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 "cryptlib.h"
  62 #include <openssl/buffer.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/rand.h>
  66 #include <openssl/x509.h>
  67 #include <openssl/pem.h>
  68 #include <openssl/pkcs12.h>
  69 #include "asn1_locl.h"
  70 #ifndef OPENSSL_NO_DES
  71 # include <openssl/des.h>
  72 #endif
  73 #ifndef OPENSSL_NO_ENGINE
  74 # include <openssl/engine.h>
  75 #endif
  76
  77 const char PEM_version[] = "PEM" OPENSSL_VERSION_PTEXT;
  78
  79 #define MIN_LENGTH      4
  80
  81 static int load_iv(char **fromp, unsigned char *to, int num);
  82 static int check_pem(const char *nm, const char *name);
  83 int pem_check_suffix(const char *pem_str, const char *suffix);
  84
  85 int PEM_def_callback(char *buf, int num, int w, void *key)
  86 {
  87 #ifdef OPENSSL_NO_FP_API
  88     /*
  89      * We should not ever call the default callback routine from windows.
  90      */
  91     PEMerr(PEM_F_PEM_DEF_CALLBACK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  92     return (-1);
  93 #else
  94     int i, j;
  95     const char *prompt;
  96     if (key) {
  97         i = strlen(key);
  98         i = (i > num) ? num : i;
  99         memcpy(buf, key, i);
 100         return (i);
 101     }
 102
 103     prompt = EVP_get_pw_prompt();
 104     if (prompt == NULL)
 105         prompt = "Enter PEM pass phrase:";
 106
 107     for (;;) {
 108         i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);
 109         if (i != 0) {
 110             PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
 111             memset(buf, 0, (unsigned int)num);
 112             return (-1);
 113         }
 114         j = strlen(buf);
 115         if (j < MIN_LENGTH) {
 116             fprintf(stderr,
 117                     "phrase is too short, needs to be at least %d chars\n",
 118                     MIN_LENGTH);
 119         } else
 120             break;
 121     }
 122     return (j);
 123 #endif
 124 }
 125
 126 void PEM_proc_type(char *buf, int type)
 127 {
 128     const char *str;
 129
 130     if (type == PEM_TYPE_ENCRYPTED)
 131         str = "ENCRYPTED";
 132     else if (type == PEM_TYPE_MIC_CLEAR)
 133         str = "MIC-CLEAR";
 134     else if (type == PEM_TYPE_MIC_ONLY)
 135         str = "MIC-ONLY";
 136     else
 137         str = "BAD-TYPE";
 138
 139     BUF_strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);
 140     BUF_strlcat(buf, str, PEM_BUFSIZE);
 141     BUF_strlcat(buf, "\n", PEM_BUFSIZE);
 142 }
 143
 144 void PEM_dek_info(char *buf, const char *type, int len, char *str)
 145 {
 146     static const unsigned char map[17] = "0123456789ABCDEF";
 147     long i;
 148     int j;
 149
 150     BUF_strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);
 151     BUF_strlcat(buf, type, PEM_BUFSIZE);
 152     BUF_strlcat(buf, ",", PEM_BUFSIZE);
 153     j = strlen(buf);
 154     if (j + (len * 2) + 1 > PEM_BUFSIZE)
 155         return;
 156     for (i = 0; i < len; i++) {
 157         buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];
 158         buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];
 159     }
 160     buf[j + i * 2] = '\n';
 161     buf[j + i * 2 + 1] = '\0';
 162 }
 163
 164 #ifndef OPENSSL_NO_FP_API
 165 void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
 166                     pem_password_cb *cb, void *u)
 167 {
 168     BIO *b;
 169     void *ret;
 170
 171     if ((b = BIO_new(BIO_s_file())) == NULL) {
 172         PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
 173         return (0);
 174     }
 175     BIO_set_fp(b, fp, BIO_NOCLOSE);
 176     ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
 177     BIO_free(b);
 178     return (ret);
 179 }
 180 #endif
 181
 182 static int check_pem(const char *nm, const char *name)
 183 {
 184     /* Normal matching nm and name */
 185     if (!strcmp(nm, name))
 186         return 1;
 187
 188     /* Make PEM_STRING_EVP_PKEY match any private key */
 189
 190     if (!strcmp(name, PEM_STRING_EVP_PKEY)) {
 191         int slen;
 192         const EVP_PKEY_ASN1_METHOD *ameth;
 193         if (!strcmp(nm, PEM_STRING_PKCS8))
 194             return 1;
 195         if (!strcmp(nm, PEM_STRING_PKCS8INF))
 196             return 1;
 197         slen = pem_check_suffix(nm, "PRIVATE KEY");
 198         if (slen > 0) {
 199             /*
 200              * NB: ENGINE implementations wont contain a deprecated old
 201              * private key decode function so don't look for them.
