35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
39
41
#include <stdint.h> /* uint16_t, uint32_t */
40
42
#include <stddef.h> /* NULL, size_t, ssize_t */
41
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
45
#include <stdbool.h> /* bool, false, true */
44
46
#include <string.h> /* memset(), strcmp(), strlen(),
45
47
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
SOCK_STREAM, uid_t, gid_t, open(),
51
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
55
inet_pton(), connect() */
55
56
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
58
60
#include <assert.h> /* assert() */
59
61
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
62
#include <time.h> /* nanosleep(), time() */
61
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
64
SIOCSIFFLAGS, if_indextoname(),
63
65
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
65
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
70
getuid(), getgid(), setuid(),
68
72
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, or, and */
70
74
#include <argp.h> /* struct argp_option, error_t, struct
71
75
argp_state, struct argp,
72
76
argp_parse(), ARGP_KEY_ARG,
73
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
80
#include <sys/klog.h> /* klogctl() */
76
84
/* All Avahi types, constants and functions
432
443
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
444
ret = gnutls_dh_params_init(&mc.dh_params);
445
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
452
gnutls_certificate_free_credentials(mc->cred);
463
gnutls_certificate_free_credentials(mc.cred);
453
464
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
469
static int init_gnutls_session(gnutls_session_t *session){
460
471
/* GnuTLS session creation */
461
472
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
473
if(ret != GNUTLS_E_SUCCESS){
463
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
475
safer_gnutls_strerror(ret));
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
471
482
fprintf(stderr, "Syntax error at: %s\n", err);
472
483
fprintf(stderr, "GnuTLS error: %s\n",
473
484
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
485
gnutls_deinit(*session);
479
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
if (ret != GNUTLS_E_SUCCESS) {
492
if(ret != GNUTLS_E_SUCCESS){
482
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
494
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
495
gnutls_deinit(*session);
488
499
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
500
gnutls_certificate_server_set_request(*session,
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
874
/* stop main loop after sigterm has been called */
875
static void handle_sigterm(__attribute__((unused)) int sig){
876
int old_errno = errno;
877
avahi_simple_poll_quit(mc.simple_poll);
813
881
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);
882
AvahiSServiceBrowser *sb = NULL;
887
int exitcode = EXIT_SUCCESS;
888
const char *interface = "eth0";
889
struct ifreq network;
893
char *connect_to = NULL;
894
char tempdir[] = "/tmp/mandosXXXXXX";
895
bool tempdir_created = false;
896
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
897
const char *seckey = PATHDIR "/" SECKEY;
898
const char *pubkey = PATHDIR "/" PUBKEY;
900
bool gnutls_initialized = false;
901
bool gpgme_initialized = false;
904
struct sigaction old_sigterm_action;
905
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
908
struct argp_option options[] = {
909
{ .name = "debug", .key = 128,
910
.doc = "Debug mode", .group = 3 },
911
{ .name = "connect", .key = 'c',
912
.arg = "ADDRESS:PORT",
913
.doc = "Connect directly to a specific Mandos server",
915
{ .name = "interface", .key = 'i',
917
.doc = "Network interface that will be used to search for"
920
{ .name = "seckey", .key = 's',
922
.doc = "OpenPGP secret key file base name",
924
{ .name = "pubkey", .key = 'p',
