1 /* $OpenBSD: pem_lib.c,v 1.51 2022/07/31 09:48:27 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 #ifndef OPENSSL_NO_ENGINE
78 #include <openssl/engine.h>
79 #endif
80
81 #include "asn1_locl.h"
82 #include "evp_locl.h"
83
84 #define MIN_LENGTH 4
85
86 static int load_iv(char **fromp, unsigned char *to, int num);
87 static int check_pem(const char *nm, const char *name);
88 int pem_check_suffix(const char *pem_str, const char *suffix);
89
90 /* XXX LSSL ABI XXX return value and `num' ought to be size_t */
91 int
PEM_def_callback(char * buf,int num,int w,void * key)92 PEM_def_callback(char *buf, int num, int w, void *key)
93 {
94 size_t l;
95 int i;
96 const char *prompt;
97
98 if (num < 0)
99 return -1;
100
101 if (key) {
102 l = strlen(key);
103 if (l > (size_t)num)
104 l = (size_t)num;
105 memcpy(buf, key, l);
106 return (int)l;
107 }
108
109 prompt = EVP_get_pw_prompt();
110 if (prompt == NULL)
111 prompt = "Enter PEM pass phrase:";
112
113 for (;;) {
114 i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
115 if (i != 0) {
116 PEMerror(PEM_R_PROBLEMS_GETTING_PASSWORD);
117 memset(buf, 0, num);
118 return (-1);
119 }
120 l = strlen(buf);
121 if (l < MIN_LENGTH) {
122 fprintf(stderr, "phrase is too short, "
123 "needs to be at least %zu chars\n",
124 (size_t)MIN_LENGTH);
125 } else
126 break;
127 }
128 return (int)l;
129 }
130
131 void
PEM_proc_type(char * buf,int type)132 PEM_proc_type(char *buf, int type)
133 {
134 const char *str;
135
136 if (type == PEM_TYPE_ENCRYPTED)
137 str = "ENCRYPTED";
138 else if (type == PEM_TYPE_MIC_CLEAR)
139 str = "MIC-CLEAR";
140 else if (type == PEM_TYPE_MIC_ONLY)
141 str = "MIC-ONLY";
142 else
143 str = "BAD-TYPE";
144
145 strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
146 strlcat(buf, str, PEM_BUFSIZE);
147 strlcat(buf, "\n", PEM_BUFSIZE);
148 }
149
150 void
PEM_dek_info(char * buf,const char * type,int len,char * str)151 PEM_dek_info(char *buf, const char *type, int len, char *str)
152 {
153 static const unsigned char map[17] = "0123456789ABCDEF";
154 long i;
155 int j;
156
157 strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
158 strlcat(buf, type, PEM_BUFSIZE);
159 strlcat(buf, ",", PEM_BUFSIZE);
160 j = strlen(buf);
161 if (j + (len * 2) + 1 > PEM_BUFSIZE)
162 return;
163 for (i = 0; i < len; i++) {
164 buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
165 buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
166 }
167 buf[j + i * 2] = '\n';
168 buf[j + i * 2 + 1] = '\0';
169 }
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
188 static int
check_pem(const char * nm,const char * name)189 check_pem(const char *nm, const char *name)
190 {
191 /* Normal matching nm and name */
192 if (!strcmp(nm, name))
193 return 1;
194
195 /* Make PEM_STRING_EVP_PKEY match any private key */
196
197 if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
198 int slen;
199 const EVP_PKEY_ASN1_METHOD *ameth;
200 if (!strcmp(nm, PEM_STRING_PKCS8))
201 return 1;
202 if (!strcmp(nm, PEM_STRING_PKCS8INF))
203 return 1;
204 slen = pem_check_suffix(nm, "PRIVATE KEY");
205 if (slen > 0) {
206 /* NB: ENGINE implementations wont contain
207 * a deprecated old private key decode function
208 * so don't look for them.
