130
204
return buffer_capacity;
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
216
*new_server = (server){ .ip = strdup(ip),
218
.if_index = if_index,
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
238
perror_plus("clock_gettime");
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
143
249
gpgme_error_t rc;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
147
250
gpgme_engine_info_t engine_info;
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
* Helper function to insert pub and seckey to the engine keyring.
256
bool import_key(const char *filename){
259
gpgme_data_t pgp_data;
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
283
perror_plus("close");
285
gpgme_data_release(pgp_data);
290
fprintf_plus(stderr, "Initializing GPGME\n");
154
294
gpgme_check_version(NULL);
155
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
162
302
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
166
gpgme_strsource(rc), gpgme_strerror(rc));
303
rc = gpgme_get_engine_info(&engine_info);
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
169
309
while(engine_info != NULL){
170
310
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
171
311
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
172
engine_info->file_name, homedir);
312
engine_info->file_name, tempdir);
175
315
engine_info = engine_info->next;
177
317
if(engine_info == NULL){
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(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_plus(stderr, "Trying to decrypt OpenPGP data\n");
182
356
/* Create new GPGME data buffer from memory cryptotext */
183
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
if (rc != GPG_ERR_NO_ERROR){
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
187
gpgme_strsource(rc), gpgme_strerror(rc));
359
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
191
365
/* Create new empty GPGME data buffer for the plaintext */
192
366
rc = gpgme_data_new(&dh_plain);
193
if (rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
196
371
gpgme_data_release(dh_crypto);
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
209
375
/* Decrypt data from the cryptotext data buffer to the plaintext
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
214
gpgme_strsource(rc), gpgme_strerror(rc));
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
215
381
plaintext_length = -1;
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
383
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
392
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
239
397
while(recipient != NULL){
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
246
405
recipient = recipient->next;
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
252
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
255
419
plaintext_length = -1;
256
420
goto decrypt_end;
259
423
*plaintext = NULL;
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
428
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
270
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
436
/* Print the data, if any */
278
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
279
443
plaintext_length = -1;
280
444
goto decrypt_end;
282
446
plaintext_length += ret;
286
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
287
451
for(ssize_t i = 0; i < plaintext_length; i++){
288
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
436
619
/* Called when a Mandos server is found */
437
620
static int start_mandos_communication(const char *ip, uint16_t port,
438
621
AvahiIfIndex if_index,
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
623
int ret, tcp_sd = -1;
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
442
629
char *buffer = NULL;
443
char *decrypted_buffer;
630
char *decrypted_buffer = NULL;
444
631
size_t buffer_length = 0;
445
632
size_t buffer_capacity = 0;
446
ssize_t decrypted_buffer_size;
449
char interface[IF_NAMESIZE];
450
635
gnutls_session_t session;
452
ret = init_gnutls_session (mc, &session);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
473
fprintf(stderr, "Binding to interface %s\n", interface);
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
636
int pf; /* Protocol family */
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
ret = init_gnutls_session(&session);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
perror_plus("socket");
681
memset(&to, 0, sizeof(to));
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
691
perror_plus("inet_pton");
486
fprintf(stderr, "Bad address: %s\n", ip);
489
to.in6.sin6_port = htons(port); /* Spurious warning */
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
704
-Wunreachable-code */
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
715
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
719
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wunreachable-code */
491
to.in6.sin6_scope_id = (uint32_t)if_index;
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
char interface[IF_NAMESIZE];
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
753
perror_plus("inet_ntop");
500
755
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
506
ret = connect(tcp_sd, &to.in, sizeof(to));
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
perror_plus("connect");
512
785
const char *out = mandos_protocol_version;
515
788
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
793
perror_plus("write");
523
797
written += (size_t)ret;
524
798
if(written < out_size){
527
if (out == mandos_protocol_version){
801
if(out == mandos_protocol_version){
