/mandos/trunk

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Viewing changes to plugins.d/mandos-client.c

  • Committer: Teddy Hogeborn
  • Date: 2015-07-06 20:14:45 UTC
  • Revision ID: teddy@recompile.se-20150706201445-kq3o6qozigmiqsp9
plugin-runner.xml (EXAMPLE): Use the /usr/lib/<arch> directory.
                             Also explain used options in order.

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Lines of Context:
plugins.d/mandos-client.c
240
240
  ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
241
  if(ret == -1){
242
242
    perror_plus("clock_gettime");
243
 
    free(new_server->ip);
 
243
#ifdef __GNUC__
 
244
#pragma GCC diagnostic push
 
245
#pragma GCC diagnostic ignored "-Wcast-qual"
 
246
#endif
 
247
    free((char *)(new_server->ip));
 
248
#ifdef __GNUC__
 
249
#pragma GCC diagnostic pop
 
250
#endif
244
251
    free(new_server);
245
252
    return false;
246
253
  }
486
493
  return plaintext_length;
487
494
}
488
495
 
 
496
__attribute__((warn_unused_result, const))
 
497
static const char *safe_string(const char *str){
 
498
  if(str == NULL)
 
499
    return "(unknown)";
 
500
  return str;
 
501
}
 
502
 
489
503
__attribute__((warn_unused_result))
490
504
static const char *safer_gnutls_strerror(int value){
491
505
  const char *ret = gnutls_strerror(value);
492
 
  if(ret == NULL)
493
 
    ret = "(unknown)";
494
 
  return ret;
 
506
  return safe_string(ret);
495
507
}
496
508
 
497
509
/* GnuTLS log function callback */
506
518
                              const char *seckeyfilename,
507
519
                              mandos_context *mc){
508
520
  int ret;
 
521
  unsigned int uret;
509
522
  
510
523
  if(debug){
511
524
    fprintf_plus(stderr, "Initializing GnuTLS\n");
562
575
                 safer_gnutls_strerror(ret));
563
576
    goto globalfail;
564
577
  }
 
578
  if(mc->dh_bits == 0){
 
579
    /* Find out the optimal number of DH bits */
 
580
    /* Try to read the private key file */
 
581
    gnutls_datum_t buffer = { .data = NULL, .size = 0 };
 
582
    {
 
583
      int secfile = open(seckeyfilename, O_RDONLY);
 
584
      size_t buffer_capacity = 0;
 
585
      while(true){
 
586
        buffer_capacity = incbuffer((char **)&buffer.data,
 
587
                                    (size_t)buffer.size,
 
588
                                    (size_t)buffer_capacity);
 
589
        if(buffer_capacity == 0){
 
590
          perror_plus("incbuffer");
 
591
          free(buffer.data);
 
592
          buffer.data = NULL;
 
593
          break;
 
594
        }
 
595
        ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
 
596
                                  BUFFER_SIZE);
 
597
        /* EOF */
 
598
        if(bytes_read == 0){
 
599
          break;
 
600
        }
 
601
        /* check bytes_read for failure */
 
602
        if(bytes_read < 0){
 
603
          perror_plus("read");
 
604
          free(buffer.data);
 
605
          buffer.data = NULL;
 
606
          break;
 
607
        }
 
608
        buffer.size += (unsigned int)bytes_read;
 
609
      }
 
610
      close(secfile);
 
611
    }
 
612
    /* If successful, use buffer to parse private key */
 
613
    gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
 
614
    if(buffer.data != NULL){
 
615
      {
 
616
        gnutls_openpgp_privkey_t privkey = NULL;
 
617
        ret = gnutls_openpgp_privkey_init(&privkey);
 
618
        if(ret != GNUTLS_E_SUCCESS){
 
619
          fprintf_plus(stderr, "Error initializing OpenPGP key"
 
620
                       " structure: %s", safer_gnutls_strerror(ret));
 
621
          free(buffer.data);
 
622
          buffer.data = NULL;
 
623
        } else {
 
624
          ret = gnutls_openpgp_privkey_import(privkey, &buffer,
 
625
                                            GNUTLS_OPENPGP_FMT_BASE64,
 
626
                                              "", 0);
 
627
          if(ret != GNUTLS_E_SUCCESS){
 
628
            fprintf_plus(stderr, "Error importing OpenPGP key : %s",
 
629
                         safer_gnutls_strerror(ret));
 
630
            privkey = NULL;
 
631
          }
 
632
          free(buffer.data);
 
633
          buffer.data = NULL;
 
634
          if(privkey != NULL){
 
635
            /* Use private key to suggest an appropriate sec_param */
 
636
            sec_param = gnutls_openpgp_privkey_sec_param(privkey);
 
637
            gnutls_openpgp_privkey_deinit(privkey);
 
638
            if(debug){
 
639
              fprintf_plus(stderr, "This OpenPGP key implies using a"
 
640
                           " GnuTLS security parameter \"%s\".\n",
 
641
                           safe_string(gnutls_sec_param_get_name
 
642
                                       (sec_param)));
 
