1 /* crypto/pem/pem_lib.c */ 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 <stdio.h> 60 #include <ctype.h> 61 #include "cryptlib.h" 62 #include <openssl/buffer.h> 63 #include <openssl/objects.h> 64 #include <openssl/evp.h> 65 #include <openssl/rand.h> 66 #include <openssl/x509.h> 67 #include <openssl/pem.h> 68 #include <openssl/pkcs12.h> 69 #include "asn1_locl.h" 70 #ifndef OPENSSL_NO_DES 71 # include <openssl/des.h> 72 #endif 73 #ifndef OPENSSL_NO_ENGINE 74 # include <openssl/engine.h> 75 #endif 76 77 const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT; 78 79 #define MIN_LENGTH 4 80 81 static int load_iv(char **fromp, unsigned char *to, int num); 82 static int check_pem(const char *nm, const char *name); 83 int pem_check_suffix(const char *pem_str, const char *suffix); 84 85 int PEM_def_callback(char *buf, int num, int w, void *key) 86 { 87 #ifdef OPENSSL_NO_FP_API 88 /* 89 * We should not ever call the default callback routine from windows. 90 */ 91 PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 92 return (-1); 93 #else 94 int i, j; 95 const char *prompt; 96 if (key) { 97 i = strlen(key); 98 i = (i > num) ? num : i; 99 memcpy(buf, key, i); 100 return (i); 101 } 102 103 prompt = EVP_get_pw_prompt(); 104 if (prompt == NULL) 105 prompt = "Enter PEM pass phrase:"; 106 107 for (;;) { 108 /* 109 * We assume that w == 0 means decryption, 110 * while w == 1 means encryption 111 */ 112 int min_len = w ? MIN_LENGTH : 0; 113 114 i = EVP_read_pw_string_min(buf, min_len, num, prompt, w); 115 if (i != 0) { 116 PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD); 117 memset(buf, 0, (unsigned int)num); 118 return (-1); 119 } 120 j = strlen(buf); 121 if (min_len && j < min_len) { 122 fprintf(stderr, 123 "phrase is too short, needs to be at least %d chars\n", 124 min_len); 125 } else 126 break; 127 } 128 return (j); 129 #endif 130 } 131 132 void 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 BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE); 146 BUF_strlcat(buf, str, PEM_BUFSIZE); 147 BUF_strlcat(buf, "\n", PEM_BUFSIZE); 148 } 149 150 void 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 BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE); 157 BUF_strlcat(buf, type, PEM_BUFSIZE); 158 BUF_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 #ifndef OPENSSL_NO_FP_API 171 void *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 PEMerr(PEM_F_PEM_ASN1_READ, 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 #endif 187 188 static int 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 /* 206 * NB: ENGINE implementations wont contain a deprecated old 207 * private key decode function 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 /* If reading DH parameters handle X9.42 DH format too */ 239 if (!strcmp(nm, PEM_STRING_DHXPARAMS) && 240 !strcmp(name, PEM_STRING_DHPARAMS)) 241 return 1; 242 243 /* Permit older strings */ 244 245 if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509)) 246 return 1; 247 248 if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) && 249 !strcmp(name, PEM_STRING_X509_REQ)) 250 return 1; 251 252 /* Allow normal certs to be read as trusted certs */ 253 if (!strcmp(nm, PEM_STRING_X509) && 254 !strcmp(name, PEM_STRING_X509_TRUSTED)) 255 return 1; 256 257 if (!strcmp(nm, PEM_STRING_X509_OLD) && 258 !strcmp(name, PEM_STRING_X509_TRUSTED)) 259 return 1; 260 261 /* Some CAs use PKCS#7 with CERTIFICATE headers */ 262 if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7)) 263 return 1; 264 265 if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) && 266 !strcmp(name, PEM_STRING_PKCS7)) 267 return 1; 268 269 #ifndef OPENSSL_NO_CMS 270 if (!strcmp(nm, PEM_STRING_X509) && !