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

  • Committer: Teddy Hogeborn
  • Date: 2023-02-08 01:38:30 UTC
  • mfrom: (237.4.140 release)
  • Revision ID: teddy@recompile.se-20230208013830-sehn0b55qbhcxaj6
Merge from release branch

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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 © 2008-2022 Teddy Hogeborn
 
13
 * Copyright © 2008-2022 Björn Påhlsson
14
14
 * 
15
15
 * This file is part of Mandos.
16
16
 * 
38
38
#define _FILE_OFFSET_BITS 64
39
39
#endif  /* not _FILE_OFFSET_BITS */
40
40
 
41
 
#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY(), asprintf() */
42
 
 
43
 
#include <stdio.h>              /* fprintf(), stderr, fwrite(),
44
 
                                   stdout, ferror() */
45
 
#include <stdint.h>             /* uint16_t, uint32_t, intptr_t */
46
 
#include <stddef.h>             /* NULL, size_t, ssize_t */
47
 
#include <stdlib.h>             /* free(), EXIT_SUCCESS, srand(),
48
 
                                   strtof(), abort() */
 
41
#define _GNU_SOURCE             /* program_invocation_short_name,
 
42
                                   TEMP_FAILURE_RETRY(), O_CLOEXEC,
 
43
                                   scandirat(), asprintf() */
49
44
#include <stdbool.h>            /* bool, false, true */
50
 
#include <string.h>             /* strcmp(), strlen(), strerror(),
51
 
                                   asprintf(), strncpy(), strsignal()
52
 
                                */
53
 
#include <sys/ioctl.h>          /* ioctl */
54
 
#include <sys/types.h>          /* socket(), inet_pton(), sockaddr,
55
 
                                   sockaddr_in6, PF_INET6,
56
 
                                   SOCK_STREAM, uid_t, gid_t, open(),
57
 
                                   opendir(), DIR */
58
 
#include <sys/stat.h>           /* open(), S_ISREG */
59
 
#include <sys/socket.h>         /* socket(), struct sockaddr_in6,
60
 
                                   inet_pton(), connect(),
61
 
                                   getnameinfo() */
62
 
#include <fcntl.h>              /* open(), unlinkat(), AT_REMOVEDIR */
63
 
#include <dirent.h>             /* opendir(), struct dirent, readdir()
64
 
                                 */
65
 
#include <inttypes.h>           /* PRIu16, PRIdMAX, intmax_t,
66
 
                                   strtoimax() */
67
 
#include <errno.h>              /* perror(), errno, EINTR, EINVAL,
68
 
                                   EAI_SYSTEM, ENETUNREACH,
 
45
#include <argp.h>               /* argp_program_version,
 
46
                                   argp_program_bug_address,
 
47
                                   struct argp_option,
 
48
                                   struct argp_state, argp_error(),
 
49
                                   argp_state_help,
 
50
                                   ARGP_HELP_STD_HELP,
 
51
                                   ARGP_HELP_EXIT_ERR,
 
52
                                   ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
 
53
                                   argp_err_exit_status,
 
54
                                   ARGP_ERR_UNKNOWN, struct argp,
 
55
                                   argp_parse(), ARGP_IN_ORDER,
 
56
                                   ARGP_NO_HELP */
 
57
#include <stddef.h>             /* NULL, size_t */
 
58
#include <sys/types.h>          /* uid_t, gid_t, sig_atomic_t,
 
59
                                   seteuid(), setuid(), pid_t,
 
60
                                   setgid(), getuid(), getgid() */
 
61
#include <unistd.h>             /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
 
