crypto/pem/pem_lib.c

   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 "internal/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 "internal/asn1_int.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 #define MIN_LENGTH      4
  78
  79 static int load_iv(char **fromp, unsigned char *to, int num);
  80 static int check_pem(const char *nm, const char *name);
  81 int pem_check_suffix(const char *pem_str, const char *suffix);
  82
  83 int PEM_def_callback(char *buf, int num, int w, void *key)
  84 {
  85 #ifdef OPENSSL_NO_STDIO
  86     /*
  87      * We should not ever call the default callback routine from windows.
  88      */
  89     PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  90     return (-1);
  91 #else
  92     int i, j;
  93     const char *prompt;
  94     if (key) {
  95         i = strlen(key);
  96         i = (i > num) ? num : i;
  97         memcpy(buf, key, i);
  98         return (i);
  99     }
 100
 101     prompt = EVP_get_pw_prompt();
 102     if (prompt == NULL)
 103         prompt = "Enter PEM pass phrase:";
 104
 105     for (;;) {
 106         i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
 107         if (i != 0) {
 108             PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
 109             memset(buf, 0, (unsigned int)num);
 110             return (-1);
 111         }
 112         j = strlen(buf);
 113         if (j < MIN_LENGTH) {
 114             fprintf(stderr,
 115                     "phrase is too short, needs to be at least %d chars\n",
 116                     MIN_LENGTH);
 117         } else
 118             break;
 119     }
 120     return (j);
 121 #endif
 122 }
 123
 124 void PEM_proc_type(char *buf, int type)
 125 {
 126     const char *str;
 127
 128     if (type == PEM_TYPE_ENCRYPTED)
 129         str = "ENCRYPTED";
 130     else if (type == PEM_TYPE_MIC_CLEAR)
 131         str = "MIC-CLEAR";
 132     else if (type == PEM_TYPE_MIC_ONLY)
 133         str = "MIC-ONLY";
 134     else
 135         str = "BAD-TYPE";
 136
 137     OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
 138     OPENSSL_strlcat(buf, str, PEM_BUFSIZE);
 139     OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE);
 140 }
 141
 142 void PEM_dek_info(char *buf, const char *type, int len, char *str)
 143 {
 144     static const unsigned char map[17] = "0123456789ABCDEF";
 145     long i;
 146     int j;
 147
 148     OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
 149     OPENSSL_strlcat(buf, type, PEM_BUFSIZE);
 150     OPENSSL_strlcat(buf, ",", PEM_BUFSIZE);
 151     j = strlen(buf);
 152     if (j + (len * 2) + 1 > PEM_BUFSIZE)
 153         return;
 154     for (i = 0; i < len; i++) {
 155         buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
 156         buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
 157     }
 158     buf[j + i * 2] = '\n';
 159     buf[j + i * 2 + 1] = '\0';
 160 }
 161
 162 #ifndef OPENSSL_NO_STDIO
 163 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
 164                     pem_password_cb *cb, void *u)
 165 {
 166     BIO *b;
 167     void *ret;
 168
 169     if ((b = BIO_new(BIO_s_file())) == NULL) {
 170         PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
 171         return (0);
 172     }
 173     BIO_set_fp(b, fp, BIO_NOCLOSE);
 174     ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
 175     BIO_free(b);
 176     return (ret);
 177 }
 178 #endif
 179
 180 static int check_pem(const char *nm, const char *name)
 181 {
 182     /* Normal matching nm and name */
 183     if (strcmp(nm, name) == 0)
 184         return 1;
 185
 186     /* Make PEM_STRING_EVP_PKEY match any private key */
 187
 188     if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
 189         int slen;
 190         const EVP_PKEY_ASN1_METHOD *ameth;
 191         if (strcmp(nm, PEM_STRING_PKCS8) == 0)
 192             return 1;
 193         if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
 194             return 1;
 195         slen = pem_check_suffix(nm, "PRIVATE KEY");
 196         if (slen > 0) {
 197             /*
 198              * NB: ENGINE implementations wont contain a deprecated old
 199              * private key decode function so don't look for them.
