32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
#include <stdbool.h> /* bool, false, true */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
56
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
55
struct in6_addr, inet_pton(),
59
57
#include <fcntl.h> /* open() */
60
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
61
#include <assert.h> /* assert() */
65
62
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
63
#include <time.h> /* time() */
67
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
65
SIOCSIFFLAGS, if_indextoname(),
69
66
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
67
#include <netinet/in.h>
73
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
69
getuid(), getgid(), setuid(),
76
71
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
72
#include <iso646.h> /* not, and, or */
78
73
#include <argp.h> /* struct argp_option, error_t, struct
79
74
argp_state, struct argp,
80
75
argp_parse(), ARGP_KEY_ARG,
81
76
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
91
79
/* All Avahi types, constants and functions
885
/* stop main loop after sigterm has been called */
886
static void handle_sigterm(int sig){
891
signal_received = sig;
892
int old_errno = errno;
893
if(mc.simple_poll != NULL){
894
avahi_simple_poll_quit(mc.simple_poll);
899
820
int main(int argc, char *argv[]){
900
AvahiSServiceBrowser *sb = NULL;
905
int exitcode = EXIT_SUCCESS;
906
const char *interface = "eth0";
907
struct ifreq network;
909
bool take_down_interface = false;
912
char *connect_to = NULL;
913
char tempdir[] = "/tmp/mandosXXXXXX";
914
bool tempdir_created = false;
915
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
916
const char *seckey = PATHDIR "/" SECKEY;
917
const char *pubkey = PATHDIR "/" PUBKEY;
919
bool gnutls_initialized = false;
920
bool gpgme_initialized = false;
923
struct sigaction old_sigterm_action;
924
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
927
struct argp_option options[] = {
928
{ .name = "debug", .key = 128,
929
.doc = "Debug mode", .group = 3 },
930
{ .name = "connect", .key = 'c',
931
.arg = "ADDRESS:PORT",
932
.doc = "Connect directly to a specific Mandos server",
934
{ .name = "interface", .key = 'i',
936
.doc = "Network interface that will be used to search for"
939
{ .name = "seckey", .key = 's',
941
.doc = "OpenPGP secret key file base name",
943
{ .name = "pubkey", .key = 'p',
945
.doc = "OpenPGP public key file base name",
947
{ .name = "dh-bits", .key = 129,
949
.doc = "Bit length of the prime number used in the"
950
" Diffie-Hellman key exchange",
952
{ .name = "priority", .key = 130,
954
.doc = "GnuTLS priority string for the TLS handshake",
956
{ .name = "delay", .key = 131,
958
.doc = "Maximum delay to wait for interface startup",
963
error_t parse_opt(int key, char *arg,
964
struct argp_state *state){
966
case 128: /* --debug */
969
case 'c': /* --connect */
972
case 'i': /* --interface */
975
case 's': /* --seckey */
978
case 'p': /* --pubkey */
981
case 129: /* --dh-bits */
983
tmpmax = strtoimax(arg, &tmp, 10);
984
if(errno != 0 or tmp == arg or *tmp != '\0'
985
or tmpmax != (typeof(mc.dh_bits))tmpmax){
986
fprintf(stderr, "Bad number of DH bits\n");
989
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
991
case 130: /* --priority */
994
case 131: /* --delay */
996
delay = strtof(arg, &tmp);
997
if(errno != 0 or tmp == arg or *tmp != '\0'){
998
fprintf(stderr, "Bad delay\n");
1007
return ARGP_ERR_UNKNOWN;
1012
struct argp argp = { .options = options, .parser = parse_opt,
1014
.doc = "Mandos client -- Get and decrypt"
1015
" passwords from a Mandos server" };
1016
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1017
if(ret == ARGP_ERR_UNKNOWN){
1018
fprintf(stderr, "Unknown error while parsing arguments\n");
1019
exitcode = EXIT_FAILURE;
1025
avahi_set_log_function(empty_log);
1028
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1029
from the signal handler */
1030
/* Initialize the pseudo-RNG for Avahi */
1031
srand((unsigned int) time(NULL));
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL){
1034
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1035
exitcode = EXIT_FAILURE;
1039
sigemptyset(&sigterm_action.sa_mask);
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1052
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1054
