164
152
const char *priority;
166
154
server *current_server;
168
size_t interfaces_size;
169
155
} mandos_context;
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
174
163
sig_atomic_t quit_now = 0;
175
164
int signal_received = 0;
177
166
/* Function to use when printing errors */
178
167
void perror_plus(const char *print_text){
180
168
fprintf(stderr, "Mandos plugin %s: ",
181
169
program_invocation_short_name);
183
170
perror(print_text);
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
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
175
* bytes. "buffer_capacity" is how much is currently allocated,
199
176
* "buffer_length" is how much is already used.
201
178
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
179
size_t buffer_capacity){
203
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
int old_errno = errno;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
185
buffer_capacity += BUFFER_SIZE;
215
187
return buffer_capacity;
218
190
/* 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){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
222
195
server *new_server = malloc(sizeof(server));
223
196
if(new_server == NULL){
224
197
perror_plus("malloc");
227
200
*new_server = (server){ .ip = strdup(ip),
229
.if_index = if_index,
202
.if_index = if_index,
231
204
if(new_server->ip == NULL){
232
205
perror_plus("strdup");
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
237
perror_plus("clock_gettime");
240
208
/* Special case of first server */
241
if(*current_server == NULL){
209
if (mc.current_server == NULL){
242
210
new_server->next = new_server;
243
211
new_server->prev = new_server;
244
*current_server = new_server;
212
mc.current_server = new_server;
245
213
/* Place the new server last in the list */
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
249
217
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
218
mc.current_server->prev = new_server;
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
perror_plus("clock_gettime");
256
229
* Initialize GPGME.
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
260
233
gpgme_error_t rc;
261
234
gpgme_engine_info_t engine_info;
264
238
* Helper function to insert pub and seckey to the engine keyring.
361
332
ssize_t plaintext_length = 0;
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
367
338
/* Create new GPGME data buffer from memory cryptotext */
368
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
370
341
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));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
376
347
/* Create new empty GPGME data buffer for the plaintext */
377
348
rc = gpgme_data_new(&dh_plain);
378
349
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));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
382
352
gpgme_data_release(dh_crypto);
386
356
/* Decrypt data from the cryptotext data buffer to the plaintext
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
359
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
392
362
plaintext_length = -1;
394
364
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
365
result = gpgme_op_decrypt_result(mc.ctx);
396
366
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
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);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
403
373
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
406
376
gpgme_recipient_t recipient;
407
377
recipient = result->recipients;
408
378
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
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
416
385
recipient = recipient->next;
515
484
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
486
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
520
489
gnutls_global_deinit();
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
531
499
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
533
501
GNUTLS_OPENPGP_FMT_BASE64);
534
502
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));
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
543
511
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
512
ret = gnutls_dh_params_init(&mc.dh_params);
545
513
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
519
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
564
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
565
532
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
570
static int init_gnutls_session(gnutls_session_t *session,
537
static int init_gnutls_session(gnutls_session_t *session){
573
539
/* GnuTLS session creation */
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
678
if(if_nametoindex(interface) == (unsigned int)if_index){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
692
fprintf_plus(stderr, "Skipping server on non-used interface"
694
if_indextoname((unsigned int)if_index,
702
ret = init_gnutls_session(&session, mc);
635
ret = init_gnutls_session(&session);
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
712
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
777
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
710
perror_plus("if_indextoname");
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
787
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
789
722
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
730
perror_plus("inet_ntop");
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
1076
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1077
1001
avahi_address_snprint(ip, sizeof(ip), address);
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1085
avahi_proto_to_af(proto),
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1088
avahi_simple_poll_quit(simple_poll);
1010
avahi_simple_poll_quit(mc.simple_poll);
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1168
1079
signal_received = sig;
1169
1080
int old_errno = errno;
1170
1081
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1174
1085
errno = old_errno;
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1184
perror_plus("socket");
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1093
int good_interface(const struct dirent *if_entry){
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1102
perror_plus("asprintf");
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1107
perror_plus("open");
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1126
perror_plus("read");
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1193
perror_plus("ioctl SIOCGIFFLAGS");
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1203
1153
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1211
1161
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1219
1169
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1227
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1236
1185
/* Accept this device */
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1254
if(not get_flags(if_entry->d_name, &ifr)){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1262
if(not good_flags(if_entry->d_name, &ifr)){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1269
* This function determines if a network interface is up.
1271
bool interface_is_up(const char *interface){
1273
if(not get_flags(interface, &ifr)){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1285
* This function determines if a network interface is running
1287
bool interface_is_running(const char *interface){
1289
if(not get_flags(interface, &ifr)){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1300
1193
int notdotentries(const struct dirent *direntry){
1301
1194
/* Skip "." and ".." */
1302
1195
if(direntry->d_name[0] == '.'
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1317
if((direntry->d_name)[0] == '\0'){
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1338
perror_plus("asprintf");
1342
ret = stat(fullname, &st);
1345
perror_plus("Could not stat hook");
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1375
1206
struct timespec now;
1376
1207
struct timespec waited_time;
1377
1208
intmax_t block_time;
1380
if(mc->current_server == NULL){
1211
if(mc.current_server == NULL){
1382
fprintf_plus(stderr, "Wait until first server is found."
