199
131
return buffer_capacity;
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
211
*new_server = (server){ .ip = strdup(ip),
213
.if_index = if_index,
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
perror_plus("clock_gettime");
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
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;
244
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
245
148
gpgme_engine_info_t engine_info;
249
* Helper function to insert pub and seckey to the engine keyring.
251
bool import_key(const char *filename){
254
gpgme_data_t pgp_data;
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
270
rc = gpgme_op_import(mc.ctx, pgp_data);
271
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
gpgme_data_release(pgp_data);
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
292
155
gpgme_check_version(NULL);
293
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
159
gpgme_strsource(rc), gpgme_strerror(rc));
301
163
/* Set GPGME home directory for the OpenPGP engine only */
302
rc = gpgme_get_engine_info(&engine_info);
303
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
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",
306
167
gpgme_strsource(rc), gpgme_strerror(rc));
309
170
while(engine_info != NULL){
310
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
311
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
312
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
315
176
engine_info = engine_info->next;
317
178
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
332
if(not import_key(pubkey) or not import_key(seckey)){
340
* Decrypt OpenPGP data.
341
* Returns -1 on error
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
gpgme_data_t dh_crypto, dh_plain;
349
size_t plaintext_capacity = 0;
350
ssize_t plaintext_length = 0;
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
357
183
/* Create new GPGME data buffer from memory cryptotext */
358
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
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(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
372
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(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
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",
383
215
gpgme_strsource(rc), gpgme_strerror(rc));
384
216
plaintext_length = -1;
386
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
398
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
402
gpgme_recipient_t recipient;
403
recipient = result->recipients;
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
404
240
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
241
fprintf(stderr, "Public key algorithm: %s\n",
407
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
412
245
recipient->status == GPG_ERR_NO_SECKEY
414
247
recipient = recipient->next;
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
426
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
427
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
428
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
429
256
plaintext_length = -1;
430
257
goto decrypt_end;
433
260
*plaintext = NULL;
435
plaintext_capacity = incbuffer(plaintext,
436
(size_t)plaintext_length,
438
if(plaintext_capacity == 0){
439
perror_plus("incbuffer");
440
plaintext_length = -1;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
444
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
446
273
/* Print the data, if any */
452
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
453
280
plaintext_length = -1;
454
281
goto decrypt_end;
456
283
plaintext_length += ret;
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
462
288
for(ssize_t i = 0; i < plaintext_length; i++){
463
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
635
438
/* Called when a Mandos server is found */
636
439
static int start_mandos_communication(const char *ip, uint16_t port,
637
440
AvahiIfIndex if_index,
639
int ret, tcp_sd = -1;
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
645
444
char *buffer = NULL;
646
char *decrypted_buffer = NULL;
445
char *decrypted_buffer;
647
446
size_t buffer_length = 0;
648
447
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
451
char interface[IF_NAMESIZE];
651
452
gnutls_session_t session;
652
int pf; /* Protocol family */
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
675
ret = init_gnutls_session(&session);
454
ret = init_gnutls_session (mc, &session);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
689
perror_plus("socket");
699
memset(&to, 0, sizeof(to));
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
709
perror_plus("inet_pton");
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
475
fprintf(stderr, "Binding to interface %s\n", interface);
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
723
-Wunreachable-code */
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
728
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
735
/* Set the network interface number as scope */
736
to.in6.sin6_scope_id = (uint32_t)if_index;
739
to.in.sin_port = htons(port); /* Spurious warnings from
741
-Wunreachable-code */
488
fprintf(stderr, "Bad address: %s\n", ip);
