src/crypto.c

   1 /*
   2     Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
   3     Ben Kibbey <bjk@luxsci.net>
   4
   5     This file is part of pwmd.
   6
   7     Pwmd is free software: you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation, either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     Pwmd is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with Pwmd.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <errno.h>
  29 #include <netinet/in.h>
  30 #include <arpa/inet.h>
  31
  32 #ifdef WITH_LIBACL
  33 #include <sys/acl.h>
  34 #endif
  35
  36 #include "pwmd-error.h"
  37 #include "util-misc.h"
  38 #include "common.h"
  39 #include "rcfile.h"
  40 #include "pinentry.h"
  41 #include "crypto.h"
  42 #include "cache.h"
  43 #include "mem.h"
  44 #include "util-string.h"
  45
  46 static uint8_t pwmd_magic[5] = { '\177', 'P', 'W', 'M', 'D' };
  47
  48 void
  49 set_header_defaults (file_header_t * hdr)
  50 {
  51   char *s = config_get_string (NULL, "cipher");
  52   int flags = cipher_string_to_cipher (s);
  53
  54   xfree (s);
  55   memset (hdr, 0, sizeof (file_header_t));
  56   memcpy (hdr->magic, pwmd_magic, sizeof (hdr->magic));
  57   if (flags == -1)
  58     log_write (_
  59                ("Invalid 'cipher' in configuration file. Using a default of aes256."));
  60   hdr->flags = flags == -1 ? PWMD_CIPHER_AES256 : flags;
  61   hdr->version = VERSION_HEX;
  62
  63 #ifdef WITH_AGENT
  64   if (use_agent)
  65     hdr->flags |= PWMD_FLAG_PKCS;
  66 #endif
  67 }
  68
  69 static gpg_error_t
  70 read_header (file_header_t *hdr, int fd)
  71 {
  72   ssize_t len;
  73   uint32_t i;
  74   uint64_t n;
  75
  76 #ifdef WORDS_BIGENDIAN
  77   len = read (fd, &hdr->magic, sizeof(hdr->magic));
  78   if (len == -1)
  79     goto done;
  80
  81   len = read (fd, &hdr->version, sizeof(hdr->version));
  82   if (len == -1)
  83     goto done;
  84
  85   len = read (fd, &hdr->iterations, sizeof(hdr->iterations));
  86   if (len == -1)
  87     goto done;
  88
  89   len = read (fd, &hdr->flags, sizeof(hdr->flags));
  90   if (len == -1)
  91     goto done;
  92
  93   len = read (fd, &hdr->iv, sizeof(hdr->iv));
  94   if (len == -1)
  95     goto done;
  96
  97   len = read (fd, &hdr->salt, sizeof(hdr->salt));
  98   if (len == -1)
  99     goto done;
 100
 101   len = read (fd, &hdr->datalen, sizeof(hdr->datalen));
 102   if (len == -1)
 103     goto done;
 104 #else
 105   len = read (fd, &hdr->magic, sizeof(hdr->magic));
 106   if (len == -1)
 107     goto done;
 108
 109   len = read (fd, &i, sizeof(hdr->version));
 110   if (len == -1)
 111     goto done;
 112   hdr->version = ntohl (i);
 113
 114   len = read (fd, &n, sizeof(hdr->iterations));
 115   if (len == -1)
 116     goto done;
 117   hdr->iterations = (((uint64_t) ntohl (n)) << 32) + ntohl (n >> 32);
 118
 119   len = read (fd, &n, sizeof(hdr->flags));
 120   if (len == -1)
 121     goto done;
 122   hdr->flags = (((uint64_t) ntohl (n)) << 32) + ntohl (n >> 32);
 123
 124   len = read (fd, &hdr->iv, sizeof(hdr->iv));
 125   if (len == -1)
 126     goto done;
 127
 128   len = read (fd, &hdr->salt, sizeof(hdr->salt));
 129   if (len == -1)
 130     goto done;
 131
 132   len = read (fd, &i, sizeof(hdr->datalen));
 133   if (len == -1)
 134     goto done;
 135   hdr->datalen = ntohl (i);
 136 #endif
 137
 138  done:
 139   return len == -1 ? gpg_error_from_syserror () : 0;
 140 }
 141
 142 gpg_error_t
 143 read_data_header (const char *filename, file_header_t * rhdr,
 144                   struct stat *rst, int *rfd)
 145 {
 146   gpg_error_t rc = 0;
 147   struct stat st;
 148   file_header_t hdr;
 149   int fd;
 150
 151   if (lstat (filename, &st) == -1)
 152     return gpg_error_from_syserror ();
 153
 154   if (!S_ISREG (st.st_mode))
 155     return GPG_ERR_ENOANO;
 156
 157   fd = open (filename, O_RDONLY);
 158   if (fd == -1)
 159     return gpg_error_from_syserror ();
 160
 161   rc = read_header (&hdr, fd);
 162   if (!rc && memcmp (hdr.magic, pwmd_magic, sizeof (hdr.magic)))
 163     rc = GPG_ERR_BAD_DATA;
 164   else if (hdr.version < 0x030000)
 165     rc = GPG_ERR_UNKNOWN_VERSION;
 166
 167   if (rc)
 168     close (fd);
 169   else
 170     {
 171       if (rhdr)
 172         *rhdr = hdr;
 173       if (rst)
 174         *rst = st;
 175       if (rfd)
 176         *rfd = fd;
 177       else
 178         close (fd);
 179     }
 180
 181   return rc;
 182 }
 183
 184 gpg_error_t
 185 read_data_file (const char *filename, struct crypto_s * crypto)
 186 {
 187   int fd;
 188   gpg_error_t rc = 0;
 189   size_t len, rlen;
 190   char *buf = NULL;
 191   struct stat st;
 192
 193   cleanup_crypto_stage1 (crypto);
 194   rc = read_data_header (filename, &crypto->hdr, &st, &fd);
 195   if (rc)
 196     return rc;
 197
 198   crypto->ciphertext_len = crypto->hdr.datalen;
 199   crypto->ciphertext = xmalloc (crypto->hdr.datalen);
 200   if (!crypto->ciphertext)
 201     {
 202       rc = GPG_ERR_ENOMEM;
 203       goto fail;
 204     }
 205
 206   if (crypto->hdr.flags & PWMD_FLAG_PKCS)
