1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <assert.h>
58 #include <ctype.h>
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/base64.h>
63 #include <openssl/buf.h>
64 #include <openssl/des.h>
65 #include <openssl/err.h>
66 #include <openssl/evp.h>
67 #include <openssl/mem.h>
68 #include <openssl/obj.h>
69 #include <openssl/pem.h>
70 #include <openssl/rand.h>
71 #include <openssl/x509.h>
72
73 #include "../internal.h"
74
75
76 #define MIN_LENGTH 4
77
78 static int load_iv(char **fromp, unsigned char *to, size_t num);
79 static int check_pem(const char *nm, const char *name);
80
81 // PEM_proc_type appends a Proc-Type header to |buf|, determined by |type|.
PEM_proc_type(char buf[PEM_BUFSIZE],int type)82 static void PEM_proc_type(char buf[PEM_BUFSIZE], int type) {
83 const char *str;
84
85 if (type == PEM_TYPE_ENCRYPTED) {
86 str = "ENCRYPTED";
87 } else if (type == PEM_TYPE_MIC_CLEAR) {
88 str = "MIC-CLEAR";
89 } else if (type == PEM_TYPE_MIC_ONLY) {
90 str = "MIC-ONLY";
91 } else {
92 str = "BAD-TYPE";
93 }
94
95 OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
96 OPENSSL_strlcat(buf, str, PEM_BUFSIZE);
97 OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE);
98 }
99
100 // PEM_dek_info appends a DEK-Info header to |buf|, with an algorithm of |type|
101 // and a single parameter, specified by hex-encoding |len| bytes from |str|.
PEM_dek_info(char buf[PEM_BUFSIZE],const char * type,size_t len,char * str)102 static void PEM_dek_info(char buf[PEM_BUFSIZE], const char *type, size_t len,
103 char *str) {
104 static const unsigned char map[17] = "0123456789ABCDEF";
105
106 OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
107 OPENSSL_strlcat(buf, type, PEM_BUFSIZE);
108 OPENSSL_strlcat(buf, ",", PEM_BUFSIZE);
109 size_t buf_len = strlen(buf);
110 // We must write an additional |2 * len + 2| bytes after |buf_len|, including
111 // the trailing newline and NUL.
112 if (len > (PEM_BUFSIZE - buf_len - 2) / 2) {
113 return;
114 }
115 for (size_t i = 0; i < len; i++) {
116 buf[buf_len + i * 2] = map[(str[i] >> 4) & 0x0f];
117 buf[buf_len + i * 2 + 1] = map[(str[i]) & 0x0f];
118 }
119 buf[buf_len + len * 2] = '\n';
120 buf[buf_len + len * 2 + 1] = '\0';
121 }
122
PEM_ASN1_read(d2i_of_void * d2i,const char * name,FILE * fp,void ** x,pem_password_cb * cb,void * u)123 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
124 pem_password_cb *cb, void *u) {
125 BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
126 if (b == NULL) {
127 OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
128 return NULL;
129 }
130 void *ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
131 BIO_free(b);
132 return ret;
133 }
134
check_pem(const char * nm,const char * name)135 static int check_pem(const char *nm, const char *name) {
136 // Normal matching nm and name
137 if (!strcmp(nm, name)) {
138 return 1;
139 }
140
141 // Make PEM_STRING_EVP_PKEY match any private key
142
143 if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
144 return !strcmp(nm, PEM_STRING_PKCS8) || !strcmp(nm, PEM_STRING_PKCS8INF) ||
145 !strcmp(nm, PEM_STRING_RSA) || !strcmp(nm, PEM_STRING_EC) ||
146 !strcmp(nm, PEM_STRING_DSA);
147 }
148
149 // Permit older strings
150
151 if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509)) {
152 return 1;
153 }
154
155 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
156 !strcmp(name, PEM_STRING_X509_REQ)) {
157 return 1;
158 }
159
160 // Allow normal certs to be read as trusted certs
161 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_X509_TRUSTED)) {
162 return 1;
163 }
164
165 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
166 !strcmp(name, PEM_STRING_X509_TRUSTED)) {
167 return 1;
168 }
169
170 // Some CAs use PKCS#7 with CERTIFICATE headers
171 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7)) {
172 return 1;
173 }
174
175 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && !strcmp(name, PEM_STRING_PKCS7)) {
176 return 1;
177 }
178
179 #ifndef OPENSSL_NO_CMS
180 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS)) {
181 return 1;
182 }
183 // Allow CMS to be read from PKCS#7 headers
184 if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS)) {
185 return 1;
186 }
187 #endif
188
189 return 0;
190 }
191
cipher_by_name(const char * name)192 static const EVP_CIPHER *cipher_by_name(const char *name) {
193 // This is similar to the (deprecated) function |EVP_get_cipherbyname|. Note
194 // the PEM code assumes that ciphers have at least 8 bytes of IV, at most 20
195 // bytes of overhead and generally behave like CBC mode.
