1 /* $OpenBSD: pem_lib.c,v 1.56 2024/02/18 15:44:10 tb Exp $ */
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
59 #include <ctype.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63
64 #include <openssl/opensslconf.h>
65
66 #include <openssl/buffer.h>
67 #include <openssl/err.h>
68 #include <openssl/evp.h>
69 #include <openssl/objects.h>
70 #include <openssl/pem.h>
71 #include <openssl/pkcs12.h>
72 #include <openssl/x509.h>
73
74 #ifndef OPENSSL_NO_DES
75 #include <openssl/des.h>
76 #endif
77
78 #include "asn1_local.h"
79 #include "evp_local.h"
80
81 #define MIN_LENGTH 4
82
83 static int load_iv(char **fromp, unsigned char *to, int num);
84 static int check_pem(const char *nm, const char *name);
85 int pem_check_suffix(const char *pem_str, const char *suffix);
86
87 /* XXX LSSL ABI XXX return value and `num' ought to be size_t */
88 int
PEM_def_callback(char * buf,int num,int w,void * key)89 PEM_def_callback(char *buf, int num, int w, void *key)
90 {
91 size_t l;
92 int i;
93 const char *prompt;
94
95 if (num < 0)
96 return -1;
97
98 if (key) {
99 l = strlen(key);
100 if (l > (size_t)num)
101 l = (size_t)num;
102 memcpy(buf, key, l);
103 return (int)l;
104 }
105
106 prompt = EVP_get_pw_prompt();
107 if (prompt == NULL)
108 prompt = "Enter PEM pass phrase:";
109
110 for (;;) {
111 i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
112 if (i != 0) {
113 PEMerror(PEM_R_PROBLEMS_GETTING_PASSWORD);
114 memset(buf, 0, num);
115 return (-1);
116 }
117 l = strlen(buf);
118 if (l < MIN_LENGTH) {
119 fprintf(stderr, "phrase is too short, "
120 "needs to be at least %zu chars\n",
121 (size_t)MIN_LENGTH);
122 } else
123 break;
124 }
125 return (int)l;
126 }
127 LCRYPTO_ALIAS(PEM_def_callback);
128
129 void
PEM_proc_type(char * buf,int type)130 PEM_proc_type(char *buf, int type)
131 {
132 const char *str;
133
134 if (type == PEM_TYPE_ENCRYPTED)
135 str = "ENCRYPTED";
136 else if (type == PEM_TYPE_MIC_CLEAR)
137 str = "MIC-CLEAR";
138 else if (type == PEM_TYPE_MIC_ONLY)
139 str = "MIC-ONLY";
140 else
141 str = "BAD-TYPE";
142
143 strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
144 strlcat(buf, str, PEM_BUFSIZE);
145 strlcat(buf, "\n", PEM_BUFSIZE);
146 }
147 LCRYPTO_ALIAS(PEM_proc_type);
148
149 void
PEM_dek_info(char * buf,const char * type,int len,char * str)150 PEM_dek_info(char *buf, const char *type, int len, char *str)
151 {
152 static const unsigned char map[17] = "0123456789ABCDEF";
153 long i;
154 int j;
155
156 strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
157 strlcat(buf, type, PEM_BUFSIZE);
158 strlcat(buf, ",", PEM_BUFSIZE);
159 j = strlen(buf);
160 if (j + (len * 2) + 1 > PEM_BUFSIZE)
161 return;
162 for (i = 0; i < len; i++) {
163 buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
164 buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
165 }
166 buf[j + i * 2] = '\n';
167 buf[j + i * 2 + 1] = '\0';
168 }
169 LCRYPTO_ALIAS(PEM_dek_info);
170
171 void *
PEM_ASN1_read(d2i_of_void * d2i,const char * name,FILE * fp,void ** x,pem_password_cb * cb,void * u)172 PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
173 pem_password_cb *cb, void *u)
174 {
175 BIO *b;
176 void *ret;
177
178 if ((b = BIO_new(BIO_s_file())) == NULL) {
179 PEMerror(ERR_R_BUF_LIB);
180 return (0);
181 }
182 BIO_set_fp(b, fp, BIO_NOCLOSE);
183 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
184 BIO_free(b);
185 return (ret);
186 }
187 LCRYPTO_ALIAS(PEM_ASN1_read);
188
189 static int
check_pem(const char * nm,const char * name)190 check_pem(const char *nm, const char *name)
191 {
192 /* Normal matching nm and name */
193 if (!strcmp(nm, name))
194 return 1;
195
196 /* Make PEM_STRING_EVP_PKEY match any private key */
197
198 if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
199 int slen;
200 const EVP_PKEY_ASN1_METHOD *ameth;
201 if (!strcmp(nm, PEM_STRING_PKCS8))
202 return 1;
203 if (!strcmp(nm, PEM_STRING_PKCS8INF))
204 return 1;
205 slen = pem_check_suffix(nm, "PRIVATE KEY");
206 if (slen > 0) {
207 /* NB: ENGINE implementations wont contain
208 * a deprecated old private key decode function
209 * so don't look for them.
