206
131
return buffer_capacity;
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
218
*new_server = (server){ .ip = strdup(ip),
220
.if_index = if_index,
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
perror_plus("clock_gettime");
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
251
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
252
148
gpgme_engine_info_t engine_info;
256
* Helper function to insert pub and seckey to the engine keyring.
258
bool import_key(const char *filename){
261
gpgme_data_t pgp_data;
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
276
rc = gpgme_op_import(mc.ctx, pgp_data);
277
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
perror_plus("close");
287
gpgme_data_release(pgp_data);
292
fprintf_plus(stderr, "Initializing GPGME\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
296
155
gpgme_check_version(NULL);
297
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
304
163
/* Set GPGME home directory for the OpenPGP engine only */
305
rc = gpgme_get_engine_info(&engine_info);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
311
170
while(engine_info != NULL){
312
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
313
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
314
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
317
176
engine_info = engine_info->next;
319
178
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc.ctx));
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
if(not import_key(pubkey) or not import_key(seckey)){
342
* Decrypt OpenPGP data.
343
* Returns -1 on error
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
348
gpgme_data_t dh_crypto, dh_plain;
351
size_t plaintext_capacity = 0;
352
ssize_t plaintext_length = 0;
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
358
183
/* Create new GPGME data buffer from memory cryptotext */
359
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
367
192
/* Create new empty GPGME data buffer for the plaintext */
368
193
rc = gpgme_data_new(&dh_plain);
369
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
373
197
gpgme_data_release(dh_crypto);
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
377
210
/* Decrypt data from the cryptotext data buffer to the plaintext
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
383
216
plaintext_length = -1;
385
218
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
219
result = gpgme_op_decrypt_result(ctx);
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
394
227
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
228
fprintf(stderr, "File name: %s\n", result->file_name);
397
230
gpgme_recipient_t recipient;
398
231
recipient = result->recipients;
399
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
407
recipient = recipient->next;
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
240
recipient = recipient->next;
621
437
/* Called when a Mandos server is found */
622
438
static int start_mandos_communication(const char *ip, uint16_t port,
623
439
AvahiIfIndex if_index,
625
int ret, tcp_sd = -1;
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
443
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
444
char *decrypted_buffer;
633
445
size_t buffer_length = 0;
634
446
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
450
char interface[IF_NAMESIZE];
637
451
gnutls_session_t session;
638
int pf; /* Protocol family */
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
660
ret = init_gnutls_session(&session);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
673
perror_plus("socket");
453
ret = init_gnutls_session (mc, &session);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
474
fprintf(stderr, "Binding to interface %s\n", interface);
683
477
memset(&to, 0, sizeof(to));
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
693
perror_plus("inet_pton");
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
706
-Wunreachable-code */
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
711
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
717
/* Set the network interface number as scope */
718
to.in6.sin6_scope_id = (uint32_t)if_index;
721
to.in.sin_port = htons(port); /* Spurious warnings from
723
-Wunreachable-code */
487
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
492
to.in6.sin6_scope_id = (uint32_t)if_index;
732
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
char interface[IF_NAMESIZE];
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
755
perror_plus("inet_ntop");
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
757
502
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
776
perror_plus("connect");
508
ret = connect(tcp_sd, &to.in, sizeof(to));
787
514
const char *out = mandos_protocol_version;
790
517
size_t out_size = strlen(out);
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
795
perror_plus("write");
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
799
525
written += (size_t)ret;
800
526
if(written < out_size){
803
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
838
ret = gnutls_handshake(session);
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
ret = gnutls_handshake (session);
843
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
845
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
854
557
/* Read OpenPGP packet that contains the wanted password */
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
868
buffer_capacity = incbuffer(&buffer, buffer_length,
870
if(buffer_capacity == 0){
872
perror_plus("incbuffer");
882
sret = gnutls_record_recv(session, buffer+buffer_length,
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
573
ret = gnutls_record_recv(session, buffer+buffer_length,
889
580
case GNUTLS_E_INTERRUPTED:
890
581
case GNUTLS_E_AGAIN:
892
583
case GNUTLS_E_REHANDSHAKE:
894