 207     {
 208       rlen = read (fd, crypto->grip, 20);
 209       if (rlen != 20)
 210         {
 211           rc = rc == -1 ? gpg_error_from_syserror () : GPG_ERR_BAD_DATA;
 212           goto fail;
 213         }
 214
 215       rlen = read (fd, crypto->sign_grip, 20);
 216       if (rlen != 20)
 217         {
 218           rc = rc == -1 ? gpg_error_from_syserror () : GPG_ERR_BAD_DATA;
 219           goto fail;
 220         }
 221     }
 222
 223   len = read (fd, crypto->ciphertext, crypto->hdr.datalen);
 224   if (len != crypto->hdr.datalen)
 225     {
 226       rc = rc == -1 ? gpg_error_from_syserror () : GPG_ERR_BAD_DATA;
 227       goto fail;
 228     }
 229
 230   if (!(crypto->hdr.flags & PWMD_FLAG_PKCS))
 231     goto fail;
 232
 233 #ifndef WITH_AGENT
 234   rc = GPG_ERR_NOT_IMPLEMENTED;
 235   goto fail;
 236 #else
 237   if (!use_agent)
 238     return GPG_ERR_NOT_IMPLEMENTED;
 239
 240   len = st.st_size - sizeof (file_header_t) - crypto->hdr.datalen - 40;
 241   buf = xmalloc (len);
 242   if (!buf)
 243     {
 244       rc = GPG_ERR_ENOMEM;
 245       goto fail;
 246     }
 247
 248   rlen = read (fd, buf, len);
 249   if (rlen != len)
 250     {
 251       rc = rc == -1 ? gpg_error_from_syserror () : GPG_ERR_BAD_DATA;
 252       goto fail;
 253     }
 254
 255   rc = gcry_sexp_new (&crypto->ciphertext_sexp, buf, rlen, 1);
 256   if (rc)
 257     goto fail;
 258
 259   if (crypto->pkey_sexp)
 260     gcry_sexp_release (crypto->pkey_sexp);
 261
 262   if (crypto->sigpkey_sexp)
 263     gcry_sexp_release (crypto->sigpkey_sexp);
 264
 265   crypto->pkey_sexp = crypto->sigpkey_sexp = NULL;
 266   rc = get_pubkey_bin (crypto, crypto->grip, &crypto->pkey_sexp);
 267   if (!rc)
 268     rc = get_pubkey_bin (crypto, crypto->sign_grip, &crypto->sigpkey_sexp);
 269 #endif
 270
 271 fail:
 272   close (fd);
 273   xfree (buf);
 274   return rc;
 275 }
 276
 277 #define CRYPTO_BLOCKSIZE(c) (blocksize * 1024)
 278
 279 /*
 280  * Useful for a large amount of data. Rather than doing all of the data in one
 281  * iteration do it in chunks.  This lets the command be cancelable rather than
 282  * waiting for it to complete.
 283  */
 284 static gpg_error_t
 285 iterate_crypto_once (gcry_cipher_hd_t h, unsigned char *inbuf,
 286                      size_t insize, size_t blocksize, status_msg_t which)
 287 {
 288   gpg_error_t rc = 0;
 289   off_t len = CRYPTO_BLOCKSIZE (blocksize);
 290   void *p = gcry_malloc (len);
 291   off_t total = 0;
 292   unsigned char *inbuf2;
 293
 294   if (!p)
 295     return GPG_ERR_ENOMEM;
 296
 297   if (insize < CRYPTO_BLOCKSIZE (blocksize))
 298     len = insize;
 299
 300   pthread_cleanup_push (gcry_free, p);
 301
 302   for (;;)
 303     {
 304       inbuf2 = inbuf + total;
 305       unsigned char *tmp;
 306
 307       if (len + total > insize)
 308         len = blocksize;
 309
 310       if (which == STATUS_ENCRYPT)
 311         rc = gcry_cipher_encrypt (h, p, len, inbuf2, len);
 312       else
 313         rc = gcry_cipher_decrypt (h, p, len, inbuf2, len);
 314
 315       if (rc)
 316         break;
 317
 318       tmp = inbuf + total;
 319       memmove (tmp, p, len);
 320       total += len;
 321       if (total >= insize)
 322         break;
 323
 324 #ifdef HAVE_PTHREAD_TESTCANCEL
 325       pthread_testcancel ();
 326 #endif
 327     }
 328
 329   pthread_cleanup_pop (1);
 330   return rc;
 331 }
 332
 333 static void
 334 cleanup_cipher (void *arg)
 335 {
 336   gcry_cipher_close ((gcry_cipher_hd_t) arg);
 337 }
 338
 339 gpg_error_t
 340 decrypt_data (assuan_context_t ctx, struct crypto_s *crypto,
 341               unsigned char *salted_key, size_t skeylen)
 342 {
 343   gpg_error_t rc = 0;
 344   unsigned char *key = salted_key;
 345   gcry_cipher_hd_t h = NULL;
 346   size_t blocksize, keysize = 0;
 347   int algo = cipher_to_gcrypt (crypto->hdr.flags);
 348   void *outbuf = NULL;
 349   uint64_t n = crypto->hdr.iterations;
 350   long progress = 0;
 351 #ifdef WITH_AGENT
 352   size_t keylen = skeylen;
 353   gcry_sexp_t sig_sexp;
 354
 355   if (crypto->hdr.flags & PWMD_FLAG_PKCS)
 356     {
 357       rc = agent_extract_key (crypto, &key, &keylen);
 358       if (rc)
 359         return rc;
 360
 361       sig_sexp = gcry_sexp_find_token (crypto->ciphertext_sexp, "sig-val", 0);
 362       if (!sig_sexp)
 363         {
 364           gcry_free (key);
 365           return GPG_ERR_BAD_DATA;
 366         }
 367
 368       rc = agent_verify (crypto->sigpkey_sexp, sig_sexp, crypto->ciphertext,
 369                    crypto->ciphertext_len);
 370       gcry_sexp_release (sig_sexp);
 371     }
 372 #endif
 373
 374   if (!rc)
 375     {
 376       rc = gcry_cipher_open (&h, algo, GCRY_CIPHER_MODE_CBC, 0);
 377       if (!rc)
 378         {
 379           rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL,
 380                                       &keysize);
 381           if (!rc)
 382             {
 383               rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_BLKLEN, NULL,
