lib/libcrypto/pem/pem_lib.c

   1 /* $OpenBSD: pem_lib.c,v 1.45 2017/05/02 03:59:44 deraadt 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                                 if (e)
 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
 268         return 0;
 269 }
 270
 271 int
 272 PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
 273     const char *name, BIO *bp, pem_password_cb *cb, void *u)
 274 {
 275         EVP_CIPHER_INFO cipher;
 276         char *nm = NULL, *header = NULL;
 277         unsigned char *data = NULL;
 278         long len;
 279         int ret = 0;
 280
 281         for (;;) {
 282                 if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
 283                         if (ERR_GET_REASON(ERR_peek_error()) ==
 284                             PEM_R_NO_START_LINE)
 285                                 ERR_asprintf_error_data("Expecting: %s", name);
 286                         return 0;
 287                 }
 288                 if (check_pem(nm, name))
 289                         break;
 290                 free(nm);
 291                 free(header);
 292                 free(data);
 293         }
 294         if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 295                 goto err;
 296         if (!PEM_do_header(&cipher, data, &len, cb, u))
 297                 goto err;
 298
 299         *pdata = data;
 300         *plen = len;
 301
 302         if (pnm)
 303                 *pnm = nm;
 304
 305         ret = 1;
 306
 307 err:
 308         if (!ret || !pnm)
 309                 free(nm);
 310         free(header);
 311         if (!ret)
 312                 free(data);
 313         return ret;
 314 }
 315
 316 int
 317 PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, void *x,
 318     const EVP_CIPHER *enc, unsigned char *kstr, int klen,
 319     pem_password_cb *callback, void *u)
 320 {
 321         BIO *b;
 322         int ret;
 323
 324         if ((b = BIO_new(BIO_s_file())) == NULL) {
 325                 PEMerror(ERR_R_BUF_LIB);
 326                 return (0);
 327         }
 328         BIO_set_fp(b, fp, BIO_NOCLOSE);
 329         ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
 330         BIO_free(b);
 331         return (ret);
 332 }
 333
 334 int
 335 PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, void *x,
 336     const EVP_CIPHER *enc, unsigned char *kstr, int klen,
 337     pem_password_cb *callback, void *u)
 338 {
 339         EVP_CIPHER_CTX ctx;
 340         int dsize = 0, i, j, ret = 0;
 341         unsigned char *p, *data = NULL;
 342         const char *objstr = NULL;
 343         char buf[PEM_BUFSIZE];
 344         unsigned char key[EVP_MAX_KEY_LENGTH];
 345         unsigned char iv[EVP_MAX_IV_LENGTH];
 346
 347         if (enc != NULL) {
 348                 objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 349                 if (objstr == NULL) {
 350                         PEMerror(PEM_R_UNSUPPORTED_CIPHER);
 351                         goto err;
 352                 }
 353         }
 354
 355         if ((dsize = i2d(x, NULL)) < 0) {
 356                 PEMerror(ERR_R_ASN1_LIB);
 357                 dsize = 0;
 358                 goto err;
 359         }
 360         /* dzise + 8 bytes are needed */
 361         /* actually it needs the cipher block size extra... */
 362         data = malloc(dsize + 20);
 363         if (data == NULL) {
 364                 PEMerror(ERR_R_MALLOC_FAILURE);
 365                 goto err;
 366         }
 367         p = data;
 368         i = i2d(x, &p);
 369
 370         if (enc != NULL) {
 371                 if (kstr == NULL) {
 372                         if (callback == NULL)
 373                                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
 374                         else
 375                                 klen = (*callback)(buf, PEM_BUFSIZE, 1, u);
 376                         if (klen <= 0) {
 377                                 PEMerror(PEM_R_READ_KEY);
 378                                 goto err;
 379                         }
 380                         kstr = (unsigned char *)buf;
 381                 }
 382                 if ((size_t)enc->iv_len > sizeof(iv)) {
 383                         PEMerror(EVP_R_IV_TOO_LARGE);
 384                         goto err;
 385                 }
 386                 arc4random_buf(iv, enc->iv_len); /* Generate a salt */
 387                 /* The 'iv' is used as the iv and as a salt.  It is
 388                  * NOT taken from the BytesToKey function */
 389                 if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1,
 390                     key, NULL))
 391                         goto err;
 392
 393                 if (kstr == (unsigned char *)buf)
