. */
1689 SSL_set_quiet_shutdown(conn->ssl, 1);
1690 SSL_shutdown(conn->ssl);
1691 return SSL_clear(conn->ssl) == 1 ? 0 : -1;
1692 }
1693
1694
tls_match_altsubject_component(X509 * cert,int type,const char * value,size_t len)1695 static int tls_match_altsubject_component(X509 *cert, int type,
1696 const char *value, size_t len)
1697 {
1698 GENERAL_NAME *gen;
1699 void *ext;
1700 int found = 0;
1701 stack_index_t i;
1702
1703 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1704
1705 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1706 gen = sk_GENERAL_NAME_value(ext, i);
1707 if (gen->type != type)
1708 continue;
1709 if (os_strlen((char *) gen->d.ia5->data) == len &&
1710 os_memcmp(value, gen->d.ia5->data, len) == 0)
1711 found++;
1712 }
1713
1714 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1715
1716 return found;
1717 }
1718
1719
tls_match_altsubject(X509 * cert,const char * match)1720 static int tls_match_altsubject(X509 *cert, const char *match)
1721 {
1722 int type;
1723 const char *pos, *end;
1724 size_t len;
1725
1726 pos = match;
1727 do {
1728 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1729 type = GEN_EMAIL;
1730 pos += 6;
1731 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1732 type = GEN_DNS;
1733 pos += 4;
1734 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1735 type = GEN_URI;
1736 pos += 4;
1737 } else {
1738 wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1739 "match '%s'", pos);
1740 return 0;
1741 }
1742 end = os_strchr(pos, ';');
1743 while (end) {
1744 if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1745 os_strncmp(end + 1, "DNS:", 4) == 0 ||
1746 os_strncmp(end + 1, "URI:", 4) == 0)
1747 break;
1748 end = os_strchr(end + 1, ';');
1749 }
1750 if (end)
1751 len = end - pos;
1752 else
1753 len = os_strlen(pos);
1754 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1755 return 1;
1756 pos = end + 1;
1757 } while (end);
1758
1759 return 0;
1760 }
1761
1762
1763 #ifndef CONFIG_NATIVE_WINDOWS
domain_suffix_match(const u8 * val,size_t len,const char * match,size_t match_len,int full)1764 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1765 size_t match_len, int full)
1766 {
1767 size_t i;
1768
1769 /* Check for embedded nuls that could mess up suffix matching */
1770 for (i = 0; i < len; i++) {
1771 if (val[i] == '\0') {
1772 wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1773 return 0;
1774 }
1775 }
1776
1777 if (match_len > len || (full && match_len != len))
1778 return 0;
1779
1780 if (os_strncasecmp((const char *) val + len - match_len, match,
1781 match_len) != 0)
1782 return 0; /* no match */
1783
1784 if (match_len == len)
1785 return 1; /* exact match */
1786
1787 if (val[len - match_len - 1] == '.')
1788 return 1; /* full label match completes suffix match */
1789
1790 wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1791 return 0;
1792 }
1793 #endif /* CONFIG_NATIVE_WINDOWS */
1794
1795
1796 struct tls_dn_field_order_cnt {
1797 u8 cn;
1798 u8 c;
1799 u8 l;
1800 u8 st;
1801 u8 o;
1802 u8 ou;
1803 u8 email;
1804 };
1805
1806
get_dn_field_index(const struct tls_dn_field_order_cnt * dn_cnt,int nid)1807 static int get_dn_field_index(const struct tls_dn_field_order_cnt *dn_cnt,
1808 int nid)
1809 {
1810 switch (nid) {
1811 case NID_commonName:
1812 return dn_cnt->cn;
1813 case NID_countryName:
1814 return dn_cnt->c;
1815 case NID_localityName:
1816 return dn_cnt->l;
1817 case NID_stateOrProvinceName:
1818 return dn_cnt->st;
1819 case NID_organizationName:
1820 return dn_cnt->o;
1821 case NID_organizationalUnitName:
1822 return dn_cnt->ou;
1823 case NID_pkcs9_emailAddress:
1824 return dn_cnt->email;
1825 default:
1826 wpa_printf(MSG_ERROR,
1827 "TLS: Unknown NID '%d' in check_cert_subject",
1828 nid);
1829 return -1;
1830 }
1831 }
1832
1833
1834 /**
1835 * match_dn_field - Match configuration DN field against Certificate DN field
1836 * @cert: Certificate
1837 * @nid: NID of DN field
1838 * @field: Field name
1839 * @value DN field value which is passed from configuration
1840 * e.g., if configuration have C=US and this argument will point to US.
1841 * @dn_cnt: DN matching context
1842 * Returns: 1 on success and 0 on failure
1843 */
match_dn_field(const X509 * cert,int nid,const char * field,const char * value,const struct tls_dn_field_order_cnt * dn_cnt)1844 static int match_dn_field(const X509 *cert, int nid, const char *field,
1845 const char *value,
1846 const struct tls_dn_field_order_cnt *dn_cnt)
1847 {
1848 int i, ret = 0, len, config_dn_field_index, match_index = 0;
1849 X509_NAME *name;
1850
1851 len = os_strlen(value);
1852 name = X509_get_subject_name((X509 *) cert);
1853
1854 /* Assign incremented cnt for every field of DN to check DN field in
1855 * right order */
1856 config_dn_field_index = get_dn_field_index(dn_cnt, nid);
1857 if (config_dn_field_index < 0)
1858 return 0;
1859
1860 /* Fetch value based on NID */
1861 for (i = -1; (i = X509_NAME_get_index_by_NID(name, nid, i)) > -1;) {
1862 X509_NAME_ENTRY *e;
1863 ASN1_STRING *cn;
1864
1865 e = X509_NAME_get_entry(name, i);
1866 if (!e)
1867 continue;
1868
1869 cn = X509_NAME_ENTRY_get_data(e);
1870 if (!cn)
1871 continue;
1872
1873 match_index++;
1874
1875 /* check for more than one DN field with same name */
1876 if (match_index != config_dn_field_index)
1877 continue;
1878
1879 /* Check wildcard at the right end side */
1880 /* E.g., if OU=develop* mentioned in configuration, allow 'OU'
1881 * of the subject in the client certificate to start with
1882 * 'develop' */
1883 if (len > 0 && value[len - 1] == '*') {
1884 /* Compare actual certificate DN field value with
1885 * configuration DN field value up to the specified
1886 * length. */
1887 ret = ASN1_STRING_length(cn) >= len - 1 &&
1888 os_memcmp(ASN1_STRING_get0_data(cn), value,
1889 len - 1) == 0;
1890 } else {
1891 /* Compare actual certificate DN field value with
1892 * configuration DN field value */
1893 ret = ASN1_STRING_length(cn) == len &&
1894 os_memcmp(ASN1_STRING_get0_data(cn), value,
1895 len) == 0;
1896 }
1897 if (!ret) {
1898 wpa_printf(MSG_ERROR,
1899 "OpenSSL: Failed to match %s '%s' with certificate DN field value '%s'",
1900 field, value, ASN1_STRING_get0_data(cn));
1901 }
1902 break;
1903 }
1904
1905 return ret;
1906 }
1907
1908
1909 /**
1910 * get_value_from_field - Get value from DN field
1911 * @cert: Certificate
1912 * @field_str: DN field string which is passed from configuration file (e.g.,
1913 * C=US)
1914 * @dn_cnt: DN matching context
1915 * Returns: 1 on success and 0 on failure
1916 */
get_value_from_field(const X509 * cert,char * field_str,struct tls_dn_field_order_cnt * dn_cnt)1917 static int get_value_from_field(const X509 *cert, char *field_str,
1918 struct tls_dn_field_order_cnt *dn_cnt)
1919 {
1920 int nid;
1921 char *context = NULL, *name, *value;
1922
1923 if (os_strcmp(field_str, "*") == 0)
1924 return 1; /* wildcard matches everything */
1925
1926 name = str_token(field_str, "=", &context);
1927 if (!name)
1928 return 0;
1929
1930 /* Compare all configured DN fields and assign nid based on that to
1931 * fetch correct value from certificate subject */
1932 if (os_strcmp(name, "CN") == 0) {
1933 nid = NID_commonName;
1934 dn_cnt->cn++;
1935 } else if(os_strcmp(name, "C") == 0) {
1936 nid = NID_countryName;
1937 dn_cnt->c++;
1938 } else if (os_strcmp(name, "L") == 0) {
1939 nid = NID_localityName;
1940 dn_cnt->l++;
1941 } else if (os_strcmp(name, "ST") == 0) {
1942 nid = NID_stateOrProvinceName;
1943 dn_cnt->st++;
1944 } else if (os_strcmp(name, "O") == 0) {
1945 nid = NID_organizationName;
1946 dn_cnt->o++;
1947 } else if (os_strcmp(name, "OU") == 0) {
1948 nid = NID_organizationalUnitName;
1949 dn_cnt->ou++;
1950 } else if (os_strcmp(name, "emailAddress") == 0) {
1951 nid = NID_pkcs9_emailAddress;
1952 dn_cnt->email++;
1953 } else {
1954 wpa_printf(MSG_ERROR,
1955 "TLS: Unknown field '%s' in check_cert_subject", name);
1956 return 0;
1957 }
1958
1959 value = str_token(field_str, "=", &context);
1960 if (!value) {
1961 wpa_printf(MSG_ERROR,
1962 "TLS: Distinguished Name field '%s' value is not defined in check_cert_subject",
1963 name);
1964 return 0;
1965 }
1966
1967 return match_dn_field(cert, nid, name, value, dn_cnt);
1968 }
1969
1970
1971 /**
1972 * tls_match_dn_field - Match subject DN field with check_cert_subject
1973 * @cert: Certificate
1974 * @match: check_cert_subject string
1975 * Returns: Return 1 on success and 0 on failure
1976 */
tls_match_dn_field(X509 * cert,const char * match)1977 static int tls_match_dn_field(X509 *cert, const char *match)
1978 {
1979 const char *token, *last = NULL;
1980 char field[256];
1981 struct tls_dn_field_order_cnt dn_cnt;
1982
1983 os_memset(&dn_cnt, 0, sizeof(dn_cnt));
1984
1985 /* Maximum length of each DN field is 255 characters */
1986
1987 /* Process each '/' delimited field */
1988 while ((token = cstr_token(match, "/", &last))) {
1989 if (last - token >= (int) sizeof(field)) {
1990 wpa_printf(MSG_ERROR,
1991 "OpenSSL: Too long DN matching field value in '%s'",
1992 match);
1993 return 0;
1994 }
1995 os_memcpy(field, token, last - token);
1996 field[last - token] = '\0';
1997
1998 if (!get_value_from_field(cert, field, &dn_cnt)) {
1999 wpa_printf(MSG_DEBUG, "OpenSSL: No match for DN '%s'",
2000 field);
2001 return 0;
2002 }
2003 }
2004
2005 return 1;
2006 }
2007
2008
2009 #ifndef CONFIG_NATIVE_WINDOWS
tls_match_suffix_helper(X509 * cert,const char * match,size_t match_len,int full)2010 static int tls_match_suffix_helper(X509 *cert, const char *match,
2011 size_t match_len, int full)
2012 {
2013 GENERAL_NAME *gen;
2014 void *ext;
2015 int i;
2016 stack_index_t j;
2017 int dns_name = 0;
2018 X509_NAME *name;
2019
2020 wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
2021 full ? "": "suffix ", match);
2022
2023 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
2024
2025 for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
2026 gen = sk_GENERAL_NAME_value(ext, j);
2027 if (gen->type != GEN_DNS)
2028 continue;
2029 dns_name++;
2030 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
2031 gen->d.dNSName->data,
2032 gen->d.dNSName->length);
2033 if (domain_suffix_match(gen->d.dNSName->data,
2034 gen->d.dNSName->length,
2035 match, match_len, full) == 1) {
2036 wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
2037 full ? "Match" : "Suffix match");
2038 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2039 return 1;
2040 }
2041 }
2042 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2043
2044 if (dns_name) {
2045 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
2046 return 0;
2047 }
2048
2049 name = X509_get_subject_name(cert);
2050 i = -1;
2051 for (;;) {
2052 X509_NAME_ENTRY *e;
2053 ASN1_STRING *cn;
2054
2055 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
2056 if (i == -1)
2057 break;
2058 e = X509_NAME_get_entry(name, i);
2059 if (e == NULL)
2060 continue;
2061 cn = X509_NAME_ENTRY_get_data(e);
2062 if (cn == NULL)
2063 continue;
2064 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
2065 cn->data, cn->length);
2066 if (domain_suffix_match(cn->data, cn->length,
2067 match, match_len, full) == 1) {
2068 wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
2069 full ? "Match" : "Suffix match");
2070 return 1;
2071 }
2072 }
2073
2074 wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
2075 full ? "": "suffix ");
2076 return 0;
2077 }
2078 #endif /* CONFIG_NATIVE_WINDOWS */
2079
2080
tls_match_suffix(X509 * cert,const char * match,int full)2081 static int tls_match_suffix(X509 *cert, const char *match, int full)
2082 {
2083 #ifdef CONFIG_NATIVE_WINDOWS
2084 /* wincrypt.h has conflicting X509_NAME definition */
2085 return -1;
2086 #else /* CONFIG_NATIVE_WINDOWS */
2087 const char *token, *last = NULL;
2088
2089 /* Process each match alternative separately until a match is found */
2090 while ((token = cstr_token(match, ";", &last))) {
2091 if (tls_match_suffix_helper(cert, token, last - token, full))
2092 return 1;
2093 }
2094
2095 return 0;
2096 #endif /* CONFIG_NATIVE_WINDOWS */
2097 }
2098
2099
openssl_tls_fail_reason(int err)2100 static enum tls_fail_reason openssl_tls_fail_reason(int err)
2101 {
2102 switch (err) {
2103 case X509_V_ERR_CERT_REVOKED:
2104 return TLS_FAIL_REVOKED;
2105 case X509_V_ERR_CERT_NOT_YET_VALID:
2106 case X509_V_ERR_CRL_NOT_YET_VALID:
2107 return TLS_FAIL_NOT_YET_VALID;
2108 case X509_V_ERR_CERT_HAS_EXPIRED:
2109 case X509_V_ERR_CRL_HAS_EXPIRED:
2110 return TLS_FAIL_EXPIRED;
2111 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2112 case X509_V_ERR_UNABLE_TO_GET_CRL:
2113 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
2114 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
2115 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
2116 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
2117 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
2118 case X509_V_ERR_CERT_CHAIN_TOO_LONG:
2119 case X509_V_ERR_PATH_LENGTH_EXCEEDED:
2120 case X509_V_ERR_INVALID_CA:
2121 return TLS_FAIL_UNTRUSTED;
2122 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
2123 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
2124 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
2125 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2126 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2127 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
2128 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
2129 case X509_V_ERR_CERT_UNTRUSTED:
2130 case X509_V_ERR_CERT_REJECTED:
2131 return TLS_FAIL_BAD_CERTIFICATE;
2132 default:
2133 return TLS_FAIL_UNSPECIFIED;
2134 }
2135 }
2136
2137
get_x509_cert(X509 * cert)2138 static struct wpabuf * get_x509_cert(X509 *cert)
2139 {
2140 struct wpabuf *buf;
2141 u8 *tmp;
2142
2143 int cert_len = i2d_X509(cert, NULL);
2144 if (cert_len <= 0)
2145 return NULL;
2146
2147 buf = wpabuf_alloc(cert_len);
2148 if (buf == NULL)
2149 return NULL;
2150
2151 tmp = wpabuf_put(buf, cert_len);
2152 i2d_X509(cert, &tmp);
2153 return buf;
2154 }
2155
2156
openssl_tls_fail_event(struct tls_connection * conn,X509 * err_cert,int err,int depth,const char * subject,const char * err_str,enum tls_fail_reason reason)2157 static void openssl_tls_fail_event(struct tls_connection *conn,
2158 X509 *err_cert, int err, int depth,
2159 const char *subject, const char *err_str,
2160 enum tls_fail_reason reason)
2161 {
2162 union tls_event_data ev;
2163 struct wpabuf *cert = NULL;
2164 struct tls_context *context = conn->context;
2165
2166 #ifdef ANDROID