196 if (0 == strcmp(name, SN_des_cbc)) {
197 return EVP_des_cbc();
198 } else if (0 == strcmp(name, SN_des_ede3_cbc)) {
199 return EVP_des_ede3_cbc();
200 } else if (0 == strcmp(name, SN_aes_128_cbc)) {
201 return EVP_aes_128_cbc();
202 } else if (0 == strcmp(name, SN_aes_192_cbc)) {
203 return EVP_aes_192_cbc();
204 } else if (0 == strcmp(name, SN_aes_256_cbc)) {
205 return EVP_aes_256_cbc();
206 } else {
207 return NULL;
208 }
209 }
210
PEM_bytes_read_bio(unsigned char ** pdata,long * plen,char ** pnm,const char * name,BIO * bp,pem_password_cb * cb,void * u)211 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
212 const char *name, BIO *bp, pem_password_cb *cb,
213 void *u) {
214 EVP_CIPHER_INFO cipher;
215 char *nm = NULL, *header = NULL;
216 unsigned char *data = NULL;
217 long len;
218 int ret = 0;
219
220 for (;;) {
221 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
222 uint32_t error = ERR_peek_error();
223 if (ERR_GET_LIB(error) == ERR_LIB_PEM &&
224 ERR_GET_REASON(error) == PEM_R_NO_START_LINE) {
225 ERR_add_error_data(2, "Expecting: ", name);
226 }
227 return 0;
228 }
229 if (check_pem(nm, name)) {
230 break;
231 }
232 OPENSSL_free(nm);
233 OPENSSL_free(header);
234 OPENSSL_free(data);
235 }
236 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) {
237 goto err;
238 }
239 if (!PEM_do_header(&cipher, data, &len, cb, u)) {
240 goto err;
241 }
242
243 *pdata = data;
244 *plen = len;
245
246 if (pnm) {
247 *pnm = nm;
248 }
249
250 ret = 1;
251
252 err:
253 if (!ret || !pnm) {
254 OPENSSL_free(nm);
255 }
256 OPENSSL_free(header);
257 if (!ret) {
258 OPENSSL_free(data);
259 }
260 return ret;
261 }
262
PEM_ASN1_write(i2d_of_void * i2d,const char * name,FILE * fp,void * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * callback,void * u)263 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x,
264 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
265 pem_password_cb *callback, void *u) {
266 BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
267 if (b == NULL) {
268 OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
269 return 0;
270 }
271 int ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
272 BIO_free(b);
273 return ret;
274 }
275
PEM_ASN1_write_bio(i2d_of_void * i2d,const char * name,BIO * bp,void * x,const EVP_CIPHER * enc,unsigned char * kstr,int klen,pem_password_cb * callback,void * u)276 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x,
277 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
278 pem_password_cb *callback, void *u) {
279 EVP_CIPHER_CTX ctx;
280 int dsize = 0, i, j, ret = 0;
281 unsigned char *p, *data = NULL;
282 const char *objstr = NULL;
283 char buf[PEM_BUFSIZE];
284 unsigned char key[EVP_MAX_KEY_LENGTH];
285 unsigned char iv[EVP_MAX_IV_LENGTH];
286
287 if (enc != NULL) {
288 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
289 if (objstr == NULL || cipher_by_name(objstr) == NULL ||
290 EVP_CIPHER_iv_length(enc) < 8) {
291 OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_CIPHER);
292 goto err;
293 }
294 }
295
296 if ((dsize = i2d(x, NULL)) < 0) {
297 OPENSSL_PUT_ERROR(PEM, ERR_R_ASN1_LIB);
298 dsize = 0;
299 goto err;
300 }
301 // dzise + 8 bytes are needed
302 // actually it needs the cipher block size extra...