209 */
210 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
211 if (ameth && ameth->old_priv_decode)
212 return 1;
213 }
214 return 0;
215 }
216
217 if (!strcmp(name, PEM_STRING_PARAMETERS)) {
218 int slen;
219 const EVP_PKEY_ASN1_METHOD *ameth;
220 slen = pem_check_suffix(nm, "PARAMETERS");
221 if (slen > 0) {
222 ENGINE *e;
223 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
224 if (ameth) {
225 int r;
226 if (ameth->param_decode)
227 r = 1;
228 else
229 r = 0;
230 #ifndef OPENSSL_NO_ENGINE
231 ENGINE_finish(e);
232 #endif
233 return r;
234 }
235 }
236 return 0;
237 }
238
239 /* Permit older strings */
240
241 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
242 !strcmp(name, PEM_STRING_X509))
243 return 1;
244
245 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
246 !strcmp(name, PEM_STRING_X509_REQ))
247 return 1;
248
249 /* Allow normal certs to be read as trusted certs */
250 if (!strcmp(nm, PEM_STRING_X509) &&
251 !strcmp(name, PEM_STRING_X509_TRUSTED))
252 return 1;
253
254 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
255 !strcmp(name, PEM_STRING_X509_TRUSTED))
256 return 1;
257
258 /* Some CAs use PKCS#7 with CERTIFICATE headers */
259 if (!strcmp(nm, PEM_STRING_X509) &&
260 !strcmp(name, PEM_STRING_PKCS7))
261 return 1;
262
263 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
264 !strcmp(name, PEM_STRING_PKCS7))
265 return 1;
266
267 #ifndef OPENSSL_NO_CMS
268 if (strcmp(nm, PEM_STRING_X509) == 0 &&
269 strcmp(name, PEM_STRING_CMS) == 0)
270 return 1;
271
272 /* Allow CMS to be read from PKCS#7 headers */
273 if (strcmp(nm, PEM_STRING_PKCS7) == 0 &&
274 strcmp(name, PEM_STRING_CMS) == 0)
275 return 1;
276 #endif
277
278 return 0;
279 }
280
281 int
PEM_bytes_read_bio(unsigned char ** pdata,long * plen,char ** pnm,const char * name,BIO * bp,pem_password_cb * cb,void * u)282 PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
283 const char *name, BIO *bp, pem_password_cb *cb, void *u)
284 {
285 EVP_CIPHER_INFO cipher;
286 char *nm = NULL, *header = NULL;
287 unsigned char *data = NULL;
288 long len;
289 int ret = 0;
290
291 for (;;) {
292 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
293 if (ERR_GET_REASON(ERR_peek_error()) ==
294 PEM_R_NO_START_LINE)
295 ERR_asprintf_error_data("Expecting: %s", name);
296 return 0;
297 }
298 if (check_pem(nm, name))
299 break;
300 free(nm);
301 free(header);
302 free(data);
303 }
304 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
305 goto err;
306 if (!PEM_do_header(&cipher, data, &len, cb, u))
307 goto err;
308
309 *pdata = data;
310 *plen = len;
311
312 if (pnm)
313 *pnm = nm;
314
315 ret = 1;
316
317 err:
318 if (!ret || !pnm)
319 free(nm);
320 free(header);
321 if (!ret)
322 free(data);
323 return ret;
324 }
325
326 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)327 PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x,
328 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
329 pem_password_cb *callback, void *u)
330 {
331 BIO *b;
332 int ret;
333
334 if ((b = BIO_new(BIO_s_file())) == NULL) {
335 PEMerror(ERR_R_BUF_LIB);
336 return (0);
337 }
338 BIO_set_fp(b, fp, BIO_NOCLOSE);
339 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
340 BIO_free(b);
341 return (ret);
342 }
343
344 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)345 PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x,
346 const EVP_CIPHER *enc, unsigned char *kstr, int klen,
347 pem_password_cb *callback, void *u)
348 {
349 EVP_CIPHER_CTX ctx;
350 int dsize = 0, i, j, ret = 0;
351 unsigned char *p, *data = NULL;
352 const char *objstr = NULL;
353 char buf[PEM_BUFSIZE];
354 unsigned char key[EVP_MAX_KEY_LENGTH];
355 unsigned char iv[EVP_MAX_IV_LENGTH];
356
357 if (enc != NULL) {
