src/crypto.c

   1 /*
   2     Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015,
   3     2016
   4     Ben Kibbey <bjk@luxsci.net>
   5
   6     This file is part of pwmd.
   7
   8     Pwmd is free software: you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation, either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     Pwmd is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with Pwmd.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30
  31 #ifdef WITH_LIBACL
  32 #include <sys/acl.h>
  33 #endif
  34
  35 #include "pwmd-error.h"
  36 #include "util-misc.h"
  37 #include "common.h"
  38 #include "rcfile.h"
  39 #include "crypto.h"
  40 #include "cache.h"
  41 #include "mem.h"
  42 #include "util-string.h"
  43 #include "rcfile.h"
  44
  45 static int keepalive;
  46
  47 #define BUFSIZE 4096
  48
  49 #define STATUS_TIMEOUT_INIT(crypto) \
  50   do { \
  51       crypto->status_timeout = time (NULL); \
  52       crypto->progress_rc = 0; \
  53   } while (0)
  54
  55 #define STATUS_TIMEOUT_TEST(crypto, rc, s, line) \
  56   do { \
  57       time_t now = time (NULL); \
  58       if (now - crypto->status_timeout >= keepalive && crypto->client_ctx) { \
  59         rc = send_status (crypto->client_ctx, s, line); \
  60         crypto->status_timeout = now; \
  61       } \
  62   } while (0)
  63
  64 #if 0
  65 static gpgme_error_t
  66 show_key_output (gpgme_key_t key)
  67 {
  68   gpgme_subkey_t keyp; // first is primary
  69
  70   for (keyp = key->subkeys; keyp; keyp = keyp->next)
  71     {
  72       fprintf(stderr, "keyid: %s, revoked: %i, expired: %i, disabled: %i, invalid: %i,"
  73               "encrypt: %i, sign: %i, cert: %i, auth: %i, secret: %i\n",
  74               keyp->keyid, keyp->revoked, keyp->expired, keyp->disabled,
  75               keyp->invalid, keyp->can_encrypt, keyp->can_sign,
  76               keyp->can_certify, keyp->can_authenticate, keyp->secret);
  77     }
  78
  79   return 0;
  80 }
  81 #endif
  82
  83 static gpg_error_t
  84 get_password (const char *keyfile, unsigned char **result, size_t *len)
  85 {
  86   struct stat st;
  87   int fd;
  88   unsigned char *buf = NULL;
  89   gpg_error_t rc = 0;
  90
  91   log_write (_ ("obtaining passphrase from passphrase file"));
  92   if (stat (keyfile, &st) == -1)
  93     return gpg_error_from_syserror ();
  94
  95   fd = open (keyfile, O_RDONLY);
  96   if (fd == -1)
  97     return gpg_error_from_syserror ();
  98
  99   buf = xmalloc (st.st_size+1);
 100   if (buf)
 101     {
 102       size_t rlen = read (fd, buf, st.st_size);
 103
 104       if (rlen != st.st_size)
 105         rc = GPG_ERR_ASS_READ_ERROR;
 106       else
 107         {
 108           buf[rlen] = 0;
 109           if (rlen && strlen ((char *)buf) != rlen)
 110             rc = GPG_ERR_INV_PASSPHRASE;
 111
 112           if (!rc)
 113             {
 114               *result = buf;
 115               *len = rlen;
 116             }
 117         }
 118     }
 119   else
 120     rc = GPG_ERR_ENOMEM;
 121
 122   close (fd);
 123   if (rc)
 124     xfree (buf);
 125
 126   return rc;
 127 }
 128
 129 static gpgme_error_t
 130 status_cb (void *data, const char *keyword, const char *args)
 131 {
 132   struct crypto_s *crypto = data;
 133
 134   // Cache pushing.
 135   if (!crypto->client_ctx)
 136     return 0;
 137
 138   if (!strcmp (keyword, "INQUIRE_MAXLEN") &&
 139       (crypto->flags & CRYPTO_FLAG_KEYFILE))
 140     return 0;
 141
 142   return assuan_write_status (crypto->client_ctx, keyword, args);
 143 }
 144
 145 static gpgme_error_t
 146 passphrase_cb (void *data, const char *hint, const char *info, int bad, int fd)
 147 {
 148   struct crypto_s *crypto = data;
 149   unsigned char *result = NULL;
 150   size_t len;
 151   gpg_error_t rc = 0;
 152
 153   if (crypto->flags & CRYPTO_FLAG_KEYFILE)
 154     rc = get_password (crypto->keyfile, &result, &len);
 155   else
 156     {
 157       if (hint)
 158         rc = assuan_write_status (crypto->client_ctx, "PASSPHRASE_HINT", hint);
 159
 160       if (!rc && info)
 161         rc = assuan_write_status (crypto->client_ctx, "PASSPHRASE_INFO", info);
 162
 163       if (!rc)
 164         {
 165           char *keyword = "PASSPHRASE";
 166
 167           /* FIXME: how to handle multiple signers */
 168           if (!bad && crypto->flags & CRYPTO_FLAG_PASSWD_SIGN)
 169               keyword = "SIGN_PASSPHRASE";
 170           else if (!bad && crypto->flags & CRYPTO_FLAG_PASSWD_NEW)
 171             {
 172               crypto->flags |= CRYPTO_FLAG_PASSWD_SIGN;
 173               keyword = "NEW_PASSPHRASE";
 174             }
 175           else if (!bad && crypto->flags & CRYPTO_FLAG_PASSWD)
 176             crypto->flags |= CRYPTO_FLAG_PASSWD_NEW;
 177           else if (!bad && crypto->flags & CRYPTO_FLAG_NEWFILE)
 178             {
 179               keyword = "NEW_PASSPHRASE";
