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(), sleep() */
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>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
74
getuid(), getgid(), seteuid(),
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
430
gnutls_global_deinit();
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
356
440
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
441
(mc.cred, pubkeyfilename, seckeyfilename,
358
442
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
443
if(ret != GNUTLS_E_SUCCESS){
361
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
447
fprintf(stderr, "The GnuTLS error is: %s\n",
364
448
safer_gnutls_strerror(ret));
368
452
/* 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));
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));
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
453
ret = gnutls_dh_params_init(&mc.dh_params);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
472
gnutls_certificate_free_credentials(mc.cred);
389
473
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
478
static int init_gnutls_session(gnutls_session_t *session){
397
480
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
482
ret = gnutls_init(session, GNUTLS_SERVER);
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
if(ret != GNUTLS_E_SUCCESS){
400
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
489
safer_gnutls_strerror(ret));
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
gnutls_deinit(*session);
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
if(ret != GNUTLS_E_SUCCESS){
408
502
fprintf(stderr, "Syntax error at: %s\n", err);
409
503
fprintf(stderr, "GnuTLS error: %s\n",
410
504
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
505
gnutls_deinit(*session);
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
if (ret != GNUTLS_E_SUCCESS) {
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
514
gnutls_deinit(*session);
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
if(ret != GNUTLS_E_SUCCESS){
419
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
520
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
521
gnutls_deinit(*session);
425
525
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
1010
/* stop main loop after sigterm has been called */
1011
static void handle_sigterm(int sig){
1016
signal_received = sig;
1017
int old_errno = errno;
1018
if(mc.simple_poll != NULL){
1019
avahi_simple_poll_quit(mc.simple_poll);
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1029
int good_interface(const struct dirent *if_entry){
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
752
int ret = asprintf(&tmp, "%s/%s", first, second);
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1089
/* Reject the loopback device */
1090
if(flags & IFF_LOOPBACK){
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1097
/* Accept point-to-point devices only if connect_to is specified */
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1105
/* Otherwise, reject non-broadcast-capable devices */
1106
if(not (flags & IFF_BROADCAST)){
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1114
if(flags & IFF_NOARP){
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1121
/* Accept this device */
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
760
1129
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
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',
786
.doc = "Connect directly to a sepcified mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that Avahi will conntect through",
792
{ .name = "keydir", .key = 'd',
794
.doc = "Directory where the openpgp keyring is",
796
{ .name = "seckey", .key = 's',
798
.doc = "Secret openpgp key for gnutls authentication",
800
{ .name = "pubkey", .key = 'p',
802
.doc = "Public openpgp key for gnutls authentication",
804
{ .name = "dh-bits", .key = 129,
806
.doc = "dh-bits to use in gnutls communication",
808
{ .name = "priority", .key = 130,
810
.doc = "GNUTLS priority", .group = 1 },
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
854
return ARGP_ERR_UNKNOWN;
859
struct argp argp = { .options = options, .parser = parse_opt,
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
1130
AvahiSServiceBrowser *sb = NULL;
1135
int exitcode = EXIT_SUCCESS;
1136
const char *interface = "";
1137
struct ifreq network;
1139
bool take_down_interface = false;
1142
char tempdir[] = "/tmp/mandosXXXXXX";
1143
bool tempdir_created = false;
1144
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1145
const char *seckey = PATHDIR "/" SECKEY;
1146
const char *pubkey = PATHDIR "/" PUBKEY;
1148
bool gnutls_initialized = false;
1149
bool gpgme_initialized = false;
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1158
/* Lower any group privileges we might have, just to be safe */
1165
/* Lower user privileges (temporarily) */
1177
struct argp_option options[] = {
1178
{ .name = "debug", .key = 128,
1179
.doc = "Debug mode", .group = 3 },
1180
{ .name = "connect", .key = 'c',
1181
.arg = "ADDRESS:PORT",
1182
.doc = "Connect directly to a specific Mandos server",
1184
{ .name = "interface", .key = 'i',
1186
