131
206
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
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
144
251
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
252
gpgme_engine_info_t engine_info;
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
155
296
gpgme_check_version(NULL);
156
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
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));
163
304
/* Set GPGME home directory for the OpenPGP engine only */
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));
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));
170
311
while(engine_info != NULL){
171
312
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
313
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
314
engine_info->file_name, tempdir);
176
317
engine_info = engine_info->next;
178
319
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
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");
183
358
/* Create new GPGME data buffer from memory cryptotext */
184
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
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));
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));
192
367
/* Create new empty GPGME data buffer for the plaintext */
193
368
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
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));
197
373
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;
210
377
/* Decrypt data from the cryptotext data buffer to the plaintext
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));
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));
216
383
plaintext_length = -1;
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;
385
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
388
fprintf_plus(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);
394
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
gpgme_recipient_t recipient;
398
recipient = result->recipients;
240
399
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
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
247
407
recipient = recipient->next;
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
253
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
256
421
plaintext_length = -1;
257
422
goto decrypt_end;
260
425
*plaintext = NULL;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
430
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
271
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
273
438
/* Print the data, if any */
279
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
280
445
plaintext_length = -1;
281
446
goto decrypt_end;
283
448
plaintext_length += ret;
287
fprintf(stderr, "Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
288
453
for(ssize_t i = 0; i < plaintext_length; i++){
289
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
437
621
/* Called when a Mandos server is found */
438
622
static int start_mandos_communication(const char *ip, uint16_t port,
439
623
AvahiIfIndex if_index,
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
625
int ret, tcp_sd = -1;
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
443
631
char *buffer = NULL;
444
char *decrypted_buffer;
632
char *decrypted_buffer = NULL;
445
633
size_t buffer_length = 0;
446
634
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
450
char interface[IF_NAMESIZE];
451
637
gnutls_session_t session;
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);
477
memset(&to,0,sizeof(to)); /* Spurious warning */
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);
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");
683
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");
487
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
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 */
492
to.in6.sin6_scope_id = (uint32_t)if_index;
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){
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");
502
757
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
508
ret = connect(tcp_sd, &to.in, sizeof(to));
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");
514
787
const char *out = mandos_protocol_version;
517
790
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
795
perror_plus("write");
525
799
written += (size_t)ret;
526
800
if(written < out_size){
529
if (out == mandos_protocol_version){
803
if(out == mandos_protocol_version){
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);
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);
546
843
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
if (ret != GNUTLS_E_SUCCESS){
845
if(ret != GNUTLS_E_SUCCESS){
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
557
854
/* Read OpenPGP packet that contains the wanted password */
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
573
ret = gnutls_record_recv(session, buffer+buffer_length,
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,
580
889
case GNUTLS_E_INTERRUPTED:
581
890
case GNUTLS_E_AGAIN:
583
892
case GNUTLS_E_REHANDSHAKE:
585
ret = gnutls_handshake (session);
894
ret = gnutls_handshake(session);
586
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
602
buffer_length += (size_t) ret;
917
buffer_length += (size_t) sret;
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){
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){
619
945
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
951
ret = (int)fwrite(decrypted_buffer + written, 1,
952
(size_t)decrypted_buffer_size - written,
623
954
if(ret == 0 and ferror(stdout)){
625
fprintf(stderr, "Error writing encrypted data: %s\n",
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
631
963
written += (size_t)ret;
633
free(decrypted_buffer);
639
969
/* Shutdown procedure */
644
gnutls_deinit (session);
974
free(decrypted_buffer);
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
983
perror_plus("close");
985
gnutls_deinit(session);
648
995
static void resolve_callback(AvahiSServiceResolver *r,
649
996
AvahiIfIndex interface,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
651
998
AvahiResolverEvent event,
652
999
const char *name,
653
1000
const char *type,
736
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
737
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
739
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
755
memcpy(tmp, first, f_len); /* Spurious warning */
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
761
tmp[f_len + 1 + s_len] = '\0';
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);
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
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1415
if(setuid(0) == -1){
1417
perror_plus("seteuid");
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1429
perror_plus("seteuid");
1435
bool run_network_hooks(const char *mode, const char *interface,
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1443
perror_plus("scandir");
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1451
perror_plus("asprintf");
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1458
pid_t hook_pid = fork();
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1467
perror_plus("setgid");
1469
/* Reset supplementary groups */
1471
ret = setgroups(0, NULL);
1473
perror_plus("setgroups");
1475
dup2(devnull, STDIN_FILENO);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1480
perror_plus("setenv");
1483
ret = setenv("DEVICE", interface, 1);
1485
perror_plus("setenv");
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1490
perror_plus("setenv");
1493
ret = setenv("MODE", mode, 1);
1495
perror_plus("setenv");
1499
ret = asprintf(&delaystring, "%f", delay);
1501
perror_plus("asprintf");
1504
ret = setenv("DELAY", delaystring, 1);
1507
perror_plus("setenv");
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1514
perror_plus("setenv");
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1561
int bring_up_interface(const char *const interface,
1564
int old_errno = errno;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1580
/* Re-raise priviliges */
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1592
#endif /* __linux__ */
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
perror_plus("socket");
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1602
perror_plus("klogctl");
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
perror_plus("ioctl SIOCGIFFLAGS");
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1620
perror_plus("klogctl");
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1639
perror_plus("klogctl");
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1649
/* Sleep checking until interface is running.
