174
170
perror(print_text);
177
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_start (ap, format);
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
175
* bytes. "buffer_capacity" is how much is currently allocated,
189
176
* "buffer_length" is how much is already used.
191
178
size_t incbuffer(char **buffer, size_t buffer_length,
192
size_t buffer_capacity){
179
size_t buffer_capacity){
193
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
182
if(buffer == NULL){
263
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
252
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
270
258
rc = gpgme_op_import(mc.ctx, pgp_data);
271
259
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
290
278
gpgme_check_version(NULL);
291
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
280
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
298
286
/* Set GPGME home directory for the OpenPGP engine only */
299
287
rc = gpgme_get_engine_info(&engine_info);
300
288
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
305
293
while(engine_info != NULL){
311
299
engine_info = engine_info->next;
313
301
if(engine_info == NULL){
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
319
306
/* Create new GPGME "context" */
320
307
rc = gpgme_new(&(mc.ctx));
321
308
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
346
332
ssize_t plaintext_length = 0;
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
352
338
/* Create new GPGME data buffer from memory cryptotext */
353
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
341
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
361
347
/* Create new empty GPGME data buffer for the plaintext */
362
348
rc = gpgme_data_new(&dh_plain);
363
349
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
367
352
gpgme_data_release(dh_crypto);
373
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
359
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
377
362
plaintext_length = -1;
379
364
gpgme_decrypt_result_t result;
380
365
result = gpgme_op_decrypt_result(mc.ctx);
381
366
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
388
373
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
391
376
gpgme_recipient_t recipient;
392
377
recipient = result->recipients;
393
378
while(recipient != NULL){
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
401
385
recipient = recipient->next;
500
484
/* OpenPGP credentials */
501
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
502
486
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
505
489
gnutls_global_deinit();
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
516
499
ret = gnutls_certificate_set_openpgp_key_file
517
500
(mc.cred, pubkeyfilename, seckeyfilename,
518
501
GNUTLS_OPENPGP_FMT_BASE64);
519
502
if(ret != GNUTLS_E_SUCCESS){
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
528
511
/* GnuTLS server initialization */
529
512
ret = gnutls_dh_params_init(&mc.dh_params);
530
513
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
536
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
519
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
728
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
710
perror_plus("if_indextoname");
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
738
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1020
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1021
1001
avahi_address_snprint(ip, sizeof(ip), address);
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1027
1007
int ret = start_mandos_communication(ip, port, interface,
1028
1008
avahi_proto_to_af(proto));
1074
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
1055
name, type, domain, protocol, 0,
1076
1056
resolve_callback, NULL) == NULL)
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
avahi_strerror(avahi_server_errno(mc.server)));
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1082
1061
case AVAHI_BROWSER_REMOVE:
1107
1085
errno = old_errno;
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1093
int good_interface(const struct dirent *if_entry){
1096
if(if_entry->d_name[0] == '.'){
1113
1099
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1101
perror_plus("socket");
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1105
strcpy(ifr.ifr_name, if_entry->d_name);
1106
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
1122
1109
perror_plus("ioctl SIOCGIFFLAGS");
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1113
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1114
if(ifr.ifr_flags & IFF_LOOPBACK){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1116
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1139
1121
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1122
if(connect_to != NULL and (ifr.ifr_flags & IFF_POINTOPOINT)){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1124
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1147
1129
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1130
if(not (ifr.ifr_flags & IFF_BROADCAST)){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1132
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1155
1137
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1138
if(ifr.ifr_flags & IFF_NOARP){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1140
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
1145
/* Accept this device */
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1182
if(not get_flags(if_entry->d_name, &ifr)){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1190
if(not good_flags(if_entry->d_name, &ifr)){
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if(not good_flags(if_entry->d_name, &ifr)){
1147
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1256
if((direntry->d_name)[0] == '\0'){
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
perror_plus("asprintf");
1281
ret = stat(fullname, &st);
1284
perror_plus("Could not stat hook");
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
1164
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1309
1166
struct timespec now;
1369
1225
ret = avahi_simple_poll_iterate(s, (int)block_time);
1372
if (ret > 0 or errno != EINTR){
1228
if (ret > 0 or errno != EINTR) {
1373
1229
return (ret != 1) ? ret : 0;
1379
bool run_network_hooks(const char *mode, const char *interface,
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1387
perror_plus("scandir");
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1395
perror_plus("asprintf");
1398
pid_t hook_pid = fork();
1401
dup2(devnull, STDIN_FILENO);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1406
perror_plus("setenv");
1409
ret = setenv("DEVICE", interface, 1);
1411
perror_plus("setenv");
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1416
perror_plus("setenv");
1419
ret = setenv("MODE", mode, 1);
1421
perror_plus("setenv");
1425
ret = asprintf(&delaystring, "%f", delay);
1427
perror_plus("asprintf");
1430
ret = setenv("DELAY", delaystring, 1);
1433
perror_plus("setenv");
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1477
1235
int main(int argc, char *argv[]){
1478
1236
AvahiSServiceBrowser *sb = NULL;
1734
/* Run network hooks */
1736
/* Re-raise priviliges */
1740
perror_plus("seteuid");
1742
if(not run_network_hooks("start", interface, delay)){
1745
/* Lower privileges */
1749
perror_plus("seteuid");
1754
1482
avahi_set_log_function(empty_log);
1757
1485
if(interface[0] == '\0'){
1758
1486
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1487
ret = scandir(sys_class_net, &direntries, good_interface,
1763
/* No up interfaces, look for any good interfaces */
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1769
/* Pick the first interface returned */
1490
/* Pick the first good interface */
1770
1491
interface = strdup(direntries[0]->d_name);
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1493
fprintf(stderr, "Using interface \"%s\"\n", interface);
1774
1495
if(interface == NULL){
1775
1496
perror_plus("malloc");
2157
1885
/* Run the main loop */
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
1888
fprintf(stderr, "Starting Avahi loop search\n");
2163
1891
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
1892
(int)(retry_interval * 1000));
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
(ret == 0) ? "successfully" : "with error");
1894
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1895
(ret == 0) ? "successfully" : "with error");
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1901
fprintf(stderr, "%s exiting\n", argv[0]);
2176
1904
/* Cleanup things */
2207
/* Re-raise priviliges */
1935
/* Take down the network interface */
1936
if(take_down_interface){
1937
/* Re-raise priviliges */
2210
1939
ret = seteuid(0);
2212
1941
perror_plus("seteuid");
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
1944
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2223
1946
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
1947
} else if(network.ifr_flags & IFF_UP) {
2225
1948
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
1949
ret = ioctl(sd, SIOCSIFFLAGS, &network);