129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
130
static const char sys_class_net[] = "/sys/class/net";
139
131
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
148
AvahiIfIndex if_index;
150
struct timespec last_seen;
155
133
/* Used for passing in values through the Avahi callback functions */
135
AvahiSimplePoll *simple_poll;
157
136
AvahiServer *server;
158
137
gnutls_certificate_credentials_t cred;
159
138
unsigned int dh_bits;
160
139
gnutls_dh_params_t dh_params;
161
140
const char *priority;
163
server *current_server;
165
size_t interfaces_size;
166
142
} mandos_context;
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
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" };
171
149
sig_atomic_t quit_now = 0;
172
150
int signal_received = 0;
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_start (ap, format);
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
154
* bytes. "buffer_capacity" is how much is currently allocated,
196
155
* "buffer_length" is how much is already used.
198
157
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
158
size_t buffer_capacity){
200
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
int old_errno = errno;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
210
164
buffer_capacity += BUFFER_SIZE;
212
166
return buffer_capacity;
215
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
219
server *new_server = malloc(sizeof(server));
220
if(new_server == NULL){
221
perror_plus("malloc");
224
*new_server = (server){ .ip = strdup(ip),
226
.if_index = if_index,
228
if(new_server->ip == NULL){
229
perror_plus("strdup");
232
/* Special case of first server */
233
if(*current_server == NULL){
234
new_server->next = new_server;
235
new_server->prev = new_server;
236
*current_server = new_server;
237
/* Place the new server last in the list */
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
241
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
246
perror_plus("clock_gettime");
253
170
* Initialize GPGME.
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
257
174
gpgme_error_t rc;
258
175
gpgme_engine_info_t engine_info;
261
179
* Helper function to insert pub and seckey to the engine keyring.
358
273
ssize_t plaintext_length = 0;
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
364
279
/* Create new GPGME data buffer from memory cryptotext */
365
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
367
282
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
373
288
/* Create new empty GPGME data buffer for the plaintext */
374
289
rc = gpgme_data_new(&dh_plain);
375
290
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
379
293
gpgme_data_release(dh_crypto);
383
297
/* Decrypt data from the cryptotext data buffer to the plaintext
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
386
300
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
389
303
plaintext_length = -1;
391
305
gpgme_decrypt_result_t result;
392
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
393
307
if(result == NULL){
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
400
314
if(result->file_name != NULL){
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
403
317
gpgme_recipient_t recipient;
404
318
recipient = result->recipients;
405
319
while(recipient != NULL){
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
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
413
326
recipient = recipient->next;
512
425
/* OpenPGP credentials */
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
514
427
if(ret != GNUTLS_E_SUCCESS){
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
517
430
gnutls_global_deinit();
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
528
440
ret = gnutls_certificate_set_openpgp_key_file
529
(mc->cred, pubkeyfilename, seckeyfilename,
441
(mc.cred, pubkeyfilename, seckeyfilename,
530
442
GNUTLS_OPENPGP_FMT_BASE64);
531
443
if(ret != GNUTLS_E_SUCCESS){
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
540
452
/* GnuTLS server initialization */
541
ret = gnutls_dh_params_init(&mc->dh_params);
453
ret = gnutls_dh_params_init(&mc.dh_params);
542
454
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
549
460
if(ret != GNUTLS_E_SUCCESS){
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
561
gnutls_certificate_free_credentials(mc->cred);
472
gnutls_certificate_free_credentials(mc.cred);
562
473
gnutls_global_deinit();
563
gnutls_dh_params_deinit(mc->dh_params);
474
gnutls_dh_params_deinit(mc.dh_params);
567
static int init_gnutls_session(gnutls_session_t *session,
478
static int init_gnutls_session(gnutls_session_t *session){
570
480
/* GnuTLS session creation */
1164
1016
signal_received = sig;
1165
1017
int old_errno = errno;
1166
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1018
if(mc.simple_poll != NULL){
1019
avahi_simple_poll_quit(mc.simple_poll);
1170
1021
errno = old_errno;
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1180
perror_plus("socket");
1184
strcpy(ifr->ifr_name, ifname);
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1029
int good_interface(const struct dirent *if_entry){
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1189
perror_plus("ioctl SIOCGIFFLAGS");
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1197
bool good_flags(const char *ifname, const struct ifreq *ifr){
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1199
1089
/* Reject the loopback device */
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1090
if(flags & IFF_LOOPBACK){
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1207
1097
/* Accept point-to-point devices only if connect_to is specified */
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1215
1105
/* Otherwise, reject non-broadcast-capable devices */
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1106
if(not (flags & IFF_BROADCAST)){
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1223
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1224
if(ifr->ifr_flags & IFF_NOARP){
1114
if(flags & IFF_NOARP){
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1232
1121
/* Accept this device */
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1240
* This function determines if a directory entry in /sys/class/net
1241
* corresponds to an acceptable network device.
