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
59 #include <stdio.h>
60 #include <ctype.h>
61 #include "cryptlib.h"
62 #include <openssl/buffer.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65 #include <openssl/rand.h>
66 #include <openssl/x509.h>
67 #include <openssl/pem.h>
68 #include <openssl/pkcs12.h>
69 #include "asn1_locl.h"
70 #ifndef OPENSSL_NO_DES
71 # include <openssl/des.h>
72 #endif
73 #ifndef OPENSSL_NO_ENGINE
74 # include <openssl/engine.h>
75 #endif
76
77 const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
78
79 #define MIN_LENGTH 4
80
81 static int load_iv(char **fromp, unsigned char *to, int num);
82 static int check_pem(const char *nm, const char *name);
83 int pem_check_suffix(const char *pem_str, const char *suffix);
84
PEM_def_callback(char * buf,int num,int w,void * key)85 int PEM_def_callback(char *buf, int num, int w, void *key)
86 {
87 #ifdef OPENSSL_NO_FP_API
88 /*
89 * We should not ever call the default callback routine from windows.
90 */
91 PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
92 return (-1);
93 #else
94 int i, j;
95 const char *prompt;
96 if (key) {
97 i = strlen(key);
98 i = (i > num) ? num : i;
99 memcpy(buf, key, i);
100 return (i);
101 }
102
103 prompt = EVP_get_pw_prompt();
104 if (prompt == NULL)
105 prompt = "Enter PEM pass phrase:";
106
107 for (;;) {
108 /*
109 * We assume that w == 0 means decryption,
110 * while w == 1 means encryption
111 */
112 int min_len = w ? MIN_LENGTH : 0;
113
114 i = EVP_read_pw_string_min(buf, min_len, num, prompt, w);
115 if (i != 0) {
116 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
117 memset(buf, 0, (unsigned int)num);
118 return (-1);
119 }
120 j = strlen(buf);
121 if (min_len && j < min_len) {
122 fprintf(stderr,
123 "phrase is too short, needs to be at least %d chars\n",
124 min_len);
125 } else
126 break;
127 }
128 return (j);
129 #endif
130 }
131
PEM_proc_type(char * buf,int type)132 void 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 BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
146 BUF_strlcat(buf, str, PEM_BUFSIZE);
147 BUF_strlcat(buf, "\n", PEM_BUFSIZE);
148 }
149
PEM_dek_info(char * buf,const char * type,int len,char * str)150 void 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 BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
157 BUF_strlcat(buf, type, PEM_BUFSIZE);
158 BUF_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
170 #ifndef OPENSSL_NO_FP_API
PEM_ASN1_read(d2i_of_void * d2i,const char * name,FILE * fp,void ** x,pem_password_cb * cb,void * u)171 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
172 pem_password_cb *cb, void *u)
173 {
174 BIO *b;
175 void *ret;
176
177 if ((b = BIO_new(BIO_s_file())) == NULL) {
178 PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
179 return (0);
180 }
181 BIO_set_fp(b, fp, BIO_NOCLOSE);
182 ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
183 BIO_free(b);
184 return (ret);
185 }
186 #endif
187
check_pem(const char * nm,const char * name)188 static int check_pem(const char *nm, const char *name)
189 {
190 /* Normal matching nm and name */
191 if (!strcmp(nm, name))
192 return 1;
193
194 /* Make PEM_STRING_EVP_PKEY match any private key */
195
196 if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
197 int slen;
198 const EVP_PKEY_ASN1_METHOD *ameth;
199 if (!strcmp(nm, PEM_STRING_PKCS8))
200 return 1;
201 if (!strcmp(nm, PEM_STRING_PKCS8INF))
202 return 1;
203 slen = pem_check_suffix(nm, "PRIVATE KEY");
204 if (slen > 0) {
205 /*
206 * NB: ENGINE implementations wont contain a deprecated old
207 * private key decode function so don't look for them.
