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

  • Committer: Teddy Hogeborn
  • Date: 2018-08-19 14:58:40 UTC
  • Revision ID: teddy@recompile.se-20180819145840-s1a3xar41lyoq4ty
Set executable permissions on new files

* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -

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Lines of Context:
plugins.d/mandos-client.c
9
9
 * "browse_callback", and parts of "main".
10
10
 * 
11
11
 * Everything else is
12
 
 * Copyright © 2008-2020 Teddy Hogeborn
13
 
 * Copyright © 2008-2020 Björn Påhlsson
 
12
 * Copyright © 2008-2018 Teddy Hogeborn
 
13
 * Copyright © 2008-2018 Björn Påhlsson
14
14
 * 
15
15
 * This file is part of Mandos.
16
16
 * 
80
80
#include <unistd.h>             /* close(), SEEK_SET, off_t, write(),
81
81
                                   getuid(), getgid(), seteuid(),
82
82
                                   setgid(), pause(), _exit(),
83
 
                                   unlinkat(), lstat(), symlink() */
 
83
                                   unlinkat() */
84
84
#include <arpa/inet.h>          /* inet_pton(), htons() */
85
85
#include <iso646.h>             /* not, or, and */
86
86
#include <argp.h>               /* struct argp_option, error_t, struct
123
123
                                   gnutls_*
124
124
                                   init_gnutls_session(),
125
125
                                   GNUTLS_* */
126
 
#if GNUTLS_VERSION_NUMBER < 0x030600
127
126
#include <gnutls/openpgp.h>
128
127
                         /* gnutls_certificate_set_openpgp_key_file(),
129
128
                            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
135
129
 
136
130
/* GPGME */
137
131
#include <gpgme.h>              /* All GPGME types, constants and
145
139
#define PATHDIR "/conf/conf.d/mandos"
146
140
#define SECKEY "seckey.txt"
147
141
#define PUBKEY "pubkey.txt"
148
 
#define TLS_PRIVKEY "tls-privkey.pem"
149
 
#define TLS_PUBKEY "tls-pubkey.pem"
150
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
143
 
152
144
bool debug = false;
396
388
        fprintf_plus(stderr,
397
389
                     "Setting system clock to key file mtime");
398
390
      }
399
 
      if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
 
        perror_plus("clock_settime");
 
391
      time_t keytime = keystat.st_mtim.tv_sec;
 
392
      if(stime(&keytime) != 0){
 
393
        perror_plus("stime");
401
394
      }
402
395
      ret = lower_privileges();
403
396
      if(ret != 0){
706
699
                              const char *dhparamsfilename,
707
700
                              mandos_context *mc){
708
701
  int ret;
 
702
  unsigned int uret;
709
703
  
710
704
  if(debug){
711
705
    fprintf_plus(stderr, "Initializing GnuTLS\n");
728
722
  }
729
723
  
730
724
  if(debug){
731
 
    fprintf_plus(stderr, "Attempting to use public key %s and"
732
 
                 " private key %s as GnuTLS credentials\n",
 
725
    fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
 
726
                 " secret key %s as GnuTLS credentials\n",
733
727
                 pubkeyfilename,
734
728
                 seckeyfilename);
735
729
  }
736
730
  
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
750
731
  ret = gnutls_certificate_set_openpgp_key_file
751
732
    (mc->cred, pubkeyfilename, seckeyfilename,
752
733
     GNUTLS_OPENPGP_FMT_BASE64);
753
 
#else
754
 
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
 
#endif
756
734
  if(ret != GNUTLS_E_SUCCESS){
757
735
    fprintf_plus(stderr,
758
 
                 "Error[%d] while reading the key pair ('%s',"
 
736
                 "Error[%d] while reading the OpenPGP key pair ('%s',"
759
737
                 " '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
738
    fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
739
                 safer_gnutls_strerror(ret));
832
810
  }
833
811
  if(dhparamsfilename == NULL){
834
812
    if(mc->dh_bits == 0){
835
 
#if GNUTLS_VERSION_NUMBER < 0x030600
836
813
      /* Find out the optimal number of DH bits */
837
814
      /* Try to read the private key file */
838
815
      gnutls_datum_t buffer = { .data = NULL, .size = 0 };
918
895
          }
919
896
        }
920
897
      }
921
 
      unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
 
898
      uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
899
      if(uret != 0){
923
900
        mc->dh_bits = uret;
924
901
        if(debug){
936
913
                     safer_gnutls_strerror(ret));
937
914
        goto globalfail;
938
915
      }
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);
 
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;
953
926
    }
954
927
  }
 
928
  gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
955
929
  
956
930
  return 0;
957
931
  
968
942
  int ret;
969
943
  /* GnuTLS session creation */
970
944
  do {
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
 
                                ));
 