.doc = "Network interface that will be used to search for"
1189
{ .name = "seckey", .key = 's',
1191
.doc = "OpenPGP secret key file base name",
1193
{ .name = "pubkey", .key = 'p',
1195
.doc = "OpenPGP public key file base name",
1197
{ .name = "dh-bits", .key = 129,
1199
.doc = "Bit length of the prime number used in the"
1200
" Diffie-Hellman key exchange",
1202
{ .name = "priority", .key = 130,
1204
.doc = "GnuTLS priority string for the TLS handshake",
1206
{ .name = "delay", .key = 131,
1208
.doc = "Maximum delay to wait for interface startup",
1211
* These reproduce what we would get without ARGP_NO_HELP
1213
{ .name = "help", .key = '?',
1214
.doc = "Give this help list", .group = -1 },
1215
{ .name = "usage", .key = -3,
1216
.doc = "Give a short usage message", .group = -1 },
1217
{ .name = "version", .key = 'V',
1218
.doc = "Print program version", .group = -1 },
1222
error_t parse_opt(int key, char *arg,
1223
struct argp_state *state){
1226
case 128: /* --debug */
1229
case 'c': /* --connect */
1232
case 'i': /* --interface */
1235
case 's': /* --seckey */
1238
case 'p': /* --pubkey */
1241
case 129: /* --dh-bits */
1243
tmpmax = strtoimax(arg, &tmp, 10);
1244
if(errno != 0 or tmp == arg or *tmp != '\0'
1245
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1246
argp_error(state, "Bad number of DH bits");
1248
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1250
case 130: /* --priority */
1253
case 131: /* --delay */
1255
delay = strtof(arg, &tmp);
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
1257
argp_error(state, "Bad delay");
1261
* These reproduce what we would get without ARGP_NO_HELP
1263
case '?': /* --help */
1264
argp_state_help(state, state->out_stream,
1265
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1266
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1267
case -3: /* --usage */
1268
argp_state_help(state, state->out_stream,
1269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1270
case 'V': /* --version */
1271
fprintf(state->out_stream, "%s\n", argp_program_version);
1272
exit(argp_err_exit_status);
1275
return ARGP_ERR_UNKNOWN;
1280
struct argp argp = { .options = options, .parser = parse_opt,
1282
.doc = "Mandos client -- Get and decrypt"
1283
" passwords from a Mandos server" };
1284
ret = argp_parse(&argp, argc, argv,
1285
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1292
perror("argp_parse");
1293
exitcode = EX_OSERR;
1296
exitcode = EX_USAGE;
1302
avahi_set_log_function(empty_log);
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1315
if(interface == NULL){
866
1318
exitcode = EXIT_FAILURE;
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
891
gnutls_initalized = true;
894
/* If the interface is down, bring it up */
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
exitcode = EXIT_FAILURE;
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1330
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1331
from the signal handler */
1332
/* Initialize the pseudo-RNG for Avahi */
1333
srand((unsigned int) time(NULL));
1334
mc.simple_poll = avahi_simple_poll_new();
1335
if(mc.simple_poll == NULL){
1336
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1337
exitcode = EX_UNAVAILABLE;
1341
sigemptyset(&sigterm_action.sa_mask);
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1344
perror("sigaddset");
1345
exitcode = EX_OSERR;
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1350
perror("sigaddset");
1351
exitcode = EX_OSERR;
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1356
perror("sigaddset");
1357
exitcode = EX_OSERR;
1360
/* Need to check if the handler is SIG_IGN before handling:
1361
| [[info:libc:Initial Signal Actions]] |
1362
| [[info:libc:Basic Signal Handling]] |
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1366
perror("sigaction");
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1372
perror("sigaction");
1373
exitcode = EX_OSERR;
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1379
perror("sigaction");
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1385
perror("sigaction");
1386
exitcode = EX_OSERR;
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1392
perror("sigaction");
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1398
perror("sigaction");
1399
exitcode = EX_OSERR;
1404
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
934
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
1407
if(if_index == 0){
936
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
960
exitcode = EXIT_FAILURE;
962
exitcode = EXIT_SUCCESS;
968
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1021
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
1409
exitcode = EX_UNAVAILABLE;
1417
/* Re-raise priviliges */
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1427
ret = klogctl(8, NULL, 5);
1428
bool restore_loglevel = true;
1430
restore_loglevel = false;
1433
#endif /* __linux__ */
1435
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1438
exitcode = EX_OSERR;
1440
if(restore_loglevel){
1441
ret = klogctl(7, NULL, 0);
1446
#endif /* __linux__ */
1447
/* Lower privileges */
1455
strcpy(network.ifr_name, interface);