 384                                           &blocksize);
 385               if (!rc)
 386                 {
 387                   rc = gcry_cipher_setiv (h, crypto->hdr.iv, blocksize);
 388                   if (!rc)
 389                     {
 390                       rc = gcry_cipher_setkey (h, key, keysize);
 391                     }
 392                 }
 393             }
 394         }
 395     }
 396
 397   pthread_cleanup_push (cleanup_cipher, rc ? NULL : h);
 398
 399   if (!rc)
 400     {
 401       outbuf = gcry_malloc (crypto->hdr.datalen);
 402       if (!outbuf)
 403         rc = GPG_ERR_ENOMEM;
 404     }
 405
 406   pthread_cleanup_push (gcry_free, outbuf);
 407 #ifdef WITH_AGENT
 408   pthread_cleanup_push (gcry_free, key);
 409 #endif
 410
 411   if (!rc)
 412     {
 413       memcpy (outbuf, crypto->ciphertext, crypto->hdr.datalen);
 414       rc = iterate_crypto_once (h, outbuf, crypto->hdr.datalen, blocksize,
 415                                 STATUS_DECRYPT);
 416       if (!rc)
 417         {
 418           key[0] ^= 1;
 419           rc = gcry_cipher_setkey (h, key, keysize);
 420         }
 421     }
 422
 423   if (!rc)
 424     {
 425       progress = config_get_long (NULL, "cipher_progress");
 426       if (progress == -1)
 427         progress = strtol (DEFAULT_ITERATION_PROGRESS, NULL, 10);
 428     }
 429
 430   if (!rc && ctx && crypto->hdr.iterations)
 431     rc = send_status (ctx, STATUS_DECRYPT, "%llu %llu", 0,
 432                       crypto->hdr.iterations);
 433
 434   for (n = 0; !rc && n < crypto->hdr.iterations; n++)
 435     {
 436       if (ctx && !(n % progress))
 437         {
 438           rc = send_status (ctx, STATUS_DECRYPT, "%llu %llu", n,
 439                             crypto->hdr.iterations);
 440           if (rc)
 441             break;
 442         }
 443
 444       rc = gcry_cipher_setiv (h, crypto->hdr.iv, blocksize);
 445       if (rc)
 446         break;
 447
 448       rc = iterate_crypto_once (h, outbuf, crypto->hdr.datalen, blocksize,
 449                                 STATUS_DECRYPT);
 450     }
 451
 452   if (!rc && ctx && crypto->hdr.iterations)
 453     rc = send_status (ctx, STATUS_DECRYPT, "%llu %llu", n,
 454                       crypto->hdr.iterations);
 455
 456 #ifdef WITH_AGENT
 457   pthread_cleanup_pop (0);
 458   if (crypto->hdr.flags & PWMD_FLAG_PKCS)
 459     gcry_free (key);
 460   else if (key)
 461     key[0] ^= 1;
 462 #else
 463   key[0] ^= 1;
 464 #endif
 465   pthread_cleanup_pop (rc ? 1 : 0);     /* outbuf */
 466   pthread_cleanup_pop (1);              /* cipher */
 467   if (!rc)
 468     {
 469       char buf[] = "<?xml ";
 470
 471       if (memcmp (outbuf, buf, sizeof(buf)-1))
 472         {
 473           gcry_free (outbuf);
 474           return gpg_error (GPG_ERR_BAD_PASSPHRASE);
 475         }
 476
 477       crypto->plaintext = outbuf;
 478       crypto->plaintext_len = crypto->hdr.datalen;
 479     }
 480
 481   return rc;
 482 }
 483
 484 gpg_error_t
 485 decrypt_xml (struct crypto_s * crypto, const void *data, size_t len)
 486 {
 487   gcry_cipher_hd_t h = NULL;
 488   gpg_error_t rc;
 489
 490   rc = gcry_cipher_open (&h, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 0);
 491   if (rc)
 492     return rc;
 493
 494   gcry_free (crypto->plaintext);
 495   crypto->plaintext = gcry_malloc (len);
 496   if (!crypto->plaintext)
 497     {
 498       rc = GPG_ERR_ENOMEM;
 499       goto done;
 500     }
 501
 502   rc = gcry_cipher_setiv (h, cache_iv, cache_blocksize);
 503   if (rc)
 504     goto done;
 505
 506   rc = gcry_cipher_setkey (h, cache_key, cache_keysize);
 507   if (rc)
 508     goto done;
 509
 510   rc = gcry_cipher_decrypt (h, crypto->plaintext, len, data, len);
 511   if (rc || strncmp (crypto->plaintext, "<?xml ", 6))
 512     {
 513       if (!rc)
 514         rc = GPG_ERR_BAD_DATA;
 515
 516       gcry_free (crypto->plaintext);
 517       crypto->plaintext = NULL;
 518     }
 519
 520   crypto->plaintext_len = len;
 521
 522 done:
 523   if (h)
 524     gcry_cipher_close (h);
 525
 526   return rc;
 527 }
 528
 529 gpg_error_t
 530 encrypt_xml (assuan_context_t ctx, void *key, size_t keylen,
 531              int algo, const void *xml, size_t len, void * *result,
 532              size_t *result_len, unsigned char **iv, size_t * iv_len,
 533              uint64_t iter)
 534 {
 535   gpg_error_t rc;
 536   gcry_cipher_hd_t h;
 537   size_t blocksize, keysize;
 538   void *inbuf = NULL;
 539   size_t olen = len;
 540   uint64_t n = 0;
 541   long progress;
 542   unsigned char *tmpkey = NULL;
 543   int free_iv = *(iv_len) == 0;
 544
 545   rc = gcry_cipher_open (&h, algo, GCRY_CIPHER_MODE_CBC, 0);
 546   if (rc)
 547     return rc;
 548
 549   pthread_cleanup_push (cleanup_cipher, h);
 550   rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL, &keysize);
 551   if (!rc)
 552     rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_BLKLEN, NULL, &blocksize);
 553
 554   if (!rc && *(iv_len) == 0)
 555     {
 556       *(iv) = xmalloc (blocksize);
