1 /* $OpenBSD: pem_lib.c,v 1.45 2017/05/02 03:59:44 deraadt 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 PEMerror(PEM_R_PROBLEMS_GETTING_PASSWORD); 116 memset(buf, 0, num); 117 return (-1); 118 } 119 l = strlen(buf); 120 if (l < MIN_LENGTH) { 121 fprintf(stderr, "phrase is too short, " 122 "needs to be at least %zu chars\n", 123 (size_t)MIN_LENGTH); 124 } else 125 break; 126 } 127 return (int)l; 128 } 129 130 void 131 PEM_proc_type(char *buf, int type) 132 { 133 const char *str; 134 135 if (type == PEM_TYPE_ENCRYPTED) 136 str = "ENCRYPTED"; 137 else if (type == PEM_TYPE_MIC_CLEAR) 138 str = "MIC-CLEAR"; 139 else if (type == PEM_TYPE_MIC_ONLY) 140 str = "MIC-ONLY"; 141 else 142 str = "BAD-TYPE"; 143 144 strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE); 145 strlcat(buf, str, PEM_BUFSIZE); 146 strlcat(buf, "\n", PEM_BUFSIZE); 147 } 148 149 void 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 } 169 170 void * 171 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 PEMerror(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 } 186 187 static int 188 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 /* NB: ENGINE implementations wont contain 206 * a deprecated old private key decode function 207 * 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 } 238 239 /* 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; 266 267 268 return 0; 269 } 270 271 int 272 PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, 273 const char *name, BIO *bp, pem_password_cb *cb, void *u) 274 { 275 EVP_CIPHER_INFO cipher; 276 char *nm = NULL, *header = NULL; 277 unsigned char *data = NULL; 278 long len; 279 int ret = 0; 280 281 for (;;) { 282 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) { 283 if (ERR_GET_REASON(ERR_peek_error()) == 284 PEM_R_NO_START_LINE) 285 ERR_asprintf_error_data("Expecting: %s", name); 286 return 0; 287 } 288 if (check_pem(nm, name)) 289 break; 290 free(nm); 291 free(header); 292 free(data); 293 } 294 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) 295 goto err; 296 if (!PEM_do_header(&cipher, data, &len, cb, u)) 297 goto err; 298 299 *pdata = data; 300 *plen = len; 301 302 if (pnm) 303 *pnm = nm; 304 305 ret = 1; 306 307 err: 308 if (!ret || !pnm) 309 free(nm); 310 free(header); 311 if (!ret) 312 free(data); 313 return ret; 314 } 315 316 int 317 PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x, 318 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 319 pem_password_cb *callback, void *u) 320 { 321 BIO *b; 322 int ret; 323 324 if ((b = BIO_new(BIO_s_file())) == NULL) { 325 PEMerror(ERR_R_BUF_LIB); 326 return (0); 327 } 328 BIO_set_fp(b, fp, BIO_NOCLOSE); 329 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u); 330 BIO_free(b); 331 return (ret); 332 } 333 334 int 335 PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x, 336 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 337 pem_password_cb *callback, void *u) 338 { 339 EVP_CIPHER_CTX ctx; 340 int dsize = 0, i, j, ret = 0; 341 unsigned char *p, *data = NULL; 342 const char *objstr = NULL; 343 char buf[PEM_BUFSIZE]; 344 unsigned char key[EVP_MAX_KEY_LENGTH]; 345 unsigned char iv[EVP_MAX_IV_LENGTH]; 346 347 if (enc != NULL) { 348 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); 349 if (objstr == NULL) { 350 PEMerror(PEM_R_UNSUPPORTED_CIPHER); 351 goto err; 352 } 353 } 354 355 if ((dsize = i2d(x, NULL)) < 0) { 356 PEMerror(ERR_R_ASN1_LIB); 357 dsize = 0; 358 goto err; 359 } 360 /* dzise + 8 bytes are needed */ 361 /* actually it needs the cipher block size extra... */ 362 data = malloc(dsize + 20); 363 if (data == NULL) { 364 PEMerror(ERR_R_MALLOC_FAILURE); 365 goto err; 366 } 367 p = data; 