lib/libcrypto/pem/pem_lib.c

   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 }