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1 /*
2  * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4  *
5  * Licensed under the Apache License 2.0 (the "License").  You may not use
6  * this file except in compliance with the License.  You can obtain a copy
7  * in the file LICENSE in the source distribution or at
8  * https://www.openssl.org/source/license.html
9  */
10 
11 #include <stdio.h>
12 #include <sys/types.h>
13 
14 #include "internal/nelem.h"
15 #include "internal/o_dir.h"
16 #include <openssl/bio.h>
17 #include <openssl/pem.h>
18 #include <openssl/store.h>
19 #include <openssl/x509v3.h>
20 #include <openssl/dh.h>
21 #include <openssl/bn.h>
22 #include <openssl/crypto.h>
23 #include "internal/refcount.h"
24 #include "ssl_local.h"
25 #include "ssl_cert_table.h"
26 #include "internal/thread_once.h"
27 
28 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
29                                          int op, int bits, int nid, void *other,
30                                          void *ex);
31 
32 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
33 static volatile int ssl_x509_store_ctx_idx = -1;
34 
DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)35 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
36 {
37     ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
38                                                              "SSL for verify callback",
39                                                              NULL, NULL, NULL);
40     return ssl_x509_store_ctx_idx >= 0;
41 }
42 
SSL_get_ex_data_X509_STORE_CTX_idx(void)43 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
44 {
45 
46     if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
47         return -1;
48     return ssl_x509_store_ctx_idx;
49 }
50 
ssl_cert_new(void)51 CERT *ssl_cert_new(void)
52 {
53     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
54 
55     if (ret == NULL) {
56         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
57         return NULL;
58     }
59 
60     ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
61     ret->references = 1;
62     ret->sec_cb = ssl_security_default_callback;
63     ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
64     ret->sec_ex = NULL;
65     ret->lock = CRYPTO_THREAD_lock_new();
66     if (ret->lock == NULL) {
67         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
68         OPENSSL_free(ret);
69         return NULL;
70     }
71 
72     return ret;
73 }
74 
ssl_cert_dup(CERT * cert)75 CERT *ssl_cert_dup(CERT *cert)
76 {
77     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
78     int i;
79 
80     if (ret == NULL) {
81         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
82         return NULL;
83     }
84 
85     ret->references = 1;
86     ret->key = &ret->pkeys[cert->key - cert->pkeys];
87     ret->lock = CRYPTO_THREAD_lock_new();
88     if (ret->lock == NULL) {
89         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
90         OPENSSL_free(ret);
91         return NULL;
92     }
93 
94     if (cert->dh_tmp != NULL) {
95         ret->dh_tmp = cert->dh_tmp;
96         EVP_PKEY_up_ref(ret->dh_tmp);
97     }
98 
99     ret->dh_tmp_cb = cert->dh_tmp_cb;
100     ret->dh_tmp_auto = cert->dh_tmp_auto;
101 
102     for (i = 0; i < SSL_PKEY_NUM; i++) {
103         CERT_PKEY *cpk = cert->pkeys + i;
104         CERT_PKEY *rpk = ret->pkeys + i;
105         if (cpk->x509 != NULL) {
106             rpk->x509 = cpk->x509;
107             X509_up_ref(rpk->x509);
108         }
109 
110         if (cpk->privatekey != NULL) {
111             rpk->privatekey = cpk->privatekey;
112             EVP_PKEY_up_ref(cpk->privatekey);
113         }
114 
115         if (cpk->chain) {
116             rpk->chain = X509_chain_up_ref(cpk->chain);
117             if (!rpk->chain) {
118                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
119                 goto err;
120             }
121         }
122         if (cert->pkeys[i].serverinfo != NULL) {
123             /* Just copy everything. */
124             ret->pkeys[i].serverinfo =
125                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
126             if (ret->pkeys[i].serverinfo == NULL) {
127                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
128                 goto err;
129             }
130             ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
131             memcpy(ret->pkeys[i].serverinfo,
132                    cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