2167 log_cert_validation_failure(err_str);
2168 #endif
2169
2170 if (context->event_cb == NULL)
2171 return;
2172
2173 cert = get_x509_cert(err_cert);
2174 os_memset(&ev, 0, sizeof(ev));
2175 ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
2176 reason : openssl_tls_fail_reason(err);
2177 ev.cert_fail.depth = depth;
2178 ev.cert_fail.subject = subject;
2179 ev.cert_fail.reason_txt = err_str;
2180 ev.cert_fail.cert = cert;
2181 context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
2182 wpabuf_free(cert);
2183 }
2184
2185
openssl_cert_tod(X509 * cert)2186 static int openssl_cert_tod(X509 *cert)
2187 {
2188 CERTIFICATEPOLICIES *ext;
2189 stack_index_t i;
2190 char buf[100];
2191 int res;
2192 int tod = 0;
2193
2194 ext = X509_get_ext_d2i(cert, NID_certificate_policies, NULL, NULL);
2195 if (!ext)
2196 return 0;
2197
2198 for (i = 0; i < sk_POLICYINFO_num(ext); i++) {
2199 POLICYINFO *policy;
2200
2201 policy = sk_POLICYINFO_value(ext, i);
2202 res = OBJ_obj2txt(buf, sizeof(buf), policy->policyid, 0);
2203 if (res < 0 || (size_t) res >= sizeof(buf))
2204 continue;
2205 wpa_printf(MSG_DEBUG, "OpenSSL: Certificate Policy %s", buf);
2206 if (os_strcmp(buf, "1.3.6.1.4.1.40808.1.3.1") == 0)
2207 tod = 1; /* TOD-STRICT */
2208 else if (os_strcmp(buf, "1.3.6.1.4.1.40808.1.3.2") == 0 && !tod)
2209 tod = 2; /* TOD-TOFU */
2210 }
2211 sk_POLICYINFO_pop_free(ext, POLICYINFO_free);
2212
2213 return tod;
2214 }
2215
2216
openssl_tls_cert_event(struct tls_connection * conn,X509 * err_cert,int depth,const char * subject)2217 static void openssl_tls_cert_event(struct tls_connection *conn,
2218 X509 *err_cert, int depth,
2219 const char *subject)
2220 {
2221 struct wpabuf *cert = NULL;
2222 union tls_event_data ev;
2223 struct tls_context *context = conn->context;
2224 char *altsubject[TLS_MAX_ALT_SUBJECT];
2225 int alt, num_altsubject = 0;
2226 GENERAL_NAME *gen;
2227 void *ext;
2228 stack_index_t i;
2229 ASN1_INTEGER *ser;
2230 char serial_num[128];
2231 #ifdef CONFIG_SHA256
2232 u8 hash[32];
2233 #endif /* CONFIG_SHA256 */
2234
2235 if (context->event_cb == NULL)
2236 return;
2237
2238 os_memset(&ev, 0, sizeof(ev));
2239 if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
2240 context->cert_in_cb) {
2241 cert = get_x509_cert(err_cert);
2242 ev.peer_cert.cert = cert;
2243 }
2244 #ifdef CONFIG_SHA256
2245 if (cert) {
2246 const u8 *addr[1];
2247 size_t len[1];
2248 addr[0] = wpabuf_head(cert);
2249 len[0] = wpabuf_len(cert);
2250 if (sha256_vector(1, addr, len, hash) == 0) {
2251 ev.peer_cert.hash = hash;
2252 ev.peer_cert.hash_len = sizeof(hash);
2253 }
2254 }
2255 #endif /* CONFIG_SHA256 */
2256 ev.peer_cert.depth = depth;
2257 ev.peer_cert.subject = subject;
2258
2259 ser = X509_get_serialNumber(err_cert);
2260 if (ser) {
2261 wpa_snprintf_hex_uppercase(serial_num, sizeof(serial_num),
2262 ASN1_STRING_get0_data(ser),
2263 ASN1_STRING_length(ser));
2264 ev.peer_cert.serial_num = serial_num;
2265 }
2266
2267 ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
2268 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
2269 char *pos;
2270
2271 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
2272 break;
2273 gen = sk_GENERAL_NAME_value(ext, i);
2274 if (gen->type != GEN_EMAIL &&
2275 gen->type != GEN_DNS &&
2276 gen->type != GEN_URI)
2277 continue;
2278
2279 pos = os_malloc(10 + gen->d.ia5->length + 1);
2280 if (pos == NULL)
2281 break;
2282 altsubject[num_altsubject++] = pos;
2283
2284 switch (gen->type) {
2285 case GEN_EMAIL:
2286 os_memcpy(pos, "EMAIL:", 6);
2287 pos += 6;
2288 break;
2289 case GEN_DNS:
2290 os_memcpy(pos, "DNS:", 4);
2291 pos += 4;
2292 break;
2293 case GEN_URI:
2294 os_memcpy(pos, "URI:", 4);
2295 pos += 4;
2296 break;
2297 }
2298
2299 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
2300 pos += gen->d.ia5->length;
2301 *pos = '\0';
2302 }
2303 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2304
2305 for (alt = 0; alt < num_altsubject; alt++)
2306 ev.peer_cert.altsubject[alt] = altsubject[alt];
2307 ev.peer_cert.num_altsubject = num_altsubject;
2308
2309 ev.peer_cert.tod = openssl_cert_tod(err_cert);
2310
2311 context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
2312 wpabuf_free(cert);
2313 for (alt = 0; alt < num_altsubject; alt++)
2314 os_free(altsubject[alt]);
2315 }
2316
2317
debug_print_cert(X509 * cert,const char * title)2318 static void debug_print_cert(X509 *cert, const char *title)
2319 {
2320 #ifndef CONFIG_NO_STDOUT_DEBUG
2321 BIO *out;
2322 size_t rlen;
2323 char *txt;
2324 int res;
2325
2326 if (wpa_debug_level > MSG_DEBUG)
2327 return;
2328
2329 out = BIO_new(BIO_s_mem());
2330 if (!out)
2331 return;
2332
2333 X509_print(out, cert);
2334 rlen = BIO_ctrl_pending(out);
2335 txt = os_malloc(rlen + 1);
2336 if (txt) {
2337 res = BIO_read(out, txt, rlen);
2338 if (res > 0) {
2339 txt[res] = '\0';
2340 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
2341 }
2342 os_free(txt);
2343 }
2344
2345 BIO_free(out);
2346 #endif /* CONFIG_NO_STDOUT_DEBUG */
2347 }
2348
2349
tls_verify_cb(int preverify_ok,X509_STORE_CTX * x509_ctx)2350 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
2351 {
2352 char buf[256];
2353 X509 *err_cert;
2354 int err, depth;
2355 SSL *ssl;
2356 struct tls_connection *conn;
2357 struct tls_context *context;
2358 char *match, *altmatch, *suffix_match, *domain_match;
2359 const char *check_cert_subject;
2360 const char *err_str;
2361
2362 err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
2363 if (!err_cert)
2364 return 0;
2365
2366 err = X509_STORE_CTX_get_error(x509_ctx);
2367 depth = X509_STORE_CTX_get_error_depth(x509_ctx);
2368 ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
2369 SSL_get_ex_data_X509_STORE_CTX_idx());
2370 os_snprintf(buf, sizeof(buf), "Peer certificate - depth %d", depth);
2371 debug_print_cert(err_cert, buf);
2372 X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
2373
2374 conn = SSL_get_app_data(ssl);
2375 if (conn == NULL)
2376 return 0;
2377
2378 if (depth == 0)
2379 conn->peer_cert = err_cert;
2380 else if (depth == 1)
2381 conn->peer_issuer = err_cert;
2382 else if (depth == 2)
2383 conn->peer_issuer_issuer = err_cert;
2384
2385 context = conn->context;
2386 match = conn->subject_match;
2387 altmatch = conn->altsubject_match;
2388 suffix_match = conn->suffix_match;
2389 domain_match = conn->domain_match;
2390
2391 if (!preverify_ok && !conn->ca_cert_verify)
2392 preverify_ok = 1;
2393 if (!preverify_ok && depth > 0 && conn->server_cert_only)
2394 preverify_ok = 1;
2395 if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
2396 (err == X509_V_ERR_CERT_HAS_EXPIRED ||
2397 err == X509_V_ERR_CERT_NOT_YET_VALID)) {
2398 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
2399 "time mismatch");
2400 preverify_ok = 1;
2401 }
2402 if (!preverify_ok && !conn->data->check_crl_strict &&
2403 (err == X509_V_ERR_CRL_HAS_EXPIRED ||
2404 err == X509_V_ERR_CRL_NOT_YET_VALID)) {
2405 wpa_printf(MSG_DEBUG,
2406 "OpenSSL: Ignore certificate validity CRL time mismatch");
2407 preverify_ok = 1;
2408 }
2409
2410 err_str = X509_verify_cert_error_string(err);
2411
2412 #ifdef CONFIG_SHA256
2413 /*
2414 * Do not require preverify_ok so we can explicity allow otherwise
2415 * invalid pinned server certificates.
2416 */
2417 if (depth == 0 && conn->server_cert_only) {
2418 struct wpabuf *cert;
2419 cert = get_x509_cert(err_cert);
2420 if (!cert) {
2421 wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
2422 "server certificate data");
2423 preverify_ok = 0;
2424 } else {
2425 u8 hash[32];
2426 const u8 *addr[1];
2427 size_t len[1];
2428 addr[0] = wpabuf_head(cert);
2429 len[0] = wpabuf_len(cert);
2430 if (sha256_vector(1, addr, len, hash) < 0 ||
2431 os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
2432 err_str = "Server certificate mismatch";
2433 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
2434 preverify_ok = 0;
2435 } else if (!preverify_ok) {
2436 /*
2437 * Certificate matches pinned certificate, allow
2438 * regardless of other problems.
2439 */
2440 wpa_printf(MSG_DEBUG,
2441 "OpenSSL: Ignore validation issues for a pinned server certificate");
2442 preverify_ok = 1;
2443 }
2444 wpabuf_free(cert);
2445 }
2446 }
2447 #endif /* CONFIG_SHA256 */
2448
2449 openssl_tls_cert_event(conn, err_cert, depth, buf);
2450
2451 if (!preverify_ok) {
2452 if (depth > 0) {
2453 /* Send cert event for the peer certificate so that
2454 * the upper layers get information about it even if
2455 * validation of a CA certificate fails. */
2456 STACK_OF(X509) *chain;
2457
2458 chain = X509_STORE_CTX_get1_chain(x509_ctx);
2459 if (chain && sk_X509_num(chain) > 0) {
2460 char buf2[256];
2461 X509 *cert;
2462
2463 cert = sk_X509_value(chain, 0);
2464 X509_NAME_oneline(X509_get_subject_name(cert),
2465 buf2, sizeof(buf2));
2466
2467 openssl_tls_cert_event(conn, cert, 0, buf2);
2468 }
2469 if (chain)
2470 sk_X509_pop_free(chain, X509_free);
2471 }
2472
2473 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
2474 " error %d (%s) depth %d for '%s'", err, err_str,
2475 depth, buf);
2476 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2477 err_str, TLS_FAIL_UNSPECIFIED);
2478 return preverify_ok;
2479 }
2480
2481 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
2482 "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
2483 preverify_ok, err, err_str,
2484 conn->ca_cert_verify, depth, buf);
2485 check_cert_subject = conn->check_cert_subject;
2486 if (!check_cert_subject)
2487 check_cert_subject = conn->data->check_cert_subject;
2488 if (check_cert_subject) {
2489 if (depth == 0 &&
2490 !tls_match_dn_field(err_cert, check_cert_subject)) {
2491 preverify_ok = 0;
2492 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2493 "Distinguished Name",
2494 TLS_FAIL_DN_MISMATCH);
2495 }
2496 }
2497 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
2498 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
2499 "match with '%s'", buf, match);
2500 preverify_ok = 0;
2501 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2502 "Subject mismatch",
2503 TLS_FAIL_SUBJECT_MISMATCH);
2504 } else if (depth == 0 && altmatch &&
2505 !tls_match_altsubject(err_cert, altmatch)) {
2506 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
2507 "'%s' not found", altmatch);
2508 preverify_ok = 0;
2509 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2510 "AltSubject mismatch",
2511 TLS_FAIL_ALTSUBJECT_MISMATCH);
2512 } else if (depth == 0 && suffix_match &&
2513 !tls_match_suffix(err_cert, suffix_match, 0)) {
2514 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
2515 suffix_match);
2516 preverify_ok = 0;
2517 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2518 "Domain suffix mismatch",
2519 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
2520 } else if (depth == 0 && domain_match &&
2521 !tls_match_suffix(err_cert, domain_match, 1)) {
2522 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
2523 domain_match);
2524 preverify_ok = 0;
2525 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2526 "Domain mismatch",
2527 TLS_FAIL_DOMAIN_MISMATCH);
2528 }
2529
2530 if (conn->cert_probe && preverify_ok && depth == 0) {
2531 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
2532 "on probe-only run");
2533 preverify_ok = 0;
2534 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2535 "Server certificate chain probe",
2536 TLS_FAIL_SERVER_CHAIN_PROBE);
2537 }
2538
2539 #ifdef CONFIG_SUITEB
2540 if (conn->flags & TLS_CONN_SUITEB) {
2541 EVP_PKEY *pk;
2542 RSA *rsa;
2543 int len = -1;
2544
2545 pk = X509_get_pubkey(err_cert);
2546 if (pk) {
2547 rsa = EVP_PKEY_get1_RSA(pk);
2548 if (rsa) {
2549 len = RSA_bits(rsa);
2550 RSA_free(rsa);
2551 }
2552 EVP_PKEY_free(pk);
2553 }
2554
2555 if (len >= 0) {
2556 wpa_printf(MSG_DEBUG,
2557 "OpenSSL: RSA modulus size: %d bits", len);
2558 if (len < 3072) {
2559 preverify_ok = 0;
2560 openssl_tls_fail_event(
2561 conn, err_cert, err,
2562 depth, buf,
2563 "Insufficient RSA modulus size",
2564 TLS_FAIL_INSUFFICIENT_KEY_LEN);
2565 }
2566 }
2567 }
2568 #endif /* CONFIG_SUITEB */
2569
2570 #ifdef OPENSSL_IS_BORINGSSL
2571 if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
2572 preverify_ok) {
2573 enum ocsp_result res;
2574
2575 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
2576 conn->peer_issuer,
2577 conn->peer_issuer_issuer);
2578 if (res == OCSP_REVOKED) {
2579 preverify_ok = 0;
2580 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2581 "certificate revoked",
2582 TLS_FAIL_REVOKED);
2583 if (err == X509_V_OK)
2584 X509_STORE_CTX_set_error(
2585 x509_ctx, X509_V_ERR_CERT_REVOKED);
2586 } else if (res != OCSP_GOOD &&
2587 (conn->flags & TLS_CONN_REQUIRE_OCSP)) {
2588 preverify_ok = 0;
2589 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2590 "bad certificate status response",
2591 TLS_FAIL_UNSPECIFIED);
2592 }
2593 }
2594 #endif /* OPENSSL_IS_BORINGSSL */
2595
2596 if (depth == 0 && preverify_ok && context->event_cb != NULL)
2597 context->event_cb(context->cb_ctx,
2598 TLS_CERT_CHAIN_SUCCESS, NULL);
2599
2600 return preverify_ok;
2601 }
2602
2603
2604 #ifndef OPENSSL_NO_STDIO
tls_load_ca_der(struct tls_data * data,const char * ca_cert)2605 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
2606 {
2607 SSL_CTX *ssl_ctx = data->ssl;
2608 X509_LOOKUP *lookup;
2609 int ret = 0;
2610
2611 lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
2612 X509_LOOKUP_file());
2613 if (lookup == NULL) {
2614 tls_show_errors(MSG_WARNING, __func__,
2615 "Failed add lookup for X509 store");
2616 return -1;
2617 }
2618
2619 if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
2620 unsigned long err = ERR_peek_error();
2621 tls_show_errors(MSG_WARNING, __func__,
2622 "Failed load CA in DER format");
2623 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2624 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2625 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2626 "cert already in hash table error",
2627 __func__);
2628 } else
2629 ret = -1;
2630 }
2631
2632 return ret;
2633 }
2634 #endif /* OPENSSL_NO_STDIO */
2635
2636
tls_connection_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert,const u8 * ca_cert_blob,size_t ca_cert_blob_len,const char * ca_path)2637 static int tls_connection_ca_cert(struct tls_data *data,
2638 struct tls_connection *conn,
2639 const char *ca_cert, const u8 *ca_cert_blob,
2640 size_t ca_cert_blob_len, const char *ca_path)
2641 {
2642 SSL_CTX *ssl_ctx = data->ssl;
2643 X509_STORE *store;
2644
2645 /*
2646 * Remove previously configured trusted CA certificates before adding
2647 * new ones.