303 data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
304 if (data == NULL) {
305 goto err;
306 }
307 p = data;
308 i = i2d(x, &p);
309
310 if (enc != NULL) {
311 const unsigned iv_len = EVP_CIPHER_iv_length(enc);
312
313 if (kstr == NULL) {
314 klen = 0;
315 if (!callback) {
316 callback = PEM_def_callback;
317 }
318 klen = (*callback)(buf, PEM_BUFSIZE, 1, u);
319 if (klen <= 0) {
320 OPENSSL_PUT_ERROR(PEM, PEM_R_READ_KEY);
321 goto err;
322 }
323 kstr = (unsigned char *)buf;
324 }
325 assert(iv_len <= sizeof(iv));
326 if (!RAND_bytes(iv, iv_len)) { // Generate a salt
327 goto err;
328 }
329 // The 'iv' is used as the iv and as a salt. It is NOT taken from
330 // the BytesToKey function
331 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL)) {
332 goto err;
333 }
334
335 if (kstr == (unsigned char *)buf) {
336 OPENSSL_cleanse(buf, PEM_BUFSIZE);
337 }
338
339 assert(strlen(objstr) + 23 + 2 * iv_len + 13 <= sizeof(buf));
340
341 buf[0] = '\0';
342 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
343 PEM_dek_info(buf, objstr, iv_len, (char *)iv);
344 // k=strlen(buf);
345
346 EVP_CIPHER_CTX_init(&ctx);
347 ret = 1;
348 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) ||
349 !EVP_EncryptUpdate(&ctx, data, &j, data, i) ||
350 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i)) {
351 ret = 0;
352 } else {
353 i += j;
354 }
355 EVP_CIPHER_CTX_cleanup(&ctx);
356 if (ret == 0) {
357 goto err;
358 }
359 } else {
360 ret = 1;
361 buf[0] = '\0';
362 }
363 i = PEM_write_bio(bp, name, buf, data, i);
364 if (i <= 0) {
365 ret = 0;
366 }
367 err:
368 OPENSSL_cleanse(key, sizeof(key));
369 OPENSSL_cleanse(iv, sizeof(iv));
370 OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
371 OPENSSL_cleanse(buf, PEM_BUFSIZE);
372 OPENSSL_free(data);
373 return ret;
374 }
375
PEM_do_header(EVP_CIPHER_INFO * cipher,unsigned char * data,long * plen,pem_password_cb * callback,void * u)376 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
377 pem_password_cb *callback, void *u) {
378 int i = 0, j, o, klen;
379 long len;
380 EVP_CIPHER_CTX ctx;
381 unsigned char key[EVP_MAX_KEY_LENGTH];
382 char buf[PEM_BUFSIZE];
383
384 len = *plen;
385
386 if (cipher->cipher == NULL) {
387 return 1;
388 }
389
390 klen = 0;
391 if (!callback) {
392 callback = PEM_def_callback;
393 }
394 klen = callback(buf, PEM_BUFSIZE, 0, u);
395 if (klen <= 0) {
396 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_PASSWORD_READ);
397 return 0;
398 }
399
400 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
401 (unsigned char *)buf, klen, 1, key, NULL)) {
402 return 0;
403 }
404
405 j = (int)len;
406 EVP_CIPHER_CTX_init(&ctx);
407 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
408 if (o) {
409 o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
410 }
411 if (o) {
412 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
413 }
414 EVP_CIPHER_CTX_cleanup(&ctx);
415 OPENSSL_cleanse((char *)buf, sizeof(buf));
416 OPENSSL_cleanse((char *)key, sizeof(key));
417 if (!o) {
418 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_DECRYPT);
419 return 0;
420 }
421 j += i;
422 *plen = j;
423 return 1;
424 }
425
PEM_get_EVP_CIPHER_INFO(char * header,EVP_CIPHER_INFO * cipher)426 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) {
427 const EVP_CIPHER *enc = NULL;
428 char *p, c;
429 char **header_pp = &header;
430
431 cipher->cipher = NULL;
432 OPENSSL_memset(cipher->iv, 0, sizeof(cipher->iv));
433 if ((header == NULL) || (*header == '\0') || (*header == '\n')) {
434 return 1;
435 }
436 if (strncmp(header, "Proc-Type: ", 11) != 0) {
437 OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_PROC_TYPE);
438 return 0;
439 }
440 header += 11;
441 if (*header != '4') {
442 return 0;
443 }
444 header++;
445 if (*header != ',') {
446 return 0;
447 }
448 header++;
449 if (strncmp(header, "ENCRYPTED", 9) != 0) {
450 OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_ENCRYPTED);
451 return 0;
452 }
453 for (; (*header != '\n') && (*header != '\0'); header++) {
454 ;
455 }
456 if (*header == '\0') {
457 OPENSSL_PUT_ERROR(PEM, PEM_R_SHORT_HEADER);
458 return 0;
459 }
460 header++;
461 if (strncmp(header, "DEK-Info: ", 10) != 0) {
462 OPENSSL_PUT_ERROR(PEM, PEM_R_NOT_DEK_INFO);
463 return 0;
464 }
465 header += 10;
466
467 p = header;
468 for (;;) {
469 c = *header;
470 if (!((c >= 'A' && c <= 'Z') || c == '-' ||
471 OPENSSL_isdigit(c))) {
472 break;
473 }
474 header++;
475 }
476 *header = '\0';
477 cipher->cipher = enc = cipher_by_name(p);
478 *header = c;
479 header++;
480
481 if (enc == NULL) {
482 OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
483 return 0;
484 }
485 // The IV parameter must be at least 8 bytes long to be used as the salt in
486 // the KDF. (This should not happen given |cipher_by_name|.)