 200              */
 201             ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
 202             if (ameth && ameth->old_priv_decode)
 203                 return 1;
 204         }
 205         return 0;
 206     }
 207
 208     if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
 209         int slen;
 210         const EVP_PKEY_ASN1_METHOD *ameth;
 211         slen = pem_check_suffix(nm, "PARAMETERS");
 212         if (slen > 0) {
 213             ENGINE *e;
 214             ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
 215             if (ameth) {
 216                 int r;
 217                 if (ameth->param_decode)
 218                     r = 1;
 219                 else
 220                     r = 0;
 221 #ifndef OPENSSL_NO_ENGINE
 222                 if (e)
 223                     ENGINE_finish(e);
 224 #endif
 225                 return r;
 226             }
 227         }
 228         return 0;
 229     }
 230     /* If reading DH parameters handle X9.42 DH format too */
 231     if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
 232         && strcmp(name, PEM_STRING_DHPARAMS) == 0)
 233         return 1;
 234
 235     /* Permit older strings */
 236
 237     if (strcmp(nm, PEM_STRING_X509_OLD) == 0
 238         && strcmp(name, PEM_STRING_X509) == 0)
 239         return 1;
 240
 241     if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
 242         && strcmp(name, PEM_STRING_X509_REQ) == 0)
 243         return 1;
 244
 245     /* Allow normal certs to be read as trusted certs */
 246     if (strcmp(nm, PEM_STRING_X509) == 0
 247         && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
 248         return 1;
 249
 250     if (strcmp(nm, PEM_STRING_X509_OLD) == 0
 251         && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
 252         return 1;
 253
 254     /* Some CAs use PKCS#7 with CERTIFICATE headers */
 255     if (strcmp(nm, PEM_STRING_X509) == 0
 256         && strcmp(name, PEM_STRING_PKCS7) == 0)
 257         return 1;
 258
 259     if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
 260         && strcmp(name, PEM_STRING_PKCS7) == 0)
 261         return 1;
 262
 263 #ifndef OPENSSL_NO_CMS
 264     if (strcmp(nm, PEM_STRING_X509) == 0
 265         && strcmp(name, PEM_STRING_CMS) == 0)
 266         return 1;
 267     /* Allow CMS to be read from PKCS#7 headers */
 268     if (strcmp(nm, PEM_STRING_PKCS7) == 0
 269         && strcmp(name, PEM_STRING_CMS) == 0)
 270         return 1;
 271 #endif
 272
 273     return 0;
 274 }
 275
 276 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
 277                        const char *name, BIO *bp, pem_password_cb *cb,
 278                        void *u)
 279 {
 280     EVP_CIPHER_INFO cipher;
 281     char *nm = NULL, *header = NULL;
 282     unsigned char *data = NULL;
 283     long len;
 284     int ret = 0;
 285
 286     for (;;) {
 287         if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {
 288             if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
 289                 ERR_add_error_data(2, "Expecting: ", name);
 290             return 0;
 291         }
 292         if (check_pem(nm, name))
 293             break;
 294         OPENSSL_free(nm);
 295         OPENSSL_free(header);
 296         OPENSSL_free(data);
 297     }
 298     if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 299         goto err;
 300     if (!PEM_do_header(&cipher, data, &len, cb, u))
 301         goto err;
 302
 303     *pdata = data;
 304     *plen = len;
 305
 306     if (pnm)
 307         *pnm = nm;
 308
 309     ret = 1;
 310
 311  err:
 312     if (!ret || !pnm)
 313         OPENSSL_free(nm);
 314     OPENSSL_free(header);
 315     if (!ret)
 316         OPENSSL_free(data);
 317     return ret;
 318 }
 319
 320 #ifndef OPENSSL_NO_STDIO
 321 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
 322                    void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 323                    int klen, pem_password_cb *callback, void *u)
 324 {
 325     BIO *b;
 326     int ret;
 327
 328     if ((b = BIO_new(BIO_s_file())) == NULL) {
 329         PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
 330         return (0);
 331     }
