crypto/pem/pem_lib.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <ctype.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/rand.h>
  65 #include <openssl/x509.h>
  66 #include <openssl/pem.h>
  67 #include <openssl/pkcs12.h>
  68 #include "internal/asn1_int.h"
  69 #include <openssl/des.h>
  70 #include <openssl/engine.h>
  71
  72 #define MIN_LENGTH      4
  73
  74 static int load_iv(char **fromp, unsigned char *to, int num);
  75 static int check_pem(const char *nm, const char *name);
  76 int pem_check_suffix(const char *pem_str, const char *suffix);
  77
  78 int PEM_def_callback(char *buf, int num, int w, void *key)
  79 {
  80 #if defined(OPENSSL_NO_STDIO) || defined(OPENSSL_NO_UI)
  81     /*
  82      * We should not ever call the default callback routine from windows.
  83      */
  84     PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  85     return (-1);
  86 #else
  87     int i, j;
  88     const char *prompt;
  89     if (key) {
  90         i = strlen(key);
  91         i = (i > num) ? num : i;
  92         memcpy(buf, key, i);
  93         return (i);
  94     }
  95
  96     prompt = EVP_get_pw_prompt();
  97     if (prompt == NULL)
  98         prompt = "Enter PEM pass phrase:";
  99
 100     for (;;) {
 101         /*
 102          * We assume that w == 0 means decryption,
 103          * while w == 1 means encryption
 104          */
 105         int min_len = w ? MIN_LENGTH : 0;
 106
 107         i = EVP_read_pw_string_min(buf, min_len, num, prompt, w);
 108         if (i != 0) {
 109             PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
 110             memset(buf, 0, (unsigned int)num);
 111             return (-1);
 112         }
 113         j = strlen(buf);
 114         if (min_len && j < min_len) {
 115             fprintf(stderr,
 116                     "phrase is too short, needs to be at least %d chars\n",
 117                     min_len);
 118         } else
 119             break;
 120     }
 121     return (j);
 122 #endif
 123 }
 124
 125 void PEM_proc_type(char *buf, int type)
 126 {
 127     const char *str;
 128
 129     if (type == PEM_TYPE_ENCRYPTED)
 130         str = "ENCRYPTED";
 131     else if (type == PEM_TYPE_MIC_CLEAR)
 132         str = "MIC-CLEAR";
 133     else if (type == PEM_TYPE_MIC_ONLY)
 134         str = "MIC-ONLY";
 135     else
 136         str = "BAD-TYPE";
 137
 138     OPENSSL_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
 139     OPENSSL_strlcat(buf, str, PEM_BUFSIZE);
 140     OPENSSL_strlcat(buf, "\n", PEM_BUFSIZE);
 141 }
 142
 143 void PEM_dek_info(char *buf, const char *type, int len, char *str)
 144 {
 145     static const unsigned char map[17] = "0123456789ABCDEF";
 146     long i;
 147     int j;
 148
 149     OPENSSL_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
 150     OPENSSL_strlcat(buf, type, PEM_BUFSIZE);
 151     OPENSSL_strlcat(buf, ",", PEM_BUFSIZE);
 152     j = strlen(buf);
 153     if (j + (len * 2) + 1 > PEM_BUFSIZE)
 154         return;
 155     for (i = 0; i < len; i++) {
 156         buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
 157         buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
 158     }
 159     buf[j + i * 2] = '\n';
 160     buf[j + i * 2 + 1] = '\0';
 161 }
 162
 163 #ifndef OPENSSL_NO_STDIO
 164 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
 165                     pem_password_cb *cb, void *u)
 166 {
 167     BIO *b;
 168     void *ret;
 169
 170     if ((b = BIO_new(BIO_s_file())) == NULL) {
 171         PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
 172         return (0);
 173     }
 174     BIO_set_fp(b, fp, BIO_NOCLOSE);
 175     ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
 176     BIO_free(b);
 177     return (ret);
 178 }
 179 #endif
 180
 181 static int check_pem(const char *nm, const char *name)
 182 {
 183     /* Normal matching nm and name */
 184     if (strcmp(nm, name) == 0)
 185         return 1;
 186
 187     /* Make PEM_STRING_EVP_PKEY match any private key */
 188
 189     if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
 190         int slen;
 191         const EVP_PKEY_ASN1_METHOD *ameth;
 192         if (strcmp(nm, PEM_STRING_PKCS8) == 0)
 193             return 1;
 194         if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
 195             return 1;
 196         slen = pem_check_suffix(nm, "PRIVATE KEY");
 197         if (slen > 0) {
 198             /*
 199              * NB: ENGINE implementations wont contain a deprecated old
 200              * private key decode function so don't look for them.