208 */
209 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
210 if (ameth && ameth->old_priv_decode)
211 return 1;
212 }
213 return 0;
214 }
215
216 if (!strcmp(name, PEM_STRING_PARAMETERS)) {
217 int slen;
218 const EVP_PKEY_ASN1_METHOD *ameth;
219 slen = pem_check_suffix(nm, "PARAMETERS");
220 if (slen > 0) {
221 ENGINE *e;
222 ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
223 if (ameth) {
224 int r;
225 if (ameth->param_decode)
226 r = 1;
227 else
228 r = 0;
229 #ifndef OPENSSL_NO_ENGINE
230 if (e)
231 ENGINE_finish(e);
232 #endif
233 return r;
234 }
235 }
236 return 0;
237 }
238 /* If reading DH parameters handle X9.42 DH format too */
239 if (!strcmp(nm, PEM_STRING_DHXPARAMS) &&
240 !strcmp(name, PEM_STRING_DHPARAMS))
241 return 1;
242
243 /* Permit older strings */
244
245 if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
246 return 1;
247
248 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
249 !strcmp(name, PEM_STRING_X509_REQ))
250 return 1;
251
252 /* Allow normal certs to be read as trusted certs */
253 if (!strcmp(nm, PEM_STRING_X509) &&
254 !strcmp(name, PEM_STRING_X509_TRUSTED))
255 return 1;
256
257 if (!strcmp(nm, PEM_STRING_X509_OLD) &&
258 !strcmp(name, PEM_STRING_X509_TRUSTED))
259 return 1;
260
261 /* Some CAs use PKCS#7 with CERTIFICATE headers */
262 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
263 return 1;
264
265 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
266 !strcmp(name, PEM_STRING_PKCS7))
267 return 1;
268
269 #ifndef OPENSSL_NO_CMS
270 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
271 return 1;
272 /* Allow CMS to be read from PKCS#7 headers */
273 if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
274 return 1;
275 #endif
276
277 return 0;
278 }
279
PEM_bytes_read_bio(unsigned char ** pdata,long * plen,char ** pnm,const char * name,BIO * bp,pem_password_cb * cb,void * u)280 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
281 const char *name, BIO *bp, pem_password_cb *cb,
282 void *u)
283 {
284 EVP_CIPHER_INFO cipher;
285 char *nm = NULL, *header = NULL;
286 unsigned char *data = NULL;
287 long len;
288 int ret = 0;
289
290 for (;;) {
291 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
292 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
293 ERR_add_error_data(2, "Expecting: ", name);
294 return 0;
295 }
296 if (check_pem(nm, name))
297 break;
298 OPENSSL_free(nm);
299 OPENSSL_free(header);
300 OPENSSL_free(data);
301 }
302 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
303 goto err;
304 if (!PEM_do_header(&cipher, data, &len, cb, u))
305 goto err;
306
307 *pdata = data;
308 *plen = len;
309
310 if (pnm)
311 *pnm = nm;
312
313 ret = 1;
314
315 err:
316 if (!ret || !pnm)
317 OPENSSL_free(nm);
318 OPENSSL_free(header);
319 if (!ret)
320 OPENSSL_free(data);
321 return ret;
322 }
323
324 #ifndef OPENSSL_NO_FP_API
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 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
326 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
327 int klen, pem_password_cb *callback, void *u)
328 {
329 BIO *b;
330 int ret;
331
332 if ((b = BIO_new(BIO_s_file())) == NULL) {
333 PEMerr(PEM_F_PEM_ASN1_WRITE, 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 #endif
342
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)343 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
344 void *x, const EVP_CIPHER *enc, unsigned char *kstr,
345 int klen, pem_password_cb *callback, void *u)
346 {
347 EVP_CIPHER_CTX ctx;
348 int dsize = 0, i, j, ret = 0;
349 unsigned char *p, *data = NULL;
350 const char *objstr = NULL;
351 char buf[PEM_BUFSIZE];
352 unsigned char key[EVP_MAX_KEY_LENGTH];
353 unsigned char iv[EVP_MAX_IV_LENGTH];
354
355 if (enc != NULL) {
356 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
357 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
358 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
359 goto err;
360 }
361 }
362
363 if ((dsize = i2d(x, NULL)) < 0) {
364 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
365 dsize = 0;
366 goto err;
367 }
368 /* dzise + 8 bytes are needed */
369 /* actually it needs the cipher block size extra... */