210 */
211 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
212 if (ameth && ameth->old_priv_decode)
213 return 1;
214 }
215 return 0;
216 }
217
218 if (!strcmp(name, PEM_STRING_PARAMETERS)) {
219 int slen;
220 const EVP_PKEY_ASN1_METHOD *ameth;
221 slen = pem_check_suffix(nm, "PARAMETERS");
222 if (slen > 0) {
223 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
224 if (ameth) {
225 int r;
226 if (ameth->param_decode)
227 r = 1;
228 else
229 r = 0;
230 return r;
231 }
232 }
233 return 0;
234 }
235
236 /* Permit older strings */
237
238 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
239 !strcmp(name, PEM_STRING_X509))
240 return 1;
241
242 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
243 !strcmp(name, PEM_STRING_X509_REQ))
244 return 1;
245
246 /* Allow normal certs to be read as trusted certs */
247 if (!strcmp(nm, PEM_STRING_X509) &&
248 !strcmp(name, PEM_STRING_X509_TRUSTED))
249 return 1;
250
251 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
252 !strcmp(name, PEM_STRING_X509_TRUSTED))
253 return 1;
254
255 /* Some CAs use PKCS#7 with CERTIFICATE headers */
256 if (!strcmp(nm, PEM_STRING_X509) &&
257 !strcmp(name, PEM_STRING_PKCS7))
258 return 1;
259
260 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
261 !strcmp(name, PEM_STRING_PKCS7))
262 return 1;
263
264 #ifndef OPENSSL_NO_CMS
265 if (strcmp(nm, PEM_STRING_X509) == 0 &&
266 strcmp(name, PEM_STRING_CMS) == 0)
267 return 1;
268
269 /* Allow CMS to be read from PKCS#7 headers */
270 if (strcmp(nm, PEM_STRING_PKCS7) == 0 &&
271 strcmp(name, PEM_STRING_CMS) == 0)
272 return 1;
273 #endif
274
275 return 0;
276 }
277
278 int
PEM_bytes_read_bio(unsigned char ** pdata,long * plen,char ** pnm,const char * name,BIO * bp,pem_password_cb * cb,void * u)279 PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
280 const char *name, BIO *bp, pem_password_cb *cb, void *u)
281 {
282 EVP_CIPHER_INFO cipher;
283 char *nm = NULL, *header = NULL;
284 unsigned char *data = NULL;
285 long len;
286 int ret = 0;
287
288 for (;;) {
289 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
290 if (ERR_GET_REASON(ERR_peek_error()) ==
291 PEM_R_NO_START_LINE)
292 ERR_asprintf_error_data("Expecting: %s", name);
293 return 0;
294 }
295 if (check_pem(nm, name))
296 break;
297 free(nm);
298 free(header);
299 free(data);
300 }
301 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
302 goto err;
303 if (!PEM_do_header(&cipher, data, &len, cb, u))
304 goto err;
305
306 *pdata = data;
307 *plen = len;
308
309 if (pnm)
310 *pnm = nm;
311
312 ret = 1;
313
314 err:
315 if (!ret || !pnm)
316 free(nm);
317 free(header);
318 if (!ret)
319 free(data);
320 return ret;
321 }
322 LCRYPTO_ALIAS(PEM_bytes_read_bio);
323
324 int
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)325 PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x,
326 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
327 pem_password_cb *callback, void *u)
328 {
329 BIO *b;
330 int ret;
331
332 if ((b = BIO_new(BIO_s_file())) == NULL) {
333 PEMerror(ERR_R_BUF_LIB);
334 return (0);
335 }
336 BIO_set_fp(b, fp, BIO_NOCLOSE);
337 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
338 BIO_free(b);
339 return (ret);
340 }
341 LCRYPTO_ALIAS(PEM_ASN1_write);
342
343 int