 557       if (!*(iv))
 558         rc = GPG_ERR_ENOMEM;
 559
 560       gcry_create_nonce (*(iv), blocksize);
 561     }
 562
 563   pthread_cleanup_push (xfree, *(iv_len) == 0 ? *(iv) : NULL);
 564   if (!rc)
 565     {
 566       *iv_len = blocksize;
 567       tmpkey = gcry_malloc (keysize);
 568       if (!tmpkey)
 569         rc = GPG_ERR_ENOMEM;
 570     }
 571
 572   pthread_cleanup_push (gcry_free, tmpkey);
 573
 574   if (!rc)
 575     {
 576       memcpy (tmpkey, key, keysize);
 577       tmpkey[0] ^= 1;
 578       rc = gcry_cipher_setkey (h, tmpkey, keysize);
 579       if (!rc)
 580         {
 581           if (len % blocksize)
 582             len += blocksize - (len % blocksize);
 583         }
 584     }
 585
 586   if (!rc)
 587     {
 588       inbuf = gcry_malloc (len);
 589       if (!inbuf)
 590         rc = GPG_ERR_ENOMEM;
 591     }
 592
 593   pthread_cleanup_push (gcry_free, inbuf);
 594
 595   if (!rc)
 596     {
 597       memset (inbuf, 0, len);
 598       memcpy (inbuf, xml, olen);
 599       progress = config_get_long (NULL, "cipher_progress");
 600       if (progress == -1)
 601         progress = strtol (DEFAULT_ITERATION_PROGRESS, NULL, 10);
 602
 603       if (!rc && ctx && iter)
 604         rc = send_status (ctx, STATUS_ENCRYPT, "%llu %llu", 0, iter);
 605
 606       for (n = 0; !rc && n < iter; n++)
 607         {
 608           if (ctx && !(n % progress))
 609             {
 610               rc = send_status (ctx, STATUS_ENCRYPT, "%llu %llu", n, iter);
 611               if (rc)
 612                 break;
 613             }
 614
 615           rc = gcry_cipher_setiv (h, *(iv), blocksize);
 616           if (rc)
 617             break;
 618
 619           rc = iterate_crypto_once (h, inbuf, len, blocksize, STATUS_ENCRYPT);
 620         }
 621     }
 622
 623   if (!rc && ctx && iter)
 624     rc = send_status (ctx, STATUS_ENCRYPT, "%llu %llu", n, iter);
 625
 626   if (!rc)
 627     {
 628       /* Do at least one iteration. */
 629       rc = gcry_cipher_setiv (h, *(iv), blocksize);
 630       if (!rc)
 631         {
 632           rc = gcry_cipher_setkey (h, key, keysize);
 633           if (!rc)
 634             rc = iterate_crypto_once (h, inbuf, len, blocksize,
 635                                       STATUS_ENCRYPT);
 636         }
 637     }
 638
 639   pthread_cleanup_pop (rc ? 1 : 0);             /* inbuf */
 640   pthread_cleanup_pop (1);                      /* tmpkey */
 641   pthread_cleanup_pop (rc && free_iv ? 1 : 0);  /* iv */
 642   pthread_cleanup_pop (1);                      /* cipher */
 643   *result = rc ? NULL : inbuf;
 644   *result_len = len;
 645   return rc;
 646 }
 647
 648 void
 649 cleanup_save (struct save_s *save)
 650 {
 651   if (!save)
 652     return;
 653
 654 #ifdef WITH_AGENT
 655   if (save->pkey)
 656     gcry_sexp_release (save->pkey);
 657
 658   if (save->sigpkey)
 659     gcry_sexp_release (save->sigpkey);
 660 #endif
 661
 662   memset (save, 0, sizeof (struct save_s));
 663 }
 664
 665 /* Keep the agent ctx to retain pinentry options which will be freed in
 666  * cleanup_cb(). Also keep .pubkey since it may be needed for a SAVE. */
 667 void
 668 cleanup_crypto_stage1 (struct crypto_s *cr)
 669 {
 670   if (!cr)
 671     return;
 672
 673   cleanup_save (&cr->save);
 674
 675 #ifdef WITH_AGENT
 676   if (cr->ciphertext_sexp)
 677     gcry_sexp_release (cr->ciphertext_sexp);
 678
 679   cr->ciphertext_sexp = NULL;
 680 #endif
 681
 682   gcry_free (cr->plaintext);
 683   xfree (cr->ciphertext);
 684   xfree (cr->filename);
 685   cr->filename = NULL;
 686   cr->ciphertext = NULL;
 687   cr->ciphertext_len = 0;
 688   cr->plaintext = NULL;
 689   cr->plaintext_len = 0;
 690 }
 691
 692 void
 693 cleanup_crypto_stage2 (struct crypto_s *cr)
 694 {
 695   if (!cr)
 696     return;
 697
 698   cleanup_crypto_stage1 (cr);
 699   set_header_defaults (&cr->hdr);
 700 }
 701
 702 void
 703 cleanup_crypto (struct crypto_s **c)
 704 {
 705   struct crypto_s *cr = *c;
 706
 707   if (!cr)
 708     return;
 709
 710   cleanup_crypto_stage2 (cr);
 711
 712 #ifdef WITH_AGENT
 713   if (cr->pkey_sexp)
 714     gcry_sexp_release (cr->pkey_sexp);
 715
 716   if (cr->sigpkey_sexp)
 717     gcry_sexp_release (cr->sigpkey_sexp);
 718
 719   if (cr->agent)
 720     cleanup_agent (cr->agent);
 721 #endif
 722
 723   xfree (cr);
 724   *c = NULL;
 725 }
 726
 727 gpg_error_t
 728 init_client_crypto (struct crypto_s **crypto)
 729 {
 730   struct crypto_s *new = xcalloc (1, sizeof (struct crypto_s));
 731   gpg_error_t rc;
 732
 733   if (!new)
 734     {
 735       rc = GPG_ERR_ENOMEM;
 736       return rc;
 737     }
 738
 739 #ifdef WITH_AGENT
 740   if (use_agent)
 741     {
 742       rc = agent_init (&new->agent);
 743       if (!rc)
 744         {
 745           rc = send_agent_common_options (new->agent);
 746           if (!rc)
 747             rc = agent_set_pinentry_options (new->agent);
 748         }
 749
 750       if (rc)
 751         {
 752           cleanup_agent (new->agent);
 753           xfree (new);