 394                         explicit_bzero(buf, PEM_BUFSIZE);
 395
 396                 if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) {
 397                         PEMerror(ASN1_R_BUFFER_TOO_SMALL);
 398                         goto err;
 399                 }
 400
 401                 buf[0] = '\0';
 402                 PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 403                 PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
 404                 /* k=strlen(buf); */
 405
 406                 EVP_CIPHER_CTX_init(&ctx);
 407                 ret = 1;
 408                 if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) ||
 409                     !EVP_EncryptUpdate(&ctx, data, &j, data, i) ||
 410                     !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
 411                         ret = 0;
 412                 EVP_CIPHER_CTX_cleanup(&ctx);
 413                 if (ret == 0)
 414                         goto err;
 415                 i += j;
 416         } else {
 417                 ret = 1;
 418                 buf[0] = '\0';
 419         }
 420         i = PEM_write_bio(bp, name, buf, data, i);
 421         if (i <= 0)
 422                 ret = 0;
 423 err:
 424         explicit_bzero(key, sizeof(key));
 425         explicit_bzero(iv, sizeof(iv));
 426         explicit_bzero((char *)&ctx, sizeof(ctx));
 427         explicit_bzero(buf, PEM_BUFSIZE);
 428         freezero(data, (unsigned int)dsize);
 429         return (ret);
 430 }
 431
 432 int
 433 PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 434     pem_password_cb *callback, void *u)
 435 {
 436         int i, j, o, klen;
 437         long len;
 438         EVP_CIPHER_CTX ctx;
 439         unsigned char key[EVP_MAX_KEY_LENGTH];
 440         char buf[PEM_BUFSIZE];
 441
 442         len = *plen;
 443
 444         if (cipher->cipher == NULL)
 445                 return (1);
 446         if (callback == NULL)
 447                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 448         else
 449                 klen = callback(buf, PEM_BUFSIZE, 0, u);
 450         if (klen <= 0) {
 451                 PEMerror(PEM_R_BAD_PASSWORD_READ);
 452                 return (0);
 453         }
 454         if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 455             (unsigned char *)buf, klen, 1, key, NULL))
 456                 return 0;
 457
 458         j = (int)len;
 459         EVP_CIPHER_CTX_init(&ctx);
 460         o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key,
 461             &(cipher->iv[0]));
 462         if (o)
 463                 o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
 464         if (o)
 465                 o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
 466         EVP_CIPHER_CTX_cleanup(&ctx);
 467         explicit_bzero((char *)buf, sizeof(buf));
 468         explicit_bzero((char *)key, sizeof(key));
 469         if (!o) {
 470                 PEMerror(PEM_R_BAD_DECRYPT);
 471                 return (0);
 472         }
 473         *plen = j + i;
 474         return (1);
 475 }
 476
 477 int
 478 PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 479 {
 480         const EVP_CIPHER *enc = NULL;
 481         char *p, c;
 482         char **header_pp = &header;
 483
 484         cipher->cipher = NULL;
 485         if ((header == NULL) || (*header == '\0') || (*header == '\n'))
 486                 return (1);
 487         if (strncmp(header, "Proc-Type: ", 11) != 0) {
 488                 PEMerror(PEM_R_NOT_PROC_TYPE);
 489                 return (0);
 490         }
 491         header += 11;
 492         if (*header != '4')
 493                 return (0);
 494         header++;
 495         if (*header != ',')
 496                 return (0);
 497         header++;
 498         if (strncmp(header, "ENCRYPTED", 9) != 0) {
 499                 PEMerror(PEM_R_NOT_ENCRYPTED);
 500                 return (0);
 501         }
 502         for (; (*header != '\n') && (*header != '\0'); header++)
 503                 ;
 504         if (*header == '\0') {
 505                 PEMerror(PEM_R_SHORT_HEADER);
 506                 return (0);
 507         }
 508         header++;
 509         if (strncmp(header, "DEK-Info: ", 10) != 0) {
 510                 PEMerror(PEM_R_NOT_DEK_INFO);
 511                 return (0);
 512         }
 513         header += 10;
 514
 515         p = header;
 516         for (;;) {
 517                 c= *header;
 518                 if (!(  ((c >= 'A') && (c <= 'Z')) || (c == '-') ||
 519                     ((c >= '0') && (c <= '9'))))
 520                         break;
 521                 header++;
 522         }
 523         *header = '\0';
 524         cipher->cipher = enc = EVP_get_cipherbyname(p);