62
                                   seteuid(), setuid(), close(),
 
63
                                   ssize_t, read(), fork(), setgid(),
 
64
                                   _exit(), dup2(), STDIN_FILENO,
 
65
                                   STDERR_FILENO, STDOUT_FILENO,
 
66
                                   fexecve(), write(), getuid(),
 
67
                                   getgid(), fchown(), symlink(),
 
68
                                   sleep(), unlinkat(), pause() */
 
69
#include <netinet/in.h>         /* in_port_t, struct sockaddr_in6,
 
70
                                   sa_family_t, struct sockaddr_in,
 
71
                                   htons(), IN6_IS_ADDR_LINKLOCAL,
 
72
                                   INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
 
73
                                   ntohl(), IPPROTO_IP */
 
74
#include <time.h>               /* struct timespec, clock_gettime(),
 
75
                                   CLOCK_MONOTONIC, time_t, struct tm,
 
76
                                   gmtime_r(), clock_settime(),
 
77
                                   CLOCK_REALTIME, nanosleep() */
 
78
#include <errno.h>              /* errno,
 
79
                                   program_invocation_short_name,
 
80
                                   EINTR, EINVAL, ENETUNREACH,
69
81
                                   EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
 
                                   EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
 
                                   ENOTEMPTY,
72
 
                                   program_invocation_short_name */
73
 
#include <time.h>               /* nanosleep(), time(), sleep() */
74
 
#include <net/if.h>             /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
 
                                   SIOCSIFFLAGS, if_indextoname(),
76
 
                                   if_nametoindex(), IF_NAMESIZE */
77
 
#include <netinet/in.h>         /* IN6_IS_ADDR_LINKLOCAL,
78
 
                                   INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
 
                                */
80
 
#include <unistd.h>             /* close(), SEEK_SET, off_t, write(),
81
 
                                   getuid(), getgid(), seteuid(),
82
 
                                   setgid(), pause(), _exit(),
83
 
                                   unlinkat() */
84
 
#include <arpa/inet.h>          /* inet_pton(), htons() */
85
 
#include <iso646.h>             /* not, or, and */
86
 
#include <argp.h>               /* struct argp_option, error_t, struct
87
 
                                   argp_state, struct argp,
88
 
                                   argp_parse(), ARGP_KEY_ARG,
89
 
                                   ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
 
#include <signal.h>             /* sigemptyset(), sigaddset(),
91
 
                                   sigaction(), SIGTERM, sig_atomic_t,
92
 
                                   raise() */
93
 
#include <sysexits.h>           /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
 
                                   EX_NOHOST, EX_IOERR, EX_PROTOCOL */
 
82
                                   EIO, ENOENT, ENXIO, error_t,
 
83
                                   ENOMEM, EISDIR, ENOTEMPTY */
 
84
#include <stdio.h>              /* fprintf(), stderr, perror(), FILE,
 
85
                                   vfprintf(), off_t, SEEK_SET,
 
86
                                   stdout, fwrite(), ferror(),
 
87
                                   fflush(), asprintf() */
 
88
#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
 
89
#include <stdlib.h>             /* realloc(), free(), malloc(),
 
90
                                   getenv(), EXIT_FAILURE, setenv(),
 
91
                                   EXIT_SUCCESS, strtof(), strtod(),
 
92
                                   srand(), mkdtemp(), abort() */
 
93
#include <string.h>             /* strdup(), strcmp(), strlen(),
 
94
                                   strerror(), strncpy(), strspn(),
 
95
                                   memcpy(), strrchr(), strchr(),
 
96
                                   strsignal() */
 
97
#include <fcntl.h>              /* open(), O_RDONLY, O_DIRECTORY,
 
98
                                   O_PATH, O_CLOEXEC, openat(),
 
99
                                   O_NOFOLLOW, AT_REMOVEDIR */
 
100
#include <iso646.h>             /* or, and, not */
 
101
#include <sys/stat.h>           /* struct stat, fstat(), fstatat(),
 
102
                                   S_ISREG(), S_IXUSR, S_IXGRP,
 
103
                                   S_IXOTH, lstat() */
 
104
#include <net/if.h>             /* IF_NAMESIZE, if_indextoname(),
 
105
                                   if_nametoindex(), SIOCGIFFLAGS,
 
106
                                   IFF_LOOPBACK, IFF_POINTOPOINT,
 
107
                                   IFF_BROADCAST, IFF_NOARP, IFF_UP,
 
108
                                   IFF_RUNNING, SIOCSIFFLAGS */
 
109
#include <sysexits.h>           /* EX_NOPERM, EX_OSERR,
 
110
                                   EX_UNAVAILABLE, EX_USAGE */
 
111
#include <grp.h>                /* setgroups() */
95
112
#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
96
 