945
    ret = gnutls_init(session, GNUTLS_SERVER);
979
946
    if(quit_now){
980
947
      return -1;
981
948
    }
1073
1040
      ret = setgid(0);
1074
1041
      if(ret == -1){
1075
1042
        perror_plus("setgid");
1076
 
        close(devnull);
1077
1043
        _exit(EX_NOPERM);
1078
1044
      }
1079
1045
      /* Reset supplementary groups */
1081
1047
      ret = setgroups(0, NULL);
1082
1048
      if(ret == -1){
1083
1049
        perror_plus("setgroups");
1084
 
        close(devnull);
1085
1050
        _exit(EX_NOPERM);
1086
1051
      }
1087
1052
    }
1088
1053
    ret = dup2(devnull, STDIN_FILENO);
1089
1054
    if(ret == -1){
1090
1055
      perror_plus("dup2(devnull, STDIN_FILENO)");
1091
 
      close(devnull);
1092
1056
      _exit(EX_OSERR);
1093
1057
    }
1094
1058
    ret = close(devnull);
1095
1059
    if(ret == -1){
1096
1060
      perror_plus("close");
 
1061
      _exit(EX_OSERR);
1097
1062
    }
1098
1063
    ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
1064
    if(ret == -1){
1134
1099
  }
1135
1100
  if(pid == -1){
1136
1101
    perror_plus("fork");
1137
 
    close(devnull);
1138
1102
    return false;
1139
1103
  }
1140
 
  ret = close(devnull);
1141
 
  if(ret == -1){
1142
 
    perror_plus("close");
1143
 
  }
1144
1104
  int status;
1145
1105
  pid_t pret = -1;
1146
1106
  errno = 0;
2467
2427
 
2468
2428
int main(int argc, char *argv[]){
2469
2429
  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
2475
2430
                        .priority = "SECURE256:!CTYPE-X.509"
2476
2431
                        ":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
 
#else
2478
 
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
 
#endif
2480
2432
                        .current_server = NULL, .interfaces = NULL,
2481
2433
                        .interfaces_size = 0 };
2482
2434
  AvahiSServiceBrowser *sb = NULL;
2493
2445
  AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
2446
  const char *seckey = PATHDIR "/" SECKEY;
2495
2447
  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
2500
2448
  const char *dh_params_file = NULL;
2501
2449
  char *interfaces_hooks = NULL;
2502
2450
  
2550
2498
      { .name = "pubkey", .key = 'p',
2551
2499
        .arg = "FILE",
2552
2500
        .doc = "OpenPGP public key file base name",
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 },
 
2501
        .group = 2 },
2570
2502
      { .name = "dh-bits", .key = 129,
2571
2503
        .arg = "BITS",
2572
2504
        .doc = "Bit length of the prime number used in the"
2628
2560
      case 'p':                 /* --pubkey */
2629
2561
        pubkey = arg;
2630
2562
        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;
2641
2563
      case 129:                 /* --dh-bits */
2642
2564
        errno = 0;
2643
2565
        tmpmax = strtoimax(arg, &tmp, 10);
2678
2600
        argp_state_help(state, state->out_stream,
2679
2601
                        (ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
2602
                        & ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
 
        __builtin_unreachable();
2682
2603
      case -3:                  /* --usage */
2683
2604
        argp_state_help(state, state->out_stream,
2684
2605
                        ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
 
        __builtin_unreachable();
2686
2606
      case 'V':                 /* --version */
2687
2607
        fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
2608
        exit(argp_err_exit_status);
2715
2635
  }
2716
2636
  
2717
2637
  {
 
2638
    /* Work around Debian bug #633582:
 
2639
       <https://bugs.debian.org/633582> */
 
2640
    
2718
2641
    /* Re-raise privileges */
2719
2642
    ret = raise_privileges();
2720
2643
    if(ret != 0){
2723
2646
    } else {
2724
2647
      struct stat st;
2725
2648
      
2726
 
      /* Work around Debian bug #633582:
2727
 
         <https://bugs.debian.org/633582> */
2728
 
 
2729
2649
      if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2730
2650
        int seckey_fd = open(seckey, O_RDONLY);
2731
2651
        if(seckey_fd == -1){
2790
2710
        }
2791
2711
      }
2792
2712
      
2793
 
      /* Work around Debian bug #981302
2794
 
         <https://bugs.debian.org/981302> */
2795
 
      if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2796
 
        ret = symlink("/proc/self/fd", "/dev/fd");
2797
 
        if(ret == -1){
2798
 
          perror_plus("Failed to create /dev/fd symlink");
2799
 
        }
2800
 
      }
2801
 
 
2802
2713
      /* Lower privileges */
2803
2714
      ret = lower_privileges();
2804
2715
      if(ret != 0){
3008
2919
    goto end;
3009
2920
  }
3010
2921
  
3011
 
#if GNUTLS_VERSION_NUMBER >= 0x030606
3012
 
  ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3013
 
#elif GNUTLS_VERSION_NUMBER < 0x030600
3014
2922
  ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3015
 
#else
3016
 
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3017
 
#endif
3018
2923
  if(ret == -1){
3019
2924
    fprintf_plus(stderr, "init_gnutls_global failed\n");
3020
2925
    exitcode = EX_UNAVAILABLE;