/mandos/trunk

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

  • Committer: Teddy Hogeborn
  • Date: 2015-06-02 17:43:53 UTC
  • Revision ID: teddy@recompile.se-20150602174353-tvqw31mgxfapl985
mandos.service ([Service]/KillMode): Changed to "mixed".

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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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}
495
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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){
498
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  const char *ret = gnutls_strerror(value);
499
 
  if(ret == NULL)
500
 
    ret = "(unknown)";
501
 
  return ret;
 
506
  return safe_string(ret);
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}
503
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504
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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;
 
521
  unsigned int uret;
516
522
  
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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);
 
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          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;
 
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        }
 
601
        /* check bytes_read for failure */
 
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        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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        }
 
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        buffer.size += (unsigned int)bytes_read;
 
609
      }
 
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      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"
 
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                       " structure: %s", safer_gnutls_strerror(ret));
 
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          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);
 
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          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
  }
572
679
  ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
680
  if(ret != GNUTLS_E_SUCCESS){
574
 
    fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
 
                 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));
576
683
    goto globalfail;
577
684
  }
578
685
  
1650
1757
        _exit(EXIT_FAILURE);
1651
1758
      }
1652
1759
    } else {
 
1760
      if(hook_pid == -1){
 
1761
        perror_plus("fork");
 
1762
        free(direntry);
 
1763
        continue;
 
1764
      }
1653
1765
      int status;
1654
1766
      if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
1767
        perror_plus("waitpid");
1895
2007
}
1896
2008
 
1897
2009
int main(int argc, char *argv[]){
1898
 
  mandos_context mc = { .server = NULL, .dh_bits = 1024,
 
2010
  mandos_context mc = { .server = NULL, .dh_bits = 0,
1899
2011
                        .priority = "SECURE256:!CTYPE-X.509:"
1900
 
                        "+CTYPE-OPENPGP", .current_server = NULL,
 
2012
                        "+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1901
2013
                        .interfaces = NULL, .interfaces_size = 0 };
1902
2014
  AvahiSServiceBrowser *sb = NULL;
1903
2015
  error_t ret_errno;