1/* $OpenBSD: pem_lib.c,v 1.56 2024/02/18 15:44:10 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 78#include "asn1_local.h" 79#include "evp_local.h" 80 81#define MIN_LENGTH 4 82 83static int load_iv(char **fromp, unsigned char *to, int num); 84static int check_pem(const char *nm, const char *name); 85int pem_check_suffix(const char *pem_str, const char *suffix); 86 87/* XXX LSSL ABI XXX return value and `num' ought to be size_t */ 88int 89PEM_def_callback(char *buf, int num, int w, void *key) 90{ 91 size_t l; 92 int i; 93 const char *prompt; 94 95 if (num < 0) 96 return -1; 97 98 if (key) { 99 l = strlen(key); 100 if (l > (size_t)num) 101 l = (size_t)num; 102 memcpy(buf, key, l); 103 return (int)l; 104 } 105 106 prompt = EVP_get_pw_prompt(); 107 if (prompt == NULL) 108 prompt = "Enter PEM pass phrase:"; 109 110 for (;;) { 111 i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w); 112 if (i != 0) { 113 PEMerror(PEM_R_PROBLEMS_GETTING_PASSWORD); 114 memset(buf, 0, num); 115 return (-1); 116 } 117 l = strlen(buf); 118 if (l < MIN_LENGTH) { 119 fprintf(stderr, "phrase is too short, " 120 "needs to be at least %zu chars\n", 121 (size_t)MIN_LENGTH); 122 } else 123 break; 124 } 125 return (int)l; 126} 127LCRYPTO_ALIAS(PEM_def_callback); 128 129void 130PEM_proc_type(char *buf, int type) 131{ 132 const char *str; 133 134 if (type == PEM_TYPE_ENCRYPTED) 135 str = "ENCRYPTED"; 136 else if (type == PEM_TYPE_MIC_CLEAR) 137 str = "MIC-CLEAR"; 138 else if (type == PEM_TYPE_MIC_ONLY) 139 str = "MIC-ONLY"; 140 else 141 str = "BAD-TYPE"; 142 143 strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE); 144 strlcat(buf, str, PEM_BUFSIZE); 145 strlcat(buf, "\n", PEM_BUFSIZE); 146} 147LCRYPTO_ALIAS(PEM_proc_type); 148 149void 150PEM_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} 169LCRYPTO_ALIAS(PEM_dek_info); 170 171void * 172PEM_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} 187LCRYPTO_ALIAS(PEM_ASN1_read); 188 189static int 190check_pem(const char *nm, const char *name) 191{ 192 /* Normal matching nm and name */ 193 if (!strcmp(nm, name)) 194 return 1; 195 196 /* Make PEM_STRING_EVP_PKEY match any private key */ 197 198 if (!strcmp(name, PEM_STRING_EVP_PKEY)) { 199 int slen; 200 const EVP_PKEY_ASN1_METHOD *ameth; 201 if (!strcmp(nm, PEM_STRING_PKCS8)) 202 return 1; 203 if (!strcmp(nm, PEM_STRING_PKCS8INF)) 204 return 1; 205 slen = pem_check_suffix(nm, "PRIVATE KEY"); 206 if (slen > 0) { 207 /* NB: ENGINE implementations wont contain 208 * a deprecated old private key decode function 209 * so don't look for them. 210 */ 211 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); 212 if (ameth && ameth->old_priv_decode) 213 return 1; 214 } 215 return 0; 216 } 217 218 if (!strcmp(name, PEM_STRING_PARAMETERS)) { 219 int slen; 220 const EVP_PKEY_ASN1_METHOD *ameth; 221 slen = pem_check_suffix(nm, "PARAMETERS"); 222 if (slen > 0) { 223 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); 224 if (ameth) { 225 int r; 226 if (ameth->param_decode) 227 r = 1; 228 else 229 r = 0; 230 return r; 231 } 232 } 233 return 0; 234 } 235 236 /* Permit older strings */ 237 238 if (!strcmp(nm, PEM_STRING_X509_OLD) && 239 !strcmp(name, PEM_STRING_X509)) 240 return 1; 241 242 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) && 243 !strcmp(name, PEM_STRING_X509_REQ)) 244 return 1; 245 246 /* Allow normal certs