 525         *header = c;
 526         header++;
 527
 528         if (enc == NULL) {
 529                 PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION);
 530                 return (0);
 531         }
 532         if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
 533                 return (0);
 534
 535         return (1);
 536 }
 537
 538 static int
 539 load_iv(char **fromp, unsigned char *to, int num)
 540 {
 541         int v, i;
 542         char *from;
 543
 544         from= *fromp;
 545         for (i = 0; i < num; i++)
 546                 to[i] = 0;
 547         num *= 2;
 548         for (i = 0; i < num; i++) {
 549                 if ((*from >= '0') && (*from <= '9'))
 550                         v = *from - '0';
 551                 else if ((*from >= 'A') && (*from <= 'F'))
 552                         v = *from - 'A' + 10;
 553                 else if ((*from >= 'a') && (*from <= 'f'))
 554                         v = *from - 'a' + 10;
 555                 else {
 556                         PEMerror(PEM_R_BAD_IV_CHARS);
 557                         return (0);
 558                 }
 559                 from++;
 560                 to[i / 2] |= v << (long)((!(i & 1)) * 4);
 561         }
 562
 563         *fromp = from;
 564         return (1);
 565 }
 566
 567 int
 568 PEM_write(FILE *fp, char *name, char *header, 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, char *header, unsigned char *data,
 585     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                 EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
 617                 if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 618                         goto err;
 619                 i += outl;
 620                 len -= n;
 621                 j += n;
 622         }
 623         EVP_EncodeFinal(&ctx, buf, &outl);
 624         if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 625                 goto err;
 626         freezero(buf, PEM_BUFSIZE * 8);
 627         buf = NULL;
 628         if ((BIO_write(bp, "-----END ", 9) != 9) ||
 629             (BIO_write(bp, name, nlen) != nlen) ||
 630             (BIO_write(bp, "-----\n", 6) != 6))
 631                 goto err;
 632         return (i + outl);
 633
 634 err:
 635         freezero(buf, PEM_BUFSIZE * 8);
 636         PEMerror(reason);
 637         return (0);
 638 }
 639
 640 int
 641 PEM_read(FILE *fp, char **name, char **header, unsigned char **data, long *len)
 642 {
 643         BIO *b;
 644         int ret;
 645
 646         if ((b = BIO_new(BIO_s_file())) == NULL) {
 647                 PEMerror(ERR_R_BUF_LIB);
 648                 return (0);
 649         }
 650         BIO_set_fp(b, fp, BIO_NOCLOSE);
 651         ret = PEM_read_bio(b, name, header, data, len);
 652         BIO_free(b);
 653         return (ret);
 654 }
 655
 656 int
 657 PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 658     long *len)
 659 {
 660         EVP_ENCODE_CTX ctx;
 661         int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 662         char buf[256];
 663         BUF_MEM *nameB;
 664         BUF_MEM *headerB;
 665         BUF_MEM *dataB, *tmpB;
 666
 667         nameB = BUF_MEM_new();
 668         headerB = BUF_MEM_new();
 669         dataB = BUF_MEM_new();
 670         if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
 671                 BUF_MEM_free(nameB);
 672                 BUF_MEM_free(headerB);
 673                 BUF_MEM_free(dataB);
 674                 PEMerror(ERR_R_MALLOC_FAILURE);
 675                 return (0);
 676         }
 677
 678         buf[254] = '\0';
 679         for (;;) {
 680                 i = BIO_gets(bp, buf, 254);
 681
 682                 if (i <= 0) {
 683                         PEMerror(PEM_R_NO_START_LINE);
 684                         goto err;
 685                 }
 686
 687                 while ((i >= 0) && (buf[i] <= ' '))
 688                         i--;
 689                 buf[++i] = '\n';
 690                 buf[++i] = '\0';
 691
 692                 if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 693                         i = strlen(&(buf[11]));
 694
 695                         if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 696                                 continue;
 697                         if (!BUF_MEM_grow(nameB, i + 9)) {
 698                                 PEMerror(ERR_R_MALLOC_FAILURE);
 699                                 goto err;
 700                         }
 701                         memcpy(nameB->data, &(buf[11]), i - 6);
 702                         nameB->data[i - 6] = '\0';
 703                         break;
 704                 }
 705         }
 706         hl = 0;
 707         if (!BUF_MEM_grow(headerB, 256)) {
