156
164
const char *priority;
158
166
server *current_server;
168
size_t interfaces_size;
159
169
} mandos_context;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
167
174
sig_atomic_t quit_now = 0;
168
175
int signal_received = 0;
170
177
/* Function to use when printing errors */
171
178
void perror_plus(const char *print_text){
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
174
183
perror(print_text);
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_start (ap, format);
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
178
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
198
* bytes. "buffer_capacity" is how much is currently allocated,
180
199
* "buffer_length" is how much is already used.
201
__attribute__((nonnull, warn_unused_result))
182
202
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
203
size_t buffer_capacity){
184
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
int old_errno = errno;
189
214
buffer_capacity += BUFFER_SIZE;
191
216
return buffer_capacity;
194
219
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
199
224
server *new_server = malloc(sizeof(server));
200
225
if(new_server == NULL){
201
226
perror_plus("malloc");
204
229
*new_server = (server){ .ip = strdup(ip),
206
.if_index = if_index,
231
.if_index = if_index,
208
233
if(new_server->ip == NULL){
209
234
perror_plus("strdup");
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
perror_plus("clock_gettime");
212
242
/* Special case of first server */
213
if (mc.current_server == NULL){
243
if(*current_server == NULL){
214
244
new_server->next = new_server;
215
245
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
246
*current_server = new_server;
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
221
251
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
226
perror_plus("clock_gettime");
252
(*current_server)->prev = new_server;
233
258
* Initialize GPGME.
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
237
265
gpgme_error_t rc;
238
266
gpgme_engine_info_t engine_info;
242
269
* Helper function to insert pub and seckey to the engine keyring.
244
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
247
274
gpgme_data_t pgp_data;
343
367
ssize_t plaintext_length = 0;
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
350
373
/* Create new GPGME data buffer from memory cryptotext */
351
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
353
376
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
360
382
/* Create new empty GPGME data buffer for the plaintext */
361
383
rc = gpgme_data_new(&dh_plain);
362
384
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
366
388
gpgme_data_release(dh_crypto);
370
392
/* Decrypt data from the cryptotext data buffer to the plaintext
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
395
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
377
398
plaintext_length = -1;
379
400
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
381
402
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
391
409
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
395
412
gpgme_recipient_t recipient;
396
413
recipient = result->recipients;
397
414
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
407
422
recipient = recipient->next;
509
524
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
526
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
514
529
gnutls_global_deinit();
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
525
540
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
527
542
GNUTLS_OPENPGP_FMT_BASE64);
528
543
if(ret != GNUTLS_E_SUCCESS){
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
538
552
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
540
554
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
561
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
560
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
561
574
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
566
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
568
583
/* GnuTLS session creation */
745
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
779
perror_plus("if_indextoname");
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
756
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
790
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
767
perror_plus("inet_ntop");
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1045
1082
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1083
avahi_address_snprint(ip, sizeof(ip), address);
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
avahi_proto_to_af(proto),
1056
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1128
1174
signal_received = sig;
1129
1175
int old_errno = errno;
1130
1176
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1134
1180
errno = old_errno;
1183
__attribute__((nonnull, warn_unused_result))
1137
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1140
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1142
1191
perror_plus("socket");
1145
1195
strcpy(ifr->ifr_name, ifname);
1146
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1149
1200
perror_plus("ioctl SIOCGIFFLAGS");
1208
__attribute__((nonnull, warn_unused_result))
1156
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1158
1211
/* Reject the loopback device */
1159
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1166
1219
/* Accept point-to-point devices only if connect_to is specified */
1167
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1174
1227
/* Otherwise, reject non-broadcast-capable devices */
1175
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1182
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1236
if(ifr->ifr_flags & IFF_NOARP){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1191
1244
/* Accept this device */
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1209
1262
struct ifreq ifr;
1210
1263
if(not get_flags(if_entry->d_name, &ifr)){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1219
if(not good_flags(if_entry->d_name, &ifr)){
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1236
if(not get_flags(if_entry->d_name, &ifr)){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1265
if(not good_flags(if_entry->d_name, &ifr)){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1271
if(not good_flags(if_entry->d_name, &ifr)){
1278
* This function determines if a network interface is up.
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1283
if(not get_flags(interface, &ifr)){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1295
* This function determines if a network interface is running
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1300
if(not get_flags(interface, &ifr)){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
__attribute__((nonnull, pure, warn_unused_result))
1271
1312
int notdotentries(const struct dirent *direntry){
1272
1313
/* Skip "." and ".." */
1273
1314
if(direntry->d_name[0] == '.'