1242
* (This function is passed to scandir(3) as a filter function.)
1244
int good_interface(const struct dirent *if_entry){
1245
if(if_entry->d_name[0] == '.'){
1250
if(not get_flags(if_entry->d_name, &ifr)){
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1258
if(not good_flags(if_entry->d_name, &ifr)){
1265
* This function determines if a network interface is up.
1267
bool interface_is_up(const char *interface){
1269
if(not get_flags(interface, &ifr)){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1281
* This function determines if a network interface is running
1283
bool interface_is_running(const char *interface){
1285
if(not get_flags(interface, &ifr)){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1296
int notdotentries(const struct dirent *direntry){
1297
/* Skip "." and ".." */
1298
if(direntry->d_name[0] == '.'
1299
and (direntry->d_name[1] == '\0'
1300
or (direntry->d_name[1] == '.'
1301
and direntry->d_name[2] == '\0'))){
1307
/* Is this directory entry a runnable program? */
1308
int runnable_hook(const struct dirent *direntry){
1313
if((direntry->d_name)[0] == '\0'){
1318
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
"abcdefghijklmnopqrstuvwxyz"
1322
if((direntry->d_name)[sret] != '\0'){
1323
/* Contains non-allowed characters */
1325
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1334
perror_plus("asprintf");
1338
ret = stat(fullname, &st);
1341
perror_plus("Could not stat hook");
1345
if(not (S_ISREG(st.st_mode))){
1346
/* Not a regular file */
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1354
/* Not executable */
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1371
struct timespec now;
1372
struct timespec waited_time;
1373
intmax_t block_time;
1376
if(mc->current_server == NULL){
1378
fprintf_plus(stderr, "Wait until first server is found."
1381
ret = avahi_simple_poll_iterate(s, -1);
1384
fprintf_plus(stderr, "Check current_server if we should run"
1387
/* the current time */
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1390
perror_plus("clock_gettime");
1393
/* Calculating in ms how long time between now and server
1394
who we visted longest time ago. Now - last seen. */
1395
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1397
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1399
/* total time is 10s/10,000ms.
1400
Converting to s from ms by dividing by 1,000,
1401
and ns to ms by dividing by 1,000,000. */
1402
block_time = ((retry_interval
1403
- ((intmax_t)waited_time.tv_sec * 1000))
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1411
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1417
avahi_simple_poll_quit(s);
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1423
perror_plus("clock_gettime");
1426
mc->current_server = mc->current_server->next;
1427
block_time = 0; /* Call avahi to find new Mandos
1428
servers, but don't block */
1431
ret = avahi_simple_poll_iterate(s, (int)block_time);
1434
if (ret > 0 or errno != EINTR){
1435
return (ret != 1) ? ret : 0;
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1447
perror_plus("seteuid");
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1461
if(setuid(0) == -1){
1463
perror_plus("seteuid");
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1475
perror_plus("seteuid");
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1487
perror_plus("setuid");
1493
bool run_network_hooks(const char *mode, const char *interface,
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1499
if(errno == ENOENT){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1505
perror_plus("scandir");
1508
struct dirent *direntry;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1516
perror_plus("asprintf");
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1523
pid_t hook_pid = fork();
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1532
perror_plus("setgid");
1534
/* Reset supplementary groups */
1536
ret = setgroups(0, NULL);
1538
perror_plus("setgroups");
1540
dup2(devnull, STDIN_FILENO);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1545
perror_plus("setenv");
1548
ret = setenv("DEVICE", interface, 1);
1550
perror_plus("setenv");
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1555
perror_plus("setenv");
1558
ret = setenv("MODE", mode, 1);
1560
perror_plus("setenv");
1564
ret = asprintf(&delaystring, "%f", delay);
1566
perror_plus("asprintf");
1569
ret = setenv("DELAY", delaystring, 1);
1572
perror_plus("setenv");
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1579
perror_plus("setenv");
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1626
error_t bring_up_interface(const char *const interface,
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1652
network.ifr_flags |= IFF_UP;
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1657
perror_plus("socket");
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1673
/* Raise priviliges */
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1695
#endif /* __linux__ */
1697
/* Lower privileges */
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1703
perror_plus("close");
1706
if(ret_setflags == -1){
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1756
perror_plus("socket");
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1766
/* Raise priviliges */
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1772
/* Lower privileges */
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1778
perror_plus("close");
1781
if(ret_setflags == -1){