133         }
134     }
135 
136     /* Configured sigalgs copied across */
137     if (cert->conf_sigalgs) {
138         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
139                                            * sizeof(*cert->conf_sigalgs));
140         if (ret->conf_sigalgs == NULL)
141             goto err;
142         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
143                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
144         ret->conf_sigalgslen = cert->conf_sigalgslen;
145     } else
146         ret->conf_sigalgs = NULL;
147 
148     if (cert->client_sigalgs) {
149         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
150                                              * sizeof(*cert->client_sigalgs));
151         if (ret->client_sigalgs == NULL)
152             goto err;
153         memcpy(ret->client_sigalgs, cert->client_sigalgs,
154                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
155         ret->client_sigalgslen = cert->client_sigalgslen;
156     } else
157         ret->client_sigalgs = NULL;
158     /* Copy any custom client certificate types */
159     if (cert->ctype) {
160         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
161         if (ret->ctype == NULL)
162             goto err;
163         ret->ctype_len = cert->ctype_len;
164     }
165 
166     ret->cert_flags = cert->cert_flags;
167 
168     ret->cert_cb = cert->cert_cb;
169     ret->cert_cb_arg = cert->cert_cb_arg;
170 
171     if (cert->verify_store) {
172         X509_STORE_up_ref(cert->verify_store);
173         ret->verify_store = cert->verify_store;
174     }
175 
176     if (cert->chain_store) {
177         X509_STORE_up_ref(cert->chain_store);
178         ret->chain_store = cert->chain_store;
179     }
180 
181     ret->sec_cb = cert->sec_cb;
182     ret->sec_level = cert->sec_level;
183     ret->sec_ex = cert->sec_ex;
184 
185     if (!custom_exts_copy(&ret->custext, &cert->custext))
186         goto err;
187 #ifndef OPENSSL_NO_PSK
188     if (cert->psk_identity_hint) {
189         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
190         if (ret->psk_identity_hint == NULL)
191             goto err;
192     }
193 #endif
194     return ret;
195 
196  err:
197     ssl_cert_free(ret);
198 
199     return NULL;
200 }
201 
202 /* Free up and clear all certificates and chains */
203 
ssl_cert_clear_certs(CERT * c)204 void ssl_cert_clear_certs(CERT *c)
205 {
206     int i;
207     if (c == NULL)
208         return;
209     for (i = 0; i < SSL_PKEY_NUM; i++) {
210         CERT_PKEY *cpk = c->pkeys + i;
211         X509_free(cpk->x509);
212         cpk->x509 = NULL;
213         EVP_PKEY_free(cpk->privatekey);
214         cpk->privatekey = NULL;
215         sk_X509_pop_free(cpk->chain, X509_free);
216         cpk->chain = NULL;
217         OPENSSL_free(cpk->serverinfo);
218         cpk->serverinfo = NULL;
219         cpk->serverinfo_length = 0;
220     }
221 }
222 
ssl_cert_free(CERT * c)223 void ssl_cert_free(CERT *c)
224 {
225     int i;
226 
227     if (c == NULL)
228         return;
229     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
230     REF_PRINT_COUNT("CERT", c);
231     if (i > 0)
232         return;
233     REF_ASSERT_ISNT(i < 0);
234 
235     EVP_PKEY_free(c->dh_tmp);
236 
237     ssl_cert_clear_certs(c);
238     OPENSSL_free(c->conf_sigalgs);
239     OPENSSL_free(c->client_sigalgs);
240     OPENSSL_free(c->ctype);
241     X509_STORE_free(c->verify_store);
242     X509_STORE_free(c->chain_store);
243     custom_exts_free(&c->custext);
244 #ifndef OPENSSL_NO_PSK
245     OPENSSL_free(c->psk_identity_hint);
246 #endif
247     CRYPTO_THREAD_lock_free(c->lock);
248     OPENSSL_free(c);
249 }
250 
ssl_cert_set0_chain(SSL * s,SSL_CTX * ctx,STACK_OF (X509)* chain)251 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
252 {
253     int i, r;
254     CERT_PKEY *cpk = s != NULL ? s->cert->key : ctx->cert->key;
255 
256     if (!cpk)
257         return 0;
258     for (i = 0; i < sk_X509_num(chain); i++) {
259         X509 *x = sk_X509_value(chain, i);
260 
261         r = ssl_security_cert(s, ctx, x, 0, 0);
262         if (r != 1) {
263             ERR_raise(ERR_LIB_SSL, r);
264             return 0;
265         }
266     }
267     sk_X509_pop_free(cpk->chain, X509_free);
268     cpk->chain = chain;
269     return 1;
270 }
271 
ssl_cert_set1_chain(SSL * s,SSL_CTX * ctx,STACK_OF (X509)* chain)272 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
273 {
274     STACK_OF(X509) *dchain;