 754           return rc;
 755         }
 756     }
 757 #endif
 758
 759   set_header_defaults (&new->hdr);
 760   *crypto = new;
 761   return 0;
 762 }
 763
 764 static gpg_error_t
 765 try_decrypt (assuan_context_t ctx, int inquire, struct crypto_s *crypto,
 766              const char *filename, char **key, size_t *keylen)
 767 {
 768   gpg_error_t rc;
 769   int pin_try = 1;
 770   int pin_tries = 3;
 771   char *pin_title = NULL;
 772   struct client_s *client = ctx ? assuan_get_pointer (ctx) : NULL;
 773
 774   do
 775     {
 776       rc = decrypt_common (ctx, inquire, crypto, filename, key, keylen);
 777       if (gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE && ctx)
 778         {
 779           if (pin_try == 1)
 780             pin_title = client->pinentry_opts.title;
 781
 782           client->pinentry_opts.title = str_asprintf (_ ("Bad passphrase (try %i of %i)"), pin_try+1, pin_tries);
 783         }
 784     }
 785   while (!inquire && gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE
 786          && ++pin_try <= pin_tries);
 787
 788   if (ctx && pin_title != client->pinentry_opts.title)
 789     {
 790       xfree (client->pinentry_opts.title);
 791       client->pinentry_opts.title = pin_title;
 792     }
 793
 794   return rc;
 795 }
 796
 797 gpg_error_t
 798 export_common (assuan_context_t ctx, int inquire, struct crypto_s * crypto,
 799                const void *data, size_t datalen, const char *outfile,
 800                const char *keyfile, void **rkey, size_t *rkeylen,
 801                int use_cache, int force)
 802 {
 803   gpg_error_t rc = 0;
 804   void *enc_xml = NULL;
 805   size_t enc_xml_len = 0;
 806   unsigned char *iv = NULL;
 807   size_t iv_len = 0;
 808   int algo = cipher_to_gcrypt (crypto->save.hdr.flags);
 809   void *key = NULL, *salted_key = NULL;
 810   size_t keysize, keylen;
 811   int cached = 0;
 812
 813   rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL, &keysize);
 814   if (rc)
 815     return rc;
 816
 817   if (keyfile)
 818     {
 819       int fd;
 820       unsigned char *buf;
 821       size_t len;
 822       struct stat st;
 823
 824       if (stat (keyfile, &st) == -1)
 825           return gpg_error_from_syserror ();
 826
 827       buf = gcry_malloc (st.st_size);
 828       if (!buf)
 829         return GPG_ERR_ENOMEM;
 830
 831       fd = open (keyfile, O_RDONLY);
 832       if (fd == -1)
 833         rc = gpg_error_from_syserror ();
 834       else
 835         {
 836           len = read (fd, buf, st.st_size);
 837           if (len != st.st_size)
 838             rc = GPG_ERR_TOO_SHORT;
 839         }
 840
 841       if (fd != -1)
 842         close (fd);
 843
 844       key = buf;
 845       keylen = st.st_size;
 846       log_write (_("Using passphrase obtained from file '%s'"), keyfile);
 847
 848       if (!keylen)
 849         {
 850           char *tmp;
 851
 852           gcry_free (key);
 853           tmp = gcry_malloc (1);
 854           *tmp = 0;
 855           key = tmp;
 856           keylen++;
 857         }
 858     }
 859   else
 860     {
 861       if (use_cache)
 862         {
 863           cache_lock ();
 864           cached = cache_iscached (outfile, NULL) == 0;
 865           if (cached)
 866             {
 867               struct cache_data_s *cdata = cache_get_data_filename (outfile);
 868
 869               salted_key = gcry_malloc (cdata->keylen);
 870               if (salted_key)
 871                 {
 872                   memcpy (salted_key, cdata->key, cdata->keylen);
 873                   keysize = cdata->keylen;
 874                 }
 875               else
 876                 rc = GPG_ERR_ENOMEM;
 877             }
 878
 879           cache_unlock ();
 880         }
 881
 882       if (!rc && !cached)
 883         {
 884           if (force) // SAVE
 885             {
 886               struct crypto_s *tmp = NULL;
 887               gpg_error_t rc = init_client_crypto (&tmp);
 888
 889               if (!rc)
 890                 {
 891                   rc = read_data_file (outfile, tmp);
 892                   if (!rc)
 893                     {
 894                       rc = try_decrypt (ctx, inquire, tmp, outfile,
 895                                         (char **)&key, &keylen);
 896                       if (rc)
 897                         gcry_free (key);
 898                     }
 899                 }
 900
 901               cleanup_crypto (&tmp);
 902               if (rc && gpg_err_code (rc) == GPG_ERR_ENOENT)
 903                 use_cache = 0;
 904               else if (rc)
 905                 return rc;
 906             }
 907
 908           if (!use_cache) // PASSWD or new file
 909             {
 910               gcry_free (key);
 911               if (inquire)
 912                 {
 913                   rc = inquire_passphrase (ctx, "NEW_PASSPHRASE",
 914                                            (unsigned char **)&key, &keylen);
 915                 }
 916               else
 917                 {