 202              */
 203             ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
 204             if (ameth && ameth->old_priv_decode)
 205                 return 1;
 206         }
 207         return 0;
 208     }
 209
 210     if (!strcmp(name, PEM_STRING_PARAMETERS)) {
 211         int slen;
 212         const EVP_PKEY_ASN1_METHOD *ameth;
 213         slen = pem_check_suffix(nm, "PARAMETERS");
 214         if (slen > 0) {
 215             ENGINE *e;
 216             ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
 217             if (ameth) {
 218                 int r;
 219                 if (ameth->param_decode)
 220                     r = 1;
 221                 else
 222                     r = 0;
 223 #ifndef OPENSSL_NO_ENGINE
 224                 if (e)
 225                     ENGINE_finish(e);
 226 #endif
 227                 return r;
 228             }
 229         }
 230         return 0;
 231     }
 232
 233     /* Permit older strings */
 234
 235     if (!strcmp(nm, PEM_STRING_X509_OLD) && !strcmp(name, PEM_STRING_X509))
 236         return 1;
 237
 238     if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&
 239         !strcmp(name, PEM_STRING_X509_REQ))
 240         return 1;
 241
 242     /* Allow normal certs to be read as trusted certs */
 243     if (!strcmp(nm, PEM_STRING_X509) &&
 244         !strcmp(name, PEM_STRING_X509_TRUSTED))
 245         return 1;
 246
 247     if (!strcmp(nm, PEM_STRING_X509_OLD) &&
 248         !strcmp(name, PEM_STRING_X509_TRUSTED))
 249         return 1;
 250
 251     /* Some CAs use PKCS#7 with CERTIFICATE headers */
 252     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_PKCS7))
 253         return 1;
 254
 255     if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
 256         !strcmp(name, PEM_STRING_PKCS7))
 257         return 1;
 258
 259 #ifndef OPENSSL_NO_CMS
 260     if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))
 261         return 1;
 262     /* Allow CMS to be read from PKCS#7 headers */
 263     if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))
 264         return 1;
 265 #endif
 266
 267     return 0;
 268 }
 269
 270 int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
 271                        const char *name, BIO *bp, pem_password_cb *cb,
 272                        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()) == PEM_R_NO_START_LINE)
 283                 ERR_add_error_data(2, "Expecting: ", name);
 284             return 0;
 285         }
 286         if (check_pem(nm, name))
 287             break;
 288         OPENSSL_free(nm);
 289         OPENSSL_free(header);
 290         OPENSSL_free(data);
 291     }
 292     if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
 293         goto err;
 294     if (!PEM_do_header(&cipher, data, &len, cb, u))
 295         goto err;
 296
 297     *pdata = data;
 298     *plen = len;
 299
 300     if (pnm)
 301         *pnm = nm;
 302
 303     ret = 1;
 304
 305  err:
 306     if (!ret || !pnm)
 307         OPENSSL_free(nm);
 308     OPENSSL_free(header);
 309     if (!ret)
 310         OPENSSL_free(data);
 311     return ret;
 312 }
 313
 314 #ifndef OPENSSL_NO_FP_API
 315 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
 316                    void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 317                    int klen, pem_password_cb *callback, void *u)
 318 {
 319     BIO *b;
 320     int ret;
 321
 322     if ((b = BIO_new(BIO_s_file())) == NULL) {
 323         PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
 324         return (0);
 325     }
 326     BIO_set_fp(b, fp, BIO_NOCLOSE);
 327     ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
 328     BIO_free(b);
 329     return (ret);
 330 }
 331 #endif
 332
 333 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
 334                        void *x, const EVP_CIPHER *enc, unsigned char *kstr,
 335                        int klen, pem_password_cb *callback, void *u)
 336 {
