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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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