2648 */
2649 store = X509_STORE_new();
2650 if (store == NULL) {
2651 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2652 "certificate store", __func__);
2653 return -1;
2654 }
2655 SSL_CTX_set_cert_store(ssl_ctx, store);
2656
2657 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2658 conn->ca_cert_verify = 1;
2659
2660 if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
2661 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
2662 "chain");
2663 conn->cert_probe = 1;
2664 conn->ca_cert_verify = 0;
2665 return 0;
2666 }
2667
2668 if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
2669 #ifdef CONFIG_SHA256
2670 const char *pos = ca_cert + 7;
2671 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
2672 wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
2673 "hash value '%s'", ca_cert);
2674 return -1;
2675 }
2676 pos += 14;
2677 if (os_strlen(pos) != 32 * 2) {
2678 wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
2679 "hash length in ca_cert '%s'", ca_cert);
2680 return -1;
2681 }
2682 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
2683 wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
2684 "value in ca_cert '%s'", ca_cert);
2685 return -1;
2686 }
2687 conn->server_cert_only = 1;
2688 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
2689 "certificate match");
2690 return 0;
2691 #else /* CONFIG_SHA256 */
2692 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
2693 "cannot validate server certificate hash");
2694 return -1;
2695 #endif /* CONFIG_SHA256 */
2696 }
2697
2698 if (ca_cert_blob) {
2699 X509 *cert = d2i_X509(NULL,
2700 (const unsigned char **) &ca_cert_blob,
2701 ca_cert_blob_len);
2702 if (cert == NULL) {
2703 BIO *bio = BIO_new_mem_buf(ca_cert_blob,
2704 ca_cert_blob_len);
2705
2706 if (bio) {
2707 cert = PEM_read_bio_X509(bio, NULL, NULL, NULL);
2708 BIO_free(bio);
2709 }
2710
2711 if (!cert) {
2712 tls_show_errors(MSG_WARNING, __func__,
2713 "Failed to parse ca_cert_blob");
2714 return -1;
2715 }
2716
2717 while (ERR_get_error()) {
2718 /* Ignore errors from DER conversion. */
2719 }
2720 }
2721
2722 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
2723 cert)) {
2724 unsigned long err = ERR_peek_error();
2725 tls_show_errors(MSG_WARNING, __func__,
2726 "Failed to add ca_cert_blob to "
2727 "certificate store");
2728 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2729 ERR_GET_REASON(err) ==
2730 X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2731 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2732 "cert already in hash table error",
2733 __func__);
2734 } else {
2735 X509_free(cert);
2736 return -1;
2737 }
2738 }
2739 X509_free(cert);
2740 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
2741 "to certificate store", __func__);
2742 return 0;
2743 }
2744
2745 #ifdef ANDROID
2746 /* Single alias */
2747 if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
2748 if (tls_add_ca_from_keystore(SSL_CTX_get_cert_store(ssl_ctx),
2749 &ca_cert[11]) < 0)
2750 return -1;
2751 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2752 return 0;
2753 }
2754
2755 /* Multiple aliases separated by space */
2756 if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) {
2757 char *aliases = os_strdup(&ca_cert[12]);
2758 const char *delim = " ";
2759 int rc = 0;
2760 char *savedptr;
2761 char *alias;
2762
2763 if (!aliases)
2764 return -1;
2765 alias = strtok_r(aliases, delim, &savedptr);
2766 for (; alias; alias = strtok_r(NULL, delim, &savedptr)) {
2767 if (tls_add_ca_from_keystore_encoded(
2768 SSL_CTX_get_cert_store(ssl_ctx), alias)) {
2769 wpa_printf(MSG_WARNING,
2770 "OpenSSL: %s - Failed to add ca_cert %s from keystore",
2771 __func__, alias);
2772 rc = -1;
2773 break;
2774 }
2775 }
2776 os_free(aliases);
2777 if (rc)
2778 return rc;
2779
2780 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2781 return 0;
2782 }
2783 #endif /* ANDROID */
2784
2785 #ifdef CONFIG_NATIVE_WINDOWS
2786 if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
2787 0) {
2788 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
2789 "system certificate store");
2790 return 0;
2791 }
2792 #endif /* CONFIG_NATIVE_WINDOWS */
2793
2794 if (ca_cert || ca_path) {
2795 #ifndef OPENSSL_NO_STDIO
2796 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
2797 1) {
2798 tls_show_errors(MSG_WARNING, __func__,
2799 "Failed to load root certificates");
2800 if (ca_cert &&
2801 tls_load_ca_der(data, ca_cert) == 0) {
2802 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
2803 "DER format CA certificate",
2804 __func__);
2805 } else
2806 return -1;
2807 } else {
2808 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2809 "certificate(s) loaded");
2810 tls_get_errors(data);
2811 }
2812 #else /* OPENSSL_NO_STDIO */
2813 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2814 __func__);
2815 return -1;
2816 #endif /* OPENSSL_NO_STDIO */
2817 } else {
2818 /* No ca_cert configured - do not try to verify server
2819 * certificate */
2820 conn->ca_cert_verify = 0;
2821 }
2822
2823 return 0;
2824 }
2825
2826
tls_global_ca_cert(struct tls_data * data,const char * ca_cert)2827 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
2828 {
2829 SSL_CTX *ssl_ctx = data->ssl;
2830
2831 if (ca_cert) {
2832 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
2833 {
2834 tls_show_errors(MSG_WARNING, __func__,
2835 "Failed to load root certificates");
2836 return -1;
2837 }
2838
2839 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2840 "certificate(s) loaded");
2841
2842 #ifndef OPENSSL_NO_STDIO
2843 /* Add the same CAs to the client certificate requests */
2844 SSL_CTX_set_client_CA_list(ssl_ctx,
2845 SSL_load_client_CA_file(ca_cert));
2846 #endif /* OPENSSL_NO_STDIO */
2847
2848 os_free(data->ca_cert);
2849 data->ca_cert = os_strdup(ca_cert);
2850 }
2851
2852 return 0;
2853 }
2854
2855
tls_global_set_verify(void * ssl_ctx,int check_crl,int strict)2856 int tls_global_set_verify(void *ssl_ctx, int check_crl, int strict)
2857 {
2858 int flags;
2859
2860 if (check_crl) {
2861 struct tls_data *data = ssl_ctx;
2862 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
2863 if (cs == NULL) {
2864 tls_show_errors(MSG_INFO, __func__, "Failed to get "
2865 "certificate store when enabling "
2866 "check_crl");
2867 return -1;
2868 }
2869 flags = X509_V_FLAG_CRL_CHECK;
2870 if (check_crl == 2)
2871 flags |= X509_V_FLAG_CRL_CHECK_ALL;
2872 X509_STORE_set_flags(cs, flags);
2873
2874 data->check_crl = check_crl;
2875 data->check_crl_strict = strict;
2876 os_get_reltime(&data->crl_last_reload);
2877 }
2878 return 0;
2879 }
2880
2881
tls_connection_set_subject_match(struct tls_connection * conn,const char * subject_match,const char * altsubject_match,const char * suffix_match,const char * domain_match,const char * check_cert_subject)2882 static int tls_connection_set_subject_match(struct tls_connection *conn,
2883 const char *subject_match,
2884 const char *altsubject_match,
2885 const char *suffix_match,
2886 const char *domain_match,
2887 const char *check_cert_subject)
2888 {
2889 os_free(conn->subject_match);
2890 conn->subject_match = NULL;
2891 if (subject_match) {
2892 conn->subject_match = os_strdup(subject_match);
2893 if (conn->subject_match == NULL)
2894 return -1;
2895 }
2896
2897 os_free(conn->altsubject_match);
2898 conn->altsubject_match = NULL;
2899 if (altsubject_match) {
2900 conn->altsubject_match = os_strdup(altsubject_match);
2901 if (conn->altsubject_match == NULL)
2902 return -1;
2903 }
2904
2905 os_free(conn->suffix_match);
2906 conn->suffix_match = NULL;
2907 if (suffix_match) {
2908 conn->suffix_match = os_strdup(suffix_match);
2909 if (conn->suffix_match == NULL)
2910 return -1;
2911 }
2912
2913 os_free(conn->domain_match);
2914 conn->domain_match = NULL;
2915 if (domain_match) {
2916 conn->domain_match = os_strdup(domain_match);
2917 if (conn->domain_match == NULL)
2918 return -1;
2919 }
2920
2921 os_free(conn->check_cert_subject);
2922 conn->check_cert_subject = NULL;
2923 if (check_cert_subject) {
2924 conn->check_cert_subject = os_strdup(check_cert_subject);
2925 if (!conn->check_cert_subject)
2926 return -1;
2927 }
2928
2929 return 0;
2930 }
2931
2932
2933 #ifdef CONFIG_SUITEB
2934 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
suiteb_cert_cb(SSL * ssl,void * arg)2935 static int suiteb_cert_cb(SSL *ssl, void *arg)
2936 {
2937 struct tls_connection *conn = arg;
2938
2939 /*
2940 * This cert_cb() is not really the best location for doing a
2941 * constraint check for the ServerKeyExchange message, but this seems to
2942 * be the only place where the current OpenSSL sequence can be
2943 * terminated cleanly with an TLS alert going out to the server.
2944 */
2945
2946 if (!(conn->flags & TLS_CONN_SUITEB))
2947 return 1;
2948
2949 /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
2950 if (conn->cipher_suite != 0x9f)
2951 return 1;
2952
2953 if (conn->server_dh_prime_len >= 3072)
2954 return 1;
2955
2956 wpa_printf(MSG_DEBUG,
2957 "OpenSSL: Server DH prime length (%d bits) not sufficient for Suite B RSA - reject handshake",
2958 conn->server_dh_prime_len);
2959 return 0;
2960 }
2961 #endif /* OPENSSL_VERSION_NUMBER */
2962 #endif /* CONFIG_SUITEB */
2963
2964
tls_set_conn_flags(struct tls_connection * conn,unsigned int flags,const char * openssl_ciphers)2965 static int tls_set_conn_flags(struct tls_connection *conn, unsigned int flags,
2966 const char *openssl_ciphers)
2967 {
2968 SSL *ssl = conn->ssl;
2969
2970 #ifdef SSL_OP_NO_TICKET
2971 if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
2972 SSL_set_options(ssl, SSL_OP_NO_TICKET);
2973 else
2974 SSL_clear_options(ssl, SSL_OP_NO_TICKET);
2975 #endif /* SSL_OP_NO_TICKET */
2976
2977 #ifdef SSL_OP_NO_TLSv1
2978 if (flags & TLS_CONN_DISABLE_TLSv1_0)
2979 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
2980 else
2981 SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
2982 #endif /* SSL_OP_NO_TLSv1 */
2983 #ifdef SSL_OP_NO_TLSv1_1
2984 if (flags & TLS_CONN_DISABLE_TLSv1_1)
2985 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
2986 else
2987 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
2988 #endif /* SSL_OP_NO_TLSv1_1 */
2989 #ifdef SSL_OP_NO_TLSv1_2
2990 if (flags & TLS_CONN_DISABLE_TLSv1_2)
2991 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
2992 else
2993 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
2994 #endif /* SSL_OP_NO_TLSv1_2 */
2995 #ifdef SSL_OP_NO_TLSv1_3
2996 if (flags & TLS_CONN_DISABLE_TLSv1_3)
2997 SSL_set_options(ssl, SSL_OP_NO_TLSv1_3);
2998 else
2999 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_3);
3000 #endif /* SSL_OP_NO_TLSv1_3 */
3001 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
3002 if (flags & (TLS_CONN_ENABLE_TLSv1_0 |
3003 TLS_CONN_ENABLE_TLSv1_1 |
3004 TLS_CONN_ENABLE_TLSv1_2)) {
3005 int version = 0;
3006
3007 /* Explicit request to enable TLS versions even if needing to
3008 * override systemwide policies. */
3009 if (flags & TLS_CONN_ENABLE_TLSv1_0) {
3010 version = TLS1_VERSION;
3011 } else if (flags & TLS_CONN_ENABLE_TLSv1_1) {
3012 if (!(flags & TLS_CONN_DISABLE_TLSv1_0))
3013 version = TLS1_1_VERSION;
3014 } else if (flags & TLS_CONN_ENABLE_TLSv1_2) {
3015 if (!(flags & (TLS_CONN_DISABLE_TLSv1_0 |
3016 TLS_CONN_DISABLE_TLSv1_1)))
3017 version = TLS1_2_VERSION;
3018 }
3019 if (!version) {
3020 wpa_printf(MSG_DEBUG,
3021 "OpenSSL: Invalid TLS version configuration");
3022 return -1;
3023 }
3024
3025 if (SSL_set_min_proto_version(ssl, version) != 1) {
3026 wpa_printf(MSG_DEBUG,
3027 "OpenSSL: Failed to set minimum TLS version");
3028 return -1;
3029 }
3030 }
3031 #endif /* >= 1.1.0 */
3032
3033 #ifdef CONFIG_SUITEB
3034 #ifdef OPENSSL_IS_BORINGSSL
3035 /* Start with defaults from BoringSSL */
3036 SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, NULL, 0);
3037 #endif /* OPENSSL_IS_BORINGSSL */
3038 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
3039 if (flags & TLS_CONN_SUITEB_NO_ECDH) {
3040 const char *ciphers = "DHE-RSA-AES256-GCM-SHA384";
3041
3042 if (openssl_ciphers) {
3043 wpa_printf(MSG_DEBUG,
3044 "OpenSSL: Override ciphers for Suite B (no ECDH): %s",
3045 openssl_ciphers);
3046 ciphers = openssl_ciphers;
3047 }
3048 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
3049 wpa_printf(MSG_INFO,
3050 "OpenSSL: Failed to set Suite B ciphers");
3051 return -1;
3052 }
3053 } else if (flags & TLS_CONN_SUITEB) {
3054 EC_KEY *ecdh;
3055 const char *ciphers =
3056 "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384";
3057 int nid[1] = { NID_secp384r1 };
3058
3059 if (openssl_ciphers) {
3060 wpa_printf(MSG_DEBUG,
3061 "OpenSSL: Override ciphers for Suite B: %s",
3062 openssl_ciphers);
3063 ciphers = openssl_ciphers;
3064 }
3065 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
3066 wpa_printf(MSG_INFO,
3067 "OpenSSL: Failed to set Suite B ciphers");
3068 return -1;
3069 }
3070
3071 if (SSL_set1_curves(ssl, nid, 1) != 1) {
3072 wpa_printf(MSG_INFO,
3073 "OpenSSL: Failed to set Suite B curves");
3074 return -1;
3075 }
3076
3077 ecdh = EC_KEY_new_by_curve_name(NID_secp384r1);
3078 if (!ecdh || SSL_set_tmp_ecdh(ssl, ecdh) != 1) {
3079 EC_KEY_free(ecdh);
3080 wpa_printf(MSG_INFO,
3081 "OpenSSL: Failed to set ECDH parameter");
3082 return -1;
3083 }
3084 EC_KEY_free(ecdh);
3085 }
3086 if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
3087 #ifdef OPENSSL_IS_BORINGSSL
3088 uint16_t sigalgs[1] = { SSL_SIGN_RSA_PKCS1_SHA384 };
3089
3090 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
3091 1) != 1) {
3092 wpa_printf(MSG_INFO,
3093 "OpenSSL: Failed to set Suite B sigalgs");
3094 return -1;
3095 }
3096 #else /* OPENSSL_IS_BORINGSSL */
3097 /* ECDSA+SHA384 if need to add EC support here */
3098 if (SSL_set1_sigalgs_list(ssl, "RSA+SHA384") != 1) {
3099 wpa_printf(MSG_INFO,
3100 "OpenSSL: Failed to set Suite B sigalgs");
3101 return -1;
3102 }
3103 #endif /* OPENSSL_IS_BORINGSSL */
3104
3105 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
3106 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
3107 SSL_set_cert_cb(ssl, suiteb_cert_cb, conn);
3108 }
3109 #else /* OPENSSL_VERSION_NUMBER < 0x10002000L */
3110 if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
3111 wpa_printf(MSG_ERROR,
3112 "OpenSSL: Suite B RSA case not supported with this OpenSSL version");
3113 return -1;
3114 }
3115 #endif /* OPENSSL_VERSION_NUMBER */
3116
3117 #ifdef OPENSSL_IS_BORINGSSL
3118 if (openssl_ciphers && os_strcmp(openssl_ciphers, "SUITEB192") == 0) {
3119 uint16_t sigalgs[1] = { SSL_SIGN_ECDSA_SECP384R1_SHA384 };
3120 int nid[1] = { NID_secp384r1 };
3121
3122 if (SSL_set1_curves(ssl, nid, 1) != 1) {
3123 wpa_printf(MSG_INFO,
3124 "OpenSSL: Failed to set Suite B curves");
3125 return -1;
3126 }
3127
3128 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
3129 1) != 1) {
3130 wpa_printf(MSG_INFO,
3131 "OpenSSL: Failed to set Suite B sigalgs");
3132 return -1;
3133 }
3134 }
3135 #else /* OPENSSL_IS_BORINGSSL */
3136 if (!(flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) &&
3137 openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3138 wpa_printf(MSG_INFO,
3139 "OpenSSL: Failed to set openssl_ciphers '%s'",
3140 openssl_ciphers);
3141 return -1;
3142 }
3143 #endif /* OPENSSL_IS_BORINGSSL */
3144 #else /* CONFIG_SUITEB */
3145 if (openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3146 wpa_printf(MSG_INFO,
3147 "OpenSSL: Failed to set openssl_ciphers '%s'",
3148 openssl_ciphers);
3149 return -1;
3150 }
3151 #endif /* CONFIG_SUITEB */
3152
3153 if (flags & TLS_CONN_TEAP_ANON_DH) {
3154 #ifndef TEAP_DH_ANON_CS
3155 #define TEAP_DH_ANON_CS \
3156 "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:" \
3157 "ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:" \
3158 "ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:" \
3159 "DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:" \
3160 "DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:" \
3161 "DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:" \
3162 "ADH-AES256-GCM-SHA384:ADH-AES128-GCM-SHA256:" \
3163 "ADH-AES256-SHA256:ADH-AES128-SHA256:ADH-AES256-SHA:ADH-AES128-SHA"
3164 #endif
3165 static const char *cs = TEAP_DH_ANON_CS;
3166
3167 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3168 !defined(LIBRESSL_VERSION_NUMBER) && \
3169 !defined(OPENSSL_IS_BORINGSSL)
3170 /*
3171 * Need to drop to security level 0 to allow anonymous
3172 * cipher suites for EAP-TEAP.
