1 /* $OpenBSD: pem_lib.c,v 1.41 2015/07/19 18:29:31 miod 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 83 #define MIN_LENGTH 4 84 85 static int load_iv(char **fromp, unsigned char *to, int num); 86 static int check_pem(const char *nm, const char *name); 87 int pem_check_suffix(const char *pem_str, const char *suffix); 88 89 /* XXX LSSL ABI XXX return value and `num' ought to be size_t */ 90 int 91 PEM_def_callback(char *buf, int num, int w, void *key) 92 { 93 size_t l; 94 int i; 95 const char *prompt; 96 97 if (num < 0) 98 return -1; 99 100 if (key) { 101 l = strlen(key); 102 if (l > (size_t)num) 103 l = (size_t)num; 104 memcpy(buf, key, l); 105 return (int)l; 106 } 107 108 prompt = EVP_get_pw_prompt(); 109 if (prompt == NULL) 110 prompt = "Enter PEM pass phrase:"; 111 112 for (;;) { 113 i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w); 114 if (i != 0) { 115 PEMerr(PEM_F_PEM_DEF_CALLBACK, 116 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 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 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 * 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 PEMerr(PEM_F_PEM_ASN1_READ, 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 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 if (e) 232 ENGINE_finish(e); 233 #endif 234 return r; 235 } 236 } 237 return 0; 238 } 239 240 /* Permit older strings */ 241 242 if (!strcmp(nm, PEM_STRING_X509_OLD) && 243 !strcmp(name, PEM_STRING_X509)) 244 return 1; 245 246 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) && 247 !strcmp(name, PEM_STRING_X509_REQ)) 248 return 1; 249 250 /* Allow normal certs to be read as trusted certs */ 251 if (!strcmp(nm, PEM_STRING_X509) && 252 !strcmp(name, PEM_STRING_X509_TRUSTED)) 253 return 1; 254 255 if (!strcmp(nm, PEM_STRING_X509_OLD) && 256 !strcmp(name, PEM_STRING_X509_TRUSTED)) 257 return 1; 258 259 /* Some CAs use PKCS#7 with CERTIFICATE headers */ 260 if (!strcmp(nm, PEM_STRING_X509) && 261 !strcmp(name, PEM_STRING_PKCS7)) 262 return 1; 263 264 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && 265 !strcmp(name, PEM_STRING_PKCS7)) 266 return 1; 267 268 #ifndef OPENSSL_NO_CMS 269 if (!strcmp(nm, PEM_STRING_X509) && 270 !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) && 274 !strcmp(name, PEM_STRING_CMS)) 275 return 1; 276 #endif 277 278 return 0; 279 } 280 281 int 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 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 PEMerr(PEM_F_PEM_ASN1_WRITE, 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 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 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, 361 PEM_R_UNSUPPORTED_CIPHER); 362 goto err; 363 } 364 } 365 366 if ((dsize = i2d(x, NULL)) < 0) { 367 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB); 368 dsize = 0; 369 goto err; 370 } 371 /* dzise + 8 bytes are needed */ 372 /* actually it needs the cipher block size extra... */ 373 data = malloc(dsize + 20); 374 if (data == NULL) { 375 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE); 376 goto err; 377 } 378 p = data; 379 i = i2d(x, &p); 380 381 if (enc != NULL) { 382 if (kstr == NULL) { 383 if (callback == NULL) 384 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); 385 else 386 klen = (*callback)(buf, PEM_BUFSIZE, 1, u); 387 if (klen <= 0) { 388 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, 389 PEM_R_READ_KEY); 390 goto err; 391 } 392 kstr = (unsigned char *)buf; 393 } 394 if ((size_t)enc->iv_len > sizeof(iv)) { 395 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, EVP_R_IV_TOO_LARGE); 396 goto err; 397 } 398 