 918                   rc = getpin_common (ctx, outfile, PINENTRY_SAVE,
 919                                       (char **)&key, &keylen);
 920                 }
 921
 922               if (rc)
 923                 return rc;
 924             }
 925           else
 926             {
 927               salted_key = key;
 928               keysize = keylen;
 929               cached = 1;
 930             }
 931         }
 932     }
 933
 934   if (!rc && !cached)
 935     {
 936       rc = hash_key (algo, crypto->save.hdr.salt,
 937                      sizeof(crypto->save.hdr.salt), key, keylen, &salted_key,
 938                      &keysize);
 939       gcry_free (key);
 940     }
 941
 942   if (!rc)
 943       rc = encrypt_xml (ctx, salted_key, keysize, algo, data, datalen,
 944                         &enc_xml, &enc_xml_len, &iv, &iv_len,
 945                         crypto->save.hdr.iterations);
 946
 947   if (!rc)
 948     {
 949       memcpy (crypto->save.hdr.iv, iv, iv_len);
 950       xfree (iv);
 951       crypto->save.hdr.datalen = enc_xml_len;
 952       rc = write_file (crypto, outfile, enc_xml, enc_xml_len, NULL, 0, NULL,
 953                        NULL);
 954       gcry_free (enc_xml);
 955       if (!rc)
 956         {
 957           *rkey = salted_key;
 958           *rkeylen = keysize;
 959           memcpy (&crypto->hdr, &crypto->save.hdr, sizeof (file_header_t));
 960         }
 961     }
 962
 963   if (rc)
 964     gcry_free (salted_key);
 965
 966   return rc;
 967 }
 968
 969 #ifdef WITH_LIBACL
 970 static void
 971 cleanup_acl (void *arg)
 972 {
 973   acl_t acl = *(acl_t *) arg;
 974
 975   if (acl)
 976     acl_free (acl);
 977 }
 978 #endif
 979
 980 static gpg_error_t
 981 write_header (struct crypto_s *crypto, int fd)
 982 {
 983   ssize_t len;
 984   uint64_t n, x;
 985   uint32_t i;
 986
 987 #ifdef WORDS_BIGENDIAN
 988   len = write (fd, &crypto->save.hdr.magic, sizeof(crypto->save.hdr.magic));
 989   if (len == -1)
 990     goto done;
 991
 992   len = write (fd, &crypto->save.hdr.version, sizeof(crypto->save.hdr.version));
 993   if (len == -1)
 994     goto done;
 995
 996   len = write (fd, &crypto->save.hdr.iterations,
 997                sizeof(crypto->save.hdr.iterations));
 998   if (len == -1)
 999     goto done;
1000
1001   len = write (fd, &crypto->save.hdr.flags, sizeof(crypto->save.hdr.flags));
1002   if (len == -1)
1003     goto done;
1004
1005   len = write (fd, &crypto->save.hdr.iv, sizeof(crypto->save.hdr.iv));
1006   if (len == -1)
1007     goto done;
1008
1009   len = write (fd, &crypto->save.hdr.salt, sizeof(crypto->save.hdr.salt));
1010   if (len == -1)
1011     goto done;
1012
1013   len = write (fd, &crypto->save.hdr.datalen, sizeof(crypto->save.hdr.datalen));
1014   if (len == -1)
1015     goto done;
1016 #else
1017   len = write (fd, &crypto->save.hdr.magic, sizeof(crypto->save.hdr.magic));
1018   if (len == -1)
1019     goto done;
1020
1021   i = htonl (crypto->save.hdr.version);
1022   len = write (fd, &i, sizeof(i));
1023   if (len == -1)
1024     goto done;
1025
1026   n = crypto->save.hdr.iterations;
1027   x = (((uint64_t) htonl (n)) << 32) + htonl (n >> 32);
1028   len = write (fd, &x, sizeof(x));
1029   if (len == -1)
1030     goto done;
1031
1032   n = crypto->save.hdr.flags;
1033   x = (((uint64_t) htonl (n)) << 32) + htonl (n >> 32);
1034   len = write (fd, &x, sizeof(x));
1035   if (len == -1)
1036     goto done;
1037
1038   len = write (fd, &crypto->save.hdr.iv, sizeof(crypto->save.hdr.iv));
1039   if (len == -1)
1040     goto done;
1041
1042   len = write (fd, &crypto->save.hdr.salt, sizeof(crypto->save.hdr.salt));
1043   if (len == -1)
1044     goto done;
1045
1046   i = htonl (crypto->save.hdr.datalen);
1047   len = write (fd, &i, sizeof(i));
1048   if (len == -1)
1049     goto done;
1050 #endif
1051
1052  done:
1053   return len == -1 ? gpg_error_from_syserror () : 0;
1054 }
1055
1056 gpg_error_t
1057 write_file (struct crypto_s *crypto, const char *filename,
1058             void *data, size_t data_len, void *sexp, size_t sexp_len,
1059             void *pubkey, void *sigpkey)
1060 {
1061   char tmp[FILENAME_MAX] = { 0 };
1062   mode_t mode = 0;
1063   struct stat st;
1064   int fd;
1065   gpg_error_t rc = 0;
1066   size_t len;
1067 #ifdef WITH_LIBACL
1068   acl_t acl = NULL;
1069 #endif
1070
1071   if (filename)
1072     {
1073       if (lstat (filename, &st) == 0)
1074         {
1075           mode = st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
1076
1077           if (!(mode & S_IWUSR))
1078             return GPG_ERR_EACCES;
1079         }
1080       else if (errno != ENOENT)
1081         return gpg_error_from_syserror ();
1082
1083       snprintf (tmp, sizeof (tmp), "%s.XXXXXX", filename);
1084       fd = mkstemp (tmp);
1085       if (fd == -1)
1086         {
1087           rc = gpg_error_from_syserror ();
1088           log_write ("%s: %s", tmp, pwmd_strerror (rc));
1089           return rc;
1090         }
1091     }
1092   else
1093     {
1094       // xml_import() or convert_file() from command line.