3173 */
3174 SSL_set_security_level(conn->ssl, 0);
3175 #endif
3176
3177 wpa_printf(MSG_DEBUG,
3178 "OpenSSL: Enable cipher suites for anonymous EAP-TEAP provisioning: %s",
3179 cs);
3180 if (SSL_set_cipher_list(conn->ssl, cs) != 1) {
3181 tls_show_errors(MSG_INFO, __func__,
3182 "Cipher suite configuration failed");
3183 return -1;
3184 }
3185 }
3186
3187 return 0;
3188 }
3189
3190
tls_connection_set_verify(void * ssl_ctx,struct tls_connection * conn,int verify_peer,unsigned int flags,const u8 * session_ctx,size_t session_ctx_len)3191 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
3192 int verify_peer, unsigned int flags,
3193 const u8 *session_ctx, size_t session_ctx_len)
3194 {
3195 static int counter = 0;
3196 struct tls_data *data = ssl_ctx;
3197
3198 if (conn == NULL)
3199 return -1;
3200
3201 if (verify_peer) {
3202 conn->ca_cert_verify = 1;
3203 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
3204 SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
3205 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
3206 } else {
3207 conn->ca_cert_verify = 0;
3208 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
3209 }
3210
3211 if (tls_set_conn_flags(conn, flags, NULL) < 0)
3212 return -1;
3213 conn->flags = flags;
3214
3215 SSL_set_accept_state(conn->ssl);
3216
3217 if (data->tls_session_lifetime == 0) {
3218 /*
3219 * Set session id context to a unique value to make sure
3220 * session resumption cannot be used either through session
3221 * caching or TLS ticket extension.
3222 */
3223 counter++;
3224 SSL_set_session_id_context(conn->ssl,
3225 (const unsigned char *) &counter,
3226 sizeof(counter));
3227 } else if (session_ctx) {
3228 SSL_set_session_id_context(conn->ssl, session_ctx,
3229 session_ctx_len);
3230 }
3231
3232 return 0;
3233 }
3234
3235
tls_connection_client_cert(struct tls_connection * conn,const char * client_cert,const u8 * client_cert_blob,size_t client_cert_blob_len)3236 static int tls_connection_client_cert(struct tls_connection *conn,
3237 const char *client_cert,
3238 const u8 *client_cert_blob,
3239 size_t client_cert_blob_len)
3240 {
3241 if (client_cert == NULL && client_cert_blob == NULL)
3242 return 0;
3243
3244 #ifdef PKCS12_FUNCS
3245 #if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
3246 /*
3247 * Clear previously set extra chain certificates, if any, from PKCS#12
3248 * processing in tls_parse_pkcs12() to allow OpenSSL to build a new
3249 * chain properly.
3250 */
3251 SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx);
3252 #endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */
3253 #endif /* PKCS12_FUNCS */
3254
3255 if (client_cert_blob &&
3256 SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
3257 client_cert_blob_len) == 1) {
3258 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
3259 "OK");
3260 return 0;
3261 } else if (client_cert_blob) {
3262 tls_show_errors(MSG_DEBUG, __func__,
3263 "SSL_use_certificate_ASN1 failed");
3264 }
3265
3266 if (client_cert == NULL)
3267 return -1;
3268
3269 #ifdef ANDROID
3270 if (os_strncmp("keystore://", client_cert, 11) == 0) {
3271 BIO *bio = BIO_from_keystore(&client_cert[11]);
3272 X509 *x509 = NULL;
3273 int ret = -1;
3274 if (bio) {
3275 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3276 }
3277 if (x509) {
3278 if (SSL_use_certificate(conn->ssl, x509) == 1)
3279 ret = 0;
3280 X509_free(x509);
3281 }
3282
3283 /* Read additional certificates into the chain. */
3284 while (bio) {
3285 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3286 if (x509) {
3287 /* Takes ownership of x509 */
3288 SSL_add0_chain_cert(conn->ssl, x509);
3289 } else {
3290 BIO_free(bio);
3291 bio = NULL;
3292 }
3293 }
3294 return ret;
3295 }
3296 #endif /* ANDROID */
3297
3298 #ifndef OPENSSL_NO_STDIO
3299 if (SSL_use_certificate_file(conn->ssl, client_cert,
3300 SSL_FILETYPE_ASN1) == 1) {
3301 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
3302 " --> OK");
3303 return 0;
3304 }
3305
3306 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3307 !defined(LIBRESSL_VERSION_NUMBER) && !defined(OPENSSL_IS_BORINGSSL)
3308 if (SSL_use_certificate_chain_file(conn->ssl, client_cert) == 1) {
3309 ERR_clear_error();
3310 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_chain_file"
3311 " --> OK");
3312 return 0;
3313 }
3314 #else
3315 if (SSL_use_certificate_file(conn->ssl, client_cert,
3316 SSL_FILETYPE_PEM) == 1) {
3317 ERR_clear_error();
3318 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
3319 " --> OK");
3320 return 0;
3321 }
3322 #endif
3323
3324 tls_show_errors(MSG_DEBUG, __func__,
3325 "SSL_use_certificate_file failed");
3326 #else /* OPENSSL_NO_STDIO */
3327 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3328 #endif /* OPENSSL_NO_STDIO */
3329
3330 return -1;
3331 }
3332
3333
tls_global_client_cert(struct tls_data * data,const char * client_cert)3334 static int tls_global_client_cert(struct tls_data *data,
3335 const char *client_cert)
3336 {
3337 #ifndef OPENSSL_NO_STDIO
3338 SSL_CTX *ssl_ctx = data->ssl;
3339
3340 if (client_cert == NULL)
3341 return 0;
3342
3343 if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3344 SSL_FILETYPE_ASN1) != 1 &&
3345 SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
3346 SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3347 SSL_FILETYPE_PEM) != 1) {
3348 tls_show_errors(MSG_INFO, __func__,
3349 "Failed to load client certificate");
3350 return -1;
3351 }
3352 return 0;
3353 #else /* OPENSSL_NO_STDIO */
3354 if (client_cert == NULL)
3355 return 0;
3356 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3357 return -1;
3358 #endif /* OPENSSL_NO_STDIO */
3359 }
3360
3361
3362 #ifdef PKCS12_FUNCS
tls_parse_pkcs12(struct tls_data * data,SSL * ssl,PKCS12 * p12,const char * passwd)3363 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12,
3364 const char *passwd)
3365 {
3366 EVP_PKEY *pkey;
3367 X509 *cert;
3368 STACK_OF(X509) *certs;
3369 int res = 0;
3370 char buf[256];
3371
3372 pkey = NULL;
3373 cert = NULL;
3374 certs = NULL;
3375 if (!passwd)
3376 passwd = "";
3377 if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
3378 tls_show_errors(MSG_DEBUG, __func__,
3379 "Failed to parse PKCS12 file");
3380 PKCS12_free(p12);
3381 return -1;
3382 }
3383 wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
3384
3385 if (cert) {
3386 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3387 sizeof(buf));
3388 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
3389 "subject='%s'", buf);
3390 if (ssl) {
3391 if (SSL_use_certificate(ssl, cert) != 1)
3392 res = -1;
3393 } else {
3394 if (SSL_CTX_use_certificate(data->ssl, cert) != 1)
3395 res = -1;
3396 }
3397 X509_free(cert);
3398 }
3399
3400 if (pkey) {
3401 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
3402 if (ssl) {
3403 if (SSL_use_PrivateKey(ssl, pkey) != 1)
3404 res = -1;
3405 } else {
3406 if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1)
3407 res = -1;
3408 }
3409 EVP_PKEY_free(pkey);
3410 }
3411
3412 if (certs) {
3413 #if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
3414 if (ssl)
3415 SSL_clear_chain_certs(ssl);
3416 else
3417 SSL_CTX_clear_chain_certs(data->ssl);
3418 while ((cert = sk_X509_pop(certs)) != NULL) {
3419 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3420 sizeof(buf));
3421 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3422 " from PKCS12: subject='%s'", buf);
3423 if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) ||
3424 (!ssl && SSL_CTX_add1_chain_cert(data->ssl,
3425 cert) != 1)) {
3426 tls_show_errors(MSG_DEBUG, __func__,
3427 "Failed to add additional certificate");
3428 res = -1;
3429 X509_free(cert);
3430 break;
3431 }
3432 X509_free(cert);
3433 }
3434 if (!res) {
3435 /* Try to continue anyway */
3436 }
3437 sk_X509_pop_free(certs, X509_free);
3438 #ifndef OPENSSL_IS_BORINGSSL
3439 if (ssl)
3440 res = SSL_build_cert_chain(
3441 ssl,
3442 SSL_BUILD_CHAIN_FLAG_CHECK |
3443 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3444 else
3445 res = SSL_CTX_build_cert_chain(
3446 data->ssl,
3447 SSL_BUILD_CHAIN_FLAG_CHECK |
3448 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3449 if (!res) {
3450 tls_show_errors(MSG_DEBUG, __func__,
3451 "Failed to build certificate chain");
3452 } else if (res == 2) {
3453 wpa_printf(MSG_DEBUG,
3454 "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
3455 }
3456 #endif /* OPENSSL_IS_BORINGSSL */
3457 /*
3458 * Try to continue regardless of result since it is possible for
3459 * the extra certificates not to be required.
3460 */
3461 res = 0;
3462 #else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
3463 SSL_CTX_clear_extra_chain_certs(data->ssl);
3464 while ((cert = sk_X509_pop(certs)) != NULL) {
3465 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3466 sizeof(buf));
3467 wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3468 " from PKCS12: subject='%s'", buf);
3469 /*
3470 * There is no SSL equivalent for the chain cert - so
3471 * always add it to the context...
3472 */
3473 if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1)
3474 {
3475 X509_free(cert);
3476 res = -1;
3477 break;
3478 }
3479 }
3480 sk_X509_pop_free(certs, X509_free);
3481 #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
3482 }
3483
3484 PKCS12_free(p12);
3485
3486 if (res < 0)
3487 tls_get_errors(data);
3488
3489 return res;
3490 }
3491 #endif /* PKCS12_FUNCS */
3492
3493
tls_read_pkcs12(struct tls_data * data,SSL * ssl,const char * private_key,const char * passwd)3494 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
3495 const char *private_key, const char *passwd)
3496 {
3497 #ifdef PKCS12_FUNCS
3498 FILE *f;
3499 PKCS12 *p12;
3500
3501 f = fopen(private_key, "rb");
3502 if (f == NULL)
3503 return -1;
3504
3505 p12 = d2i_PKCS12_fp(f, NULL);
3506 fclose(f);
3507
3508 if (p12 == NULL) {
3509 tls_show_errors(MSG_INFO, __func__,
3510 "Failed to use PKCS#12 file");
3511 return -1;
3512 }
3513
3514 return tls_parse_pkcs12(data, ssl, p12, passwd);
3515
3516 #else /* PKCS12_FUNCS */
3517 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
3518 "p12/pfx files");
3519 return -1;
3520 #endif /* PKCS12_FUNCS */
3521 }
3522
3523
tls_read_pkcs12_blob(struct tls_data * data,SSL * ssl,const u8 * blob,size_t len,const char * passwd)3524 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl,
3525 const u8 *blob, size_t len, const char *passwd)
3526 {
3527 #ifdef PKCS12_FUNCS
3528 PKCS12 *p12;
3529
3530 p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
3531 if (p12 == NULL) {
3532 tls_show_errors(MSG_INFO, __func__,
3533 "Failed to use PKCS#12 blob");
3534 return -1;
3535 }
3536
3537 return tls_parse_pkcs12(data, ssl, p12, passwd);
3538
3539 #else /* PKCS12_FUNCS */
3540 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
3541 "p12/pfx blobs");
3542 return -1;
3543 #endif /* PKCS12_FUNCS */
3544 }
3545
3546
3547 #ifndef OPENSSL_NO_ENGINE
tls_engine_get_cert(struct tls_connection * conn,const char * cert_id,X509 ** cert)3548 static int tls_engine_get_cert(struct tls_connection *conn,
3549 const char *cert_id,
3550 X509 **cert)
3551 {
3552 /* this runs after the private key is loaded so no PIN is required */
3553 struct {
3554 const char *cert_id;
3555 X509 *cert;
3556 } params;
3557 params.cert_id = cert_id;
3558 params.cert = NULL;
3559
3560 if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
3561 0, ¶ms, NULL, 1)) {
3562 unsigned long err = ERR_get_error();
3563
3564 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
3565 " '%s' [%s]", cert_id,
3566 ERR_error_string(err, NULL));
3567 if (tls_is_pin_error(err))
3568 return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
3569 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3570 }
3571 if (!params.cert) {
3572 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
3573 " '%s'", cert_id);
3574 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3575 }
3576 *cert = params.cert;
3577 return 0;
3578 }
3579 #endif /* OPENSSL_NO_ENGINE */
3580
3581
tls_connection_engine_client_cert(struct tls_connection * conn,const char * cert_id)3582 static int tls_connection_engine_client_cert(struct tls_connection *conn,
3583 const char *cert_id)
3584 {
3585 #ifndef OPENSSL_NO_ENGINE
3586 X509 *cert;
3587
3588 if (tls_engine_get_cert(conn, cert_id, &cert))
3589 return -1;
3590
3591 if (!SSL_use_certificate(conn->ssl, cert)) {
3592 tls_show_errors(MSG_ERROR, __func__,
3593 "SSL_use_certificate failed");
3594 X509_free(cert);
3595 return -1;
3596 }
3597 X509_free(cert);
3598 wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
3599 "OK");
3600 return 0;
3601
3602 #else /* OPENSSL_NO_ENGINE */
3603 return -1;
3604 #endif /* OPENSSL_NO_ENGINE */
3605 }
3606
3607
tls_connection_engine_ca_cert(struct tls_data * data,struct tls_connection * conn,const char * ca_cert_id)3608 static int tls_connection_engine_ca_cert(struct tls_data *data,
3609 struct tls_connection *conn,
3610 const char *ca_cert_id)
3611 {
3612 #ifndef OPENSSL_NO_ENGINE
3613 X509 *cert;
3614 SSL_CTX *ssl_ctx = data->ssl;
3615 X509_STORE *store;
3616
3617 if (tls_engine_get_cert(conn, ca_cert_id, &cert))
3618 return -1;
3619
3620 /* start off the same as tls_connection_ca_cert */
3621 store = X509_STORE_new();
3622 if (store == NULL) {
3623 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
3624 "certificate store", __func__);
3625 X509_free(cert);
3626 return -1;
3627 }
3628 SSL_CTX_set_cert_store(ssl_ctx, store);
3629 if (!X509_STORE_add_cert(store, cert)) {
3630 unsigned long err = ERR_peek_error();
3631 tls_show_errors(MSG_WARNING, __func__,
3632 "Failed to add CA certificate from engine "
3633 "to certificate store");
3634 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
3635 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
3636 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
3637 " already in hash table error",
3638 __func__);
3639 } else {
3640 X509_free(cert);
3641 return -1;
3642 }
3643 }
3644 X509_free(cert);
3645 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
3646 "to certificate store", __func__);
3647 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
3648 conn->ca_cert_verify = 1;
3649
3650 return 0;
3651
3652 #else /* OPENSSL_NO_ENGINE */
3653 return -1;
3654 #endif /* OPENSSL_NO_ENGINE */
3655 }
3656
3657
tls_connection_engine_private_key(struct tls_connection * conn)3658 static int tls_connection_engine_private_key(struct tls_connection *conn)