1650
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1659
ret = nanosleep(&sleeptime, NULL);
1660
if(ret == -1 and errno != EINTR){
1661
perror_plus("nanosleep");
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1667
perror_plus("close");
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1674
perror_plus("klogctl");
1677
#endif /* __linux__ */
1678
/* Lower privileges */
766
1684
int main(int argc, char *argv[]){
767
AvahiSServiceBrowser *sb = NULL;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
790
.doc = "Connect directly to a sepcified mandos server",
792
{ .name = "interface", .key = 'i',
794
.doc = "Interface that Avahi will conntect through",
796
{ .name = "keydir", .key = 'd',
798
.doc = "Directory where the openpgp keyring is",
800
{ .name = "seckey", .key = 's',
802
.doc = "Secret openpgp key for gnutls authentication",
804
{ .name = "pubkey", .key = 'p',
806
.doc = "Public openpgp key for gnutls authentication",
808
{ .name = "dh-bits", .key = 129,
810
.doc = "dh-bits to use in gnutls communication",
812
{ .name = "priority", .key = 130,
814
.doc = "GNUTLS priority", .group = 1 },
1685
AvahiSServiceBrowser *sb = NULL;
1690
int exitcode = EXIT_SUCCESS;
1691
const char *interface = "";
1692
struct ifreq network;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1698
const char *seckey = PATHDIR "/" SECKEY;
1699
const char *pubkey = PATHDIR "/" PUBKEY;
1701
bool gnutls_initialized = false;
1702
bool gpgme_initialized = false;
1704
double retry_interval = 10; /* 10s between trying a server and
1705
retrying the same server again */
1707
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1708
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1713
/* Lower any group privileges we might have, just to be safe */
1717
perror_plus("setgid");
1720
/* Lower user privileges (temporarily) */
1724
perror_plus("seteuid");
1732
struct argp_option options[] = {
1733
{ .name = "debug", .key = 128,
1734
.doc = "Debug mode", .group = 3 },
1735
{ .name = "connect", .key = 'c',
1736
.arg = "ADDRESS:PORT",
1737
.doc = "Connect directly to a specific Mandos server",
1739
{ .name = "interface", .key = 'i',
1741
.doc = "Network interface that will be used to search for"
1744
{ .name = "seckey", .key = 's',
1746
.doc = "OpenPGP secret key file base name",
1748
{ .name = "pubkey", .key = 'p',
1750
.doc = "OpenPGP public key file base name",
1752
{ .name = "dh-bits", .key = 129,
1754
.doc = "Bit length of the prime number used in the"
1755
" Diffie-Hellman key exchange",
1757
{ .name = "priority", .key = 130,
1759
.doc = "GnuTLS priority string for the TLS handshake",
1761
{ .name = "delay", .key = 131,
1763
.doc = "Maximum delay to wait for interface startup",
1765
{ .name = "retry", .key = 132,
1767
.doc = "Retry interval used when denied by the Mandos server",
1769
{ .name = "network-hook-dir", .key = 133,
1771
.doc = "Directory where network hooks are located",
1774
* These reproduce what we would get without ARGP_NO_HELP
1776
{ .name = "help", .key = '?',
1777
.doc = "Give this help list", .group = -1 },
1778
{ .name = "usage", .key = -3,
1779
.doc = "Give a short usage message", .group = -1 },
1780
{ .name = "version", .key = 'V',
1781
.doc = "Print program version", .group = -1 },
1785
error_t parse_opt(int key, char *arg,
1786
struct argp_state *state){
1789
case 128: /* --debug */
1792
case 'c': /* --connect */
1795
case 'i': /* --interface */
1798
case 's': /* --seckey */
1801
case 'p': /* --pubkey */
1804
case 129: /* --dh-bits */
1806
tmpmax = strtoimax(arg, &tmp, 10);
1807
if(errno != 0 or tmp == arg or *tmp != '\0'
1808
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1809
argp_error(state, "Bad number of DH bits");
1811
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1813
case 130: /* --priority */
1816
case 131: /* --delay */
1818
delay = strtof(arg, &tmp);
1819
if(errno != 0 or tmp == arg or *tmp != '\0'){
1820
argp_error(state, "Bad delay");
1822
case 132: /* --retry */
1824
retry_interval = strtod(arg, &tmp);
1825
if(errno != 0 or tmp == arg or *tmp != '\0'
1826
or (retry_interval * 1000) > INT_MAX
1827
or retry_interval < 0){
1828
argp_error(state, "Bad retry interval");
1831
case 133: /* --network-hook-dir */
1835
* These reproduce what we would get without ARGP_NO_HELP
1837
case '?': /* --help */
1838
argp_state_help(state, state->out_stream,
1839
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1840
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1841
case -3: /* --usage */
