169
173
/* Function to use when printing errors */
170
174
void perror_plus(const char *print_text){
171
176
fprintf(stderr, "Mandos plugin %s: ",
172
177
program_invocation_short_name);
173
179
perror(print_text);
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_start (ap, format);
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
177
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
194
* bytes. "buffer_capacity" is how much is currently allocated,
179
195
* "buffer_length" is how much is already used.
181
197
size_t incbuffer(char **buffer, size_t buffer_length,
182
size_t buffer_capacity){
198
size_t buffer_capacity){
183
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
184
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
185
201
if(buffer == NULL){
254
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
270
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
262
276
rc = gpgme_op_import(mc.ctx, pgp_data);
263
277
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
284
296
gpgme_check_version(NULL);
285
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
298
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
293
304
/* Set GPGME home directory for the OpenPGP engine only */
294
305
rc = gpgme_get_engine_info(&engine_info);
295
306
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
301
311
while(engine_info != NULL){
342
352
ssize_t plaintext_length = 0;
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
349
358
/* Create new GPGME data buffer from memory cryptotext */
350
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
361
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
359
367
/* Create new empty GPGME data buffer for the plaintext */
360
368
rc = gpgme_data_new(&dh_plain);
361
369
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
365
373
gpgme_data_release(dh_crypto);
371
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
380
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
376
383
plaintext_length = -1;
378
385
gpgme_decrypt_result_t result;
379
386
result = gpgme_op_decrypt_result(mc.ctx);
380
387
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
390
394
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
397
gpgme_recipient_t recipient;
395
398
recipient = result->recipients;
396
399
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
407
recipient = recipient->next;
508
506
/* OpenPGP credentials */
509
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
510
508
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
513
511
gnutls_global_deinit();
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
524
522
ret = gnutls_certificate_set_openpgp_key_file
525
523
(mc.cred, pubkeyfilename, seckeyfilename,
526
524
GNUTLS_OPENPGP_FMT_BASE64);
527
525
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
537
534
/* GnuTLS server initialization */
538
535
ret = gnutls_dh_params_init(&mc.dh_params);
539
536
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
545
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
543
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
744
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
735
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
755
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1044
1029
char ip[AVAHI_ADDRESS_STR_MAX];
1045
1030
avahi_address_snprint(ip, sizeof(ip), address);
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
1052
1036
int ret = start_mandos_communication(ip, port, interface,
1053
1037
avahi_proto_to_af(proto));
1055
1039
avahi_simple_poll_quit(mc.simple_poll);
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1157
1143
/* Reject the loopback device */
1158
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1165
1151
/* Accept point-to-point devices only if connect_to is specified */
1166
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1173
1159
/* Otherwise, reject non-broadcast-capable devices */
1174
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1181
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
1168
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1190
1176
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1289
perror_plus("asprintf");
1293
ret = stat(fullname, &st);
1310
perror_plus("Could not stat plugin");
1296
perror_plus("Could not stat hook");
1314
1300
if(not (S_ISREG(st.st_mode))){
1315
1301
/* Not a regular file */
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1318
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
1309
/* Not executable */
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1395
/* Set effective uid to 0, return errno */
1396
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1415
if(setuid(0) == -1){
1417
perror_plus("seteuid");
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1429
perror_plus("seteuid");
1435
bool run_network_hooks(const char *mode, const char *interface,
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1443
perror_plus("scandir");
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1451
perror_plus("asprintf");
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1458
pid_t hook_pid = fork();
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1467
perror_plus("setgid");
1469
/* Reset supplementary groups */
1471
ret = setgroups(0, NULL);
1473
perror_plus("setgroups");
1475
dup2(devnull, STDIN_FILENO);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1480
perror_plus("setenv");
1483
ret = setenv("DEVICE", interface, 1);
1485
perror_plus("setenv");
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1490
perror_plus("setenv");
1493
ret = setenv("MODE", mode, 1);
1495
perror_plus("setenv");
1499
ret = asprintf(&delaystring, "%f", delay);
1501
perror_plus("asprintf");
1504
ret = setenv("DELAY", delaystring, 1);
1507
perror_plus("setenv");
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1514
perror_plus("setenv");
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1561
int bring_up_interface(const char *const interface,
1564
int old_errno = errno;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1580
/* Re-raise priviliges */
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1592
#endif /* __linux__ */
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
perror_plus("socket");
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1602
perror_plus("klogctl");
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
perror_plus("ioctl SIOCGIFFLAGS");
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1620
perror_plus("klogctl");
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1639
perror_plus("klogctl");
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1649
/* Sleep checking until interface is running.
1650
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1659
ret = nanosleep(&sleeptime, NULL);
1660
if(ret == -1 and errno != EINTR){
1661
perror_plus("nanosleep");
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1667
perror_plus("close");
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1674
perror_plus("klogctl");
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1398
1684
int main(int argc, char *argv[]){
1399
1685
AvahiSServiceBrowser *sb = NULL;
1586
1876
/* Work around Debian bug #633582:
1587
1877
<http://bugs.debian.org/633582> */
1590
1879
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1880
if(raise_privileges() == 0){
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1884
int seckey_fd = open(seckey, O_RDONLY);
1885
if(seckey_fd == -1){
1886
perror_plus("open");
1888
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1890
perror_plus("fstat");
1892
if(S_ISREG(st.st_mode)
1893
and st.st_uid == 0 and st.st_gid == 0){
1894
ret = fchown(seckey_fd, uid, gid);
1896
perror_plus("fchown");
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
int pubkey_fd = open(pubkey, O_RDONLY);
1906
if(pubkey_fd == -1){
1907
perror_plus("open");
1909
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1911
perror_plus("fstat");
1913
if(S_ISREG(st.st_mode)
1914
and st.st_uid == 0 and st.st_gid == 0){
1915
ret = fchown(pubkey_fd, uid, gid);
1917
perror_plus("fchown");
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1925
/* Lower privileges */
1929
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1853
2050
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1867
/* Re-raise priviliges */
1871
perror_plus("seteuid");
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1883
#endif /* __linux__ */
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1893
perror_plus("klogctl");
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1901
perror_plus("seteuid");
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1908
perror_plus("ioctl SIOCGIFFLAGS");
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1913
perror_plus("klogctl");
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1938
perror_plus("klogctl");
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1946
perror_plus("seteuid");
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1970
perror_plus("close");
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1978
perror_plus("klogctl");
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1984
if(take_down_interface){
1985
/* Lower privileges */
1988
perror_plus("seteuid");
1991
/* Lower privileges permanently */
1994
perror_plus("setuid");
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2055
perror_plus("Failed to bring up interface");