1397
1450
ret = avahi_simple_poll_iterate(s, (int)block_time);
1400
if (ret > 0 or errno != EINTR){
1453
if(ret > 0 or errno != EINTR){
1401
1454
return (ret != 1) ? ret : 0;
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1467
perror_plus("seteuid");
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1482
if(setuid(0) == -1){
1484
perror_plus("seteuid");
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1497
perror_plus("seteuid");
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1510
perror_plus("setuid");
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1519
struct dirent **direntries;
1520
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1523
if(errno == ENOENT){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1529
perror_plus("scandir");
1532
struct dirent *direntry;
1534
int devnull = open("/dev/null", O_RDONLY);
1535
for(int i = 0; i < numhooks; i++){
1536
direntry = direntries[i];
1537
char *fullname = NULL;
1538
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1540
perror_plus("asprintf");
1544
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
pid_t hook_pid = fork();
1550
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1559
perror_plus("setgid");
1562
/* Reset supplementary groups */
1564
ret = setgroups(0, NULL);
1566
perror_plus("setgroups");
1569
ret = dup2(devnull, STDIN_FILENO);
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1574
ret = close(devnull);
1576
perror_plus("close");
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1584
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1586
perror_plus("setenv");
1589
ret = setenv("DEVICE", interface, 1);
1591
perror_plus("setenv");
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1596
perror_plus("setenv");
1599
ret = setenv("MODE", mode, 1);
1601
perror_plus("setenv");
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1607
perror_plus("asprintf");
1610
ret = setenv("DELAY", delaystring, 1);
1613
perror_plus("setenv");
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1620
perror_plus("setenv");
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1630
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1631
perror_plus("waitpid");
1635
if(WIFEXITED(status)){
1636
if(WEXITSTATUS(status) != 0){
1637
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1638
" with status %d\n", direntry->d_name,
1639
WEXITSTATUS(status));
1643
} else if(WIFSIGNALED(status)){
1644
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1645
" signal %d\n", direntry->d_name,
1650
fprintf_plus(stderr, "Warning: network hook \"%s\""
1651
" crashed\n", direntry->d_name);
1658
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1666
__attribute__((nonnull, warn_unused_result))
1667
error_t bring_up_interface(const char *const interface,
1669
error_t old_errno = errno;
1671
struct ifreq network;
1672
unsigned int if_index = if_nametoindex(interface);
1674
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1684
if(not interface_is_up(interface)){
1685
error_t ret_errno = 0, ioctl_errno = 0;
1686
if(not get_flags(interface, &network)){
1688
fprintf_plus(stderr, "Failed to get flags for interface "
1689
"\"%s\"\n", interface);
1693
network.ifr_flags |= IFF_UP; /* set flag */
1695
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1698
perror_plus("socket");
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
perror_plus("close");
1713
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1717
/* Raise privileges */
1718
ret_errno = raise_privileges();
1720
perror_plus("Failed to raise privileges");
1725
bool restore_loglevel = false;
1727
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1728
messages about the network interface to mess up the prompt */
1729
ret_linux = klogctl(8, NULL, 5);
1730
if(ret_linux == -1){
1731
perror_plus("klogctl");
1733
restore_loglevel = true;
1736
#endif /* __linux__ */
1737
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
ioctl_errno = errno;
1740
if(restore_loglevel){
1741
ret_linux = klogctl(7, NULL, 0);
1742
if(ret_linux == -1){
1743
perror_plus("klogctl");
1746
#endif /* __linux__ */
1748
/* If raise_privileges() succeeded above */
1750
/* Lower privileges */
1751
ret_errno = lower_privileges();
1754
perror_plus("Failed to lower privileges");
1758
/* Close the socket */
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1761
perror_plus("close");
1764
if(ret_setflags == -1){
1765
errno = ioctl_errno;
1766
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1771
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1775
/* Sleep checking until interface is running.
