156
165
const char *priority;
158
167
server *current_server;
169
size_t interfaces_size;
159
170
} 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 };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
167
175
sig_atomic_t quit_now = 0;
168
176
int signal_received = 0;
170
178
/* Function to use when printing errors */
171
179
void perror_plus(const char *print_text){
172
181
fprintf(stderr, "Mandos plugin %s: ",
173
182
program_invocation_short_name);
174
184
perror(print_text);
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));
178
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
199
* bytes. "buffer_capacity" is how much is currently allocated,
180
200
* "buffer_length" is how much is already used.
202
__attribute__((nonnull, warn_unused_result))
182
203
size_t incbuffer(char **buffer, size_t buffer_length,
183
204
size_t buffer_capacity){
184
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
int old_errno = errno;
189
215
buffer_capacity += BUFFER_SIZE;
191
217
return buffer_capacity;
194
220
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
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){
198
225
server *new_server = malloc(sizeof(server));
199
226
if(new_server == NULL){
200
227
perror_plus("malloc");
203
230
*new_server = (server){ .ip = strdup(ip),
342
368
ssize_t plaintext_length = 0;
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
349
374
/* Create new GPGME data buffer from memory cryptotext */
350
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
377
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));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
359
383
/* Create new empty GPGME data buffer for the plaintext */
360
384
rc = gpgme_data_new(&dh_plain);
361
385
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));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
365
389
gpgme_data_release(dh_crypto);
369
393
/* Decrypt data from the cryptotext data buffer to the plaintext
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
396
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));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
376
399
plaintext_length = -1;
378
401
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
380
403
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
404
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);
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);
390
410
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
413
gpgme_recipient_t recipient;
395
414
recipient = result->recipients;
396
415
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
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
406
423
recipient = recipient->next;
508
525
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
527
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
513
530
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,
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
524
541
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
526
543
GNUTLS_OPENPGP_FMT_BASE64);
527
544
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));
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
537
553
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
539
555
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));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
562
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));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
560
575
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
565
static int init_gnutls_session(gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
567
584
/* GnuTLS session creation */
744
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
780
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
755
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
791
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
766
perror_plus("inet_ntop");
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1126
1175
signal_received = sig;
1127
1176
int old_errno = errno;
1128
1177
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1132
1181
errno = old_errno;
1184
__attribute__((nonnull, warn_unused_result))
1135
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
1192
perror_plus("socket");
1143
1196
strcpy(ifr->ifr_name, ifname);
1144
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1201
perror_plus("ioctl SIOCGIFFLAGS");
1209
__attribute__((nonnull, warn_unused_result))
1154
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1212
/* Reject the loopback device */
1157
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1164
1220
/* Accept point-to-point devices only if connect_to is specified */
1165
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1172
1228
/* Otherwise, reject non-broadcast-capable devices */
1173
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1180
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1237
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1189
1245
/* Accept this device */
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1207
1263
struct ifreq ifr;
1208
1264
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1217
if(not good_flags(if_entry->d_name, &ifr)){
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1234
if(not get_flags(if_entry->d_name, &ifr)){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1263
if(not good_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))
1269
1313
int notdotentries(const struct dirent *direntry){
1270
1314
/* Skip "." and ".." */
1271
1315
if(direntry->d_name[0] == '.'
1403
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1406
if (ret > 0 or errno != EINTR){
1446
if(ret > 0 or errno != EINTR){
1407
1447
return (ret != 1) ? ret : 0;
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1460
perror_plus("seteuid");
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1475
if(setuid(0) == -1){
1477
perror_plus("seteuid");
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1490
perror_plus("seteuid");
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1503
perror_plus("setuid");
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1526
#endif /* not O_CLOEXEC */
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1536
#else /* not O_CLOEXEC */
1538
#endif /* not O_CLOEXEC */
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1547
perror_plus("open");
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1561
#endif /* not O_CLOEXEC */
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
#endif /* not __GLIBC__ */
1576
perror_plus("scandir");
1579
struct dirent *direntry;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1588
pid_t hook_pid = fork();
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1600
perror_plus("setgid");
1603
/* Reset supplementary groups */
1605
ret = setgroups(0, NULL);
1607
perror_plus("setgroups");
1610
ret = dup2(devnull, STDIN_FILENO);
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1615
ret = close(devnull);
1617
perror_plus("close");
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
perror_plus("setenv");
1630
ret = setenv("DEVICE", interface, 1);
1632
perror_plus("setenv");
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1637
perror_plus("setenv");
1640
ret = setenv("MODE", mode, 1);
1642
perror_plus("setenv");
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1648
perror_plus("asprintf");
1651
ret = setenv("DELAY", delaystring, 1);