370 data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
371 if (data == NULL) {
372 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
373 goto err;
374 }
375 p = data;
376 i = i2d(x, &p);
377
378 if (enc != NULL) {
379 if (kstr == NULL) {
380 if (callback == NULL)
381 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
382 else
383 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
384 if (klen <= 0) {
385 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
386 goto err;
387 }
388 #ifdef CHARSET_EBCDIC
389 /* Convert the pass phrase from EBCDIC */
390 ebcdic2ascii(buf, buf, klen);
391 #endif
392 kstr = (unsigned char *)buf;
393 }
394 RAND_add(data, i, 0); /* put in the RSA key. */
395 OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
396 if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */
397 goto err;
398 /*
399 * The 'iv' is used as the iv and as a salt. It is NOT taken from
400 * the BytesToKey function
401 */
402 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
403 goto err;
404
405 if (kstr == (unsigned char *)buf)
406 OPENSSL_cleanse(buf, PEM_BUFSIZE);
407
408 OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
409 sizeof buf);
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 OPENSSL_cleanse(key, sizeof(key));
435 OPENSSL_cleanse(iv, sizeof(iv));
436 OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
437 OPENSSL_cleanse(buf, PEM_BUFSIZE);
438 if (data != NULL) {
439 OPENSSL_cleanse(data, (unsigned int)dsize);
440 OPENSSL_free(data);
441 }
442 return (ret);
443 }
444
PEM_do_header(EVP_CIPHER_INFO * cipher,unsigned char * data,long * plen,pem_password_cb * callback,void * u)445 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
446 pem_password_cb *callback, void *u)
447 {
448 int i = 0, j, o, klen;
449 long len;
450 EVP_CIPHER_CTX ctx;
451 unsigned char key[EVP_MAX_KEY_LENGTH];
452 char buf[PEM_BUFSIZE];
453
454 len = *plen;
455
456 if (cipher->cipher == NULL)
457 return (1);
458 if (callback == NULL)
459 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
460 else
461 klen = callback(buf, PEM_BUFSIZE, 0, u);
462 if (klen <= 0) {
463 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
464 return (0);
465 }
466 #ifdef CHARSET_EBCDIC
467 /* Convert the pass phrase from EBCDIC */
468 ebcdic2ascii(buf, buf, klen);
469 #endif
470
471 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
472 (unsigned char *)buf, klen, 1, key, NULL))
473 return 0;
474
475 j = (int)len;
476 EVP_CIPHER_CTX_init(&ctx);
477 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
478 if (o)
479 o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
480 if (o)
481 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
482 EVP_CIPHER_CTX_cleanup(&ctx);
483 OPENSSL_cleanse((char *)buf, sizeof(buf));
484 OPENSSL_cleanse((char *)key, sizeof(key));
485 if (o)
486 j += i;
487 else {
488 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
489 return (0);
490 }
491 *plen = j;
492 return (1);
493 }
494
PEM_get_EVP_CIPHER_INFO(char * header,EVP_CIPHER_INFO * cipher)495 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
496 {
497 const EVP_CIPHER *enc = NULL;
498 char *p, c;
499 char **header_pp = &header;
500
501 cipher->cipher = NULL;
502 if ((header == NULL) || (*header == '\0') || (*header == '\n'))
503 return (1);
504 if (strncmp(header, "Proc-Type: ", 11) != 0) {
505 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
506 return (0);
507 }
508 header += 11;
509 if (*header != '4')
510 return (0);
511 header++;
512 if (*header != ',')
513 return (0);
514 header++;
515 if (strncmp(header, "ENCRYPTED", 9) != 0) {
516 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
517 return (0);
518 }
519 for (; (*header != '\n') && (*header != '\0'); header++) ;
520 if (*header == '\0') {
521 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
522 return (0);
523 }
524 header++;
525 if (strncmp(header, "DEK-Info: ", 10) != 0) {
526 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
527 return (0);
528 }
529 header += 10;
530
531 p = header;
532 for (;;) {
533 c = *header;
534 #ifndef CHARSET_EBCDIC
535 if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
