31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
55
64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
73
93
/* All Avahi types, constants and functions
340
425
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
356
443
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
358
445
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
446
if(ret != GNUTLS_E_SUCCESS){
361
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
450
fprintf(stderr, "The GnuTLS error is: %s\n",
364
451
safer_gnutls_strerror(ret));
368
455
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
389
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
396
483
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
485
ret = gnutls_init(session, GNUTLS_SERVER);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
399
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
492
safer_gnutls_strerror(ret));
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
500
gnutls_deinit(*session);
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
407
505
fprintf(stderr, "Syntax error at: %s\n", err);
408
506
fprintf(stderr, "GnuTLS error: %s\n",
409
507
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
508
gnutls_deinit(*session);
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
if (ret != GNUTLS_E_SUCCESS) {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
517
gnutls_deinit(*session);
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
418
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
523
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
524
gnutls_deinit(*session);
424
528
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
1011
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
1017
signal_received = sig;
1018
int old_errno = errno;
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1030
int good_interface(const struct dirent *if_entry){
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if(if_entry->d_name[0] == '.'){
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
751
int ret = asprintf(&tmp, "%s/%s", first, second);
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
/* Accept this device */
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
759
1120
int main(int argc, char *argv[]){
760
AvahiSServiceBrowser *sb = NULL;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
bool gnutls_initalized = false;
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that will be used to search for Mandos"
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory to read the OpenPGP key files from",
797
{ .name = "seckey", .key = 's',
799
.doc = "OpenPGP secret key file base name",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "OpenPGP public key file base name",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
810
{ .name = "priority", .key = 130,
812
.doc = "GnuTLS priority string for the TLS handshake",
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
822
case 128: /* --debug */
825
case 'c': /* --connect */
828
case 'i': /* --interface */
831
case 'd': /* --keydir */
834
case 's': /* --seckey */
837
case 'p': /* --pubkey */
840
case 129: /* --dh-bits */
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
848
case 130: /* --priority */
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
1121
AvahiSServiceBrowser *sb = NULL;
1126
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
1128
struct ifreq network;
1130
bool take_down_interface = false;
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1134
bool tempdir_created = false;
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1136
const char *seckey = PATHDIR "/" SECKEY;
1137
const char *pubkey = PATHDIR "/" PUBKEY;
1139
bool gnutls_initialized = false;
1140
bool gpgme_initialized = false;
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1149
/* Lower any group privileges we might have, just to be safe */
1156
/* Lower user privileges (temporarily) */
1168
struct argp_option options[] = {
1169
{ .name = "debug", .key = 128,
1170
.doc = "Debug mode", .group = 3 },
1171
{ .name = "connect", .key = 'c',
1172
.arg = "ADDRESS:PORT",
1173
.doc = "Connect directly to a specific Mandos server",
1175
{ .name = "interface", .key = 'i',
1177
.doc = "Network interface that will be used to search for"
1180
{ .name = "seckey", .key = 's',
1182
.doc = "OpenPGP secret key file base name",
1184
{ .name = "pubkey", .key = 'p',
1186
.doc = "OpenPGP public key file base name",
1188
{ .name = "dh-bits", .key = 129,
1190
.doc = "Bit length of the prime number used in the"
1191
" Diffie-Hellman key exchange",
1193
{ .name = "priority", .key = 130,
1195
.doc = "GnuTLS priority string for the TLS handshake",
1197
{ .name = "delay", .key = 131,
1199
.doc = "Maximum delay to wait for interface startup",
1202
* These reproduce what we would get without ARGP_NO_HELP
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
1213
error_t parse_opt(int key, char *arg,
1214
struct argp_state *state){
1217
case 128: /* --debug */
1220
case 'c': /* --connect */
1223
case 'i': /* --interface */
1226
case 's': /* --seckey */
1229
case 'p': /* --pubkey */
1232
case 129: /* --dh-bits */
1234
tmpmax = strtoimax(arg, &tmp, 10);
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1241
case 130: /* --priority */
1244
case 131: /* --delay */
1246
