133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
126
bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
128
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
130
static const char sys_class_net[] = "/sys/class/net";
143
131
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
160
133
/* Used for passing in values through the Avahi callback functions */
135
AvahiSimplePoll *simple_poll;
162
136
AvahiServer *server;
163
137
gnutls_certificate_credentials_t cred;
164
138
unsigned int dh_bits;
165
139
gnutls_dh_params_t dh_params;
166
140
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
142
} mandos_context;
173
/* global so signal handler can reach it*/
174
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" };
176
149
sig_atomic_t quit_now = 0;
177
150
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
154
* bytes. "buffer_capacity" is how much is currently allocated,
201
155
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
157
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
158
size_t buffer_capacity){
206
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
164
buffer_capacity += BUFFER_SIZE;
218
166
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
243
free(new_server->ip);
247
/* Special case of first server */
248
if(*current_server == NULL){
249
new_server->next = new_server;
250
new_server->prev = new_server;
251
*current_server = new_server;
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
256
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
263
170
* Initialize GPGME.
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
270
174
gpgme_error_t rc;
271
175
gpgme_engine_info_t engine_info;
274
179
* Helper function to insert pub and seckey to the engine keyring.
276
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
279
184
gpgme_data_t pgp_data;
281
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
287
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
288
193
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
294
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
295
200
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
301
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
303
perror_plus("close");
305
210
gpgme_data_release(pgp_data);
310
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
314
219
gpgme_check_version(NULL);
315
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
316
221
if(rc != GPG_ERR_NO_ERROR){
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
322
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
323
228
rc = gpgme_get_engine_info(&engine_info);
324
229
if(rc != GPG_ERR_NO_ERROR){
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
329
234
while(engine_info != NULL){
372
273
ssize_t plaintext_length = 0;
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
378
279
/* Create new GPGME data buffer from memory cryptotext */
379
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
381
282
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
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));
387
288
/* Create new empty GPGME data buffer for the plaintext */
388
289
rc = gpgme_data_new(&dh_plain);
389
290
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
393
293
gpgme_data_release(dh_crypto);
397
297
/* Decrypt data from the cryptotext data buffer to the plaintext
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
400
300
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
403
303
plaintext_length = -1;
405
305
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
407
307
if(result == NULL){
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
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);
414
314
if(result->file_name != NULL){
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
417
317
gpgme_recipient_t recipient;
418
318
recipient = result->recipients;
419
319
while(recipient != NULL){
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
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
427
326
recipient = recipient->next;
529
425
/* OpenPGP credentials */
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
531
427
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
432
safer_gnutls_strerror(ret));
534
433
gnutls_global_deinit();
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
545
443
ret = gnutls_certificate_set_openpgp_key_file
546
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
547
445
GNUTLS_OPENPGP_FMT_BASE64);
548
446
if(ret != GNUTLS_E_SUCCESS){
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
557
455
/* GnuTLS server initialization */
558
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
559
457
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
566
463
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
578
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
579
476
gnutls_global_deinit();
580
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
481
static int init_gnutls_session(gnutls_session_t *session){
588
483
/* GnuTLS session creation */
1179
1020
signal_received = sig;
1180
1021
int old_errno = errno;
1181
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1022
if(mc.simple_poll != NULL){
1023
avahi_simple_poll_quit(mc.simple_poll);
1185
1025
errno = old_errno;
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1196
perror_plus("socket");
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1029
* This function determines if a directory entry in /sys/class/net
1030
* corresponds to an acceptable network device.
1031
* (This function is passed to scandir(3) as a filter function.)
1033
int good_interface(const struct dirent *if_entry){
1035
char *flagname = NULL;
1036
if(if_entry->d_name[0] == '.'){
1039
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1045
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1052
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1053
/* read line from flags_fd */
1054
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1055
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1056
flagstring[(size_t)to_read] = '\0';
1057
if(flagstring == NULL){
1063
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1080
tmpmax = strtoimax(flagstring, &tmp, 0);
1081
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1082
and not (isspace(*tmp)))
1083
or tmpmax != (ifreq_flags)tmpmax){
1205
perror_plus("ioctl SIOCGIFFLAGS");
1085
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1086
flagstring, if_entry->d_name);
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1092
ifreq_flags flags = (ifreq_flags)tmpmax;
1216
1093
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1094
if(flags & IFF_LOOPBACK){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1096
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1224
1101
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1102
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1104
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1232
1109
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1110
if(not (flags & IFF_BROADCAST)){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1112
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1240
1117
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1118
if(flags & IFF_NOARP){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1249
1125
/* Accept this device */
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1257
* This function determines if a directory entry in /sys/class/net
1258
* corresponds to an acceptable network device.
1259
* (This function is passed to scandir(3) as a filter function.)
1261
__attribute__((nonnull, warn_unused_result))
1262
int good_interface(const struct dirent *if_entry){
1263
if(if_entry->d_name[0] == '.'){
1268
if(not get_flags(if_entry->d_name, &ifr)){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1276
if(not good_flags(if_entry->d_name, &ifr)){
1127
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1283
* This function determines if a network interface is up.
