122
132
#define PATHDIR "/conf/conf.d/mandos"
123
133
#define SECKEY "seckey.txt"
124
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
137
bool debug = false;
127
138
static const char mandos_protocol_version[] = "1";
128
139
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
141
static const char sys_class_net[] = "/sys/class/net";
131
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
152
AvahiIfIndex if_index;
154
struct timespec last_seen;
133
159
/* Used for passing in values through the Avahi callback functions */
135
AvahiSimplePoll *simple_poll;
136
161
AvahiServer *server;
137
162
gnutls_certificate_credentials_t cred;
138
163
unsigned int dh_bits;
139
164
gnutls_dh_params_t dh_params;
140
165
const char *priority;
167
server *current_server;
169
size_t interfaces_size;
142
170
} mandos_context;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
149
175
sig_atomic_t quit_now = 0;
150
176
int signal_received = 0;
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_start (ap, format);
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
153
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
199
* bytes. "buffer_capacity" is how much is currently allocated,
155
200
* "buffer_length" is how much is already used.
202
__attribute__((nonnull, warn_unused_result))
157
203
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
204
size_t buffer_capacity){
159
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
int old_errno = errno;
164
215
buffer_capacity += BUFFER_SIZE;
166
217
return buffer_capacity;
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
230
*new_server = (server){ .ip = strdup(ip),
232
.if_index = if_index,
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
perror_plus("clock_gettime");
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
170
259
* Initialize GPGME.
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
174
266
gpgme_error_t rc;
175
267
gpgme_engine_info_t engine_info;
179
270
* Helper function to insert pub and seckey to the engine keyring.
181
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
184
275
gpgme_data_t pgp_data;
186
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
192
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
284
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
199
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
200
291
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
206
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
299
perror_plus("close");
210
301
gpgme_data_release(pgp_data);
215
fprintf(stderr, "Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
219
310
gpgme_check_version(NULL);
220
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
312
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
227
/* Set GPGME home directory for the OpenPGP engine only */
318
/* Set GPGME home directory for the OpenPGP engine only */
228
319
rc = gpgme_get_engine_info(&engine_info);
229
320
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
234
325
while(engine_info != NULL){
273
368
ssize_t plaintext_length = 0;
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
279
374
/* Create new GPGME data buffer from memory cryptotext */
280
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
282
377
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
288
383
/* Create new empty GPGME data buffer for the plaintext */
289
384
rc = gpgme_data_new(&dh_plain);
290
385
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
293
389
gpgme_data_release(dh_crypto);
297
393
/* Decrypt data from the cryptotext data buffer to the plaintext
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
396
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
303
399
plaintext_length = -1;
305
401
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
307
403
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
314
410
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
317
413
gpgme_recipient_t recipient;
318
414
recipient = result->recipients;
319
415
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
326
423
recipient = recipient->next;
1019
1175
signal_received = sig;
1020
1176
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1024
1181
errno = old_errno;
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1192
perror_plus("socket");
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1201
perror_plus("ioctl SIOCGIFFLAGS");
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1245
/* Accept this device */
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1028
1253
* This function determines if a directory entry in /sys/class/net
1029
1254
* corresponds to an acceptable network device.
1030
1255
* (This function is passed to scandir(3) as a filter function.)
1257
__attribute__((nonnull, warn_unused_result))
1032
1258
int good_interface(const struct dirent *if_entry){
1034
char *flagname = NULL;
1035
1259
if(if_entry->d_name[0] == '.'){
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1264
if(not get_flags(if_entry->d_name, &ifr)){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1272
if(not good_flags(if_entry->d_name, &ifr)){
1279
* This function determines if a network interface is up.
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1284
if(not get_flags(interface, &ifr)){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1296
* This function determines if a network interface is running
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1301
if(not get_flags(interface, &ifr)){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1331
if((direntry->d_name)[0] == '\0'){
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1352
perror_plus("asprintf");
1356
ret = stat(fullname, &st);
1359
perror_plus("Could not stat hook");
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1391
struct timespec now;
1392
struct timespec waited_time;
1393
intmax_t block_time;
1396
if(mc->current_server == NULL){
1398
fprintf_plus(stderr, "Wait until first server is found."