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) && !strcmp(name, PEM_STRING_CMS)) 274 return 1; 275 #endif 276 277 return 0; 278 } 279 280 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, 281 const char *name, BIO *bp, pem_password_cb *cb, 282 void *u) 283 { 284 EVP_CIPHER_INFO cipher; 285 char *nm = NULL, *header = NULL; 286 unsigned char *data = NULL; 287 long len; 288 int ret = 0; 289 290 for (;;) { 291 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) { 292 if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE) 293 ERR_add_error_data(2, "Expecting: ", name); 294 return 0; 295 } 296 if (check_pem(nm, name)) 297 break; 298 OPENSSL_free(nm); 299 OPENSSL_free(header); 300 OPENSSL_free(data); 301 } 302 if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) 303 goto err; 304 if (!PEM_do_header(&cipher, data, &len, cb, u)) 305 goto err; 306 307 *pdata = data; 308 *plen = len; 309 310 if (pnm) 311 *pnm = nm; 312 313 ret = 1; 314 315 err: 316 if (!ret || !pnm) 317 OPENSSL_free(nm); 318 OPENSSL_free(header); 319 if (!ret) 320 OPENSSL_free(data); 321 return ret; 322 } 323 324 #ifndef OPENSSL_NO_FP_API 325 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, 326 void *x, const EVP_CIPHER *enc, unsigned char *kstr, 327 int klen, pem_password_cb *callback, void *u) 328 { 329 BIO *b; 330 int ret; 331 332 if ((b = BIO_new(BIO_s_file())) == NULL) { 333 PEMerr(PEM_F_PEM_ASN1_WRITE, 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 } 341 #endif 342 343 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, 344 void *x, const EVP_CIPHER *enc, unsigned char *kstr, 345 int klen, pem_password_cb *callback, void *u) 346 { 347 EVP_CIPHER_CTX ctx; 348 int dsize = 0, i, j, ret = 0; 349 unsigned char *p, *data = NULL; 350 const char *objstr = NULL; 351 char buf[PEM_BUFSIZE]; 352 unsigned char key[EVP_MAX_KEY_LENGTH]; 353 unsigned char iv[EVP_MAX_IV_LENGTH]; 354 355 if (enc != NULL) { 356 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); 357 if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) { 358 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER); 359 goto err; 360 } 361 } 362 363 if ((dsize = i2d(x, NULL)) < 0) { 364 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB); 365 dsize = 0; 366 goto err; 367 } 368 /* dzise + 8 bytes are needed */ 369 /* actually it needs the cipher block size extra... */ 370 data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20); 371 if (data == NULL) { 372 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE); 373 goto err; 374 } 375 p = data; 376 i = i2d(x, &p); 377 378 if (enc != NULL) { 379 if (kstr == NULL) { 380 if (callback == NULL) 381 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); 382 else 383 klen = (*callback) (buf, PEM_BUFSIZE, 1, u); 384 if (klen <= 0) { 385 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY); 386 goto err; 387 } 388 #ifdef CHARSET_EBCDIC 389 /* Convert the pass phrase from EBCDIC */ 390 ebcdic2ascii(buf, buf, klen); 391 #endif 392 kstr = (unsigned char *)buf; 393 } 394 RAND_add(data, i, 0); /* put in the RSA key. */ 395 OPENSSL_assert(enc->iv_len <= (int)sizeof(iv)); 396 if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */ 397 goto err; 398 /* 399 * The 'iv' is used as the iv and as a salt. It is NOT taken from 400 * the BytesToKey function 401 */ 402 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL)) 403 goto err; 404 405 if (kstr == (unsigned char *)buf) 406 OPENSSL_cleanse(buf, PEM_BUFSIZE); 407 408 OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <= 409 sizeof buf); 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 OPENSSL_cleanse(key, sizeof(key)); 435 OPENSSL_cleanse(iv, sizeof(iv)); 436 OPENSSL_cleanse((char *)&ctx, sizeof(ctx)); 437 OPENSSL_cleanse(buf, PEM_BUFSIZE); 438 if (data != NULL) { 439 OPENSSL_cleanse(data, (unsigned int)dsize); 440 OPENSSL_free(data); 441 } 442 return (ret); 443 } 444 445 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, 446 pem_password_cb *callback, void *u) 447 { 448 int i = 0, j, o, klen; 449 long len; 450 EVP_CIPHER_CTX ctx; 451 unsigned char key[EVP_MAX_KEY_LENGTH]; 452 char buf[PEM_BUFSIZE]; 453 454 len = *plen; 455 456 if (cipher->cipher == NULL) 457 return (1); 458 if (callback == NULL) 459 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); 460 else 461 klen = callback(buf, PEM_BUFSIZE, 0, u); 462 if (klen <= 0) { 463 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ); 464 return (0); 465 } 466 #ifdef CHARSET_EBCDIC 467 /* Convert the pass phrase from EBCDIC */ 468 ebcdic2ascii(buf, buf, klen); 469 #endif 470 471 if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), 472 (unsigned char *)buf, klen, 1, key, NULL)) 473 return 0; 474 475 j = (int)len; 476 EVP_CIPHER_CTX_init(&ctx); 477 o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(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 OPENSSL_cleanse((char *)buf, sizeof(buf)); 484 OPENSSL_cleanse((char *)key, sizeof(key)); 485 if (o) 486 j += i; 487 else { 