275     if (!chain)
276         return ssl_cert_set0_chain(s, ctx, NULL);
277     dchain = X509_chain_up_ref(chain);
278     if (!dchain)
279         return 0;
280     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
281         sk_X509_pop_free(dchain, X509_free);
282         return 0;
283     }
284     return 1;
285 }
286 
ssl_cert_add0_chain_cert(SSL * s,SSL_CTX * ctx,X509 * x)287 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
288 {
289     int r;
290     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
291     if (!cpk)
292         return 0;
293     r = ssl_security_cert(s, ctx, x, 0, 0);
294     if (r != 1) {
295         ERR_raise(ERR_LIB_SSL, r);
296         return 0;
297     }
298     if (!cpk->chain)
299         cpk->chain = sk_X509_new_null();
300     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
301         return 0;
302     return 1;
303 }
304 
ssl_cert_add1_chain_cert(SSL * s,SSL_CTX * ctx,X509 * x)305 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
306 {
307     if (!ssl_cert_add0_chain_cert(s, ctx, x))
308         return 0;
309     X509_up_ref(x);
310     return 1;
311 }
312 
ssl_cert_select_current(CERT * c,X509 * x)313 int ssl_cert_select_current(CERT *c, X509 *x)
314 {
315     int i;
316     if (x == NULL)
317         return 0;
318     for (i = 0; i < SSL_PKEY_NUM; i++) {
319         CERT_PKEY *cpk = c->pkeys + i;
320         if (cpk->x509 == x && cpk->privatekey) {
321             c->key = cpk;
322             return 1;
323         }
324     }
325 
326     for (i = 0; i < SSL_PKEY_NUM; i++) {
327         CERT_PKEY *cpk = c->pkeys + i;
328         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
329             c->key = cpk;
330             return 1;
331         }
332     }
333     return 0;
334 }
335 
ssl_cert_set_current(CERT * c,long op)336 int ssl_cert_set_current(CERT *c, long op)
337 {
338     int i, idx;
339     if (!c)
340         return 0;
341     if (op == SSL_CERT_SET_FIRST)
342         idx = 0;
343     else if (op == SSL_CERT_SET_NEXT) {
344         idx = (int)(c->key - c->pkeys + 1);
345         if (idx >= SSL_PKEY_NUM)
346             return 0;
347     } else
348         return 0;
349     for (i = idx; i < SSL_PKEY_NUM; i++) {
350         CERT_PKEY *cpk = c->pkeys + i;
351         if (cpk->x509 && cpk->privatekey) {
352             c->key = cpk;
353             return 1;
354         }
355     }
356     return 0;
357 }
358 
ssl_cert_set_cert_cb(CERT * c,int (* cb)(SSL * ssl,void * arg),void * arg)359 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
360 {
361     c->cert_cb = cb;
362     c->cert_cb_arg = arg;
363 }
364 
365 /*
366  * Verify a certificate chain
367  * Return codes:
368  *  1: Verify success
369  *  0: Verify failure or error
370  * -1: Retry required
371  */
ssl_verify_cert_chain(SSL * s,STACK_OF (X509)* sk)372 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
373 {
374     X509 *x;
375     int i = 0;
376     X509_STORE *verify_store;
377     X509_STORE_CTX *ctx = NULL;
378     X509_VERIFY_PARAM *param;
379 
380     if ((sk == NULL) || (sk_X509_num(sk) == 0))
381         return 0;
382 
383     if (s->cert->verify_store)
384         verify_store = s->cert->verify_store;
385     else
386         verify_store = s->ctx->cert_store;
387 
388     ctx = X509_STORE_CTX_new_ex(s->ctx->libctx, s->ctx->propq);
389     if (ctx == NULL) {
390         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
391         return 0;
392     }
393 
394     x = sk_X509_value(sk, 0);
395     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
396         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
397         goto end;
398     }
399     param = X509_STORE_CTX_get0_param(ctx);
400     /*
401      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
402      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
403      * and PKI authentication.
404      */
405     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
406 
407     /* Set suite B flags if needed */
408     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
409     if (!X509_STORE_CTX_set_ex_data
410         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
411         goto end;
412     }
413 
414     /* Verify via DANE if enabled */
415     if (DANETLS_ENABLED(&s->dane))
416         X509_STORE_CTX_set0_dane(ctx, &s->dane);
417 
418     /*
419      * We need to inherit the verify parameters. These can be determined by
420      * the context: if its a server it will verify SSL client certificates or
421      * vice versa.