                                   WEXITSTATUS(), WTERMSIG() */
97
 
#include <grp.h>                /* setgroups() */
98
 
#include <argz.h>               /* argz_add_sep(), argz_next(),
99
 
                                   argz_delete(), argz_append(),
100
 
                                   argz_stringify(), argz_add(),
101
 
                                   argz_count() */
 
113
                                   WEXITSTATUS(), WIFSIGNALED(),
 
114
                                   WTERMSIG() */
 
115
#include <signal.h>             /* kill(), SIGTERM, struct sigaction,
 
116
                                   SIG_DFL, sigemptyset(),
 
117
                                   sigaddset(), SIGINT, SIGHUP,
 
118
                                   SIG_IGN, raise() */
 
119
#include <sys/socket.h>         /* struct sockaddr_storage, AF_INET6,
 
120
                                   PF_INET6, AF_INET, PF_INET,
 
121
                                   socket(), SOCK_STREAM,
 
122
                                   SOCK_CLOEXEC, struct sockaddr,
 
123
                                   connect(), SOCK_DGRAM */
 
124
#include <argz.h>               /* argz_next(), argz_add_sep(),
 
125
                                   argz_delete(), argz_stringify(),
 
126
                                   argz_add(), argz_count() */
 
127
#include <inttypes.h>           /* PRIuMAX, uintmax_t, uint32_t,
 
128
                                   PRIdMAX, PRIu16, intmax_t,
 
129
                                   strtoimax() */
 
130
#include <arpa/inet.h>          /* inet_pton() */
 
131
#include <stdint.h>             /* uint32_t, intptr_t, uint16_t */
102
132
#include <netdb.h>              /* getnameinfo(), NI_NUMERICHOST,
103
133
                                   EAI_SYSTEM, gai_strerror() */
 
134
#include <sys/ioctl.h>          /* ioctl() */
 
135
#include <dirent.h>             /* struct dirent, scandirat(),
 
136
                                   alphasort(), scandir() */
 
137
#include <limits.h>             /* INT_MAX */
104
138
 
105
139
#ifdef __linux__
106
140
#include <sys/klog.h>           /* klogctl() */
119
153
 
120
154
/* GnuTLS */
121
155
#include <gnutls/gnutls.h>      /* All GnuTLS types, constants and
122
 
                                   functions:
123
 
                                   gnutls_*
124
 
                                   init_gnutls_session(),
125
 
                                   GNUTLS_* */
 
156
                                   functions: gnutls_*, GNUTLS_* */
 
157
#if GNUTLS_VERSION_NUMBER < 0x030600
126
158
#include <gnutls/openpgp.h>
127
159
                         /* gnutls_certificate_set_openpgp_key_file(),
128
160
                            GNUTLS_OPENPGP_FMT_BASE64 */
 
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
 
162
#include <gnutls/x509.h>        /* GNUTLS_PKCS_PLAIN,
 
163
                                   GNUTLS_PKCS_NULL_PASSWORD */
 
164
#endif
129
165
 
130
166
/* GPGME */
131
167
#include <gpgme.h>              /* All GPGME types, constants and
132
168
                                   functions:
133
 
                                   gpgme_*
134
 
                                   GPGME_PROTOCOL_OpenPGP,
135
 
                                   GPG_ERR_NO_* */
 
169
                                   gpgme_*, GPG_ERR_NO_*,
 
170
                                   GPGME_IMPORT_*
 
171
                                   GPGME_PROTOCOL_OpenPGP */
136
172
 
137
173
#define BUFFER_SIZE 256
138
174
 
139
175
#define PATHDIR "/conf/conf.d/mandos"
140
176
#define SECKEY "seckey.txt"
141
177
#define PUBKEY "pubkey.txt"
 
178
#define TLS_PRIVKEY "tls-privkey.pem"
 
179
#define TLS_PUBKEY "tls-pubkey.pem"
142
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
181
 
144
182
bool debug = false;
272
310
  return true;
273
311
}
274
312
 
 
313
/* Set effective uid to 0, return errno */
 
314
__attribute__((warn_unused_result))
 