to be read as trusted certs */ 247 if (!strcmp(nm, PEM_STRING_X509) && 248 !strcmp(name, PEM_STRING_X509_TRUSTED)) 249 return 1; 250 251 if (!strcmp(nm, PEM_STRING_X509_OLD) && 252 !strcmp(name, PEM_STRING_X509_TRUSTED)) 253 return 1; 254 255 /* Some CAs use PKCS#7 with CERTIFICATE headers */ 256 if (!strcmp(nm, PEM_STRING_X509) && 257 !strcmp(name, PEM_STRING_PKCS7)) 258 return 1; 259 260 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && 261 !strcmp(name, PEM_STRING_PKCS7)) 262 return 1; 263 264#ifndef OPENSSL_NO_CMS 265 if (strcmp(nm, PEM_STRING_X509) == 0 && 266 strcmp(name, PEM_STRING_CMS) == 0) 267 return 1; 268 269 /* Allow CMS to be read from PKCS#7 headers */ 270 if (strcmp(nm, PEM_STRING_PKCS7) == 0 && 271 strcmp(name, PEM_STRING_CMS) == 0) 272 return 1; 273#endif 274 275 return 0; 276} 277 278int 279PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, 280 const char *name, BIO *bp, pem_password_cb *cb, void *u) 281{ 282 EVP_CIPHER_INFO cipher; 283 char *nm = NULL, *header = NULL; 284 unsigned char *data = NULL; 285 long len; 286 int ret = 0; 287 288 for (;;) { 289 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) { 290 if (ERR_GET_REASON(ERR_peek_error()) == 291 PEM_R_NO_START_LINE) 292 ERR_asprintf_error_data("Expecting: %s", name); 293 return 0; 294 } 295 if (check_pem(nm, name)) 296 break; 297 free(nm); 298 free(header); 299 free(data); 300 } 301 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) 302 goto err; 303 if (!PEM_do_header(&cipher, data, &len, cb, u)) 304 goto err; 305 306 *pdata = data; 307 *plen = len; 308 309 if (pnm) 310 *pnm = nm; 311 312 ret = 1; 313 314err: 315 if (!ret || !pnm) 316 free(nm); 317 free(header); 318 if (!ret) 319 free(data); 320 return ret; 321} 322LCRYPTO_ALIAS(PEM_bytes_read_bio); 323 324int 325PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x, 326 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 327 pem_password_cb *callback, void *u) 328{ 329 BIO *b; 330 int ret; 331 332 if ((b = BIO_new(BIO_s_file())) == NULL) { 333 PEMerror(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} 341LCRYPTO_ALIAS(PEM_ASN1_write); 342 343int 344PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x, 345 const EVP_CIPHER *enc, unsigned char *kstr, int klen, 346 pem_password_cb *callback, void *u) 347{ 348 EVP_CIPHER_CTX ctx; 349 int dsize = 0, i, j, ret = 0; 350 unsigned char *p, *data = NULL; 351 const char *objstr = NULL; 352 char buf[PEM_BUFSIZE]; 353 unsigned char key[EVP_MAX_KEY_LENGTH]; 354 unsigned char iv[EVP_MAX_IV_LENGTH]; 355 356 if (enc != NULL) { 357 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); 358 if (objstr == NULL) { 359 PEMerror(PEM_R_UNSUPPORTED_CIPHER); 360 goto err; 361 } 362 } 363 364 if ((dsize = i2d(x, NULL)) < 0) { 365 PEMerror(ERR_R_ASN1_LIB); 366 dsize = 0; 367 goto err; 368 } 369 /* dzise + 8 bytes are needed */ 370 /* actually it needs the cipher block size extra... */ 371 data = malloc(dsize + 20); 372 if (data == NULL) { 373 PEMerror(ERR_R_MALLOC_FAILURE); 374 goto err; 375 } 376 p = data; 377 i = i2d(x, &p); 378 379 if (enc != NULL) { 380 if (kstr == NULL) { 381 if (callback == NULL) 382 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); 383 else 384 klen = (*callback)(buf, PEM_BUFSIZE, 1, u); 385 if (klen <= 0) { 386 PEMerror(PEM_R_READ_KEY); 387 goto err; 388 } 389 kstr = (unsigned char *)buf; 390 } 391 if ((size_t)enc->iv_len > sizeof(iv)) { 392 PEMerror(EVP_R_IV_TOO_LARGE); 393 goto err; 394 } 395 arc4random_buf(iv, enc->iv_len); /* Generate a salt */ 396 /* The 'iv' is used as the iv and as a salt. It is 397 * NOT taken from the BytesToKey function */ 398 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, 399 key, NULL)) 400 goto err; 401 402 if (kstr == (unsigned char *)buf) 403 explicit_bzero(buf, PEM_BUFSIZE); 404 405 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) { 406 PEMerror(ASN1_R_BUFFER_TOO_SMALL); 407 goto err; 408 } 409 410 buf[0] = '\0'; 411 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); 412 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv); 413 /* k=strlen(buf); */ 414 415 EVP_CIPHER_CTX_legacy_clear(&ctx); 416 ret = 1; 417 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) || 418 !EVP_EncryptUpdate(&ctx, data, &j, data, i) || 419 !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i)) 420 ret = 0; 421 EVP_CIPHER_CTX_cleanup(&ctx); 422 if (ret == 0) 423 goto err; 424 i += j; 425 } else { 426 ret = 1; 427 buf[0] = '\0'; 428 } 429 i = PEM_write_bio(bp, name, buf, data, i); 430 if (i <= 0) 431 ret = 0; 432err: 433 explicit_bzero(key, sizeof(key)); 434 explicit_bzero(iv, sizeof(iv)); 435 explicit_bzero((char *)&ctx, sizeof(ctx)); 436 explicit_bzero(buf, PEM_BUFSIZE); 437 freezero(data, (unsigned int)dsize); 438 return (ret); 439} 440LCRYPTO_ALIAS(PEM_ASN1_write_bio); 441 442int 443PEM_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_legacy_clear(&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} 486LCRYPTO_ALIAS(PEM_do_header); 487 488int 489PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 490{ 491 const EVP_CIPHER *enc = NULL; 492 char *p, c; 493 char **header_pp = &header; 494 495 cipher->cipher = NULL; 496 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 497 return (1); 498 if (strncmp(header, "Proc-Type: ", 11) != 0) { 499 PEMerror(PEM_R_NOT_PROC_TYPE); 500 return (0); 501 } 502 header += 11; 503 if (*header != '4') 504 return (0); 505 header++; 506 if (*header != ',') 507 return (0); 508 header++; 509 if (strncmp(header, "ENCRYPTED", 9) != 0) { 510 PEMerror(PEM_R_NOT_ENCRYPTED); 511 return (0); 512 } 513 for (; (*header != '\n') && (*header != '\0'); header++) 514 ; 515 if (*header == '\0') { 516 PEMerror(PEM_R_SHORT_HEADER); 517 return (0); 518 } 519 header++; 520 if (strncmp(header, "DEK-Info: ", 10) != 0) { 521 PEMerror(PEM_R_NOT_DEK_INFO); 522 return (0); 523 } 524 header += 10; 525 526 p = header; 527 for (;;) { 528 c= *header; 529 if (!( ((c >= 'A') && (c <= 'Z')) || (c == '-') || 530 ((c >= '0') && (c <= '9')))) 531 break; 532 header++; 533 } 534 *header = '\0'; 535 cipher->cipher = enc = EVP_get_cipherbyname(p); 536 *header = c; 537 header++; 538 539 if (enc == NULL) { 540 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION); 541 return (0); 542 } 543 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len)) 544 return (0); 545 546 return (1); 547} 548LCRYPTO_ALIAS(PEM_get_EVP_CIPHER_INFO); 549 550static int 551load_iv(char **fromp, unsigned char *to, int num) 552{ 553 int v, i; 554 char *from; 555 556 from= *fromp; 557 for (i = 0; i < num; i++) 558 to[i] = 0; 559 num *= 2; 560 for (i = 0; i < num; i++) { 561 if ((*from >= '0') && (*from <= '9')) 562 v = *from - '0'; 563 else if ((*from >= 'A') && (*from <= 'F')) 564 v = *from - 'A' + 10; 565 else if ((*from >= 'a') && (*from <= 'f')) 566 v = *from - 'a' + 10; 567 else { 568 PEMerror(PEM_R_BAD_IV_CHARS); 569 return (0); 570 } 571 from++; 572 to[i / 2] |= v << (long)((!