 332     BIO_set_fp(b, fp, BIO_NOCLOSE);
 333     ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
 334     BIO_free(b);
 335     return (ret);
 336 }
 337 #endif
 338
 339 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
 340                        void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 341                        int klen, pem_password_cb *callback, void *u)
 342 {
 343     EVP_CIPHER_CTX ctx;
 344     int dsize = 0, i = 0, j = 0, ret = 0;
 345     unsigned char *p, *data = NULL;
 346     const char *objstr = NULL;
 347     char buf[PEM_BUFSIZE];
 348     unsigned char key[EVP_MAX_KEY_LENGTH];
 349     unsigned char iv[EVP_MAX_IV_LENGTH];
 350
 351     if (enc != NULL) {
 352         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 353         if (objstr == NULL) {
 354             PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 355             goto err;
 356         }
 357     }
 358
 359     if ((dsize = i2d(x, NULL)) < 0) {
 360         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
 361         dsize = 0;
 362         goto err;
 363     }
 364     /* dzise + 8 bytes are needed */
 365     /* actually it needs the cipher block size extra... */
 366     data = OPENSSL_malloc((unsigned int)dsize + 20);
 367     if (data == NULL) {
 368         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
 369         goto err;
 370     }
 371     p = data;
 372     i = i2d(x, &p);
 373
 374     if (enc != NULL) {
 375         if (kstr == NULL) {
 376             if (callback == NULL)
 377                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
 378             else
 379                 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
 380             if (klen <= 0) {
 381                 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
 382                 goto err;
 383             }
 384 #ifdef CHARSET_EBCDIC
 385             /* Convert the pass phrase from EBCDIC */
 386             ebcdic2ascii(buf, buf, klen);
 387 #endif
 388             kstr = (unsigned char *)buf;
 389         }
 390         RAND_add(data, i, 0);   /* put in the RSA key. */
 391         OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
 392         if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */
 393             goto err;
 394         /*
 395          * The 'iv' is used as the iv and as a salt.  It is NOT taken from
 396          * the BytesToKey function
 397          */
 398         if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
 399             goto err;
 400
 401         if (kstr == (unsigned char *)buf)
 402             OPENSSL_cleanse(buf, PEM_BUFSIZE);
 403
 404         OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
 405                        sizeof buf);
 406
 407         buf[0] = '\0';
 408         PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 409         PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);
 410         /* k=strlen(buf); */
 411
 412         EVP_CIPHER_CTX_init(&ctx);
 413         ret = 1;
 414         if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv)
 415             || !EVP_EncryptUpdate(&ctx, data, &j, data, i)
 416             || !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))
 417             ret = 0;
 418         EVP_CIPHER_CTX_cleanup(&ctx);
 419         if (ret == 0)
 420             goto err;
 421         i += j;
 422     } else {
 423         ret = 1;
 424         buf[0] = '\0';
 425     }
 426     i = PEM_write_bio(bp, name, buf, data, i);
 427     if (i <= 0)
 428         ret = 0;
 429  err:
 430     OPENSSL_cleanse(key, sizeof(key));
 431     OPENSSL_cleanse(iv, sizeof(iv));
 432     OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
 433     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 434     OPENSSL_clear_free(data, (unsigned int)dsize);
 435     return (ret);
 436 }
 437
 438 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 439                   pem_password_cb *callback, void *u)
 440 {
 441     int i = 0, j, o, klen;
 442     long len;
 443     EVP_CIPHER_CTX ctx;
 444     unsigned char key[EVP_MAX_KEY_LENGTH];
 445     char buf[PEM_BUFSIZE];
 446
 447     len = *plen;
 448
 449     if (cipher->cipher == NULL)
 450         return (1);