422      */
423 
424     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
425     /*
426      * Anything non-default in "s->param" should overwrite anything in the ctx.
427      */
428     X509_VERIFY_PARAM_set1(param, s->param);
429 
430     if (s->verify_callback)
431         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
432 
433     if (s->ctx->app_verify_callback != NULL) {
434         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
435     } else {
436         i = X509_verify_cert(ctx);
437         /* We treat an error in the same way as a failure to verify */
438         if (i < 0)
439             i = 0;
440     }
441 
442     s->verify_result = X509_STORE_CTX_get_error(ctx);
443     sk_X509_pop_free(s->verified_chain, X509_free);
444     s->verified_chain = NULL;
445     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
446         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
447         if (s->verified_chain == NULL) {
448             ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
449             i = 0;
450         }
451     }
452 
453     /* Move peername from the store context params to the SSL handle's */
454     X509_VERIFY_PARAM_move_peername(s->param, param);
455 
456  end:
457     X509_STORE_CTX_free(ctx);
458     return i;
459 }
460 
set0_CA_list(STACK_OF (X509_NAME)** ca_list,STACK_OF (X509_NAME)* name_list)461 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
462                         STACK_OF(X509_NAME) *name_list)
463 {
464     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
465     *ca_list = name_list;
466 }
467 
STACK_OF(X509_NAME)468 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
469 {
470     int i;
471     const int num = sk_X509_NAME_num(sk);
472     STACK_OF(X509_NAME) *ret;
473     X509_NAME *name;
474 
475     ret = sk_X509_NAME_new_reserve(NULL, num);
476     if (ret == NULL) {
477         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
478         return NULL;
479     }
480     for (i = 0; i < num; i++) {
481         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
482         if (name == NULL) {
483             ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
484             sk_X509_NAME_pop_free(ret, X509_NAME_free);
485             return NULL;
486         }
487         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
488     }
489     return ret;
490 }
491 
SSL_set0_CA_list(SSL * s,STACK_OF (X509_NAME)* name_list)492 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
493 {
494     set0_CA_list(&s->ca_names, name_list);
495 }
496 
SSL_CTX_set0_CA_list(SSL_CTX * ctx,STACK_OF (X509_NAME)* name_list)497 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
498 {
499     set0_CA_list(&ctx->ca_names, name_list);
500 }
501 
STACK_OF(X509_NAME)502 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
503 {
504     return ctx->ca_names;
505 }
506 
STACK_OF(X509_NAME)507 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
508 {
509     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
510 }
511 
SSL_CTX_set_client_CA_list(SSL_CTX * ctx,STACK_OF (X509_NAME)* name_list)512 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
513 {
514     set0_CA_list(&ctx->client_ca_names, name_list);
515 }
516 
STACK_OF(X509_NAME)517 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
518 {
519     return ctx->client_ca_names;
520 }
521 
SSL_set_client_CA_list(SSL * s,STACK_OF (X509_NAME)* name_list)522 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
523 {
524     set0_CA_list(&s->client_ca_names, name_list);
525 }
526 
STACK_OF(X509_NAME)527 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
528 {
529     return s->s3.tmp.peer_ca_names;
530 }
531 
STACK_OF(X509_NAME)532 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
533 {
534     if (!s->server)
535         return s->s3.tmp.peer_ca_names;
536     return s->client_ca_names != NULL ?  s->client_ca_names
537                                       : s->ctx->client_ca_names;
538 }
539 
add_ca_name(STACK_OF (X509_NAME)** sk,const X509 * x)540 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
541 {
542     X509_NAME *name;
543 
544     if (x == NULL)
545         return 0;
546     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
547         return 0;
548 
549     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
550         return 0;
551 
552     if (!sk_X509_NAME_push(*sk, name)) {
553         X509_NAME_free(name);
554         return 0;
555     }
556     return 1;
557 }
558 
SSL_add1_to_CA_list(SSL * ssl,const X509 * x)559 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
560 {
561     return add_ca_name(&ssl->ca_names, x);
562 }
563 
SSL_CTX_add1_to_CA_list(SSL_CTX * ctx,const X509 * x)564 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
565 {
566     return add_ca_name(&ctx->ca_names, x);
567 }
568 
569 /*
570  * The following two are older names are to be replaced with
571  * SSL(_CTX)_add1_to_CA_list
572  */
SSL_add_client_CA(SSL * ssl,X509 * x)573 int SSL_add_client_CA(SSL *ssl, X509 *x)
