71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
74
getuid(), getgid(), setuid(),
76
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
80
80
argp_parse(), ARGP_KEY_ARG,
81
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
83
sigaction(), SIGTERM, sigaction,
87
87
#include <sys/klog.h> /* klogctl() */
474
474
static int init_gnutls_session(gnutls_session_t *session){
476
476
/* GnuTLS session creation */
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
480
478
if(ret != GNUTLS_E_SUCCESS){
481
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
480
safer_gnutls_strerror(ret));
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
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486
if(ret != GNUTLS_E_SUCCESS){
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487
fprintf(stderr, "Syntax error at: %s\n", err);
492
488
fprintf(stderr, "GnuTLS error: %s\n",
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
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497
if(ret != GNUTLS_E_SUCCESS){
504
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
499
safer_gnutls_strerror(ret));
510
504
/* ignore client certificate if any. */
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
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gnutls_certificate_server_set_request(*session,
513
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
519
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
515
__attribute__((unused)) const char *txt){}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
525
517
/* Called when a Mandos server is found */
526
518
static int start_mandos_communication(const char *ip, uint16_t port,
527
519
AvahiIfIndex if_index,
529
int ret, tcp_sd = -1;
532
524
struct sockaddr_in in;
536
528
char *decrypted_buffer;
537
529
size_t buffer_length = 0;
538
530
size_t buffer_capacity = 0;
531
ssize_t decrypted_buffer_size;
541
534
gnutls_session_t session;
542
535
int pf; /* Protocol family */
607
589
if(if_index == AVAHI_IF_UNSPEC){
608
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
591
" without a network interface\n");
613
594
/* Set the network interface number as scope */
614
595
to.in6.sin6_scope_id = (uint32_t)if_index;
706
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
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673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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676
ret = gnutls_handshake(session);
724
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
726
679
if(ret != GNUTLS_E_SUCCESS){
768
712
case GNUTLS_E_AGAIN:
770
714
case GNUTLS_E_REHANDSHAKE:
772
716
ret = gnutls_handshake(session);
777
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
779
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
798
738
fprintf(stderr, "Closing TLS session\n");
805
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
811
743
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
813
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
815
746
&decrypted_buffer);
816
747
if(decrypted_buffer_size >= 0){
819
749
while(written < (size_t) decrypted_buffer_size){
824
750
ret = (int)fwrite(decrypted_buffer + written, 1,
825
751
(size_t)decrypted_buffer_size - written,
878
sig_atomic_t quit_now = 0;
965
880
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
881
static void handle_sigterm(__attribute__((unused)) int sig){
971
signal_received = sig;
972
886
int old_errno = errno;
973
887
if(mc.simple_poll != NULL){
974
888
avahi_simple_poll_quit(mc.simple_poll);
1000
914
bool gpgme_initialized = false;
1001
915
float delay = 2.5f;
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
struct sigaction old_sigterm_action;
1004
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
/* Lower any group privileges we might have, just to be safe */
1016
/* Lower user privileges (temporarily) */
1028
921
struct argp_option options[] = {
1029
922
{ .name = "debug", .key = 128,
1156
1049
exitcode = EXIT_FAILURE;
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1203
1059
/* If the interface is down, bring it up */
1204
1060
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1216
/* Re-raise priviliges */
1223
1061
#ifdef __linux__
1224
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
1063
messages to mess up the prompt */
1265
1097
#endif /* __linux__ */
1266
1098
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1275
1101
if((network.ifr_flags & IFF_UP) == 0){
1276
1102
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1280
take_down_interface = false;
1281
1105
perror("ioctl SIOCSIFFLAGS");
1282
1106
exitcode = EXIT_FAILURE;
1283
1107
#ifdef __linux__
1357
1170
gnutls_initialized = true;
1364
tempdir_created = true;
1365
1173
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
1174
perror("mkdtemp");
1177
tempdir_created = true;
1375
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
1180
fprintf(stderr, "init_gpgme failed\n");
1380
1184
gpgme_initialized = true;
1187
if(interface[0] != '\0'){
1188
if_index = (AvahiIfIndex) if_nametoindex(interface);
1190
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1387
1196
if(connect_to != NULL){
1473
1259
/* Create the Avahi service browser */
1474
1260
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
1261
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1522
1304
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1313
perror("ioctl SIOCSIFFLAGS");
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1538
perror("ioctl SIOCSIFFLAGS");
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1545
/* Lower privileges permanently */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));