536 ((c >= '0') && (c <= '9'))))
537 break;
538 #else
539 if (!(isupper(c) || (c == '-') || isdigit(c)))
540 break;
541 #endif
542 header++;
543 }
544 *header = '\0';
545 cipher->cipher = enc = EVP_get_cipherbyname(p);
546 *header = c;
547 header++;
548
549 if (enc == NULL) {
550 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
551 return (0);
552 }
553 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
554 return (0);
555
556 return (1);
557 }
558
load_iv(char ** fromp,unsigned char * to,int num)559 static int load_iv(char **fromp, unsigned char *to, int num)
560 {
561 int v, i;
562 char *from;
563
564 from = *fromp;
565 for (i = 0; i < num; i++)
566 to[i] = 0;
567 num *= 2;
568 for (i = 0; i < num; i++) {
569 if ((*from >= '0') && (*from <= '9'))
570 v = *from - '0';
571 else if ((*from >= 'A') && (*from <= 'F'))
572 v = *from - 'A' + 10;
573 else if ((*from >= 'a') && (*from <= 'f'))
574 v = *from - 'a' + 10;
575 else {
576 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
577 return (0);
578 }
579 from++;
580 to[i / 2] |= v << (long)((!(i & 1)) * 4);
581 }
582
583 *fromp = from;
584 return (1);
585 }
586
587 #ifndef OPENSSL_NO_FP_API
PEM_write(FILE * fp,const char * name,const char * header,const unsigned char * data,long len)588 int PEM_write(FILE *fp, const char *name, const char *header,
589 const unsigned char *data, long len)
590 {
591 BIO *b;
592 int ret;
593
594 if ((b = BIO_new(BIO_s_file())) == NULL) {
595 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
596 return (0);
597 }
598 BIO_set_fp(b, fp, BIO_NOCLOSE);
599 ret = PEM_write_bio(b, name, header, data, len);
600 BIO_free(b);
601 return (ret);
602 }
603 #endif
604
PEM_write_bio(BIO * bp,const char * name,const char * header,const unsigned char * data,long len)605 int PEM_write_bio(BIO *bp, const char *name, const char *header,
606 const unsigned char *data, long len)
607 {
608 int nlen, n, i, j, outl;
609 unsigned char *buf = NULL;
610 EVP_ENCODE_CTX ctx;
611 int reason = ERR_R_BUF_LIB;
612
613 EVP_EncodeInit(&ctx);
614 nlen = strlen(name);
615
616 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
617 (BIO_write(bp, name, nlen) != nlen) ||
618 (BIO_write(bp, "-----\n", 6) != 6))
619 goto err;
620
621 i = strlen(header);
622 if (i > 0) {
623 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
624 goto err;
625 }
626
627 buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
628 if (buf == NULL) {
629 reason = ERR_R_MALLOC_FAILURE;
630 goto err;
631 }
632
633 i = j = 0;
634 while (len > 0) {
635 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
636 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
637 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
638 goto err;
639 i += outl;
640 len -= n;
641 j += n;
642 }
643 EVP_EncodeFinal(&ctx, buf, &outl);
644 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
645 goto err;
646 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
647 OPENSSL_free(buf);
648 buf = NULL;
649 if ((BIO_write(bp, "-----END ", 9) != 9) ||
650 (BIO_write(bp, name, nlen) != nlen) ||
651 (BIO_write(bp, "-----\n", 6) != 6))
652 goto err;
653 return (i + outl);
654 err:
655 if (buf) {
656 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
657 OPENSSL_free(buf);
658 }
659 PEMerr(PEM_F_PEM_WRITE_BIO, reason);
660 return (0);
661 }
662
663 #ifndef OPENSSL_NO_FP_API
PEM_read(FILE * fp,char ** name,char ** header,unsigned char ** data,long * len)664 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
665 long *len)
666 {
667 BIO *b;
668 int ret;
669
670 if ((b = BIO_new(BIO_s_file())) == NULL) {
671 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
672 return (0);
673 }
674 BIO_set_fp(b, fp, BIO_NOCLOSE);
675 ret = PEM_read_bio(b, name, header, data, len);
676 BIO_free(b);
677 return (ret);
678 }
679 #endif
680
PEM_read_bio(BIO * bp,char ** name,char ** header,unsigned char ** data,long * len)681 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
682 long *len)
683 {
684 EVP_ENCODE_CTX ctx;
685 int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
686 char buf[256];
687 BUF_MEM *nameB;
688 BUF_MEM *headerB;
689 BUF_MEM *dataB, *tmpB;
690
691 nameB = BUF_MEM_new();
692 headerB = BUF_MEM_new();