3659 {
3660 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
3661 if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
3662 tls_show_errors(MSG_ERROR, __func__,
3663 "ENGINE: cannot use private key for TLS");
3664 return -1;
3665 }
3666 if (!SSL_check_private_key(conn->ssl)) {
3667 tls_show_errors(MSG_INFO, __func__,
3668 "Private key failed verification");
3669 return -1;
3670 }
3671 return 0;
3672 #else /* OPENSSL_NO_ENGINE */
3673 wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
3674 "engine support was not compiled in");
3675 return -1;
3676 #endif /* OPENSSL_NO_ENGINE */
3677 }
3678
3679
3680 #ifndef OPENSSL_NO_STDIO
tls_passwd_cb(char * buf,int size,int rwflag,void * password)3681 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
3682 {
3683 if (!password)
3684 return 0;
3685 os_strlcpy(buf, (const char *) password, size);
3686 return os_strlen(buf);
3687 }
3688 #endif /* OPENSSL_NO_STDIO */
3689
3690
tls_use_private_key_file(struct tls_data * data,SSL * ssl,const char * private_key,const char * private_key_passwd)3691 static int tls_use_private_key_file(struct tls_data *data, SSL *ssl,
3692 const char *private_key,
3693 const char *private_key_passwd)
3694 {
3695 #ifndef OPENSSL_NO_STDIO
3696 BIO *bio;
3697 EVP_PKEY *pkey;
3698 int ret;
3699
3700 /* First try ASN.1 (DER). */
3701 bio = BIO_new_file(private_key, "r");
3702 if (!bio)
3703 return -1;
3704 pkey = d2i_PrivateKey_bio(bio, NULL);
3705 BIO_free(bio);
3706
3707 if (pkey) {
3708 wpa_printf(MSG_DEBUG, "OpenSSL: %s (DER) --> loaded", __func__);
3709 } else {
3710 /* Try PEM with the provided password. */
3711 bio = BIO_new_file(private_key, "r");
3712 if (!bio)
3713 return -1;
3714 pkey = PEM_read_bio_PrivateKey(bio, NULL, tls_passwd_cb,
3715 (void *) private_key_passwd);
3716 BIO_free(bio);
3717 if (!pkey)
3718 return -1;
3719 wpa_printf(MSG_DEBUG, "OpenSSL: %s (PEM) --> loaded", __func__);
3720 /* Clear errors from the previous failed load. */
3721 ERR_clear_error();
3722 }
3723
3724 if (ssl)
3725 ret = SSL_use_PrivateKey(ssl, pkey);
3726 else
3727 ret = SSL_CTX_use_PrivateKey(data->ssl, pkey);
3728
3729 EVP_PKEY_free(pkey);
3730 return ret == 1 ? 0 : -1;
3731 #else /* OPENSSL_NO_STDIO */
3732 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3733 return -1;
3734 #endif /* OPENSSL_NO_STDIO */
3735 }
3736
3737
tls_connection_private_key(struct tls_data * data,struct tls_connection * conn,const char * private_key,const char * private_key_passwd,const u8 * private_key_blob,size_t private_key_blob_len)3738 static int tls_connection_private_key(struct tls_data *data,
3739 struct tls_connection *conn,
3740 const char *private_key,
3741 const char *private_key_passwd,
3742 const u8 *private_key_blob,
3743 size_t private_key_blob_len)
3744 {
3745 int ok;
3746
3747 if (private_key == NULL && private_key_blob == NULL)
3748 return 0;
3749
3750 ok = 0;
3751 while (private_key_blob) {
3752 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
3753 (u8 *) private_key_blob,
3754 private_key_blob_len) == 1) {
3755 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3756 "ASN1(EVP_PKEY_RSA) --> OK");
3757 ok = 1;
3758 break;
3759 }
3760
3761 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
3762 (u8 *) private_key_blob,
3763 private_key_blob_len) == 1) {
3764 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3765 "ASN1(EVP_PKEY_DSA) --> OK");
3766 ok = 1;
3767 break;
3768 }
3769
3770 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
3771 (u8 *) private_key_blob,
3772 private_key_blob_len) == 1) {
3773 wpa_printf(MSG_DEBUG, "OpenSSL: "
3774 "SSL_use_RSAPrivateKey_ASN1 --> OK");
3775 ok = 1;
3776 break;
3777 }
3778
3779 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob,
3780 private_key_blob_len,
3781 private_key_passwd) == 0) {
3782 wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
3783 "OK");
3784 ok = 1;
3785 break;
3786 }
3787
3788 break;
3789 }
3790
3791 while (!ok && private_key) {
3792 if (tls_use_private_key_file(data, conn->ssl, private_key,
3793 private_key_passwd) == 0) {
3794 ok = 1;
3795 break;
3796 }
3797
3798 if (tls_read_pkcs12(data, conn->ssl, private_key,
3799 private_key_passwd) == 0) {
3800 wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
3801 "--> OK");
3802 ok = 1;
3803 break;
3804 }
3805
3806 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
3807 wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
3808 "access certificate store --> OK");
3809 ok = 1;
3810 break;
3811 }
3812
3813 break;
3814 }
3815
3816 if (!ok) {
3817 tls_show_errors(MSG_INFO, __func__,
3818 "Failed to load private key");
3819 return -1;
3820 }
3821 ERR_clear_error();
3822
3823 if (!SSL_check_private_key(conn->ssl)) {
3824 tls_show_errors(MSG_INFO, __func__, "Private key failed "
3825 "verification");
3826 return -1;
3827 }
3828
3829 wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
3830 return 0;
3831 }
3832
3833
tls_global_private_key(struct tls_data * data,const char * private_key,const char * private_key_passwd)3834 static int tls_global_private_key(struct tls_data *data,
3835 const char *private_key,
3836 const char *private_key_passwd)
3837 {
3838 SSL_CTX *ssl_ctx = data->ssl;
3839
3840 if (private_key == NULL)
3841 return 0;
3842
3843 if (tls_use_private_key_file(data, NULL, private_key,
3844 private_key_passwd) &&
3845 tls_read_pkcs12(data, NULL, private_key, private_key_passwd)) {
3846 tls_show_errors(MSG_INFO, __func__,
3847 "Failed to load private key");
3848 ERR_clear_error();
3849 return -1;
3850 }
3851 ERR_clear_error();
3852
3853 if (!SSL_CTX_check_private_key(ssl_ctx)) {
3854 tls_show_errors(MSG_INFO, __func__,
3855 "Private key failed verification");
3856 return -1;
3857 }
3858
3859 return 0;
3860 }
3861
3862
tls_connection_dh(struct tls_connection * conn,const char * dh_file)3863 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
3864 {
3865 #ifdef OPENSSL_NO_DH
3866 if (dh_file == NULL)
3867 return 0;
3868 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
3869 "dh_file specified");
3870 return -1;
3871 #else /* OPENSSL_NO_DH */
3872 DH *dh;
3873 BIO *bio;
3874
3875 /* TODO: add support for dh_blob */
3876 if (dh_file == NULL)
3877 return 0;
3878 if (conn == NULL)
3879 return -1;
3880
3881 bio = BIO_new_file(dh_file, "r");
3882 if (bio == NULL) {
3883 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
3884 dh_file, ERR_error_string(ERR_get_error(), NULL));
3885 return -1;
3886 }
3887 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
3888 BIO_free(bio);
3889 #ifndef OPENSSL_NO_DSA
3890 while (dh == NULL) {
3891 DSA *dsa;
3892 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
3893 " trying to parse as DSA params", dh_file,
3894 ERR_error_string(ERR_get_error(), NULL));
3895 bio = BIO_new_file(dh_file, "r");
3896 if (bio == NULL)
3897 break;
3898 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
3899 BIO_free(bio);
3900 if (!dsa) {
3901 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
3902 "'%s': %s", dh_file,
3903 ERR_error_string(ERR_get_error(), NULL));
3904 break;
3905 }
3906
3907 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
3908 dh = DSA_dup_DH(dsa);
3909 DSA_free(dsa);
3910 if (dh == NULL) {
3911 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
3912 "params into DH params");
3913 break;
3914 }
3915 break;
3916 }
3917 #endif /* !OPENSSL_NO_DSA */
3918 if (dh == NULL) {
3919 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
3920 "'%s'", dh_file);
3921 return -1;
3922 }
3923
3924 if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
3925 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
3926 "%s", dh_file,
3927 ERR_error_string(ERR_get_error(), NULL));
3928 DH_free(dh);
3929 return -1;
3930 }
3931 DH_free(dh);
3932 return 0;
3933 #endif /* OPENSSL_NO_DH */
3934 }
3935
3936
tls_global_dh(struct tls_data * data,const char * dh_file)3937 static int tls_global_dh(struct tls_data *data, const char *dh_file)
3938 {
3939 #ifdef OPENSSL_NO_DH
3940 if (dh_file == NULL)
3941 return 0;
3942 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
3943 "dh_file specified");
3944 return -1;
3945 #else /* OPENSSL_NO_DH */
3946 SSL_CTX *ssl_ctx = data->ssl;
3947 DH *dh;
3948 BIO *bio;
3949
3950 /* TODO: add support for dh_blob */
3951 if (dh_file == NULL)
3952 return 0;
3953 if (ssl_ctx == NULL)
3954 return -1;
3955
3956 bio = BIO_new_file(dh_file, "r");
3957 if (bio == NULL) {
3958 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
3959 dh_file, ERR_error_string(ERR_get_error(), NULL));
3960 return -1;
3961 }
3962 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
3963 BIO_free(bio);
3964 #ifndef OPENSSL_NO_DSA
3965 while (dh == NULL) {
3966 DSA *dsa;
3967 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
3968 " trying to parse as DSA params", dh_file,
3969 ERR_error_string(ERR_get_error(), NULL));
3970 bio = BIO_new_file(dh_file, "r");
3971 if (bio == NULL)
3972 break;
3973 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
3974 BIO_free(bio);
3975 if (!dsa) {
3976 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
3977 "'%s': %s", dh_file,
3978 ERR_error_string(ERR_get_error(), NULL));
3979 break;
3980 }
3981
3982 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
3983 dh = DSA_dup_DH(dsa);
3984 DSA_free(dsa);
3985 if (dh == NULL) {
3986 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
3987 "params into DH params");
3988 break;
3989 }
3990 break;
3991 }
3992 #endif /* !OPENSSL_NO_DSA */
3993 if (dh == NULL) {
3994 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
3995 "'%s'", dh_file);
3996 return -1;
3997 }
3998
3999 if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
4000 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
4001 "%s", dh_file,
4002 ERR_error_string(ERR_get_error(), NULL));
4003 DH_free(dh);
4004 return -1;
4005 }
4006 DH_free(dh);
4007 return 0;
4008 #endif /* OPENSSL_NO_DH */
4009 }
4010
4011
tls_connection_get_random(void * ssl_ctx,struct tls_connection * conn,struct tls_random * keys)4012 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
4013 struct tls_random *keys)
4014 {
4015 SSL *ssl;
4016
4017 if (conn == NULL || keys == NULL)
4018 return -1;
4019 ssl = conn->ssl;
4020 if (ssl == NULL)
4021 return -1;
4022
4023 os_memset(keys, 0, sizeof(*keys));
4024 keys->client_random = conn->client_random;
4025 keys->client_random_len = SSL_get_client_random(
4026 ssl, conn->client_random, sizeof(conn->client_random));
4027 keys->server_random = conn->server_random;
4028 keys->server_random_len = SSL_get_server_random(
4029 ssl, conn->server_random, sizeof(conn->server_random));
4030
4031 return 0;
4032 }
4033
4034
4035 #ifdef OPENSSL_NEED_EAP_FAST_PRF
openssl_get_keyblock_size(SSL * ssl)4036 static int openssl_get_keyblock_size(SSL *ssl)
4037 {
4038 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
4039 (defined(LIBRESSL_VERSION_NUMBER) && \
4040 LIBRESSL_VERSION_NUMBER < 0x20700000L)
4041 const EVP_CIPHER *c;
4042 const EVP_MD *h;
4043 int md_size;
4044
4045 if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
4046 ssl->read_hash == NULL)
4047 return -1;
4048
4049 c = ssl->enc_read_ctx->cipher;
4050 h = EVP_MD_CTX_md(ssl->read_hash);
4051 if (h)
4052 md_size = EVP_MD_size(h);
4053 else if (ssl->s3)
4054 md_size = ssl->s3->tmp.new_mac_secret_size;
4055 else
4056 return -1;
4057
4058 wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
4059 "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
4060 EVP_CIPHER_iv_length(c));
4061 return 2 * (EVP_CIPHER_key_length(c) +
4062 md_size +
4063 EVP_CIPHER_iv_length(c));
4064 #else
4065 const SSL_CIPHER *ssl_cipher;
4066 int cipher, digest;
4067 const EVP_CIPHER *c;
4068 const EVP_MD *h;
4069 int mac_key_len, enc_key_len, fixed_iv_len;
4070
4071 ssl_cipher = SSL_get_current_cipher(ssl);
4072 if (!ssl_cipher)
4073 return -1;
4074 cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
4075 digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
4076 wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
4077 cipher, digest);
4078 if (cipher < 0 || digest < 0)
4079 return -1;
4080 if (cipher == NID_undef) {
4081 wpa_printf(MSG_DEBUG, "OpenSSL: no cipher in use?!");
4082 return -1;
4083 }
4084 c = EVP_get_cipherbynid(cipher);
4085 if (!c)
4086 return -1;
4087 enc_key_len = EVP_CIPHER_key_length(c);
4088 if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE ||
4089 EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
4090 fixed_iv_len = 4; /* only part of IV from PRF */
4091 else
4092 fixed_iv_len = EVP_CIPHER_iv_length(c);
4093 if (digest == NID_undef) {
4094 wpa_printf(MSG_DEBUG, "OpenSSL: no digest in use (e.g., AEAD)");
4095 mac_key_len = 0;
4096 } else {
4097 h = EVP_get_digestbynid(digest);
4098 if (!h)
4099 return -1;
4100 mac_key_len = EVP_MD_size(h);
4101 }
4102
4103 wpa_printf(MSG_DEBUG,
4104 "OpenSSL: keyblock size: mac_key_len=%d enc_key_len=%d fixed_iv_len=%d",
4105 mac_key_len, enc_key_len, fixed_iv_len);
4106 return 2 * (mac_key_len + enc_key_len + fixed_iv_len);
4107 #endif
4108 }
4109 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
4110
4111
tls_connection_export_key(void * tls_ctx,struct tls_connection * conn,const char * label,const u8 * context,size_t context_len,u8 * out,size_t out_len)4112 int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
4113 const char *label, const u8 *context,
4114 size_t context_len, u8 *out, size_t out_len)
4115 {
4116 if (!conn ||
4117 SSL_export_keying_material(conn->ssl, out, out_len, label,
4118 os_strlen(label), context, context_len,
4119 context != NULL) != 1)
4120 return -1;
4121 return 0;
4122 }
4123
4124
tls_connection_get_eap_fast_key(void * tls_ctx,struct tls_connection * conn,u8 * out,size_t out_len)4125 int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
4126 u8 *out, size_t out_len)
4127 {
4128 #ifdef OPENSSL_NEED_EAP_FAST_PRF
4129 SSL *ssl;
4130 SSL_SESSION *sess;
4131 u8 *rnd;
4132 int ret = -1;
4133 int skip = 0;
4134 u8 *tmp_out = NULL;
4135 u8 *_out = out;
4136 unsigned char client_random[SSL3_RANDOM_SIZE];
4137 unsigned char server_random[SSL3_RANDOM_SIZE];
4138 unsigned char master_key[64];
4139 size_t master_key_len;
4140 const char *ver;
4141
4142 /*
4143 * TLS library did not support EAP-FAST key generation, so get the
4144 * needed TLS session parameters and use an internal implementation of
4145 * TLS PRF to derive the key.