315
int raise_privileges(void){
 
316
  int old_errno = errno;
 
317
  int ret = 0;
 
318
  if(seteuid(0) == -1){
 
319
    ret = errno;
 
320
  }
 
321
  errno = old_errno;
 
322
  return ret;
 
323
}
 
324
 
 
325
/* Set effective and real user ID to 0.  Return errno. */
 
326
__attribute__((warn_unused_result))
 
327
int raise_privileges_permanently(void){
 
328
  int old_errno = errno;
 
329
  int ret = raise_privileges();
 
330
  if(ret != 0){
 
331
    errno = old_errno;
 
332
    return ret;
 
333
  }
 
334
  if(setuid(0) == -1){
 
335
    ret = errno;
 
336
  }
 
337
  errno = old_errno;
 
338
  return ret;
 
339
}
 
340
 
 
341
/* Set effective user ID to unprivileged saved user ID */
 
342
__attribute__((warn_unused_result))
 
343
int lower_privileges(void){
 
344
  int old_errno = errno;
 
345
  int ret = 0;
 
346
  if(seteuid(uid) == -1){
 
347
    ret = errno;
 
348
  }
 
349
  errno = old_errno;
 
350
  return ret;
 
351
}
 
352
 
 
353
/* Lower privileges permanently */
 
354
__attribute__((warn_unused_result))
 
355
int lower_privileges_permanently(void){
 
356
  int old_errno = errno;
 
357
  int ret = 0;
 
358
  if(setuid(uid) == -1){
 
359
    ret = errno;
 
360
  }
 
361
  errno = old_errno;
 
362
  return ret;
 
363
}
 
364
 
275
365
/* 
276
366
 * Initialize GPGME.
277
367
 */
297
387
      return false;
298
388
    }
299
389
    
 
390
    /* Workaround for systems without a real-time clock; see also
 
391
       Debian bug #894495: <https://bugs.debian.org/894495> */
 
392
    do {
 
393
      {
 
394
        time_t currtime = time(NULL);
 
395
        if(currtime != (time_t)-1){
 
396
          struct tm tm;
 
397
          if(gmtime_r(&currtime, &tm) == NULL) {
 
398
            perror_plus("gmtime_r");
 
399
            break;
 
400
          }
 
401
          if(tm.tm_year != 70 or tm.tm_mon != 0){
 
402
            break;
 
403
          }
 
404
          if(debug){
 
405
            fprintf_plus(stderr, "System clock is January 1970");
 
406
          }
 
407
        } else {
 
408
          if(debug){
 
409
            fprintf_plus(stderr, "System clock is invalid");
 
410
          }
 
411
        }
 
412
      }
 
413
      struct stat keystat;
 
414
      ret = fstat(fd, &keystat);
 
415
      if(ret != 0){
 
416
        perror_plus("fstat");
 
417
        break;
 
418
      }
 
419
      ret = raise_privileges();
 
420
      if(ret != 0){
 
421
        errno = ret;
 
422
        perror_plus("Failed to raise privileges");
 
423
        break;
 
424
      }
 
425
      if(debug){
 
426
        fprintf_plus(stderr,
 
427
                     "Setting system clock to key file mtime");
 
428
      }
 
429
      if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
 
430
        perror_plus("clock_settime");
 
431
      }
 
432
      ret = lower_privileges();
 
433
      if(ret != 0){
 
434
        errno = ret;
 
435
        perror_plus("Failed to lower privileges");
 
436
      }
 
437
    } while(false);
 
438
 
300
439
    rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
440
    if(rc != GPG_ERR_NO_ERROR){
302
441
      fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
597
736
                              const char *dhparamsfilename,
598
737
                              mandos_context *mc){
599
738
  int ret;
600
 
  unsigned int uret;
601
739
  
602
740
  if(debug){
603
741
    fprintf_plus(stderr, "Initializing GnuTLS\n");
620
758
  }
621
759
  
622
760
  if(debug){
623
 
    fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
624
 
                 " secret key %s as GnuTLS credentials\n",
 
761
    fprintf_plus(stderr, "Attempting to use public key %s and"
 