358 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
359 if (objstr == NULL) {
360 PEMerror(PEM_R_UNSUPPORTED_CIPHER);
361 goto err;
362 }
363 }
364
365 if ((dsize = i2d(x, NULL)) < 0) {
366 PEMerror(ERR_R_ASN1_LIB);
367 dsize = 0;
368 goto err;
369 }
370 /* dzise + 8 bytes are needed */
371 /* actually it needs the cipher block size extra... */
372 data = malloc(dsize + 20);
373 if (data == NULL) {
374 PEMerror(ERR_R_MALLOC_FAILURE);
375 goto err;
376 }
377 p = data;
378 i = i2d(x, &p);
379
380 if (enc != NULL) {
381 if (kstr == NULL) {
382 if (callback == NULL)
383 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
384 else
385 klen = (*callback)(buf, PEM_BUFSIZE, 1, u);
386 if (klen <= 0) {
387 PEMerror(PEM_R_READ_KEY);
388 goto err;
389 }
390 kstr = (unsigned char *)buf;
391 }
392 if ((size_t)enc->iv_len > sizeof(iv)) {
393 PEMerror(EVP_R_IV_TOO_LARGE);
394 goto err;
395 }
396 arc4random_buf(iv, enc->iv_len); /* Generate a salt */
397 /* The 'iv' is used as the iv and as a salt. It is
398 * NOT taken from the BytesToKey function */
399 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1,
400 key, NULL))
401 goto err;
402
403 if (kstr == (unsigned char *)buf)
404 explicit_bzero(buf, PEM_BUFSIZE);
405
406 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) {
407 PEMerror(ASN1_R_BUFFER_TOO_SMALL);
408 goto err;
409 }
410
411 buf[0] = '\0';
412 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
413 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
414 /* k=strlen(buf); */
415
416 EVP_CIPHER_CTX_init(&ctx);
417 ret = 1;
418 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) ||
419 !EVP_EncryptUpdate(&ctx, data, &j, data, i) ||
420 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
421 ret = 0;
422 EVP_CIPHER_CTX_cleanup(&ctx);
423 if (ret == 0)
424 goto err;
425 i += j;
426 } else {
427 ret = 1;
428 buf[0] = '\0';
429 }
430 i = PEM_write_bio(bp, name, buf, data, i);
431 if (i <= 0)
432 ret = 0;
433 err:
434 explicit_bzero(key, sizeof(key));
435 explicit_bzero(iv, sizeof(iv));
436 explicit_bzero((char *)&ctx, sizeof(ctx));
437 explicit_bzero(buf, PEM_BUFSIZE);
438 freezero(data, (unsigned int)dsize);
439 return (ret);
440 }
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_init(&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
487 int
PEM_get_EVP_CIPHER_INFO(char * header,EVP_CIPHER_INFO * cipher)488 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
489 {
490 const EVP_CIPHER *enc = NULL;
491 char *p, c;
492 char **header_pp = &header;
493
494 cipher->cipher = NULL;
495 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
496 return (1);
497 if (strncmp(header, "Proc-Type: ", 11) != 0) {
498 PEMerror(PEM_R_NOT_PROC_TYPE);
499 return (0);
500 }
501 header += 11;
502 if (*header != '4')
503 return (0);
504 header++;
505 if (*header != ',')
506 return (0);
507 header++;
508 if (strncmp(header, "ENCRYPTED", 9) != 0) {
509 PEMerror(PEM_R_NOT_ENCRYPTED);
510 return (0);
511 }
512 for (; (*header != '\n') && (*header != '\0'); header++)
513 ;
514 if (*header == '\0') {
515 PEMerror(PEM_R_SHORT_HEADER);
516 return (0);
517 }
518 header++;
519 if (strncmp(header, "DEK-Info: ", 10) != 0) {
520 PEMerror(PEM_R_NOT_DEK_INFO);
521 return (0);
522 }
523 header += 10;
524
525 p = header;
526 for (;;) {
527 c= *header;
528 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') ||
529 ((c >= '0') && (c <= '9'))))
530 break;
531 header++;
532 }
533 *header = '\0';
534 cipher->cipher = enc = EVP_get_cipherbyname(p);
535 *header = c;
536 header++;
537
538 if (enc == NULL) {
539 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION);
540 return (0);
541 }
542 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
543 return (0);
544