1401
ret = avahi_simple_poll_iterate(s, -1);
1404
fprintf_plus(stderr, "Check current_server if we should run"
1407
/* the current time */
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1410
perror_plus("clock_gettime");
1413
/* Calculating in ms how long time between now and server
1414
who we visted longest time ago. Now - last seen. */
1415
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1417
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1419
/* total time is 10s/10,000ms.
1420
Converting to s from ms by dividing by 1,000,
1421
and ns to ms by dividing by 1,000,000. */
1422
block_time = ((retry_interval
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1437
avahi_simple_poll_quit(s);
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1443
perror_plus("clock_gettime");
1446
mc->current_server = mc->current_server->next;
1447
block_time = 0; /* Call avahi to find new Mandos
1448
servers, but don't block */
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1454
if(ret > 0 or errno != EINTR){
1455
return (ret != 1) ? ret : 0;
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1468
perror_plus("seteuid");
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1483
if(setuid(0) == -1){
1485
perror_plus("seteuid");
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1498
perror_plus("seteuid");
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1511
perror_plus("setuid");
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1534
#endif /* not O_CLOEXEC */
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1544
#else /* not O_CLOEXEC */
1546
#endif /* not O_CLOEXEC */
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1555
perror_plus("open");
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1569
#endif /* not O_CLOEXEC */
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1582
#endif /* not __GLIBC__ */
1584
perror_plus("scandir");
1587
struct dirent *direntry;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1593
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1596
pid_t hook_pid = fork();
1599
/* Raise privileges */
1600
if(raise_privileges_permanently() != 0){
1601
perror_plus("Failed to raise privileges");
1608
perror_plus("setgid");
1611
/* Reset supplementary groups */
1613
ret = setgroups(0, NULL);
1615
perror_plus("setgroups");
1618
ret = dup2(devnull, STDIN_FILENO);
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1623
ret = close(devnull);
1625
perror_plus("close");
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1635
perror_plus("setenv");
1638
ret = setenv("DEVICE", interface, 1);
1640
perror_plus("setenv");
1643
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1645
perror_plus("setenv");
1648
ret = setenv("MODE", mode, 1);
1650
perror_plus("setenv");
1654
ret = asprintf(&delaystring, "%f", (double)delay);
1656
perror_plus("asprintf");
1659
ret = setenv("DELAY", delaystring, 1);
1662
perror_plus("setenv");
1666
if(connect_to != NULL){
1667
ret = setenv("CONNECT", connect_to, 1);
1669
perror_plus("setenv");
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
1675
perror_plus("fexecve");
1676
_exit(EXIT_FAILURE);
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1681
perror_plus("waitpid");
1684
if(WIFEXITED(status)){
1685
if(WEXITSTATUS(status) != 0){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1687
" with status %d\n", direntry->d_name,
1688
WEXITSTATUS(status));
1691
} else if(WIFSIGNALED(status)){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1693
" signal %d\n", direntry->d_name,
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
1698
" crashed\n", direntry->d_name);
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1708
perror_plus("close");
1715
__attribute__((nonnull, warn_unused_result))
1716
error_t bring_up_interface(const char *const interface,
1718
error_t old_errno = errno;
1720
struct ifreq network;
1721
unsigned int if_index = if_nametoindex(interface);
1723
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1733
if(not interface_is_up(interface)){
1734
error_t ret_errno = 0, ioctl_errno = 0;
1735
if(not get_flags(interface, &network)){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1742
network.ifr_flags |= IFF_UP; /* set flag */
1744
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
perror_plus("socket");
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1755
perror_plus("close");
1762
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1766
/* Raise privileges */
1767
ret_errno = raise_privileges();
1769
perror_plus("Failed to raise privileges");
1774
bool restore_loglevel = false;
1776
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1777
messages about the network interface to mess up the prompt */
1778
ret_linux = klogctl(8, NULL, 5);
1779
if(ret_linux == -1){
1780
perror_plus("klogctl");
1782
restore_loglevel = true;
1785
#endif /* __linux__ */
1786
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1787
ioctl_errno = errno;
1789
if(restore_loglevel){
1790
ret_linux = klogctl(7, NULL, 0);
1791
if(ret_linux == -1){
1792
perror_plus("klogctl");
1795
#endif /* __linux__ */
1797
/* If raise_privileges() succeeded above */
1799
/* Lower privileges */
1800
ret_errno = lower_privileges();
1803
perror_plus("Failed to lower privileges");
1807
/* Close the socket */
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1810
perror_plus("close");
1813
if(ret_setflags == -1){
1814
errno = ioctl_errno;
1815
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1820
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1824
/* Sleep checking until interface is running.
