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  • Committer: Teddy Hogeborn
  • Date: 2020-11-30 09:40:14 UTC
  • Revision ID: teddy@recompile.se-20201130094014-33tl5zzswqprc034
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plugins.d/mandos-client.c
9
9
 * "browse_callback", and parts of "main".
10
10
 * 
11
11
 * Everything else is
12
 
 * Copyright © 2008-2018 Teddy Hogeborn
13
 
 * Copyright © 2008-2018 Björn Påhlsson
 
12
 * Copyright © 2008-2020 Teddy Hogeborn
 
13
 * Copyright © 2008-2020 Björn Påhlsson
14
14
 * 
15
15
 * This file is part of Mandos.
16
16
 * 
123
123
                                   gnutls_*
124
124
                                   init_gnutls_session(),
125
125
                                   GNUTLS_* */
 
126
#if GNUTLS_VERSION_NUMBER < 0x030600
126
127
#include <gnutls/openpgp.h>
127
128
                         /* gnutls_certificate_set_openpgp_key_file(),
128
129
                            GNUTLS_OPENPGP_FMT_BASE64 */
 
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
 
131
#include <gnutls/x509.h>        /* gnutls_pkcs_encrypt_flags_t,
 
132
                                 GNUTLS_PKCS_PLAIN,
 
133
                                 GNUTLS_PKCS_NULL_PASSWORD */
 
134
#endif
129
135
 
130
136
/* GPGME */
131
137
#include <gpgme.h>              /* All GPGME types, constants and
139
145
#define PATHDIR "/conf/conf.d/mandos"
140
146
#define SECKEY "seckey.txt"
141
147
#define PUBKEY "pubkey.txt"
 
148
#define TLS_PRIVKEY "tls-privkey.pem"
 
149
#define TLS_PUBKEY "tls-pubkey.pem"
142
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
151
 
144
152
bool debug = false;
388
396
        fprintf_plus(stderr,
389
397
                     "Setting system clock to key file mtime");
390
398
      }
391
 
      time_t keytime = keystat.st_mtim.tv_sec;
392
 
      if(stime(&keytime) != 0){
393
 
        perror_plus("stime");
 
399
      if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
 
400
        perror_plus("clock_settime");
394
401
      }
395
402
      ret = lower_privileges();
396
403
      if(ret != 0){
699
706
                              const char *dhparamsfilename,
700
707
                              mandos_context *mc){
701
708
  int ret;
702
 
  unsigned int uret;
703
709
  
704
710
  if(debug){
705
711
    fprintf_plus(stderr, "Initializing GnuTLS\n");
722
728
  }
723
729
  
724
730
  if(debug){
725
 
    fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
726
 
                 " secret key %s as GnuTLS credentials\n",
 
731
    fprintf_plus(stderr, "Attempting to use public key %s and"
 
732
                 " private key %s as GnuTLS credentials\n",
727
733
                 pubkeyfilename,
728
734
                 seckeyfilename);
729
735
  }
730
736
  
 
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
738
  ret = gnutls_certificate_set_rawpk_key_file
 
739
    (mc->cred, pubkeyfilename, seckeyfilename,
 
740
     GNUTLS_X509_FMT_PEM,       /* format */
 
741
     NULL,                      /* pass */
 
742
     /* key_usage */
 
743
     GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
 
744
     NULL,                      /* names */
 
745
     0,                         /* names_length */
 
746
     /* privkey_flags */
 
747
     GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
 
748
     0);                        /* pkcs11_flags */
 
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
731
750
  ret = gnutls_certificate_set_openpgp_key_file
732
751
    (mc->cred, pubkeyfilename, seckeyfilename,
733
752
     GNUTLS_OPENPGP_FMT_BASE64);
 
753
#else
 
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
755
#endif
734
756
  if(ret != GNUTLS_E_SUCCESS){
735
757
    fprintf_plus(stderr,
736
 
                 "Error[%d] while reading the OpenPGP key pair ('%s',"
 
758
                 "Error[%d] while reading the key pair ('%s',"
737
759
                 " '%s')\n", ret, pubkeyfilename, seckeyfilename);
738
760
    fprintf_plus(stderr, "The GnuTLS error is: %s\n",
739
761
                 safer_gnutls_strerror(ret));
810
832
  }
811
833
  if(dhparamsfilename == NULL){
812
834
    if(mc->dh_bits == 0){
 
835
#if GNUTLS_VERSION_NUMBER < 0x030600
813
836
      /* Find out the optimal number of DH bits */
814
837
      /* Try to read the private key file */
815
838
      gnutls_datum_t buffer = { .data = NULL, .size = 0 };
895
918
          }
896
919
        }
897
920
      }
898
 
      uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
 
921
      unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
922
      if(uret != 0){
900
923
        mc->dh_bits = uret;
901
924
        if(debug){
913
936
                     safer_gnutls_strerror(ret));
914
937
        goto globalfail;
915
938
      }
916
 
    } else if(debug){
917
 
      fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
 
                   mc->dh_bits);
919
 
    }
920
 
    ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
 
    if(ret != GNUTLS_E_SUCCESS){
922
 
      fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
 
                   " bits): %s\n", mc->dh_bits,
924
 
                   safer_gnutls_strerror(ret));
925
 
      goto globalfail;
 
939
#endif
 
940
    } else {                    /* dh_bits != 0 */
 
941
      if(debug){
 
942
        fprintf_plus(stderr, "DH bits explicitly set to %u\n",
 
943
                     mc->dh_bits);
 
944
      }
 
945
      ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
 
946
      if(ret != GNUTLS_E_SUCCESS){
 
947
        fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
 
948
                     " bits): %s\n", mc->dh_bits,
 
949
                     safer_gnutls_strerror(ret));
 