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1288
if(not get_flags(interface, &ifr)){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1300
* This function determines if a network interface is running
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1305
if(not get_flags(interface, &ifr)){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
1133
int notdotentries(const struct dirent *direntry){
1318
1134
/* Skip "." and ".." */
1319
1135
if(direntry->d_name[0] == '.'
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1335
if((direntry->d_name)[0] == '\0'){
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1356
perror_plus("Could not stat hook");
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1392
if(mc->current_server == NULL){
1394
fprintf_plus(stderr, "Wait until first server is found."
1397
ret = avahi_simple_poll_iterate(s, -1);
1400
fprintf_plus(stderr, "Check current_server if we should run"
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
perror_plus("clock_gettime");
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1433
avahi_simple_poll_quit(s);
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1439
perror_plus("clock_gettime");
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1478
if(setuid(0) == -1){
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1522
perror_plus("open");
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
#endif /* not __GLIBC__ */
1540
perror_plus("scandir");
1543
struct dirent *direntry;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1552
pid_t hook_pid = fork();
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1558
perror_plus("Failed to raise privileges");
1565
perror_plus("setgid");
1568
/* Reset supplementary groups */
1570
ret = setgroups(0, NULL);
1572
perror_plus("setgroups");
1575
ret = dup2(devnull, STDIN_FILENO);
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1580
ret = close(devnull);
1582
perror_plus("close");
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1592
perror_plus("setenv");
1595
ret = setenv("DEVICE", interface, 1);
1597
perror_plus("setenv");
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1602
perror_plus("setenv");
1605
ret = setenv("MODE", mode, 1);
1607
perror_plus("setenv");
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1613
perror_plus("asprintf");
1616
ret = setenv("DELAY", delaystring, 1);
1619
perror_plus("setenv");
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1626
perror_plus("setenv");
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1685
error_t old_errno = errno;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1709
network.ifr_flags |= IFF_UP; /* set flag */
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1714
perror_plus("socket");
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1722
perror_plus("close");
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1737
perror_plus("Failed to raise privileges");
1742
bool restore_loglevel = false;
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1750
restore_loglevel = true;
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1763
#endif /* __linux__ */
1765
/* If raise_privileges() succeeded above */
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1771
perror_plus("Failed to lower privileges");
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1778
perror_plus("close");
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1833
perror_plus("socket");
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1847
perror_plus("Failed to raise privileges");
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1853
/* If raise_privileges() succeeded above */
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1859
perror_plus("Failed to lower privileges");
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1866
perror_plus("close");
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1884
1144
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
1145
AvahiSServiceBrowser *sb = NULL;
1892
1148
intmax_t tmpmax;
1894
1150
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1151
const char *interface = "";
1152
struct ifreq network;
1154
bool take_down_interface = false;
1157
char tempdir[] = "/tmp/mandosXXXXXX";
1158
bool tempdir_created = false;
1900
1159
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
1160
const char *seckey = PATHDIR "/" SECKEY;
1902
1161
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1905
1163
bool gnutls_initialized = false;
1906
1164
bool gpgme_initialized = false;
1907
1165
float delay = 2.5f;
1908
double retry_interval = 10; /* 10s between trying a server and
1909
retrying the same server again */
1911
1167
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1912
1168
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2084
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2091
perror_plus("Failed to raise privileges");
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2102
perror_plus("fstat");
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2108
perror_plus("fchown");
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2123
perror_plus("fstat");
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2129
perror_plus("fchown");
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2141
perror_plus("Failed to lower privileges");
2146
/* Remove invalid interface names (except "none") */
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2163
/* Run network hooks */
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
2179
1317
avahi_set_log_function(empty_log);
1320
if(interface[0] == '\0'){
1321
struct dirent **direntries;
1322
ret = scandir(sys_class_net, &direntries, good_interface,
1325
/* Pick the first good interface */
1326
interface = strdup(direntries[0]->d_name);
1328
fprintf(stderr, "Using interface \"%s\"\n", interface);
1330
if(interface == NULL){
1333
exitcode = EXIT_FAILURE;
1339
fprintf(stderr, "Could not find a network interface\n");
1340
exitcode = EXIT_FAILURE;
2182
1345
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
1346
from the signal handler */
2184
1347
/* Initialize the pseudo-RNG for Avahi */
2185
1348
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
1349
mc.simple_poll = avahi_simple_poll_new();
1350
if(mc.simple_poll == NULL){