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)344 PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x,
345 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
346 pem_password_cb *callback, void *u)
347 {
348 EVP_CIPHER_CTX ctx;
349 int dsize = 0, i, j, ret = 0;
350 unsigned char *p, *data = NULL;
351 const char *objstr = NULL;
352 char buf[PEM_BUFSIZE];
353 unsigned char key[EVP_MAX_KEY_LENGTH];
354 unsigned char iv[EVP_MAX_IV_LENGTH];
355
356 if (enc != NULL) {
357 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
358 if (objstr == NULL) {
359 PEMerror(PEM_R_UNSUPPORTED_CIPHER);
360 goto err;
361 }
362 }
363
364 if ((dsize = i2d(x, NULL)) < 0) {
365 PEMerror(ERR_R_ASN1_LIB);
366 dsize = 0;
367 goto err;
368 }
369 /* dzise + 8 bytes are needed */
370 /* actually it needs the cipher block size extra... */
371 data = malloc(dsize + 20);
372 if (data == NULL) {
373 PEMerror(ERR_R_MALLOC_FAILURE);
374 goto err;
375 }
376 p = data;
377 i = i2d(x, &p);
378
379 if (enc != NULL) {
380 if (kstr == NULL) {
381 if (callback == NULL)
382 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
383 else
384 klen = (*callback)(buf, PEM_BUFSIZE, 1, u);
385 if (klen <= 0) {
386 PEMerror(PEM_R_READ_KEY);
387 goto err;
388 }
389 kstr = (unsigned char *)buf;
390 }
391 if ((size_t)enc->iv_len > sizeof(iv)) {
392 PEMerror(EVP_R_IV_TOO_LARGE);
393 goto err;
394 }
395 arc4random_buf(iv, enc->iv_len); /* Generate a salt */
396 /* The 'iv' is used as the iv and as a salt. It is
397 * NOT taken from the BytesToKey function */
398 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1,
399 key, NULL))
400 goto err;
401
402 if (kstr == (unsigned char *)buf)
403 explicit_bzero(buf, PEM_BUFSIZE);
404
405 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) {
406 PEMerror(ASN1_R_BUFFER_TOO_SMALL);
407 goto err;
408 }
409
410 buf[0] = '\0';
411 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
412 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
413 /* k=strlen(buf); */
414
415 EVP_CIPHER_CTX_legacy_clear(&ctx);
416 ret = 1;
417 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) ||
418 !EVP_EncryptUpdate(&ctx, data, &j, data, i) ||
419 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
420 ret = 0;
421 EVP_CIPHER_CTX_cleanup(&ctx);
422 if (ret == 0)
423 goto err;
424 i += j;
425 } else {
426 ret = 1;
427 buf[0] = '\0';
428 }
429 i = PEM_write_bio(bp, name, buf, data, i);
430 if (i <= 0)
431 ret = 0;
432 err:
433 explicit_bzero(key, sizeof(key));
434 explicit_bzero(iv, sizeof(iv));
435 explicit_bzero((char *)&ctx, sizeof(ctx));
436 explicit_bzero(buf, PEM_BUFSIZE);
437 freezero(data, (unsigned int)dsize);
438 return (ret);
439 }
440 LCRYPTO_ALIAS(PEM_ASN1_write_bio);
441
442 int
PEM_do_header(EVP_CIPHER_INFO * cipher,unsigned char * data,long * plen,pem_password_cb * callback,void * u)443 PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
444 pem_password_cb *callback, void *u)
445 {
446 int i, j, o, klen;
447 long len;
448 EVP_CIPHER_CTX ctx;
449 unsigned char key[EVP_MAX_KEY_LENGTH];
450 char buf[PEM_BUFSIZE];
451
452 len = *plen;
453
454 if (cipher->cipher == NULL)
455 return (1);
456 if (callback == NULL)
457 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
458 else
459 klen = callback(buf, PEM_BUFSIZE, 0, u);