1776
Check every 0.25s, up to total time of delay */
1777
for(int i=0; i < delay * 4; i++){
1778
if(interface_is_running(interface)){
1781
struct timespec sleeptime = { .tv_nsec = 250000000 };
1782
ret = nanosleep(&sleeptime, NULL);
1783
if(ret == -1 and errno != EINTR){
1784
perror_plus("nanosleep");
1792
__attribute__((nonnull, warn_unused_result))
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
1795
struct ifreq network;
1796
unsigned int if_index = if_nametoindex(interface);
1798
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1802
if(interface_is_up(interface)){
1803
error_t ret_errno = 0, ioctl_errno = 0;
1804
if(not get_flags(interface, &network) and debug){
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", interface);
1811
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1813
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1816
perror_plus("socket");
1822
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1826
/* Raise privileges */
1827
ret_errno = raise_privileges();
1829
perror_plus("Failed to raise privileges");
1832
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1833
ioctl_errno = errno;
1835
/* If raise_privileges() succeeded above */
1837
/* Lower privileges */
1838
ret_errno = lower_privileges();
1841
perror_plus("Failed to lower privileges");
1845
/* Close the socket */
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1848
perror_plus("close");
1851
if(ret_setflags == -1){
1852
errno = ioctl_errno;
1853
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1858
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1407
1866
int main(int argc, char *argv[]){
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
1408
1871
AvahiSServiceBrowser *sb = NULL;
1411
1874
intmax_t tmpmax;
1413
1876
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1417
bool take_down_interface = false;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
1877
char *interfaces_to_take_down = NULL;
1878
size_t interfaces_to_take_down_size = 0;
1879
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1880
char old_tempdir[] = "/tmp/mandosXXXXXX";
1881
char *tempdir = NULL;
1422
1882
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
1883
const char *seckey = PATHDIR "/" SECKEY;
1424
1884
const char *pubkey = PATHDIR "/" PUBKEY;
1885
char *interfaces_hooks = NULL;
1426
1887
bool gnutls_initialized = false;
1427
1888
bool gpgme_initialized = false;
1602
2066
/* Work around Debian bug #633582:
1603
2067
<http://bugs.debian.org/633582> */
1606
/* Re-raise priviliges */
1610
perror_plus("seteuid");
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
perror_plus("fstat");
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1625
perror_plus("fchown");
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
perror_plus("fstat");
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1645
perror_plus("fchown");
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1653
/* Lower privileges */
1657
perror_plus("seteuid");
1661
/* Find network hooks and run them */
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1668
perror_plus("scandir");
2069
/* Re-raise privileges */
2070
ret_errno = raise_privileges();
2073
perror_plus("Failed to raise privileges");
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1676
perror_plus("asprintf");
1679
pid_t hook_pid = fork();
1682
dup2(devnull, STDIN_FILENO);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1687
perror_plus("setenv");
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1692
perror_plus("setenv");
1695
ret = setenv("MODE", "start", 1);
1697
perror_plus("setenv");
1701
ret = asprintf(&delaystring, "%f", delay);
1703
perror_plus("asprintf");
1706
ret = setenv("DELAY", delaystring, 1);
1709
perror_plus("setenv");
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
2077
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2078
int seckey_fd = open(seckey, O_RDONLY);
2079
if(seckey_fd == -1){
2080
perror_plus("open");
2082
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2084
perror_plus("fstat");
2086
if(S_ISREG(st.st_mode)
2087
and st.st_uid == 0 and st.st_gid == 0){
2088
ret = fchown(seckey_fd, uid, gid);
2090
perror_plus("fchown");
2094
TEMP_FAILURE_RETRY(close(seckey_fd));
2098
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2099
int pubkey_fd = open(pubkey, O_RDONLY);
2100
if(pubkey_fd == -1){
2101
perror_plus("open");
2103
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2105
perror_plus("fstat");
2107
if(S_ISREG(st.st_mode)
2108
and st.st_uid == 0 and st.st_gid == 0){
2109
ret = fchown(pubkey_fd, uid, gid);
2111
perror_plus("fchown");
2115
TEMP_FAILURE_RETRY(close(pubkey_fd));
2119
/* Lower privileges */
2120
ret_errno = lower_privileges();
2123
perror_plus("Failed to lower privileges");
2128
/* Remove invalid interface names (except "none") */
2130
char *interface = NULL;
2131
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2133
if(strcmp(interface, "none") != 0
2134
and if_nametoindex(interface) == 0){
2135
if(interface[0] != '\0'){
2136
fprintf_plus(stderr, "Not using nonexisting interface"
2137
" \"%s\"\n", interface);
2139
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2145
/* Run network hooks */
2147
if(mc.interfaces != NULL){
2148
interfaces_hooks = malloc(mc.interfaces_size);
2149
if(interfaces_hooks == NULL){
2150
perror_plus("malloc");
2153
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2154
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2156
run_network_hooks("start", interfaces_hooks != NULL ?