 337     EVP_CIPHER_CTX ctx;
 338     int dsize = 0, i, j, ret = 0;
 339     unsigned char *p, *data = NULL;
 340     const char *objstr = NULL;
 341     char buf[PEM_BUFSIZE];
 342     unsigned char key[EVP_MAX_KEY_LENGTH];
 343     unsigned char iv[EVP_MAX_IV_LENGTH];
 344
 345     if (enc != NULL) {
 346         objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
 347         if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0) {
 348             PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
 349             goto err;
 350         }
 351     }
 352
 353     if ((dsize = i2d(x, NULL)) < 0) {
 354         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
 355         dsize = 0;
 356         goto err;
 357     }
 358     /* dzise + 8 bytes are needed */
 359     /* actually it needs the cipher block size extra... */
 360     data = (unsigned char *)OPENSSL_malloc((unsigned int)dsize + 20);
 361     if (data == NULL) {
 362         PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
 363         goto err;
 364     }
 365     p = data;
 366     i = i2d(x, &p);
 367
 368     if (enc != NULL) {
 369         if (kstr == NULL) {
 370             if (callback == NULL)
 371                 klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
 372             else
 373                 klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
 374             if (klen <= 0) {
 375                 PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
 376                 goto err;
 377             }
 378 #ifdef CHARSET_EBCDIC
 379             /* Convert the pass phrase from EBCDIC */
 380             ebcdic2ascii(buf, buf, klen);
 381 #endif
 382             kstr = (unsigned char *)buf;
 383         }
 384         RAND_add(data, i, 0);   /* put in the RSA key. */
 385         OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
 386         if (RAND_bytes(iv, enc->iv_len) <= 0) /* Generate a salt */
 387             goto err;
 388         /*
 389          * The 'iv' is used as the iv and as a salt.  It is NOT taken from
 390          * the BytesToKey function
 391          */
 392         if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
 393             goto err;
 394
 395         if (kstr == (unsigned char *)buf)
 396             OPENSSL_cleanse(buf, PEM_BUFSIZE);
 397
 398         OPENSSL_assert(strlen(objstr) + 23 + 2 * enc->iv_len + 13 <=
 399                        sizeof buf);
 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     OPENSSL_cleanse(key, sizeof(key));
 425     OPENSSL_cleanse(iv, sizeof(iv));
 426     OPENSSL_cleanse((char *)&ctx, sizeof(ctx));
 427     OPENSSL_cleanse(buf, PEM_BUFSIZE);
 428     if (data != NULL) {
 429         OPENSSL_cleanse(data, (unsigned int)dsize);
 430         OPENSSL_free(data);
 431     }
 432     return (ret);
 433 }
 434
 435 int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 436                   pem_password_cb *callback, void *u)
 437 {
 438     int i = 0, j, o, klen;
 439     long len;
 440     EVP_CIPHER_CTX ctx;
 441     unsigned char key[EVP_MAX_KEY_LENGTH];
 442     char buf[PEM_BUFSIZE];
 443
 444     len = *plen;
 445
 446     if (cipher->cipher == NULL)
 447         return (1);
 448     if (callback == NULL)
 449         klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
 450     else
 451         klen = callback(buf, PEM_BUFSIZE, 0, u);
 452     if (klen <= 0) {
 453         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
 454         return (0);
 455     }
 456 #ifdef CHARSET_EBCDIC
 457     /* Convert the pass phrase from EBCDIC */
 458     ebcdic2ascii(buf, buf, klen);
 459 #endif
 460
 461     if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
 462                         (unsigned char *)buf, klen, 1, key, NULL))
 463         return 0;
 464
 465     j = (int)len;
 466     EVP_CIPHER_CTX_init(&ctx);
 467     o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
 468     if (o)
 469         o = EVP_DecryptUpdate(&ctx, data, &i, data, j);