491
to.in6.sin6_port = htons(port); /* Spurious warning */
493
to.in6.sin6_scope_id = (uint32_t)if_index;
750
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
char interface[IF_NAMESIZE];
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
774
perror_plus("inet_ntop");
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
776
503
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
796
perror_plus("connect");
509
ret = connect(tcp_sd, &to.in, sizeof(to));
807
515
const char *out = mandos_protocol_version;
810
518
size_t out_size = strlen(out);
811
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
812
out_size - written));
815
perror_plus("write");
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
819
526
written += (size_t)ret;
820
527
if(written < out_size){
823
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
856
ret = gnutls_handshake(session);
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
546
ret = gnutls_handshake (session);
861
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
863
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
873
558
/* Read OpenPGP packet that contains the wanted password */
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
887
buffer_capacity = incbuffer(&buffer, buffer_length,
889
if(buffer_capacity == 0){
891
perror_plus("incbuffer");
901
sret = gnutls_record_recv(session, buffer+buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
574
ret = gnutls_record_recv(session, buffer+buffer_length,
908
581
case GNUTLS_E_INTERRUPTED:
909
582
case GNUTLS_E_AGAIN:
911
584
case GNUTLS_E_REHANDSHAKE:
913
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
919
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
596
fprintf(stderr, "Unknown error while reading data from"
931
597
" encrypted session with Mandos server\n");
932
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
937
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
952
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
957
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
959
if(buffer_length > 0){
960
ssize_t decrypted_buffer_size;
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
963
if(decrypted_buffer_size >= 0){
608
fprintf(stderr, "Closing TLS session\n");
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
618
if (decrypted_buffer_size >= 0){
966
620
while(written < (size_t) decrypted_buffer_size){
972
ret = (int)fwrite(decrypted_buffer + written, 1,
973
(size_t)decrypted_buffer_size - written,
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
975
624
if(ret == 0 and ferror(stdout)){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
626
fprintf(stderr, "Error writing encrypted data: %s\n",
980
627
strerror(errno));
985
632
written += (size_t)ret;
634
free(decrypted_buffer);
991
640
/* Shutdown procedure */
996
free(decrypted_buffer);
999
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1005
perror_plus("close");
1007
gnutls_deinit(session);
645
gnutls_deinit (session);
1017
649
static void resolve_callback(AvahiSServiceResolver *r,
1018
650
AvahiIfIndex interface,
1019
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1020
652
AvahiResolverEvent event,
1021
653
const char *name,
1022
654
const char *type,
1118
737
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
738
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
740
fprintf(stderr, "No Mandos server found, still searching...\n");
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
1134
signal_received = sig;
1135
int old_errno = errno;
1136
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1148
perror_plus("socket");
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1155
perror_plus("ioctl SIOCGIFFLAGS");
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1197
/* Accept this device */
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1216
if(not get_flags(if_entry->d_name, &ifr)){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1225
if(not good_flags(if_entry->d_name, &ifr)){
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1242
if(not get_flags(if_entry->d_name, &ifr)){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1271
if(not good_flags(if_entry->d_name, &ifr)){
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1294
if((direntry->d_name)[0] == '\0'){
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
750
int ret = asprintf(&tmp, "%s/%s", first, second);
1316
perror_plus("asprintf");
1320
ret = stat(fullname, &st);
1323
perror_plus("Could not stat hook");
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1355
if(mc.current_server == NULL){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1360
ret = avahi_simple_poll_iterate(s, -1);
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1370
perror_plus("clock_gettime");
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1397
avahi_simple_poll_quit(mc.simple_poll);
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1403
perror_plus("clock_gettime");
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1421
758
int main(int argc, char *argv[]){
1422
AvahiSServiceBrowser *sb = NULL;
1427
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1429
struct ifreq network;
1431