762
                 " private key %s as GnuTLS credentials\n",
625
763
                 pubkeyfilename,
626
764
                 seckeyfilename);
627
765
  }
628
766
  
 
767
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
768
  ret = gnutls_certificate_set_rawpk_key_file
 
769
    (mc->cred, pubkeyfilename, seckeyfilename,
 
770
     GNUTLS_X509_FMT_PEM,       /* format */
 
771
     NULL,                      /* pass */
 
772
     /* key_usage */
 
773
     GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
 
774
     NULL,                      /* names */
 
775
     0,                         /* names_length */
 
776
     /* privkey_flags */
 
777
     GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
 
778
     0);                        /* pkcs11_flags */
 
779
#elif GNUTLS_VERSION_NUMBER < 0x030600
629
780
  ret = gnutls_certificate_set_openpgp_key_file
630
781
    (mc->cred, pubkeyfilename, seckeyfilename,
631
782
     GNUTLS_OPENPGP_FMT_BASE64);
 
783
#else
 
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
785
#endif
632
786
  if(ret != GNUTLS_E_SUCCESS){
633
787
    fprintf_plus(stderr,
634
 
                 "Error[%d] while reading the OpenPGP key pair ('%s',"
 
788
                 "Error[%d] while reading the key pair ('%s',"
635
789
                 " '%s')\n", ret, pubkeyfilename, seckeyfilename);
636
790
    fprintf_plus(stderr, "The GnuTLS error is: %s\n",
637
791
                 safer_gnutls_strerror(ret));
708
862
  }
709
863
  if(dhparamsfilename == NULL){
710
864
    if(mc->dh_bits == 0){
 
865
#if GNUTLS_VERSION_NUMBER < 0x030600
711
866
      /* Find out the optimal number of DH bits */
712
867
      /* Try to read the private key file */
713
868
      gnutls_datum_t buffer = { .data = NULL, .size = 0 };
793
948
          }
794
949
        }
795
950
      }
796
 
      uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
 
951
      unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
952
      if(uret != 0){
798
953
        mc->dh_bits = uret;
799
954
        if(debug){
811
966
                     safer_gnutls_strerror(ret));
812
967
        goto globalfail;
813
968
      }
814
 
    } else if(debug){
815
 
      fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
 
                   mc->dh_bits);
817
 
    }
818
 
    ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
 
    if(ret != GNUTLS_E_SUCCESS){
820
 
      fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
 
                   " bits): %s\n", mc->dh_bits,
822
 
                   safer_gnutls_strerror(ret));
823
 
      goto globalfail;
 
969
#endif
 
970
    } else {                    /* dh_bits != 0 */
 
971
      if(debug){
 
972
        fprintf_plus(stderr, "DH bits explicitly set to %u\n",
 
973
                     mc->dh_bits);
 
974
      }
 
975
      ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
 
976
      if(ret != GNUTLS_E_SUCCESS){
 
977
        fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
 
978
                     " bits): %s\n", mc->dh_bits,
 
979
                     safer_gnutls_strerror(ret));
 
980
        goto globalfail;
 
981
      }
 
982
      gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
824
983
    }
825
984
  }
826
 
  gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
827
985
  
828
986
  return 0;
829
987
  
840
998
  int ret;
841
999
  /* GnuTLS session creation */
842
1000
  do {
843
 
    ret = gnutls_init(session, GNUTLS_SERVER);
 
1001
    ret = gnutls_init(session, (GNUTLS_SERVER
 
1002
#if GNUTLS_VERSION_NUMBER >= 0x030506
 
1003
                                | GNUTLS_NO_TICKETS
 
1004
#endif
 
1005
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
1006
                                | GNUTLS_ENABLE_RAWPK
 
1007
#endif
 
1008
                                ));
844
1009
    if(quit_now){
845
1010
      return -1;
846
1011
    }
894
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
895
1060
                      __attribute__((unused)) const char *txt){}
896
1061
 