 708                 PEMerror(ERR_R_MALLOC_FAILURE);
 709                 goto err;
 710         }
 711         headerB->data[0] = '\0';
 712         for (;;) {
 713                 i = BIO_gets(bp, buf, 254);
 714                 if (i <= 0)
 715                         break;
 716
 717                 while ((i >= 0) && (buf[i] <= ' '))
 718                         i--;
 719                 buf[++i] = '\n';
 720                 buf[++i] = '\0';
 721
 722                 if (buf[0] == '\n')
 723                         break;
 724                 if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 725                         PEMerror(ERR_R_MALLOC_FAILURE);
 726                         goto err;
 727                 }
 728                 if (strncmp(buf, "-----END ", 9) == 0) {
 729                         nohead = 1;
 730                         break;
 731                 }
 732                 memcpy(&(headerB->data[hl]), buf, i);
 733                 headerB->data[hl + i] = '\0';
 734                 hl += i;
 735         }
 736
 737         bl = 0;
 738         if (!BUF_MEM_grow(dataB, 1024)) {
 739                 PEMerror(ERR_R_MALLOC_FAILURE);
 740                 goto err;
 741         }
 742         dataB->data[0] = '\0';
 743         if (!nohead) {
 744                 for (;;) {
 745                         i = BIO_gets(bp, buf, 254);
 746                         if (i <= 0)
 747                                 break;
 748
 749                         while ((i >= 0) && (buf[i] <= ' '))
 750                                 i--;
 751                         buf[++i] = '\n';
 752                         buf[++i] = '\0';
 753
 754                         if (i != 65)
 755                                 end = 1;
 756                         if (strncmp(buf, "-----END ", 9) == 0)
 757                                 break;
 758                         if (i > 65)
 759                                 break;
 760                         if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 761                                 PEMerror(ERR_R_MALLOC_FAILURE);
 762                                 goto err;
 763                         }
 764                         memcpy(&(dataB->data[bl]), buf, i);
 765                         dataB->data[bl + i] = '\0';
 766                         bl += i;
 767                         if (end) {
 768                                 buf[0] = '\0';
 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                                 break;
 779                         }
 780                 }
 781         } else {
 782                 tmpB = headerB;
 783                 headerB = dataB;
 784                 dataB = tmpB;
 785                 bl = hl;
 786         }
 787         i = strlen(nameB->data);
 788         if ((strncmp(buf, "-----END ", 9) != 0) ||
 789             (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 790             (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 791                 PEMerror(PEM_R_BAD_END_LINE);
 792                 goto err;
 793         }
 794
 795         EVP_DecodeInit(&ctx);
 796         i = EVP_DecodeUpdate(&ctx,
 797             (unsigned char *)dataB->data, &bl,
 798             (unsigned char *)dataB->data, bl);
 799         if (i < 0) {
 800                 PEMerror(PEM_R_BAD_BASE64_DECODE);
 801                 goto err;
 802         }
 803         i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
 804         if (i < 0) {
 805                 PEMerror(PEM_R_BAD_BASE64_DECODE);
 806                 goto err;
 807         }
 808         bl += k;
 809
 810         if (bl == 0)
 811                 goto err;
 812         *name = nameB->data;
 813         *header = headerB->data;
 814         *data = (unsigned char *)dataB->data;
 815         *len = bl;
 816         free(nameB);
 817         free(headerB);
 818         free(dataB);
 819         return (1);
 820
 821 err:
 822         BUF_MEM_free(nameB);
 823         BUF_MEM_free(headerB);
 824         BUF_MEM_free(dataB);
 825         return (0);
 826 }
 827
 828 /* Check pem string and return prefix length.
 829  * If for example the pem_str == "RSA PRIVATE KEY" and suffix = "PRIVATE KEY"
 830  * the return value is 3 for the string "RSA".
 831  */
 832
 833 int
 834 pem_check_suffix(const char *pem_str, const char *suffix)
 835 {
 836         int pem_len = strlen(pem_str);
 837         int suffix_len = strlen(suffix);
 838         const char *p;
 839
 840         if (suffix_len + 1 >= pem_len)
 841                 return 0;
 842         p = pem_str + pem_len - suffix_len;
 843         if (strcmp(p, suffix))
 844                 return 0;
 845         p--;
 846         if (*p != ' ')
 847                 return 0;
 848         return p - pem_str;
 849 }