1 /* $OpenBSD: pem_lib.c,v 1.48 2018/08/24 19:48:39 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 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 ENGINE_finish(e); 231 #endif 232 return r; 233 } 234 } 235 return 0; 236 } 237 238 /* Permit older strings */ 239 240 if (!strcmp(nm, PEM_STRING_X509_OLD) && 241 !strcmp(name, PEM_STRING_X509)) 242 return 1; 243 244 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) && 245 !strcmp(name, PEM_STRING_X509_REQ)) 246 return 1; 247 248 /* Allow normal certs to be read as trusted certs */ 249 if (!strcmp(nm, PEM_STRING_X509) && 250 !strcmp(name, PEM_STRING_X509_TRUSTED)) 251 return 1; 252 253 if (!strcmp(nm, PEM_STRING_X509_OLD) && 254 !strcmp(name, PEM_STRING_X509_TRUSTED)) 255 return 1; 256 257 /* Some CAs use PKCS#7 with CERTIFICATE headers */ 258 if (!strcmp(nm, PEM_STRING_X509) && 259 !strcmp(name, PEM_STRING_PKCS7)) 260 return 1; 261 262 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && 263 !strcmp(name, PEM_STRING_PKCS7)) 264 return 1; 265 266 267 return 0; 268 } 269 270 int 271 PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, 272 const char *name, BIO *bp, pem_password_cb *cb, void *u) 273 { 274 EVP_CIPHER_INFO cipher; 275 char *nm = NULL, *header = NULL; 276 unsigned char *data = NULL; 277 long len; 278 int ret = 0; 279 280 for (;;) { 281 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) { 282 if (ERR_GET_REASON(ERR_peek_error()) == 283 PEM_R_NO_START_LINE) 284 ERR_asprintf_error_data("Expecting: %s", name); 285 return 0; 286 } 287 if (check_pem(nm, name)) 288 break; 289 free(nm); 290 free(header); 291 free(data); 292 } 293 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) 294 goto err; 295 if (!PEM_do_header(&cipher, data, &len, cb, u)) 296 goto err; 297 298 *pdata = data; 299 *plen = len; 300 301 if (pnm) 302 *pnm = nm; 303 304 ret = 1; 305 306 err: 307 if (!ret || !pnm) 308 free(nm); 309 free(header); 310 if (!ret) 311 free(data); 312 return ret; 313 } 314 315 int 316 PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x, 317 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 318 pem_password_cb *callback, void *u) 319 { 320 BIO *b; 321 int ret; 322 323 if ((b = BIO_new(BIO_s_file())) == NULL) { 324 PEMerror(ERR_R_BUF_LIB); 325 return (0); 326 } 327 BIO_set_fp(b, fp, BIO_NOCLOSE); 328 ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u); 329 BIO_free(b); 330 return (ret); 331 } 332 333 int 334 PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x, 335 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 336 pem_password_cb *callback, void *u) 337 { 338 EVP_CIPHER_CTX ctx; 339 int dsize = 0, i, j, ret = 0; 340 unsigned char *p, *data = NULL; 341 const char *objstr = NULL; 342 char buf[PEM_BUFSIZE]; 343 unsigned char key[EVP_MAX_KEY_LENGTH]; 344 unsigned char iv[EVP_MAX_IV_LENGTH]; 345 346 if (enc != NULL) { 347 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); 348 if (objstr == NULL) { 349 PEMerror(PEM_R_UNSUPPORTED_CIPHER); 350 goto err; 351 } 352 } 353 354 if ((dsize = i2d(x, NULL)) < 0) { 355 PEMerror(ERR_R_ASN1_LIB); 356 dsize = 0; 357 goto err; 358 } 359 /* dzise + 8 bytes are needed */ 360 /* actually it needs the cipher block size extra... */ 361 data = malloc(dsize + 20); 362 if (data == NULL) { 363 PEMerror(ERR_R_MALLOC_FAILURE); 364 goto err; 365 } 366 p = data; 367 i = i2d(x, &p); 368 369 if (enc != NULL) { 370 if (kstr == NULL) { 371 if (callback == NULL) 372 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); 373 else 374 klen = (*callback)(buf, PEM_BUFSIZE, 1, u); 375 if (klen <= 0) { 376 PEMerror(PEM_R_READ_KEY); 377 goto err; 378 } 379 kstr = (unsigned char *)buf; 380 } 381 if ((size_t)enc->iv_len > sizeof(iv)) { 382 PEMerror(EVP_R_IV_TOO_LARGE); 383 goto err; 384 } 385 arc4random_buf(iv, enc->iv_len); /* Generate a salt */ 386 /* The 'iv' is used as the iv and as a salt. It is 387 * NOT taken from the BytesToKey function */ 388 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, 389 key, NULL)) 390 goto err; 391 392 if (kstr == (unsigned char *)buf) 393 explicit_bzero(buf, PEM_BUFSIZE); 394 395 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) { 396 PEMerror(ASN1_R_BUFFER_TOO_SMALL); 397 goto err; 398 } 399 400 buf[0] = '\0'; 401 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); 402 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv); 403 /* k=strlen(buf); */ 404 405 EVP_CIPHER_CTX_init(&ctx); 406 ret = 1; 407 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) || 408 !EVP_EncryptUpdate(&ctx, data, &j, data, i) || 409 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i)) 410 ret = 0; 411 EVP_CIPHER_CTX_cleanup(&ctx); 412 if (ret == 0) 413 goto err; 414 i += j; 415 } else { 416 ret = 1; 417 buf[0] = '\0'; 418 } 419 i = PEM_write_bio(bp, name, buf, data, i); 420 if (i <= 0) 421 ret = 0; 422 err: 423 explicit_bzero(key, sizeof(key)); 424 explicit_bzero(iv, sizeof(iv)); 425 explicit_bzero((char *)&ctx, sizeof(ctx)); 426 explicit_bzero(buf, PEM_BUFSIZE); 427 freezero(data, (unsigned int)dsize); 428 return (ret); 429 } 430 431 int 432 PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, 433 pem_password_cb *callback, void *u) 434 { 435 int i, j, o, klen; 436 long len; 437 EVP_CIPHER_CTX ctx; 438 unsigned char key[EVP_MAX_KEY_LENGTH]; 439 char buf[PEM_BUFSIZE]; 440 441 len = *plen; 442 443 if (cipher->cipher == NULL) 444 return (1); 445 if (callback == NULL) 446 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); 447 else 448 klen = callback(buf, PEM_BUFSIZE, 0, u); 449 if (klen <= 0) { 450 PEMerror(PEM_R_BAD_PASSWORD_READ); 451 return (0); 452 } 453 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), 454 (unsigned char *)buf, klen, 1, key, NULL)) 455 return 0; 456 457 j = (int)len; 458 EVP_CIPHER_CTX_init(&ctx); 459 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, 460 &(cipher->iv[0])); 461 if (o) 462 o = EVP_DecryptUpdate(&ctx, data, &i, data, j); 463 if (o) 464 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j); 465 EVP_CIPHER_CTX_cleanup(&ctx); 466 explicit_bzero((char *)buf, sizeof(buf)); 467 explicit_bzero((char *)key, sizeof(key)); 468 if (!o) { 469 PEMerror(PEM_R_BAD_DECRYPT); 470 return (0); 471 } 472 *plen = j + i; 473 return (1); 474 } 475 476 int 477 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 478 { 479 const EVP_CIPHER *enc = NULL; 480 char *p, c; 481 char **header_pp = &header; 482 483 cipher->cipher = NULL; 484 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 485 return (1); 486 if (strncmp(header, "Proc-Type: ", 11) != 0) { 487 PEMerror(PEM_R_NOT_PROC_TYPE); 488 return (0); 489 } 490 header += 11; 491 if (*header != '4') 492 return (0); 493 header++; 494 if (*header != ',') 495 return (0); 496 header++; 497 if (strncmp(header, "ENCRYPTED", 9) != 0) { 498 PEMerror(PEM_R_NOT_ENCRYPTED); 