1825
Check every 0.25s, up to total time of delay */
1826
for(int i=0; i < delay * 4; i++){
1827
if(interface_is_running(interface)){
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1117
if(flags & IFF_NOARP){
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1124
/* Accept this device */
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1830
struct timespec sleeptime = { .tv_nsec = 250000000 };
1831
ret = nanosleep(&sleeptime, NULL);
1832
if(ret == -1 and errno != EINTR){
1833
perror_plus("nanosleep");
1841
__attribute__((nonnull, warn_unused_result))
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
1844
struct ifreq network;
1845
unsigned int if_index = if_nametoindex(interface);
1847
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1851
if(interface_is_up(interface)){
1852
error_t ret_errno = 0, ioctl_errno = 0;
1853
if(not get_flags(interface, &network) and debug){
1855
fprintf_plus(stderr, "Failed to get flags for interface "
1856
"\"%s\"\n", interface);
1860
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1862
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1865
perror_plus("socket");
1871
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1875
/* Raise privileges */
1876
ret_errno = raise_privileges();
1878
perror_plus("Failed to raise privileges");
1881
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1882
ioctl_errno = errno;
1884
/* If raise_privileges() succeeded above */
1886
/* Lower privileges */
1887
ret_errno = lower_privileges();
1890
perror_plus("Failed to lower privileges");
1894
/* Close the socket */
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1897
perror_plus("close");
1900
if(ret_setflags == -1){
1901
errno = ioctl_errno;
1902
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1907
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1132
1915
int main(int argc, char *argv[]){
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
1133
1920
AvahiSServiceBrowser *sb = NULL;
1136
1923
intmax_t tmpmax;
1138
1925
int exitcode = EXIT_SUCCESS;
1139
const char *interface = "";
1140
struct ifreq network;
1142
bool take_down_interface = false;
1145
char tempdir[] = "/tmp/mandosXXXXXX";
1146
bool tempdir_created = false;
1926
char *interfaces_to_take_down = NULL;
1927
size_t interfaces_to_take_down_size = 0;
1928
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1929
char old_tempdir[] = "/tmp/mandosXXXXXX";
1930
char *tempdir = NULL;
1147
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1148
1932
const char *seckey = PATHDIR "/" SECKEY;
1149
1933
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1151
1936
bool gnutls_initialized = false;
1152
1937
bool gpgme_initialized = false;
1153
1938
float delay = 2.5f;
1939
double retry_interval = 10; /* 10s between trying a server and
1940
retrying the same server again */
1155
1942
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1156
1943
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1367
2248
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1369
perror("sigaction");
2250
perror_plus("sigaction");
1370
2251
return EX_OSERR;
1372
2253
if(old_sigterm_action.sa_handler != SIG_IGN){
1373
2254
ret = sigaction(SIGINT, &sigterm_action, NULL);
1375
perror("sigaction");
2256
perror_plus("sigaction");
1376
2257
exitcode = EX_OSERR;
1380
2261
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1382
perror("sigaction");
2263
perror_plus("sigaction");
1383
2264
return EX_OSERR;
1385
2266
if(old_sigterm_action.sa_handler != SIG_IGN){
1386
2267
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1388
perror("sigaction");
2269
perror_plus("sigaction");
1389
2270
exitcode = EX_OSERR;
1393
2274
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1395
perror("sigaction");
2276
perror_plus("sigaction");
1396
2277
return EX_OSERR;
1398
2279
if(old_sigterm_action.sa_handler != SIG_IGN){
1399
2280
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1401
perror("sigaction");
1402
exitcode = EX_OSERR;
1407
/* If the interface is down, bring it up */
1408
if(strcmp(interface, "none") != 0){
1409
if_index = (AvahiIfIndex) if_nametoindex(interface);