4146 */
4147
4148 if (conn == NULL)
4149 return -1;
4150 ssl = conn->ssl;
4151 if (ssl == NULL)
4152 return -1;
4153 ver = SSL_get_version(ssl);
4154 sess = SSL_get_session(ssl);
4155 if (!ver || !sess)
4156 return -1;
4157
4158 skip = openssl_get_keyblock_size(ssl);
4159 if (skip < 0)
4160 return -1;
4161 tmp_out = os_malloc(skip + out_len);
4162 if (!tmp_out)
4163 return -1;
4164 _out = tmp_out;
4165
4166 rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
4167 if (!rnd) {
4168 os_free(tmp_out);
4169 return -1;
4170 }
4171
4172 SSL_get_client_random(ssl, client_random, sizeof(client_random));
4173 SSL_get_server_random(ssl, server_random, sizeof(server_random));
4174 master_key_len = SSL_SESSION_get_master_key(sess, master_key,
4175 sizeof(master_key));
4176
4177 os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
4178 os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random, SSL3_RANDOM_SIZE);
4179
4180 if (os_strcmp(ver, "TLSv1.2") == 0) {
4181 tls_prf_sha256(master_key, master_key_len,
4182 "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
4183 _out, skip + out_len);
4184 ret = 0;
4185 } else if (tls_prf_sha1_md5(master_key, master_key_len,
4186 "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
4187 _out, skip + out_len) == 0) {
4188 ret = 0;
4189 }
4190 forced_memzero(master_key, sizeof(master_key));
4191 os_free(rnd);
4192 if (ret == 0)
4193 os_memcpy(out, _out + skip, out_len);
4194 bin_clear_free(tmp_out, skip);
4195
4196 return ret;
4197 #else /* OPENSSL_NEED_EAP_FAST_PRF */
4198 wpa_printf(MSG_ERROR,
4199 "OpenSSL: EAP-FAST keys cannot be exported in FIPS mode");
4200 return -1;
4201 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
4202 }
4203
4204
4205 static struct wpabuf *
openssl_handshake(struct tls_connection * conn,const struct wpabuf * in_data)4206 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data)
4207 {
4208 int res;
4209 struct wpabuf *out_data;
4210
4211 /*
4212 * Give TLS handshake data from the server (if available) to OpenSSL
4213 * for processing.
4214 */
4215 if (in_data && wpabuf_len(in_data) > 0 &&
4216 BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
4217 < 0) {
4218 tls_show_errors(MSG_INFO, __func__,
4219 "Handshake failed - BIO_write");
4220 return NULL;
4221 }
4222
4223 /* Initiate TLS handshake or continue the existing handshake */
4224 if (conn->server)
4225 res = SSL_accept(conn->ssl);
4226 else
4227 res = SSL_connect(conn->ssl);
4228 if (res != 1) {
4229 int err = SSL_get_error(conn->ssl, res);
4230 if (err == SSL_ERROR_WANT_READ)
4231 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
4232 "more data");
4233 else if (err == SSL_ERROR_WANT_WRITE)
4234 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
4235 "write");
4236 else {
4237 tls_show_errors(MSG_INFO, __func__, "SSL_connect");
4238 conn->failed++;
4239 if (!conn->server && !conn->client_hello_generated) {
4240 /* The server would not understand TLS Alert
4241 * before ClientHello, so simply terminate
4242 * handshake on this type of error case caused
4243 * by a likely internal error like no ciphers
4244 * available. */
4245 wpa_printf(MSG_DEBUG,
4246 "OpenSSL: Could not generate ClientHello");
4247 conn->write_alerts++;
4248 return NULL;
4249 }
4250 }
4251 }
4252
4253 if (!conn->server && !conn->failed)
4254 conn->client_hello_generated = 1;
4255
4256 #ifdef CONFIG_SUITEB
4257 if ((conn->flags & TLS_CONN_SUITEB) && !conn->server &&
4258 os_strncmp(SSL_get_cipher(conn->ssl), "DHE-", 4) == 0 &&
4259 conn->server_dh_prime_len < 3072) {
4260 struct tls_context *context = conn->context;
4261
4262 /*
4263 * This should not be reached since earlier cert_cb should have
4264 * terminated the handshake. Keep this check here for extra
4265 * protection if anything goes wrong with the more low-level
4266 * checks based on having to parse the TLS handshake messages.
4267 */
4268 wpa_printf(MSG_DEBUG,
4269 "OpenSSL: Server DH prime length: %d bits",
4270 conn->server_dh_prime_len);
4271
4272 if (context->event_cb) {
4273 union tls_event_data ev;
4274
4275 os_memset(&ev, 0, sizeof(ev));
4276 ev.alert.is_local = 1;
4277 ev.alert.type = "fatal";
4278 ev.alert.description = "insufficient security";
4279 context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
4280 }
4281 /*
4282 * Could send a TLS Alert to the server, but for now, simply
4283 * terminate handshake.
4284 */
4285 conn->failed++;
4286 conn->write_alerts++;
4287 return NULL;
4288 }
4289 #endif /* CONFIG_SUITEB */
4290
4291 /* Get the TLS handshake data to be sent to the server */
4292 res = BIO_ctrl_pending(conn->ssl_out);
4293 wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
4294 out_data = wpabuf_alloc(res);
4295 if (out_data == NULL) {
4296 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
4297 "handshake output (%d bytes)", res);
4298 if (BIO_reset(conn->ssl_out) < 0) {
4299 tls_show_errors(MSG_INFO, __func__,
4300 "BIO_reset failed");
4301 }
4302 return NULL;
4303 }
4304 res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
4305 res);
4306 if (res < 0) {
4307 tls_show_errors(MSG_INFO, __func__,
4308 "Handshake failed - BIO_read");
4309 if (BIO_reset(conn->ssl_out) < 0) {
4310 tls_show_errors(MSG_INFO, __func__,
4311 "BIO_reset failed");
4312 }
4313 wpabuf_free(out_data);
4314 return NULL;
4315 }
4316 wpabuf_put(out_data, res);
4317
4318 return out_data;
4319 }
4320
4321
4322 static struct wpabuf *
openssl_get_appl_data(struct tls_connection * conn,size_t max_len)4323 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
4324 {
4325 struct wpabuf *appl_data;
4326 int res;
4327
4328 appl_data = wpabuf_alloc(max_len + 100);
4329 if (appl_data == NULL)
4330 return NULL;
4331
4332 res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
4333 wpabuf_size(appl_data));
4334 if (res < 0) {
4335 int err = SSL_get_error(conn->ssl, res);
4336 if (err == SSL_ERROR_WANT_READ ||
4337 err == SSL_ERROR_WANT_WRITE) {
4338 wpa_printf(MSG_DEBUG, "SSL: No Application Data "
4339 "included");
4340 } else {
4341 tls_show_errors(MSG_INFO, __func__,
4342 "Failed to read possible "
4343 "Application Data");
4344 }
4345 wpabuf_free(appl_data);
4346 return NULL;
4347 }
4348
4349 wpabuf_put(appl_data, res);
4350 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
4351 "message", appl_data);
4352
4353 return appl_data;
4354 }
4355
4356
4357 static struct wpabuf *
openssl_connection_handshake(struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4358 openssl_connection_handshake(struct tls_connection *conn,
4359 const struct wpabuf *in_data,
4360 struct wpabuf **appl_data)
4361 {
4362 struct wpabuf *out_data;
4363
4364 if (appl_data)
4365 *appl_data = NULL;
4366
4367 out_data = openssl_handshake(conn, in_data);
4368 if (out_data == NULL)
4369 return NULL;
4370 if (conn->invalid_hb_used) {
4371 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4372 wpabuf_free(out_data);
4373 return NULL;
4374 }
4375
4376 if (SSL_is_init_finished(conn->ssl)) {
4377 wpa_printf(MSG_DEBUG,
4378 "OpenSSL: Handshake finished - resumed=%d",
4379 tls_connection_resumed(conn->ssl_ctx, conn));
4380 if (conn->server) {
4381 char *buf;
4382 size_t buflen = 2000;
4383
4384 buf = os_malloc(buflen);
4385 if (buf) {
4386 if (SSL_get_shared_ciphers(conn->ssl, buf,
4387 buflen)) {
4388 buf[buflen - 1] = '\0';
4389 wpa_printf(MSG_DEBUG,
4390 "OpenSSL: Shared ciphers: %s",
4391 buf);
4392 }
4393 os_free(buf);
4394 }
4395 }
4396 if (appl_data && in_data)
4397 *appl_data = openssl_get_appl_data(conn,
4398 wpabuf_len(in_data));
4399 }
4400
4401 if (conn->invalid_hb_used) {
4402 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4403 if (appl_data) {
4404 wpabuf_free(*appl_data);
4405 *appl_data = NULL;
4406 }
4407 wpabuf_free(out_data);
4408 return NULL;
4409 }
4410
4411 return out_data;
4412 }
4413
4414
4415 struct wpabuf *
tls_connection_handshake(void * ssl_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4416 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
4417 const struct wpabuf *in_data,
4418 struct wpabuf **appl_data)
4419 {
4420 return openssl_connection_handshake(conn, in_data, appl_data);
4421 }
4422
4423
tls_connection_server_handshake(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data,struct wpabuf ** appl_data)4424 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
4425 struct tls_connection *conn,
4426 const struct wpabuf *in_data,
4427 struct wpabuf **appl_data)
4428 {
4429 conn->server = 1;
4430 return openssl_connection_handshake(conn, in_data, appl_data);
4431 }
4432
4433
tls_connection_encrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)4434 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
4435 struct tls_connection *conn,
4436 const struct wpabuf *in_data)
4437 {
4438 int res;
4439 struct wpabuf *buf;
4440
4441 if (conn == NULL)
4442 return NULL;
4443
4444 /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
4445 if ((res = BIO_reset(conn->ssl_in)) < 0 ||
4446 (res = BIO_reset(conn->ssl_out)) < 0) {
4447 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4448 return NULL;
4449 }
4450 res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
4451 if (res < 0) {
4452 tls_show_errors(MSG_INFO, __func__,
4453 "Encryption failed - SSL_write");
4454 return NULL;
4455 }
4456
4457 /* Read encrypted data to be sent to the server */
4458 buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
4459 if (buf == NULL)
4460 return NULL;
4461 res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
4462 if (res < 0) {
4463 tls_show_errors(MSG_INFO, __func__,
4464 "Encryption failed - BIO_read");
4465 wpabuf_free(buf);
4466 return NULL;
4467 }
4468 wpabuf_put(buf, res);
4469
4470 return buf;
4471 }
4472
4473
tls_connection_decrypt(void * tls_ctx,struct tls_connection * conn,const struct wpabuf * in_data)4474 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
4475 struct tls_connection *conn,
4476 const struct wpabuf *in_data)
4477 {
4478 int res;
4479 struct wpabuf *buf;
4480
4481 /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
4482 res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
4483 wpabuf_len(in_data));
4484 if (res < 0) {
4485 tls_show_errors(MSG_INFO, __func__,
4486 "Decryption failed - BIO_write");
4487 return NULL;
4488 }
4489 if (BIO_reset(conn->ssl_out) < 0) {
4490 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4491 return NULL;
4492 }
4493
4494 /* Read decrypted data for further processing */
4495 /*
4496 * Even though we try to disable TLS compression, it is possible that
4497 * this cannot be done with all TLS libraries. Add extra buffer space
4498 * to handle the possibility of the decrypted data being longer than
4499 * input data.
4500 */
4501 buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
4502 if (buf == NULL)
4503 return NULL;
4504 res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
4505 if (res < 0) {
4506 tls_show_errors(MSG_INFO, __func__,
4507 "Decryption failed - SSL_read");
4508 wpabuf_free(buf);
4509 return NULL;
4510 }
4511 wpabuf_put(buf, res);
4512
4513 if (conn->invalid_hb_used) {
4514 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4515 wpabuf_free(buf);
4516 return NULL;
4517 }
4518
4519 return buf;
4520 }
4521
4522
tls_connection_resumed(void * ssl_ctx,struct tls_connection * conn)4523 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
4524 {
4525 return conn ? SSL_session_reused(conn->ssl) : 0;
4526 }
4527
4528
tls_connection_set_cipher_list(void * tls_ctx,struct tls_connection * conn,u8 * ciphers)4529 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
4530 u8 *ciphers)
4531 {
4532 char buf[500], *pos, *end;
4533 u8 *c;
4534 int ret;
4535
4536 if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
4537 return -1;
4538
4539 buf[0] = '\0';
4540 pos = buf;
4541 end = pos + sizeof(buf);
4542
4543 c = ciphers;
4544 while (*c != TLS_CIPHER_NONE) {
4545 const char *suite;
4546
4547 switch (*c) {
4548 case TLS_CIPHER_RC4_SHA:
4549 suite = "RC4-SHA";
4550 break;
4551 case TLS_CIPHER_AES128_SHA:
4552 suite = "AES128-SHA";
4553 break;
4554 case TLS_CIPHER_RSA_DHE_AES128_SHA:
4555 suite = "DHE-RSA-AES128-SHA";
4556 break;
4557 case TLS_CIPHER_ANON_DH_AES128_SHA:
4558 suite = "ADH-AES128-SHA";
4559 break;
4560 case TLS_CIPHER_RSA_DHE_AES256_SHA:
4561 suite = "DHE-RSA-AES256-SHA";
4562 break;
4563 case TLS_CIPHER_AES256_SHA:
4564 suite = "AES256-SHA";
4565 break;
4566 default:
4567 wpa_printf(MSG_DEBUG, "TLS: Unsupported "
4568 "cipher selection: %d", *c);
4569 return -1;
4570 }
4571 ret = os_snprintf(pos, end - pos, ":%s", suite);
4572 if (os_snprintf_error(end - pos, ret))
4573 break;
4574 pos += ret;
4575
4576 c++;
4577 }
4578 if (!buf[0]) {
4579 wpa_printf(MSG_DEBUG, "OpenSSL: No ciphers listed");
4580 return -1;
4581 }
4582
4583 wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
4584
4585 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
4586 #ifdef EAP_FAST_OR_TEAP
4587 if (os_strstr(buf, ":ADH-")) {
4588 /*
4589 * Need to drop to security level 0 to allow anonymous
4590 * cipher suites for EAP-FAST.