545 return (1);
546 }
547
548 static int
load_iv(char ** fromp,unsigned char * to,int num)549 load_iv(char **fromp, unsigned char *to, int num)
550 {
551 int v, i;
552 char *from;
553
554 from= *fromp;
555 for (i = 0; i < num; i++)
556 to[i] = 0;
557 num *= 2;
558 for (i = 0; i < num; i++) {
559 if ((*from >= '0') && (*from <= '9'))
560 v = *from - '0';
561 else if ((*from >= 'A') && (*from <= 'F'))
562 v = *from - 'A' + 10;
563 else if ((*from >= 'a') && (*from <= 'f'))
564 v = *from - 'a' + 10;
565 else {
566 PEMerror(PEM_R_BAD_IV_CHARS);
567 return (0);
568 }
569 from++;
570 to[i / 2] |= v << (long)((!(i & 1)) * 4);
571 }
572
573 *fromp = from;
574 return (1);
575 }
576
577 int
PEM_write(FILE * fp,const char * name,const char * header,const unsigned char * data,long len)578 PEM_write(FILE *fp, const char *name, const char *header,
579 const unsigned char *data, long len)
580 {
581 BIO *b;
582 int ret;
583
584 if ((b = BIO_new(BIO_s_file())) == NULL) {
585 PEMerror(ERR_R_BUF_LIB);
586 return (0);
587 }
588 BIO_set_fp(b, fp, BIO_NOCLOSE);
589 ret = PEM_write_bio(b, name, header, data, len);
590 BIO_free(b);
591 return (ret);
592 }
593
594 int
PEM_write_bio(BIO * bp,const char * name,const char * header,const unsigned char * data,long len)595 PEM_write_bio(BIO *bp, const char *name, const char *header,
596 const unsigned char *data, long len)
597 {
598 int nlen, n, i, j, outl;
599 unsigned char *buf = NULL;
600 EVP_ENCODE_CTX ctx;
601 int reason = ERR_R_BUF_LIB;
602
603 EVP_EncodeInit(&ctx);
604 nlen = strlen(name);
605
606 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
607 (BIO_write(bp, name, nlen) != nlen) ||
608 (BIO_write(bp, "-----\n", 6) != 6))
609 goto err;
610
611 if (header != NULL && (i = strlen(header)) > 0) {
612 if ((BIO_write(bp, header, i) != i) ||
613 (BIO_write(bp, "\n", 1) != 1))
614 goto err;
615 }
616
617 buf = reallocarray(NULL, PEM_BUFSIZE, 8);
618 if (buf == NULL) {
619 reason = ERR_R_MALLOC_FAILURE;
620 goto err;
621 }
622
623 i = j = 0;
624 while (len > 0) {
625 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
626 if (!EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n))
627 goto err;
628 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
629 goto err;
630 i += outl;
631 len -= n;
632 j += n;
633 }
634 EVP_EncodeFinal(&ctx, buf, &outl);
635 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
636 goto err;
637 freezero(buf, PEM_BUFSIZE * 8);
638 buf = NULL;
639 if ((BIO_write(bp, "-----END ", 9) != 9) ||
640 (BIO_write(bp, name, nlen) != nlen) ||
641 (BIO_write(bp, "-----\n", 6) != 6))
642 goto err;
643 return (i + outl);
644
645 err:
646 freezero(buf, PEM_BUFSIZE * 8);
647 PEMerror(reason);
648 return (0);
649 }
650
651 int
PEM_read(FILE * fp,char ** name,char ** header,unsigned char ** data,long * len)652 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len)
653 {
654 BIO *b;
655 int ret;
656
657 if ((b = BIO_new(BIO_s_file())) == NULL) {
658 PEMerror(ERR_R_BUF_LIB);
659 return (0);
660 }
661 BIO_set_fp(b, fp, BIO_NOCLOSE);
662 ret = PEM_read_bio(b, name, header, data, len);
663 BIO_free(b);
664 return (ret);
665 }
666
667 int
PEM_read_bio(BIO * bp,char ** name,char ** header,unsigned char ** data,long * len)668 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
669 long *len)
670 {
671 EVP_ENCODE_CTX ctx;
672 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
673 char buf[256];
674 BUF_MEM *nameB;
675 BUF_MEM *headerB;
676 BUF_MEM *dataB, *tmpB;
677
678 nameB = BUF_MEM_new();
679 headerB = BUF_MEM_new();
680 dataB = BUF_MEM_new();
681 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
682 BUF_MEM_free(nameB);
683 BUF_MEM_free(headerB);
684 BUF_MEM_free(dataB);
685 PEMerror(ERR_R_MALLOC_FAILURE);
686 return (0);