460 if (klen <= 0) {
461 PEMerror(PEM_R_BAD_PASSWORD_READ);
462 return (0);
463 }
464 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
465 (unsigned char *)buf, klen, 1, key, NULL))
466 return 0;
467
468 j = (int)len;
469 EVP_CIPHER_CTX_legacy_clear(&ctx);
470 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key,
471 &(cipher->iv[0]));
472 if (o)
473 o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
474 if (o)
475 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
476 EVP_CIPHER_CTX_cleanup(&ctx);
477 explicit_bzero((char *)buf, sizeof(buf));
478 explicit_bzero((char *)key, sizeof(key));
479 if (!o) {
480 PEMerror(PEM_R_BAD_DECRYPT);
481 return (0);
482 }
483 *plen = j + i;
484 return (1);
485 }
486 LCRYPTO_ALIAS(PEM_do_header);
487
488 int
PEM_get_EVP_CIPHER_INFO(char * header,EVP_CIPHER_INFO * cipher)489 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
490 {
491 const EVP_CIPHER *enc = NULL;
492 char *p, c;
493 char **header_pp = &header;
494
495 cipher->cipher = NULL;
496 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
497 return (1);
498 if (strncmp(header, "Proc-Type: ", 11) != 0) {
499 PEMerror(PEM_R_NOT_PROC_TYPE);
500 return (0);
501 }
502 header += 11;
503 if (*header != '4')
504 return (0);
505 header++;
506 if (*header != ',')
507 return (0);
508 header++;
509 if (strncmp(header, "ENCRYPTED", 9) != 0) {
510 PEMerror(PEM_R_NOT_ENCRYPTED);
511 return (0);
512 }
513 for (; (*header != '\n') && (*header != '\0'); header++)
514 ;
515 if (*header == '\0') {
516 PEMerror(PEM_R_SHORT_HEADER);
517 return (0);
518 }
519 header++;
520 if (strncmp(header, "DEK-Info: ", 10) != 0) {
521 PEMerror(PEM_R_NOT_DEK_INFO);
522 return (0);
523 }
524 header += 10;
525
526 p = header;
527 for (;;) {
528 c= *header;
529 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') ||
530 ((c >= '0') && (c <= '9'))))
531 break;
532 header++;
533 }
534 *header = '\0';
535 cipher->cipher = enc = EVP_get_cipherbyname(p);
536 *header = c;
537 header++;
538
539 if (enc == NULL) {
540 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION);
541 return (0);
542 }
543 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
544 return (0);
545
546 return (1);
547 }
548 LCRYPTO_ALIAS(PEM_get_EVP_CIPHER_INFO);
549
550 static int
load_iv(char ** fromp,unsigned char * to,int num)551 load_iv(char **fromp, unsigned char *to, int num)
552 {
553 int v, i;
554 char *from;
555
556 from= *fromp;
557 for (i = 0; i < num; i++)
558 to[i] = 0;
559 num *= 2;
560 for (i = 0; i < num; i++) {
561 if ((*from >= '0') && (*from <= '9'))
562 v = *from - '0';
563 else if ((*from >= 'A') && (*from <= 'F'))
564 v = *from - 'A' + 10;
565 else if ((*from >= 'a') && (*from <= 'f'))
566 v = *from - 'a' + 10;
567 else {
568 PEMerror(PEM_R_BAD_IV_CHARS);
569 return (0);
570 }
571 from++;
572 to[i / 2] |= v << (long)((!(i & 1)) * 4);
573 }
574
575 *fromp = from;
576 return (1);
577 }
578
579 int
PEM_write(FILE * fp,const char * name,const char * header,const unsigned char * data,long len)580 PEM_write(FILE *fp, const char *name, const char *header,
581 const unsigned char *data, long len)
582 {
583 BIO *b;
584 int ret;
585
586 if ((b = BIO_new(BIO_s_file())) == NULL) {
587 PEMerror(ERR_R_BUF_LIB);
588 return (0);
589 }
590 BIO_set_fp(b, fp, BIO_NOCLOSE);