488 PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT); 489 return (0); 490 } 491 *plen = j; 492 return (1); 493 } 494 495 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) 496 { 497 const EVP_CIPHER *enc = NULL; 498 char *p, c; 499 char **header_pp = &header; 500 501 cipher->cipher = NULL; 502 if ((header == NULL) || (*header == '\0') || (*header == '\n')) 503 return (1); 504 if (strncmp(header, "Proc-Type: ", 11) != 0) { 505 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE); 506 return (0); 507 } 508 header += 11; 509 if (*header != '4') 510 return (0); 511 header++; 512 if (*header != ',') 513 return (0); 514 header++; 515 if (strncmp(header, "ENCRYPTED", 9) != 0) { 516 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED); 517 return (0); 518 } 519 for (; (*header != '\n') && (*header != '\0'); header++) ; 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 #ifndef CHARSET_EBCDIC 535 if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') || 536 ((c >= '0') && (c <= '9')))) 537 break; 538 #else 539 if (!(isupper(c) || (c == '-') || isdigit(c))) 540 break; 541 #endif 542 header++; 543 } 544 *header = '\0'; 545 cipher->cipher = enc = EVP_get_cipherbyname(p); 546 *header = c; 547 header++; 548 549 if (enc == NULL) { 550 PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION); 551 return (0); 552 } 553 if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len)) 554 return (0); 555 556 return (1); 557 } 558 559 static int load_iv(char **fromp, unsigned char *to, int num) 560 { 561 int v, i; 562 char *from; 563 564 from = *fromp; 565 for (i = 0; i < num; i++) 566 to[i] = 0; 567 num *= 2; 568 for (i = 0; i < num; i++) { 569 if ((*from >= '0') && (*from <= '9')) 570 v = *from - '0'; 571 else if ((*from >= 'A') && (*from <= 'F')) 572 v = *from - 'A' + 10; 573 else if ((*from >= 'a') && (*from <= 'f')) 574 v = *from - 'a' + 10; 575 else { 576 PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS); 577 return (0); 578 } 579 from++; 580 to[i / 2] |= v << (long)((!(i & 1)) * 4); 581 } 582 583 *fromp = from; 584 return (1); 585 } 586 587 #ifndef OPENSSL_NO_FP_API 588 int PEM_write(FILE *fp, const char *name, const char *header, 589 const unsigned char *data, long len) 590 { 591 BIO *b; 592 int ret; 593 594 if ((b = BIO_new(BIO_s_file())) == NULL) { 595 PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB); 596 return (0); 597 } 598 BIO_set_fp(b, fp, BIO_NOCLOSE); 599 ret = PEM_write_bio(b, name, header, data, len); 600 BIO_free(b); 601 return (ret); 602 } 603 #endif 604 605 int PEM_write_bio(BIO *bp, const char *name, const char *header, 606 const unsigned char *data, long len) 607 { 608 int nlen, n, i, j, outl; 609 unsigned char *buf = NULL; 610 EVP_ENCODE_CTX ctx; 611 int reason = ERR_R_BUF_LIB; 612 613 EVP_EncodeInit(&ctx); 614 nlen = strlen(name); 615 616 if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || 617 (BIO_write(bp, name, nlen) != nlen) || 618 (BIO_write(bp, "-----\n", 6) != 6)) 619 goto err; 620 621 i = strlen(header); 622 if (i > 0) { 623 if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1)) 624 goto err; 625 } 626 627 buf = OPENSSL_malloc(PEM_BUFSIZE * 8); 628 if (buf == NULL) { 629 reason = ERR_R_MALLOC_FAILURE; 630 goto err; 631 } 632 633 i = j = 0; 634 while (len > 0) { 635 n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); 636 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n); 637 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) 638 goto err; 639 i += outl; 640 len -= n; 641 j += n; 642 } 643 EVP_EncodeFinal(&ctx, buf, &outl); 644 if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) 645 goto err; 646 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8); 647 OPENSSL_free(buf); 648 buf = NULL; 649 if ((BIO_write(bp, "-----END ", 9) != 9) || 650 (BIO_write(bp, name, nlen) != nlen) || 651 (BIO_write(bp, "-----\n", 6) != 6)) 652 goto err; 653 return (i + outl); 654 err: 655 if (buf) { 656 OPENSSL_cleanse(buf, PEM_BUFSIZE * 8); 657 OPENSSL_free(buf); 658 } 659 PEMerr(PEM_F_PEM_WRITE_BIO, reason); 660 return (0); 661 } 662 663 #ifndef OPENSSL_NO_FP_API 664 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data, 665 long *len) 666 { 667 BIO *b; 668 int ret; 669 670 if ((b = BIO_new(BIO_s_file())) == NULL) { 671 PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB); 672 return (0); 673 } 674 