1654
perror_plus("setenv");
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1661
perror_plus("setenv");
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1710
error_t old_errno = errno;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1734
network.ifr_flags |= IFF_UP; /* set flag */
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1739
perror_plus("socket");
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
perror_plus("close");
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1761
perror_plus("Failed to raise privileges");
1766
bool restore_loglevel = false;
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1774
restore_loglevel = true;
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1787
#endif /* __linux__ */
1789
/* If raise_privileges() succeeded above */
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1795
perror_plus("Failed to lower privileges");
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1802
perror_plus("close");
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1857
perror_plus("socket");
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1870
perror_plus("Failed to raise privileges");
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1876
/* If raise_privileges() succeeded above */
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1882
perror_plus("Failed to lower privileges");
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1889
perror_plus("close");
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1413
1907
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1414
1912
AvahiSServiceBrowser *sb = NULL;
1417
1915
intmax_t tmpmax;
1419
1917
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1423
bool take_down_interface = false;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1428
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1924
const char *seckey = PATHDIR "/" SECKEY;
1430
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1432
1928
bool gnutls_initialized = false;
1433
1929
bool gpgme_initialized = false;
1608
2107
/* Work around Debian bug #633582:
1609
2108
<http://bugs.debian.org/633582> */
1612
/* Re-raise priviliges */
1616
perror_plus("seteuid");
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1626
perror_plus("fstat");
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1631
perror_plus("fchown");
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1646
perror_plus("fstat");
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1651
perror_plus("fchown");
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1659
/* Lower privileges */
1663
perror_plus("seteuid");
1667
/* Find network hooks and run them */
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1674
perror_plus("scandir");
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2114
perror_plus("Failed to raise privileges");
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1682
perror_plus("asprintf");
1685
pid_t hook_pid = fork();
1688
dup2(devnull, STDIN_FILENO);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1693
perror_plus("setenv");
1696
ret = setenv("DEVICE", interface, 1);
1698
perror_plus("setenv");
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1703
perror_plus("setenv");
1706
ret = setenv("MODE", "start", 1);
1708
perror_plus("setenv");
1712
ret = asprintf(&delaystring, "%f", delay);
1714
perror_plus("asprintf");
1717
ret = setenv("DELAY", delaystring, 1);
1720
perror_plus("setenv");
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2125
perror_plus("fstat");
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2131
perror_plus("fchown");
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2146
perror_plus("fstat");
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2152
perror_plus("fchown");
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2164
perror_plus("Failed to lower privileges");
2169
/* Remove invalid interface names (except "none") */
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2186
/* Run network hooks */
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
1767
2202
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1788
if(interface == NULL){
1789
perror_plus("malloc");
1791
exitcode = EXIT_FAILURE;
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1804
2205
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2206
from the signal handler */
1806
2207
/* Initialize the pseudo-RNG for Avahi */
1807
2208
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
1812
2213
exitcode = EX_UNAVAILABLE;
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1893
/* Re-raise priviliges */
1897
perror_plus("seteuid");
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1909
#endif /* __linux__ */
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1919
perror_plus("klogctl");
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1927
perror_plus("seteuid");
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1934
perror_plus("ioctl SIOCGIFFLAGS");
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1939
perror_plus("klogctl");
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1948
perror_plus("seteuid");
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1964
perror_plus("klogctl");
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2293
perror_plus("argz_add");
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2310
/* Bring up interfaces which are down, and remove any "none"s */
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1972
perror_plus("seteuid");
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2004
perror_plus("klogctl");
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2010
if(take_down_interface){
2011
/* Lower privileges */
2014
perror_plus("seteuid");
2017
/* Lower privileges permanently */
2020
perror_plus("setuid");
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2335
perror_plus("Failed to bring up interface");
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2341
perror_plus("argz_add");
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2029
ret = init_gnutls_global(pubkey, seckey);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2367
exitcode = EX_UNAVAILABLE;
2240
/* XXX run network hooks "stop" here */
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2248
perror_plus("seteuid");
2578
/* Re-raise privileges */
2580
ret_errno = raise_privileges();
2582
perror_plus("Failed to raise privileges");
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2589
/* Take down the network interfaces which were brought up */
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2595
ret_errno = take_down_interface(interface);
2598
perror_plus("Failed to take down interface");
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2263
perror_plus("close");
2265
/* Lower privileges permanently */
2269
perror_plus("setuid");
2608
ret_errno = lower_privileges_permanently();
2610
perror_plus("Failed to lower privileges permanently");
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2274
2617
/* Removes the GPGME temp directory and all files inside */
2275
if(tempdir_created){
2618
if(tempdir != NULL){
2276
2619
struct dirent **direntries = NULL;
2277
2620
struct dirent *direntry = NULL;
2278
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2280
if (numentries > 0){
2281
2624
for(int i = 0; i < numentries; i++){
2282
2625
direntry = direntries[i];
2283
2626
char *fullname = NULL;