1214
"Wait until first server is found. No timeout!\n");
1385
1216
ret = avahi_simple_poll_iterate(s, -1);
1388
fprintf_plus(stderr, "Check current_server if we should run"
1219
fprintf(stderr, "Check current_server if we should run it,"
1391
1222
/* the current time */
1392
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1435
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1438
if (ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1439
1269
return (ret != 1) ? ret : 0;
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1451
perror_plus("seteuid");
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1465
if(setuid(0) == -1){
1467
perror_plus("seteuid");
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1479
perror_plus("seteuid");
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1491
perror_plus("setuid");
1497
bool run_network_hooks(const char *mode, const char *interface,
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1503
if(errno == ENOENT){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1509
perror_plus("scandir");
1512
struct dirent *direntry;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1520
perror_plus("asprintf");
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1527
pid_t hook_pid = fork();
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1536
perror_plus("setgid");
1538
/* Reset supplementary groups */
1540
ret = setgroups(0, NULL);
1542
perror_plus("setgroups");
1544
dup2(devnull, STDIN_FILENO);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1549
perror_plus("setenv");
1552
ret = setenv("DEVICE", interface, 1);
1554
perror_plus("setenv");
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1559
perror_plus("setenv");
1562
ret = setenv("MODE", mode, 1);
1564
perror_plus("setenv");
1568
ret = asprintf(&delaystring, "%f", delay);
1570
perror_plus("asprintf");
1573
ret = setenv("DELAY", delaystring, 1);
1576
perror_plus("setenv");
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1583
perror_plus("setenv");
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1630
error_t bring_up_interface(const char *const interface,
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1656
network.ifr_flags |= IFF_UP;
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1661
perror_plus("socket");
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1677
/* Raise priviliges */
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1699
#endif /* __linux__ */
1701
/* Lower privileges */
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1707
perror_plus("close");
1710
if(ret_setflags == -1){
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1760
perror_plus("socket");
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1770
/* Raise priviliges */
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1776
/* Lower privileges */
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1782
perror_plus("close");
1785
if(ret_setflags == -1){
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1800
1275
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
1276
AvahiSServiceBrowser *sb = NULL;
1808
1279
intmax_t tmpmax;
1810
1281
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1282
const char *interface = "";
1283
struct ifreq network;
1285
bool take_down_interface = false;
1813
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1814
1289
bool tempdir_created = false;
1815
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
1291
const char *seckey = PATHDIR "/" SECKEY;
1817
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1820
1294
bool gnutls_initialized = false;
1821
1295
bool gpgme_initialized = false;
1999
1462
/* Work around Debian bug #633582:
2000
1463
<http://bugs.debian.org/633582> */
2002
1466
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2013
perror_plus("fstat");
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2019
perror_plus("fchown");
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2034
perror_plus("fstat");
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2040
perror_plus("fchown");
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2048
/* Lower privileges */
2053
/* Remove invalid interface names (except "none") */
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2070
/* Run network hooks */
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
1470
perror_plus("seteuid");
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1480
perror_plus("fstat");
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1485
perror_plus("fchown");
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1500
perror_plus("fstat");
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1505
perror_plus("fchown");
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1513
/* Lower privileges */
1517
perror_plus("seteuid");
2088
1522
avahi_set_log_function(empty_log);
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1535
if(interface == NULL){
1536
perror_plus("malloc");
1538
exitcode = EXIT_FAILURE;
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
2091
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
1551
from the signal handler */
2093
1552
/* Initialize the pseudo-RNG for Avahi */
2094
1553
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2099
1557
exitcode = EX_UNAVAILABLE;
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2179
perror_plus("argz_add");
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1637
/* Re-raise priviliges */
1641
perror_plus("seteuid");
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1653
#endif /* __linux__ */
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1663
perror_plus("klogctl");
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1678
perror_plus("ioctl SIOCGIFFLAGS");
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1683
perror_plus("klogctl");
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1692
perror_plus("seteuid");
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1708
perror_plus("klogctl");
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1716
perror_plus("seteuid");
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1740
perror_plus("close");
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1748
perror_plus("klogctl");
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1754
if(take_down_interface){
1755
/* Lower privileges */
1758
perror_plus("seteuid");
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2196
/* Bring up interfaces which are down, and remove any "none"s */
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2222
perror_plus("Failed to bring up interface");
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2229
perror_plus("argz_add");
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
/* Lower privileges permanently */
1764
perror_plus("setuid");
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
1773
ret = init_gnutls_global(pubkey, seckey);
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2255
1776
exitcode = EX_UNAVAILABLE;
2458
/* Re-raise priviliges */
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2466
/* Take down the network interfaces which were brought up */
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2472
ret_errno = take_down_interface(interface);
2475
perror_plus("Failed to take down interface");
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1981
perror_plus("seteuid");
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
1998
/* Lower privileges permanently */
2002
perror_plus("setuid");
2484
lower_privileges_permanently();
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2490
2007
/* Removes the GPGME temp directory and all files inside */
2491
2008
if(tempdir_created){
2492
2009
struct dirent **direntries = NULL;