159
184
return buffer_capacity;
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
191
server *new_server = malloc(sizeof(server));
192
if(new_server == NULL){
193
perror_plus("malloc");
196
*new_server = (server){ .ip = strdup(ip),
198
.if_index = if_index,
200
if(new_server->ip == NULL){
201
perror_plus("strdup");
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
206
new_server->next = new_server;
207
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
213
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
218
perror_plus("clock_gettime");
163
225
* Initialize GPGME.
165
227
static bool init_gpgme(const char *seckey,
166
228
const char *pubkey, const char *tempdir){
168
229
gpgme_error_t rc;
169
230
gpgme_engine_info_t engine_info;
310
372
gpgme_recipient_t recipient;
311
373
recipient = result->recipients;
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
320
recipient = recipient->next;
374
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
381
recipient = recipient->next;
880
sig_atomic_t quit_now = 0;
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1072
/* Signal handler that stops main loop after sigterm has been called */
1073
static void handle_sigterm(int sig){
1078
signal_received = sig;
888
1079
int old_errno = errno;
1080
/* set main loop to exit */
889
1081
if(mc.simple_poll != NULL){
890
1082
avahi_simple_poll_quit(mc.simple_poll);
892
1084
errno = old_errno;
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1092
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1101
perror_plus("asprintf");
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
perror_plus("open");
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1125
perror_plus("read");
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
/* Accept this device */
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1210
if(mc.current_server == NULL){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1214
ret = avahi_simple_poll_iterate(s, -1);
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1219
/* the current time */
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1222
perror_plus("clock_gettime");
1225
/* Calculating in ms how long time between now and server
1226
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1236
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1242
avahi_simple_poll_quit(mc.simple_poll);
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1247
perror_plus("clock_gettime");
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1257
if (ret > 0 or errno != EINTR) {
1258
return (ret != 1) ? ret : 0;
895
1264
int main(int argc, char *argv[]){
896
1265
AvahiSServiceBrowser *sb = NULL;
952
1343
.arg = "SECONDS",
953
1344
.doc = "Maximum delay to wait for interface startup",
1346
{ .name = "retry", .key = 132,
1348
.doc = "Retry interval used when denied by the mandos server",
1351
* These reproduce what we would get without ARGP_NO_HELP
1353
{ .name = "help", .key = '?',
1354
.doc = "Give this help list", .group = -1 },
1355
{ .name = "usage", .key = -3,
1356
.doc = "Give a short usage message", .group = -1 },
1357
{ .name = "version", .key = 'V',
1358
.doc = "Print program version", .group = -1 },
955
1359
{ .name = NULL }
958
1362
error_t parse_opt(int key, char *arg,
959
1363
struct argp_state *state){
961
1366
case 128: /* --debug */
991
1395
delay = strtof(arg, &tmp);
992
1396
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
1397
argp_error(state, "Bad delay");
1399
case 132: /* --retry */
1401
retry_interval = strtod(arg, &tmp);
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1404
argp_error(state, "Bad retry interval");
1408
* These reproduce what we would get without ARGP_NO_HELP
1410
case '?': /* --help */
1411
argp_state_help(state, state->out_stream,
1412
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1413
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1414
case -3: /* --usage */
1415
argp_state_help(state, state->out_stream,
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1419
exit(argp_err_exit_status);
1002
1422
return ARGP_ERR_UNKNOWN;
1007
1427
struct argp argp = { .options = options, .parser = parse_opt,
1008
1428
.args_doc = "",
1009
1429
.doc = "Mandos client -- Get and decrypt"
1010
1430
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1431
ret = argp_parse(&argp, argc, argv,
1432
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1439
perror_plus("argp_parse");
1440
exitcode = EX_OSERR;
1443
exitcode = EX_USAGE;
1027
1481
mc.simple_poll = avahi_simple_poll_new();
1028
1482
if(mc.simple_poll == NULL){
1029
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1484
exitcode = EX_UNAVAILABLE;
1034
1488
sigemptyset(&sigterm_action.sa_mask);
1035
1489
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1491
perror_plus("sigaddset");
1492
exitcode = EX_OSERR;
1041
1495
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1497
perror_plus("sigaddset");
1498
exitcode = EX_OSERR;
1047
1501
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1503
perror_plus("sigaddset");
1504
exitcode = EX_OSERR;
1507
/* Need to check if the handler is SIG_IGN before handling:
1508
| [[info:libc:Initial Signal Actions]] |
1509
| [[info:libc:Basic Signal Handling]] |
1511
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1513
perror_plus("sigaction");
1516
if(old_sigterm_action.sa_handler != SIG_IGN){
1517
ret = sigaction(SIGINT, &sigterm_action, NULL);
1519
perror_plus("sigaction");
1520
exitcode = EX_OSERR;
1524
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1526
perror_plus("sigaction");
1529
if(old_sigterm_action.sa_handler != SIG_IGN){
1530
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1532
perror_plus("sigaction");
1533
exitcode = EX_OSERR;
1537
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1539
perror_plus("sigaction");
1542
if(old_sigterm_action.sa_handler != SIG_IGN){
1543
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1545
perror_plus("sigaction");
1546
exitcode = EX_OSERR;
1060
1551
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1564
/* Re-raise priviliges */
1568
perror_plus("seteuid");
1062
1571
#ifdef __linux__
1063
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1573
messages about the network interface to mess up the prompt */
1065
1574
ret = klogctl(8, NULL, 5);
1066
1575
bool restore_loglevel = true;
1068
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1071
1580
#endif /* __linux__ */
1073
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1076
exitcode = EXIT_FAILURE;
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1077
1586
#ifdef __linux__
1078
1587
if(restore_loglevel){
1079
1588
ret = klogctl(7, NULL, 0);
1590
perror_plus("klogctl");
1084
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1598
perror_plus("seteuid");
1087
1602
strcpy(network.ifr_name, interface);
1088
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
perror("ioctl SIOCGIFFLAGS");
1605
perror_plus("ioctl SIOCGIFFLAGS");
1091
1606
#ifdef __linux__
1092
1607
if(restore_loglevel){
1093
1608
ret = klogctl(7, NULL, 0);
1610
perror_plus("klogctl");
1098
1613
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1619
perror_plus("seteuid");
1102
1623
if((network.ifr_flags & IFF_UP) == 0){
1103
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1104
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1108
1631
#ifdef __linux__
1109
1632
if(restore_loglevel){
1110
1633
ret = klogctl(7, NULL, 0);
1635
perror_plus("klogctl");
1115
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1643
perror_plus("seteuid");
1119
/* sleep checking until interface is running */
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1120
1649
for(int i=0; i < delay * 4; i++){
1121
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
perror("ioctl SIOCGIFFLAGS");
1652
perror_plus("ioctl SIOCGIFFLAGS");
1124
1653
} else if(network.ifr_flags & IFF_RUNNING){
1127
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
1657
ret = nanosleep(&sleeptime, NULL);
1129
1658
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1659
perror_plus("nanosleep");
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
perror_plus("close");
1137
1669
#ifdef __linux__
1138
1670
if(restore_loglevel){
1139
1671
/* Restores kernel loglevel to default */
1140
1672
ret = klogctl(7, NULL, 0);
1674
perror_plus("klogctl");
1145
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1680
if(take_down_interface){
1681
/* Lower privileges */
1684
perror_plus("seteuid");
1687
/* Lower privileges permanently */
1690
perror_plus("setuid");
1162
1699
ret = init_gnutls_global(pubkey, seckey);
1164
1701
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1702
exitcode = EX_UNAVAILABLE;
1168
1705
gnutls_initialized = true;
1171
1712
if(mkdtemp(tempdir) == NULL){
1713
perror_plus("mkdtemp");
1175
1716
tempdir_created = true;
1177
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
1723
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1724
exitcode = EX_UNAVAILABLE;
1182
1727
gpgme_initialized = true;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1194
1734
if(connect_to != NULL){
1298
1875
if(gpgme_initialized){
1299
1876
gpgme_release(mc.ctx);
1302
/* Removes the temp directory used by GPGME */
1879
/* cleans up the circular linked list of mandos servers the client has seen */
1880
if(mc.current_server != NULL){
1881
mc.current_server->prev->next = NULL;
1882
while(mc.current_server != NULL){
1883
server *next = mc.current_server->next;
1884
free(mc.current_server);
1885
mc.current_server = next;
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1895
perror_plus("seteuid");
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1910
perror_plus("close");
1912
/* Lower privileges permanently */
1916
perror_plus("setuid");
1921
/* Removes the GPGME temp directory and all files inside */
1303
1922
if(tempdir_created){
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1308
if(errno != ENOENT){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1923
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1324
1929
char *fullname = NULL;
1325
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
1931
direntry->d_name);
1933
perror_plus("asprintf");
1331
1936
ret = remove(fullname);