643
            }
 
644
          }
 
645
        }
 
646
      }
 
647
      if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
 
648
        /* Err on the side of caution */
 
649
        sec_param = GNUTLS_SEC_PARAM_ULTRA;
 
650
        if(debug){
 
651
          fprintf_plus(stderr, "Falling back to security parameter"
 
652
                       " \"%s\"\n",
 
653
                       safe_string(gnutls_sec_param_get_name
 
654
                                   (sec_param)));
 
655
        }
 
656
      }
 
657
    }
 
658
    uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
 
659
    if(uret != 0){
 
660
      mc->dh_bits = uret;
 
661
      if(debug){
 
662
        fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
 
663
                     " implies %u DH bits; using that.\n",
 
664
                     safe_string(gnutls_sec_param_get_name
 
665
                                 (sec_param)),
 
666
                     mc->dh_bits);
 
667
      }
 
668
    } else {
 
669
      fprintf_plus(stderr, "Failed to get implied number of DH"
 
670
                   " bits for security parameter \"%s\"): %s\n",
 
671
                   safe_string(gnutls_sec_param_get_name(sec_param)),
 
672
                   safer_gnutls_strerror(ret));
 
673
      goto globalfail;
 
674
    }
 
675
  } else if(debug){
 
676
    fprintf_plus(stderr, "DH bits explicitly set to %u\n",
 
677
                 mc->dh_bits);
 
678
  }
565
679
  ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
566
680
  if(ret != GNUTLS_E_SUCCESS){
567
 
    fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
 
                 safer_gnutls_strerror(ret));
 
681
    fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
 
682
                 " %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
569
683
    goto globalfail;
570
684
  }
571
685
  
1069
1183
     timed out */
1070
1184
  
1071
1185
  if(quit_now){
 
1186
    avahi_s_service_resolver_free(r);
1072
1187
    return;
1073
1188
  }
1074
1189
  
1642
1757
        _exit(EXIT_FAILURE);
1643
1758
      }
1644
1759
    } else {
 
1760
      if(hook_pid == -1){
 
1761
        perror_plus("fork");
 
1762
        free(direntry);
 
1763
        continue;
 
1764
      }
1645
1765
      int status;
1646
1766
      if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
1767
        perror_plus("waitpid");
 
1768
        free(direntry);
1648
1769
        continue;
1649
1770
      }
1650
1771
      if(WIFEXITED(status)){
1652
1773
          fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
1774
                       " with status %d\n", direntry->d_name,
1654
1775
                       WEXITSTATUS(status));
 
1776
          free(direntry);
1655
1777
          continue;
1656
1778
        }
1657
1779
      } else if(WIFSIGNALED(status)){
1658
1780
        fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
1781
                     " signal %d\n", direntry->d_name,
1660
1782
                     WTERMSIG(status));
 
1783
        free(direntry);
1661
1784
        continue;
1662
1785
      } else {
1663
1786
        fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
1787
                     " crashed\n", direntry->d_name);
 
1788
        free(direntry);
1665
1789
        continue;
1666
1790
      }
1667
1791
    }
1669
1793
      fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
1794
                   direntry->d_name);
1671
1795
    }
 
1796
    free(direntry);
1672
1797
  }
1673
1798
  free(direntries);
1674
1799
  if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1882
2007
}
1883
2008
 
1884
2009
int main(int argc, char *argv[]){
1885
 
  mandos_context mc = { .server = NULL, .dh_bits = 1024,
 
2010
  mandos_context mc = { .server = NULL, .dh_bits = 0,
1886
2011
                        .priority = "SECURE256:!CTYPE-X.509:"
1887
 
                        "+CTYPE-OPENPGP", .current_server = NULL,
 
2012
                        "+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1888
2013
                        .interfaces = NULL, .interfaces_size = 0 };
1889
2014
  AvahiSServiceBrowser *sb = NULL;
1890
2015
  error_t ret_errno;
2268
2393
        if(ret_errno != 0){
2269
2394
          errno = ret_errno;
2270
2395
          perror_plus("argz_add");
 
2396
          free(direntries[i]);
2271
2397
          continue;
2272
2398
        }
2273
2399
        if(debug){
2274
2400
          fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
2401
                       direntries[i]->d_name);
2276
2402
        }
 
2403
        free(direntries[i]);
2277
2404
      }
2278
2405
      free(direntries);
2279
2406
    } else {
2549
2676
    mc.current_server->prev->next = NULL;
2550
2677
    while(mc.current_server != NULL){
2551
2678
      server *next = mc.current_server->next;
 
2679
#ifdef __GNUC__
 
2680
#pragma GCC diagnostic push
 
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
 
2682
#endif
 
2683
      free((char *)(mc.current_server->ip));
 
2684
#ifdef __GNUC__
 
2685
#pragma GCC diagnostic pop
 
2686
#endif
2552
2687
      free(mc.current_server);
2553
2688
      mc.current_server = next;
2554
2689
    }
2623
2758
                         " \"%s\", 0): %s\n", tempdir,
2624
2759
                         direntries[i]->d_name, strerror(errno));
2625
2760
          }
 
2761
          free(direntries[i]);
2626
2762
        }
2627
2763
        
2628
2764
        /* need to clean even if 0 because man page doesn't specify */