 180               if (crypto->save.sigkey)
 181                 crypto->flags |= CRYPTO_FLAG_PASSWD_SIGN;
 182             }
 183
 184           rc = assuan_inquire (crypto->client_ctx, keyword, &result, &len, 0);
 185         }
 186     }
 187
 188   if (!rc)
 189     {
 190       pthread_cleanup_push ((void *)xfree, result);
 191
 192       if (!len)
 193         gpgme_io_writen (fd, "\n", 1);
 194       else
 195         {
 196           int nl = result[len-1] == '\n';
 197           int ret;
 198
 199           ret = gpgme_io_writen (fd, result, len);
 200           if (!ret && !nl)
 201             gpgme_io_writen (fd, "\n", 1);
 202           else if (ret)
 203             rc = GPG_ERR_CANCELED;
 204         }
 205
 206       pthread_cleanup_pop (1);
 207     }
 208
 209   return rc;
 210 }
 211
 212 static void
 213 progress_cb (void *data, const char *what, int type, int current, int total)
 214 {
 215   struct crypto_s *crypto = data;
 216
 217   crypto->progress_rc = send_status (crypto->client_ctx, STATUS_GPGME,
 218                                      "%s %i %i %i", what, type, current, total);
 219 }
 220
 221 gpgme_error_t
 222 crypto_data_to_buf (const gpgme_data_t data, unsigned char **result,
 223                     size_t *rlen)
 224 {
 225   off_t ret = gpgme_data_seek (data, 0, SEEK_SET);
 226   gpgme_error_t rc;
 227   size_t total = 0, size = BUFSIZE;
 228   unsigned char *buf;
 229
 230   if (ret == -1)
 231     return gpg_error_from_syserror ();
 232
 233   buf = xmalloc (size);
 234   if (!buf)
 235     return GPG_ERR_ENOMEM;
 236
 237   do
 238     {
 239       pthread_cleanup_push ((void *)xfree, buf);
 240       ret = gpgme_data_read (data, &buf[total], BUFSIZE);
 241       pthread_cleanup_pop (0);
 242       if (ret > 0)
 243         {
 244           unsigned char *p;
 245
 246           total += ret;
 247           size += BUFSIZE;
 248           p = xrealloc (buf, size * sizeof(char));
 249           if (!p)
 250             {
 251               xfree (buf);
 252               return GPG_ERR_ENOMEM;
 253             }
 254
 255           buf = p;
 256         }
 257     } while (ret > 0);
 258
 259   if (ret == -1)
 260     {
 261       rc = gpgme_err_code_from_syserror ();
 262       xfree (buf);
 263       return rc;
 264     }
 265
 266   *result = buf;
 267   *rlen = total;
 268   return 0;
 269 }
 270
 271 static void
 272 crypto_cancel_gpgme (void *data)
 273 {
 274   struct crypto_s *crypto = data;
 275   struct client_s *client = assuan_get_pointer (crypto->client_ctx);
 276   gpgme_error_t rc = 0;
 277
 278   if (client)
 279     update_client_state (client, CLIENT_STATE_DISCON);
 280
 281   gpgme_cancel_async (crypto->ctx);
 282   while (!gpgme_wait (crypto->ctx, &rc, 0) && !rc && client->thd->cancel < 2)
 283     log_write1 (_ ("waiting for gpgme operation to finish"));
 284 }
 285
 286 gpgme_error_t
 287 crypto_list_keys (struct crypto_s *crypto, char *keys[], int secret,
 288                   gpgme_key_t **result)
 289 {
 290   gpgme_error_t rc;
 291   gpgme_key_t key = NULL, *res = NULL;
 292   size_t total = 0;
 293
 294   STATUS_TIMEOUT_INIT (crypto);
 295   rc = gpgme_op_keylist_ext_start (crypto->ctx, (const char **)keys, secret, 0);
 296   if (rc)
 297     return rc;
 298
 299   pthread_cleanup_push ((void *)crypto_cancel_gpgme, crypto);
 300
 301   do
 302     {
 303       gpgme_key_t *p;
 304
 305       pthread_cleanup_push ((void *)crypto_free_key_list, res);
 306       rc = gpgme_op_keylist_next (crypto->ctx, &key);
 307       pthread_cleanup_pop (0);
 308       if (rc && gpgme_err_code(rc) != GPG_ERR_EOF)
 309         break;
 310
 311       if (rc)
 312         {
 313           rc = 0;
 314           break;
 315         }
 316
 317       p = xrealloc (res, (total+2) * sizeof (gpgme_key_t));
 318       if (!p)
 319         {
 320           rc = GPG_ERR_ENOMEM;
 321           break;
 322         }
 323
 324       res = p;
 325       res[total++] = key;
 326       res[total] = NULL;
 327       pthread_cleanup_push ((void *)crypto_free_key_list, res);
 328       STATUS_TIMEOUT_TEST (crypto, rc, STATUS_KEEPALIVE, NULL);
 329       pthread_cleanup_pop (0);
 330     } while (!rc);
 331
 332   pthread_cleanup_pop (0);
 333
 334   if (!rc)
 335     {
 336       rc = gpgme_op_keylist_end (crypto->ctx);
 337       if (!rc)
 338         {
 339           *result = res;
 340           rc = total ? 0 : secret ? GPG_ERR_NO_SECKEY : GPG_ERR_NO_PUBKEY;
 341         }
 342     }
 343   else
 344     crypto_free_key_list (res);
 345
 346   return rc;
 347 }
 348
 349 void
 350 crypto_free_save (struct save_s *save)
 351 {
 352   if (!save)
 353     return;
 354
 355   strv_free (save->pubkey);
 356   strv_free (save->sigkey);
 357   memset (save, 0, sizeof (struct save_s));
 358 }
 359
 360 static gpg_error_t
 361 crypto_kill_scd ()
 362 {
 363   return cache_kill_scd ();
 364 }
 365
 366 static void