897
 
/* Set effective uid to 0, return errno */
898
 
__attribute__((warn_unused_result))
899
 
int raise_privileges(void){
900
 
  int old_errno = errno;
901
 
  int ret = 0;
902
 
  if(seteuid(0) == -1){
903
 
    ret = errno;
904
 
  }
905
 
  errno = old_errno;
906
 
  return ret;
907
 
}
908
 
 
909
 
/* Set effective and real user ID to 0.  Return errno. */
910
 
__attribute__((warn_unused_result))
911
 
int raise_privileges_permanently(void){
912
 
  int old_errno = errno;
913
 
  int ret = raise_privileges();
914
 
  if(ret != 0){
915
 
    errno = old_errno;
916
 
    return ret;
917
 
  }
918
 
  if(setuid(0) == -1){
919
 
    ret = errno;
920
 
  }
921
 
  errno = old_errno;
922
 
  return ret;
923
 
}
924
 
 
925
 
/* Set effective user ID to unprivileged saved user ID */
926
 
__attribute__((warn_unused_result))
927
 
int lower_privileges(void){
928
 
  int old_errno = errno;
929
 
  int ret = 0;
930
 
  if(seteuid(uid) == -1){
931
 
    ret = errno;
932
 
  }
933
 
  errno = old_errno;
934
 
  return ret;
935
 
}
936
 
 
937
 
/* Lower privileges permanently */
938
 
__attribute__((warn_unused_result))
939
 
int lower_privileges_permanently(void){
940
 
  int old_errno = errno;
941
 
  int ret = 0;
942
 
  if(setuid(uid) == -1){
943
 
    ret = errno;
944
 
  }
945
 
  errno = old_errno;
946
 
  return ret;
947
 
}
948
 
 
949
1062
/* Helper function to add_local_route() and delete_local_route() */
950
1063
__attribute__((nonnull, warn_unused_result))
951
1064
static bool add_delete_local_route(const bool add,
990
1103
      ret = setgid(0);
991
1104
      if(ret == -1){
992
1105
        perror_plus("setgid");
 
1106
        close(devnull);
993
1107
        _exit(EX_NOPERM);
994
1108
      }
995
1109
      /* Reset supplementary groups */
997
1111
      ret = setgroups(0, NULL);
998
1112
      if(ret == -1){
999
1113
        perror_plus("setgroups");
 
1114
        close(devnull);
1000
1115
        _exit(EX_NOPERM);
1001
1116
      }
1002
1117
    }
1003
1118
    ret = dup2(devnull, STDIN_FILENO);
1004
1119
    if(ret == -1){
1005
1120
      perror_plus("dup2(devnull, STDIN_FILENO)");
 
1121
      close(devnull);
1006
1122
      _exit(EX_OSERR);
1007
1123
    }
1008
1124
    ret = close(devnull);
1009
1125
    if(ret == -1){
1010
1126
      perror_plus("close");
1011
 
      _exit(EX_OSERR);
1012
1127
    }
1013
1128
    ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
1129
    if(ret == -1){
1049
1164
  }
1050
1165
  if(pid == -1){
1051
1166
    perror_plus("fork");
 
1167
    close(devnull);
1052
1168
    return false;
1053
1169
  }
 
1170
  ret = close(devnull);
 
1171
  if(ret == -1){
 
1172
    perror_plus("close");
 
1173
  }
1054
1174
  int status;
1055
1175
  pid_t pret = -1;
1056
1176
  errno = 0;
2377
2497
 
2378
2498
int main(int argc, char *argv[]){
2379
2499
  mandos_context mc = { .server = NULL, .dh_bits = 0,
 
2500
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2501
                        .priority = "SECURE128:!CTYPE-X.509"
 
2502
                        ":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
 
2503
                        ":%PROFILE_ULTRA",
 
2504
#elif GNUTLS_VERSION_NUMBER < 0x030600
2380
2505
                        .priority = "SECURE256:!CTYPE-X.509"
2381
2506
                        ":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
 
2507
#else
 
2508
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
2509
#endif
2382
2510
                        .current_server = NULL, .interfaces = NULL,
2383
2511
                        .interfaces_size = 0 };
2384
2512
  AvahiSServiceBrowser *sb = NULL;
2395
2523
  AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2396
2524
  const char *seckey = PATHDIR "/" SECKEY;
2397
2525
  const char *pubkey = PATHDIR "/" PUBKEY;
 