 470     if (o)
 471         o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);
 472     EVP_CIPHER_CTX_cleanup(&ctx);
 473     OPENSSL_cleanse((char *)buf, sizeof(buf));
 474     OPENSSL_cleanse((char *)key, sizeof(key));
 475     j += i;
 476     if (!o) {
 477         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
 478         return (0);
 479     }
 480     *plen = j;
 481     return (1);
 482 }
 483
 484 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
 485 {
 486     const EVP_CIPHER *enc = NULL;
 487     char *p, c;
 488     char **header_pp = &header;
 489
 490     cipher->cipher = NULL;
 491     if ((header == NULL) || (*header == '\0') || (*header == '\n'))
 492         return (1);
 493     if (strncmp(header, "Proc-Type: ", 11) != 0) {
 494         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
 495         return (0);
 496     }
 497     header += 11;
 498     if (*header != '4')
 499         return (0);
 500     header++;
 501     if (*header != ',')
 502         return (0);
 503     header++;
 504     if (strncmp(header, "ENCRYPTED", 9) != 0) {
 505         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
 506         return (0);
 507     }
 508     for (; (*header != '\n') && (*header != '\0'); header++) ;
 509     if (*header == '\0') {
 510         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
 511         return (0);
 512     }
 513     header++;
 514     if (strncmp(header, "DEK-Info: ", 10) != 0) {
 515         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
 516         return (0);
 517     }
 518     header += 10;
 519
 520     p = header;
 521     for (;;) {
 522         c = *header;
 523 #ifndef CHARSET_EBCDIC
 524         if (!(((c >= 'A') && (c <= 'Z')) || (c == '-') ||
 525               ((c >= '0') && (c <= '9'))))
 526             break;
 527 #else
 528         if (!(isupper(c) || (c == '-') || isdigit(c)))
 529             break;
 530 #endif
 531         header++;
 532     }
 533     *header = '\0';
 534     cipher->cipher = enc = EVP_get_cipherbyname(p);
 535     *header = c;
 536     header++;
 537
 538     if (enc == NULL) {
 539         PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
 540         return (0);
 541     }
 542     if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))
 543         return (0);
 544
 545     return (1);
 546 }
 547
 548 static int load_iv(char **fromp, unsigned char *to, int num)
 549 {
 550     int v, i;
 551     char *from;
 552
 553     from = *fromp;
 554     for (i = 0; i < num; i++)
 555         to[i] = 0;
 556     num *= 2;
 557     for (i = 0; i < num; i++) {
 558         if ((*from >= '0') && (*from <= '9'))
 559             v = *from - '0';
 560         else if ((*from >= 'A') && (*from <= 'F'))
 561             v = *from - 'A' + 10;
 562         else if ((*from >= 'a') && (*from <= 'f'))
 563             v = *from - 'a' + 10;
 564         else {
 565             PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
 566             return (0);
 567         }
 568         from++;
 569         to[i / 2] |= v << (long)((!(i & 1)) * 4);
 570     }
 571
 572     *fromp = from;
 573     return (1);
 574 }
 575
 576 #ifndef OPENSSL_NO_FP_API
 577 int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
 578               long len)
 579 {
 580     BIO *b;
 581     int ret;
 582
 583     if ((b = BIO_new(BIO_s_file())) == NULL) {
 584         PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
 585         return (0);
 586     }
 587     BIO_set_fp(b, fp, BIO_NOCLOSE);
 588     ret = PEM_write_bio(b, name, header, data, len);
 589     BIO_free(b);
 590     return (ret);
 591 }
 592 #endif
 593
 594 int PEM_write_bio(BIO *bp, const char *name, char *header,
 595                   unsigned char *data, long len)
 596 {
 597     int nlen, n, i, j, outl;
 598     unsigned char *buf = NULL;
 599     EVP_ENCODE_CTX ctx;
 600     int reason = ERR_R_BUF_LIB;
 601
 602     EVP_EncodeInit(&ctx);
 603     nlen = strlen(name);