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1458
perror("ioctl SIOCGIFFLAGS");
1460
if(restore_loglevel){
1461
ret = klogctl(7, NULL, 0);
1466
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1476
if((network.ifr_flags & IFF_UP) == 0){
1477
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1485
if(restore_loglevel){
1486
ret = klogctl(7, NULL, 0);
1491
#endif /* __linux__ */
1492
/* Lower privileges */
1501
/* sleep checking until interface is running */
1502
for(int i=0; i < delay * 4; i++){
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1505
perror("ioctl SIOCGIFFLAGS");
1506
} else if(network.ifr_flags & IFF_RUNNING){
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1510
ret = nanosleep(&sleeptime, NULL);
1511
if(ret == -1 and errno != EINTR){
1512
perror("nanosleep");
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1523
if(restore_loglevel){
1524
/* Restores kernel loglevel to default */
1525
ret = klogctl(7, NULL, 0);
1530
#endif /* __linux__ */
1531
/* Lower privileges */
1533
if(take_down_interface){
1534
/* Lower privileges */
1540
/* Lower privileges permanently */
1552
ret = init_gnutls_global(pubkey, seckey);
1554
fprintf(stderr, "init_gnutls_global failed\n");
1555
exitcode = EX_UNAVAILABLE;
1558
gnutls_initialized = true;
1565
tempdir_created = true;
1566
if(mkdtemp(tempdir) == NULL){
1567
tempdir_created = false;
1576
if(not init_gpgme(pubkey, seckey, tempdir)){
1577
fprintf(stderr, "init_gpgme failed\n");
1578
exitcode = EX_UNAVAILABLE;
1581
gpgme_initialized = true;
1588
if(connect_to != NULL){
1589
/* Connect directly, do not use Zeroconf */
1590
/* (Mainly meant for debugging) */
1591
char *address = strrchr(connect_to, ':');
1592
if(address == NULL){
1593
fprintf(stderr, "No colon in address\n");
1594
exitcode = EX_USAGE;
1604
tmpmax = strtoimax(address+1, &tmp, 10);
1605
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1606
or tmpmax != (uint16_t)tmpmax){
1607
fprintf(stderr, "Bad port number\n");
1608
exitcode = EX_USAGE;
1616
port = (uint16_t)tmpmax;
1618
address = connect_to;
1619
/* Colon in address indicates IPv6 */
1621
if(strchr(address, ':') != NULL){
1631
while(not quit_now){
1632
ret = start_mandos_communication(address, port, if_index, af);
1633
if(quit_now or ret == 0){
1640
exitcode = EXIT_SUCCESS;
1651
AvahiServerConfig config;
1652
/* Do not publish any local Zeroconf records */
1653
avahi_server_config_init(&config);
1654
config.publish_hinfo = 0;
1655
config.publish_addresses = 0;
1656
config.publish_workstation = 0;
1657
config.publish_domain = 0;
1659
/* Allocate a new server */
1660
mc.server = avahi_server_new(avahi_simple_poll_get
1661
(mc.simple_poll), &config, NULL,
1664
/* Free the Avahi configuration data */
1665
avahi_server_config_free(&config);
1668
/* Check if creating the Avahi server object succeeded */
1669
if(mc.server == NULL){
1670
fprintf(stderr, "Failed to create Avahi server: %s\n",
1671
avahi_strerror(error));
1672
exitcode = EX_UNAVAILABLE;
1680
/* Create the Avahi service browser */
1681
sb = avahi_s_service_browser_new(mc.server, if_index,
1682
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1683
NULL, 0, browse_callback, NULL);
1685
fprintf(stderr, "Failed to create service browser: %s\n",
1686
avahi_strerror(avahi_server_errno(mc.server)));
1687
exitcode = EX_UNAVAILABLE;
1695
/* Run the main loop */
1698
fprintf(stderr, "Starting Avahi loop search\n");
1701
avahi_simple_poll_loop(mc.simple_poll);
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1035
/* Cleanup things */
1037
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1706
fprintf(stderr, "%s exiting\n", argv[0]);
1709
/* Cleanup things */
1711
avahi_s_service_browser_free(sb);
1713
if(mc.server != NULL)
1714
avahi_server_free(mc.server);
1716
if(mc.simple_poll != NULL)
1717
avahi_simple_poll_free(mc.simple_poll);
1719
if(gnutls_initialized){
1720
gnutls_certificate_free_credentials(mc.cred);
1721
gnutls_global_deinit();
1722
gnutls_dh_params_deinit(mc.dh_params);
1725
if(gpgme_initialized){
1726
gpgme_release(mc.ctx);
1729
/* Take down the network interface */
1730
if(take_down_interface){
1731
/* Re-raise priviliges */
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
/* Lower privileges permanently */
1761
/* Removes the temp directory used by GPGME */
1762
if(tempdir_created){
1764
struct dirent *direntry;
1765
d = opendir(tempdir);
1767
if(errno != ENOENT){
1772
direntry = readdir(d);
1773
if(direntry == NULL){
1776
/* Skip "." and ".." */
1777
if(direntry->d_name[0] == '.'
1778
and (direntry->d_name[1] == '\0'
1779
or (direntry->d_name[1] == '.'
1780
and direntry->d_name[2] == '\0'))){
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1790
ret = remove(fullname);
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1799
ret = rmdir(tempdir);
1800
if(ret == -1 and errno != ENOENT){
1806
sigemptyset(&old_sigterm_action.sa_mask);
1807
old_sigterm_action.sa_handler = SIG_DFL;
1808
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1809
&old_sigterm_action,
1812
perror("sigaction");
1815
ret = raise(signal_received);
1816
} while(ret != 0 and errno == EINTR);
1821
TEMP_FAILURE_RETRY(pause());