574 {
575     return add_ca_name(&ssl->client_ca_names, x);
576 }
577 
SSL_CTX_add_client_CA(SSL_CTX * ctx,X509 * x)578 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
579 {
580     return add_ca_name(&ctx->client_ca_names, x);
581 }
582 
xname_cmp(const X509_NAME * a,const X509_NAME * b)583 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
584 {
585     unsigned char *abuf = NULL, *bbuf = NULL;
586     int alen, blen, ret;
587 
588     /* X509_NAME_cmp() itself casts away constness in this way, so
589      * assume it's safe:
590      */
591     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
592     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
593 
594     if (alen < 0 || blen < 0)
595         ret = -2;
596     else if (alen != blen)
597         ret = alen - blen;
598     else /* alen == blen */
599         ret = memcmp(abuf, bbuf, alen);
600 
601     OPENSSL_free(abuf);
602     OPENSSL_free(bbuf);
603 
604     return ret;
605 }
606 
xname_sk_cmp(const X509_NAME * const * a,const X509_NAME * const * b)607 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
608 {
609     return xname_cmp(*a, *b);
610 }
611 
xname_hash(const X509_NAME * a)612 static unsigned long xname_hash(const X509_NAME *a)
613 {
614     /* This returns 0 also if SHA1 is not available */
615     return X509_NAME_hash_ex((X509_NAME *)a, NULL, NULL, NULL);
616 }
617 
STACK_OF(X509_NAME)618 STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
619                                                 OSSL_LIB_CTX *libctx,
620                                                 const char *propq)
621 {
622     BIO *in = BIO_new(BIO_s_file());
623     X509 *x = NULL;
624     X509_NAME *xn = NULL;
625     STACK_OF(X509_NAME) *ret = NULL;
626     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
627     OSSL_LIB_CTX *prev_libctx = NULL;
628 
629     if ((name_hash == NULL) || (in == NULL)) {
630         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
631         goto err;
632     }
633 
634     x = X509_new_ex(libctx, propq);
635     if (x == NULL) {
636         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
637         goto err;
638     }
639     if (BIO_read_filename(in, file) <= 0)
640         goto err;
641 
642     /* Internally lh_X509_NAME_retrieve() needs the libctx to retrieve SHA1 */
643     prev_libctx = OSSL_LIB_CTX_set0_default(libctx);
644     for (;;) {
645         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
646             break;
647         if (ret == NULL) {
648             ret = sk_X509_NAME_new_null();
649             if (ret == NULL) {
650                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
651                 goto err;
652             }
653         }
654         if ((xn = X509_get_subject_name(x)) == NULL)
655             goto err;
656         /* check for duplicates */
657         xn = X509_NAME_dup(xn);
658         if (xn == NULL)
659             goto err;
660         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
661             /* Duplicate. */
662             X509_NAME_free(xn);
663             xn = NULL;
664         } else {
665             lh_X509_NAME_insert(name_hash, xn);
666             if (!sk_X509_NAME_push(ret, xn))
667                 goto err;
668         }
669     }
670     goto done;
671 
672  err:
673     X509_NAME_free(xn);
674     sk_X509_NAME_pop_free(ret, X509_NAME_free);
675     ret = NULL;
676  done:
677     /* restore the old libctx */
678     OSSL_LIB_CTX_set0_default(prev_libctx);
679     BIO_free(in);
680     X509_free(x);
681     lh_X509_NAME_free(name_hash);
682     if (ret != NULL)
683         ERR_clear_error();
684     return ret;
685 }
686 
STACK_OF(X509_NAME)687 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
688 {
689     return SSL_load_client_CA_file_ex(file, NULL, NULL);
690 }
691 
SSL_add_file_cert_subjects_to_stack(STACK_OF (X509_NAME)* stack,const char * file)692 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
693                                         const char *file)
694 {
695     BIO *in;
696     X509 *x = NULL;
697     X509_NAME *xn = NULL;
698     int ret = 1;
699     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
700 
701     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
702 
703     in = BIO_new(BIO_s_file());
704 
705     if (in == NULL) {
706         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
707         goto err;
708     }
709 
710     if (BIO_read_filename(in, file) <= 0)
711         goto err;
712 
713     for (;;) {
714         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
715             break;
716         if ((xn = X509_get_subject_name(x)) == NULL)
717             goto err;
718         xn = X509_NAME_dup(xn);
719         if (xn == NULL)
720             goto err;
721         if (sk_X509_NAME_find(stack, xn) >= 0) {
722             /* Duplicate. */
723             X509_NAME_free(xn);
724         } else if (!sk_X509_NAME_push(stack, xn)) {