4591 */
4592 SSL_set_security_level(conn->ssl, 0);
4593 } else if (SSL_get_security_level(conn->ssl) == 0) {
4594 /* Force at least security level 1 */
4595 SSL_set_security_level(conn->ssl, 1);
4596 }
4597 #endif /* EAP_FAST_OR_TEAP */
4598 #endif
4599
4600 if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
4601 tls_show_errors(MSG_INFO, __func__,
4602 "Cipher suite configuration failed");
4603 return -1;
4604 }
4605
4606 return 0;
4607 }
4608
4609
tls_get_version(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)4610 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
4611 char *buf, size_t buflen)
4612 {
4613 const char *name;
4614 if (conn == NULL || conn->ssl == NULL)
4615 return -1;
4616
4617 name = SSL_get_version(conn->ssl);
4618 if (name == NULL)
4619 return -1;
4620
4621 os_strlcpy(buf, name, buflen);
4622 return 0;
4623 }
4624
4625
tls_get_cipher(void * ssl_ctx,struct tls_connection * conn,char * buf,size_t buflen)4626 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
4627 char *buf, size_t buflen)
4628 {
4629 const char *name;
4630 if (conn == NULL || conn->ssl == NULL)
4631 return -1;
4632
4633 name = SSL_get_cipher(conn->ssl);
4634 if (name == NULL)
4635 return -1;
4636
4637 os_strlcpy(buf, name, buflen);
4638 return 0;
4639 }
4640
4641
tls_connection_enable_workaround(void * ssl_ctx,struct tls_connection * conn)4642 int tls_connection_enable_workaround(void *ssl_ctx,
4643 struct tls_connection *conn)
4644 {
4645 SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
4646
4647 return 0;
4648 }
4649
4650
4651 #ifdef EAP_FAST_OR_TEAP
4652 /* ClientHello TLS extensions require a patch to openssl, so this function is
4653 * commented out unless explicitly needed for EAP-FAST in order to be able to
4654 * build this file with unmodified openssl. */
tls_connection_client_hello_ext(void * ssl_ctx,struct tls_connection * conn,int ext_type,const u8 * data,size_t data_len)4655 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
4656 int ext_type, const u8 *data,
4657 size_t data_len)
4658 {
4659 if (conn == NULL || conn->ssl == NULL || ext_type != 35)
4660 return -1;
4661
4662 if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
4663 data_len) != 1)
4664 return -1;
4665
4666 return 0;
4667 }
4668 #endif /* EAP_FAST_OR_TEAP */
4669
4670
tls_connection_get_failed(void * ssl_ctx,struct tls_connection * conn)4671 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
4672 {
4673 if (conn == NULL)
4674 return -1;
4675 return conn->failed;
4676 }
4677
4678
tls_connection_get_read_alerts(void * ssl_ctx,struct tls_connection * conn)4679 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
4680 {
4681 if (conn == NULL)
4682 return -1;
4683 return conn->read_alerts;
4684 }
4685
4686
tls_connection_get_write_alerts(void * ssl_ctx,struct tls_connection * conn)4687 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
4688 {
4689 if (conn == NULL)
4690 return -1;
4691 return conn->write_alerts;
4692 }
4693
4694
4695 #ifdef HAVE_OCSP
4696
ocsp_debug_print_resp(OCSP_RESPONSE * rsp)4697 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
4698 {
4699 #ifndef CONFIG_NO_STDOUT_DEBUG
4700 BIO *out;
4701 size_t rlen;
4702 char *txt;
4703 int res;
4704
4705 if (wpa_debug_level > MSG_DEBUG)
4706 return;
4707
4708 out = BIO_new(BIO_s_mem());
4709 if (!out)
4710 return;
4711
4712 OCSP_RESPONSE_print(out, rsp, 0);
4713 rlen = BIO_ctrl_pending(out);
4714 txt = os_malloc(rlen + 1);
4715 if (!txt) {
4716 BIO_free(out);
4717 return;
4718 }
4719
4720 res = BIO_read(out, txt, rlen);
4721 if (res > 0) {
4722 txt[res] = '\0';
4723 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
4724 }
4725 os_free(txt);
4726 BIO_free(out);
4727 #endif /* CONFIG_NO_STDOUT_DEBUG */
4728 }
4729
4730
ocsp_resp_cb(SSL * s,void * arg)4731 static int ocsp_resp_cb(SSL *s, void *arg)
4732 {
4733 struct tls_connection *conn = arg;
4734 const unsigned char *p;
4735 int len, status, reason, res;
4736 OCSP_RESPONSE *rsp;
4737 OCSP_BASICRESP *basic;
4738 OCSP_CERTID *id;
4739 ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
4740 X509_STORE *store;
4741 STACK_OF(X509) *certs = NULL;
4742
4743 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
4744 if (!p) {
4745 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
4746 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
4747 }
4748
4749 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
4750
4751 rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
4752 if (!rsp) {
4753 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
4754 return 0;
4755 }
4756
4757 ocsp_debug_print_resp(rsp);
4758
4759 status = OCSP_response_status(rsp);
4760 if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
4761 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
4762 status, OCSP_response_status_str(status));
4763 return 0;
4764 }
4765
4766 basic = OCSP_response_get1_basic(rsp);
4767 if (!basic) {
4768 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
4769 return 0;
4770 }
4771
4772 store = SSL_CTX_get_cert_store(conn->ssl_ctx);
4773 if (conn->peer_issuer) {
4774 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
4775
4776 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
4777 tls_show_errors(MSG_INFO, __func__,
4778 "OpenSSL: Could not add issuer to certificate store");
4779 }
4780 certs = sk_X509_new_null();
4781 if (certs) {
4782 X509 *cert;
4783 cert = X509_dup(conn->peer_issuer);
4784 if (cert && !sk_X509_push(certs, cert)) {
4785 tls_show_errors(
4786 MSG_INFO, __func__,
4787 "OpenSSL: Could not add issuer to OCSP responder trust store");
4788 X509_free(cert);
4789 sk_X509_free(certs);
4790 certs = NULL;
4791 }
4792 if (certs && conn->peer_issuer_issuer) {
4793 cert = X509_dup(conn->peer_issuer_issuer);
4794 if (cert && !sk_X509_push(certs, cert)) {
4795 tls_show_errors(
4796 MSG_INFO, __func__,
4797 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
4798 X509_free(cert);
4799 }
4800 }
4801 }
4802 }
4803
4804 status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
4805 sk_X509_pop_free(certs, X509_free);
4806 if (status <= 0) {
4807 tls_show_errors(MSG_INFO, __func__,
4808 "OpenSSL: OCSP response failed verification");
4809 OCSP_BASICRESP_free(basic);
4810 OCSP_RESPONSE_free(rsp);
4811 return 0;
4812 }
4813
4814 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
4815
4816 if (!conn->peer_cert) {
4817 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
4818 OCSP_BASICRESP_free(basic);
4819 OCSP_RESPONSE_free(rsp);
4820 return 0;
4821 }
4822
4823 if (!conn->peer_issuer) {
4824 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
4825 OCSP_BASICRESP_free(basic);
4826 OCSP_RESPONSE_free(rsp);
4827 return 0;
4828 }
4829
4830 id = OCSP_cert_to_id(EVP_sha256(), conn->peer_cert, conn->peer_issuer);
4831 if (!id) {
4832 wpa_printf(MSG_DEBUG,
4833 "OpenSSL: Could not create OCSP certificate identifier (SHA256)");
4834 OCSP_BASICRESP_free(basic);
4835 OCSP_RESPONSE_free(rsp);
4836 return 0;
4837 }
4838
4839 res = OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
4840 &this_update, &next_update);
4841 if (!res) {
4842 OCSP_CERTID_free(id);
4843 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
4844 if (!id) {
4845 wpa_printf(MSG_DEBUG,
4846 "OpenSSL: Could not create OCSP certificate identifier (SHA1)");
4847 OCSP_BASICRESP_free(basic);
4848 OCSP_RESPONSE_free(rsp);
4849 return 0;
4850 }
4851
4852 res = OCSP_resp_find_status(basic, id, &status, &reason,
4853 &produced_at, &this_update,
4854 &next_update);
4855 }
4856
4857 if (!res) {
4858 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
4859 (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
4860 " (OCSP not required)");
4861 OCSP_CERTID_free(id);
4862 OCSP_BASICRESP_free(basic);
4863 OCSP_RESPONSE_free(rsp);
4864 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
4865 }
4866 OCSP_CERTID_free(id);
4867
4868 if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
4869 tls_show_errors(MSG_INFO, __func__,
4870 "OpenSSL: OCSP status times invalid");
4871 OCSP_BASICRESP_free(basic);
4872 OCSP_RESPONSE_free(rsp);
4873 return 0;
4874 }
4875
4876 OCSP_BASICRESP_free(basic);
4877 OCSP_RESPONSE_free(rsp);
4878
4879 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
4880 OCSP_cert_status_str(status));
4881
4882 if (status == V_OCSP_CERTSTATUS_GOOD)
4883 return 1;
4884 if (status == V_OCSP_CERTSTATUS_REVOKED)
4885 return 0;
4886 if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
4887 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
4888 return 0;
4889 }
4890 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
4891 return 1;
4892 }
4893
4894
ocsp_status_cb(SSL * s,void * arg)4895 static int ocsp_status_cb(SSL *s, void *arg)
4896 {
4897 char *tmp;
4898 char *resp;
4899 size_t len;
4900
4901 if (tls_global->ocsp_stapling_response == NULL) {
4902 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
4903 return SSL_TLSEXT_ERR_OK;
4904 }
4905
4906 resp = os_readfile(tls_global->ocsp_stapling_response, &len);
4907 if (resp == NULL) {
4908 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
4909 /* TODO: Build OCSPResponse with responseStatus = internalError
4910 */
4911 return SSL_TLSEXT_ERR_OK;
4912 }
4913 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
4914 tmp = OPENSSL_malloc(len);
4915 if (tmp == NULL) {
4916 os_free(resp);
4917 return SSL_TLSEXT_ERR_ALERT_FATAL;
4918 }
4919
4920 os_memcpy(tmp, resp, len);
4921 os_free(resp);
4922 SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
4923
4924 return SSL_TLSEXT_ERR_OK;
4925 }
4926
4927 #endif /* HAVE_OCSP */
4928
4929
max_str_len(const char ** lines)4930 static size_t max_str_len(const char **lines)
4931 {
4932 const char **p;
4933 size_t max_len = 0;
4934
4935 for (p = lines; *p; p++) {
4936 size_t len = os_strlen(*p);
4937
4938 if (len > max_len)
4939 max_len = len;
4940 }
4941
4942 return max_len;
4943 }
4944
4945
match_lines_in_file(const char * path,const char ** lines)4946 static int match_lines_in_file(const char *path, const char **lines)
4947 {
4948 FILE *f;
4949 char *buf;
4950 size_t bufsize;
4951 int found = 0, is_linestart = 1;
4952
4953 bufsize = max_str_len(lines) + sizeof("\r\n");
4954 buf = os_malloc(bufsize);
4955 if (!buf)
4956 return 0;
4957
4958 f = fopen(path, "r");
4959 if (!f) {
4960 os_free(buf);
4961 return 0;
4962 }
4963
4964 while (!found && fgets(buf, bufsize, f)) {
4965 int is_lineend;
4966 size_t len;
4967 const char **p;
4968
4969 len = strcspn(buf, "\r\n");
4970 is_lineend = buf[len] != '\0';
4971 buf[len] = '\0';
4972
4973 if (is_linestart && is_lineend) {
4974 for (p = lines; !found && *p; p++)
4975 found = os_strcmp(buf, *p) == 0;
4976 }
4977 is_linestart = is_lineend;
4978 }
4979
4980 fclose(f);
4981 bin_clear_free(buf, bufsize);
4982
4983 return found;
4984 }
4985
4986
is_tpm2_key(const char * path)4987 static int is_tpm2_key(const char *path)
4988 {
4989 /* Check both new and old format of TPM2 PEM guard tag */
4990 static const char *tpm2_tags[] = {
4991 "-----BEGIN TSS2 PRIVATE KEY-----",
4992 "-----BEGIN TSS2 KEY BLOB-----",
4993 NULL
4994 };
4995
4996 return match_lines_in_file(path, tpm2_tags);
4997 }
4998
4999
tls_connection_set_params(void * tls_ctx,struct tls_connection * conn,const struct tls_connection_params * params)5000 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
5001 const struct tls_connection_params *params)
5002 {
5003 struct tls_data *data = tls_ctx;
5004 int ret;
5005 unsigned long err;
5006 int can_pkcs11 = 0;
5007 const char *key_id = params->key_id;
5008 const char *cert_id = params->cert_id;
5009 const char *ca_cert_id = params->ca_cert_id;
5010 const char *engine_id = params->engine ? params->engine_id : NULL;
5011 const char *ciphers;
5012
5013 if (conn == NULL)
5014 return -1;
5015
5016 if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
5017 wpa_printf(MSG_INFO,
5018 "OpenSSL: ocsp=3 not supported");
5019 return -1;
5020 }
5021
5022 /*
5023 * If the engine isn't explicitly configured, and any of the
5024 * cert/key fields are actually PKCS#11 URIs, then automatically
5025 * use the PKCS#11 ENGINE.
5026 */
5027 if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
5028 can_pkcs11 = 1;
5029
5030 if (!key_id && params->private_key && can_pkcs11 &&
5031 os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
5032 can_pkcs11 = 2;
5033 key_id = params->private_key;
5034 }
5035
5036 if (!cert_id && params->client_cert && can_pkcs11 &&
5037 os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
5038 can_pkcs11 = 2;
5039 cert_id = params->client_cert;
5040 }
5041
5042 if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
5043 os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
5044 can_pkcs11 = 2;
5045 ca_cert_id = params->ca_cert;
5046 }
5047
5048 /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
5049 if (can_pkcs11 == 2 && !engine_id)
5050 engine_id = "pkcs11";
5051
5052 /* If private_key points to a TPM2-wrapped key, automatically enable
5053 * tpm2 engine and use it to unwrap the key. */
5054 if (params->private_key &&
5055 (!engine_id || os_strcmp(engine_id, "tpm2") == 0) &&
5056 is_tpm2_key(params->private_key)) {
5057 wpa_printf(MSG_DEBUG, "OpenSSL: Found TPM2 wrapped key %s",
5058 params->private_key);
5059 key_id = key_id ? key_id : params->private_key;
5060 engine_id = engine_id ? engine_id : "tpm2";
5061 }
5062
5063 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
5064 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
5065 if (params->flags & TLS_CONN_EAP_FAST) {
5066 wpa_printf(MSG_DEBUG,
5067 "OpenSSL: Use TLSv1_method() for EAP-FAST");
5068 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
5069 tls_show_errors(MSG_INFO, __func__,
5070 "Failed to set TLSv1_method() for EAP-FAST");
5071 return -1;
5072 }
5073 }
5074 #endif
5075 #if OPENSSL_VERSION_NUMBER >= 0x10101000L
5076 #ifdef SSL_OP_NO_TLSv1_3
5077 if (params->flags & TLS_CONN_EAP_FAST) {
5078 /* Need to disable TLS v1.3 at least for now since OpenSSL 1.1.1
5079 * refuses to start the handshake with the modified ciphersuite
5080 * list (no TLS v1.3 ciphersuites included) for EAP-FAST. */
5081 wpa_printf(MSG_DEBUG, "OpenSSL: Disable TLSv1.3 for EAP-FAST");
5082 SSL_set_options(conn->ssl, SSL_OP_NO_TLSv1_3);
5083 }
5084 #endif /* SSL_OP_NO_TLSv1_3 */
5085 #endif
5086 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
5087
5088 while ((err = ERR_get_error())) {
5089 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
5090 __func__, ERR_error_string(err, NULL));
5091 }
5092
5093 if (engine_id) {
5094 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine %s",
5095 engine_id);
5096 ret = tls_engine_init(conn, engine_id, params->pin,
5097 key_id, cert_id, ca_cert_id);
5098 if (ret)
5099 return ret;
5100 }
5101 if (tls_connection_set_subject_match(conn,
5102 params->subject_match,
5103 params->altsubject_match,
5104 params->suffix_match,
5105 params->domain_match,
5106 params->check_cert_subject))
5107 return -1;
5108
5109 if (engine_id && ca_cert_id) {
5110 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
5111 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5112 } else if (tls_connection_ca_cert(data, conn, params->ca_cert,
5113 params->ca_cert_blob,
5114 params->ca_cert_blob_len,
5115 params->ca_path))
5116 return -1;
5117
5118 if (engine_id && cert_id) {
5119 if (tls_connection_engine_client_cert(conn, cert_id))
5120 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5121 } else if (tls_connection_client_cert(conn, params->client_cert,
5122 params->client_cert_blob,
5123 params->client_cert_blob_len))
5124 return -1;
5125
5126 if (engine_id && key_id) {
5127 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
5128 if (tls_connection_engine_private_key(conn))
5129 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
5130 } else if (tls_connection_private_key(data, conn,
5131 params->private_key,
5132 params->private_key_passwd,
5133 params->private_key_blob,
5134 params->private_key_blob_len)) {
5135 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
5136 params->private_key);
5137 return -1;
5138 }
5139
5140 if (tls_connection_dh(conn, params->dh_file)) {
5141 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
5142 params->dh_file);
5143 return -1;
5144 }
5145
5146 ciphers = params->openssl_ciphers;
5147 #ifdef CONFIG_SUITEB