arc4random_buf(iv, enc->iv_len); /* Generate a salt */ 399 /* The 'iv' is used as the iv and as a salt. It is 400 * NOT taken from the BytesToKey function */ 401 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, 402 key, NULL)) 403 goto err; 404 405 if (kstr == (unsigned char *)buf) 406 explicit_bzero(buf, PEM_BUFSIZE); 407 408 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) { 409 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, 410 ASN1_R_BUFFER_TOO_SMALL); 411 goto err; 412 } 413 414 buf[0] = '\0'; 415 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); 416 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv); 417 /* k=strlen(buf); */ 418 419 EVP_CIPHER_CTX_init(&ctx); 420 ret = 1; 421 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) || 422 !EVP_EncryptUpdate(&ctx, data, &j, data, i) || 423 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i)) 424 ret = 0; 425 EVP_CIPHER_CTX_cleanup(&ctx); 426 if (ret == 0) 427 goto err; 428 i += j; 429 } else { 430 ret = 1; 431 buf[0] = '\0'; 432 } 433 i = PEM_write_bio(bp, name, buf, data, i); 434 if (i <= 0) 435 ret = 0; 436 err: 437 explicit_bzero(key, sizeof(key)); 438 explicit_bzero(iv, sizeof(iv)); 439 explicit_bzero((char *)&ctx, sizeof(ctx)); 440 explicit_bzero(buf, PEM_BUFSIZE); 441 if (data != NULL) { 442 explicit_bzero(data, (unsigned int)dsize); 443 free(data); 444 } 445 return (ret); 446 } 447 448 int 449 PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, 450 pem_password_cb *callback, void *u) 451 { 452 int i, j, o, klen; 453 long len; 454 EVP_CIPHER_CTX ctx; 455 unsigned char key[EVP_MAX_KEY_LENGTH]; 456 char buf[PEM_BUFSIZE]; 457 458 len = *plen; 459 460 if (cipher->cipher == NULL) 461 return (1); 462 if (callback == NULL) 463 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); 464 else 465 klen = callback(buf, PEM_BUFSIZE, 0, u); 466 if (klen <= 0) { 467 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ); 468 return (0); 469 } 470 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), 471 (unsigned char *)buf, klen, 1, key, NULL)) 472 return 0; 473 474 j = (int)len; 475 EVP_CIPHER_CTX_init(&ctx); 476 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, 477 &(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 explicit_bzero((char *)buf, sizeof(buf)); 484 explicit_bzero((char *)key, sizeof(key)); 485 if (!o) { 486 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT); 487 return (0); 488 } 489 *plen = j + i; 490 return (1); 491 } 492 493 int 494 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 495 { 496 const EVP_CIPHER *enc = NULL; 497 char *p, c; 498 char **header_pp = &header; 499 500 cipher->cipher = NULL; 501 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 502 return (1); 503 if (strncmp(header, "Proc-Type: ", 11) != 0) { 504 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE); 505 return (0); 506 } 507 header += 11; 508 if (*header != '4') 509 return (0); 510 header++; 511 if (*header != ',') 512 return (0); 513 header++; 514 if (strncmp(header, "ENCRYPTED", 9) != 0) { 515 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED); 516 return (0); 517 } 518 for (; (*header != '\n') && (*header != '\0'); header++) 519 ; 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 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') || 535 ((c >= '0') && (c <= '9')))) 536 break; 537 header++; 538 } 539 *header = '\0'; 540 cipher->cipher = enc = EVP_get_cipherbyname(p); 541 *header = c; 542 header++; 543 544 if (enc == NULL) { 545 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, 546 PEM_R_UNSUPPORTED_ENCRYPTION); 547 return (0); 548 } 549 