delay = strtof(arg, &tmp);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
1252
* These reproduce what we would get without ARGP_NO_HELP
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
1266
return ARGP_ERR_UNKNOWN;
1271
struct argp argp = { .options = options, .parser = parse_opt,
1273
.doc = "Mandos client -- Get and decrypt"
1274
" passwords from a Mandos server" };
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1287
exitcode = EX_USAGE;
1293
avahi_set_log_function(empty_log);
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1306
if(interface == NULL){
868
1309
exitcode = EXIT_FAILURE;
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
893
gnutls_initalized = true;
896
/* If the interface is down, bring it up */
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
901
exitcode = EXIT_FAILURE;
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
from the signal handler */
1323
/* Initialize the pseudo-RNG for Avahi */
1324
srand((unsigned int) time(NULL));
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1332
sigemptyset(&sigterm_action.sa_mask);
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1335
perror("sigaddset");
1336
exitcode = EX_OSERR;
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1341
perror("sigaddset");
1342
exitcode = EX_OSERR;
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1357
perror("sigaction");
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1370
perror("sigaction");
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1383
perror("sigaction");
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
936
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
1398
if(if_index == 0){
938
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
962
exitcode = EXIT_FAILURE;
964
exitcode = EXIT_SUCCESS;
970
avahi_set_log_function(empty_log);
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
981
exitcode = EXIT_FAILURE;
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1023
/* Run the main loop */
1026
fprintf(stderr, "Starting Avahi loop search\n");
1029
avahi_simple_poll_loop(mc.simple_poll);
1400
exitcode = EX_UNAVAILABLE;
1408
/* Re-raise priviliges */
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1421
restore_loglevel = false;
1424
#endif /* __linux__ */
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
exitcode = EX_OSERR;
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1449
perror("ioctl SIOCGIFFLAGS");
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1524
if(take_down_interface){
1525
/* Lower privileges */
1531
/* Lower privileges permanently */
1543
ret = init_gnutls_global(pubkey, seckey);
1545
fprintf(stderr, "init_gnutls_global failed\n");
1546
exitcode = EX_UNAVAILABLE;
1549
gnutls_initialized = true;
1556
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
1569
exitcode = EX_UNAVAILABLE;
1572
gpgme_initialized = true;
1579
if(connect_to != NULL){
1580
/* Connect directly, do not use Zeroconf */
1581
/* (Mainly meant for debugging) */
1582
char *address = strrchr(connect_to, ':');
1583
if(address == NULL){
1584
fprintf(stderr, "No colon in address\n");
1585
exitcode = EX_USAGE;
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
1599
exitcode = EX_USAGE;
1607
port = (uint16_t)tmpmax;
1609
address = connect_to;
1610
/* Colon in address indicates IPv6 */
1612
if(strchr(address, ':') != NULL){
1622
ret = start_mandos_communication(address, port, if_index, af);
1628
exitcode = EX_NOHOST;
1631
exitcode = EX_USAGE;
1634
exitcode = EX_IOERR;
1637
exitcode = EX_PROTOCOL;
1640
exitcode = EX_OSERR;
1644
exitcode = EXIT_SUCCESS;
1654
AvahiServerConfig config;
1655
/* Do not publish any local Zeroconf records */
1656
avahi_server_config_init(&config);
1657
config.publish_hinfo = 0;
1658
config.publish_addresses = 0;
1659
config.publish_workstation = 0;
1660
config.publish_domain = 0;
1662
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1667
/* Free the Avahi configuration data */
1668
avahi_server_config_free(&config);
1671
/* Check if creating the Avahi server object succeeded */
1672
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1683
/* Create the Avahi service browser */
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1698
/* Run the main loop */
1701
fprintf(stderr, "Starting Avahi loop search\n");
1704
avahi_simple_poll_loop(mc.simple_poll);
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1037
/* Cleanup things */
1039
avahi_s_service_browser_free(sb);
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1709
fprintf(stderr, "%s exiting\n", argv[0]);
1712
/* Cleanup things */
1714
avahi_s_service_browser_free(sb);
1716
if(mc.server != NULL)
1717
avahi_server_free(mc.server);
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
1722
if(gnutls_initialized){
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
gnutls_dh_params_deinit(mc.dh_params);
1728
if(gpgme_initialized){
1729
gpgme_release(mc.ctx);
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1755
/* Lower privileges permanently */
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1770
if(errno != ENOENT){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1793
ret = remove(fullname);
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1815
perror("sigaction");
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1824
TEMP_FAILURE_RETRY(pause());