5148 #ifdef OPENSSL_IS_BORINGSSL
5149 if (ciphers && os_strcmp(ciphers, "SUITEB192") == 0) {
5150 /* BoringSSL removed support for SUITEB192, so need to handle
5151 * this with hardcoded ciphersuite and additional checks for
5152 * other parameters. */
5153 ciphers = "ECDHE-ECDSA-AES256-GCM-SHA384";
5154 }
5155 #endif /* OPENSSL_IS_BORINGSSL */
5156 #endif /* CONFIG_SUITEB */
5157 if (ciphers && SSL_set_cipher_list(conn->ssl, ciphers) != 1) {
5158 wpa_printf(MSG_INFO,
5159 "OpenSSL: Failed to set cipher string '%s'",
5160 ciphers);
5161 return -1;
5162 }
5163
5164 if (!params->openssl_ecdh_curves) {
5165 #ifndef OPENSSL_IS_BORINGSSL
5166 #ifndef OPENSSL_NO_EC
5167 #if (OPENSSL_VERSION_NUMBER >= 0x10002000L) && \
5168 (OPENSSL_VERSION_NUMBER < 0x10100000L)
5169 if (SSL_set_ecdh_auto(conn->ssl, 1) != 1) {
5170 wpa_printf(MSG_INFO,
5171 "OpenSSL: Failed to set ECDH curves to auto");
5172 return -1;
5173 }
5174 #endif /* >= 1.0.2 && < 1.1.0 */
5175 #endif /* OPENSSL_NO_EC */
5176 #endif /* OPENSSL_IS_BORINGSSL */
5177 } else if (params->openssl_ecdh_curves[0]) {
5178 #if defined(OPENSSL_IS_BORINGSSL) || (OPENSSL_VERSION_NUMBER < 0x10002000L)
5179 wpa_printf(MSG_INFO,
5180 "OpenSSL: ECDH configuration nnot supported");
5181 return -1;
5182 #else /* OPENSSL_IS_BORINGSSL || < 1.0.2 */
5183 #ifndef OPENSSL_NO_EC
5184 if (SSL_set1_curves_list(conn->ssl,
5185 params->openssl_ecdh_curves) != 1) {
5186 wpa_printf(MSG_INFO,
5187 "OpenSSL: Failed to set ECDH curves '%s'",
5188 params->openssl_ecdh_curves);
5189 return -1;
5190 }
5191 #else /* OPENSSL_NO_EC */
5192 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
5193 return -1;
5194 #endif /* OPENSSL_NO_EC */
5195 #endif /* OPENSSL_IS_BORINGSSL */
5196 }
5197
5198 if (tls_set_conn_flags(conn, params->flags,
5199 params->openssl_ciphers) < 0)
5200 return -1;
5201
5202 #ifdef OPENSSL_IS_BORINGSSL
5203 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5204 SSL_enable_ocsp_stapling(conn->ssl);
5205 }
5206 #else /* OPENSSL_IS_BORINGSSL */
5207 #ifdef HAVE_OCSP
5208 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5209 SSL_CTX *ssl_ctx = data->ssl;
5210 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
5211 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
5212 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
5213 }
5214 #else /* HAVE_OCSP */
5215 if (params->flags & TLS_CONN_REQUIRE_OCSP) {
5216 wpa_printf(MSG_INFO,
5217 "OpenSSL: No OCSP support included - reject configuration");
5218 return -1;
5219 }
5220 if (params->flags & TLS_CONN_REQUEST_OCSP) {
5221 wpa_printf(MSG_DEBUG,
5222 "OpenSSL: No OCSP support included - allow optional OCSP case to continue");
5223 }
5224 #endif /* HAVE_OCSP */
5225 #endif /* OPENSSL_IS_BORINGSSL */
5226
5227 conn->flags = params->flags;
5228
5229 tls_get_errors(data);
5230
5231 return 0;
5232 }
5233
5234
openssl_debug_dump_cipher_list(SSL_CTX * ssl_ctx)5235 static void openssl_debug_dump_cipher_list(SSL_CTX *ssl_ctx)
5236 {
5237 SSL *ssl;
5238 int i;
5239
5240 ssl = SSL_new(ssl_ctx);
5241 if (!ssl)
5242 return;
5243
5244 wpa_printf(MSG_DEBUG,
5245 "OpenSSL: Enabled cipher suites in priority order");
5246 for (i = 0; ; i++) {
5247 const char *cipher;
5248
5249 cipher = SSL_get_cipher_list(ssl, i);
5250 if (!cipher)
5251 break;
5252 wpa_printf(MSG_DEBUG, "Cipher %d: %s", i, cipher);
5253 }
5254
5255 SSL_free(ssl);
5256 }
5257
5258
5259 #if !defined(LIBRESSL_VERSION_NUMBER) && !defined(BORINGSSL_API_VERSION)
5260
openssl_pkey_type_str(const EVP_PKEY * pkey)5261 static const char * openssl_pkey_type_str(const EVP_PKEY *pkey)
5262 {
5263 if (!pkey)
5264 return "NULL";
5265 switch (EVP_PKEY_type(EVP_PKEY_id(pkey))) {
5266 case EVP_PKEY_RSA:
5267 return "RSA";
5268 case EVP_PKEY_DSA:
5269 return "DSA";
5270 case EVP_PKEY_DH:
5271 return "DH";
5272 case EVP_PKEY_EC:
5273 return "EC";
5274 }
5275 return "?";
5276 }
5277
5278
openssl_debug_dump_certificate(int i,X509 * cert)5279 static void openssl_debug_dump_certificate(int i, X509 *cert)
5280 {
5281 char buf[256];
5282 EVP_PKEY *pkey;
5283 ASN1_INTEGER *ser;
5284 char serial_num[128];
5285
5286 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
5287
5288 ser = X509_get_serialNumber(cert);
5289 if (ser)
5290 wpa_snprintf_hex_uppercase(serial_num, sizeof(serial_num),
5291 ASN1_STRING_get0_data(ser),
5292 ASN1_STRING_length(ser));
5293 else
5294 serial_num[0] = '\0';
5295
5296 pkey = X509_get_pubkey(cert);
5297 wpa_printf(MSG_DEBUG, "%d: %s (%s) %s", i, buf,
5298 openssl_pkey_type_str(pkey), serial_num);
5299 EVP_PKEY_free(pkey);
5300 }
5301
5302
openssl_debug_dump_certificates(SSL_CTX * ssl_ctx)5303 static void openssl_debug_dump_certificates(SSL_CTX *ssl_ctx)
5304 {
5305 STACK_OF(X509) *certs;
5306
5307 wpa_printf(MSG_DEBUG, "OpenSSL: Configured certificate chain");
5308 if (SSL_CTX_get0_chain_certs(ssl_ctx, &certs) == 1) {
5309 int i;
5310
5311 for (i = sk_X509_num(certs); i > 0; i--)
5312 openssl_debug_dump_certificate(i, sk_X509_value(certs,
5313 i - 1));
5314 }
5315 openssl_debug_dump_certificate(0, SSL_CTX_get0_certificate(ssl_ctx));
5316 }
5317
5318 #endif
5319
5320
openssl_debug_dump_certificate_chains(SSL_CTX * ssl_ctx)5321 static void openssl_debug_dump_certificate_chains(SSL_CTX *ssl_ctx)
5322 {
5323 #if !defined(LIBRESSL_VERSION_NUMBER) && !defined(BORINGSSL_API_VERSION)
5324 int res;
5325
5326 for (res = SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_FIRST);
5327 res == 1;
5328 res = SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_NEXT))
5329 openssl_debug_dump_certificates(ssl_ctx);
5330
5331 SSL_CTX_set_current_cert(ssl_ctx, SSL_CERT_SET_FIRST);
5332 #endif
5333 }
5334
5335
openssl_debug_dump_ctx(SSL_CTX * ssl_ctx)5336 static void openssl_debug_dump_ctx(SSL_CTX *ssl_ctx)
5337 {
5338 openssl_debug_dump_cipher_list(ssl_ctx);
5339 openssl_debug_dump_certificate_chains(ssl_ctx);
5340 }
5341
5342
tls_global_set_params(void * tls_ctx,const struct tls_connection_params * params)5343 int tls_global_set_params(void *tls_ctx,
5344 const struct tls_connection_params *params)
5345 {
5346 struct tls_data *data = tls_ctx;
5347 SSL_CTX *ssl_ctx = data->ssl;
5348 unsigned long err;
5349
5350 while ((err = ERR_get_error())) {
5351 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
5352 __func__, ERR_error_string(err, NULL));
5353 }
5354
5355 os_free(data->check_cert_subject);
5356 data->check_cert_subject = NULL;
5357 if (params->check_cert_subject) {
5358 data->check_cert_subject =
5359 os_strdup(params->check_cert_subject);
5360 if (!data->check_cert_subject)
5361 return -1;
5362 }
5363
5364 if (tls_global_ca_cert(data, params->ca_cert) ||
5365 tls_global_client_cert(data, params->client_cert) ||
5366 tls_global_private_key(data, params->private_key,
5367 params->private_key_passwd) ||
5368 tls_global_client_cert(data, params->client_cert2) ||
5369 tls_global_private_key(data, params->private_key2,
5370 params->private_key_passwd2) ||
5371 tls_global_dh(data, params->dh_file)) {
5372 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
5373 return -1;
5374 }
5375
5376 if (params->openssl_ciphers &&
5377 SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
5378 wpa_printf(MSG_INFO,
5379 "OpenSSL: Failed to set cipher string '%s'",
5380 params->openssl_ciphers);
5381 return -1;
5382 }
5383
5384 if (!params->openssl_ecdh_curves) {
5385 #ifndef OPENSSL_IS_BORINGSSL
5386 #ifndef OPENSSL_NO_EC
5387 #if (OPENSSL_VERSION_NUMBER >= 0x10002000L) && \
5388 (OPENSSL_VERSION_NUMBER < 0x10100000L)
5389 if (SSL_CTX_set_ecdh_auto(ssl_ctx, 1) != 1) {
5390 wpa_printf(MSG_INFO,
5391 "OpenSSL: Failed to set ECDH curves to auto");
5392 return -1;
5393 }
5394 #endif /* >= 1.0.2 && < 1.1.0 */
5395 #endif /* OPENSSL_NO_EC */
5396 #endif /* OPENSSL_IS_BORINGSSL */
5397 } else if (params->openssl_ecdh_curves[0]) {
5398 #if defined(OPENSSL_IS_BORINGSSL) || (OPENSSL_VERSION_NUMBER < 0x10002000L)
5399 wpa_printf(MSG_INFO,
5400 "OpenSSL: ECDH configuration nnot supported");
5401 return -1;
5402 #else /* OPENSSL_IS_BORINGSSL || < 1.0.2 */
5403 #ifndef OPENSSL_NO_EC
5404 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5405 SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
5406 #endif
5407 if (SSL_CTX_set1_curves_list(ssl_ctx,
5408 params->openssl_ecdh_curves) !=
5409 1) {
5410 wpa_printf(MSG_INFO,
5411 "OpenSSL: Failed to set ECDH curves '%s'",
5412 params->openssl_ecdh_curves);
5413 return -1;
5414 }
5415 #else /* OPENSSL_NO_EC */
5416 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
5417 return -1;
5418 #endif /* OPENSSL_NO_EC */
5419 #endif /* OPENSSL_IS_BORINGSSL */
5420 }
5421
5422 #ifdef SSL_OP_NO_TICKET
5423 if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
5424 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
5425 else
5426 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
5427 #endif /* SSL_OP_NO_TICKET */
5428
5429 #ifdef HAVE_OCSP
5430 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
5431 SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
5432 os_free(tls_global->ocsp_stapling_response);
5433 if (params->ocsp_stapling_response)
5434 tls_global->ocsp_stapling_response =
5435 os_strdup(params->ocsp_stapling_response);
5436 else
5437 tls_global->ocsp_stapling_response = NULL;
5438 #endif /* HAVE_OCSP */
5439
5440 openssl_debug_dump_ctx(ssl_ctx);
5441
5442 return 0;
5443 }
5444
5445
5446 #ifdef EAP_FAST_OR_TEAP
5447 /* Pre-shared secred requires a patch to openssl, so this function is
5448 * commented out unless explicitly needed for EAP-FAST in order to be able to
5449 * build this file with unmodified openssl. */
5450
5451 #if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
tls_sess_sec_cb(SSL * s,void * secret,int * secret_len,STACK_OF (SSL_CIPHER)* peer_ciphers,const SSL_CIPHER ** cipher,void * arg)5452 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5453 STACK_OF(SSL_CIPHER) *peer_ciphers,
5454 const SSL_CIPHER **cipher, void *arg)
5455 #else /* OPENSSL_IS_BORINGSSL */
5456 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5457 STACK_OF(SSL_CIPHER) *peer_ciphers,
5458 SSL_CIPHER **cipher, void *arg)
5459 #endif /* OPENSSL_IS_BORINGSSL */
5460 {
5461 struct tls_connection *conn = arg;
5462 int ret;
5463
5464 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
5465 (defined(LIBRESSL_VERSION_NUMBER) && \
5466 LIBRESSL_VERSION_NUMBER < 0x20700000L)
5467 if (conn == NULL || conn->session_ticket_cb == NULL)
5468 return 0;
5469
5470 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5471 conn->session_ticket,
5472 conn->session_ticket_len,
5473 s->s3->client_random,
5474 s->s3->server_random, secret);
5475 #else
5476 unsigned char client_random[SSL3_RANDOM_SIZE];
5477 unsigned char server_random[SSL3_RANDOM_SIZE];
5478
5479 if (conn == NULL || conn->session_ticket_cb == NULL)
5480 return 0;
5481
5482 SSL_get_client_random(s, client_random, sizeof(client_random));
5483 SSL_get_server_random(s, server_random, sizeof(server_random));
5484
5485 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5486 conn->session_ticket,
5487 conn->session_ticket_len,
5488 client_random,
5489 server_random, secret);
5490 #endif
5491
5492 os_free(conn->session_ticket);
5493 conn->session_ticket = NULL;
5494
5495 if (ret <= 0)
5496 return 0;
5497
5498 *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
5499 return 1;
5500 }
5501
5502
tls_session_ticket_ext_cb(SSL * s,const unsigned char * data,int len,void * arg)5503 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
5504 int len, void *arg)
5505 {
5506 struct tls_connection *conn = arg;
5507
5508 if (conn == NULL || conn->session_ticket_cb == NULL)
5509 return 0;
5510
5511 wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
5512
5513 os_free(conn->session_ticket);
5514 conn->session_ticket = NULL;
5515
5516 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
5517 "extension", data, len);
5518
5519 conn->session_ticket = os_memdup(data, len);
5520 if (conn->session_ticket == NULL)
5521 return 0;
5522
5523 conn->session_ticket_len = len;
5524
5525 return 1;
5526 }
5527 #endif /* EAP_FAST_OR_TEAP */
5528
5529
tls_connection_set_session_ticket_cb(void * tls_ctx,struct tls_connection * conn,tls_session_ticket_cb cb,void * ctx)5530 int tls_connection_set_session_ticket_cb(void *tls_ctx,
5531 struct tls_connection *conn,
5532 tls_session_ticket_cb cb,
5533 void *ctx)
5534 {
5535 #ifdef EAP_FAST_OR_TEAP
5536 conn->session_ticket_cb = cb;
5537 conn->session_ticket_cb_ctx = ctx;
5538
5539 if (cb) {
5540 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
5541 conn) != 1)
5542 return -1;
5543 SSL_set_session_ticket_ext_cb(conn->ssl,
5544 tls_session_ticket_ext_cb, conn);
5545 } else {
5546 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
5547 return -1;
5548 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
5549 }
5550
5551 return 0;
5552 #else /* EAP_FAST_OR_TEAP */
5553 return -1;
5554 #endif /* EAP_FAST_OR_TEAP */
5555 }
5556
5557
tls_get_library_version(char * buf,size_t buf_len)5558 int tls_get_library_version(char *buf, size_t buf_len)
5559 {
5560 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
5561 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5562 OPENSSL_VERSION_TEXT,
5563 OpenSSL_version(OPENSSL_VERSION));
5564 #else
5565 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5566 OPENSSL_VERSION_TEXT,
5567 SSLeay_version(SSLEAY_VERSION));
5568 #endif
5569 }
5570
5571
tls_connection_set_success_data(struct tls_connection * conn,struct wpabuf * data)5572 void tls_connection_set_success_data(struct tls_connection *conn,
5573 struct wpabuf *data)
5574 {
5575 SSL_SESSION *sess;
5576 struct wpabuf *old;
5577
5578 if (tls_ex_idx_session < 0)
5579 goto fail;
5580 sess = SSL_get_session(conn->ssl);
5581 if (!sess)
5582 goto fail;
5583 old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5584 if (old) {
5585 wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
5586 old);
5587 wpabuf_free(old);
5588 }
5589 if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
5590 goto fail;
5591
5592 wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
5593 conn->success_data = 1;
5594 return;
5595
5596 fail:
5597 wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
5598 wpabuf_free(data);
5599 }
5600
5601
tls_connection_set_success_data_resumed(struct tls_connection * conn)5602 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
5603 {
5604 wpa_printf(MSG_DEBUG,
5605 "OpenSSL: Success data accepted for resumed session");
5606 conn->success_data = 1;
5607 }
5608
5609
5610 const struct wpabuf *
tls_connection_get_success_data(struct tls_connection * conn)5611 tls_connection_get_success_data(struct tls_connection *conn)
5612 {
5613 SSL_SESSION *sess;
5614
5615 if (tls_ex_idx_session < 0 ||
5616 !(sess = SSL_get_session(conn->ssl)))
5617 return NULL;
5618 return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5619 }
5620
5621
tls_connection_remove_session(struct tls_connection * conn)5622 void tls_connection_remove_session(struct tls_connection *conn)
5623 {
5624 SSL_SESSION *sess;
5625
5626 sess = SSL_get_session(conn->ssl);
5627 if (!sess)
5628 return;
5629
5630 if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
5631 wpa_printf(MSG_DEBUG,
5632 "OpenSSL: Session was not cached");
5633 else
5634 wpa_printf(MSG_DEBUG,
5635 "OpenSSL: Removed cached session to disable session resumption");
5636 }
5637
5638
tls_get_tls_unique(struct tls_connection * conn,u8 * buf,size_t max_len)5639 int tls_get_tls_unique(struct tls_connection *conn, u8 *buf, size_t max_len)
5640 {
5641 size_t len;
5642 int reused;
5643
5644 reused = SSL_session_reused(conn->ssl);
5645 if ((conn->server && !reused) || (!conn->server && reused))
5646 len = SSL_get_peer_finished(conn->ssl, buf, max_len);
5647 else
5648 len = SSL_get_finished(conn->ssl, buf, max_len);
5649
5650 if (len == 0 || len > max_len)
5651 return -1;
5652
5653 return len;
5654 }
5655
5656
tls_connection_get_cipher_suite(struct tls_connection * conn)5657 u16 tls_connection_get_cipher_suite(struct tls_connection *conn)
5658 {
5659 const SSL_CIPHER *cipher;
5660
5661 cipher = SSL_get_current_cipher(conn->ssl);
5662 if (!cipher)
5663 return 0;
5664 #if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
5665 return SSL_CIPHER_get_protocol_id(cipher);
5666 #else
5667 return SSL_CIPHER_get_id(cipher) & 0xFFFF;
5668 #endif
5669 }
5670