 367 free_gpgme_data_cb (void *data)
 368 {
 369   gpgme_data_t d = data;
 370   char *t;
 371   size_t len;
 372
 373   if (!data)
 374     return;
 375
 376   t = gpgme_data_release_and_get_mem (d, &len);
 377   if (t)
 378     wipememory (t, 0, len);
 379
 380   gpgme_free (t);
 381 }
 382
 383 void
 384 crypto_free_non_keys (struct crypto_s *crypto)
 385 {
 386   if (!crypto)
 387     return;
 388
 389   if (crypto->ctx)
 390     gpgme_release (crypto->ctx);
 391
 392   crypto->ctx = NULL;
 393   xfree (crypto->plaintext);
 394   crypto->plaintext = NULL;
 395   crypto->plaintext_size = 0;
 396
 397   if (crypto->cipher)
 398     free_gpgme_data_cb (crypto->cipher);
 399
 400   crypto->cipher = NULL;
 401   crypto_free_save (&crypto->save);
 402   xfree (crypto->keyfile);
 403   crypto->keyfile = NULL;
 404   crypto->flags &= ~CRYPTO_FLAG_KEYFILE;
 405   (void)crypto_kill_scd ();
 406 }
 407
 408 void
 409 crypto_free (struct crypto_s *crypto)
 410 {
 411   if (!crypto)
 412     return;
 413
 414   crypto_free_non_keys (crypto);
 415   strv_free (crypto->pubkey);
 416   strv_free (crypto->sigkey);
 417   xfree (crypto->filename);
 418   xfree (crypto);
 419 }
 420
 421 gpgme_error_t
 422 crypto_init_ctx (struct crypto_s *crypto, int no_pinentry,
 423                  char *passphrase_file)
 424 {
 425   gpgme_ctx_t ctx;
 426   gpgme_keylist_mode_t keylist_mode;
 427   gpgme_error_t rc;
 428
 429   rc = gpgme_new (&ctx);
 430   if (rc)
 431     return rc;
 432
 433   rc = gpgme_set_protocol (ctx, GPGME_PROTOCOL_OPENPGP);
 434   if (!rc)
 435     {
 436       keylist_mode = gpgme_get_keylist_mode (ctx);
 437       keylist_mode |= GPGME_KEYLIST_MODE_LOCAL|GPGME_KEYLIST_MODE_WITH_SECRET;
 438       rc = gpgme_set_keylist_mode (ctx, keylist_mode);
 439       if (!rc)
 440          {
 441            if (no_pinentry || passphrase_file)
 442              rc = gpgme_set_pinentry_mode (ctx, GPGME_PINENTRY_MODE_LOOPBACK);
 443            else
 444              rc = gpgme_set_pinentry_mode (ctx, GPGME_PINENTRY_MODE_DEFAULT);
 445
 446            if (!rc)
 447              {
 448                gpgme_set_passphrase_cb (ctx, passphrase_cb, crypto);
 449                gpgme_set_progress_cb (ctx, progress_cb, crypto);
 450                gpgme_set_status_cb (ctx, status_cb, crypto);
 451                crypto->ctx = ctx;
 452                crypto->flags = 0;
 453              }
 454
 455            if (passphrase_file)
 456              {
 457                crypto->keyfile = passphrase_file;
 458                crypto->flags |= CRYPTO_FLAG_KEYFILE;
 459              }
 460          }
 461     }
 462
 463   if (rc)
 464     gpgme_release (ctx);
 465
 466   return rc;
 467 }
 468
 469 void
 470 crypto_set_keepalive ()
 471 {
 472   keepalive = config_get_integer ("global", "keepalive_interval");
 473 }
 474
 475 gpg_error_t
 476 crypto_init (struct crypto_s **crypto, void *ctx, const char *filename,
 477              int no_pinentry, char *passphrase_file)
 478 {
 479   struct crypto_s *new = xcalloc (1, sizeof (struct crypto_s));
 480   gpgme_error_t rc;
 481
 482   crypto_set_keepalive ();
 483
 484   if (!new)
 485     return GPG_ERR_ENOMEM;
 486
 487   rc = crypto_init_ctx (new, no_pinentry, passphrase_file);
 488   if (rc)
 489     goto fail;
 490
 491   if (filename)
 492     {
 493       new->filename = str_dup (filename);
 494       if (!new->filename)
 495         {
 496           rc = GPG_ERR_ENOMEM;
 497           goto fail;
 498         }
 499     }
 500
 501   new->client_ctx = ctx;
 502   *crypto = new;
 503   return 0;
 504
 505 fail:
 506   crypto_free (new);
 507   return rc;
 508 }
 509
 510 /* Converts a 40 byte key id to the 16 byte form. Needed for comparison of
 511  * gpgme_recipient_t.keyid. */
 512 gpg_error_t
 513 crypto_keyid_to_16b (char **keys)
 514 {
 515   char **p;
 516
 517   for (p = keys; p && *p; p++)
 518     {
 519       char *t = *p;
 520       size_t len = strlen (t);
 521
 522       if (len < 16)
 523         return GPG_ERR_INV_ARG;
 524
 525       memmove (&t[0], &t[len-16], 16);
 526       t[16] = 0;
 527     }
 528
 529   return 0;
 530 }
 531
 532 gpgme_error_t
 533 crypto_decrypt (struct client_s *client, struct crypto_s *crypto)
 534 {
 535   gpgme_data_t plain;
 536   gpgme_error_t rc;
 537   gpgme_data_t cipher;
 538   int fd;
 539   char **new_recipients = NULL;
 540   char **new_signers = NULL;
 541   char **pp;
 542   gpgme_decrypt_result_t result;
 543
 544   rc = gpgme_data_new (&plain);
 545   if (rc)
 546     return rc;
 547
 548   pthread_cleanup_push ((void *)free_gpgme_data_cb, plain);
 549   fd = open (crypto->filename, O_RDONLY);
 550   if (fd != -1)
 551     {
 552       pthread_cleanup_push ((void *)close_fd_cb, &fd);
 553       rc = gpgme_data_new_from_fd (&cipher, fd);
 554       if (!rc)
 555         {
 556           pthread_cleanup_push ((void *)free_gpgme_data_cb, cipher);