693 dataB = BUF_MEM_new();
694 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
695 BUF_MEM_free(nameB);
696 BUF_MEM_free(headerB);
697 BUF_MEM_free(dataB);
698 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
699 return (0);
700 }
701
702 buf[254] = '\0';
703 for (;;) {
704 i = BIO_gets(bp, buf, 254);
705
706 if (i <= 0) {
707 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
708 goto err;
709 }
710
711 while ((i >= 0) && (buf[i] <= ' '))
712 i--;
713 buf[++i] = '\n';
714 buf[++i] = '\0';
715
716 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
717 i = strlen(&(buf[11]));
718
719 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
720 continue;
721 if (!BUF_MEM_grow(nameB, i + 9)) {
722 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
723 goto err;
724 }
725 memcpy(nameB->data, &(buf[11]), i - 6);
726 nameB->data[i - 6] = '\0';
727 break;
728 }
729 }
730 hl = 0;
731 if (!BUF_MEM_grow(headerB, 256)) {
732 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
733 goto err;
734 }
735 headerB->data[0] = '\0';
736 for (;;) {
737 i = BIO_gets(bp, buf, 254);
738 if (i <= 0)
739 break;
740
741 while ((i >= 0) && (buf[i] <= ' '))
742 i--;
743 buf[++i] = '\n';
744 buf[++i] = '\0';
745
746 if (buf[0] == '\n')
747 break;
748 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
749 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
750 goto err;
751 }
752 if (strncmp(buf, "-----END ", 9) == 0) {
753 nohead = 1;
754 break;
755 }
756 memcpy(&(headerB->data[hl]), buf, i);
757 headerB->data[hl + i] = '\0';
758 hl += i;
759 }
760
761 bl = 0;
762 if (!BUF_MEM_grow(dataB, 1024)) {
763 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
764 goto err;
765 }
766 dataB->data[0] = '\0';
767 if (!nohead) {
768 for (;;) {
769 i = BIO_gets(bp, buf, 254);
770 if (i <= 0)
771 break;
772
773 while ((i >= 0) && (buf[i] <= ' '))
774 i--;
775 buf[++i] = '\n';
776 buf[++i] = '\0';
777
778 if (i != 65)
779 end = 1;
780 if (strncmp(buf, "-----END ", 9) == 0)
781 break;
782 if (i > 65)
783 break;
784 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
785 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
786 goto err;
787 }
788 memcpy(&(dataB->data[bl]), buf, i);
789 dataB->data[bl + i] = '\0';
790 bl += i;
791 if (end) {
792 buf[0] = '\0';
793 i = BIO_gets(bp, buf, 254);
794 if (i <= 0)
795 break;
796
797 while ((i >= 0) && (buf[i] <= ' '))
798 i--;
799 buf[++i] = '\n';
800 buf[++i] = '\0';
801
802 break;
803 }
804 }
805 } else {
806 tmpB = headerB;
807 headerB = dataB;
808 dataB = tmpB;
809 bl = hl;
810 }
811 i = strlen(nameB->data);
812 if ((strncmp(buf, "-----END ", 9) != 0) ||
813 (strncmp(nameB->data, &(buf[9]), i) != 0) ||
814 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
815 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
816 goto err;
817 }
818
819 EVP_DecodeInit(&ctx);
820 i = EVP_DecodeUpdate(&ctx,
821 (unsigned char *)dataB->data, &bl,
822 (unsigned char *)dataB->data, bl);
823 if (i < 0) {
824 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
825 goto err;
826 }
827 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
828 if (i < 0) {
829 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
830 goto err;
831 }
832 bl += k;
833
834 if (bl == 0)
835 goto err;
836 *name = nameB->data;
837 *header = headerB->data;
838 *data = (unsigned char *)dataB->data;
839 *len = bl;
840 OPENSSL_free(nameB);
841 OPENSSL_free(headerB);
842 OPENSSL_free(dataB);
843 return (1);
844 err:
845 BUF_MEM_free(nameB);
846 BUF_MEM_free(headerB);
847 BUF_MEM_free(dataB);
848 return (0);
849 }
850
851 /*
852 * Check pem string and return prefix length. If for example the pem_str ==
853 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
854 * string "RSA".
855 */
856
pem_check_suffix(const char * pem_str,const char * suffix)857 int pem_check_suffix(const char *pem_str, const char *suffix)
858 {
859 int pem_len = strlen(pem_str);
860 int suffix_len = strlen(suffix);
861 const char *p;
862 if (suffix_len + 1 >= pem_len)
863 return 0;
864 p = pem_str + pem_len - suffix_len;
865 if (strcmp(p, suffix))
866 return 0;
867 p--;
868 if (*p != ' ')
869 return 0;
870 return p - pem_str;
871 }
872