2157
interfaces_hooks : "", delay);
1756
2161
avahi_set_log_function(empty_log);
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1765
/* No up interfaces, look for any good interfaces */
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1777
if(interface == NULL){
1778
perror_plus("malloc");
1780
exitcode = EXIT_FAILURE;
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1793
2164
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2165
from the signal handler */
1795
2166
/* Initialize the pseudo-RNG for Avahi */
1796
2167
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2168
simple_poll = avahi_simple_poll_new();
2169
if(simple_poll == NULL){
2170
fprintf_plus(stderr,
2171
"Avahi: Failed to create simple poll object.\n");
1801
2172
exitcode = EX_UNAVAILABLE;
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1882
/* Re-raise priviliges */
1886
perror_plus("seteuid");
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1898
#endif /* __linux__ */
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1908
perror_plus("klogctl");
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1916
perror_plus("seteuid");
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1923
perror_plus("ioctl SIOCGIFFLAGS");
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1928
perror_plus("klogctl");
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1937
perror_plus("seteuid");
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1953
perror_plus("klogctl");
2239
/* If no interfaces were specified, make a list */
2240
if(mc.interfaces == NULL){
2241
struct dirent **direntries;
2242
/* Look for any good interfaces */
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2246
/* Add all found interfaces to interfaces list */
2247
for(int i = 0; i < ret; ++i){
2248
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2249
direntries[i]->d_name);
2252
perror_plus("argz_add");
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2257
direntries[i]->d_name);
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2264
exitcode = EXIT_FAILURE;
2269
/* Bring up interfaces which are down, and remove any "none"s */
2271
char *interface = NULL;
2272
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2274
/* If interface name is "none", stop bringing up interfaces.
2275
Also remove all instances of "none" from the list */
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2280
while((interface = argz_next(mc.interfaces,
2281
mc.interfaces_size, interface))){
2282
if(strcmp(interface, "none") == 0){
2283
argz_delete(&mc.interfaces, &mc.interfaces_size,
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1961
perror_plus("seteuid");
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1985
perror_plus("close");
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1993
perror_plus("klogctl");
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1999
if(take_down_interface){
2000
/* Lower privileges */
2003
perror_plus("seteuid");
2006
/* Lower privileges permanently */
2009
perror_plus("setuid");
2290
bool interface_was_up = interface_is_up(interface);
2291
errno = bring_up_interface(interface, delay);
2292
if(not interface_was_up){
2294
perror_plus("Failed to bring up interface");
2296
errno = argz_add(&interfaces_to_take_down,
2297
&interfaces_to_take_down_size,
2300
perror_plus("argz_add");
2305
if(debug and (interfaces_to_take_down == NULL)){
2306
fprintf_plus(stderr, "No interfaces were brought up\n");
2310
/* If we only got one interface, explicitly use only that one */
2311
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2313
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2316
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2018
ret = init_gnutls_global(pubkey, seckey);
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2325
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2326
exitcode = EX_UNAVAILABLE;
2229
/* XXX run network hooks "stop" here */
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2237
perror_plus("seteuid");
2537
/* Re-raise privileges */
2539
ret_errno = raise_privileges();
2541
perror_plus("Failed to raise privileges");
2544
/* Run network hooks */
2545
run_network_hooks("stop", interfaces_hooks != NULL ?
2546
interfaces_hooks : "", delay);
2548
/* Take down the network interfaces which were brought up */
2550
char *interface = NULL;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2554
ret_errno = take_down_interface(interface);
2557
perror_plus("Failed to take down interface");
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces needed to be taken"
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
perror_plus("close");
2254
/* Lower privileges permanently */
2258
perror_plus("setuid");
2567
ret_errno = lower_privileges_permanently();
2569
perror_plus("Failed to lower privileges permanently");
2573
free(interfaces_to_take_down);
2574
free(interfaces_hooks);
2263
2576
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2577
if(tempdir != NULL){
2265
2578
struct dirent **direntries = NULL;
2266
2579
struct dirent *direntry = NULL;
2267
2580
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
if (numentries > 0){
2270
2583
for(int i = 0; i < numentries; i++){
2271
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direntry = direntries[i];
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char *fullname = NULL;