 451     if (callback == NULL)
 452         klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 453     else
 454         klen = callback(buf, PEM_BUFSIZE, 0, u);
 455     if (klen <= 0) {
 456         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
 457         return (0);
 458     }
 459 #ifdef CHARSET_EBCDIC
 460     /* Convert the pass phrase from EBCDIC */
 461     ebcdic2ascii(buf, buf, klen);
 462 #endif
 463
 464     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 465                         (unsigned char *)buf, klen, 1, key, NULL))
 466         return 0;
 467
 468     j = (int)len;
 469     EVP_CIPHER_CTX_init(&ctx);
 470     o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
 471     if (o)
 472         o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
 473     if (o)
 474         o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
 475     EVP_CIPHER_CTX_cleanup(&ctx);
 476     OPENSSL_cleanse((char *)buf, sizeof(buf));
 477     OPENSSL_cleanse((char *)key, sizeof(key));
 478     if (o)
 479         j += i;
 480     else {
 481         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
 482         return (0);
 483     }
 484     *plen = j;
 485     return (1);
 486 }
 487
 488 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 489 {
 490     const EVP_CIPHER *enc = NULL;
 491     char *p, c;
 492     char **header_pp = &header;
 493
 494     cipher->cipher = NULL;
 495     if ((header == NULL) || (*header == '\0') || (*header == '\n'))
 496         return (1);
 497     if (strncmp(header, "Proc-Type: ", 11) != 0) {
 498         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
 499         return (0);
 500     }
 501     header += 11;
 502     if (*header != '4')
 503         return (0);
 504     header++;
 505     if (*header != ',')
 506         return (0);
 507     header++;
 508     if (strncmp(header, "ENCRYPTED", 9) != 0) {
 509         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
 510         return (0);
 511     }
 512     for (; (*header != '\n') && (*header != '\0'); header++) ;
 513     if (*header == '\0') {
 514         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
 515         return (0);
 516     }
 517     header++;
 518     if (strncmp(header, "DEK-Info: ", 10) != 0) {
 519         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
 520         return (0);
 521     }
 522     header += 10;
 523
 524     p = header;
 525     for (;;) {
 526         c = *header;
 527 #ifndef CHARSET_EBCDIC
 528         if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
 529               ((c >= '0') && (c <= '9'))))
 530             break;
 531 #else
 532         if (!(isupper(c) || (c == '-') || isdigit(c)))
 533             break;
 534 #endif
 535         header++;
 536     }
 537     *header = '\0';
 538     cipher->cipher = enc = EVP_get_cipherbyname(p);
 539     *header = c;
 540     header++;
 541
 542     if (enc == NULL) {
 543         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
 544         return (0);
 545     }
 546     if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
 547         return (0);
 548
 549     return (1);
 550 }
 551
 552 static int load_iv(char **fromp, unsigned char *to, int num)
 553 {
 554     int v, i;
 555     char *from;
 556
 557     from = *fromp;
 558     for (i = 0; i < num; i++)
 559         to[i] = 0;
 560     num *= 2;
 561     for (i = 0; i < num; i++) {
 562         if ((*from >= '0') && (*from <= '9'))
 563             v = *from - '0';
 564         else if ((*from >= 'A') && (*from <= 'F'))
 565             v = *from - 'A' + 10;
 566         else if ((*from >= 'a') && (*from <= 'f'))
 567             v = *from - 'a' + 10;
 568         else {
 569             PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
 570             return (0);
 571         }
 572         from++;
 573         to[i / 2] |= v << (long)((!(i & 1)) * 4);
 574     }
 575
 576     *fromp = from;
 577     return (1);
 578 }
 579
 580 #ifndef OPENSSL_NO_STDIO
 581 int PEM_write(FILE *fp, const char *name, const char *header,
 582               const unsigned char *data, long len)
 583 {
 584     BIO *b;
 585     int ret;
 586
 587     if ((b = BIO_new(BIO_s_file())) == NULL) {