 604
 605     if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
 606         (BIO_write(bp, name, nlen) != nlen) ||
 607         (BIO_write(bp, "-----\n", 6) != 6))
 608         goto err;
 609
 610     i = strlen(header);
 611     if (i > 0) {
 612         if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
 613             goto err;
 614     }
 615
 616     buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
 617     if (buf == NULL) {
 618         reason = ERR_R_MALLOC_FAILURE;
 619         goto err;
 620     }
 621
 622     i = j = 0;
 623     while (len > 0) {
 624         n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
 625         EVP_EncodeUpdate(&ctx, buf, &outl, &(data[j]), n);
 626         if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
 627             goto err;
 628         i += outl;
 629         len -= n;
 630         j += n;
 631     }
 632     EVP_EncodeFinal(&ctx, buf, &outl);
 633     if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
 634         goto err;
 635     OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
 636     OPENSSL_free(buf);
 637     buf = NULL;
 638     if ((BIO_write(bp, "-----END ", 9) != 9) ||
 639         (BIO_write(bp, name, nlen) != nlen) ||
 640         (BIO_write(bp, "-----\n", 6) != 6))
 641         goto err;
 642     return (i + outl);
 643  err:
 644     if (buf) {
 645         OPENSSL_cleanse(buf, PEM_BUFSIZE * 8);
 646         OPENSSL_free(buf);
 647     }
 648     PEMerr(PEM_F_PEM_WRITE_BIO, reason);
 649     return (0);
 650 }
 651
 652 #ifndef OPENSSL_NO_FP_API
 653 int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
 654              long *len)
 655 {
 656     BIO *b;
 657     int ret;
 658
 659     if ((b = BIO_new(BIO_s_file())) == NULL) {
 660         PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
 661         return (0);
 662     }
 663     BIO_set_fp(b, fp, BIO_NOCLOSE);
 664     ret = PEM_read_bio(b, name, header, data, len);
 665     BIO_free(b);
 666     return (ret);
 667 }
 668 #endif
 669
 670 int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
 671                  long *len)
 672 {
 673     EVP_ENCODE_CTX ctx;
 674     int end = 0, i, k, bl = 0, hl = 0, nohead = 0;
 675     char buf[256];
 676     BUF_MEM *nameB;
 677     BUF_MEM *headerB;
 678     BUF_MEM *dataB, *tmpB;
 679
 680     nameB = BUF_MEM_new();
 681     headerB = BUF_MEM_new();
 682     dataB = BUF_MEM_new();
 683     if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {
 684         BUF_MEM_free(nameB);
 685         BUF_MEM_free(headerB);
 686         BUF_MEM_free(dataB);
 687         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 688         return (0);
 689     }
 690
 691     buf[254] = '\0';
 692     for (;;) {
 693         i = BIO_gets(bp, buf, 254);
 694
 695         if (i <= 0) {
 696             PEMerr(PEM_F_PEM_READ_BIO, PEM_R_NO_START_LINE);
 697             goto err;
 698         }
 699
 700         while ((i >= 0) && (buf[i] <= ' '))
 701             i--;
 702         buf[++i] = '\n';
 703         buf[++i] = '\0';
 704
 705         if (strncmp(buf, "-----BEGIN ", 11) == 0) {
 706             i = strlen(&(buf[11]));
 707
 708             if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)
 709                 continue;
 710             if (!BUF_MEM_grow(nameB, i + 9)) {
 711                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 712                 goto err;
 713             }
 714             memcpy(nameB->data, &(buf[11]), i - 6);
 715             nameB->data[i - 6] = '\0';
 716             break;
 717         }
 718     }
 719     hl = 0;
 720     if (!BUF_MEM_grow(headerB, 256)) {
 721         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 722         goto err;
 723     }
 724     headerB->data[0] = '\0';
 725     for (;;) {
 726         i = BIO_gets(bp, buf, 254);
 727         if (i <= 0)
 728             break;
 729
 730         while ((i >= 0) && (buf[i] <= ' '))
 731             i--;