591 ret = PEM_write_bio(b, name, header, data, len);
592 BIO_free(b);
593 return (ret);
594 }
595 LCRYPTO_ALIAS(PEM_write);
596
597 int
PEM_write_bio(BIO * bp,const char * name,const char * header,const unsigned char * data,long len)598 PEM_write_bio(BIO *bp, const char *name, const char *header,
599 const unsigned char *data, long len)
600 {
601 int nlen, n, i, j, outl;
602 unsigned char *buf = NULL;
603 EVP_ENCODE_CTX ctx;
604 int reason = ERR_R_BUF_LIB;
605
606 EVP_EncodeInit(&ctx);
607 nlen = strlen(name);
608
609 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
610 (BIO_write(bp, name, nlen) != nlen) ||
611 (BIO_write(bp, "-----\n", 6) != 6))
612 goto err;
613
614 if (header != NULL && (i = strlen(header)) > 0) {
615 if ((BIO_write(bp, header, i) != i) ||
616 (BIO_write(bp, "\n", 1) != 1))
617 goto err;
618 }
619
620 buf = reallocarray(NULL, PEM_BUFSIZE, 8);
621 if (buf == NULL) {
622 reason = ERR_R_MALLOC_FAILURE;
623 goto err;
624 }
625
626 i = j = 0;
627 while (len > 0) {
628 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
629 if (!EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n))
630 goto err;
631 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
632 goto err;
633 i += outl;
634 len -= n;
635 j += n;
636 }
637 EVP_EncodeFinal(&ctx, buf, &outl);
638 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
639 goto err;
640 freezero(buf, PEM_BUFSIZE * 8);
641 buf = NULL;
642 if ((BIO_write(bp, "-----END ", 9) != 9) ||
643 (BIO_write(bp, name, nlen) != nlen) ||
644 (BIO_write(bp, "-----\n", 6) != 6))
645 goto err;
646 return (i + outl);
647
648 err:
649 freezero(buf, PEM_BUFSIZE * 8);
650 PEMerror(reason);
651 return (0);
652 }
653 LCRYPTO_ALIAS(PEM_write_bio);
654
655 int
PEM_read(FILE * fp,char ** name,char ** header,unsigned char ** data,long * len)656 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len)
657 {
658 BIO *b;
659 int ret;
660
661 if ((b = BIO_new(BIO_s_file())) == NULL) {
662 PEMerror(ERR_R_BUF_LIB);
663 return (0);
664 }
665 BIO_set_fp(b, fp, BIO_NOCLOSE);
666 ret = PEM_read_bio(b, name, header, data, len);
667 BIO_free(b);
668 return (ret);
669 }
670 LCRYPTO_ALIAS(PEM_read);
671
672 int
PEM_read_bio(BIO * bp,char ** name,char ** header,unsigned char ** data,long * len)673 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
674 long *len)
675 {
676 EVP_ENCODE_CTX ctx;
677 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
678 char buf[256];
679 BUF_MEM *nameB;
680 BUF_MEM *headerB;
681 BUF_MEM *dataB, *tmpB;
682
683 nameB = BUF_MEM_new();
684 headerB = BUF_MEM_new();
685 dataB = BUF_MEM_new();
686 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
687 BUF_MEM_free(nameB);
688 BUF_MEM_free(headerB);
689 BUF_MEM_free(dataB);
690 PEMerror(ERR_R_MALLOC_FAILURE);
691 return (0);
692 }
693
694 buf[254] = '\0';
695 for (;;) {
696 i = BIO_gets(bp, buf, 254);
697
698 if (i <= 0) {
699 PEMerror(PEM_R_NO_START_LINE);
700 goto err;
701 }
702
703 while ((i >= 0) && (buf[i] <= ' '))
704 i--;
705 buf[++i] = '\n';
706 buf[++i] = '\0';
707
708 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
709 i = strlen(&(buf[11]));
710
711 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
712 continue;
713 if (!BUF_MEM_grow(nameB, i + 9)) {
714 PEMerror(ERR_R_MALLOC_FAILURE);