bool take_down_interface = false;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
const char *seckey = PATHDIR "/" SECKEY;
1438
const char *pubkey = PATHDIR "/" PUBKEY;
1440
bool gnutls_initialized = false;
1441
bool gpgme_initialized = false;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1447
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1452
/* Lower any group privileges we might have, just to be safe */
1456
perror_plus("setgid");
1459
/* Lower user privileges (temporarily) */
1463
perror_plus("seteuid");
1471
struct argp_option options[] = {
1472
{ .name = "debug", .key = 128,
1473
.doc = "Debug mode", .group = 3 },
1474
{ .name = "connect", .key = 'c',
1475
.arg = "ADDRESS:PORT",
1476
.doc = "Connect directly to a specific Mandos server",
1478
{ .name = "interface", .key = 'i',
1480
.doc = "Network interface that will be used to search for"
1483
{ .name = "seckey", .key = 's',
1485
.doc = "OpenPGP secret key file base name",
1487
{ .name = "pubkey", .key = 'p',
1489
.doc = "OpenPGP public key file base name",
1491
{ .name = "dh-bits", .key = 129,
1493
.doc = "Bit length of the prime number used in the"
1494
" Diffie-Hellman key exchange",
1496
{ .name = "priority", .key = 130,
1498
.doc = "GnuTLS priority string for the TLS handshake",
1500
{ .name = "delay", .key = 131,
1502
.doc = "Maximum delay to wait for interface startup",
1504
{ .name = "retry", .key = 132,
1506
.doc = "Retry interval used when denied by the mandos server",
1508
{ .name = "network-hook-dir", .key = 133,
1510
.doc = "Directory where network hooks are located",
1513
* These reproduce what we would get without ARGP_NO_HELP
1515
{ .name = "help", .key = '?',
1516
.doc = "Give this help list", .group = -1 },
1517
{ .name = "usage", .key = -3,
1518
.doc = "Give a short usage message", .group = -1 },
1519
{ .name = "version", .key = 'V',
1520
.doc = "Print program version", .group = -1 },
1524
error_t parse_opt(int key, char *arg,
1525
struct argp_state *state){
1528
case 128: /* --debug */
1531
case 'c': /* --connect */
1534
case 'i': /* --interface */
1537
case 's': /* --seckey */
1540
case 'p': /* --pubkey */
1543
case 129: /* --dh-bits */
1545
tmpmax = strtoimax(arg, &tmp, 10);
1546
if(errno != 0 or tmp == arg or *tmp != '\0'
1547
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1548
argp_error(state, "Bad number of DH bits");
1550
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1552
case 130: /* --priority */
1555
case 131: /* --delay */
1557
delay = strtof(arg, &tmp);
1558
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1561
case 132: /* --retry */
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1570
case 133: /* --network-hook-dir */
1574
* These reproduce what we would get without ARGP_NO_HELP
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
1589
return ARGP_ERR_UNKNOWN;
1594
struct argp argp = { .options = options, .parser = parse_opt,
1596
.doc = "Mandos client -- Get and decrypt"
1597
" passwords from a Mandos server" };
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1610
exitcode = EX_USAGE;
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1620
/* Re-raise priviliges */
1624
perror_plus("seteuid");
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1634
perror_plus("fstat");
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1639
perror_plus("fchown");
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1654
perror_plus("fstat");
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1659
perror_plus("fchown");
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
/* Find network hooks and run them */
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1682
perror_plus("scandir");
759
AvahiSServiceBrowser *sb = NULL;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
784
.doc = "Connect directly to a sepcified mandos server",
786
{ .name = "interface", .key = 'i',
788
.doc = "Interface that Avahi will conntect through",
790
{ .name = "keydir", .key = 'd',
792
.doc = "Directory where the openpgp keyring is",
794
{ .name = "seckey", .key = 's',
796
.doc = "Secret openpgp key for gnutls authentication",
798
{ .name = "pubkey", .key = 'p',
800
.doc = "Public openpgp key for gnutls authentication",
802
{ .name = "dh-bits", .key = 129,
804
.doc = "dh-bits to use in gnutls communication",
806
{ .name = "priority", .key = 130,
808
.doc = "GNUTLS priority", .group = 1 },
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
852
return ARGP_ERR_UNKNOWN;
857
struct argp argp = { .options = options, .parser = parse_opt,
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1690
perror_plus("asprintf");
1693
pid_t hook_pid = fork();
1696
dup2(devnull, STDIN_FILENO);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1701
perror_plus("setenv");
1704
ret = setenv("DEVICE", interface, 1);
1706
perror_plus("setenv");
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1711
perror_plus("setenv");
1714
ret = setenv("MODE", "start", 1);
1716
perror_plus("setenv");
1720
ret = asprintf(&delaystring, "%f", delay);
1722
perror_plus("asprintf");
1725
ret = setenv("DELAY", delaystring, 1);
1728
perror_plus("setenv");
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
889