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
900
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
917
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
922
fprintf_plus(stderr, "Closing TLS session\n");
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
938
if(buffer_length > 0){
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
942
if(decrypted_buffer_size >= 0){
607
fprintf(stderr, "Closing TLS session\n");
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
617
if (decrypted_buffer_size >= 0){
945
619
while(written < (size_t) decrypted_buffer_size){
951
ret = (int)fwrite(decrypted_buffer + written, 1,
952
(size_t)decrypted_buffer_size - written,
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
954
623
if(ret == 0 and ferror(stdout)){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
625
fprintf(stderr, "Error writing encrypted data: %s\n",
963
631
written += (size_t)ret;
633
free(decrypted_buffer);
969
641
/* Shutdown procedure */
974
free(decrypted_buffer);
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
983
perror_plus("close");
985
gnutls_deinit(session);
646
gnutls_deinit (session);
995
650
static void resolve_callback(AvahiSServiceResolver *r,
996
651
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
998
653
AvahiResolverEvent event,
999
654
const char *name,
1000
655
const char *type,
1097
738
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
739
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1100
fprintf_plus(stderr, "No Mandos server found, still"
741
fprintf(stderr, "No Mandos server found, still searching...\n");
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
1113
signal_received = sig;
1114
int old_errno = errno;
1115
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1127
perror_plus("socket");
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1134
perror_plus("ioctl SIOCGIFFLAGS");
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1176
/* Accept this device */
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1194
if(not get_flags(if_entry->d_name, &ifr)){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1202
if(not good_flags(if_entry->d_name, &ifr)){
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1219
if(not get_flags(if_entry->d_name, &ifr)){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1245
if(not good_flags(if_entry->d_name, &ifr)){
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1268
if((direntry->d_name)[0] == '\0'){
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
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){
751
int ret = asprintf(&tmp, "%s/%s", first, second);
1289
perror_plus("asprintf");
1293
ret = stat(fullname, &st);
1296
perror_plus("Could not stat hook");
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1330
if(mc.current_server == NULL){
1332
fprintf_plus(stderr, "Wait until first server is found."
1335
ret = avahi_simple_poll_iterate(s, -1);
1338
fprintf_plus(stderr, "Check current_server if we should run"
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1344
perror_plus("clock_gettime");
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1371
avahi_simple_poll_quit(mc.simple_poll);
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1377
perror_plus("clock_gettime");
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1438
bool run_network_hooks(const char *mode, const char *interface,
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1446
perror_plus("scandir");
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1454
perror_plus("asprintf");
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1461
pid_t hook_pid = fork();
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1470
perror_plus("setgid");
1472
/* Reset supplementary groups */
1474
ret = setgroups(0, NULL);
1476
perror_plus("setgroups");
1478
dup2(devnull, STDIN_FILENO);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1483
perror_plus("setenv");
1486
ret = setenv("DEVICE", interface, 1);
1488
perror_plus("setenv");
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1493
perror_plus("setenv");
1496
ret = setenv("MODE", mode, 1);
1498
perror_plus("setenv");
1502
ret = asprintf(&delaystring, "%f", delay);
1504
perror_plus("asprintf");
1507
ret = setenv("DELAY", delaystring, 1);
1510
perror_plus("setenv");
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1517
perror_plus("setenv");
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1564
int bring_up_interface(const char * const interface, const float delay){
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
return EX_UNAVAILABLE;
1578
/* Re-raise priviliges */
1582
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1583
messages about the network interface to mess up the prompt */
1584
ret = klogctl(8, NULL, 5);
1585
bool restore_loglevel = true;
1587
restore_loglevel = false;
1588
perror_plus("klogctl");
1590
#endif /* __linux__ */
1592
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
perror_plus("socket");
1596
if(restore_loglevel){
1597
ret = klogctl(7, NULL, 0);
1599
perror_plus("klogctl");
1602
#endif /* __linux__ */
1603
/* Lower privileges */
1608
strcpy(network.ifr_name, interface);
1609
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1611
perror_plus("ioctl SIOCGIFFLAGS");
1613
if(restore_loglevel){
1614
ret = klogctl(7, NULL, 0);
1616
perror_plus("klogctl");
1619
#endif /* __linux__ */
1620
/* Lower privileges */
1624
if((network.ifr_flags & IFF_UP) == 0){
1625
network.ifr_flags |= IFF_UP;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1628
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
if(restore_loglevel){
1631
ret = klogctl(7, NULL, 0);
1633
perror_plus("klogctl");
1636
#endif /* __linux__ */
1637
/* Lower privileges */
1642
/* Sleep checking until interface is running.