 201              */
 202             ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
 203             if (ameth && ameth->old_priv_decode)
 204                 return 1;
 205         }
 206         return 0;
 207     }
 208
 209     if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
 210         int slen;
 211         const EVP_PKEY_ASN1_METHOD *ameth;
 212         slen = pem_check_suffix(nm, "PARAMETERS");
 213         if (slen > 0) {
 214             ENGINE *e;
 215             ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
 216             if (ameth) {
 217                 int r;
 218                 if (ameth->param_decode)
 219                     r = 1;
 220                 else
 221                     r = 0;
 222 #ifndef OPENSSL_NO_ENGINE
 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 = NULL;
 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 || EVP_CIPHER_iv_length(enc) == 0) {
 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(EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv));
 392         if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 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 * EVP_CIPHER_iv_length(enc) + 13
 405                        <= sizeof buf);
 406
 407         buf[0] = '\0';
 408         PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
 409         PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv);
 410         /* k=strlen(buf); */
 411
 412         ret = 1;
 413         if ((ctx = EVP_CIPHER_CTX_new()) == NULL
 414             || !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         if (ret == 0)
 419             goto err;
 420         i += j;
 421     } else {
 422         ret = 1;
 423         buf[0] = '\0';
 424     }
 425     i = PEM_write_bio(bp, name, buf, data, i);
 426     if (i <= 0)
 427         ret = 0;
 428  err:
 429     OPENSSL_cleanse(key, sizeof(key));
 430     OPENSSL_cleanse(iv, sizeof(iv));
 431     EVP_CIPHER_CTX_free(ctx);
 432     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 433     OPENSSL_clear_free(data, (unsigned int)dsize);
 434     return (ret);
 435 }
 436
 437 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 438                   pem_password_cb *callback, void *u)
 439 {
 440     int i = 0, j, o, klen;
 441     long len;
 442     EVP_CIPHER_CTX *ctx;
 443     unsigned char key[EVP_MAX_KEY_LENGTH];
 444     char buf[PEM_BUFSIZE];
 445
 446     len = *plen;
 447
 448     if (cipher->cipher == NULL)
 449         return (1);
 450     if (callback == NULL)
 451         klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 452     else
 453         klen = callback(buf, PEM_BUFSIZE, 0, u);
 454     if (klen <= 0) {
 455         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
 456         return (0);
 457     }
 458 #ifdef CHARSET_EBCDIC
 459     /* Convert the pass phrase from EBCDIC */
 460     ebcdic2ascii(buf, buf, klen);
 461 #endif
 462
 463     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 464                         (unsigned char *)buf, klen, 1, key, NULL))
 465         return 0;
 466
 467     j = (int)len;
 468     ctx = EVP_CIPHER_CTX_new();
 469     if (ctx == NULL)
 470         return 0;
 471     o = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
 472     if (o)
 473         o = EVP_DecryptUpdate(ctx, data, &i, data, j);
 474     if (o)
 475         o = EVP_DecryptFinal_ex(ctx, &(data[i]), &j);
 476     EVP_CIPHER_CTX_free(ctx);
 477     OPENSSL_cleanse((char *)buf, sizeof(buf));
 478     OPENSSL_cleanse((char *)key, sizeof(key));
 479     if (o)
 480         j += i;
 481     else {
 482         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
 483         return (0);
 484     }
 485     *plen = j;
 486     return (1);
 487 }
 488
 489 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 490 {
 491     const EVP_CIPHER *enc = NULL;
 492     char *dekinfostart, c;
 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     dekinfostart = 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(dekinfostart);
 539     *header++ = c;
 540
 541     if (enc == NULL) {
 542         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
 543         return (0);
 544     }
 545     if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc)))
 546         return (0);
 547
 548     return (1);
 549 }
 550
 551 static int load_iv(char **fromp, unsigned char *to, int num)
 552 {
 553     int v, i;
 554     char *from;
 555
 556     from = *fromp;
 557     for (i = 0; i < num; i++)
 558         to[i] = 0;
 559     num *= 2;
 560     for (i = 0; i < num; i++) {
 561         if ((*from >= '0') && (*from <= '9'))
 562             v = *from - '0';
 563         else if ((*from >= 'A') && (*from <= 'F'))