1095       fd = STDOUT_FILENO;
1096     }
1097
1098   pthread_cleanup_push (cleanup_unlink_cb, tmp);
1099   crypto->save.hdr.version = VERSION_HEX;
1100   rc = write_header (crypto, fd);
1101   if (!rc)
1102     {
1103       if (crypto->save.hdr.flags & PWMD_FLAG_PKCS)
1104         {
1105           unsigned char grip[20];
1106
1107           gcry_pk_get_keygrip ((gcry_sexp_t) pubkey, grip);
1108           len = write (fd, grip, sizeof (grip));
1109           if (len == sizeof (grip))
1110             {
1111               gcry_pk_get_keygrip ((gcry_sexp_t) sigpkey, grip);
1112               len = write (fd, grip, sizeof (grip));
1113               if (len == sizeof (grip))
1114                 {
1115                   len = write (fd, data, data_len);
1116                   if (len == data_len)
1117                     {
1118                       len = write (fd, sexp, sexp_len);
1119                       if (len != sexp_len)
1120                         rc = gpg_error_from_syserror ();
1121                     }
1122                   else
1123                     rc = gpg_error_from_syserror ();
1124                 }
1125             }
1126           else
1127             rc = gpg_error_from_syserror ();
1128         }
1129       else
1130         {
1131           len = write (fd, data, data_len);
1132           if (len != data_len)
1133             rc = gpg_error_from_syserror ();
1134         }
1135     }
1136
1137 #ifdef WITH_LIBACL
1138   pthread_cleanup_push (cleanup_acl, &acl);
1139 #endif
1140   if (!rc)
1141     {
1142       if (fsync (fd) != -1)
1143         {
1144           if (filename && close (fd) != -1)
1145             {
1146 #ifdef WITH_LIBACL
1147               acl = acl_get_file (filename, ACL_TYPE_ACCESS);
1148               if (!acl && errno == ENOENT)
1149                 acl = acl_get_file (".", ACL_TYPE_DEFAULT);
1150               if (!acl)
1151                 log_write ("ACL: %s: %s", filename,
1152                            pwmd_strerror (gpg_error_from_syserror ()));
1153 #endif
1154
1155               if (mode && config_get_boolean (filename, "backup"))
1156                 {
1157                   char tmp2[FILENAME_MAX];
1158
1159                   snprintf (tmp2, sizeof (tmp2), "%s.backup", filename);
1160                   if (rename (filename, tmp2) == -1)
1161                     rc = gpg_error_from_syserror ();
1162                 }
1163             }
1164           else if (filename)
1165             rc = gpg_error_from_syserror ();
1166         }
1167       else
1168         rc = gpg_error_from_syserror ();
1169     }
1170
1171   if (!rc)
1172     {
1173       if (filename && rename (tmp, filename) != -1)
1174         {
1175           tmp[0] = 0;
1176           if (filename && mode)
1177             chmod (filename, mode);
1178
1179 #ifdef WITH_LIBACL
1180           if (acl && acl_set_file (filename, ACL_TYPE_ACCESS, acl))
1181             log_write ("ACL: %s: %s", filename,
1182                        pwmd_strerror (gpg_error_from_syserror ()));
1183 #endif
1184         }
1185       else
1186         rc = gpg_error_from_syserror ();
1187     }
1188
1189 #ifdef WITH_LIBACL
1190   pthread_cleanup_pop (1);
1191 #endif
1192   pthread_cleanup_pop (rc ? 1 : 0);     // unlink
1193   return rc;
1194 }
1195
1196 gpg_error_t
1197 hash_key (int algo, unsigned char *salt, size_t salt_len, const void *key,
1198           size_t keylen, void **result, size_t *rlen)
1199 {
1200   gpg_error_t rc;
1201   void *tmp;
1202
1203   /* Be sure the algorithm is available. */
1204   rc = gcry_cipher_algo_info (algo, GCRYCTL_GET_KEYLEN, NULL, rlen);
1205   if (rc)
1206     return rc;
1207
1208   /* Always allocate enough for a 256-bit key although the algorithms
1209      themselves may use less. Fixes SAVE --cipher with a different
1210      keylen than the previously saved cipher when cached. */
1211   *rlen = 32;
1212   tmp = xmalloc (*rlen);
1213   if (!tmp)
1214     return GPG_ERR_ENOMEM;
1215
1216   rc = gcry_kdf_derive(key, keylen, GCRY_KDF_ITERSALTED_S2K, GCRY_MD_SHA1,
1217                        salt, salt_len, DEFAULT_KDFS2K_ITERATIONS, *rlen, tmp);
1218   if (!rc)
1219     *result = tmp;
1220   else
1221     xfree (tmp);
1222
1223   return rc;
1224 }
1225
1226 gpg_error_t
1227 change_passwd (assuan_context_t ctx, const char *filename, int inquire,
1228                struct crypto_s **rcrypto)
1229 {
1230   unsigned char *key = NULL;
1231   size_t keylen = 0;
1232   struct crypto_s *crypto = NULL;
1233   gpg_error_t rc = init_client_crypto (&crypto);
1234
1235   if (rc)
1236     return rc;
1237
1238   crypto->client_ctx = ctx;
1239   rc = read_data_file (filename, crypto);
1240   if (rc)
1241     {
1242       cleanup_crypto (&crypto);
1243       return rc;
1244     }
1245
1246   rc = try_decrypt (ctx, inquire, crypto, filename, (char **)&key, &keylen);
1247   if (rc)
1248     {
1249       cleanup_crypto (&crypto);
1250       return rc;
1251     }
1252
1253   if (!rc)
1254     {
1255       memcpy (&crypto->save.hdr, &crypto->hdr, sizeof (file_header_t));
1256       rc = export_common (ctx, inquire, crypto, crypto->plaintext,
1257                           crypto->plaintext_len, crypto->filename, NULL,
1258                           (void **)&key, &keylen, 0, 0);
1259     }
1260
1261   if (!rc)
1262     {
1263       int cached;
1264
1265       rc = save_common (filename, crypto, crypto->plaintext,
1266                         crypto->plaintext_len, key, keylen, &cached, 1);
1267       if (!rc)
1268         *rcrypto = crypto;
1269     }
1270
1271   if (rc)
1272     {
1273       gcry_free (key);
1274       cleanup_crypto (&crypto);
1275     }
1276
1277   return rc;
1278 }
1279
1280 // FIXME gcry_sexp_t is updated in cdata. make a temp var in case of failure.