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
ret = gnutls_handshake (session);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
833
ret = gnutls_handshake(session);
544
838
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
546
if (ret != GNUTLS_E_SUCCESS){
840
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
555
849
/* Read OpenPGP packet that contains the wanted password */
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
571
ret = gnutls_record_recv(session, buffer+buffer_length,
863
buffer_capacity = incbuffer(&buffer, buffer_length,
865
if(buffer_capacity == 0){
867
perror_plus("incbuffer");
877
sret = gnutls_record_recv(session, buffer+buffer_length,
578
884
case GNUTLS_E_INTERRUPTED:
579
885
case GNUTLS_E_AGAIN:
581
887
case GNUTLS_E_REHANDSHAKE:
583
ret = gnutls_handshake (session);
889
ret = gnutls_handshake(session);
584
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
593
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
buffer_length += (size_t) ret;
912
buffer_length += (size_t) sret;
605
fprintf(stderr, "Closing TLS session\n");
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
if (decrypted_buffer_size >= 0){
917
fprintf_plus(stderr, "Closing TLS session\n");
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
933
if(buffer_length > 0){
934
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
937
if(decrypted_buffer_size >= 0){
617
940
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
946
ret = (int)fwrite(decrypted_buffer + written, 1,
947
(size_t)decrypted_buffer_size - written,
621
949
if(ret == 0 and ferror(stdout)){
623
fprintf(stderr, "Error writing encrypted data: %s\n",
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
629
958
written += (size_t)ret;
631
free(decrypted_buffer);
637
964
/* Shutdown procedure */
642
gnutls_deinit (session);
969
free(decrypted_buffer);
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
perror_plus("close");
980
gnutls_deinit(session);
646
990
static void resolve_callback(AvahiSServiceResolver *r,
647
991
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
649
993
AvahiResolverEvent event,
650
994
const char *name,
651
995
const char *type,
733
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
734
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
736
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
752
memcpy(tmp, first, f_len); /* Spurious warning */
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
tmp[f_len + 1 + s_len] = '\0';
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1108
signal_received = sig;
1109
int old_errno = errno;
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1122
perror_plus("socket");
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1129
perror_plus("ioctl SIOCGIFFLAGS");
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
/* Accept this device */
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1189
if(not get_flags(if_entry->d_name, &ifr)){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1197
if(not good_flags(if_entry->d_name, &ifr)){
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1214
if(not get_flags(if_entry->d_name, &ifr)){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if(not good_flags(if_entry->d_name, &ifr)){
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1263
if((direntry->d_name)[0] == '\0'){
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
perror_plus("asprintf");
1288
ret = stat(fullname, &st);
1291
perror_plus("Could not stat hook");
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1325
if(mc.current_server == NULL){
1327
fprintf_plus(stderr, "Wait until first server is found."
1330
ret = avahi_simple_poll_iterate(s, -1);
1333
fprintf_plus(stderr, "Check current_server if we should run"
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1339
perror_plus("clock_gettime");
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1366
avahi_simple_poll_quit(mc.simple_poll);
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1372
perror_plus("clock_gettime");
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1390
bool run_network_hooks(const char *mode, const char *interface,
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1398
perror_plus("scandir");
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1406
perror_plus("asprintf");
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1413
pid_t hook_pid = fork();
1416
/* Raise privileges */
1420
perror_plus("seteuid");
1422
/* Raise privileges even more */
1426
perror_plus("setuid");
1432
perror_plus("setgid");
1434
/* Reset supplementary groups */
1436
ret = setgroups(0, NULL);
1438
perror_plus("setgroups");
1440
dup2(devnull, STDIN_FILENO);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1445
perror_plus("setenv");
1448
ret = setenv("DEVICE", interface, 1);
1450
perror_plus("setenv");
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1455
perror_plus("setenv");
1458
ret = setenv("MODE", mode, 1);
1460
perror_plus("setenv");
1464
ret = asprintf(&delaystring, "%f", delay);
1466
perror_plus("asprintf");
1469
ret = setenv("DELAY", delaystring, 1);
1472
perror_plus("setenv");
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1479
perror_plus("setenv");
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
763
1526
int main(int argc, char *argv[]){
764
AvahiSServiceBrowser *sb = NULL;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
787
.doc = "Connect directly to a sepcified mandos server",
789
{ .name = "interface", .key = 'i',
791
.doc = "Interface that Avahi will conntect through",