687 }
688
689 buf[254] = '\0';
690 for (;;) {
691 i = BIO_gets(bp, buf, 254);
692
693 if (i <= 0) {
694 PEMerror(PEM_R_NO_START_LINE);
695 goto err;
696 }
697
698 while ((i >= 0) && (buf[i] <= ' '))
699 i--;
700 buf[++i] = '\n';
701 buf[++i] = '\0';
702
703 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
704 i = strlen(&(buf[11]));
705
706 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
707 continue;
708 if (!BUF_MEM_grow(nameB, i + 9)) {
709 PEMerror(ERR_R_MALLOC_FAILURE);
710 goto err;
711 }
712 memcpy(nameB->data, &(buf[11]), i - 6);
713 nameB->data[i - 6] = '\0';
714 break;
715 }
716 }
717 hl = 0;
718 if (!BUF_MEM_grow(headerB, 256)) {
719 PEMerror(ERR_R_MALLOC_FAILURE);
720 goto err;
721 }
722 headerB->data[0] = '\0';
723 for (;;) {
724 i = BIO_gets(bp, buf, 254);
725 if (i <= 0)
726 break;
727
728 while ((i >= 0) && (buf[i] <= ' '))
729 i--;
730 buf[++i] = '\n';
731 buf[++i] = '\0';
732
733 if (buf[0] == '\n')
734 break;
735 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
736 PEMerror(ERR_R_MALLOC_FAILURE);
737 goto err;
738 }
739 if (strncmp(buf, "-----END ", 9) == 0) {
740 nohead = 1;
741 break;
742 }
743 memcpy(&(headerB->data[hl]), buf, i);
744 headerB->data[hl + i] = '\0';
745 hl += i;
746 }
747
748 bl = 0;
749 if (!BUF_MEM_grow(dataB, 1024)) {
750 PEMerror(ERR_R_MALLOC_FAILURE);
751 goto err;
752 }
753 dataB->data[0] = '\0';
754 if (!nohead) {
755 for (;;) {
756 i = BIO_gets(bp, buf, 254);
757 if (i <= 0)
758 break;
759
760 while ((i >= 0) && (buf[i] <= ' '))
761 i--;
762 buf[++i] = '\n';
763 buf[++i] = '\0';
764
765 if (i != 65)
766 end = 1;
767 if (strncmp(buf, "-----END ", 9) == 0)
768 break;
769 if (i > 65)
770 break;
771 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
772 PEMerror(ERR_R_MALLOC_FAILURE);
773 goto err;
774 }
775 memcpy(&(dataB->data[bl]), buf, i);
776 dataB->data[bl + i] = '\0';
777 bl += i;
778 if (end) {
779 buf[0] = '\0';
780 i = BIO_gets(bp, buf, 254);
781 if (i <= 0)
782 break;
783
784 while ((i >= 0) && (buf[i] <= ' '))
785 i--;
786 buf[++i] = '\n';
787 buf[++i] = '\0';
788
789 break;
790 }
791 }
792 } else {
793 tmpB = headerB;
794 headerB = dataB;
795 dataB = tmpB;
796 bl = hl;
797 }
798 i = strlen(nameB->data);
799 if ((strncmp(buf, "-----END ", 9) != 0) ||
800 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
801 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
802 PEMerror(PEM_R_BAD_END_LINE);
803 goto err;
804 }
805
806 EVP_DecodeInit(&ctx);
807 i = EVP_DecodeUpdate(&ctx,
808 (unsigned char *)dataB->data, &bl,
809 (unsigned char *)dataB->data, bl);
810 if (i < 0) {
811 PEMerror(PEM_R_BAD_BASE64_DECODE);
812 goto err;
813 }
814 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
815 if (i < 0) {
816 PEMerror(PEM_R_BAD_BASE64_DECODE);
817 goto err;
818 }
819 bl += k;
820
821 if (bl == 0)
822 goto err;
823 *name = nameB->data;
824 *header = headerB->data;
825 *data = (unsigned char *)dataB->data;
826 *len = bl;
827 free(nameB);
828 free(headerB);
829 free(dataB);
830 return (1);
831
832 err:
833 BUF_MEM_free(nameB);
834 BUF_MEM_free(headerB);
835 BUF_MEM_free(dataB);
836 return (0);
837 }
838
839 /* Check pem string and return prefix length.
840 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY"
841 * the return value is 3 for the string "RSA".
842 */
843
844 int
pem_check_suffix(const char * pem_str,const char * suffix)845 pem_check_suffix(const char *pem_str, const char *suffix)
846 {
847 int pem_len = strlen(pem_str);
848 int suffix_len = strlen(suffix);
849 const char *p;
850
851 if (suffix_len + 1 >= pem_len)
852 return 0;
853 p = pem_str + pem_len - suffix_len;
854 if (strcmp(p, suffix))
855 return 0;
856 p--;
857 if (*p != ' ')
858 return 0;
859 return p - pem_str;
860 }
861