 564             v = *from - 'A' + 10;
 565         else if ((*from >= 'a') && (*from <= 'f'))
 566             v = *from - 'a' + 10;
 567         else {
 568             PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
 569             return (0);
 570         }
 571         from++;
 572         to[i / 2] |= v << (long)((!(i & 1)) * 4);
 573     }
 574
 575     *fromp = from;
 576     return (1);
 577 }
 578
 579 #ifndef OPENSSL_NO_STDIO
 580 int PEM_write(FILE *fp, const char *name, const char *header,
 581               const unsigned char *data, long len)
 582 {
 583     BIO *b;
 584     int ret;
 585
 586     if ((b = BIO_new(BIO_s_file())) == NULL) {
 587         PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
 588         return (0);
 589     }
 590     BIO_set_fp(b, fp, BIO_NOCLOSE);
 591     ret = PEM_write_bio(b, name, header, data, len);
 592     BIO_free(b);
 593     return (ret);
 594 }
 595 #endif
 596
 597 int PEM_write_bio(BIO *bp, const char *name, const char *header,
 598                   const unsigned char *data, long len)
 599 {
 600     int nlen, n, i, j, outl;
 601     unsigned char *buf = NULL;
 602     EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
 603     int reason = ERR_R_BUF_LIB;
 604
 605     if (ctx == NULL) {
 606         reason = ERR_R_MALLOC_FAILURE;
 607         goto err;
 608     }
 609
 610     EVP_EncodeInit(ctx);
 611     nlen = strlen(name);
 612
 613     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
 614         (BIO_write(bp, name, nlen) != nlen) ||
 615         (BIO_write(bp, "-----\n", 6) != 6))
 616         goto err;
 617
 618     i = strlen(header);
 619     if (i > 0) {
 620         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
 621             goto err;
 622     }
 623
 624     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
 625     if (buf == NULL) {
 626         reason = ERR_R_MALLOC_FAILURE;
 627         goto err;
 628     }
 629
 630     i = j = 0;
 631     while (len > 0) {
 632         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
 633         EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n);
 634         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 635             goto err;
 636         i += outl;
 637         len -= n;
 638         j += n;
 639     }
 640     EVP_EncodeFinal(ctx, buf, &outl);
 641     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 642         goto err;
 643     if ((BIO_write(bp, "-----END ", 9) != 9) ||
 644         (BIO_write(bp, name, nlen) != nlen) ||
 645         (BIO_write(bp, "-----\n", 6) != 6))
 646         goto err;
 647     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 648     EVP_ENCODE_CTX_free(ctx);
 649     return (i + outl);
 650  err:
 651     OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
 652     EVP_ENCODE_CTX_free(ctx);
 653     PEMerr(PEM_F_PEM_WRITE_BIO, reason);
 654     return (0);
 655 }
 656
 657 #ifndef OPENSSL_NO_STDIO
 658 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
 659              long *len)
 660 {
 661     BIO *b;
 662     int ret;
 663
 664     if ((b = BIO_new(BIO_s_file())) == NULL) {
 665         PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
 666         return (0);
 667     }
 668     BIO_set_fp(b, fp, BIO_NOCLOSE);
 669     ret = PEM_read_bio(b, name, header, data, len);
 670     BIO_free(b);
 671     return (ret);
 672 }
 673 #endif
 674
 675 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 676                  long *len)
 677 {
 678     EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
 679     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 680     char buf[256];
 681     BUF_MEM *nameB;
 682     BUF_MEM *headerB;
 683     BUF_MEM *dataB, *tmpB;
 684
 685     if (ctx == NULL) {
 686         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 687         return (0);
 688     }
 689
 690     nameB = BUF_MEM_new();
 691     headerB = BUF_MEM_new();
 692     dataB = BUF_MEM_new();
 693     if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
 694         goto err;
 695     }
 696
 697     buf[254] = '\0';
 698     for (;;) {
 699         i = BIO_gets(bp, buf, 254);
 700
 701         if (i <= 0) {
 702             PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
 703             goto err;
 704         }
 705
 706         while ((i >= 0) && (buf[i] <= ' '))
 707             i--;
 708         buf[++i] = '\n';
 709         buf[++i] = '\0';
 710
 711         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 712             i = strlen(&(buf[11]));
 713
 714             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 715                 continue;
 716             if (!BUF_MEM_grow(nameB, i + 9)) {
