132
121
#define PATHDIR "/conf/conf.d/mandos"
133
122
#define SECKEY "seckey.txt"
134
123
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
bool debug = false;
138
126
static const char mandos_protocol_version[] = "1";
139
127
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
151
AvahiIfIndex if_index;
153
struct timespec last_seen;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
158
130
/* Used for passing in values through the Avahi callback functions */
132
AvahiSimplePoll *simple_poll;
160
133
AvahiServer *server;
161
134
gnutls_certificate_credentials_t cred;
162
135
unsigned int dh_bits;
163
136
gnutls_dh_params_t dh_params;
164
137
const char *priority;
166
server *current_server;
168
size_t interfaces_size;
169
139
} mandos_context;
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
141
/* global context so signal handler can reach it*/
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
174
146
sig_atomic_t quit_now = 0;
175
147
int signal_received = 0;
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_start (ap, format);
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
197
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
151
* bytes. "buffer_capacity" is how much is currently allocated,
199
152
* "buffer_length" is how much is already used.
201
154
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
155
size_t buffer_capacity){
203
156
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
int old_errno = errno;
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
161
buffer_capacity += BUFFER_SIZE;
215
163
return buffer_capacity;
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
227
*new_server = (server){ .ip = strdup(ip),
229
.if_index = if_index,
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
237
perror_plus("clock_gettime");
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
256
167
* Initialize GPGME.
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
260
171
gpgme_error_t rc;
261
172
gpgme_engine_info_t engine_info;
264
176
* Helper function to insert pub and seckey to the engine keyring.
361
270
ssize_t plaintext_length = 0;
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
367
276
/* Create new GPGME data buffer from memory cryptotext */
368
277
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
370
279
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
376
285
/* Create new empty GPGME data buffer for the plaintext */
377
286
rc = gpgme_data_new(&dh_plain);
378
287
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
382
290
gpgme_data_release(dh_crypto);
386
294
/* Decrypt data from the cryptotext data buffer to the plaintext
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
297
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
392
300
plaintext_length = -1;
394
302
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
303
result = gpgme_op_decrypt_result(mc.ctx);
396
304
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
403
311
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
fprintf(stderr, "File name: %s\n", result->file_name);
406
314
gpgme_recipient_t recipient;
407
315
recipient = result->recipients;
408
316
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
416
323
recipient = recipient->next;
515
422
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
gnutls_certificate_allocate_credentials(&mc.cred);
517
424
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
safer_gnutls_strerror(ret));
520
430
gnutls_global_deinit();
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" 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,
531
440
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
441
(mc.cred, pubkeyfilename, seckeyfilename,
533
442
GNUTLS_OPENPGP_FMT_BASE64);
534
443
if(ret != GNUTLS_E_SUCCESS){
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
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));
543
452
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
453
ret = gnutls_dh_params_init(&mc.dh_params);
545
454
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
460
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
564
gnutls_certificate_free_credentials(mc->cred);
472
gnutls_certificate_free_credentials(mc.cred);
565
473
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
474
gnutls_dh_params_deinit(mc.dh_params);
570
static int init_gnutls_session(gnutls_session_t *session,
478
static int init_gnutls_session(gnutls_session_t *session){
573
480
/* GnuTLS session creation */
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
568
fprintf(stderr, "Bad address family: %d\n", af);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
675
if(if_nametoindex(interface) == (unsigned int)if_index){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
689
fprintf_plus(stderr, "Skipping server on non-used interface"
691
if_indextoname((unsigned int)if_index,
699
ret = init_gnutls_session(&session, mc);
572
ret = init_gnutls_session(&session);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
709
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
712
perror_plus("socket");
722
592
memset(&to, 0, sizeof(to));
723
593
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
594
to.in6.sin6_family = (sa_family_t)af;
595
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
596
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
597
to.in.sin_family = (sa_family_t)af;
598
ret = inet_pton(af, ip, &to.in.sin_addr);
732
perror_plus("inet_pton");
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
605
fprintf(stderr, "Bad address: %s\n", ip);
742
608
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wunreachable-code */
613
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
746
616
if(if_index == AVAHI_IF_UNSPEC){
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
752
621
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
to.in6.sin6_scope_id = (uint32_t)if_index;
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
625
to.in.sin_port = htons(port); /* Spurious warnings from
627
-Wunreachable-code */
765
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
766
636
char interface[IF_NAMESIZE];
767
637
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
perror_plus("if_indextoname");
638
perror("if_indextoname");
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
777
647
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
648
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
779
650
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
651
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
654
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
660
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
804
670
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
671
ret = connect(tcp_sd, &to.in6, sizeof(to));
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
814
perror_plus("connect");
1162
970
signal_received = sig;
1163
971
int old_errno = errno;
1164
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
perror_plus("socket");
1182
strcpy(ifr->ifr_name, ifname);
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1187
perror_plus("ioctl SIOCGIFFLAGS");
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1197
/* Reject the loopback device */
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1205
/* Accept point-to-point devices only if connect_to is specified */
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1213
/* Otherwise, reject non-broadcast-capable devices */
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
if(ifr->ifr_flags & IFF_NOARP){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1230
/* Accept this device */
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1238
* This function determines if a directory entry in /sys/class/net
1239
* corresponds to an acceptable network device.