715 goto err;
716 }
717 memcpy(nameB->data, &(buf[11]), i - 6);
718 nameB->data[i - 6] = '\0';
719 break;
720 }
721 }
722 hl = 0;
723 if (!BUF_MEM_grow(headerB, 256)) {
724 PEMerror(ERR_R_MALLOC_FAILURE);
725 goto err;
726 }
727 headerB->data[0] = '\0';
728 for (;;) {
729 i = BIO_gets(bp, buf, 254);
730 if (i <= 0)
731 break;
732
733 while ((i >= 0) && (buf[i] <= ' '))
734 i--;
735 buf[++i] = '\n';
736 buf[++i] = '\0';
737
738 if (buf[0] == '\n')
739 break;
740 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
741 PEMerror(ERR_R_MALLOC_FAILURE);
742 goto err;
743 }
744 if (strncmp(buf, "-----END ", 9) == 0) {
745 nohead = 1;
746 break;
747 }
748 memcpy(&(headerB->data[hl]), buf, i);
749 headerB->data[hl + i] = '\0';
750 hl += i;
751 }
752
753 bl = 0;
754 if (!BUF_MEM_grow(dataB, 1024)) {
755 PEMerror(ERR_R_MALLOC_FAILURE);
756 goto err;
757 }
758 dataB->data[0] = '\0';
759 if (!nohead) {
760 for (;;) {
761 i = BIO_gets(bp, buf, 254);
762 if (i <= 0)
763 break;
764
765 while ((i >= 0) && (buf[i] <= ' '))
766 i--;
767 buf[++i] = '\n';
768 buf[++i] = '\0';
769
770 if (i != 65)
771 end = 1;
772 if (strncmp(buf, "-----END ", 9) == 0)
773 break;
774 if (i > 65)
775 break;
776 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
777 PEMerror(ERR_R_MALLOC_FAILURE);
778 goto err;
779 }
780 memcpy(&(dataB->data[bl]), buf, i);
781 dataB->data[bl + i] = '\0';
782 bl += i;
783 if (end) {
784 buf[0] = '\0';
785 i = BIO_gets(bp, buf, 254);
786 if (i <= 0)
787 break;
788
789 while ((i >= 0) && (buf[i] <= ' '))
790 i--;
791 buf[++i] = '\n';
792 buf[++i] = '\0';
793
794 break;
795 }
796 }
797 } else {
798 tmpB = headerB;
799 headerB = dataB;
800 dataB = tmpB;
801 bl = hl;
802 }
803 i = strlen(nameB->data);
804 if ((strncmp(buf, "-----END ", 9) != 0) ||
805 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
806 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
807 PEMerror(PEM_R_BAD_END_LINE);
808 goto err;
809 }
810
811 EVP_DecodeInit(&ctx);
812 i = EVP_DecodeUpdate(&ctx,
813 (unsigned char *)dataB->data, &bl,
814 (unsigned char *)dataB->data, bl);
815 if (i < 0) {
816 PEMerror(PEM_R_BAD_BASE64_DECODE);
817 goto err;
818 }
819 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
820 if (i < 0) {
821 PEMerror(PEM_R_BAD_BASE64_DECODE);
822 goto err;
823 }
824 bl += k;
825
826 if (bl == 0)
827 goto err;
828 *name = nameB->data;
829 *header = headerB->data;
830 *data = (unsigned char *)dataB->data;
831 *len = bl;
832 free(nameB);
833 free(headerB);
834 free(dataB);
835 return (1);
836
837 err:
838 BUF_MEM_free(nameB);
839 BUF_MEM_free(headerB);
840 BUF_MEM_free(dataB);
841 return (0);
842 }
843 LCRYPTO_ALIAS(PEM_read_bio);
844
845 /* Check pem string and return prefix length.
846 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY"
847 * the return value is 3 for the string "RSA".
848 */
849
850 int
pem_check_suffix(const char * pem_str,const char * suffix)851 pem_check_suffix(const char *pem_str, const char *suffix)
852 {
853 int pem_len = strlen(pem_str);
854 int suffix_len = strlen(suffix);
855 const char *p;
856
857 if (suffix_len + 1 >= pem_len)
858 return 0;
859 p = pem_str + pem_len - suffix_len;
860 if (strcmp(p, suffix))
861 return 0;
862 p--;
863 if (*p != ' ')
864 return 0;
865 return p - pem_str;
866 }
867