1842
argp_state_help(state, state->out_stream,
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1844
case 'V': /* --version */
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1846
exit(argp_err_exit_status);
1849
return ARGP_ERR_UNKNOWN;
1854
struct argp argp = { .options = options, .parser = parse_opt,
1856
.doc = "Mandos client -- Get and decrypt"
1857
" passwords from a Mandos server" };
1858
ret = argp_parse(&argp, argc, argv,
1859
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1866
perror_plus("argp_parse");
1867
exitcode = EX_OSERR;
1870
exitcode = EX_USAGE;
1876
/* Work around Debian bug #633582:
1877
<http://bugs.debian.org/633582> */
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
859
return ARGP_ERR_UNKNOWN;
864
struct argp argp = { .options = options, .parser = parse_opt,
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1884
int seckey_fd = open(seckey, O_RDONLY);
1885
if(seckey_fd == -1){
1886
perror_plus("open");
1888
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1890
perror_plus("fstat");
1892
if(S_ISREG(st.st_mode)
1893
and st.st_uid == 0 and st.st_gid == 0){
1894
ret = fchown(seckey_fd, uid, gid);
1896
perror_plus("fchown");
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
int pubkey_fd = open(pubkey, O_RDONLY);
1906
if(pubkey_fd == -1){
1907
perror_plus("open");
1909
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1911
perror_plus("fstat");
1913
if(S_ISREG(st.st_mode)
1914
and st.st_uid == 0 and st.st_gid == 0){
1915
ret = fchown(pubkey_fd, uid, gid);
1917
perror_plus("fchown");
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1925
/* Lower privileges */
1929
perror_plus("seteuid");
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1940
avahi_set_log_function(empty_log);
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1949
/* No up interfaces, look for any good interfaces */
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1960
if(interface == NULL){
1961
perror_plus("malloc");
871
1963
exitcode = EXIT_FAILURE;
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
1969
fprintf_plus(stderr, "Could not find a network interface\n");
879
1970
exitcode = EXIT_FAILURE;
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
891
fprintf(stderr, "init_gnutls_global\n");
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1976
from the signal handler */
1977
/* Initialize the pseudo-RNG for Avahi */
1978
srand((unsigned int) time(NULL));
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1983
exitcode = EX_UNAVAILABLE;
1987
sigemptyset(&sigterm_action.sa_mask);
1988
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1990
perror_plus("sigaddset");
1991
exitcode = EX_OSERR;
1994
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1996
perror_plus("sigaddset");
1997
exitcode = EX_OSERR;
2000
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2002
perror_plus("sigaddset");
2003
exitcode = EX_OSERR;
2006
/* Need to check if the handler is SIG_IGN before handling:
2007
| [[info:libc:Initial Signal Actions]] |
2008
| [[info:libc:Basic Signal Handling]] |
2010
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2012
perror_plus("sigaction");
2015
if(old_sigterm_action.sa_handler != SIG_IGN){
2016
ret = sigaction(SIGINT, &sigterm_action, NULL);
2018
perror_plus("sigaction");
2019
exitcode = EX_OSERR;
2023
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2025
perror_plus("sigaction");
2028
if(old_sigterm_action.sa_handler != SIG_IGN){
2029
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2031
perror_plus("sigaction");
2032
exitcode = EX_OSERR;
2036
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2038
perror_plus("sigaction");
2041
if(old_sigterm_action.sa_handler != SIG_IGN){
2042
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2044
perror_plus("sigaction");
2045
exitcode = EX_OSERR;
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2055
perror_plus("Failed to bring up interface");
2063
ret = init_gnutls_global(pubkey, seckey);
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2066
exitcode = EX_UNAVAILABLE;
2069
gnutls_initialized = true;
2076
if(mkdtemp(tempdir) == NULL){
2077
perror_plus("mkdtemp");
2080
tempdir_created = true;
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2088
exitcode = EX_UNAVAILABLE;
2091
gpgme_initialized = true;
2098
if(connect_to != NULL){
2099
/* Connect directly, do not use Zeroconf */
2100
/* (Mainly meant for debugging) */
2101
char *address = strrchr(connect_to, ':');
2103