 588         PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
 589         return (0);
 590     }
 591     BIO_set_fp(b, fp, BIO_NOCLOSE);
 592     ret = PEM_write_bio(b, name, header, data, len);
 593     BIO_free(b);
 594     return (ret);
 595 }
 596 #endif
 597
 598 int PEM_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 = EVP_ENCODE_CTX_new();
 604     int reason = ERR_R_BUF_LIB;
 605
 606     if (ctx == NULL) {
 607         reason = ERR_R_MALLOC_FAILURE;
 608         goto err;
 609     }
 610
 611     EVP_EncodeInit(ctx);
 612     nlen = strlen(name);
 613
 614     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
 615         (BIO_write(bp, name, nlen) != nlen) ||
 616         (BIO_write(bp, "-----\n", 6) != 6))
 617         goto err;
 618
 619     i = strlen(header);
 620     if (i > 0) {
 621         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
 622             goto err;
 623     }
 624
 625     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
 626     if (buf == NULL) {
 627         reason = ERR_R_MALLOC_FAILURE;
 628         goto err;
 629     }
 630
 631     i = j = 0;
 632     while (len > 0) {
 633         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
 634         EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n);
 635         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 636             goto err;
 637         i += outl;
 638         len -= n;
 639         j += n;
 640     }
 641     EVP_EncodeFinal(ctx, buf, &outl);
 642     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 643         goto err;
 644     if ((BIO_write(bp, "-----END ", 9) != 9) ||
 645         (BIO_write(bp, name, nlen) != nlen) ||
 646         (BIO_write(bp, "-----\n", 6) != 6))
 647         goto err;
 648     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 649     EVP_ENCODE_CTX_free(ctx);
 650     return (i + outl);
 651  err:
 652     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 653     EVP_ENCODE_CTX_free(ctx);
 654     PEMerr(PEM_F_PEM_WRITE_BIO, reason);
 655     return (0);
 656 }
 657
 658 #ifndef OPENSSL_NO_STDIO
 659 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
 660              long *len)
 661 {
 662     BIO *b;
 663     int ret;
 664
 665     if ((b = BIO_new(BIO_s_file())) == NULL) {
 666         PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
 667         return (0);
 668     }
 669     BIO_set_fp(b, fp, BIO_NOCLOSE);
 670     ret = PEM_read_bio(b, name, header, data, len);
 671     BIO_free(b);
 672     return (ret);
 673 }
 674 #endif
 675
 676 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 677                  long *len)
 678 {
 679     EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
 680     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 681     char buf[256];
 682     BUF_MEM *nameB;
 683     BUF_MEM *headerB;
 684     BUF_MEM *dataB, *tmpB;
 685
 686     if (ctx == NULL) {
 687         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 688         return (0);
 689     }
 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         goto err;
 696     }
 697
 698     buf[254] = '\0';
 699     for (;;) {
 700         i = BIO_gets(bp, buf, 254);
 701
 702         if (i <= 0) {
 703             PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
 704             goto err;
 705         }
 706
 707         while ((i >= 0) && (buf[i] <= ' '))
 708             i--;
 709         buf[++i] = '\n';
 710         buf[++i] = '\0';
 711
 712         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 713             i = strlen(&(buf[11]));
 714
 715             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 716                 continue;
 717             if (!BUF_MEM_grow(nameB, i + 9)) {
 718                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 719                 goto err;
 720             }
 721             memcpy(nameB->data, &(buf[11]), i - 6);
 722             nameB->data[i - 6] = '\0';
 723             break;
 724         }
 725     }
 726     hl = 0;
 727     if (!BUF_MEM_grow(headerB, 256)) {
 728         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 729         goto err;
 730     }
 731     headerB->data[0] = '\0';
 732     for (;;) {