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2527
  const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
 
2528
  const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
 
2529
#endif
2398
2530
  const char *dh_params_file = NULL;
2399
2531
  char *interfaces_hooks = NULL;
2400
2532
  
2448
2580
      { .name = "pubkey", .key = 'p',
2449
2581
        .arg = "FILE",
2450
2582
        .doc = "OpenPGP public key file base name",
2451
 
        .group = 2 },
 
2583
        .group = 1 },
 
2584
      { .name = "tls-privkey", .key = 't',
 
2585
        .arg = "FILE",
 
2586
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2587
        .doc = "TLS private key file base name",
 
2588
#else
 
2589
        .doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
 
2590
#endif
 
2591
        .group = 1 },
 
2592
      { .name = "tls-pubkey", .key = 'T',
 
2593
        .arg = "FILE",
 
2594
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2595
        .doc = "TLS public key file base name",
 
2596
#else
 
2597
        .doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
 
2598
#endif
 
2599
        .group = 1 },
2452
2600
      { .name = "dh-bits", .key = 129,
2453
2601
        .arg = "BITS",
2454
2602
        .doc = "Bit length of the prime number used in the"
2510
2658
      case 'p':                 /* --pubkey */
2511
2659
        pubkey = arg;
2512
2660
        break;
 
2661
      case 't':                 /* --tls-privkey */
 
2662
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2663
        tls_privkey = arg;
 
2664
#endif
 
2665
        break;
 
2666
      case 'T':                 /* --tls-pubkey */
 
2667
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
2668
        tls_pubkey = arg;
 
2669
#endif
 
2670
        break;
2513
2671
      case 129:                 /* --dh-bits */
2514
2672
        errno = 0;
2515
2673
        tmpmax = strtoimax(arg, &tmp, 10);
2550
2708
        argp_state_help(state, state->out_stream,
2551
2709
                        (ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2552
2710
                        & ~(unsigned int)ARGP_HELP_EXIT_OK);
 
2711
        __builtin_unreachable();
2553
2712
      case -3:                  /* --usage */
2554
2713
        argp_state_help(state, state->out_stream,
2555
2714
                        ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
 
2715
        __builtin_unreachable();
2556
2716
      case 'V':                 /* --version */
2557
2717
        fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2558
2718
        exit(argp_err_exit_status);
2585
2745
  }
2586
2746
  
2587
2747
  {
2588
 
    /* Work around Debian bug #633582:
2589
 
       <https://bugs.debian.org/633582> */
2590
 
    
2591
2748
    /* Re-raise privileges */
2592
2749
    ret = raise_privileges();
2593
2750
    if(ret != 0){
2596
2753
    } else {
2597
2754
      struct stat st;
2598
2755
      
 
2756
      /* Work around Debian bug #633582:
 
2757
         <https://bugs.debian.org/633582> */
 
2758
 
2599
2759
      if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2600
2760
        int seckey_fd = open(seckey, O_RDONLY);
2601
2761
        if(seckey_fd == -1){
2660
2820
        }
2661
2821
      }
2662
2822
      
 
2823
      /* Work around Debian bug #981302
 
2824
         <https://bugs.debian.org/981302> */
 
2825
      if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
 
2826
        ret = symlink("/proc/self/fd", "/dev/fd");
 
2827
        if(ret == -1){
 
2828
          perror_plus("Failed to create /dev/fd symlink");
 
2829
        }
 
2830
      }
 
2831
 
2663
2832
      /* Lower privileges */
2664
2833
      ret = lower_privileges();
2665
2834
      if(ret != 0){
2869
3038
    goto end;
2870
3039
  }
2871
3040
  
 
3041
#if GNUTLS_VERSION_NUMBER >= 0x030606
 
3042
  ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
 
3043
#elif GNUTLS_VERSION_NUMBER < 0x030600
2872
3044
  ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
 
3045
#else
 
3046
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
 
3047
#endif
2873
3048
  if(ret == -1){
2874
3049
    fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
3050
    exitcode = EX_UNAVAILABLE;