 557           STATUS_TIMEOUT_INIT(crypto);
 558           rc = send_status (client ? client->ctx : NULL, STATUS_DECRYPT, NULL);
 559           if (!rc)
 560             rc = gpgme_op_decrypt_verify_start (crypto->ctx, cipher, plain);
 561
 562           if (!rc)
 563             {
 564               pthread_cleanup_push ((void *)crypto_cancel_gpgme, crypto);
 565
 566               do
 567                 {
 568                   if (!rc && crypto->progress_rc)
 569                     rc = crypto->progress_rc;
 570
 571                   if (!rc)
 572                     STATUS_TIMEOUT_TEST (crypto, rc, STATUS_DECRYPT, NULL);
 573
 574                   if (rc)
 575                     break;
 576                 } while (!gpgme_wait (crypto->ctx, &rc, 0) && !rc);
 577
 578               pthread_cleanup_pop (0); // cancellation
 579             }
 580
 581           pthread_cleanup_pop (1); // free_gpgme_data_cb (cipher)
 582         }
 583
 584       pthread_cleanup_pop (1); // close (fd)
 585     }
 586   else
 587     rc = gpgme_err_code_from_syserror ();
 588
 589   pthread_cleanup_pop (0); // free_gpgme_data_cb (plain)
 590
 591   if (rc)
 592     {
 593       free_gpgme_data_cb (plain);
 594       return rc;
 595     }
 596
 597   pthread_cleanup_push ((void *)free_gpgme_data_cb, plain);
 598   result = gpgme_op_decrypt_result (crypto->ctx);
 599   if (!result->unsupported_algorithm && !result->wrong_key_usage)
 600     {
 601       gpgme_recipient_t r;
 602
 603       for (r = result->recipients; r; r = r->next)
 604         {
 605           pthread_cleanup_push ((void *)strv_free, new_recipients);
 606           log_write1 (_ ("%s: recipient: %s, status=%u"),
 607                       crypto->filename, r->keyid, r->status);
 608           pthread_cleanup_pop (0);
 609           pp = strv_cat(new_recipients, str_dup (r->keyid));
 610           if (!pp)
 611             {
 612               rc = GPG_ERR_ENOMEM;
 613               break;
 614             }
 615
 616           new_recipients = pp;
 617         }
 618     }
 619   else if (result->wrong_key_usage)
 620     rc = GPG_ERR_WRONG_KEY_USAGE;
 621   else if (result->unsupported_algorithm)
 622     rc = GPG_ERR_UNSUPPORTED_ALGORITHM;
 623
 624   if (!rc)
 625     {
 626       gpgme_verify_result_t result;
 627       gpgme_signature_t s;
 628
 629       result = gpgme_op_verify_result (crypto->ctx);
 630
 631       for (s = result->signatures; s; s = s->next)
 632         {
 633           pthread_cleanup_push ((void *)strv_free, new_signers);
 634           log_write1 (_ ("%s: signer: %s, status=%u"),
 635                       crypto->filename, s->fpr, s->status);
 636           pthread_cleanup_pop (0);
 637           if (s->status || s->wrong_key_usage
 638               || !(s->summary & GPGME_SIGSUM_VALID))
 639             continue;
 640
 641           pp = strv_cat (new_signers, str_dup (s->fpr));
 642           if (!pp)
 643             {
 644               rc = GPG_ERR_ENOMEM;
 645               break;
 646             }
 647
 648           new_signers = pp;
 649         }
 650
 651       if (result->signatures && !new_signers)
 652         rc = GPG_ERR_BAD_SIGNATURE;
 653
 654       if (!rc)
 655         {
 656           xfree (crypto->plaintext);
 657           crypto->plaintext = NULL;
 658           crypto->plaintext_size = 0;
 659           pthread_cleanup_push ((void *)strv_free, new_recipients);
 660           pthread_cleanup_push ((void *)strv_free, new_signers);
 661           rc = crypto_data_to_buf (plain, &crypto->plaintext,
 662                                    &crypto->plaintext_size);
 663           pthread_cleanup_pop (0);
 664           pthread_cleanup_pop (0);
 665           if (!rc)
 666             {
 667               strv_free (crypto->pubkey);
 668               crypto->pubkey = new_recipients;
 669               crypto_keyid_to_16b (crypto->pubkey);
 670               strv_free (crypto->sigkey);
 671               crypto->sigkey = new_signers;
 672               crypto_keyid_to_16b (crypto->sigkey);
 673             }
 674         }
 675     }
 676
 677   if (rc)
 678     {
 679       strv_free (new_recipients);
 680       strv_free (new_signers);
 681     }
 682
 683   pthread_cleanup_pop (1); // free_gpgme_data_cb (plain)
 684   return rc;
 685 }
 686
 687 void
 688 crypto_free_key_list (gpgme_key_t *keys)
 689 {
 690   int i;
 691
 692   for (i = 0; keys && keys[i]; i++)
 693     gpgme_key_unref (keys[i]);
 694
 695   xfree (keys);
 696 }
 697
 698 /* Removes strings in 'prune' from 'a'. */
 699 static char **
 700 prune_keys (char **a, char **prune)
 701 {
 702   char **p;
 703
 704   for (p = prune; p && *p; p++)
 705     {
 706       char **ap;
 707
 708       for (ap = a; ap && *ap; ap++)
 709         {
 710           if (!strcmp (*ap, *p))
 711             {
 712               while (*ap)
 713                 {
 714                   *ap = *(ap+1);