499 return (0); 500 } 501 for (; (*header != '\n') && (*header != '\0'); header++) 502 ; 503 if (*header == '\0') { 504 PEMerror(PEM_R_SHORT_HEADER); 505 return (0); 506 } 507 header++; 508 if (strncmp(header, "DEK-Info: ", 10) != 0) { 509 PEMerror(PEM_R_NOT_DEK_INFO); 510 return (0); 511 } 512 header += 10; 513 514 p = header; 515 for (;;) { 516 c= *header; 517 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') || 518 ((c >= '0') && (c <= '9')))) 519 break; 520 header++; 521 } 522 *header = '\0'; 523 cipher->cipher = enc = EVP_get_cipherbyname(p); 524 *header = c; 525 header++; 526 527 if (enc == NULL) { 528 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION); 529 return (0); 530 } 531 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len)) 532 return (0); 533 534 return (1); 535 } 536 537 static int 538 load_iv(char **fromp, unsigned char *to, int num) 539 { 540 int v, i; 541 char *from; 542 543 from= *fromp; 544 for (i = 0; i < num; i++) 545 to[i] = 0; 546 num *= 2; 547 for (i = 0; i < num; i++) { 548 if ((*from >= '0') && (*from <= '9')) 549 v = *from - '0'; 550 else if ((*from >= 'A') && (*from <= 'F')) 551 v = *from - 'A' + 10; 552 else if ((*from >= 'a') && (*from <= 'f')) 553 v = *from - 'a' + 10; 554 else { 555 PEMerror(PEM_R_BAD_IV_CHARS); 556 return (0); 557 } 558 from++; 559 to[i / 2] |= v << (long)((!(i & 1)) * 4); 560 } 561 562 *fromp = from; 563 return (1); 564 } 565 566 int 567 PEM_write(FILE *fp, const char *name, const char *header, 568 const 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, const char *header, 585 const unsigned char *data, 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 if (!EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n)) 617 goto err; 618 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) 619 goto err; 620 i += outl; 621 len -= n; 622 j += n; 623 } 624 EVP_EncodeFinal(&ctx, buf, &outl); 625 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) 626 goto err; 627 freezero(buf, PEM_BUFSIZE * 8); 628 buf = NULL; 629 if ((BIO_write(bp, "-----END ", 9) != 9) || 630 (BIO_write(bp, name, nlen) != nlen) || 631 (BIO_write(bp, "-----\n", 6) != 6)) 632 goto err; 633 return (i + outl); 634 635 err: 636 freezero(buf, PEM_BUFSIZE * 8); 637 PEMerror(reason); 638 return (0); 639 } 640 641 int 642 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len) 643 { 644 BIO *b; 645 int ret; 646 647 if ((b = BIO_new(BIO_s_file())) == NULL) { 648 PEMerror(ERR_R_BUF_LIB); 649 return (0); 650 } 651 BIO_set_fp(b, fp, BIO_NOCLOSE); 652 ret = PEM_read_bio(b, name, header, data, len); 653 BIO_free(b); 654 return (ret); 655 } 656 657 int 658 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 659 long *len) 660 { 661 EVP_ENCODE_CTX ctx; 662 int end = 0, i, k, bl = 0, hl = 0, nohead = 0; 663 char buf[256]; 664 BUF_MEM *nameB; 665 BUF_MEM *headerB; 666 BUF_MEM *dataB, *tmpB; 667 668 nameB = BUF_MEM_new(); 669 headerB = BUF_MEM_new(); 670 dataB = BUF_MEM_new(); 671 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { 672 BUF_MEM_free(nameB); 673 BUF_MEM_free(headerB); 674 BUF_MEM_free(dataB); 675 PEMerror(ERR_R_MALLOC_FAILURE); 676 return (0); 677 } 678 679 buf[254] = '\0'; 680 for (;;) { 681 i = BIO_gets(bp, buf, 254); 682 683 if (i <= 0) { 684 PEMerror(PEM_R_NO_START_LINE); 685 goto err; 686 } 687 688 while ((i >= 0) && (buf[i] <= ' ')) 689 i--; 690 buf[++i] = '\n'; 691 buf[++i] = '\0'; 