1411
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1412
exitcode = EX_UNAVAILABLE;
1420
/* Re-raise priviliges */
1428
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1429
messages about the network interface to mess up the prompt */
1430
ret = klogctl(8, NULL, 5);
1431
bool restore_loglevel = true;
1433
restore_loglevel = false;
1436
#endif /* __linux__ */
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1441
exitcode = EX_OSERR;
1443
if(restore_loglevel){
1444
ret = klogctl(7, NULL, 0);
1449
#endif /* __linux__ */
1450
/* Lower privileges */
1458
strcpy(network.ifr_name, interface);
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1461
perror("ioctl SIOCGIFFLAGS");
1463
if(restore_loglevel){
1464
ret = klogctl(7, NULL, 0);
1469
#endif /* __linux__ */
1470
exitcode = EX_OSERR;
1471
/* Lower privileges */
1479
if((network.ifr_flags & IFF_UP) == 0){
1480
network.ifr_flags |= IFF_UP;
1481
take_down_interface = true;
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1484
take_down_interface = false;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1488
if(restore_loglevel){
1489
ret = klogctl(7, NULL, 0);
2282
perror_plus("sigaction");
2283
exitcode = EX_OSERR;
2288
/* If no interfaces were specified, make a list */
2289
if(mc.interfaces == NULL){
2290
struct dirent **direntries;
2291
/* Look for any good interfaces */
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2295
/* Add all found interfaces to interfaces list */
2296
for(int i = 0; i < ret; ++i){
2297
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2298
direntries[i]->d_name);
2301
perror_plus("argz_add");
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2306
direntries[i]->d_name);
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2313
exitcode = EXIT_FAILURE;
2318
/* Bring up interfaces which are down, and remove any "none"s */
2320
char *interface = NULL;
2321
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2323
/* If interface name is "none", stop bringing up interfaces.
2324
Also remove all instances of "none" from the list */
2325
if(strcmp(interface, "none") == 0){
2326
argz_delete(&mc.interfaces, &mc.interfaces_size,
2329
while((interface = argz_next(mc.interfaces,
2330
mc.interfaces_size, interface))){
2331
if(strcmp(interface, "none") == 0){
2332
argz_delete(&mc.interfaces, &mc.interfaces_size,
1494
#endif /* __linux__ */
1495
/* Lower privileges */
1504
/* sleep checking until interface is running */
1505
for(int i=0; i < delay * 4; i++){
1506
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1508
perror("ioctl SIOCGIFFLAGS");
1509
} else if(network.ifr_flags & IFF_RUNNING){
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1513
ret = nanosleep(&sleeptime, NULL);
1514
if(ret == -1 and errno != EINTR){
1515
perror("nanosleep");
1518
if(not take_down_interface){
1519
/* We won't need the socket anymore */
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1526
if(restore_loglevel){
1527
/* Restores kernel loglevel to default */
1528
ret = klogctl(7, NULL, 0);
1533
#endif /* __linux__ */
1534
/* Lower privileges */
1536
if(take_down_interface){
1537
/* Lower privileges */
1543
/* Lower privileges permanently */
2339
bool interface_was_up = interface_is_up(interface);
2340
errno = bring_up_interface(interface, delay);
2341
if(not interface_was_up){
2343
perror_plus("Failed to bring up interface");
2345
errno = argz_add(&interfaces_to_take_down,
2346
&interfaces_to_take_down_size,
2349
perror_plus("argz_add");
2354
if(debug and (interfaces_to_take_down == NULL)){
2355
fprintf_plus(stderr, "No interfaces were brought up\n");
2359
/* If we only got one interface, explicitly use only that one */
2360
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2362
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2365
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1555
ret = init_gnutls_global(pubkey, seckey);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
1557
fprintf(stderr, "init_gnutls_global failed\n");
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
1558
2375
exitcode = EX_UNAVAILABLE;