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1796
1129
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1801
1130
AvahiSServiceBrowser *sb = NULL;
1804
1133
intmax_t tmpmax;
1806
1135
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1136
const char *interface = "";
1137
struct ifreq network;
1139
bool take_down_interface = false;
1809
1142
char tempdir[] = "/tmp/mandosXXXXXX";
1810
1143
bool tempdir_created = false;
1811
1144
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1145
const char *seckey = PATHDIR "/" SECKEY;
1813
1146
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1816
1148
bool gnutls_initialized = false;
1817
1149
bool gpgme_initialized = false;
1818
1150
float delay = 2.5f;
1819
double retry_interval = 10; /* 10s between trying a server and
1820
retrying the same server again */
1822
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1823
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1995
/* Work around Debian bug #633582:
1996
<http://bugs.debian.org/633582> */
1998
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2009
perror_plus("fstat");
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2015
perror_plus("fchown");
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2030
perror_plus("fstat");
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2036
perror_plus("fchown");
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2044
/* Lower privileges */
2049
/* Remove invalid interface names (except "none") */
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2066
/* Run network hooks */
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2084
1302
avahi_set_log_function(empty_log);
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1315
if(interface == NULL){
1318
exitcode = EXIT_FAILURE;
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
2087
1330
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1331
from the signal handler */
2089
1332
/* Initialize the pseudo-RNG for Avahi */
2090
1333
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1334
mc.simple_poll = avahi_simple_poll_new();
1335
if(mc.simple_poll == NULL){
1336
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2095
1337
exitcode = EX_UNAVAILABLE;
2122
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2124
perror_plus("sigaction");
1366
perror("sigaction");
2125
1367
return EX_OSERR;
2127
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
2130
perror_plus("sigaction");
1372
perror("sigaction");
2131
1373
exitcode = EX_OSERR;
2135
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2137
perror_plus("sigaction");
1379
perror("sigaction");
2138
1380
return EX_OSERR;
2140
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2143
perror_plus("sigaction");
1385
perror("sigaction");
2144
1386
exitcode = EX_OSERR;
2148
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2150
perror_plus("sigaction");
1392
perror("sigaction");
2151
1393
return EX_OSERR;
2153
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2156
perror_plus("sigaction");
1398
perror("sigaction");
2157
1399
exitcode = EX_OSERR;
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2175
perror_plus("argz_add");
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
1404
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1409
exitcode = EX_UNAVAILABLE;
1417
/* Re-raise priviliges */
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1427
ret = klogctl(8, NULL, 5);
1428
bool restore_loglevel = true;
1430
restore_loglevel = false;
1433
#endif /* __linux__ */
1435
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1438
exitcode = EX_OSERR;
1440
if(restore_loglevel){
1441
ret = klogctl(7, NULL, 0);
1446
#endif /* __linux__ */
1447
/* Lower privileges */
1455
strcpy(network.ifr_name, interface);
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1458
perror("ioctl SIOCGIFFLAGS");
1460
if(restore_loglevel){
1461
ret = klogctl(7, NULL, 0);
1466
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1476
if((network.ifr_flags & IFF_UP) == 0){
1477
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1485
if(restore_loglevel){
1486
ret = klogctl(7, NULL, 0);
1491
#endif /* __linux__ */
1492
/* Lower privileges */
1501
/* sleep checking until interface is running */
1502
for(int i=0; i < delay * 4; i++){
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1505
perror("ioctl SIOCGIFFLAGS");
1506
} else if(network.ifr_flags & IFF_RUNNING){
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1510
ret = nanosleep(&sleeptime, NULL);
1511
if(ret == -1 and errno != EINTR){
1512
perror("nanosleep");
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1523
if(restore_loglevel){
1524
/* Restores kernel loglevel to default */
1525
ret = klogctl(7, NULL, 0);
1530
#endif /* __linux__ */
1531
/* Lower privileges */
1533
if(take_down_interface){
1534
/* Lower privileges */
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2192
/* Bring up interfaces which are down, and remove any "none"s */
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2218
perror_plus("Failed to bring up interface");
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2225
perror_plus("argz_add");
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1540
/* Lower privileges permanently */
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
1552
ret = init_gnutls_global(pubkey, seckey);
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
1554
fprintf(stderr, "init_gnutls_global failed\n");
2251
1555
exitcode = EX_UNAVAILABLE;