 715                   ap++;
 716                 }
 717             }
 718         }
 719     }
 720
 721   return a;
 722 }
 723
 724 static void
 725 remove_duplicates (char **a)
 726 {
 727   char **p;
 728
 729   for (p = a; p && *p; p++)
 730     {
 731       char **t;
 732
 733       for (t = p+1; t && *t; t++)
 734         {
 735           if (!strcmp (*p, *t))
 736             {
 737               char *tmp = *t;
 738
 739               while (*(t+1))
 740                 {
 741                   *t = *(t+1);
 742                   t++;
 743                 }
 744
 745               *t = NULL;
 746               xfree (tmp);
 747               remove_duplicates (a);
 748               return;
 749             }
 750         }
 751     }
 752 }
 753
 754 gpgme_error_t
 755 crypto_encrypt (struct client_s *client, struct crypto_s *crypto)
 756 {
 757   gpgme_error_t rc;
 758   gpgme_data_t cipher = NULL;
 759   gpgme_key_t *keys = NULL;
 760   gpgme_key_t *sigkeys = NULL;
 761
 762   STATUS_TIMEOUT_INIT (crypto);
 763   if (!(crypto->flags & CRYPTO_FLAG_SYMMETRIC))
 764     {
 765       crypto_keyid_to_16b (crypto->save.pubkey);
 766       remove_duplicates (crypto->save.pubkey);
 767       rc = crypto_list_keys (crypto, crypto->save.pubkey, 0, &keys);
 768       if (rc)
 769         return rc;
 770     }
 771
 772   pthread_cleanup_push ((void *)crypto_free_key_list, keys);
 773   rc = gpgme_data_new (&cipher);
 774   pthread_cleanup_push ((void *)free_gpgme_data_cb, cipher);
 775   if (!rc)
 776     rc = gpgme_data_set_file_name (cipher, crypto->filename);
 777
 778   if (!rc && (crypto->save.sigkey
 779               || !(crypto->flags & CRYPTO_FLAG_SYMMETRIC)))
 780     {
 781       crypto_keyid_to_16b (crypto->save.sigkey);
 782       remove_duplicates (crypto->save.sigkey);
 783       rc = crypto_list_keys (crypto, crypto->save.sigkey, 1, &sigkeys);
 784       if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
 785         rc = 0;
 786     }
 787
 788   if (!rc)
 789     {
 790       gpgme_data_t plain = NULL;
 791
 792       pthread_cleanup_push ((void *)crypto_free_key_list, sigkeys);
 793       rc = gpgme_data_new_from_mem (&plain, (char *)crypto->plaintext,
 794                                     crypto->plaintext_size, 0);
 795       pthread_cleanup_push ((void *)free_gpgme_data_cb, plain);
 796       if (!rc)
 797         {
 798           int i;
 799
 800           gpgme_signers_clear (crypto->ctx);
 801
 802           for (i = 0; sigkeys && sigkeys[i]; i++)
 803             gpgme_signers_add (crypto->ctx, sigkeys[i]);
 804
 805           if (!i && !(crypto->flags & CRYPTO_FLAG_SYMMETRIC))
 806             rc = GPG_ERR_NO_SIGNATURE_SCHEME;
 807         }
 808
 809       if (!rc)
 810         {
 811           gpgme_data_set_encoding (cipher, GPGME_DATA_ENCODING_ARMOR);
 812
 813           rc = send_status (client ? client->ctx : NULL, STATUS_ENCRYPT, NULL);
 814           if (!rc)
 815             {
 816               unsigned flags = 0;
 817               int f = config_get_boolean ("global", "encrypt_to");
 818
 819               if (!f)
 820                 flags |= GPGME_ENCRYPT_NO_ENCRYPT_TO;
 821
 822               f = config_get_boolean ("global", "always_trust");
 823               if (f)
 824                 flags |= GPGME_ENCRYPT_ALWAYS_TRUST;
 825
 826               if (!(crypto->flags & CRYPTO_FLAG_SYMMETRIC)
 827                   || (crypto->flags & CRYPTO_FLAG_SYMMETRIC && sigkeys))
 828                 rc = gpgme_op_encrypt_sign_start (crypto->ctx,
 829                                                   (crypto->flags & CRYPTO_FLAG_SYMMETRIC) ? NULL : keys,
 830                                                   flags, plain, cipher);
 831               else
 832                 rc = gpgme_op_encrypt_start (crypto->ctx, NULL, flags,
 833                                              plain, cipher);
 834             }
 835         }
 836
 837       if (!rc)
 838         {
 839           pthread_cleanup_push ((void *)crypto_cancel_gpgme, crypto);
 840
 841           do
 842             {
 843               if (!rc && crypto->progress_rc)
 844                 rc = crypto->progress_rc;
 845
 846               if (!rc)
 847                 STATUS_TIMEOUT_TEST (crypto, rc, STATUS_ENCRYPT, NULL);
 848
 849               if (rc)
 850                 break;
 851             } while (!gpgme_wait (crypto->ctx, &rc, 0) && !rc);
 852
 853           pthread_cleanup_pop (0);
 854
 855           if (!rc)
 856             {
 857               gpgme_encrypt_result_t result;
 858               gpgme_sign_result_t sresult;
 859               gpgme_invalid_key_t inv;
 860               gpgme_new_signature_t sigs;
 861               char **prune = NULL;
 862               char **p = NULL;
 863
 864               result = gpgme_op_encrypt_result (crypto->ctx);
 865               inv = result->invalid_recipients;