725             X509_NAME_free(xn);
726             goto err;
727         }
728     }
729 
730     ERR_clear_error();
731     goto done;
732 
733  err:
734     ret = 0;
735  done:
736     BIO_free(in);
737     X509_free(x);
738     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
739     return ret;
740 }
741 
SSL_add_dir_cert_subjects_to_stack(STACK_OF (X509_NAME)* stack,const char * dir)742 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
743                                        const char *dir)
744 {
745     OPENSSL_DIR_CTX *d = NULL;
746     const char *filename;
747     int ret = 0;
748 
749     /* Note that a side effect is that the CAs will be sorted by name */
750 
751     while ((filename = OPENSSL_DIR_read(&d, dir))) {
752         char buf[1024];
753         int r;
754 
755         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
756             ERR_raise(ERR_LIB_SSL, SSL_R_PATH_TOO_LONG);
757             goto err;
758         }
759 #ifdef OPENSSL_SYS_VMS
760         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
761 #else
762         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
763 #endif
764         if (r <= 0 || r >= (int)sizeof(buf))
765             goto err;
766         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
767             goto err;
768     }
769 
770     if (errno) {
771         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
772                        "calling OPENSSL_dir_read(%s)", dir);
773         ERR_raise(ERR_LIB_SSL, ERR_R_SYS_LIB);
774         goto err;
775     }
776 
777     ret = 1;
778 
779  err:
780     if (d)
781         OPENSSL_DIR_end(&d);
782 
783     return ret;
784 }
785 
add_uris_recursive(STACK_OF (X509_NAME)* stack,const char * uri,int depth)786 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
787                               const char *uri, int depth)
788 {
789     int ok = 1;
790     OSSL_STORE_CTX *ctx = NULL;
791     X509 *x = NULL;
792     X509_NAME *xn = NULL;
793 
794     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
795         goto err;
796 
797     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
798         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
799         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
800 
801         if (info == NULL)
802             continue;
803 
804         if (infotype == OSSL_STORE_INFO_NAME) {
805             /*
806              * This is an entry in the "directory" represented by the current
807              * uri.  if |depth| allows, dive into it.
808              */
809             if (depth > 0)
810                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
811                                         depth - 1);
812         } else if (infotype == OSSL_STORE_INFO_CERT) {
813             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
814                 || (xn = X509_get_subject_name(x)) == NULL
815                 || (xn = X509_NAME_dup(xn)) == NULL)
816                 goto err;
817             if (sk_X509_NAME_find(stack, xn) >= 0) {
818                 /* Duplicate. */
819                 X509_NAME_free(xn);
820             } else if (!sk_X509_NAME_push(stack, xn)) {
821                 X509_NAME_free(xn);
822                 goto err;
823             }
824         }
825 
826         OSSL_STORE_INFO_free(info);
827     }
828 
829     ERR_clear_error();
830     goto done;
831 
832  err:
833     ok = 0;
834  done:
835     OSSL_STORE_close(ctx);
836 
837     return ok;
838 }
839 
SSL_add_store_cert_subjects_to_stack(STACK_OF (X509_NAME)* stack,const char * store)840 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
841                                          const char *store)
842 {
843     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
844         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
845     int ret = add_uris_recursive(stack, store, 1);
846 
847     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
848     return ret;
849 }
850 
851 /* Build a certificate chain for current certificate */
ssl_build_cert_chain(SSL * s,SSL_CTX * ctx,int flags)852 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
853 {
854     CERT *c = s ? s->cert : ctx->cert;
855     CERT_PKEY *cpk = c->key;
856     X509_STORE *chain_store = NULL;
857     X509_STORE_CTX *xs_ctx = NULL;
858     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
859     X509 *x;
860     SSL_CTX *real_ctx = (s == NULL) ? ctx : s->ctx;
861     int i, rv = 0;
862 
863     if (!cpk->x509) {
864         ERR_raise(ERR_LIB_SSL, SSL_R_NO_CERTIFICATE_SET);
865         goto err;
866     }
867     /* Rearranging and check the chain: add everything to a store */
868     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
869         chain_store = X509_STORE_new();
870         if (chain_store == NULL)
871             goto err;
872         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
873             x = sk_X509_value(cpk->chain, i);
874             if (!X509_STORE_add_cert(chain_store, x))