950
        goto globalfail;
 
951
      }
 
952
      gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
926
953
    }
927
954
  }
928
 
  gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
929
955
  
930
956
  return 0;
931
957
  
942
968
  int ret;
943
969
  /* GnuTLS session creation */
944
970
  do {
945
 
    ret = gnutls_init(session, GNUTLS_SERVER);
 
971
    ret = gnutls_init(session, (GNUTLS_SERVER
 
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
 
973
                                | GNUTLS_NO_TICKETS
 
974
#endif
 
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
976
                                | GNUTLS_ENABLE_RAWPK
 
977
#endif
 
978
                                ));
946
979
    if(quit_now){
947
980
      return -1;
948
981
    }
1040
1073
      ret = setgid(0);
1041
1074
      if(ret == -1){
1042
1075
        perror_plus("setgid");
 
1076
        close(devnull);
1043
1077
        _exit(EX_NOPERM);
1044
1078
      }
1045
1079
      /* Reset supplementary groups */
1047
1081
      ret = setgroups(0, NULL);
1048
1082
      if(ret == -1){
1049
1083
        perror_plus("setgroups");
 
1084
        close(devnull);
1050
1085
        _exit(EX_NOPERM);
1051
1086
      }
1052
1087
    }
1053
1088
    ret = dup2(devnull, STDIN_FILENO);
1054
1089
    if(ret == -1){
1055
1090
      perror_plus("dup2(devnull, STDIN_FILENO)");
 
1091
      close(devnull);
1056
1092
      _exit(EX_OSERR);
1057
1093
    }
1058
1094
    ret = close(devnull);
1059
1095
    if(ret == -1){
1060
1096
      perror_plus("close");
1061
 
      _exit(EX_OSERR);
1062
1097
    }
1063
1098
    ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
1099
    if(ret == -1){
1099
1134
  }
1100
1135
  if(pid == -1){
1101
1136
    perror_plus("fork");
 
1137
    close(devnull);
1102
1138
    return false;
1103
1139
  }
 
1140
  ret = close(devnull);
 
1141
  if(ret == -1){
 
1142
    perror_plus("close");
 
1143
  }
1104
1144
  int status;
1105
1145
  pid_t pret = -1;
1106
1146
  errno = 0;
2427
2467
 
2428
2468
int main(int argc, char *argv[]){
2429
2469
  mandos_context mc = { .server = NULL, .dh_bits = 0,
 
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2471
                        .priority = "SECURE128:!CTYPE-X.509"
 
2472
                        ":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
 
2473
                        ":%PROFILE_ULTRA",
 
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2430
2475
                        .priority = "SECURE256:!CTYPE-X.509"
2431
2476
                        ":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
 
2477
#else
 
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
2479
#endif
2432
2480
                        .current_server = NULL, .interfaces = NULL,
2433
2481
                        .interfaces_size = 0 };
2434
2482
  AvahiSServiceBrowser *sb = NULL;
2445
2493
  AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
2494
  const char *seckey = PATHDIR "/" SECKEY;
2447
2495
  const char *pubkey = PATHDIR "/" PUBKEY;
 
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2497
  const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
 
2498
  const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
 
2499
#endif
2448
2500
  const char *dh_params_file = NULL;
2449
2501
  char *interfaces_hooks = NULL;
2450
2502
  
2498
2550
      { .name = "pubkey", .key = 'p',
2499
2551
        .arg = "FILE",
2500
2552
        .doc = "OpenPGP public key file base name",
2501
 
        .group = 2 },
 
2553
        .group = 1 },
 
2554
      { .name = "tls-privkey", .key = 't',
 
2555
        .arg = "FILE",
 
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2557
        .doc = "TLS private key file base name",
 
2558
#else
 
2559
        .doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
 
2560
#endif
 
2561
        .group = 1 },
 
2562
      { .name = "tls-pubkey", .key = 'T',
 
2563
        .arg = "FILE",
 
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2565
        .doc = "TLS public key file base name",
 
2566
#else
 
2567
        .doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
 
2568
#endif
 
2569
        .group = 1 },
2502
2570
      { .name = "dh-bits", .key = 129,
2503
2571
        .arg = "BITS",
2504
2572
        .doc = "Bit length of the prime number used in the"
2560
2628
      case 'p':                 /* --pubkey */
2561
2629
        pubkey = arg;
2562
2630
        break;
 
2631
      case 't':                 /* --tls-privkey */
 
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2633
        tls_privkey = arg;
 
2634
#endif
 
2635
        break;
 
2636
      case 'T':                 /* --tls-pubkey */
 
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2638
        tls_pubkey = arg;
 
2639
#endif
 
2640
        break;
2563
2641
      case 129:                 /* --dh-bits */
2564
2642
        errno = 0;
2565
2643
        tmpmax = strtoimax(arg, &tmp, 10);
2600
2678
        argp_state_help(state, state->out_stream,
2601
2679
                        (ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2602
2680
                        & ~(unsigned int)ARGP_HELP_EXIT_OK);
 
2681
        __builtin_unreachable();
2603
2682
      case -3:                  /* --usage */
2604
2683
        argp_state_help(state, state->out_stream,
2605
2684
                        ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
 
2685
        __builtin_unreachable();
2606
2686
      case 'V':                 /* --version */
2607
2687
        fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2608
2688
        exit(argp_err_exit_status);
2919
2999
    goto end;
2920
3000
  }
2921
3001
  
 
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
3003
  ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
 
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
2922
3005
  ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
 
3006
#else
 
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
3008
#endif
2923
3009
  if(ret == -1){
2924
3010
    fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
3011
    exitcode = EX_UNAVAILABLE;