368 i = i2d(x, &p); 369 370 if (enc != NULL) { 371 if (kstr == NULL) { 372 if (callback == NULL) 373 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); 374 else 375 klen = (*callback)(buf, PEM_BUFSIZE, 1, u); 376 if (klen <= 0) { 377 PEMerror(PEM_R_READ_KEY); 378 goto err; 379 } 380 kstr = (unsigned char *)buf; 381 } 382 if ((size_t)enc->iv_len > sizeof(iv)) { 383 PEMerror(EVP_R_IV_TOO_LARGE); 384 goto err; 385 } 386 arc4random_buf(iv, enc->iv_len); /* Generate a salt */ 387 /* The 'iv' is used as the iv and as a salt. It is 388 * NOT taken from the BytesToKey function */ 389 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, 390 key, NULL)) 391 goto err; 392 393 if (kstr == (unsigned char *)buf) 394 explicit_bzero(buf, PEM_BUFSIZE); 395 396 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) { 397 PEMerror(ASN1_R_BUFFER_TOO_SMALL); 398 goto err; 399 } 400 401 buf[0] = '\0'; 402 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); 403 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv); 404 /* k=strlen(buf); */ 405 406 EVP_CIPHER_CTX_init(&ctx); 407 ret = 1; 408 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) || 409 !EVP_EncryptUpdate(&ctx, data, &j, data, i) || 410 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i)) 411 ret = 0; 412 EVP_CIPHER_CTX_cleanup(&ctx); 413 if (ret == 0) 414 goto err; 415 i += j; 416 } else { 417 ret = 1; 418 buf[0] = '\0'; 419 } 420 i = PEM_write_bio(bp, name, buf, data, i); 421 if (i <= 0) 422 ret = 0; 423 err: 424 explicit_bzero(key, sizeof(key)); 425 explicit_bzero(iv, sizeof(iv)); 426 explicit_bzero((char *)&ctx, sizeof(ctx)); 427 explicit_bzero(buf, PEM_BUFSIZE); 428 freezero(data, (unsigned int)dsize); 429 return (ret); 430 } 431 432 int 433 PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, 434 pem_password_cb *callback, void *u) 435 { 436 int i, j, o, klen; 437 long len; 438 EVP_CIPHER_CTX ctx; 439 unsigned char key[EVP_MAX_KEY_LENGTH]; 440 char buf[PEM_BUFSIZE]; 441 442 len = *plen; 443 444 if (cipher->cipher == NULL) 445 return (1); 446 if (callback == NULL) 447 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); 448 else 449 klen = callback(buf, PEM_BUFSIZE, 0, u); 450 if (klen <= 0) { 451 PEMerror(PEM_R_BAD_PASSWORD_READ); 452 return (0); 453 } 454 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), 455 (unsigned char *)buf, klen, 1, key, NULL)) 456 return 0; 457 458 j = (int)len; 459 EVP_CIPHER_CTX_init(&ctx); 460 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, 461 &(cipher->iv[0])); 462 if (o) 463 o = EVP_DecryptUpdate(&ctx, data, &i, data, j); 464 if (o) 465 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j); 466 EVP_CIPHER_CTX_cleanup(&ctx); 467 explicit_bzero((char *)buf, sizeof(buf)); 468 explicit_bzero((char *)key, sizeof(key)); 469 if (!o) { 470 PEMerror(PEM_R_BAD_DECRYPT); 471 return (0); 472 } 473 *plen = j + i; 474 return (1); 475 } 476 477 int 478 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 479 { 480 const EVP_CIPHER *enc = NULL; 481 char *p, c; 482 char **header_pp = &header; 483 484 cipher->cipher = NULL; 485 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 486 return (1); 487 if (strncmp(header, "Proc-Type: ", 11) != 0) { 488 PEMerror(PEM_R_NOT_PROC_TYPE); 489 return (0); 490 } 491 header += 11; 492 if (*header != '4') 493 return (0); 494 header++; 495 if (*header != ',') 496 return (0); 497 header++; 498 if (strncmp(header, "ENCRYPTED", 9) != 0) { 499 PEMerror(PEM_R_NOT_ENCRYPTED); 500 return (0); 501 } 502 for (; (*header != '\n') && (*header != '\0'); header++) 503 ; 504 if (*header == '\0') { 505 PEMerror(PEM_R_SHORT_HEADER); 506 return (0); 507 } 508 header++; 509 if (strncmp(header, "DEK-Info: ", 10) != 0) { 510 PEMerror(PEM_R_NOT_DEK_INFO); 511 return (0); 512 } 513 header += 10; 514 515 p = header; 516 for (;;) { 517 c= *header; 518 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') || 519 ((c >= '0') && (c <= '9')))) 520 break; 521 header++; 522 } 523 *header = '\0'; 524 cipher->cipher = enc = EVP_get_cipherbyname(p); 525 *header = c; 526 header++; 527 528 if (enc == NULL) { 529 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION); 530 return (0); 531 } 532 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len)) 533 return (0); 534 535 return (1); 536 } 537 538 static int 539 load_iv(char **fromp, unsigned char *to, int num) 540 { 541 int v, i; 542 char *from; 543 544 from= *fromp; 545 for (i = 0; i < num; i++) 546 to[i] = 0; 547 num *= 2; 548 for (i = 0; i < num; i++) { 549 if ((*from >= '0') && (*from <= '9')) 550 v = *from - '0'; 551 else if ((*from >= 'A') && (*from <= 'F')) 552 v = *from - 'A' + 10; 553 else if ((*from >= 'a') && (*from <= 'f')) 554 v = *from - 'a' + 10; 555 else { 556 PEMerror(PEM_R_BAD_IV_CHARS); 557 return (0); 558 } 559 from++; 560 to[i / 2] |= v << (long)((!(i & 1)) * 4); 561 } 562 563 *fromp = from; 564 return (1); 565 } 566 567 int 568 PEM_write(FILE *fp, char *name, char *header, unsigned char *data, long len) 569 { 570 BIO *b; 571 int ret; 572 573 if ((b = BIO_new(BIO_s_file())) == NULL) { 574 PEMerror(ERR_R_BUF_LIB); 575 return (0); 576 } 577 BIO_set_fp(b, fp, BIO_NOCLOSE); 578 ret = PEM_write_bio(b, name, header, data, len); 579 BIO_free(b); 580 return (ret); 581 } 582 583 int 584 PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data, 585 long len) 586 { 587 int nlen, n, i, j, outl; 588 unsigned char *buf = NULL; 589 EVP_ENCODE_CTX ctx; 590 int reason = ERR_R_BUF_LIB; 591 592 EVP_EncodeInit(&ctx); 593 nlen = strlen(name); 594 595 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || 596 (BIO_write(bp, name, nlen) != nlen) || 597 (BIO_write(bp, "-----\n", 6) != 6)) 598 goto err; 599 600 i = strlen(header); 601 if (i > 0) { 602 if ((BIO_write(bp, header, i) != i) || 603 (BIO_write(bp, "\n", 1) != 1)) 604 goto err; 605 } 606 607 buf = reallocarray(NULL, PEM_BUFSIZE, 8); 608 if (buf == NULL) { 609 reason = ERR_R_MALLOC_FAILURE; 610 goto err; 611 } 612 613 i = j = 0; 614 while (len > 0) { 615 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); 616 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n); 617 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) 618 goto err; 619 i += outl; 620 len -= n; 621 j += n; 622 } 623 EVP_EncodeFinal(&ctx, buf, &outl); 624 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) 625 goto err; 626 freezero(buf, PEM_BUFSIZE * 8); 627 buf = NULL; 628 if ((BIO_write(bp, "-----END ", 9) != 9) || 629 (BIO_write(bp, name, nlen) != nlen) || 630 (BIO_write(bp, "-----\n", 6) != 6)) 631 goto err; 632 return (i + outl); 633 634 err: 635 freezero(buf, PEM_BUFSIZE * 8); 636 PEMerror(reason); 637 return (0); 638 } 639 640 int 641 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len) 642 { 643 BIO *b; 644 int ret; 645 646 if ((b = BIO_new(BIO_s_file())) == NULL) { 647 PEMerror(ERR_R_BUF_LIB); 648 return (0); 649 } 650 BIO_set_fp(b, fp, BIO_NOCLOSE); 651 ret = PEM_read_bio(b, name, header, data, len); 652 BIO_free(b); 653 return (ret); 654 } 655 656 int 657 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 658 long *len) 659 { 660 EVP_ENCODE_CTX ctx; 661 int end = 0, i, k, bl = 0, hl = 0, nohead = 0; 662 char buf[256]; 663 BUF_MEM *nameB; 664 BUF_MEM *headerB; 665 BUF_MEM *dataB, *tmpB; 666 667 nameB = BUF_MEM_new(); 668 headerB = BUF_MEM_new(); 669 dataB = BUF_MEM_new(); 670 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { 671 BUF_MEM_free(nameB); 672 BUF_MEM_free(headerB); 673 BUF_MEM_free(dataB); 674 PEMerror(ERR_R_MALLOC_FAILURE); 675 return (0); 676 } 677 678 buf[254] = '\0'; 679 for (;;) { 680 i = BIO_gets(bp, buf, 254); 681 682 if (i <= 0) { 683 PEMerror(PEM_R_NO_START_LINE); 684 goto err; 685 } 686 687 while ((i >= 0) && (buf[i] <= ' ')) 688 i--; 689 buf[++i] = '\n'; 690 buf[++i] = '\0'; 691 692 if (strncmp(buf, "-----BEGIN ", 11) == 0) { 693 i = strlen(&(buf[11])); 694 695 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) 696 continue; 697 if (!BUF_MEM_grow(nameB, i + 9)) { 698 PEMerror(ERR_R_MALLOC_FAILURE); 699 goto err; 700 } 701 memcpy(nameB->data, &(buf[11]), i - 6); 702 nameB->data[i - 6] = '\0'; 703 break; 704 } 705 } 706 hl = 0; 707 if (!BUF_MEM_grow(headerB, 256)) { 708 PEMerror(ERR_R_MALLOC_FAILURE); 709 goto err; 710 } 711 headerB->data[0] = '\0'; 712 for (;;) { 713 i = BIO_gets(bp, buf, 254); 714 if (i <= 0) 715 break; 716 717 while ((i >= 0) && (buf[i] <= ' ')) 718 i--; 719 buf[++i] = '\n'; 720 buf[++i] = '\0'; 721 722 if (buf[0] == '\n') 723 break; 724 if (!BUF_MEM_grow(headerB, hl + i + 9)) { 725 PEMerror(ERR_R_MALLOC_FAILURE); 726 goto err; 727 } 728 if (strncmp(buf, "-----END ", 9) == 0) { 729 nohead = 1; 730 break; 731 } 732 memcpy(&(headerB->data[hl]), buf, i); 733 headerB->data[hl + i] = '\0'; 734 hl += i; 735 } 736 737 bl = 0; 738 if (!BUF_MEM_grow(dataB, 1024)) { 739 PEMerror(ERR_R_MALLOC_FAILURE); 740 goto err; 741 } 742 dataB->data[0] = '\0'; 743 if (!nohead) { 744 for (;;) { 745 i = BIO_gets(bp, buf, 254); 746 if (i <= 0) 747 break; 748 749 while ((i >= 0) && (buf[i] <= ' ')) 750 i--; 751 buf[++i] = '\n'; 752 buf[++i] = '\0'; 753 754 if (i != 65) 755 end = 1; 756 if (strncmp(buf, "-----END ", 9) == 0) 757 break; 758 if (i > 65) 759 break; 760 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { 761 PEMerror(ERR_R_MALLOC_FAILURE); 762 goto err; 763 } 764 memcpy(&(dataB->data[bl]), buf, i); 765 dataB->data[bl + i] = '\0'; 766 bl += i; 767 if (end) { 768 buf[0] = '\0'; 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 break; 779 } 780 } 781 } else { 782 tmpB = headerB; 783 headerB = dataB; 784 dataB = tmpB; 785 bl = hl; 786 } 787 i = strlen(nameB->data); 788 if ((strncmp(buf, "-----END ", 9) != 0) || 789 (strncmp(nameB->data, &(buf[9]), i) != 0) || 790 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { 791 PEMerror(PEM_R_BAD_END_LINE); 792 goto err; 793 } 794 795 EVP_DecodeInit(&ctx); 796 i = EVP_DecodeUpdate(&ctx, 797 (unsigned char *)dataB->data, &bl, 798 (unsigned char *)dataB->data, bl); 799 if (i < 0) { 800 PEMerror(PEM_R_BAD_BASE64_DECODE); 801 goto err; 802 } 803 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k); 804 if (i < 0) { 805 PEMerror(PEM_R_BAD_BASE64_DECODE); 806 goto err; 807 } 808 bl += k; 809 810 if (bl == 0) 811 goto err; 812 *name = nameB->data; 813 *header = headerB->data; 814 *data = (unsigned char *)dataB->data; 815 *len = bl; 816 free(nameB); 817 free(headerB); 818 free(dataB); 819 return (1); 820 821 err: 822 BUF_MEM_free(nameB); 823 BUF_MEM_free(headerB); 824 BUF_MEM_free(dataB); 825 return (0); 826 } 827 828 /* Check pem string and return prefix length. 829 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" 830 * the return value is 3 for the string "RSA". 831 */ 832 833 int 834 pem_check_suffix(const char *pem_str, const char *suffix) 835 { 836 int pem_len = strlen(pem_str); 837 int suffix_len = strlen(suffix); 838 const char *p; 839 840 if (suffix_len + 1 >= pem_len) 841 return 0; 842 p = pem_str + pem_len - suffix_len; 843 if (strcmp(p, suffix)) 844 return 0; 845 p--; 846 if (*p != ' ') 847 return 0; 848 return p - pem_str; 849 } 850