(i & 1)) * 4); 573 } 574 575 *fromp = from; 576 return (1); 577} 578 579int 580PEM_write(FILE *fp, const char *name, const char *header, 581 const unsigned char *data, long len) 582{ 583 BIO *b; 584 int ret; 585 586 if ((b = BIO_new(BIO_s_file())) == NULL) { 587 PEMerror(ERR_R_BUF_LIB); 588 return (0); 589 } 590 BIO_set_fp(b, fp, BIO_NOCLOSE); 591 ret = PEM_write_bio(b, name, header, data, len); 592 BIO_free(b); 593 return (ret); 594} 595LCRYPTO_ALIAS(PEM_write); 596 597int 598PEM_write_bio(BIO *bp, const char *name, const char *header, 599 const unsigned char *data, long len) 600{ 601 int nlen, n, i, j, outl; 602 unsigned char *buf = NULL; 603 EVP_ENCODE_CTX ctx; 604 int reason = ERR_R_BUF_LIB; 605 606 EVP_EncodeInit(&ctx); 607 nlen = strlen(name); 608 609 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || 610 (BIO_write(bp, name, nlen) != nlen) || 611 (BIO_write(bp, "-----\n", 6) != 6)) 612 goto err; 613 614 if (header != NULL && (i = strlen(header)) > 0) { 615 if ((BIO_write(bp, header, i) != i) || 616 (BIO_write(bp, "\n", 1) != 1)) 617 goto err; 618 } 619 620 buf = reallocarray(NULL, PEM_BUFSIZE, 8); 621 if (buf == NULL) { 622 reason = ERR_R_MALLOC_FAILURE; 623 goto err; 624 } 625 626 i = j = 0; 627 while (len > 0) { 628 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); 629 if (!EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n)) 630 goto err; 631 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) 632 goto err; 633 i += outl; 634 len -= n; 635 j += n; 636 } 637 EVP_EncodeFinal(&ctx, buf, &outl); 638 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) 639 goto err; 640 freezero(buf, PEM_BUFSIZE * 8); 641 buf = NULL; 642 if ((BIO_write(bp, "-----END ", 9) != 9) || 643 (BIO_write(bp, name, nlen) != nlen) || 644 (BIO_write(bp, "-----\n", 6) != 6)) 645 goto err; 646 return (i + outl); 647 648err: 649 freezero(buf, PEM_BUFSIZE * 8); 650 PEMerror(reason); 651 return (0); 652} 653LCRYPTO_ALIAS(PEM_write_bio); 654 655int 656PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len) 657{ 658 BIO *b; 659 int ret; 660 661 if ((b = BIO_new(BIO_s_file())) == NULL) { 662 PEMerror(ERR_R_BUF_LIB); 663 return (0); 664 } 665 BIO_set_fp(b, fp, BIO_NOCLOSE); 666 ret = PEM_read_bio(b, name, header, data, len); 667 BIO_free(b); 668 return (ret); 669} 670LCRYPTO_ALIAS(PEM_read); 671 672int 673PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 674 long *len) 675{ 676 EVP_ENCODE_CTX ctx; 677 int end = 0, i, k, bl = 0, hl = 0, nohead = 0; 678 char buf[256]; 679 BUF_MEM *nameB; 680 BUF_MEM *headerB; 681 BUF_MEM *dataB, *tmpB; 682 683 nameB = BUF_MEM_new(); 684 headerB = BUF_MEM_new(); 685 dataB = BUF_MEM_new(); 686 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { 687 BUF_MEM_free(nameB); 688 BUF_MEM_free(headerB); 689 BUF_MEM_free(dataB); 690 PEMerror(ERR_R_MALLOC_FAILURE); 691 return (0); 692 } 693 694 buf[254] = '\0'; 695 for (;;) { 696 i = BIO_gets(bp, buf, 254); 697 698 if (i <= 0) { 699 PEMerror(PEM_R_NO_START_LINE); 700 goto err; 701 } 702 703 while ((i >= 0) && (buf[i] <= ' ')) 704 i--; 705 buf[++i] = '\n'; 706 buf[++i] = '\0'; 707 708 if (strncmp(buf, "-----BEGIN ", 11) == 0) { 709 