1240
* (This function is passed to scandir(3) as a filter function.)
1242
int good_interface(const struct dirent *if_entry){
1243
if(if_entry->d_name[0] == '.'){
1248
if(not get_flags(if_entry->d_name, &ifr)){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1256
if(not good_flags(if_entry->d_name, &ifr)){
1263
* This function determines if a network interface is up.
1265
bool interface_is_up(const char *interface){
1267
if(not get_flags(interface, &ifr)){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1279
* This function determines if a network interface is running
1281
bool interface_is_running(const char *interface){
1283
if(not get_flags(interface, &ifr)){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
int notdotentries(const struct dirent *direntry){
1295
/* Skip "." and ".." */
1296
if(direntry->d_name[0] == '.'
1297
and (direntry->d_name[1] == '\0'
1298
or (direntry->d_name[1] == '.'
1299
and direntry->d_name[2] == '\0'))){
1305
/* Is this directory entry a runnable program? */
1306
int runnable_hook(const struct dirent *direntry){
1311
if((direntry->d_name)[0] == '\0'){
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1332
perror_plus("asprintf");
1336
ret = stat(fullname, &st);
1339
perror_plus("Could not stat hook");
1343
if(not (S_ISREG(st.st_mode))){
1344
/* Not a regular file */
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
/* Not executable */
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1369
struct timespec now;
1370
struct timespec waited_time;
1371
intmax_t block_time;
1374
if(mc->current_server == NULL){
1376
fprintf_plus(stderr, "Wait until first server is found."
1379
ret = avahi_simple_poll_iterate(s, -1);
1382
fprintf_plus(stderr, "Check current_server if we should run"
1385
/* the current time */
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1388
perror_plus("clock_gettime");
1391
/* Calculating in ms how long time between now and server
1392
who we visted longest time ago. Now - last seen. */
1393
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1395
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1397
/* total time is 10s/10,000ms.
1398
Converting to s from ms by dividing by 1,000,
1399
and ns to ms by dividing by 1,000,000. */
1400
block_time = ((retry_interval
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1409
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1415
avahi_simple_poll_quit(s);
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1421
perror_plus("clock_gettime");
1424
mc->current_server = mc->current_server->next;
1425
block_time = 0; /* Call avahi to find new Mandos
1426
servers, but don't block */
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
if (ret > 0 or errno != EINTR){
1433
return (ret != 1) ? ret : 0;
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1445
perror_plus("seteuid");
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1459
if(setuid(0) == -1){
1461
perror_plus("seteuid");
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1473
perror_plus("seteuid");
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1485
perror_plus("setuid");
1491
bool run_network_hooks(const char *mode, const char *interface,
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
if(errno == ENOENT){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1503
perror_plus("scandir");
1506
struct dirent *direntry;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1514
perror_plus("asprintf");
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
pid_t hook_pid = fork();
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1530
perror_plus("setgid");
1532
/* Reset supplementary groups */
1534
ret = setgroups(0, NULL);
1536
perror_plus("setgroups");
1538
dup2(devnull, STDIN_FILENO);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1543
perror_plus("setenv");
1546
ret = setenv("DEVICE", interface, 1);
1548
perror_plus("setenv");
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1553
perror_plus("setenv");
1556
ret = setenv("MODE", mode, 1);
1558
perror_plus("setenv");
1562
ret = asprintf(&delaystring, "%f", delay);
1564
perror_plus("asprintf");
1567
ret = setenv("DELAY", delaystring, 1);
1570
perror_plus("setenv");
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1577
perror_plus("setenv");
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1624
error_t bring_up_interface(const char *const interface,
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1650
network.ifr_flags |= IFF_UP;
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
perror_plus("socket");
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1671
/* Raise priviliges */
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1693
#endif /* __linux__ */
1695
/* Lower privileges */
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1701
perror_plus("close");
1704
if(ret_setflags == -1){
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
perror_plus("socket");
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1764
/* Raise priviliges */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
/* Lower privileges */
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
