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