 866               while (inv)
 867                 {
 868                   pthread_cleanup_push ((void *)strv_free, prune);
 869                   log_write1 (_ ("%s: invalid recipient: %s, rc=%u"),
 870                               crypto->filename, inv->fpr, inv->reason);
 871                   pthread_cleanup_pop (0);
 872                   p = strv_cat (prune, str_dup(inv->fpr));
 873                   if (!p)
 874                     {
 875                       rc = GPG_ERR_ENOMEM;
 876                       strv_free (prune);
 877                       break;
 878                     }
 879
 880                   prune = p;
 881                   inv = inv->next;
 882                 }
 883
 884               if (prune)
 885                 {
 886                   p = prune_keys (crypto->save.pubkey, prune);
 887                   crypto->save.pubkey = p;
 888                 }
 889
 890               crypto_keyid_to_16b (crypto->save.pubkey);
 891               sresult = gpgme_op_sign_result (crypto->ctx);
 892               inv = sresult ? sresult->invalid_signers : NULL;
 893               while (!rc && inv)
 894                 {
 895                   log_write1 (_ ("%s: invalid signer: %s, rc=%u"),
 896                               crypto->filename, inv->fpr, inv->reason);
 897                   inv = inv->next;
 898                 }
 899
 900               sigs = sresult ? sresult->signatures : NULL;
 901               if (!rc && sigs)
 902                 {
 903                   p = NULL;
 904
 905                   while (sigs)
 906                     {
 907                       char **pp;
 908
 909                       pthread_cleanup_push ((void *)strv_free, p);
 910                       log_write1 (_ ("%s: signer: %s"), crypto->filename,
 911                                   sigs->fpr);
 912                       pthread_cleanup_pop (0);
 913
 914                       pp = strv_cat (p, str_dup (sigs->fpr));
 915                       if (!pp)
 916                         {
 917                           rc = GPG_ERR_ENOMEM;
 918                           strv_free (p);
 919                           break;
 920                         }
 921
 922                       p = pp;
 923                       sigs = sigs->next;
 924                     }
 925
 926                   if (!rc)
 927                     {
 928                       strv_free (crypto->save.sigkey);
 929                       crypto->save.sigkey = p;
 930                       crypto_keyid_to_16b (crypto->save.sigkey);
 931                       crypto->cipher = cipher;
 932                     }
 933                 }
 934               else if (!rc && crypto->flags & CRYPTO_FLAG_SYMMETRIC)
 935                 {
 936                   crypto->cipher = cipher;
 937                 }
 938               else if (!rc)
 939                 {
 940                  if (!(crypto->flags & CRYPTO_FLAG_SYMMETRIC)
 941                      || (crypto->flags & CRYPTO_FLAG_SYMMETRIC && sigkeys))
 942                    rc = GPG_ERR_NO_SIGNATURE_SCHEME;
 943                 }
 944             }
 945         }
 946
 947       pthread_cleanup_pop (1); // free_gpgme_data_cb (plain)
 948       pthread_cleanup_pop (1); // crypto_free_key_list (sigkeys)
 949     }
 950
 951   pthread_cleanup_pop (0); // free_gpgme_data_cb (cipher)
 952   pthread_cleanup_pop (1); // crypto_free_key_list (keys)
 953
 954   if (rc)
 955     free_gpgme_data_cb (cipher);
 956
 957   return rc;
 958 }
 959
 960 gpgme_error_t
 961 crypto_passwd (struct client_s *client, struct crypto_s *crypto)
 962 {
 963   gpgme_error_t rc;
 964   gpgme_key_t *keys = NULL;
 965
 966   /* Use SAVE instead for symmetric files. */
 967   rc = crypto_is_symmetric (client->filename);
 968   if (!rc || rc != GPG_ERR_BAD_DATA)
 969     return !rc ? GPG_ERR_NOT_SUPPORTED : rc;
 970
 971   rc = crypto_list_keys (crypto, crypto->pubkey, 1, &keys);
 972   if (rc)
 973     return rc;
 974
 975   crypto->flags |= CRYPTO_FLAG_PASSWD;
 976   pthread_cleanup_push ((void *)crypto_free_key_list, keys);
 977   STATUS_TIMEOUT_INIT (crypto);
 978   rc = send_status (client->ctx, STATUS_KEEPALIVE, NULL);
 979   if (!rc)
 980     rc = gpgme_op_passwd_start (crypto->ctx, keys[0], 0);
 981
 982   if (!rc)
 983     {
 984       pthread_cleanup_push ((void *)crypto_cancel_gpgme, crypto);
 985
 986       do
 987         {
 988           if (!rc && crypto->progress_rc)
 989             rc = crypto->progress_rc;
 990
 991           if (!rc)
 992             STATUS_TIMEOUT_TEST (crypto, rc, STATUS_KEEPALIVE, NULL);
 993
 994           if (rc)
 995             break;
 996         } while (!gpgme_wait (crypto->ctx, &rc, 0) && !rc);
 997
 998       pthread_cleanup_pop (0);
 999     }
1000
1001   pthread_cleanup_pop (1);
1002   return rc;
1003 }
1004
1005 /* Generate a new key pair. The resulting keyid's are stored in crypto->save.