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory where the openpgp keyring is",
797
{ .name = "seckey", .key = 's',
799
.doc = "Secret openpgp key for gnutls authentication",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "Public openpgp key for gnutls authentication",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "dh-bits to use in gnutls communication",
809
{ .name = "priority", .key = 130,
811
.doc = "GNUTLS priority", .group = 1 },
1527
AvahiSServiceBrowser *sb = NULL;
1532
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1536
bool take_down_interface = false;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
const char *seckey = PATHDIR "/" SECKEY;
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1545
bool gnutls_initialized = false;
1546
bool gpgme_initialized = false;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1552
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1557
/* Lower any group privileges we might have, just to be safe */
1561
perror_plus("setgid");
1564
/* Lower user privileges (temporarily) */
1568
perror_plus("seteuid");
1576
struct argp_option options[] = {
1577
{ .name = "debug", .key = 128,
1578
.doc = "Debug mode", .group = 3 },
1579
{ .name = "connect", .key = 'c',
1580
.arg = "ADDRESS:PORT",
1581
.doc = "Connect directly to a specific Mandos server",
1583
{ .name = "interface", .key = 'i',
1585
.doc = "Network interface that will be used to search for"
1588
{ .name = "seckey", .key = 's',
1590
.doc = "OpenPGP secret key file base name",
1592
{ .name = "pubkey", .key = 'p',
1594
.doc = "OpenPGP public key file base name",
1596
{ .name = "dh-bits", .key = 129,
1598
.doc = "Bit length of the prime number used in the"
1599
" Diffie-Hellman key exchange",
1601
{ .name = "priority", .key = 130,
1603
.doc = "GnuTLS priority string for the TLS handshake",
1605
{ .name = "delay", .key = 131,
1607
.doc = "Maximum delay to wait for interface startup",
1609
{ .name = "retry", .key = 132,
1611
.doc = "Retry interval used when denied by the Mandos server",
1613
{ .name = "network-hook-dir", .key = 133,
1615
.doc = "Directory where network hooks are located",
1618
* These reproduce what we would get without ARGP_NO_HELP
1620
{ .name = "help", .key = '?',
1621
.doc = "Give this help list", .group = -1 },
1622
{ .name = "usage", .key = -3,
1623
.doc = "Give a short usage message", .group = -1 },
1624
{ .name = "version", .key = 'V',
1625
.doc = "Print program version", .group = -1 },
1629
error_t parse_opt(int key, char *arg,
1630
struct argp_state *state){
1633
case 128: /* --debug */
1636
case 'c': /* --connect */
1639
case 'i': /* --interface */
1642
case 's': /* --seckey */
1645
case 'p': /* --pubkey */
1648
case 129: /* --dh-bits */
1650
tmpmax = strtoimax(arg, &tmp, 10);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'
1652
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1653
argp_error(state, "Bad number of DH bits");
1655
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1657
case 130: /* --priority */
1660
case 131: /* --delay */
1662
delay = strtof(arg, &tmp);
1663
if(errno != 0 or tmp == arg or *tmp != '\0'){
1664
argp_error(state, "Bad delay");
1666
case 132: /* --retry */
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1675
case 133: /* --network-hook-dir */
1679
* These reproduce what we would get without ARGP_NO_HELP
1681
case '?': /* --help */
1682
argp_state_help(state, state->out_stream,
1683
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1684
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1685
case -3: /* --usage */
1686
argp_state_help(state, state->out_stream,
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1690
exit(argp_err_exit_status);
1693
return ARGP_ERR_UNKNOWN;
1698
struct argp argp = { .options = options, .parser = parse_opt,
1700
.doc = "Mandos client -- Get and decrypt"
1701
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1710
perror_plus("argp_parse");
1711
exitcode = EX_OSERR;
1714
exitcode = EX_USAGE;
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1723
/* Re-raise priviliges */
1727
perror_plus("seteuid");
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1738
perror_plus("fstat");
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1744
perror_plus("fchown");
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1759
perror_plus("fstat");
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1765
perror_plus("fchown");
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
/* Lower privileges */
1777
perror_plus("seteuid");
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1788
avahi_set_log_function(empty_log);
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1797
/* No up interfaces, look for any good interfaces */
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1808
if(interface == NULL){
1809
perror_plus("malloc");
868
1811
exitcode = EXIT_FAILURE;
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
1817
fprintf_plus(stderr, "Could not find a network interface\n");
876
1818
exitcode = EXIT_FAILURE;
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
fprintf(stderr, "init_gnutls_global\n");
891
gnutls_initalized = true;
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
from the signal handler */
1825
/* Initialize the pseudo-RNG for Avahi */
1826
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1831
exitcode = EX_UNAVAILABLE;
1835
sigemptyset(&sigterm_action.sa_mask);
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1842
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1844
perror_plus("sigaddset");
1845