i = strlen(&(buf[11])); 710 711 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) 712 continue; 713 if (!BUF_MEM_grow(nameB, i + 9)) { 714 PEMerror(ERR_R_MALLOC_FAILURE); 715 goto err; 716 } 717 memcpy(nameB->data, &(buf[11]), i - 6); 718 nameB->data[i - 6] = '\0'; 719 break; 720 } 721 } 722 hl = 0; 723 if (!BUF_MEM_grow(headerB, 256)) { 724 PEMerror(ERR_R_MALLOC_FAILURE); 725 goto err; 726 } 727 headerB->data[0] = '\0'; 728 for (;;) { 729 i = BIO_gets(bp, buf, 254); 730 if (i <= 0) 731 break; 732 733 while ((i >= 0) && (buf[i] <= ' ')) 734 i--; 735 buf[++i] = '\n'; 736 buf[++i] = '\0'; 737 738 if (buf[0] == '\n') 739 break; 740 if (!BUF_MEM_grow(headerB, hl + i + 9)) { 741 PEMerror(ERR_R_MALLOC_FAILURE); 742 goto err; 743 } 744 if (strncmp(buf, "-----END ", 9) == 0) { 745 nohead = 1; 746 break; 747 } 748 memcpy(&(headerB->data[hl]), buf, i); 749 headerB->data[hl + i] = '\0'; 750 hl += i; 751 } 752 753 bl = 0; 754 if (!BUF_MEM_grow(dataB, 1024)) { 755 PEMerror(ERR_R_MALLOC_FAILURE); 756 goto err; 757 } 758 dataB->data[0] = '\0'; 759 if (!nohead) { 760 for (;;) { 761 i = BIO_gets(bp, buf, 254); 762 if (i <= 0) 763 break; 764 765 while ((i >= 0) && (buf[i] <= ' ')) 766 i--; 767 buf[++i] = '\n'; 768 buf[++i] = '\0'; 769 770 if (i != 65) 771 end = 1; 772 if (strncmp(buf, "-----END ", 9) == 0) 773 break; 774 if (i > 65) 775 break; 776 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { 777 PEMerror(ERR_R_MALLOC_FAILURE); 778 goto err; 779 } 780 memcpy(&(dataB->data[bl]), buf, i); 781 dataB->data[bl + i] = '\0'; 782 bl += i; 783 if (end) { 784 buf[0] = '\0'; 785 i = BIO_gets(bp, buf, 254); 786 if (i <= 0) 787 break; 788 789 while ((i >= 0) && (buf[i] <= ' ')) 790 i--; 791 buf[++i] = '\n'; 792 buf[++i] = '\0'; 793 794 break; 795 } 796 } 797 } else { 798 tmpB = headerB; 799 headerB = dataB; 800 dataB = tmpB; 801 bl = hl; 802 } 803 i = strlen(nameB->data); 804 if ((strncmp(buf, "-----END ", 9) != 0) || 805 (strncmp(nameB->data, &(buf[9]), i) != 0) || 806 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { 807 PEMerror(PEM_R_BAD_END_LINE); 808 goto err; 809 } 810 811 EVP_DecodeInit(&ctx); 812 i = EVP_DecodeUpdate(&ctx, 813 (unsigned char *)dataB->data, &bl, 814 (unsigned char *)dataB->data, bl); 815 if (i < 0) { 816 PEMerror(PEM_R_BAD_BASE64_DECODE); 817 goto err; 818 } 819 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k); 820 if (i < 0) { 821 PEMerror(PEM_R_BAD_BASE64_DECODE); 822 goto err; 823 } 824 bl += k; 825 826 if (bl == 0) 827 goto err; 828 *name = nameB->data; 829 *header = headerB->data; 830 *data = (unsigned char *)dataB->data; 831 *len = bl; 832 free(nameB); 833 free(headerB); 834 free(dataB); 835 return (1); 836 837err: 838 BUF_MEM_free(nameB); 839 BUF_MEM_free(headerB); 840 BUF_MEM_free(dataB); 841 return (0); 842} 843LCRYPTO_ALIAS(PEM_read_bio); 844 845/* Check pem string and return prefix length. 846 * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" 847 * the return value is 3 for the string "RSA". 848 */ 849 850int 851pem_check_suffix(const char *pem_str, const char *suffix) 852{ 853 int pem_len = strlen(pem_str); 854 int suffix_len = strlen(suffix); 855 const char *p; 856 857 if (suffix_len + 1 >= pem_len) 858 return 0; 859 p = pem_str + pem_len - suffix_len; 860 if (strcmp(p, suffix)) 861 return 0; 862 p--; 863 if (*p != ' ') 864 return 0; 865 return p - pem_str; 866} 867