1281 gpg_error_t
1282 save_common (const char *filename, struct crypto_s *crypto,
1283              const unsigned char *data, size_t datalen,
1284              const unsigned char *key, size_t keylen, int *cached, int no_agent)
1285 {
1286   struct cache_data_s *cdata;
1287   gpg_error_t rc;
1288
1289   /* This is safe since it is a fast operation. */
1290   cache_lock ();
1291   pthread_cleanup_push (cleanup_cache_mutex, NULL);
1292   cdata = cache_get_data_filename (filename);
1293   *cached = cdata != NULL;
1294
1295   if (!cdata)
1296     cdata = xcalloc (1, sizeof (struct cache_data_s));
1297
1298 #ifdef WITH_AGENT
1299   if (use_agent && !no_agent)
1300     {
1301       /* Update in case of any --keygrip argument */
1302       if (cdata->pubkey)
1303         gcry_sexp_release (cdata->pubkey);
1304
1305       gcry_sexp_build ((gcry_sexp_t *) & cdata->pubkey, NULL, "%S",
1306                        crypto->pkey_sexp);
1307
1308       if (cdata->sigkey)
1309         gcry_sexp_release (cdata->sigkey);
1310
1311       gcry_sexp_build ((gcry_sexp_t *) & cdata->sigkey, NULL, "%S",
1312                        crypto->sigpkey_sexp);
1313     }
1314 #endif
1315
1316   gcry_free (cdata->doc);
1317   cdata->doc = NULL;
1318   cdata->key = (unsigned char *)key;
1319   cdata->keylen = keylen;
1320   rc = encrypt_xml (NULL, cache_key, cache_keysize, GCRY_CIPHER_AES, data,
1321                     datalen, &cdata->doc, &cdata->doclen, &cache_iv,
1322                     &cache_blocksize, 0);
1323   if (!rc)
1324     {
1325       unsigned char md5file[16];
1326
1327       gcry_md_hash_buffer (GCRY_MD_MD5, md5file, filename, strlen (filename));
1328       rc = cache_set_data (md5file, cdata, crypto->grip);
1329     }
1330
1331   pthread_cleanup_pop (1);      // mutex unlock
1332   return rc;
1333 }
1334
1335 gpg_error_t
1336 getpin_common (assuan_context_t ctx, const char *filename, int which,
1337                char **rkey, size_t *rkeylen)
1338 {
1339   gpg_error_t rc;
1340   struct client_s *client = ctx ? assuan_get_pointer (ctx) : NULL;
1341   struct pinentry_s *pin = pinentry_init (filename);
1342
1343   if (!pin)
1344     return GPG_ERR_ENOMEM;
1345
1346   if (client)
1347     pinentry_merge_options (&pin->pinentry_opts, &client->pinentry_opts);
1348
1349   rc = pinentry_lock (ctx, pin);
1350   if (!rc)
1351     rc = pinentry_getpin (pin, rkey, which);
1352
1353   pinentry_deinit (pin);
1354   if (rc)
1355     return rc;
1356
1357   *rkeylen = strlen (*rkey);
1358   if (!(*rkeylen))
1359     (*rkeylen)++;
1360
1361   return rc;
1362 }
1363
1364 /* Note: 'key' is freed with gcry_free() and not xfree(). Although
1365  * both call xfree(). */
1366 gpg_error_t
1367 inquire_passphrase (assuan_context_t ctx, const char *keyword,
1368                     unsigned char **result, size_t *rlen)
1369 {
1370   gpg_error_t rc;
1371
1372   assuan_begin_confidential (ctx);
1373   rc = assuan_inquire (ctx, keyword, result, rlen, 0);
1374   assuan_end_confidential (ctx);
1375   return rc;
1376 }
1377
1378 gpg_error_t
1379 decrypt_common (assuan_context_t ctx, int inquire, struct crypto_s *crypto,
1380                 const char *filename, char **rkey, size_t *rkeylen)
1381 {
1382   char *key = NULL;
1383   size_t keylen = 0;
1384   gpg_error_t rc = read_data_file (filename, crypto);
1385   int algo = cipher_to_gcrypt (crypto->hdr.flags);
1386   void *salted_key = NULL;
1387   size_t keysize = 0;
1388
1389   if (rc)
1390     {
1391       log_write ("ERR %i: %s", rc, pwmd_strerror (rc));
1392       return rc;
1393     }
1394
1395   key = config_get_string (filename, "passphrase");
1396   if (key)
1397     {
1398       log_write (_("Trying the passphrase specified in config ..."));
1399       keylen = strlen (key);
1400     }
1401
1402   if (!key)
1403     {
1404       key = config_get_string (filename, "passphrase_file");
1405       if (key)
1406         {
1407           char *tmp = expand_homedir (key);
1408           int fd;
1409           struct stat st;
1410
1411           xfree (key);
1412           key = tmp;
1413           log_write (_("Trying the passphrase using file '%s' ..."), key);
1414           fd = open (key, O_RDONLY);
1415           if (fd == -1)
1416             {
1417               rc = gpg_error_from_syserror ();
1418               log_write ("%s: %s", key, pwmd_strerror (rc));
1419               xfree (key);
1420               return rc;
1421             }
1422
1423           stat (key, &st);
1424           xfree (key);
1425           key = xmalloc (st.st_size);
1426           if (key)
1427             {
1428               if (read (fd, key, st.st_size) != st.st_size)
1429                 {
1430                   log_write ("short read() count");
1431                   rc = GPG_ERR_TOO_SHORT;
1432                 }
1433             }
1434           else
1435             rc = GPG_ERR_ENOMEM;
1436
1437           close (fd);
1438
1439           if (rc)
1440             {
1441               log_write ("%s", pwmd_strerror (rc));
1442               xfree (key);
1443               return rc;
1444             }
1445
1446           keylen = st.st_size;
1447           if (!keylen)
1448             {
1449               tmp = xmalloc (1);
1450               *tmp = 0;
1451               xfree (key);
1452               key = tmp;
1453               keylen++;
1454             }
1455         }
1456     }
1457
1458   if (!key && !IS_PKCS (crypto) && inquire)
1459     {
1460       rc = inquire_passphrase (ctx, "PASSPHRASE", (unsigned char **)&key,
1461                                &keylen);
1462       if (rc)
1463         {
1464           log_write ("ERR %i: %s", rc, pwmd_strerror (rc));
1465           return rc;
1466         }
1467
1468       if (!keylen)
1469         keylen++;
1470     }
1471   else if (!key && !IS_PKCS (crypto))
1472     {
1473       rc = getpin_common (ctx, filename, PINENTRY_OPEN, &key, &keylen);
1474       if (rc)
1475         {
1476           log_write ("%s", pwmd_strerror (rc));
1477           return rc;
1478         }
1479     }
1480 #ifdef WITH_AGENT
1481   else if (key && IS_PKCS (crypto))
1482     {
1483       rc = set_agent_passphrase (crypto, key, keylen);
1484       if (rc)
1485         {
1486           xfree (key);
1487           log_write ("ERR %i: %s", rc, pwmd_strerror (rc));
1488           return rc;
1489         }
1490     }
1491 #endif
1492
1493   if (key && !IS_PKCS (crypto))
1494     {
1495       rc = hash_key (algo, crypto->hdr.salt, sizeof(crypto->hdr.salt), key,
1496                      keylen, &salted_key, &keysize);
1497       xfree (key);
1498       key = (char *)salted_key;
1499       keylen = keysize;
1500       if (rc)
1501         {
1502           xfree (salted_key);
1503           return rc;
1504         }
1505     }
1506
1507   xfree (crypto->filename);
1508   crypto->filename = str_dup (filename);
1509   rc = decrypt_data (ctx, crypto, (unsigned char *)key, keylen);
1510   if (rc)
1511     {
1512       log_write ("ERR %i: %s", rc, pwmd_strerror (rc));
1513       xfree (key);
1514     }
1515   else
1516     {
1517       *rkey = key;
1518       *rkeylen = keylen;
1519     }
1520
1521   return rc;
1522 }