692 693 if (strncmp(buf, "-----BEGIN ", 11) == 0) { 694 i = strlen(&(buf[11])); 695 696 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) 697 continue; 698 if (!BUF_MEM_grow(nameB, i + 9)) { 699 PEMerror(ERR_R_MALLOC_FAILURE); 700 goto err; 701 } 702 memcpy(nameB->data, &(buf[11]), i - 6); 703 nameB->data[i - 6] = '\0'; 704 break; 705 } 706 } 707 hl = 0; 708 if (!BUF_MEM_grow(headerB, 256)) { 709 PEMerror(ERR_R_MALLOC_FAILURE); 710 goto err; 711 } 712 headerB->data[0] = '\0'; 713 for (;;) { 714 i = BIO_gets(bp, buf, 254); 715 if (i <= 0) 716 break; 717 718 while ((i >= 0) && (buf[i] <= ' ')) 719 i--; 720 buf[++i] = '\n'; 721 buf[++i] = '\0'; 722 723 if (buf[0] == '\n') 724 break; 725 if (!BUF_MEM_grow(headerB, hl + i + 9)) { 726 PEMerror(ERR_R_MALLOC_FAILURE); 727 goto err; 728 } 729 if (strncmp(buf, "-----END ", 9) == 0) { 730 nohead = 1; 731 break; 732 } 733 memcpy(&(headerB->data[hl]), buf, i); 734 headerB->data[hl + i] = '\0'; 735 hl += i; 736 } 737 738 bl = 0; 739 if (!BUF_MEM_grow(dataB, 1024)) { 740 PEMerror(ERR_R_MALLOC_FAILURE); 741 goto err; 742 } 743 dataB->data[0] = '\0'; 744 if (!nohead) { 745 for (;;) { 746 i = BIO_gets(bp, buf, 254); 747 if (i <= 0) 748 break; 749 750 while ((i >= 0) && (buf[i] <= ' ')) 751 i--; 752 buf[++i] = '\n'; 753 buf[++i] = '\0'; 754 755 if (i != 65) 756 end = 1; 757 if (strncmp(buf, "-----END ", 9) == 0) 758 break; 759 if (i > 65) 760 break; 761 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { 762 PEMerror(ERR_R_MALLOC_FAILURE); 763 goto err; 764 } 765 memcpy(&(dataB->data[bl]), buf, i); 766 dataB->data[bl + i] = '\0'; 767 bl += i; 768 if (end) { 769 buf[0] = '\0'; 770 i = BIO_gets(bp, buf, 254); 771 if (i <= 0) 772 break; 773 774 while ((i >= 0) && (buf[i] <= ' ')) 775 i--; 776 buf[++i] = '\n'; 777 buf[++i] = '\0'; 778 779 break; 780 } 781 } 782 } else { 783 tmpB = headerB; 784 headerB = dataB; 785 dataB = tmpB; 786 bl = hl; 787 } 788 i = strlen(nameB->data); 789 if ((strncmp(buf, "-----END ", 9) != 0) || 790 (strncmp(nameB->data, &(buf[9]), i) != 0) || 791 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { 792 PEMerror(PEM_R_BAD_END_LINE); 793 goto err; 794 } 795 796 EVP_DecodeInit(&ctx); 797 i = EVP_DecodeUpdate(&ctx, 798 (unsigned char *)dataB->data, &bl, 799 (unsigned char *)dataB->data, bl); 800 if (i < 0) { 801 PEMerror(PEM_R_BAD_BASE64_DECODE); 802 goto err; 803 } 804 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k); 805 if (i < 0) { 806 PEMerror(PEM_R_BAD_BASE64_DECODE); 807 goto err; 808 } 809 bl += k; 810 811 if (bl == 0) 812 goto err; 813 *name = nameB->data; 814 *header = headerB->data; 815 *data = (unsigned char *)dataB->data; 816 *len = bl; 817 free(nameB); 818 free(headerB); 819 free(dataB); 820 return (1); 821 822 err: 823 BUF_MEM_free(nameB); 824 BUF_MEM_free(headerB); 825 BUF_MEM_free(dataB); 826 return (0); 827 } 828 829 /* Check pem string and return prefix length. 830 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" 831 * the return value is 3 for the string "RSA". 832 */ 833 834 int 835 pem_check_suffix(const char *pem_str, const char *suffix) 836 { 837 int pem_len = strlen(pem_str); 838 int suffix_len = strlen(suffix); 839 const char *p; 840 841 if (suffix_len + 1 >= pem_len) 842 return 0; 843 p = pem_str + pem_len - suffix_len; 844 if (strcmp(p, suffix)) 845 return 0; 846 p--; 847 if (*p != ' ') 848 return 0; 849 return p - pem_str; 850 } 851