BIO_set_fp(b, fp, BIO_NOCLOSE); 675 ret = PEM_read_bio(b, name, header, data, len); 676 BIO_free(b); 677 return (ret); 678 } 679 #endif 680 681 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, 682 long *len) 683 { 684 EVP_ENCODE_CTX ctx; 685 int end = 0, i, k, bl = 0, hl = 0, nohead = 0; 686 char buf[256]; 687 BUF_MEM *nameB; 688 BUF_MEM *headerB; 689 BUF_MEM *dataB, *tmpB; 690 691 nameB = BUF_MEM_new(); 692 headerB = BUF_MEM_new(); 693 dataB = BUF_MEM_new(); 694 if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) { 695 BUF_MEM_free(nameB); 696 BUF_MEM_free(headerB); 697 BUF_MEM_free(dataB); 698 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 699 return (0); 700 } 701 702 buf[254] = '\0'; 703 for (;;) { 704 i = BIO_gets(bp, buf, 254); 705 706 if (i <= 0) { 707 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE); 708 goto err; 709 } 710 711 while ((i >= 0) && (buf[i] <= ' ')) 712 i--; 713 buf[++i] = '\n'; 714 buf[++i] = '\0'; 715 716 if (strncmp(buf, "-----BEGIN ", 11) == 0) { 717 i = strlen(&(buf[11])); 718 719 if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0) 720 continue; 721 if (!BUF_MEM_grow(nameB, i + 9)) { 722 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 723 goto err; 724 } 725 memcpy(nameB->data, &(buf[11]), i - 6); 726 nameB->data[i - 6] = '\0'; 727 break; 728 } 729 } 730 hl = 0; 731 if (!BUF_MEM_grow(headerB, 256)) { 732 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 733 goto err; 734 } 735 headerB->data[0] = '\0'; 736 for (;;) { 737 i = BIO_gets(bp, buf, 254); 738 if (i <= 0) 739 break; 740 741 while ((i >= 0) && (buf[i] <= ' ')) 742 i--; 743 buf[++i] = '\n'; 744 buf[++i] = '\0'; 745 746 if (buf[0] == '\n') 747 break; 748 if (!BUF_MEM_grow(headerB, hl + i + 9)) { 749 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 750 goto err; 751 } 752 if (strncmp(buf, "-----END ", 9) == 0) { 753 nohead = 1; 754 break; 755 } 756 memcpy(&(headerB->data[hl]), buf, i); 757 headerB->data[hl + i] = '\0'; 758 hl += i; 759 } 760 761 bl = 0; 762 if (!BUF_MEM_grow(dataB, 1024)) { 763 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 764 goto err; 765 } 766 dataB->data[0] = '\0'; 767 if (!nohead) { 768 for (;;) { 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 if (i != 65) 779 end = 1; 780 if (strncmp(buf, "-----END ", 9) == 0) 781 break; 782 if (i > 65) 783 break; 784 if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) { 785 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE); 786 goto err; 787 } 788 memcpy(&(dataB->data[bl]), buf, i); 789 dataB->data[bl + i] = '\0'; 790 bl += i; 791 if (end) { 792 buf[0] = '\0'; 793 i = BIO_gets(bp, buf, 254); 794 if (i <= 0) 795 break; 796 797 while ((i >= 0) && (buf[i] <= ' ')) 798 i--; 799 buf[++i] = '\n'; 800 buf[++i] = '\0'; 801 802 break; 803 } 804 } 805 } else { 806 tmpB = headerB; 807 headerB = dataB; 808 dataB = tmpB; 809 bl = hl; 810 } 811 i = strlen(nameB->data); 812 if ((strncmp(buf, "-----END ", 9) != 0) || 813 (strncmp(nameB->data, &(buf[9]), i) != 0) || 814 (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) { 815 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE); 816 goto err; 817 } 818 819 EVP_DecodeInit(&ctx); 820 i = EVP_DecodeUpdate(&ctx, 821 (unsigned char *)dataB->data, &bl, 822 (unsigned char *)dataB->data, bl); 823 if (i < 0) { 824 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); 825 goto err; 826 } 827 i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k); 828 if (i < 0) { 829 PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE); 830 goto err; 831 } 832 bl += k; 833 834 if (bl == 0) 835 goto err; 836 *name = nameB->data; 837 *header = headerB->data; 838 *data = (unsigned char *)dataB->data; 839 *len = bl; 840 OPENSSL_free(nameB); 841 OPENSSL_free(headerB); 842 OPENSSL_free(dataB); 843 return (1); 844 err: 845 BUF_MEM_free(nameB); 846 BUF_MEM_free(headerB); 847 BUF_MEM_free(dataB); 848 return (0); 849 } 850 851 /* 852 * Check pem string and return prefix length. If for example the pem_str == 853 * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the 854 * string "RSA". 855 */ 856 857 int 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 if (suffix_len + 1 >= pem_len) 863 return 0; 864 p = pem_str + pem_len - suffix_len; 865 if (strcmp(p, suffix)) 866 return 0; 867 p--; 868 if (*p != ' ') 869 return 0; 870 return p - pem_str; 871 } 872