926
.doc = "OpenPGP public key file base name",
928
{ .name = "dh-bits", .key = 129,
930
.doc = "Bit length of the prime number used in the"
931
" Diffie-Hellman key exchange",
933
{ .name = "priority", .key = 130,
935
.doc = "GnuTLS priority string for the TLS handshake",
937
{ .name = "delay", .key = 131,
939
.doc = "Maximum delay to wait for interface startup",
944
error_t parse_opt(int key, char *arg,
945
struct argp_state *state){
947
case 128: /* --debug */
950
case 'c': /* --connect */
953
case 'i': /* --interface */
956
case 's': /* --seckey */
959
case 'p': /* --pubkey */
962
case 129: /* --dh-bits */
963
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
964
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
965
or arg[numchars] != '\0'){
966
fprintf(stderr, "Bad number of DH bits\n");
969
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
971
case 130: /* --priority */
974
case 131: /* --delay */
975
ret = sscanf(arg, "%lf%n", &delay, &numchars);
976
if(ret < 1 or arg[numchars] != '\0'){
977
fprintf(stderr, "Bad delay\n");
986
return ARGP_ERR_UNKNOWN;
991
struct argp argp = { .options = options, .parser = parse_opt,
993
.doc = "Mandos client -- Get and decrypt"
994
" passwords from a Mandos server" };
995
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
996
if(ret == ARGP_ERR_UNKNOWN){
997
fprintf(stderr, "Unknown error while parsing arguments\n");
998
exitcode = EXIT_FAILURE;
1004
avahi_set_log_function(empty_log);
1007
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1008
from the signal handler */
1009
/* Initialize the pseudo-RNG for Avahi */
1010
srand((unsigned int) time(NULL));
1011
mc.simple_poll = avahi_simple_poll_new();
1012
if(mc.simple_poll == NULL){
1013
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1014
exitcode = EXIT_FAILURE;
1018
sigemptyset(&sigterm_action.sa_mask);
1019
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1021
perror("sigaddset");
1022
exitcode = EXIT_FAILURE;
1025
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1027
perror("sigaction");
1028
exitcode = EXIT_FAILURE;
1033
/* If the interface is down, bring it up */
1034
if(interface[0] != '\0'){
1036
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1037
messages to mess up the prompt */
1038
ret = klogctl(8, NULL, 5);
1039
bool restore_loglevel = true;
1041
restore_loglevel = false;
1046
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1049
exitcode = EXIT_FAILURE;
1051
if(restore_loglevel){
1052
ret = klogctl(7, NULL, 0);
1060
strcpy(network.ifr_name, interface);
1061
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1063
perror("ioctl SIOCGIFFLAGS");
1065
if(restore_loglevel){
1066
ret = klogctl(7, NULL, 0);
1072
exitcode = EXIT_FAILURE;
1075
if((network.ifr_flags & IFF_UP) == 0){
1076
network.ifr_flags |= IFF_UP;
1077
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1079
perror("ioctl SIOCSIFFLAGS");
1080
exitcode = EXIT_FAILURE;
1082
if(restore_loglevel){
1083
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;
921
ret = init_gnutls_global(&mc, pubkey, seckey);
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
927
gnutls_initalized = true;
930
if(mkdtemp(tempdir) == NULL){
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
941
pgpme_initalized = true;
944
/* If the interface is down, bring it up */
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
949
exitcode = EXIT_FAILURE;
952
strcpy(network.ifr_name, interface);
1092
/* sleep checking until interface is running */
1093
for(int i=0; i < delay * 4; i++){
953
1094
ret = ioctl(sd, SIOCGIFFLAGS, &network);
955
1096
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
968
ret = TEMP_FAILURE_RETRY(close(sd));
1097
} else if(network.ifr_flags & IFF_RUNNING){
1100
struct timespec sleeptime = { .tv_nsec = 250000000 };
1101
ret = nanosleep(&sleeptime, NULL);
1102