1643
Check every 0.25s, up to total time of delay */
1644
for(int i=0; i < delay * 4; i++){
1645
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1647
perror_plus("ioctl SIOCGIFFLAGS");
1648
} else if(network.ifr_flags & IFF_RUNNING){
1651
struct timespec sleeptime = { .tv_nsec = 250000000 };
1652
ret = nanosleep(&sleeptime, NULL);
1653
if(ret == -1 and errno != EINTR){
1654
perror_plus("nanosleep");
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1660
perror_plus("close");
1663
if(restore_loglevel){
1664
/* Restores kernel loglevel to default */
1665
ret = klogctl(7, NULL, 0);
1667
perror_plus("klogctl");
1670
#endif /* __linux__ */
1671
/* Lower privileges */
1676
759
int main(int argc, char *argv[]){
1677
AvahiSServiceBrowser *sb = NULL;
1682
int exitcode = EXIT_SUCCESS;
1683
const char *interface = "";
1684
struct ifreq network;
1686
bool take_down_interface = false;
1687
char tempdir[] = "/tmp/mandosXXXXXX";
1688
bool tempdir_created = false;
1689
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1690
const char *seckey = PATHDIR "/" SECKEY;
1691
const char *pubkey = PATHDIR "/" PUBKEY;
1693
bool gnutls_initialized = false;
1694
bool gpgme_initialized = false;
1696
double retry_interval = 10; /* 10s between trying a server and
1697
retrying the same server again */
1699
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1700
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1705
/* Lower any group privileges we might have, just to be safe */
1709
perror_plus("setgid");
1712
/* Lower user privileges (temporarily) */
1716
perror_plus("seteuid");
1724
struct argp_option options[] = {
1725
{ .name = "debug", .key = 128,
1726
.doc = "Debug mode", .group = 3 },
1727
{ .name = "connect", .key = 'c',
1728
.arg = "ADDRESS:PORT",
1729
.doc = "Connect directly to a specific Mandos server",
1731
{ .name = "interface", .key = 'i',
1733
.doc = "Network interface that will be used to search for"
1736
{ .name = "seckey", .key = 's',
1738
.doc = "OpenPGP secret key file base name",
1740
{ .name = "pubkey", .key = 'p',
1742
.doc = "OpenPGP public key file base name",
1744
{ .name = "dh-bits", .key = 129,
1746
.doc = "Bit length of the prime number used in the"
1747
" Diffie-Hellman key exchange",
1749
{ .name = "priority", .key = 130,
1751
.doc = "GnuTLS priority string for the TLS handshake",
1753
{ .name = "delay", .key = 131,
1755
.doc = "Maximum delay to wait for interface startup",
1757
{ .name = "retry", .key = 132,
1759
.doc = "Retry interval used when denied by the Mandos server",
1761
{ .name = "network-hook-dir", .key = 133,
1763
.doc = "Directory where network hooks are located",
1766
* These reproduce what we would get without ARGP_NO_HELP
1768
{ .name = "help", .key = '?',
1769
.doc = "Give this help list", .group = -1 },
1770
{ .name = "usage", .key = -3,
1771
.doc = "Give a short usage message", .group = -1 },
1772
{ .name = "version", .key = 'V',
1773
.doc = "Print program version", .group = -1 },
1777
error_t parse_opt(int key, char *arg,
1778
struct argp_state *state){
1781
case 128: /* --debug */
1784
case 'c': /* --connect */
1787
case 'i': /* --interface */
1790
case 's': /* --seckey */
1793
case 'p': /* --pubkey */
1796
case 129: /* --dh-bits */
1798
tmpmax = strtoimax(arg, &tmp, 10);
1799
if(errno != 0 or tmp == arg or *tmp != '\0'
1800
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1801
argp_error(state, "Bad number of DH bits");