875                 goto err;
876         }
877         /* Add EE cert too: it might be self signed */
878         if (!X509_STORE_add_cert(chain_store, cpk->x509))
879             goto err;
880     } else {
881         if (c->chain_store)
882             chain_store = c->chain_store;
883         else if (s)
884             chain_store = s->ctx->cert_store;
885         else
886             chain_store = ctx->cert_store;
887 
888         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
889             untrusted = cpk->chain;
890     }
891 
892     xs_ctx = X509_STORE_CTX_new_ex(real_ctx->libctx, real_ctx->propq);
893     if (xs_ctx == NULL) {
894         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
895         goto err;
896     }
897     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
898         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
899         goto err;
900     }
901     /* Set suite B flags if needed */
902     X509_STORE_CTX_set_flags(xs_ctx,
903                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
904 
905     i = X509_verify_cert(xs_ctx);
906     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
907         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
908             ERR_clear_error();
909         i = 1;
910         rv = 2;
911     }
912     if (i > 0)
913         chain = X509_STORE_CTX_get1_chain(xs_ctx);
914     if (i <= 0) {
915         i = X509_STORE_CTX_get_error(xs_ctx);
916         ERR_raise_data(ERR_LIB_SSL, SSL_R_CERTIFICATE_VERIFY_FAILED,
917                        "Verify error:%s", X509_verify_cert_error_string(i));
918 
919         goto err;
920     }
921     /* Remove EE certificate from chain */
922     x = sk_X509_shift(chain);
923     X509_free(x);
924     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
925         if (sk_X509_num(chain) > 0) {
926             /* See if last cert is self signed */
927             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
928             if (X509_get_extension_flags(x) & EXFLAG_SS) {
929                 x = sk_X509_pop(chain);
930                 X509_free(x);
931             }
932         }
933     }
934     /*
935      * Check security level of all CA certificates: EE will have been checked
936      * already.
937      */
938     for (i = 0; i < sk_X509_num(chain); i++) {
939         x = sk_X509_value(chain, i);
940         rv = ssl_security_cert(s, ctx, x, 0, 0);
941         if (rv != 1) {
942             ERR_raise(ERR_LIB_SSL, rv);
943             sk_X509_pop_free(chain, X509_free);
944             rv = 0;
945             goto err;
946         }
947     }
948     sk_X509_pop_free(cpk->chain, X509_free);
949     cpk->chain = chain;
950     if (rv == 0)
951         rv = 1;
952  err:
953     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
954         X509_STORE_free(chain_store);
955     X509_STORE_CTX_free(xs_ctx);
956 
957     return rv;
958 }
959 
ssl_cert_set_cert_store(CERT * c,X509_STORE * store,int chain,int ref)960 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
961 {
962     X509_STORE **pstore;
963     if (chain)
964         pstore = &c->chain_store;
965     else
966         pstore = &c->verify_store;
967     X509_STORE_free(*pstore);
968     *pstore = store;
969     if (ref && store)
970         X509_STORE_up_ref(store);
971     return 1;
972 }
973 
ssl_cert_get_cert_store(CERT * c,X509_STORE ** pstore,int chain)974 int ssl_cert_get_cert_store(CERT *c, X509_STORE **pstore, int chain)
975 {
976     *pstore = (chain ? c->chain_store : c->verify_store);
977     return 1;
978 }
979 
ssl_get_security_level_bits(const SSL * s,const SSL_CTX * ctx,int * levelp)980 int ssl_get_security_level_bits(const SSL *s, const SSL_CTX *ctx, int *levelp)
981 {
982     int level;
983     /*
984      * note that there's a corresponding minbits_table
985      * in crypto/x509/x509_vfy.c that's used for checking the security level
986      * of RSA and DSA keys
987      */
988     static const int minbits_table[5 + 1] = { 0, 80, 112, 128, 192, 256 };
989 
990     if (ctx != NULL)
991         level = SSL_CTX_get_security_level(ctx);
992     else
993         level = SSL_get_security_level(s);
994 
995     if (level > 5)
996         level = 5;
997     else if (level < 0)
998         level = 0;
999 
1000     if (levelp != NULL)
1001         *levelp = level;
1002 
1003     return minbits_table[level];
1004 }
1005 
ssl_security_default_callback(const SSL * s,const SSL_CTX * ctx,int op,int bits,int nid,void * other,void * ex)1006 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
1007                                          int op, int bits, int nid, void *other,
1008                                          void *ex)
1009 {
1010     int level, minbits, pfs_mask;
1011 
1012     minbits = ssl_get_security_level_bits(s, ctx, &level);
1013 
1014     if (level == 0) {
1015         /*
1016          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
1017          * anything goes.