if(ret == -1 and errno != EINTR){
1103
perror("nanosleep");
1106
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1111
if(restore_loglevel){
1112
/* Restores kernel loglevel to default */
1113
ret = klogctl(7, NULL, 0);
1135
ret = init_gnutls_global(pubkey, seckey);
1137
fprintf(stderr, "init_gnutls_global failed\n");
1138
exitcode = EXIT_FAILURE;
1141
gnutls_initialized = true;
1144
if(mkdtemp(tempdir) == NULL){
1148
tempdir_created = true;
1150
if(not init_gpgme(pubkey, seckey, tempdir)){
1151
fprintf(stderr, "init_gpgme failed\n");
1152
exitcode = EXIT_FAILURE;
1155
gpgme_initialized = true;
1158
if(interface[0] != '\0'){
987
1159
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1160
if(if_index == 0){
989
1161
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);
1162
exitcode = EXIT_FAILURE;
1167
if(connect_to != NULL){
1168
/* Connect directly, do not use Zeroconf */
1169
/* (Mainly meant for debugging) */
1170
char *address = strrchr(connect_to, ':');
1171
if(address == NULL){
1172
fprintf(stderr, "No colon in address\n");
1173
exitcode = EXIT_FAILURE;
1177
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1178
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1179
or address[numchars+1] != '\0'){
1180
fprintf(stderr, "Bad port number\n");
1181
exitcode = EXIT_FAILURE;
1184
port = (uint16_t)tmpmax;
1186
address = connect_to;
1187
/* Colon in address indicates IPv6 */
1189
if(strchr(address, ':') != NULL){
1194
ret = start_mandos_communication(address, port, if_index,
1197
exitcode = EXIT_FAILURE;
1199
exitcode = EXIT_SUCCESS;
1205
AvahiServerConfig config;
1206
/* Do not publish any local Zeroconf records */
1207
avahi_server_config_init(&config);
1208
config.publish_hinfo = 0;
1209
config.publish_addresses = 0;
1210
config.publish_workstation = 0;
1211
config.publish_domain = 0;
1213
/* Allocate a new server */
1214
mc.server = avahi_server_new(avahi_simple_poll_get
1215
(mc.simple_poll), &config, NULL,
1218
/* Free the Avahi configuration data */
1219
avahi_server_config_free(&config);
1222
/* Check if creating the Avahi server object succeeded */
1223
if(mc.server == NULL){
1224
fprintf(stderr, "Failed to create Avahi server: %s\n",
1225
avahi_strerror(error));
1226
exitcode = EXIT_FAILURE;
1230
/* Create the Avahi service browser */
1231
sb = avahi_s_service_browser_new(mc.server, if_index,
1232
AVAHI_PROTO_INET6, "_mandos._tcp",
1233
NULL, 0, browse_callback, NULL);
1235
fprintf(stderr, "Failed to create service browser: %s\n",
1236
avahi_strerror(avahi_server_errno(mc.server)));
1237
exitcode = EXIT_FAILURE;
1241
/* Run the main loop */
1244
fprintf(stderr, "Starting Avahi loop search\n");
1247
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);
1252
fprintf(stderr, "%s exiting\n", argv[0]);
1255
/* Cleanup things */
1257
avahi_s_service_browser_free(sb);
1259
if(mc.server != NULL)
1260
avahi_server_free(mc.server);
1262
if(mc.simple_poll != NULL)
1263
avahi_simple_poll_free(mc.simple_poll);
1265
if(gnutls_initialized){
1266
gnutls_certificate_free_credentials(mc.cred);
1267
gnutls_global_deinit();
1268
gnutls_dh_params_deinit(mc.dh_params);
1271
if(gpgme_initialized){
1272
gpgme_release(mc.ctx);
1275
/* Removes the temp directory used by GPGME */
1276
if(tempdir_created){
1278
struct dirent *direntry;
1279
d = opendir(tempdir);
1281
if(errno != ENOENT){
1113
1282
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);
1286
direntry = readdir(d);
1287
if(direntry == NULL){
1290
/* Skip "." and ".." */
1291
if(direntry->d_name[0] == '.'
1292
and (direntry->d_name[1] == '\0'
1293
or (direntry->d_name[1] == '.'
1294
and direntry->d_name[2] == '\0'))){
1297
char *fullname = NULL;
1298
ret = asprintf(&fullname, "%s/%s", tempdir,
1304
ret = remove(fullname);
1306
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1313
ret = rmdir(tempdir);
1314
if(ret == -1 and errno != ENOENT){