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

  • Committer: Teddy Hogeborn
  • Date: 2014-08-06 20:56:55 UTC
  • mto: This revision was merged to the branch mainline in revision 728.
  • Revision ID: teddy@recompile.se-20140806205655-lq7xkfr3b9pbwr6l
Tags: version-1.6.8-1
* Makefile (version): Changed to "1.6.8".
* NEWS (Version 1.6.8): New entry.
* debian/changelog (1.6.8-1): - '' -

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Lines of Context:
plugins.d/mandos-client.c
493
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  return plaintext_length;
494
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}
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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
 
 
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__attribute__((warn_unused_result))
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static const char *safer_gnutls_strerror(int value){
505
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  const char *ret = gnutls_strerror(value);
506
 
  return safe_string(ret);
 
499
  if(ret == NULL)
 
500
    ret = "(unknown)";
 
501
  return ret;
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}
508
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509
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/* GnuTLS log function callback */
518
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                              const char *seckeyfilename,
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                              mandos_context *mc){
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  int ret;
521
 
  unsigned int uret;
522
516
  
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  if(debug){
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    fprintf_plus(stderr, "Initializing GnuTLS\n");
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                 safer_gnutls_strerror(ret));
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    goto globalfail;
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  }
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,
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                                    (size_t)buffer_capacity);
589
 
        if(buffer_capacity == 0){
590
 
          perror_plus("incbuffer");
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          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){
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          break;
600
 
        }
601
 
        /* check bytes_read for failure */
602
 
        if(bytes_read < 0){
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          perror_plus("read");
604
 
          free(buffer.data);
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          buffer.data = NULL;
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          break;
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        }
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);
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          buffer.data = NULL;
623
 
        } else {
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          ret = gnutls_openpgp_privkey_import(privkey, &buffer,
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                                            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
 
  }
679
572
  ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
573
  if(ret != GNUTLS_E_SUCCESS){
681
 
    fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
 
                 " %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
 
574
    fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
 
575
                 safer_gnutls_strerror(ret));
683
576
    goto globalfail;
684
577
  }
685
578
  
1757
1650
        _exit(EXIT_FAILURE);
1758
1651
      }
1759
1652
    } else {
1760
 
      if(hook_pid == -1){
1761
 
        perror_plus("fork");
1762
 
        free(direntry);
1763
 
        continue;
1764
 
      }
1765
1653
      int status;
1766
1654
      if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
1655
        perror_plus("waitpid");
2007
1895
}
2008
1896
 
2009
1897
int main(int argc, char *argv[]){
2010
 
  mandos_context mc = { .server = NULL, .dh_bits = 0,
 
1898
  mandos_context mc = { .server = NULL, .dh_bits = 1024,
2011
1899
                        .priority = "SECURE256:!CTYPE-X.509:"
2012
 
                        "+CTYPE-OPENPGP:!RSA", .current_server = NULL,
 
1900
                        "+CTYPE-OPENPGP", .current_server = NULL,
2013
1901
                        .interfaces = NULL, .interfaces_size = 0 };
2014
1902
  AvahiSServiceBrowser *sb = NULL;
2015
1903
  error_t ret_errno;