31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
58
64
#include <assert.h> /* assert() */
59
65
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
74
getuid(), getgid(), setuid(),
68
76
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
76
91
/* All Avahi types, constants and functions
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
890
int old_errno = errno;
891
if(mc.simple_poll != NULL){
892
avahi_simple_poll_quit(mc.simple_poll);
813
897
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
843
{ .name = "interface", .key = 'i',
845
.doc = "Interface that will be used to search for Mandos"
848
{ .name = "seckey", .key = 's',
850
.doc = "OpenPGP secret key file base name",
852
{ .name = "pubkey", .key = 'p',
854
.doc = "OpenPGP public key file base name",
856
{ .name = "dh-bits", .key = 129,
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
861
{ .name = "priority", .key = 130,
863
.doc = "GnuTLS priority string for the TLS handshake",
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
873
case 128: /* --debug */
876
case 'c': /* --connect */
879
case 'i': /* --interface */
882
case 's': /* --seckey */
885
case 'p': /* --pubkey */
888
case 129: /* --dh-bits */
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
898
AvahiSServiceBrowser *sb = NULL;
903
int exitcode = EXIT_SUCCESS;
904
const char *interface = "eth0";
905
struct ifreq network;
907
bool take_down_interface = false;
910
char *connect_to = NULL;
911
char tempdir[] = "/tmp/mandosXXXXXX";
912
bool tempdir_created = false;
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
const char *seckey = PATHDIR "/" SECKEY;
915
const char *pubkey = PATHDIR "/" PUBKEY;
917
bool gnutls_initialized = false;
918
bool gpgme_initialized = false;
921
struct sigaction old_sigterm_action;
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
925
struct argp_option options[] = {
926
{ .name = "debug", .key = 128,
927
.doc = "Debug mode", .group = 3 },
928
{ .name = "connect", .key = 'c',
929
.arg = "ADDRESS:PORT",
930
.doc = "Connect directly to a specific Mandos server",
932
{ .name = "interface", .key = 'i',
934
.doc = "Network interface that will be used to search for"
937
{ .name = "seckey", .key = 's',
939
.doc = "OpenPGP secret key file base name",
941
{ .name = "pubkey", .key = 'p',
943
.doc = "OpenPGP public key file base name",
945
{ .name = "dh-bits", .key = 129,
947
.doc = "Bit length of the prime number used in the"
948
" Diffie-Hellman key exchange",
950
{ .name = "priority", .key = 130,
952
.doc = "GnuTLS priority string for the TLS handshake",
954
{ .name = "delay", .key = 131,
956
.doc = "Maximum delay to wait for interface startup",
961
error_t parse_opt(int key, char *arg,
962
struct argp_state *state){
964
case 128: /* --debug */
967
case 'c': /* --connect */
970
case 'i': /* --interface */
973
case 's': /* --seckey */
976
case 'p': /* --pubkey */
979
case 129: /* --dh-bits */
981
tmpmax = strtoimax(arg, &tmp, 10);
982
if(errno != 0 or tmp == arg or *tmp != '\0'
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
984
fprintf(stderr, "Bad number of DH bits\n");
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
989
case 130: /* --priority */
992
case 131: /* --delay */
994
delay = strtof(arg, &tmp);
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
996
fprintf(stderr, "Bad delay\n");
1005
return ARGP_ERR_UNKNOWN;
1010
struct argp argp = { .options = options, .parser = parse_opt,
1012
.doc = "Mandos client -- Get and decrypt"
1013
" passwords from a Mandos server" };
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
1023
avahi_set_log_function(empty_log);
1026
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1027
from the signal handler */
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1030
mc.simple_poll = avahi_simple_poll_new();
1031
if(mc.simple_poll == NULL){
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
1037
sigemptyset(&sigterm_action.sa_mask);
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
1065
if_index = (AvahiIfIndex) if_nametoindex(interface);
1067
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1082
restore_loglevel = false;
1085
#endif /* __linux__ */
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1090
exitcode = EXIT_FAILURE;
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1098
#endif /* __linux__ */
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1104
perror("ioctl SIOCGIFFLAGS");
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
896
case 130: /* --priority */
904
return ARGP_ERR_UNKNOWN;
909