487 if (EVP_CIPHER_iv_length(enc) < 8) {
488 assert(0);
489 OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_ENCRYPTION);
490 return 0;
491 }
492 if (!load_iv(header_pp, &(cipher->iv[0]), EVP_CIPHER_iv_length(enc))) {
493 return 0;
494 }
495
496 return 1;
497 }
498
load_iv(char ** fromp,unsigned char * to,size_t num)499 static int load_iv(char **fromp, unsigned char *to, size_t num) {
500 uint8_t v;
501 char *from;
502
503 from = *fromp;
504 for (size_t i = 0; i < num; i++) {
505 to[i] = 0;
506 }
507 num *= 2;
508 for (size_t i = 0; i < num; i++) {
509 if (!OPENSSL_fromxdigit(&v, *from)) {
510 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_IV_CHARS);
511 return 0;
512 }
513 from++;
514 to[i / 2] |= v << (!(i & 1)) * 4;
515 }
516
517 *fromp = from;
518 return 1;
519 }
520
PEM_write(FILE * fp,const char * name,const char * header,const unsigned char * data,long len)521 int PEM_write(FILE *fp, const char *name, const char *header,
522 const unsigned char *data, long len) {
523 BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
524 if (b == NULL) {
525 OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
526 return 0;
527 }
528 int ret = PEM_write_bio(b, name, header, data, len);
529 BIO_free(b);
530 return ret;
531 }
532
PEM_write_bio(BIO * bp,const char * name,const char * header,const unsigned char * data,long len)533 int PEM_write_bio(BIO *bp, const char *name, const char *header,
534 const unsigned char *data, long len) {
535 int nlen, n, i, j, outl;
536 unsigned char *buf = NULL;
537 EVP_ENCODE_CTX ctx;
538 int reason = ERR_R_BUF_LIB;
539
540 EVP_EncodeInit(&ctx);
541 nlen = strlen(name);
542
543 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
544 (BIO_write(bp, name, nlen) != nlen) ||
545 (BIO_write(bp, "-----\n", 6) != 6)) {
546 goto err;
547 }
548
549 i = strlen(header);
550 if (i > 0) {
551 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1)) {
552 goto err;
553 }
554 }
555
556 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
557 if (buf == NULL) {
558 goto err;
559 }
560
561 i = j = 0;
562 while (len > 0) {
563 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
564 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
565 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) {
566 goto err;
567 }
568 i += outl;
569 len -= n;
570 j += n;
571 }
572 EVP_EncodeFinal(&ctx, buf, &outl);
573 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) {
574 goto err;
575 }
576 OPENSSL_free(buf);
577 buf = NULL;
578 if ((BIO_write(bp, "-----END ", 9) != 9) ||
579 (BIO_write(bp, name, nlen) != nlen) ||
580 (BIO_write(bp, "-----\n", 6) != 6)) {
581 goto err;
582 }
583 return i + outl;
584 err:
585 if (buf) {
586 OPENSSL_free(buf);
587 }
588 OPENSSL_PUT_ERROR(PEM, reason);
589 return 0;
590 }
591
PEM_read(FILE * fp,char ** name,char ** header,unsigned char ** data,long * len)592 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
593 long *len) {
594 BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
595 if (b == NULL) {
596 OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
597 return 0;
598 }
599 int ret = PEM_read_bio(b, name, header, data, len);
600 BIO_free(b);
601 return ret;
602 }
603
PEM_read_bio(BIO * bp,char ** name,char ** header,unsigned char ** data,long * len)604 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
605 long *len) {
606 EVP_ENCODE_CTX ctx;
607 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
608 char buf[256];
609 BUF_MEM *nameB;
610 BUF_MEM *headerB;
611 BUF_MEM *dataB, *tmpB;
612
613 nameB = BUF_MEM_new();
614 headerB = BUF_MEM_new();
615 dataB = BUF_MEM_new();
616 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