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len)) 550 return (0); 551 552 return (1); 553 } 554 555 static int 556 load_iv(char **fromp, unsigned char *to, int num) 557 { 558 int v, i; 559 char *from; 560 561 from= *fromp; 562 for (i = 0; i < num; i++) 563 to[i] = 0; 564 num *= 2; 565 for (i = 0; i < num; i++) { 566 if ((*from >= '0') && (*from <= '9')) 567 v = *from - '0'; 568 else if ((*from >= 'A') && (*from <= 'F')) 569 v = *from - 'A' + 10; 570 else if ((*from >= 'a') && (*from <= 'f')) 571 v = *from - 'a' + 10; 572 else { 573 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS); 574 return (0); 575 } 576 from++; 577 to[i / 2] |= v << (long)((!(i & 1)) * 4); 578 } 579 580 *fromp = from; 581 return (1); 582 } 583 584 int 585 PEM_write(FILE *fp, char *name, char *header, unsigned char *data, long len) 586 { 587 BIO *b; 588 int ret; 589 590 if ((b = BIO_new(BIO_s_file())) == NULL) { 591 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB); 592 return (0); 593 } 594 BIO_set_fp(b, fp, BIO_NOCLOSE); 595 ret = PEM_write_bio(b, name, header, data, len); 596 BIO_free(b); 597 return (ret); 598 } 599 600 int 601 PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data, 602 long len) 603 { 604 int nlen, n, i, j, outl; 605 unsigned char *buf = NULL; 606 EVP_ENCODE_CTX ctx; 607 int reason = ERR_R_BUF_LIB; 608 609 EVP_EncodeInit(&ctx); 610 nlen = strlen(name); 611 612 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || 613 (BIO_write(bp, name, nlen) != nlen) || 614 (BIO_write(bp, "-----\n", 6) != 6)) 615 goto err; 616 617 i = strlen(header); 618 if (i > 0) { 619 if ((BIO_write(bp, header, i) != i) || 620 (BIO_write(bp, "\n", 1) != 1)) 621 goto err; 622 } 623 624 buf = reallocarray(NULL, PEM_BUFSIZE, 8); 625 if (buf == NULL) { 626 reason = ERR_R_MALLOC_FAILURE; 627 goto err; 628 } 629 630 i = j = 0; 631 while (len > 0) { 632 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); 633 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n); 634 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) 635 goto err; 636 i += outl; 637 len -= n; 638 j += n; 639 } 640 EVP_EncodeFinal(&ctx, buf, &outl); 641 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) 642 goto err; 643 explicit_bzero(buf, PEM_BUFSIZE * 8); 644 free(buf); 645 buf = NULL; 646 if ((BIO_write(bp, "-----END ", 9) != 9) || 647 (BIO_write(bp, name, nlen) != nlen) || 648 (BIO_write(bp, "-----\n", 6) != 6)) 649 goto err; 650 return (i + outl); 651 652 err: 653 if (buf) { 654 explicit_bzero(buf, PEM_BUFSIZE * 8); 655 free(buf); 656 } 657 PEMerr(PEM_F_PEM_WRITE_BIO, reason); 658 return (0); 659 } 660 661 int 662 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len) 663 { 664 BIO *b; 665 int ret; 666 667 if ((b = BIO_new(BIO_s_file())) == NULL) { 668 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB); 669 return (0); 670 } 671 BIO_set_fp(b, fp, BIO_NOCLOSE); 672 ret = PEM_read_bio(b, name, header, data, len); 673 BIO_free(b); 674 return (ret); 675 } 676 677 int 678 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 679 long *len) 680 { 681 EVP_ENCODE_CTX ctx; 682 int end = 0, i, k, bl = 0, hl = 0, nohead = 0; 683 char buf[256]; 684 BUF_MEM *nameB; 685 BUF_MEM *headerB; 686 BUF_MEM *dataB, *tmpB; 687 688 nameB = BUF_MEM_new(); 689 headerB = BUF_MEM_new(); 690 dataB = BUF_MEM_new(); 691 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { 692 BUF_MEM_free(nameB); 693 BUF_MEM_free(headerB); 694 BUF_MEM_free(dataB); 695 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 696 return (0); 697 } 698 699 buf[254] = '\0'; 700 for (;;) { 701 i = BIO_gets(bp, buf, 254); 702 703 if (i <= 0) { 704 