struct argp argp = { .options = options, .parser = parse_opt,
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
1131
#endif /* __linux__ */
921
/* If the interface is down, bring it up */
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
926
exitcode = EXIT_FAILURE;
929
strcpy(network.ifr_name, interface);
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
930
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
1139
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
945
ret = TEMP_FAILURE_RETRY(close(sd));
1140
} else if(network.ifr_flags & IFF_RUNNING){
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
947
1153
perror("close");
964
ret = init_gnutls_global(&mc, pubkey, seckey);
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
970
gnutls_initalized = true;
973
if(mkdtemp(tempdir) == NULL){
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
984
pgpme_initalized = true;
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1013
exitcode = EXIT_FAILURE;
1015
exitcode = EXIT_SUCCESS;
1021
avahi_set_log_function(empty_log);
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
exitcode = EXIT_FAILURE;
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1074
/* Run the main loop */
1077
fprintf(stderr, "Starting Avahi loop search\n");
1080
avahi_simple_poll_loop(mc.simple_poll);
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1164
#endif /* __linux__ */
1189
ret = init_gnutls_global(pubkey, seckey);
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
1195
gnutls_initialized = true;
1202
tempdir_created = true;
1203
if(mkdtemp(tempdir) == NULL){
1204
tempdir_created = false;
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
1218
gpgme_initialized = true;
1225
if(connect_to != NULL){
1226
/* Connect directly, do not use Zeroconf */
1227
/* (Mainly meant for debugging) */
1228
char *address = strrchr(connect_to, ':');
1229
if(address == NULL){
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
1241
tmpmax = strtoimax(address+1, &tmp, 10);
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
1253
port = (uint16_t)tmpmax;
1255
address = connect_to;
1256
/* Colon in address indicates IPv6 */
1258
if(strchr(address, ':') != NULL){
1268
ret = start_mandos_communication(address, port, if_index, af);
1270
exitcode = EXIT_FAILURE;
1272
exitcode = EXIT_SUCCESS;
1282
AvahiServerConfig config;
1283
/* Do not publish any local Zeroconf records */
1284
avahi_server_config_init(&config);
1285
config.publish_hinfo = 0;
1286
config.publish_addresses = 0;
1287
config.publish_workstation = 0;
1288
config.publish_domain = 0;
1290
/* Allocate a new server */
1291
mc.server = avahi_server_new(avahi_simple_poll_get
1292
(mc.simple_poll), &config, NULL,
1295
/* Free the Avahi configuration data */
1296
avahi_server_config_free(&config);
1299
/* Check if creating the Avahi server object succeeded */
1300
if(mc.server == NULL){
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
1311
/* Create the Avahi service browser */
1312
sb = avahi_s_service_browser_new(mc.server, if_index,
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1314
NULL, 0, browse_callback, NULL);
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
1326
/* Run the main loop */
1329
fprintf(stderr, "Starting Avahi loop search\n");
1332
avahi_simple_poll_loop(mc.simple_poll);
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1088
/* Cleanup things */
1090
avahi_s_service_browser_free(sb);
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1337
fprintf(stderr, "%s exiting\n", argv[0]);
1340
/* Cleanup things */
1342
avahi_s_service_browser_free(sb);
1344
if(mc.server != NULL)
1345
avahi_server_free(mc.server);
1347
if(mc.simple_poll != NULL)
1348
avahi_simple_poll_free(mc.simple_poll);
1350
if(gnutls_initialized){
1351
gnutls_certificate_free_credentials(mc.cred);
1352
gnutls_global_deinit();
1353
gnutls_dh_params_deinit(mc.dh_params);
1356
if(gpgme_initialized){
1357
gpgme_release(mc.ctx);
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1369
perror("ioctl SIOCSIFFLAGS");
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1378
/* Removes the temp directory used by GPGME */
1379
if(tempdir_created){
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1384
if(errno != ENOENT){
1113
1385
perror("opendir");
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1128
ret = unlink(fullname);
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
1407
ret = remove(fullname);
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1416
ret = rmdir(tempdir);
1417
if(ret == -1 and errno != ENOENT){