1803
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1805
case 130: /* --priority */
1808
case 131: /* --delay */
1810
delay = strtof(arg, &tmp);
1811
if(errno != 0 or tmp == arg or *tmp != '\0'){
1812
argp_error(state, "Bad delay");
1814
case 132: /* --retry */
1816
retry_interval = strtod(arg, &tmp);
1817
if(errno != 0 or tmp == arg or *tmp != '\0'
1818
or (retry_interval * 1000) > INT_MAX
1819
or retry_interval < 0){
1820
argp_error(state, "Bad retry interval");
1823
case 133: /* --network-hook-dir */
1827
* These reproduce what we would get without ARGP_NO_HELP
1829
case '?': /* --help */
1830
argp_state_help(state, state->out_stream,
1831
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1832
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1833
case -3: /* --usage */
1834
argp_state_help(state, state->out_stream,
1835
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1836
case 'V': /* --version */
1837
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1838
exit(argp_err_exit_status);
1841
return ARGP_ERR_UNKNOWN;
1846
struct argp argp = { .options = options, .parser = parse_opt,
1848
.doc = "Mandos client -- Get and decrypt"
1849
" passwords from a Mandos server" };
1850
ret = argp_parse(&argp, argc, argv,
1851
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1858
perror_plus("argp_parse");
1859
exitcode = EX_OSERR;
1862
exitcode = EX_USAGE;
1868
/* Work around Debian bug #633582:
1869
<http://bugs.debian.org/633582> */
1871
/* Re-raise priviliges */
1872
if(raise_privileges() == 0){
1875
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1876
int seckey_fd = open(seckey, O_RDONLY);
1877
if(seckey_fd == -1){
1878
perror_plus("open");
1880
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1882
perror_plus("fstat");
1884
if(S_ISREG(st.st_mode)
1885
and st.st_uid == 0 and st.st_gid == 0){
1886
ret = fchown(seckey_fd, uid, gid);
1888
perror_plus("fchown");
1892
TEMP_FAILURE_RETRY(close(seckey_fd));
1896
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1897
int pubkey_fd = open(pubkey, O_RDONLY);
1898
if(pubkey_fd == -1){
1899
perror_plus("open");
1901
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1903
perror_plus("fstat");
1905
if(S_ISREG(st.st_mode)
1906
and st.st_uid == 0 and st.st_gid == 0){
1907
ret = fchown(pubkey_fd, uid, gid);
1909
perror_plus("fchown");
1913
TEMP_FAILURE_RETRY(close(pubkey_fd));
1917
/* Lower privileges */
1921
perror_plus("seteuid");
1926
/* Run network hooks */
1927
if(not run_network_hooks("start", interface, delay)){
1932
avahi_set_log_function(empty_log);
1935
if(interface[0] == '\0'){
1936
struct dirent **direntries;
1937
/* First look for interfaces that are up */
1938
ret = scandir(sys_class_net, &direntries, up_interface,
1941
/* No up interfaces, look for any good interfaces */
1943
ret = scandir(sys_class_net, &direntries, good_interface,
1947
/* Pick the first interface returned */
1948
interface = strdup(direntries[0]->d_name);
1950
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1952
if(interface == NULL){
1953
perror_plus("malloc");
1955
exitcode = EXIT_FAILURE;
1961
fprintf_plus(stderr, "Could not find a network interface\n");
1962
exitcode = EXIT_FAILURE;
1967
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1968
from the signal handler */
1969
/* Initialize the pseudo-RNG for Avahi */
1970
srand((unsigned int) time(NULL));
1971
mc.simple_poll = avahi_simple_poll_new();
1972