 717                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 718                 goto err;
 719             }
 720             memcpy(nameB->data, &(buf[11]), i - 6);
 721             nameB->data[i - 6] = '\0';
 722             break;
 723         }
 724     }
 725     hl = 0;
 726     if (!BUF_MEM_grow(headerB, 256)) {
 727         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 728         goto err;
 729     }
 730     headerB->data[0] = '\0';
 731     for (;;) {
 732         i = BIO_gets(bp, buf, 254);
 733         if (i <= 0)
 734             break;
 735
 736         while ((i >= 0) && (buf[i] <= ' '))
 737             i--;
 738         buf[++i] = '\n';
 739         buf[++i] = '\0';
 740
 741         if (buf[0] == '\n')
 742             break;
 743         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 744             PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 745             goto err;
 746         }
 747         if (strncmp(buf, "-----END ", 9) == 0) {
 748             nohead = 1;
 749             break;
 750         }
 751         memcpy(&(headerB->data[hl]), buf, i);
 752         headerB->data[hl + i] = '\0';
 753         hl += i;
 754     }
 755
 756     bl = 0;
 757     if (!BUF_MEM_grow(dataB, 1024)) {
 758         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 759         goto err;
 760     }
 761     dataB->data[0] = '\0';
 762     if (!nohead) {
 763         for (;;) {
 764             i = BIO_gets(bp, buf, 254);
 765             if (i <= 0)
 766                 break;
 767
 768             while ((i >= 0) && (buf[i] <= ' '))
 769                 i--;
 770             buf[++i] = '\n';
 771             buf[++i] = '\0';
 772
 773             if (i != 65)
 774                 end = 1;
 775             if (strncmp(buf, "-----END ", 9) == 0)
 776                 break;
 777             if (i > 65)
 778                 break;
 779             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 780                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 781                 goto err;
 782             }
 783             memcpy(&(dataB->data[bl]), buf, i);
 784             dataB->data[bl + i] = '\0';
 785             bl += i;
 786             if (end) {
 787                 buf[0] = '\0';
 788                 i = BIO_gets(bp, buf, 254);
 789                 if (i <= 0)
 790                     break;
 791
 792                 while ((i >= 0) && (buf[i] <= ' '))
 793                     i--;
 794                 buf[++i] = '\n';
 795                 buf[++i] = '\0';
 796
 797                 break;
 798             }
 799         }
 800     } else {
 801         tmpB = headerB;
 802         headerB = dataB;
 803         dataB = tmpB;
 804         bl = hl;
 805     }
 806     i = strlen(nameB->data);
 807     if ((strncmp(buf, "-----END ", 9) != 0) ||
 808         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 809         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 810         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
 811         goto err;
 812     }
 813
 814     EVP_DecodeInit(ctx);
 815     i = EVP_DecodeUpdate(ctx,
 816                          (unsigned char *)dataB->data, &bl,
 817                          (unsigned char *)dataB->data, bl);
 818     if (i < 0) {
 819         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 820         goto err;
 821     }
 822     i = EVP_DecodeFinal(ctx, (unsigned char *)&(dataB->data[bl]), &k);
 823     if (i < 0) {
 824         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 825         goto err;
 826     }
 827     bl += k;
 828
 829     if (bl == 0)
 830         goto err;
 831     *name = nameB->data;
 832     *header = headerB->data;
 833     *data = (unsigned char *)dataB->data;
 834     *len = bl;
 835     OPENSSL_free(nameB);
 836     OPENSSL_free(headerB);
 837     OPENSSL_free(dataB);
 838     EVP_ENCODE_CTX_free(ctx);
 839     return (1);
 840  err:
 841     BUF_MEM_free(nameB);
 842     BUF_MEM_free(headerB);
 843     BUF_MEM_free(dataB);
 844     EVP_ENCODE_CTX_free(ctx);
 845     return (0);
 846 }
 847
 848 /*
 849  * Check pem string and return prefix length. If for example the pem_str ==
 850  * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
 851  * string "RSA".
 852  */
 853
 854 int pem_check_suffix(const char *pem_str, const char *suffix)
 855 {
 856     int pem_len = strlen(pem_str);
 857     int suffix_len = strlen(suffix);
 858     const char *p;
 859     if (suffix_len + 1 >= pem_len)
 860         return 0;
 861     p = pem_str + pem_len - suffix_len;
 862     if (strcmp(p, suffix))
 863         return 0;
 864     p--;
 865     if (*p != ' ')
 866         return 0;
 867     return p - pem_str;
 868 }