 733         i = BIO_gets(bp, buf, 254);
 734         if (i <= 0)
 735             break;
 736
 737         while ((i >= 0) && (buf[i] <= ' '))
 738             i--;
 739         buf[++i] = '\n';
 740         buf[++i] = '\0';
 741
 742         if (buf[0] == '\n')
 743             break;
 744         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 745             PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 746             goto err;
 747         }
 748         if (strncmp(buf, "-----END ", 9) == 0) {
 749             nohead = 1;
 750             break;
 751         }
 752         memcpy(&(headerB->data[hl]), buf, i);
 753         headerB->data[hl + i] = '\0';
 754         hl += i;
 755     }
 756
 757     bl = 0;
 758     if (!BUF_MEM_grow(dataB, 1024)) {
 759         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 760         goto err;
 761     }
 762     dataB->data[0] = '\0';
 763     if (!nohead) {
 764         for (;;) {
 765             i = BIO_gets(bp, buf, 254);
 766             if (i <= 0)
 767                 break;
 768
 769             while ((i >= 0) && (buf[i] <= ' '))
 770                 i--;
 771             buf[++i] = '\n';
 772             buf[++i] = '\0';
 773
 774             if (i != 65)
 775                 end = 1;
 776             if (strncmp(buf, "-----END ", 9) == 0)
 777                 break;
 778             if (i > 65)
 779                 break;
 780             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 781                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 782                 goto err;
 783             }
 784             memcpy(&(dataB->data[bl]), buf, i);
 785             dataB->data[bl + i] = '\0';
 786             bl += i;
 787             if (end) {
 788                 buf[0] = '\0';
 789                 i = BIO_gets(bp, buf, 254);
 790                 if (i <= 0)
 791                     break;
 792
 793                 while ((i >= 0) && (buf[i] <= ' '))
 794                     i--;
 795                 buf[++i] = '\n';
 796                 buf[++i] = '\0';
 797
 798                 break;
 799             }
 800         }
 801     } else {
 802         tmpB = headerB;
 803         headerB = dataB;
 804         dataB = tmpB;
 805         bl = hl;
 806     }
 807     i = strlen(nameB->data);
 808     if ((strncmp(buf, "-----END ", 9) != 0) ||
 809         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 810         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 811         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
 812         goto err;
 813     }
 814
 815     EVP_DecodeInit(ctx);
 816     i = EVP_DecodeUpdate(ctx,
 817                          (unsigned char *)dataB->data, &bl,
 818                          (unsigned char *)dataB->data, bl);
 819     if (i < 0) {
 820         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 821         goto err;
 822     }
 823     i = EVP_DecodeFinal(ctx, (unsigned char *)&(dataB->data[bl]), &k);
 824     if (i < 0) {
 825         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 826         goto err;
 827     }
 828     bl += k;
 829
 830     if (bl == 0)
 831         goto err;
 832     *name = nameB->data;
 833     *header = headerB->data;
 834     *data = (unsigned char *)dataB->data;
 835     *len = bl;
 836     OPENSSL_free(nameB);
 837     OPENSSL_free(headerB);
 838     OPENSSL_free(dataB);
 839     EVP_ENCODE_CTX_free(ctx);
 840     return (1);
 841  err:
 842     BUF_MEM_free(nameB);
 843     BUF_MEM_free(headerB);
 844     BUF_MEM_free(dataB);
 845     EVP_ENCODE_CTX_free(ctx);
 846     return (0);
 847 }
 848
 849 /*
 850  * Check pem string and return prefix length. If for example the pem_str ==
 851  * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
 852  * string "RSA".
 853  */
 854
 855 int pem_check_suffix(const char *pem_str, const char *suffix)
 856 {
 857     int pem_len = strlen(pem_str);
 858     int suffix_len = strlen(suffix);
 859     const char *p;
 860     if (suffix_len + 1 >= pem_len)
 861         return 0;
 862     p = pem_str + pem_len - suffix_len;
 863     if (strcmp(p, suffix))
 864         return 0;
 865     p--;
 866     if (*p != ' ')
 867         return 0;
 868     return p - pem_str;
 869 }