617 BUF_MEM_free(nameB);
618 BUF_MEM_free(headerB);
619 BUF_MEM_free(dataB);
620 return 0;
621 }
622
623 buf[254] = '\0';
624 for (;;) {
625 i = BIO_gets(bp, buf, 254);
626
627 if (i <= 0) {
628 OPENSSL_PUT_ERROR(PEM, PEM_R_NO_START_LINE);
629 goto err;
630 }
631
632 while ((i >= 0) && (buf[i] <= ' ')) {
633 i--;
634 }
635 buf[++i] = '\n';
636 buf[++i] = '\0';
637
638 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
639 i = strlen(&(buf[11]));
640
641 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) {
642 continue;
643 }
644 if (!BUF_MEM_grow(nameB, i + 9)) {
645 goto err;
646 }
647 OPENSSL_memcpy(nameB->data, &(buf[11]), i - 6);
648 nameB->data[i - 6] = '\0';
649 break;
650 }
651 }
652 hl = 0;
653 if (!BUF_MEM_grow(headerB, 256)) {
654 goto err;
655 }
656 headerB->data[0] = '\0';
657 for (;;) {
658 i = BIO_gets(bp, buf, 254);
659 if (i <= 0) {
660 break;
661 }
662
663 while ((i >= 0) && (buf[i] <= ' ')) {
664 i--;
665 }
666 buf[++i] = '\n';
667 buf[++i] = '\0';
668
669 if (buf[0] == '\n') {
670 break;
671 }
672 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
673 goto err;
674 }
675 if (strncmp(buf, "-----END ", 9) == 0) {
676 nohead = 1;
677 break;
678 }
679 OPENSSL_memcpy(&(headerB->data[hl]), buf, i);
680 headerB->data[hl + i] = '\0';
681 hl += i;
682 }
683
684 bl = 0;
685 if (!BUF_MEM_grow(dataB, 1024)) {
686 goto err;
687 }
688 dataB->data[0] = '\0';
689 if (!nohead) {
690 for (;;) {
691 i = BIO_gets(bp, buf, 254);
692 if (i <= 0) {
693 break;
694 }
695
696 while ((i >= 0) && (buf[i] <= ' ')) {
697 i--;
698 }
699 buf[++i] = '\n';
700 buf[++i] = '\0';
701
702 if (i != 65) {
703 end = 1;
704 }
705 if (strncmp(buf, "-----END ", 9) == 0) {
706 break;
707 }
708 if (i > 65) {
709 break;
710 }
711 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
712 goto err;
713 }
714 OPENSSL_memcpy(&(dataB->data[bl]), buf, i);
715 dataB->data[bl + i] = '\0';
716 bl += i;
717 if (end) {
718 buf[0] = '\0';
719 i = BIO_gets(bp, buf, 254);
720 if (i <= 0) {
721 break;
722 }
723
724 while ((i >= 0) && (buf[i] <= ' ')) {
725 i--;
726 }
727 buf[++i] = '\n';
728 buf[++i] = '\0';
729
730 break;
731 }
732 }
733 } else {
734 tmpB = headerB;
735 headerB = dataB;
736 dataB = tmpB;
737 bl = hl;
738 }
739 i = strlen(nameB->data);
740 if ((strncmp(buf, "-----END ", 9) != 0) ||
741 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
742 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
743 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_END_LINE);
744 goto err;
745 }
746
747 EVP_DecodeInit(&ctx);
748 i = EVP_DecodeUpdate(&ctx, (unsigned char *)dataB->data, &bl,
749 (unsigned char *)dataB->data, bl);
750 if (i < 0) {
751 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_BASE64_DECODE);
752 goto err;
753 }
754 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
755 if (i < 0) {
756 OPENSSL_PUT_ERROR(PEM, PEM_R_BAD_BASE64_DECODE);
757 goto err;
758 }
759 bl += k;
760
761 if (bl == 0) {
762 goto err;
763 }
764 *name = nameB->data;
765 *header = headerB->data;
766 *data = (unsigned char *)dataB->data;
767 *len = bl;
768 OPENSSL_free(nameB);
769 OPENSSL_free(headerB);
770 OPENSSL_free(dataB);
771 return 1;
772 err:
773 BUF_MEM_free(nameB);
774 BUF_MEM_free(headerB);
775 BUF_MEM_free(dataB);
776 return 0;
777 }
778
PEM_def_callback(char * buf,int size,int rwflag,void * userdata)779 int PEM_def_callback(char *buf, int size, int rwflag, void *userdata) {
780 if (!buf || !userdata || size < 0) {
781 return 0;
782 }
783 size_t len = strlen((char *)userdata);
784 if (len >= (size_t)size) {
785 return 0;
786 }
787 OPENSSL_strlcpy(buf, userdata, (size_t)size);
788 return (int)len;
789 }
790