1018          */
1019         if (op == SSL_SECOP_TMP_DH && bits < 80)
1020             return 0;
1021         return 1;
1022     }
1023     switch (op) {
1024     case SSL_SECOP_CIPHER_SUPPORTED:
1025     case SSL_SECOP_CIPHER_SHARED:
1026     case SSL_SECOP_CIPHER_CHECK:
1027         {
1028             const SSL_CIPHER *c = other;
1029             /* No ciphers below security level */
1030             if (bits < minbits)
1031                 return 0;
1032             /* No unauthenticated ciphersuites */
1033             if (c->algorithm_auth & SSL_aNULL)
1034                 return 0;
1035             /* No MD5 mac ciphersuites */
1036             if (c->algorithm_mac & SSL_MD5)
1037                 return 0;
1038             /* SHA1 HMAC is 160 bits of security */
1039             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
1040                 return 0;
1041             /* Level 2: no RC4 */
1042             if (level >= 2 && c->algorithm_enc == SSL_RC4)
1043                 return 0;
1044             /* Level 3: forward secure ciphersuites only */
1045             pfs_mask = SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK;
1046             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
1047                                !(c->algorithm_mkey & pfs_mask))
1048                 return 0;
1049             break;
1050         }
1051     case SSL_SECOP_VERSION:
1052         if (!SSL_IS_DTLS(s)) {
1053             /* SSLv3 not allowed at level 2 */
1054             if (nid <= SSL3_VERSION && level >= 2)
1055                 return 0;
1056             /* TLS v1.1 and above only for level 3 */
1057             if (nid <= TLS1_VERSION && level >= 3)
1058                 return 0;
1059             /* TLS v1.2 only for level 4 and above */
1060             if (nid <= TLS1_1_VERSION && level >= 4)
1061                 return 0;
1062         } else {
1063             /* DTLS v1.2 only for level 4 and above */
1064             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
1065                 return 0;
1066         }
1067         break;
1068 
1069     case SSL_SECOP_COMPRESSION:
1070         if (level >= 2)
1071             return 0;
1072         break;
1073     case SSL_SECOP_TICKET:
1074         if (level >= 3)
1075             return 0;
1076         break;
1077     default:
1078         if (bits < minbits)
1079             return 0;
1080     }
1081     return 1;
1082 }
1083 
ssl_security(const SSL * s,int op,int bits,int nid,void * other)1084 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
1085 {
1086     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1087 }
1088 
ssl_ctx_security(const SSL_CTX * ctx,int op,int bits,int nid,void * other)1089 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1090 {
1091     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1092                              ctx->cert->sec_ex);
1093 }
1094 
ssl_cert_lookup_by_nid(int nid,size_t * pidx)1095 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1096 {
1097     size_t i;
1098 
1099     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1100         if (ssl_cert_info[i].nid == nid) {
1101             *pidx = i;
1102             return 1;
1103         }
1104     }
1105 
1106     return 0;
1107 }
1108 
ssl_cert_lookup_by_pkey(const EVP_PKEY * pk,size_t * pidx)1109 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1110 {
1111     size_t i;
1112 
1113     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1114         const SSL_CERT_LOOKUP *tmp_lu = &ssl_cert_info[i];
1115 
1116         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1117             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1118             if (pidx != NULL)
1119                 *pidx = i;
1120             return tmp_lu;
1121         }
1122     }
1123 
1124     return NULL;
1125 }
1126 
ssl_cert_lookup_by_idx(size_t idx)1127 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1128 {
1129     if (idx >= OSSL_NELEM(ssl_cert_info))
1130         return NULL;
1131     return &ssl_cert_info[idx];
1132 }
1133