258
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
193
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
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));
271
199
rc = gpgme_op_import(mc.ctx, pgp_data);
272
200
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
278
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
210
gpgme_data_release(pgp_data);
287
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
291
219
gpgme_check_version(NULL);
292
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
221
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
299
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
300
228
rc = gpgme_get_engine_info(&engine_info);
301
229
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
306
234
while(engine_info != NULL){
374
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
300
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
378
303
plaintext_length = -1;
380
305
gpgme_decrypt_result_t result;
381
306
result = gpgme_op_decrypt_result(mc.ctx);
382
307
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
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);
389
314
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
392
317
gpgme_recipient_t recipient;
393
318
recipient = result->recipients;
394
319
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
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
402
326
recipient = recipient->next;
501
425
/* OpenPGP credentials */
502
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
503
427
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
506
430
gnutls_global_deinit();
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" 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,
517
440
ret = gnutls_certificate_set_openpgp_key_file
518
441
(mc.cred, pubkeyfilename, seckeyfilename,
519
442
GNUTLS_OPENPGP_FMT_BASE64);
520
443
if(ret != GNUTLS_E_SUCCESS){
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
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));
529
452
/* GnuTLS server initialization */
530
453
ret = gnutls_dh_params_init(&mc.dh_params);
531
454
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
537
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
460
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
1102
1016
signal_received = sig;
1103
1017
int old_errno = errno;
1104
/* set main loop to exit */
1105
1018
if(mc.simple_poll != NULL){
1106
1019
avahi_simple_poll_quit(mc.simple_poll);
1108
1021
errno = old_errno;
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
perror_plus("socket");
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1029
int good_interface(const struct dirent *if_entry){
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1132
1089
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1090
if(flags & IFF_LOOPBACK){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1140
1097
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1148
1105
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1106
if(not (flags & IFF_BROADCAST)){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1156
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1114
if(flags & IFF_NOARP){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1165
1121
/* Accept this device */
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1183
if(not get_flags(if_entry->d_name, &ifr)){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1191
if(not good_flags(if_entry->d_name, &ifr)){
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1257
if((direntry->d_name)[0] == '\0'){
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1278
perror_plus("asprintf");
1282
ret = stat(fullname, &st);
1285
perror_plus("Could not stat hook");
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1319
if(mc.current_server == NULL){
1321
fprintf_plus(stderr, "Wait until first server is found."
1324
ret = avahi_simple_poll_iterate(s, -1);
1327
fprintf_plus(stderr, "Check current_server if we should run"
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1333
perror_plus("clock_gettime");
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1360
avahi_simple_poll_quit(mc.simple_poll);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1366
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1392
perror_plus("scandir");
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1400
perror_plus("asprintf");
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
dup2(devnull, STDIN_FILENO);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
perror_plus("setenv");
1442
ret = setenv("DEVICE", interface, 1);
1444
perror_plus("setenv");
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
perror_plus("setenv");
1452
ret = setenv("MODE", mode, 1);
1454
perror_plus("setenv");
1458
ret = asprintf(&delaystring, "%f", delay);
1460
perror_plus("asprintf");
1463
ret = setenv("DELAY", delaystring, 1);
1466
perror_plus("setenv");
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1511
1129
int main(int argc, char *argv[]){
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1710
/* Re-raise priviliges */
1714
perror_plus("seteuid");
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
perror_plus("fstat");
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1731
perror_plus("fchown");
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
perror_plus("fstat");
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1752
perror_plus("fchown");
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1760
/* Lower privileges */
1764
perror_plus("seteuid");
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1775
1302
avahi_set_log_function(empty_log);
1778
1305
if(interface[0] == '\0'){
1779
1306
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1310
/* Pick the first good interface */
1791
1311
interface = strdup(direntries[0]->d_name);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1795
1315
if(interface == NULL){
1796
perror_plus("malloc");
1797
1317
free(direntries);
1798
1318
exitcode = EXIT_FAILURE;
2214
1726
gpgme_release(mc.ctx);
2217
/* Cleans up the circular linked list of Mandos servers the client
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2231
/* Re-raise priviliges */
1729
/* Take down the network interface */
1730
if(take_down_interface){
1731
/* Re-raise priviliges */
2234
1733
ret = seteuid(0);
2236
perror_plus("seteuid");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
2245
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2251
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
perror_plus("close");
1752
/* Lower privileges permanently */
2257
/* Lower privileges permanently */
2261
perror_plus("setuid");
2264
/* Removes the GPGME temp directory and all files inside */
1761
/* Removes the temp directory used by GPGME */
2265
1762
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
1764
struct dirent *direntry;
1765
d = opendir(tempdir);
1767
if(errno != ENOENT){
1772
direntry = readdir(d);
1773
if(direntry == NULL){
1776
/* Skip "." and ".." */
1777
if(direntry->d_name[0] == '.'
1778
and (direntry->d_name[1] == '\0'
1779
or (direntry->d_name[1] == '.'
1780
and direntry->d_name[2] == '\0'))){
2273
1783
char *fullname = NULL;
2274
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
1785
direntry->d_name);
2277
perror_plus("asprintf");
2280
1790
ret = remove(fullname);
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2285
1795
free(fullname);
2289
/* need to clean even if 0 because man page doesn't specify */
2291
if (numentries == -1){
2292
perror_plus("scandir");
2294
1799
ret = rmdir(tempdir);
2295
1800
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");