exitcode = EX_OSERR;
1848
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1850
perror_plus("sigaddset");
1851
exitcode = EX_OSERR;
1854
/* Need to check if the handler is SIG_IGN before handling:
1855
| [[info:libc:Initial Signal Actions]] |
1856
| [[info:libc:Basic Signal Handling]] |
1858
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1860
perror_plus("sigaction");
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGINT, &sigterm_action, NULL);
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1871
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1873
perror_plus("sigaction");
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1884
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1886
perror_plus("sigaction");
1889
if(old_sigterm_action.sa_handler != SIG_IGN){
1890
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1892
perror_plus("sigaction");
1893
exitcode = EX_OSERR;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
907
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
908
1901
if(if_index == 0){
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
933
exitcode = EXIT_FAILURE;
935
exitcode = EXIT_SUCCESS;
940
/* If the interface is down, bring it up */
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
945
exitcode = EXIT_FAILURE;
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1911
/* Re-raise priviliges */
1915
perror_plus("seteuid");
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1927
#endif /* __linux__ */
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1937
perror_plus("klogctl");
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1945
perror_plus("seteuid");
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1952
perror_plus("ioctl SIOCGIFFLAGS");
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1957
perror_plus("klogctl");
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1966
perror_plus("seteuid");
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1982
perror_plus("klogctl");
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1990
perror_plus("seteuid");
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2014
perror_plus("close");
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2022
perror_plus("klogctl");
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2028
/* Lower privileges */
2031
perror_plus("seteuid");
2039
ret = init_gnutls_global(pubkey, seckey);
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
exitcode = EX_UNAVAILABLE;
2045
gnutls_initialized = true;
2052
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
2056
tempdir_created = true;
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "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_plus(stderr, "No colon in address\n");
2080
exitcode = EX_USAGE;
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
2094
exitcode = EX_USAGE;
2102
port = (uint16_t)tmpmax;
2104
/* Colon in address indicates IPv6 */
2106
if(strchr(connect_to, ':') != NULL){
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2117
address = connect_to;
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2132
sleep((int)retry_interval);
2136
exitcode = EXIT_SUCCESS;
2147
AvahiServerConfig config;
2148
/* Do not publish any local Zeroconf records */
2149
avahi_server_config_init(&config);
2150
config.publish_hinfo = 0;
2151
config.publish_addresses = 0;
2152
config.publish_workstation = 0;
2153
config.publish_domain = 0;
2155
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2160
/* Free the Avahi configuration data */
2161
avahi_server_config_free(&config);
2164
/* Check if creating the Avahi server object succeeded */
2165
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2168
exitcode = EX_UNAVAILABLE;
2176
/* Create the Avahi service browser */
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2183
exitcode = EX_UNAVAILABLE;
2191
/* Run the main loop */
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2210
/* Cleanup things */
2212
avahi_s_service_browser_free(sb);
2214
if(mc.server != NULL)
2215
avahi_server_free(mc.server);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2220
if(gnutls_initialized){
2221
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
gnutls_dh_params_deinit(mc.dh_params);
2226
if(gpgme_initialized){
2227
gpgme_release(mc.ctx);
2230
/* Cleans up the circular linked list of Mandos servers the client
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2244
/* Re-raise priviliges */
2249
perror_plus("seteuid");
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
957
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
968
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1021
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1035
/* Cleanup things */
1037
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2266
perror_plus("close");
2270
/* Lower privileges permanently */
2274
perror_plus("setuid");
2277
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2290
perror_plus("asprintf");
2293
ret = remove(fullname);
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2302
/* need to clean even if 0 because man page doesn't specify */
2304
if (numentries == -1){
2305
perror_plus("scandir");
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2314
sigemptyset(&old_sigterm_action.sa_mask);
2315
old_sigterm_action.sa_handler = SIG_DFL;
2316
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2317
&old_sigterm_action,
2320
perror_plus("sigaction");
2323
ret = raise(signal_received);
2324
} while(ret != 0 and errno == EINTR);
2326
perror_plus("raise");
2329
TEMP_FAILURE_RETRY(pause());