 732         buf[++i] = '\n';
 733         buf[++i] = '\0';
 734
 735         if (buf[0] == '\n')
 736             break;
 737         if (!BUF_MEM_grow(headerB, hl + i + 9)) {
 738             PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 739             goto err;
 740         }
 741         if (strncmp(buf, "-----END ", 9) == 0) {
 742             nohead = 1;
 743             break;
 744         }
 745         memcpy(&(headerB->data[hl]), buf, i);
 746         headerB->data[hl + i] = '\0';
 747         hl += i;
 748     }
 749
 750     bl = 0;
 751     if (!BUF_MEM_grow(dataB, 1024)) {
 752         PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 753         goto err;
 754     }
 755     dataB->data[0] = '\0';
 756     if (!nohead) {
 757         for (;;) {
 758             i = BIO_gets(bp, buf, 254);
 759             if (i <= 0)
 760                 break;
 761
 762             while ((i >= 0) && (buf[i] <= ' '))
 763                 i--;
 764             buf[++i] = '\n';
 765             buf[++i] = '\0';
 766
 767             if (i != 65)
 768                 end = 1;
 769             if (strncmp(buf, "-----END ", 9) == 0)
 770                 break;
 771             if (i > 65)
 772                 break;
 773             if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {
 774                 PEMerr(PEM_F_PEM_READ_BIO, ERR_R_MALLOC_FAILURE);
 775                 goto err;
 776             }
 777             memcpy(&(dataB->data[bl]), buf, i);
 778             dataB->data[bl + i] = '\0';
 779             bl += i;
 780             if (end) {
 781                 buf[0] = '\0';
 782                 i = BIO_gets(bp, buf, 254);
 783                 if (i <= 0)
 784                     break;
 785
 786                 while ((i >= 0) && (buf[i] <= ' '))
 787                     i--;
 788                 buf[++i] = '\n';
 789                 buf[++i] = '\0';
 790
 791                 break;
 792             }
 793         }
 794     } else {
 795         tmpB = headerB;
 796         headerB = dataB;
 797         dataB = tmpB;
 798         bl = hl;
 799     }
 800     i = strlen(nameB->data);
 801     if ((strncmp(buf, "-----END ", 9) != 0) ||
 802         (strncmp(nameB->data, &(buf[9]), i) != 0) ||
 803         (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {
 804         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_END_LINE);
 805         goto err;
 806     }
 807
 808     EVP_DecodeInit(&ctx);
 809     i = EVP_DecodeUpdate(&ctx,
 810                          (unsigned char *)dataB->data, &bl,
 811                          (unsigned char *)dataB->data, bl);
 812     if (i < 0) {
 813         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 814         goto err;
 815     }
 816     i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);
 817     if (i < 0) {
 818         PEMerr(PEM_F_PEM_READ_BIO, PEM_R_BAD_BASE64_DECODE);
 819         goto err;
 820     }
 821     bl += k;
 822
 823     if (bl == 0)
 824         goto err;
 825     *name = nameB->data;
 826     *header = headerB->data;
 827     *data = (unsigned char *)dataB->data;
 828     *len = bl;
 829     OPENSSL_free(nameB);
 830     OPENSSL_free(headerB);
 831     OPENSSL_free(dataB);
 832     return (1);
 833  err:
 834     BUF_MEM_free(nameB);
 835     BUF_MEM_free(headerB);
 836     BUF_MEM_free(dataB);
 837     return (0);
 838 }
 839
 840 /*
 841  * Check pem string and return prefix length. If for example the pem_str ==
 842  * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
 843  * string "RSA".
 844  */
 845
 846 int pem_check_suffix(const char *pem_str, const char *suffix)
 847 {
 848     int pem_len = strlen(pem_str);
 849     int suffix_len = strlen(suffix);
 850     const char *p;
 851     if (suffix_len + 1 >= pem_len)
 852         return 0;
 853     p = pem_str + pem_len - suffix_len;
 854     if (strcmp(p, suffix))
 855         return 0;
 856     p--;
 857     if (*p != ' ')
 858         return 0;
 859     return p - pem_str;
 860 }