if(mc.simple_poll == NULL){
1973
fprintf_plus(stderr,
1974
"Avahi: Failed to create simple poll object.\n");
1975
exitcode = EX_UNAVAILABLE;
1979
sigemptyset(&sigterm_action.sa_mask);
1980
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1982
perror_plus("sigaddset");
1983
exitcode = EX_OSERR;
1986
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1988
perror_plus("sigaddset");
1989
exitcode = EX_OSERR;
1992
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1994
perror_plus("sigaddset");
1995
exitcode = EX_OSERR;
1998
/* Need to check if the handler is SIG_IGN before handling:
1999
| [[info:libc:Initial Signal Actions]] |
2000
| [[info:libc:Basic Signal Handling]] |
2002
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2004
perror_plus("sigaction");
2007
if(old_sigterm_action.sa_handler != SIG_IGN){
2008
ret = sigaction(SIGINT, &sigterm_action, NULL);
2010
perror_plus("sigaction");
2011
exitcode = EX_OSERR;
2015
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2017
perror_plus("sigaction");
2020
if(old_sigterm_action.sa_handler != SIG_IGN){
2021
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2023
perror_plus("sigaction");
2024
exitcode = EX_OSERR;
2028
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2030
perror_plus("sigaction");
2033
if(old_sigterm_action.sa_handler != SIG_IGN){
2034
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2036
perror_plus("sigaction");
2037
exitcode = EX_OSERR;
2042
/* If the interface is down, bring it up */
2043
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2044
ret = bring_up_interface(interface, delay);
2047
perror_plus("Failed to bring up interface");
2055
ret = init_gnutls_global(pubkey, seckey);
2057
fprintf_plus(stderr, "init_gnutls_global failed\n");
2058
exitcode = EX_UNAVAILABLE;
2061
gnutls_initialized = true;
2068
if(mkdtemp(tempdir) == NULL){
2069
perror_plus("mkdtemp");
2072
tempdir_created = true;
2078
if(not init_gpgme(pubkey, seckey, tempdir)){
2079
fprintf_plus(stderr, "init_gpgme failed\n");
2080
exitcode = EX_UNAVAILABLE;
2083
gpgme_initialized = true;
2090
if(connect_to != NULL){
2091
/* Connect directly, do not use Zeroconf */
2092
/* (Mainly meant for debugging) */
2093
char *address = strrchr(connect_to, ':');
2095
if(address == NULL){
2096
fprintf_plus(stderr, "No colon in address\n");
2097
exitcode = EX_USAGE;
2107
tmpmax = strtoimax(address+1, &tmp, 10);
2108
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2109
or tmpmax != (uint16_t)tmpmax){
2110
fprintf_plus(stderr, "Bad port number\n");
2111
exitcode = EX_USAGE;
2119
port = (uint16_t)tmpmax;
2121
/* Colon in address indicates IPv6 */
2123
if(strchr(connect_to, ':') != NULL){
2125
/* Accept [] around IPv6 address - see RFC 5952 */
2126
if(connect_to[0] == '[' and address[-1] == ']')
2134
address = connect_to;
2140
while(not quit_now){
2141
ret = start_mandos_communication(address, port, if_index, af);
2142
if(quit_now or ret == 0){
2146
fprintf_plus(stderr, "Retrying in %d seconds\n",
2147
(int)retry_interval);
2149
sleep((int)retry_interval);
2153
exitcode = EXIT_SUCCESS;
2164
AvahiServerConfig config;
2165
/* Do not publish any local Zeroconf records */
2166
avahi_server_config_init(&config);
2167
config.publish_hinfo = 0;
2168
config.publish_addresses = 0;
2169
config.publish_workstation = 0;
2170
config.publish_domain = 0;
2172
/* Allocate a new server */
2173
mc.server = avahi_server_new(avahi_simple_poll_get