if(address == NULL){
2104
fprintf_plus(stderr, "No colon in address\n");
2105
exitcode = EX_USAGE;
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2117
or tmpmax != (uint16_t)tmpmax){
2118
fprintf_plus(stderr, "Bad port number\n");
2119
exitcode = EX_USAGE;
2127
port = (uint16_t)tmpmax;
2129
/* Colon in address indicates IPv6 */
2131
if(strchr(connect_to, ':') != NULL){
2133
/* Accept [] around IPv6 address - see RFC 5952 */
2134
if(connect_to[0] == '[' and address[-1] == ']')
894
gnutls_initalized = true;
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
936
exitcode = EXIT_FAILURE;
938
exitcode = EXIT_SUCCESS;
2142
address = connect_to;
943
/* If the interface is down, bring it up */
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
948
exitcode = EXIT_FAILURE;
951
strcpy(network.ifr_name, interface); /* Spurious warning */
2148
while(not quit_now){
2149
ret = start_mandos_communication(address, port, if_index, af);
2150
if(quit_now or ret == 0){
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
(int)retry_interval);
2157
sleep((int)retry_interval);
2161
exitcode = EXIT_SUCCESS;
2172
AvahiServerConfig config;
2173
/* Do not publish any local Zeroconf records */
2174
avahi_server_config_init(&config);
2175
config.publish_hinfo = 0;
2176
config.publish_addresses = 0;
2177
config.publish_workstation = 0;
2178
config.publish_domain = 0;
2180
/* Allocate a new server */
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2185
/* Free the Avahi configuration data */
2186
avahi_server_config_free(&config);
2189
/* Check if creating the Avahi server object succeeded */
2190
if(mc.server == NULL){
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
2193
exitcode = EX_UNAVAILABLE;
2201
/* Create the Avahi service browser */
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2204
NULL, 0, browse_callback, NULL);
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
avahi_strerror(avahi_server_errno(mc.server)));
2208
exitcode = EX_UNAVAILABLE;
2216
/* Run the main loop */
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
(ret == 0) ? "successfully" : "with error");
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2235
/* Cleanup things */
2237
avahi_s_service_browser_free(sb);
2239
if(mc.server != NULL)
2240
avahi_server_free(mc.server);
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2245
if(gnutls_initialized){
2246
gnutls_certificate_free_credentials(mc.cred);
2247
gnutls_global_deinit();
2248
gnutls_dh_params_deinit(mc.dh_params);
2251
if(gpgme_initialized){
2252
gpgme_release(mc.ctx);
2255
/* Cleans up the circular linked list of Mandos servers the client
2257
if(mc.current_server != NULL){
2258
mc.current_server->prev->next = NULL;
2259
while(mc.current_server != NULL){
2260
server *next = mc.current_server->next;
2261
free(mc.current_server);
2262
mc.current_server = next;
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2269
/* Re-raise priviliges */
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
952
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
960
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
971
avahi_set_log_function(empty_log);
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
982
exitcode = EXIT_FAILURE;
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1024
/* Run the main loop */
1027
fprintf(stderr, "Starting Avahi loop search\n");
1030
avahi_simple_poll_loop(mc.simple_poll);
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1038
/* Cleanup things */
1040
avahi_s_service_browser_free(sb);
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
perror_plus("close");
2291
/* Lower privileges permanently */
2295
perror_plus("setuid");
2298
/* Removes the GPGME temp directory and all files inside */
2299
if(tempdir_created){
2300
struct dirent **direntries = NULL;
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
perror_plus("asprintf");
2314
ret = remove(fullname);
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2323
/* need to clean even if 0 because man page doesn't specify */
2325
if (numentries == -1){
2326
perror_plus("scandir");
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2335
sigemptyset(&old_sigterm_action.sa_mask);
2336
old_sigterm_action.sa_handler = SIG_DFL;
2337
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2338
&old_sigterm_action,
2341
perror_plus("sigaction");
2344
ret = raise(signal_received);
2345
} while(ret != 0 and errno == EINTR);
2347
perror_plus("raise");
2350
TEMP_FAILURE_RETRY(pause());