1351
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2190
1352
exitcode = EX_UNAVAILABLE;
2217
1379
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2219
perror_plus("sigaction");
1381
perror("sigaction");
2220
1382
return EX_OSERR;
2222
1384
if(old_sigterm_action.sa_handler != SIG_IGN){
2223
1385
ret = sigaction(SIGINT, &sigterm_action, NULL);
2225
perror_plus("sigaction");
1387
perror("sigaction");
2226
1388
exitcode = EX_OSERR;
2230
1392
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2232
perror_plus("sigaction");
1394
perror("sigaction");
2233
1395
return EX_OSERR;
2235
1397
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
1398
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2238
perror_plus("sigaction");
1400
perror("sigaction");
2239
1401
exitcode = EX_OSERR;
2243
1405
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2245
perror_plus("sigaction");
1407
perror("sigaction");
2246
1408
return EX_OSERR;
2248
1410
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
1411
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2251
perror_plus("sigaction");
1413
perror("sigaction");
2252
1414
exitcode = EX_OSERR;
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2270
perror_plus("argz_add");
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
1419
/* If the interface is down, bring it up */
1420
if(strcmp(interface, "none") != 0){
1421
if_index = (AvahiIfIndex) if_nametoindex(interface);
1423
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1424
exitcode = EX_UNAVAILABLE;
1432
/* Re-raise priviliges */
1440
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1441
messages about the network interface to mess up the prompt */
1442
ret = klogctl(8, NULL, 5);
1443
bool restore_loglevel = true;
1445
restore_loglevel = false;
1448
#endif /* __linux__ */
1450
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1453
exitcode = EX_OSERR;
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1461
#endif /* __linux__ */
1462
/* Lower privileges */
1470
strcpy(network.ifr_name, interface);
1471
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1473
perror("ioctl SIOCGIFFLAGS");
1475
if(restore_loglevel){
1476
ret = klogctl(7, NULL, 0);
1481
#endif /* __linux__ */
1482
exitcode = EX_OSERR;
1483
/* Lower privileges */
1491
if((network.ifr_flags & IFF_UP) == 0){
1492
network.ifr_flags |= IFF_UP;
1493
take_down_interface = true;
1494
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1496
take_down_interface = false;
1497
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1498
exitcode = EX_OSERR;
1500
if(restore_loglevel){
1501
ret = klogctl(7, NULL, 0);
1506
#endif /* __linux__ */
1507
/* Lower privileges */
1516
/* sleep checking until interface is running */
1517
for(int i=0; i < delay * 4; i++){
1518
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1520
perror("ioctl SIOCGIFFLAGS");
1521
} else if(network.ifr_flags & IFF_RUNNING){
1524
struct timespec sleeptime = { .tv_nsec = 250000000 };
1525
ret = nanosleep(&sleeptime, NULL);
1526
if(ret == -1 and errno != EINTR){
1527
perror("nanosleep");
1530
if(not take_down_interface){
1531
/* We won't need the socket anymore */
1532
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1538
if(restore_loglevel){
1539
/* Restores kernel loglevel to default */
1540
ret = klogctl(7, NULL, 0);
1545
#endif /* __linux__ */
1546
/* Lower privileges */
1548
if(take_down_interface){
1549
/* Lower privileges */
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2289
/* Bring up interfaces which are down, and remove any "none"s */
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2314
perror_plus("Failed to bring up interface");
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2320
perror_plus("argz_add");
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1555
/* Lower privileges permanently */
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1567
ret = init_gnutls_global(pubkey, seckey);
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
1569
fprintf(stderr, "init_gnutls_global failed\n");
2346
1570
exitcode = EX_UNAVAILABLE;
2543
1740
gpgme_release(mc.ctx);
2546
/* Cleans up the circular linked list of Mandos servers the client
2548
if(mc.current_server != NULL){
2549
mc.current_server->prev->next = NULL;
2550
while(mc.current_server != NULL){
2551
server *next = mc.current_server->next;
2552
free(mc.current_server);
2553
mc.current_server = next;
2557
/* Re-raise privileges */
2559
ret_errno = raise_privileges();
2562
perror_plus("Failed to raise privileges");
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2569
/* Take down the network interfaces which were brought up */
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2575
ret_errno = take_down_interface(interface);
2578
perror_plus("Failed to take down interface");
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2588
ret_errno = lower_privileges_permanently();
2591
perror_plus("Failed to lower privileges permanently");
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
1743
/* Take down the network interface */
1744
if(take_down_interface){
1745
/* Re-raise priviliges */
1752
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1754
perror("ioctl SIOCGIFFLAGS");
1755
} else if(network.ifr_flags & IFF_UP) {
1756
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1759
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1762
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1766
/* Lower privileges permanently */
2598
1775
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
1776
if(tempdir_created){
2600
1777
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2628
/* need to clean even if 0 because man page doesn't specify */
2630
if(numentries == -1){
2631
perror_plus("scandir");
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
1778
struct dirent *direntry = NULL;
1779
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1781
for(int i = 0; i < ret; i++){
1782
direntry = direntries[i];
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1790
ret = remove(fullname);
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
1799
/* need to be cleaned even if ret == 0 because man page dont specify */
1804
ret = rmdir(tempdir);
1805
if(ret == -1 and errno != ENOENT){