perror("sigaddset");
1055
exitcode = EXIT_FAILURE;
1058
ret = sigaction(SIGINT, &sigterm_action, &old_sigterm_action);
1060
perror("sigaction");
1061
exitcode = EXIT_FAILURE;
1064
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1066
perror("sigaction");
1067
exitcode = EXIT_FAILURE;
1070
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1072
perror("sigaction");
1073
exitcode = EXIT_FAILURE;
1077
/* If the interface is down, bring it up */
1078
if(interface[0] != '\0'){
1079
if_index = (AvahiIfIndex) if_nametoindex(interface);
1081
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1082
exitcode = EXIT_FAILURE;
1091
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1092
messages to mess up the prompt */
1093
ret = klogctl(8, NULL, 5);
1094
bool restore_loglevel = true;
1096
restore_loglevel = false;
1099
#endif /* __linux__ */
1101
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1104
exitcode = EXIT_FAILURE;
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1112
#endif /* __linux__ */
1115
strcpy(network.ifr_name, interface);
1116
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
perror("ioctl SIOCGIFFLAGS");
1120
if(restore_loglevel){
1121
ret = klogctl(7, NULL, 0);
1126
#endif /* __linux__ */
1127
exitcode = EXIT_FAILURE;
1130
if((network.ifr_flags & IFF_UP) == 0){
1131
network.ifr_flags |= IFF_UP;
1132
take_down_interface = true;
1133
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1135
take_down_interface = false;
1136
perror("ioctl SIOCSIFFLAGS");
1137
exitcode = EXIT_FAILURE;
1139
if(restore_loglevel){
1140
ret = klogctl(7, NULL, 0);
821
AvahiSServiceBrowser *sb = NULL;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
852
{ .name = "interface", .key = 'i',
854
.doc = "Interface that will be used to search for Mandos"
857
{ .name = "seckey", .key = 's',
859
.doc = "OpenPGP secret key file base name",
861
{ .name = "pubkey", .key = 'p',
863
.doc = "OpenPGP public key file base name",
865
{ .name = "dh-bits", .key = 129,
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
870
{ .name = "priority", .key = 130,
872
.doc = "GnuTLS priority string for the TLS handshake",
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
880
case 128: /* --debug */
883
case 'c': /* --connect */
886
case 'i': /* --interface */
889
case 's': /* --seckey */
892
case 'p': /* --pubkey */
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
904
case 130: /* --priority */
912
return ARGP_ERR_UNKNOWN;
1145
#endif /* __linux__ */
917
struct argp argp = { .options = options, .parser = parse_opt,
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
1149
/* sleep checking until interface is running */
1150
for(int i=0; i < delay * 4; i++){
929
/* If the interface is down, bring it up */
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
934
exitcode = EXIT_FAILURE;
937
strcpy(network.ifr_name, interface);
1151
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1153
940
perror("ioctl SIOCGIFFLAGS");
1154
} else if(network.ifr_flags & IFF_RUNNING){
1157
struct timespec sleeptime = { .tv_nsec = 250000000 };
1158
ret = nanosleep(&sleeptime, NULL);
1159
if(ret == -1 and errno != EINTR){
1160
perror("nanosleep");
1163
if(not take_down_interface){
1164
/* We won't need the socket anymore */
941
exitcode = EXIT_FAILURE;
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
1165
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1167
955
perror("close");
1171
if(restore_loglevel){
1172
/* Restores kernel loglevel to default */
1173
ret = klogctl(7, NULL, 0);
1178
#endif /* __linux__ */
1203
ret = init_gnutls_global(pubkey, seckey);
1205
fprintf(stderr, "init_gnutls_global failed\n");
1206
exitcode = EXIT_FAILURE;
1209
gnutls_initialized = true;
1216
tempdir_created = true;
1217
if(mkdtemp(tempdir) == NULL){
1218
tempdir_created = false;
1227
if(not init_gpgme(pubkey, seckey, tempdir)){
1228
fprintf(stderr, "init_gpgme failed\n");
1229
exitcode = EXIT_FAILURE;
1232
gpgme_initialized = true;
1239
if(connect_to != NULL){
1240
/* Connect directly, do not use Zeroconf */
1241
/* (Mainly meant for debugging) */
1242
char *address = strrchr(connect_to, ':');
1243
if(address == NULL){
1244
fprintf(stderr, "No colon in address\n");
1245
exitcode = EXIT_FAILURE;
1255
tmpmax = strtoimax(address+1, &tmp, 10);