gnutls_initalized = true;
892
/* If the interface is down, bring it up */
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
exitcode = EXIT_FAILURE;
900
strcpy(network.ifr_name, interface); /* Spurious warning */
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1849
perror_plus("sigaction");
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1862
perror_plus("sigaction");
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1875
perror_plus("sigaction");
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
933
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1901
/* Re-raise priviliges */
1905
perror_plus("seteuid");
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1917
#endif /* __linux__ */
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1927
perror_plus("klogctl");
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1935
perror_plus("seteuid");
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
perror_plus("ioctl SIOCGIFFLAGS");
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1947
perror_plus("klogctl");
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1956
perror_plus("seteuid");
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1972
perror_plus("klogctl");
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1980
perror_plus("seteuid");
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
perror_plus("close");
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2012
perror_plus("klogctl");
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2018
if(take_down_interface){
2019
/* Lower privileges */
2022
perror_plus("seteuid");
2025
/* Lower privileges permanently */
2028
perror_plus("setuid");
2037
ret = init_gnutls_global(pubkey, seckey);
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
2044
gnutls_initialized = true;
2051
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
2055
tempdir_created = true;
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
2067
gpgme_initialized = true;
2074
if(connect_to != NULL){
2075
/* Connect directly, do not use Zeroconf */
2076
/* (Mainly meant for debugging) */
2077
char *address = strrchr(connect_to, ':');
2078
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2081
exitcode = EX_USAGE;
2091
tmpmax = strtoimax(address+1, &tmp, 10);
2092
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2096
exitcode = EX_USAGE;
2104
port = (uint16_t)tmpmax;
2106
/* Colon in address indicates IPv6 */
2108
if(strchr(connect_to, ':') != NULL){
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2119
address = connect_to;
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2134
sleep((int)retry_interval);
2138
exitcode = EXIT_SUCCESS;
2149
AvahiServerConfig config;
2150
/* Do not publish any local Zeroconf records */
2151
avahi_server_config_init(&config);
2152
config.publish_hinfo = 0;
2153
config.publish_addresses = 0;
2154
config.publish_workstation = 0;
2155
config.publish_domain = 0;
2157
/* Allocate a new server */
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2162
/* Free the Avahi configuration data */
2163
avahi_server_config_free(&config);
2166
/* Check if creating the Avahi server object succeeded */
2167
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
2179
/* Create the Avahi service browser */
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2187
exitcode = EX_UNAVAILABLE;
2195
/* Run the main loop */
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
958
exitcode = EXIT_FAILURE;
960
exitcode = EXIT_SUCCESS;
966
avahi_set_log_function(empty_log);
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
977
exitcode = EXIT_FAILURE;
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1019
/* Run the main loop */
1022
fprintf(stderr, "Starting Avahi loop search\n");
1025
avahi_simple_poll_loop(mc.simple_poll);
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2217
/* Cleanup things */
2219
avahi_s_service_browser_free(sb);
2221
if(mc.server != NULL)
2222
avahi_server_free(mc.server);
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2227
if(gnutls_initialized){
2228
gnutls_certificate_free_credentials(mc.cred);
2229
gnutls_global_deinit();
2230
gnutls_dh_params_deinit(mc.dh_params);
2233
if(gpgme_initialized){
2234
gpgme_release(mc.ctx);
2237
/* Cleans up the circular linked list of Mandos servers the client
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2248
/* XXX run network hooks "stop" here */
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2256
perror_plus("seteuid");
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
2282
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2295
perror_plus("asprintf");
2298
ret = remove(fullname);
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2307
/* need to clean even if 0 because man page doesn't specify */
2309
if (numentries == -1){
2310
perror_plus("scandir");
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2325
perror_plus("sigaction");
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2331
perror_plus("raise");
2334
TEMP_FAILURE_RETRY(pause());
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1033
/* Cleanup things */
1035
avahi_s_service_browser_free(sb);
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();