2174
(mc.simple_poll), &config, NULL,
2177
/* Free the Avahi configuration data */
2178
avahi_server_config_free(&config);
2181
/* Check if creating the Avahi server object succeeded */
2182
if(mc.server == NULL){
2183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2184
avahi_strerror(error));
2185
exitcode = EX_UNAVAILABLE;
2193
/* Create the Avahi service browser */
2194
sb = avahi_s_service_browser_new(mc.server, if_index,
2195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2196
NULL, 0, browse_callback, NULL);
2198
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2199
avahi_strerror(avahi_server_errno(mc.server)));
2200
exitcode = EX_UNAVAILABLE;
2208
/* Run the main loop */
2211
fprintf_plus(stderr, "Starting Avahi loop search\n");
2214
ret = avahi_loop_with_timeout(mc.simple_poll,
2215
(int)(retry_interval * 1000));
2217
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2218
(ret == 0) ? "successfully" : "with error");
2224
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2227
/* Cleanup things */
2229
avahi_s_service_browser_free(sb);
2231
if(mc.server != NULL)
2232
avahi_server_free(mc.server);
2234
if(mc.simple_poll != NULL)
2235
avahi_simple_poll_free(mc.simple_poll);
2237
if(gnutls_initialized){
2238
gnutls_certificate_free_credentials(mc.cred);
2239
gnutls_global_deinit();
2240
gnutls_dh_params_deinit(mc.dh_params);
2243
if(gpgme_initialized){
2244
gpgme_release(mc.ctx);
2247
/* Cleans up the circular linked list of Mandos servers the client
2249
if(mc.current_server != NULL){
2250
mc.current_server->prev->next = NULL;
2251
while(mc.current_server != NULL){
2252
server *next = mc.current_server->next;
2253
free(mc.current_server);
2254
mc.current_server = next;
2258
/* Run network hooks */
2259
run_network_hooks("stop", interface, delay);
2261
/* Re-raise priviliges */
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
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");
868
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);
2267
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
2272
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2279
perror_plus("close");
2283
/* Lower privileges permanently */
2287
perror_plus("setuid");
2290
/* Removes the GPGME temp directory and all files inside */
2291
if(tempdir_created){
2292
struct dirent **direntries = NULL;
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2296
if (numentries > 0){
2297
for(int i = 0; i < numentries; i++){
2298
direntry = direntries[i];
2299
char *fullname = NULL;
2300
ret = asprintf(&fullname, "%s/%s", tempdir,
2303
perror_plus("asprintf");
2306
ret = remove(fullname);
2308
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2315
/* need to clean even if 0 because man page doesn't specify */
2317
if (numentries == -1){
2318
perror_plus("scandir");
2320
ret = rmdir(tempdir);
2321
if(ret == -1 and errno != ENOENT){
2322
perror_plus("rmdir");
2327
sigemptyset(&old_sigterm_action.sa_mask);
2328
old_sigterm_action.sa_handler = SIG_DFL;
2329
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2330
&old_sigterm_action,
2333
perror_plus("sigaction");
2336
ret = raise(signal_received);
2337
} while(ret != 0 and errno == EINTR);
2339
perror_plus("raise");
2342
TEMP_FAILURE_RETRY(pause());
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
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);
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 ();