/mandos/trunk

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

  • Committer: Teddy Hogeborn
  • Date: 2014-10-08 21:07:10 UTC
  • Revision ID: teddy@recompile.se-20141008210710-x0rg80z2aabdg05d
Handle local Zeroconf service name collisions.

Service name collisions from other servers have always been handled,
but not *local* name collisions from services on the same host.

* mandos (AvahiService/rename): Handle local Zeroconf service name
                                collision.
  (AvahiServiceToSyslog.rename): Pass on any extra arguments.

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Lines of Context:
plugins.d/mandos-client.c
493
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  return plaintext_length;
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}
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__attribute__((warn_unused_result, const))
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static const char *safe_string(const char *str){
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  if(str == NULL)
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    return "(unknown)";
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  return str;
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}
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__attribute__((warn_unused_result))
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static const char *safer_gnutls_strerror(int value){
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  const char *ret = gnutls_strerror(value);
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  return safe_string(ret);
 
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  if(ret == NULL)
 
500
    ret = "(unknown)";
 
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  return ret;
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}
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/* GnuTLS log function callback */
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                              const char *seckeyfilename,
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                              mandos_context *mc){
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  int ret;
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  unsigned int uret;
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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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  }
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  if(mc->dh_bits == 0){
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    /* Find out the optimal number of DH bits */
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    /* Try to read the private key file */
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    gnutls_datum_t buffer = { .data = NULL, .size = 0 };
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    {
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      int secfile = open(seckeyfilename, O_RDONLY);
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      size_t buffer_capacity = 0;
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      while(true){
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        buffer_capacity = incbuffer((char **)&buffer.data,
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                                    (size_t)buffer.size,
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                                    (size_t)buffer_capacity);
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        if(buffer_capacity == 0){
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          perror_plus("incbuffer");
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          free(buffer.data);
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          buffer.data = NULL;
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          break;
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        }
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        ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
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                                  BUFFER_SIZE);
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        /* EOF */
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        if(bytes_read == 0){
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          break;
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        }
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        /* check bytes_read for failure */
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        if(bytes_read < 0){
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          perror_plus("read");
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          free(buffer.data);
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          buffer.data = NULL;
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          break;
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        }
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        buffer.size += (unsigned int)bytes_read;
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      }
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      close(secfile);
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    }
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    /* If successful, use buffer to parse private key */
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    gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
 
    if(buffer.data != NULL){
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      {
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        gnutls_openpgp_privkey_t privkey = NULL;
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        ret = gnutls_openpgp_privkey_init(&privkey);
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        if(ret != GNUTLS_E_SUCCESS){
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          fprintf_plus(stderr, "Error initializing OpenPGP key"
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                       " structure: %s", safer_gnutls_strerror(ret));
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          free(buffer.data);
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          buffer.data = NULL;
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        } else {
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          ret = gnutls_openpgp_privkey_import(privkey, &buffer,
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                                            GNUTLS_OPENPGP_FMT_BASE64,
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                                              "", 0);
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          if(ret != GNUTLS_E_SUCCESS){
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            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
  
2007
1900
}
2008
1901
 
2009
1902
int main(int argc, char *argv[]){
2010
 
  mandos_context mc = { .server = NULL, .dh_bits = 0,
 
1903
  mandos_context mc = { .server = NULL, .dh_bits = 1024,
2011
1904
                        .priority = "SECURE256:!CTYPE-X.509:"
2012
 
                        "+CTYPE-OPENPGP:!RSA", .current_server = NULL,
 
1905
                        "+CTYPE-OPENPGP", .current_server = NULL,
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                        .interfaces = NULL, .interfaces_size = 0 };
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1907
  AvahiSServiceBrowser *sb = NULL;
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  error_t ret_errno;