71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
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, sigaction,
83
sigaction(), SIGTERM, sig_atomic_t,
87
87
#include <sys/klog.h> /* klogctl() */
310
310
gpgme_recipient_t recipient;
311
311
recipient = result->recipients;
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
320
recipient = recipient->next;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
319
recipient = recipient->next;
476
474
static int init_gnutls_session(gnutls_session_t *session){
478
476
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
480
if(ret != GNUTLS_E_SUCCESS){
481
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
482
safer_gnutls_strerror(ret));
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
490
if(ret != GNUTLS_E_SUCCESS){
489
491
fprintf(stderr, "Syntax error at: %s\n", err);
490
492
fprintf(stderr, "GnuTLS error: %s\n",
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
503
if(ret != GNUTLS_E_SUCCESS){
500
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
505
safer_gnutls_strerror(ret));
506
510
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
510
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
516
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
520
__attribute__((unused)) const char *txt){}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
519
525
/* Called when a Mandos server is found */
520
526
static int start_mandos_communication(const char *ip, uint16_t port,
521
527
AvahiIfIndex if_index,
529
int ret, tcp_sd = -1;
526
532
struct sockaddr_in in;
530
536
char *decrypted_buffer;
531
537
size_t buffer_length = 0;
532
538
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
536
541
gnutls_session_t session;
537
542
int pf; /* Protocol family */
561
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
563
572
perror("socket");
567
581
memset(&to, 0, sizeof(to));
568
582
if(af == AF_INET6){
569
to.in6.sin6_family = (uint16_t)af;
583
to.in6.sin6_family = (sa_family_t)af;
570
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
585
} else { /* IPv4 */
572
586
to.in.sin_family = (sa_family_t)af;
591
607
if(if_index == AVAHI_IF_UNSPEC){
592
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
609
" without a network interface\n");
596
613
/* Set the network interface number as scope */
597
614
to.in6.sin6_scope_id = (uint32_t)if_index;
672
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
675
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
678
720
ret = gnutls_handshake(session);
679
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
681
726
if(ret != GNUTLS_E_SUCCESS){
714
768
case GNUTLS_E_AGAIN:
716
770
case GNUTLS_E_REHANDSHAKE:
718
772
ret = gnutls_handshake(session);
719
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
740
798
fprintf(stderr, "Closing TLS session\n");
743
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
745
811
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
746
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
748
815
&decrypted_buffer);
749
816
if(decrypted_buffer_size >= 0){
751
819
while(written < (size_t) decrypted_buffer_size){
752
824
ret = (int)fwrite(decrypted_buffer + written, 1,
753
825
(size_t)decrypted_buffer_size - written,
880
sig_atomic_t quit_now = 0;
882
965
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
966
static void handle_sigterm(int sig){
971
signal_received = sig;
888
972
int old_errno = errno;
889
973
if(mc.simple_poll != NULL){
890
974
avahi_simple_poll_quit(mc.simple_poll);
915
1000
bool gpgme_initialized = false;
916
1001
float delay = 2.5f;
918
struct sigaction old_sigterm_action;
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1004
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) */
922
1028
struct argp_option options[] = {
923
1029
{ .name = "debug", .key = 128,
1050
1156
exitcode = EXIT_FAILURE;
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
perror("sigaction");
1056
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;
1060
1203
/* If the interface is down, bring it up */
1061
1204
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 */
1062
1223
#ifdef __linux__
1063
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
1225
messages to mess up the prompt */
1098
1265
#endif /* __linux__ */
1099
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1102
1275
if((network.ifr_flags & IFF_UP) == 0){
1103
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1104
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1280
take_down_interface = false;
1106
1281
perror("ioctl SIOCSIFFLAGS");
1107
1282
exitcode = EXIT_FAILURE;
1108
1283
#ifdef __linux__
1168
1357
gnutls_initialized = true;
1364
tempdir_created = true;
1171
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1172
1367
perror("mkdtemp");
1175
tempdir_created = true;
1177
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
1376
fprintf(stderr, "init_gpgme failed\n");
1182
1380
gpgme_initialized = true;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1194
1387
if(connect_to != NULL){
1257
1473
/* Create the Avahi service browser */
1258
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1299
1519
gpgme_release(mc.ctx);
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
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 */
1302
1554
/* Removes the temp directory used by GPGME */
1303
1555
if(tempdir_created){