1006  */
1007 gpgme_error_t
1008 crypto_genkey (struct client_s *client, struct crypto_s *crypto,
1009                const unsigned char *params)
1010 {
1011   gpgme_genkey_result_t result;
1012   gpgme_error_t rc;
1013
1014   if (strstr ((char *) params, "%pubring")
1015       || strstr ((char *) params, "%secring"))
1016     return GPG_ERR_INV_VALUE;
1017
1018   STATUS_TIMEOUT_INIT (crypto);
1019   rc = send_status (client ? client->ctx : NULL, STATUS_GENKEY, NULL);
1020   if (!rc)
1021     rc = gpgme_op_genkey_start (crypto->ctx, (const char *)params, NULL, NULL);
1022
1023   if (rc)
1024     return rc;
1025
1026   pthread_cleanup_push ((void *)crypto_cancel_gpgme, crypto);
1027
1028   do
1029     {
1030       if (!rc && crypto->progress_rc)
1031         rc = crypto->progress_rc;
1032
1033       if (!rc)
1034         STATUS_TIMEOUT_TEST (crypto, rc, STATUS_GENKEY, NULL);
1035
1036       if (rc)
1037         break;
1038     } while (!gpgme_wait (crypto->ctx, &rc, 0) && !rc);
1039
1040   pthread_cleanup_pop (0);
1041
1042   if (!rc)
1043     {
1044       gpgme_key_t *keys = NULL;
1045
1046       result = gpgme_op_genkey_result (crypto->ctx);
1047       crypto->save.sigkey = strv_cat (crypto->save.sigkey,
1048                                       str_dup (result->fpr));
1049       crypto_keyid_to_16b (crypto->save.sigkey);
1050
1051       rc = crypto_list_keys (crypto, crypto->save.sigkey, 1, &keys);
1052       if (!rc)
1053         {
1054           gpgme_subkey_t key = keys[0]->subkeys;
1055
1056           for (; key; key = key->next)
1057             {
1058               if (key->can_encrypt)
1059                 break;
1060             }
1061
1062           pthread_cleanup_push ((void *)crypto_free_key_list, keys);
1063           rc = send_status (client ? client->ctx : NULL, STATUS_GENKEY, "%s %s",
1064                             crypto->save.sigkey[0], key ? key->fpr : "");
1065           if (!rc)
1066             {
1067               crypto->save.pubkey = strv_cat (crypto->save.pubkey,
1068                                               str_dup (key->fpr));
1069               crypto_keyid_to_16b (crypto->save.pubkey);
1070             }
1071
1072           pthread_cleanup_pop (1);
1073         }
1074     }
1075
1076   return rc;
1077 }
1078
1079 char *
1080 crypto_default_key_params ()
1081 {
1082   char *user = get_username (getuid());
1083   char *params = str_asprintf(
1084                               "<GnupgKeyParms format=\"internal\">\n"
1085                               "  Key-Type: default\n"
1086                               "  Subkey-Type: default\n"
1087                               "  Name-Real: %s\n"
1088                               "  Name-Email: %s\n"
1089                               "  Expire-Date: 0\n"
1090                               "</GnupgKeyParms>",
1091                               getenv ("REALNAME") ? getenv ("REALNAME") : user,
1092                               getenv ("EMAIL") ? getenv ("EMAIL") : user);
1093
1094   xfree (user);
1095   return params;
1096 }
1097
1098 #ifdef WITH_LIBACL
1099 static void
1100 acl_free_cb (void *arg)
1101 {
1102   acl_t acl = arg ? (acl_t) arg : NULL;
1103
1104   if (acl)
1105     acl_free (acl);
1106 }
1107 #endif
1108
1109 /* The advisory lock should be obtained before calling this function. */
1110 gpg_error_t
1111 crypto_write_file (struct crypto_s *crypto)
1112 {
1113   unsigned char *buf;
1114   size_t size, len;
1115   int fd;
1116   gpg_error_t rc;
1117   char tmp[PATH_MAX];
1118   struct stat st;
1119   mode_t mode = 0600;
1120 #ifdef WITH_LIBACL
1121   acl_t acl = NULL;
1122 #endif
1123
1124   if (crypto->filename)
1125     {
1126       if (lstat (crypto->filename, &st) == 0)
1127         {
1128           mode = st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
1129
1130           if (!(mode & S_IWUSR))
1131             return GPG_ERR_EACCES;
1132         }
1133       else if (errno != ENOENT)
1134         return gpg_error_from_errno (errno);
1135
1136       snprintf (tmp, sizeof (tmp), "%s.XXXXXX", crypto->filename);
1137       mode_t tmode = umask (0600);
1138       fd = mkstemp (tmp);
1139       if (fd == -1)
1140         {
1141           rc = gpg_error_from_errno (errno);
1142           umask (tmode);
1143           log_write ("%s: %s", tmp, pwmd_strerror (rc));
1144           return rc;
1145         }
1146
1147       umask (tmode);
1148     }
1149   else
1150     fd = STDOUT_FILENO;
1151
1152   rc = crypto_data_to_buf (crypto->cipher, &buf, &size);
1153   if (rc)
1154     {
1155       if (crypto->filename)
1156         close (fd);
1157       return rc;
1158     }
1159
1160   pthread_cleanup_push ((void *)close_fd_cb, &fd);
1161   pthread_cleanup_push ((void *)xfree, buf);
1162   len = write (fd, buf, size);
1163   pthread_cleanup_pop (1);
1164   if (len != size)
1165     rc = gpg_error_from_errno (errno);
1166
1167   if (!rc)
1168     {
1169       if (fsync (fd) != -1)
1170         {
1171           if (crypto->filename && close (fd) != -1)
1172             {
1173 #ifdef WITH_LIBACL
1174               acl = acl_get_file (crypto->filename, ACL_TYPE_ACCESS);
1175               if (!acl && errno == ENOENT)
1176                 acl = acl_get_file (".", ACL_TYPE_DEFAULT);
1177               if (!acl)
1178                 log_write ("ACL: %s: %s", crypto->filename,
1179                            pwmd_strerror (gpg_error_from_errno (errno)));
1180               pthread_cleanup_push ((void *)acl_free_cb, acl);
1181 #endif
1182
1183               fd = -1;
1184               if (config_get_boolean (crypto->filename, "backup"))
1185                 {
1186                   char tmp2[PATH_MAX];
1187
1188                   snprintf (tmp2, sizeof (tmp2), "%s.backup", crypto->filename);
1189                   if (rename (crypto->filename, tmp2) == -1)
1190                     if (errno != ENOENT)
1191                       rc = gpg_error_from_errno (errno);
1192                 }
1193
1194               if (!rc && rename (tmp, crypto->filename) == -1)
1195                 rc = gpg_error_from_errno (errno);
1196
1197               if (!rc)
1198                 chmod (crypto->filename, mode);
1199 #ifdef WITH_LIBACL
1200               if (!rc && acl && acl_set_file (crypto->filename,
1201                                               ACL_TYPE_ACCESS, acl))
1202                 log_write ("ACL: %s: %s", crypto->filename,