1256
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1257
or tmpmax != (uint16_t)tmpmax){
1258
fprintf(stderr, "Bad port number\n");
1259
exitcode = EXIT_FAILURE;
1267
port = (uint16_t)tmpmax;
1269
address = connect_to;
1270
/* Colon in address indicates IPv6 */
1272
if(strchr(address, ':') != NULL){
1282
ret = start_mandos_communication(address, port, if_index, af);
1284
exitcode = EXIT_FAILURE;
1286
exitcode = EXIT_SUCCESS;
1296
AvahiServerConfig config;
1297
/* Do not publish any local Zeroconf records */
1298
avahi_server_config_init(&config);
1299
config.publish_hinfo = 0;
1300
config.publish_addresses = 0;
1301
config.publish_workstation = 0;
1302
config.publish_domain = 0;
1304
/* Allocate a new server */
1305
mc.server = avahi_server_new(avahi_simple_poll_get
1306
(mc.simple_poll), &config, NULL,
1309
/* Free the Avahi configuration data */
1310
avahi_server_config_free(&config);
1313
/* Check if creating the Avahi server object succeeded */
1314
if(mc.server == NULL){
1315
fprintf(stderr, "Failed to create Avahi server: %s\n",
1316
avahi_strerror(error));
1317
exitcode = EXIT_FAILURE;
1325
/* Create the Avahi service browser */
1326
sb = avahi_s_service_browser_new(mc.server, if_index,
1327
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1328
NULL, 0, browse_callback, NULL);
1330
fprintf(stderr, "Failed to create service browser: %s\n",
1331
avahi_strerror(avahi_server_errno(mc.server)));
1332
exitcode = EXIT_FAILURE;
1340
/* Run the main loop */
1343
fprintf(stderr, "Starting Avahi loop search\n");
1346
avahi_simple_poll_loop(mc.simple_poll);
972
ret = init_gnutls_global(&mc, pubkey, seckey);
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
978
gnutls_initalized = true;
981
if(mkdtemp(tempdir) == NULL){
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
992
gpgme_initalized = true;
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1018
port = (uint16_t)tmpmax;
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1023
exitcode = EXIT_FAILURE;
1025
exitcode = EXIT_SUCCESS;
1031
avahi_set_log_function(empty_log);
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1042
exitcode = EXIT_FAILURE;
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1084
/* Run the main loop */
1087
fprintf(stderr, "Starting Avahi loop search\n");
1090
avahi_simple_poll_loop(mc.simple_poll);
1351
fprintf(stderr, "%s exiting\n", argv[0]);
1354
/* Cleanup things */
1356
avahi_s_service_browser_free(sb);
1358
if(mc.server != NULL)
1359
avahi_server_free(mc.server);
1361
if(mc.simple_poll != NULL)
1362
avahi_simple_poll_free(mc.simple_poll);
1364
if(gnutls_initialized){
1365
gnutls_certificate_free_credentials(mc.cred);
1366
gnutls_global_deinit();
1367
gnutls_dh_params_deinit(mc.dh_params);
1370
if(gpgme_initialized){
1371
gpgme_release(mc.ctx);
1374
/* Take down the network interface */
1375
if(take_down_interface){
1376
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1378
perror("ioctl SIOCGIFFLAGS");
1379
} else if(network.ifr_flags & IFF_UP) {
1380
network.ifr_flags &= ~IFF_UP; /* clear flag */
1381
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1383
perror("ioctl SIOCSIFFLAGS");
1386
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1392
/* Removes the temp directory used by GPGME */
1393
if(tempdir_created){
1395
struct dirent *direntry;
1396
d = opendir(tempdir);
1398
if(errno != ENOENT){
1403
direntry = readdir(d);
1404
if(direntry == NULL){
1407
/* Skip "." and ".." */
1408
if(direntry->d_name[0] == '.'
1409
and (direntry->d_name[1] == '\0'
1410
or (direntry->d_name[1] == '.'
1411
and direntry->d_name[2] == '\0'))){
1414
char *fullname = NULL;
1415
ret = asprintf(&fullname, "%s/%s", tempdir,
1421
ret = remove(fullname);
1423
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1430
ret = rmdir(tempdir);
1431
if(ret == -1 and errno != ENOENT){
1437
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1439
perror("sigaction");
1441
raise(signal_received);
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1098
/* Cleanup things */
1100
avahi_s_service_browser_free(sb);
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1124
if(errno != ENOENT){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1141
ret = unlink(fullname);
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){