perror_plus("close");
1779
if(ret_setflags == -1){
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
972
if(mc.simple_poll != NULL){
973
avahi_simple_poll_quit(mc.simple_poll);
1794
978
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
979
AvahiSServiceBrowser *sb = NULL;
1802
982
intmax_t tmpmax;
1804
984
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
985
const char *interface = "eth0";
986
struct ifreq network;
988
bool take_down_interface = false;
991
char *connect_to = NULL;
1807
992
char tempdir[] = "/tmp/mandosXXXXXX";
1808
993
bool tempdir_created = false;
1809
994
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
995
const char *seckey = PATHDIR "/" SECKEY;
1811
996
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1814
998
bool gnutls_initialized = false;
1815
999
bool gpgme_initialized = false;
1816
1000
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1820
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2120
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2122
perror_plus("sigaction");
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2125
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2126
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
2128
perror_plus("sigaction");
2129
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2133
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2135
perror_plus("sigaction");
1204
perror("sigaction");
1205
return EXIT_FAILURE;
2138
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
2139
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2141
perror_plus("sigaction");
2142
exitcode = EX_OSERR;
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
2146
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2148
perror_plus("sigaction");
1217
perror("sigaction");
1218
return EXIT_FAILURE;
2151
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
2152
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2154
perror_plus("sigaction");
2155
exitcode = EX_OSERR;
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2173
perror_plus("argz_add");
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1242
/* Re-raise priviliges */
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages about the network interface to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1255
restore_loglevel = false;
1258
#endif /* __linux__ */
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1263
exitcode = EXIT_FAILURE;
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1283
perror("ioctl SIOCGIFFLAGS");
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1358
if(take_down_interface){
1359
/* Lower privileges */
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2190
/* Bring up interfaces which are down, and remove any "none"s */
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2216
perror_plus("Failed to bring up interface");
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2223
perror_plus("argz_add");
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1365
/* Lower privileges permanently */
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1377
ret = init_gnutls_global(pubkey, seckey);
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
exitcode = EX_UNAVAILABLE;
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2252
1383
gnutls_initialized = true;
2438
1545
gpgme_release(mc.ctx);
2441
/* Cleans up the circular linked list of Mandos servers the client
2443
if(mc.current_server != NULL){
2444
mc.current_server->prev->next = NULL;
2445
while(mc.current_server != NULL){
2446
server *next = mc.current_server->next;
2447
free(mc.current_server);
2448
mc.current_server = next;
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2452
/* Re-raise priviliges */
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2460
/* Take down the network interfaces which were brought up */
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2466
ret_errno = take_down_interface(interface);
2469
perror_plus("Failed to take down interface");
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1564
perror("ioctl SIOCSIFFLAGS");
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1571
/* Lower privileges permanently */
2478
lower_privileges_permanently();
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2484
/* Removes the GPGME temp directory and all files inside */
1580
/* Removes the temp directory used by GPGME */
2485
1581
if(tempdir_created){
2486
struct dirent **direntries = NULL;
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2490
if (numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1586
if(errno != ENOENT){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
2493
1602
char *fullname = NULL;
2494
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
1604
direntry->d_name);
2497
perror_plus("asprintf");
2500
1609
ret = remove(fullname);
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2505
1614
free(fullname);
2509
/* need to clean even if 0 because man page doesn't specify */
2511
if (numentries == -1){
2512
perror_plus("scandir");
2514
1618
ret = rmdir(tempdir);
2515
1619
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");