1203                            pwmd_strerror (gpg_error_from_errno (errno)));
1204               pthread_cleanup_pop (1);
1205 #endif
1206             }
1207           else if (crypto->filename)
1208             rc = gpg_error_from_errno (errno);
1209
1210           if (!rc && fd != -1)
1211             {
1212               char *tmp = str_asprintf ("%s/data", homedir);
1213
1214               if (tmp)
1215                 {
1216                   int dfd = open (tmp, O_RDONLY);
1217
1218                   if (dfd != -1)
1219                     {
1220                       if (fsync (dfd) == -1)
1221                         log_write ("%s %d: %s", __FILE__, __LINE__,
1222                                    pwmd_strerror (errno));
1223
1224                       close (dfd);
1225                     }
1226                   else
1227                     log_write ("%s %d: %s", __FILE__, __LINE__,
1228                                pwmd_strerror (errno));
1229
1230                   xfree (tmp);
1231                 }
1232             }
1233         }
1234       else
1235         rc = gpg_error_from_errno (errno);
1236     }
1237
1238   pthread_cleanup_pop (0); // close (fd)
1239   if (fd != -1)
1240     close (fd);
1241   return rc;
1242 }
1243
1244 char *
1245 crypto_key_info (const gpgme_key_t key)
1246 {
1247   struct string_s *string = string_new (NULL), *s;
1248   char *line = NULL;
1249   unsigned n, u;
1250   gpgme_subkey_t subkey;
1251   gpgme_user_id_t uid;
1252
1253   if (!string)
1254     return NULL;
1255
1256   for (u = 0, uid = key->uids; uid; uid = uid->next)
1257     u++;
1258
1259   for (n = 0, subkey = key->subkeys; subkey; subkey = subkey->next)
1260     n++;
1261
1262   s = string_append_printf (string, "%u:%u:%u:%u:%u:%u:%u:%u:%u:%u:%i:%s:%s:%s:%i:%u:%u",
1263                             key->revoked, key->expired, key->disabled,
1264                             key->invalid, key->can_encrypt, key->can_sign,
1265                             key->can_certify, key->secret,
1266                             key->can_authenticate, key->is_qualified,
1267                             key->protocol,
1268                             key->issuer_serial ? key->issuer_serial : "",
1269                             key->issuer_name ? key->issuer_name : "",
1270                             key->chain_id ? key->chain_id : "",
1271                             key->owner_trust, u, n);
1272   if (!s)
1273     {
1274       string_free (string, 1);
1275       return NULL;
1276     }
1277
1278   string = s;
1279   for (subkey = key->subkeys; subkey; subkey = subkey->next)
1280     {
1281       char *tmp;
1282
1283       s = string_append_printf (string, ":%u:%u:%u:%u:%u:%u:%u:%u:%u:%u:%u:%i:%u",
1284                                 subkey->revoked, subkey->expired,
1285                                 subkey->disabled, subkey->invalid,
1286                                 subkey->can_encrypt, subkey->can_sign,
1287                                 subkey->can_certify, subkey->secret,
1288                                 subkey->can_authenticate, subkey->is_qualified,
1289                                 subkey->is_cardkey, subkey->pubkey_algo,
1290                                 subkey->length);
1291       if (!s)
1292         {
1293           string_free (string, 1);
1294           return NULL;
1295         }
1296
1297       string = s;
1298       s = string_append_printf (string, ":%s:%s:%s:%li:%li:%s",
1299                                 subkey->keyid, subkey->fpr,
1300                                 subkey->keygrip ? subkey->keygrip : "",
1301                                 subkey->timestamp, subkey->expires,
1302                                 subkey->card_number ? subkey->card_number : "0");
1303       if (!s)
1304         {
1305           string_free (string, 1);
1306           return NULL;
1307         }
1308
1309       string = s;
1310       tmp = gnupg_escape (subkey->curve);
1311       s = string_append_printf (string, ":%s", tmp ? tmp : "");
1312       xfree (tmp);
1313       if (!s)
1314         {
1315           string_free (string, 1);
1316           return NULL;
1317         }
1318
1319       string = s;
1320     }
1321
1322   for (uid = key->uids; uid; uid = uid->next)
1323     {
1324       char *userid, *name, *email, *comment;
1325
1326       userid = gnupg_escape (uid->uid);
1327       name = gnupg_escape (uid->name);
1328       email = gnupg_escape (uid->email);
1329       comment = gnupg_escape (uid->comment);
1330       s = string_append_printf (string, ":%u:%u:%u:%s:%s:%s:%s",
1331                                 uid->revoked, uid->invalid, uid->validity,
1332                                 userid ? userid : "",
1333                                 name ? name : "",
1334                                 email ? email : "",
1335                                 comment ? comment : "");
1336       xfree (userid);
1337       xfree (name);
1338       xfree (email);
1339       xfree (comment);
1340       if (!s)
1341         {
1342           string_free (string, 1);
1343           return NULL;
1344         }
1345
1346       string = s;
1347     }
1348
1349   line = string->str;
1350   string_free (string, 0);
1351   return line;
1352 }
1353
1354 gpg_error_t
1355 crypto_try_decrypt (struct client_s *client, int no_pinentry)
1356 {
1357   struct crypto_s *crypto;
1358   gpg_error_t rc;
1359   char *keyfile = config_get_string (client->filename, "passphrase_file");
1360
1361   rc = crypto_init (&crypto, client->ctx, client->filename, no_pinentry,
1362                     keyfile);
1363   if (!rc)
1364     {
1365       pthread_cleanup_push ((void *)crypto_free, crypto);
1366       rc = crypto_decrypt (client, crypto);
1367       pthread_cleanup_pop (1);
1368     }
1369   else
1370     xfree (keyfile);
1371
1372   return rc;
1373 }
1374
1375 /* The advisory lock should be obtained before calling this function. */
1376 gpg_error_t
1377 crypto_is_symmetric (const char *filename)
1378 {
1379   int fd;
1380   uint8_t magic[2];
1381   ssize_t len;
1382
1383   fd = open (filename, O_RDONLY);
1384   if (fd == -1)
1385     return gpg_error_from_errno (errno);
1386
1387   len = read (fd, &magic, sizeof(magic));
1388   close (fd);
1389   if (len != sizeof (magic))
1390     return GPG_ERR_INV_VALUE;
1391
1392   // Always read as big endian.
1393   if (magic[0] != 0x8c || magic[1] != 0x0d)
1394     return GPG_ERR_BAD_DATA;
1395
1396   return 0;
1397 }