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE); 705 goto err; 706 } 707 708 while ((i >= 0) && (buf[i] <= ' ')) 709 i--; 710 buf[++i] = '\n'; 711 buf[++i] = '\0'; 712 713 if (strncmp(buf, "-----BEGIN ", 11) == 0) { 714 i = strlen(&(buf[11])); 715 716 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) 717 continue; 718 if (!BUF_MEM_grow(nameB, i + 9)) { 719 PEMerr(PEM_F_PEM_READ_BIO, 720 ERR_R_MALLOC_FAILURE); 721 goto err; 722 } 723 memcpy(nameB->data, &(buf[11]), i - 6); 724 nameB->data[i - 6] = '\0'; 725 break; 726 } 727 } 728 hl = 0; 729 if (!BUF_MEM_grow(headerB, 256)) { 730 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 731 goto err; 732 } 733 headerB->data[0] = '\0'; 734 for (;;) { 735 i = BIO_gets(bp, buf, 254); 736 if (i <= 0) 737 break; 738 739 while ((i >= 0) && (buf[i] <= ' ')) 740 i--; 741 buf[++i] = '\n'; 742 buf[++i] = '\0'; 743 744 if (buf[0] == '\n') 745 break; 746 if (!BUF_MEM_grow(headerB, hl + i + 9)) { 747 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 748 goto err; 749 } 750 if (strncmp(buf, "-----END ", 9) == 0) { 751 nohead = 1; 752 break; 753 } 754 memcpy(&(headerB->data[hl]), buf, i); 755 headerB->data[hl + i] = '\0'; 756 hl += i; 757 } 758 759 bl = 0; 760 if (!BUF_MEM_grow(dataB, 1024)) { 761 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 762 goto err; 763 } 764 dataB->data[0] = '\0'; 765 if (!nohead) { 766 for (;;) { 767 i = BIO_gets(bp, buf, 254); 768 if (i <= 0) 769 break; 770 771 while ((i >= 0) && (buf[i] <= ' ')) 772 i--; 773 buf[++i] = '\n'; 774 buf[++i] = '\0'; 775 776 if (i != 65) 777 end = 1; 778 if (strncmp(buf, "-----END ", 9) == 0) 779 break; 780 if (i > 65) 781 break; 782 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { 783 PEMerr(PEM_F_PEM_READ_BIO, 784 ERR_R_MALLOC_FAILURE); 785 goto err; 786 } 787 memcpy(&(dataB->data[bl]), buf, i); 788 dataB->data[bl + i] = '\0'; 789 bl += i; 790 if (end) { 791 buf[0] = '\0'; 792 i = BIO_gets(bp, buf, 254); 793 if (i <= 0) 794 break; 795 796 while ((i >= 0) && (buf[i] <= ' ')) 797 i--; 798 buf[++i] = '\n'; 799 buf[++i] = '\0'; 800 801 break; 802 } 803 } 804 } else { 805 tmpB = headerB; 806 headerB = dataB; 807 dataB = tmpB; 808 bl = hl; 809 } 810 i = strlen(nameB->data); 811 if ((strncmp(buf, "-----END ", 9) != 0) || 812 (strncmp(nameB->data, &(buf[9]), i) != 0) || 813 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { 814 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE); 815 goto err; 816 } 817 818 EVP_DecodeInit(&ctx); 819 i = EVP_DecodeUpdate(&ctx, 820 (unsigned char *)dataB->data, &bl, 821 (unsigned char *)dataB->data, bl); 822 if (i < 0) { 823 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); 824 goto err; 825 } 826 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k); 827 if (i < 0) { 828 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); 829 goto err; 830 } 831 bl += k; 832 833 if (bl == 0) 834 goto err; 835 *name = nameB->data; 836 *header = headerB->data; 837 *data = (unsigned char *)dataB->data; 838 *len = bl; 839 free(nameB); 840 free(headerB); 841 free(dataB); 842 return (1); 843 844 err: 845 BUF_MEM_free(nameB); 846 BUF_MEM_free(headerB); 847 BUF_MEM_free(dataB); 848 return (0); 849 } 850 851 /* Check pem string and return prefix length. 852 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" 853 * the return value is 3 for the string "RSA". 854 */ 855 856 int 857 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; 862 863 if (suffix_len + 1 >= pem_len) 864 return 0; 865 p = pem_str + pem_len - suffix_len; 866 if (strcmp(p, suffix)) 867 return 0; 868 p--; 869 if (*p != ' ') 870 return 0; 871 return p - pem_str; 872 } 873