36
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
41
40
#include <stdint.h> /* uint16_t, uint32_t */
42
41
#include <stddef.h> /* NULL, size_t, ssize_t */
43
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, false, true */
44
#include <stdbool.h> /* bool, true */
46
45
#include <string.h> /* memset(), strcmp(), strlen(),
47
46
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
49
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
49
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
53
52
#include <sys/stat.h> /* open() */
54
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
54
struct in6_addr, inet_pton(),
56
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
60
59
#include <assert.h> /* assert() */
61
60
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
61
#include <time.h> /* time() */
63
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
63
SIOCSIFFLAGS, if_indextoname(),
65
64
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
65
#include <netinet/in.h>
69
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
67
getuid(), getgid(), setuid(),
72
69
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
70
#include <iso646.h> /* not, and */
74
71
#include <argp.h> /* struct argp_option, error_t, struct
75
72
argp_state, struct argp,
76
73
argp_parse(), ARGP_KEY_ARG,
77
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
80
#include <sys/klog.h> /* klogctl() */
84
77
/* All Avahi types, constants and functions
441
429
/* GnuTLS server initialization */
442
ret = gnutls_dh_params_init(&mc.dh_params);
443
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
445
" %s\n", safer_gnutls_strerror(ret));
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
448
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
449
if(ret != GNUTLS_E_SUCCESS){
450
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
451
safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
455
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
461
gnutls_certificate_free_credentials(mc.cred);
449
gnutls_certificate_free_credentials(mc->cred);
462
450
gnutls_global_deinit();
463
gnutls_dh_params_deinit(mc.dh_params);
451
gnutls_dh_params_deinit(mc->dh_params);
467
static int init_gnutls_session(gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
469
458
/* GnuTLS session creation */
470
459
ret = gnutls_init(session, GNUTLS_SERVER);
471
if(ret != GNUTLS_E_SUCCESS){
460
if (ret != GNUTLS_E_SUCCESS){
472
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
462
safer_gnutls_strerror(ret));
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
479
if(ret != GNUTLS_E_SUCCESS){
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
480
469
fprintf(stderr, "Syntax error at: %s\n", err);
481
470
fprintf(stderr, "GnuTLS error: %s\n",
482
471
safer_gnutls_strerror(ret));
483
gnutls_deinit(*session);
472
gnutls_deinit (*session);
488
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
490
if(ret != GNUTLS_E_SUCCESS){
479
if (ret != GNUTLS_E_SUCCESS) {
491
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
481
safer_gnutls_strerror(ret));
493
gnutls_deinit(*session);
482
gnutls_deinit (*session);
497
486
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
487
gnutls_certificate_server_set_request (*session,
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
872
static void handle_sigterm(__attribute__((unused)) int sig){
873
int old_errno = errno;
874
avahi_simple_poll_quit(mc.simple_poll);
878
811
int main(int argc, char *argv[]){
879
AvahiSServiceBrowser *sb = NULL;
884
int exitcode = EXIT_SUCCESS;
885
const char *interface = "eth0";
886
struct ifreq network;
890
char *connect_to = NULL;
891
char tempdir[] = "/tmp/mandosXXXXXX";
892
bool tempdir_created = false;
893
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
894
const char *seckey = PATHDIR "/" SECKEY;
895
const char *pubkey = PATHDIR "/" PUBKEY;
897
bool gnutls_initialized = false;
898
bool gpgme_initialized = false;
901
struct sigaction old_sigterm_action;
902
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
904
/* Initialize mandos context */
905
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
906
.dh_bits = 1024, .priority = "SECURE256"
907
":!CTYPE-X.509:+CTYPE-OPENPGP" };
910
struct argp_option options[] = {
911
{ .name = "debug", .key = 128,
912
.doc = "Debug mode", .group = 3 },
913
{ .name = "connect", .key = 'c',
914
.arg = "ADDRESS:PORT",
915
.doc = "Connect directly to a specific Mandos server",
917
{ .name = "interface", .key = 'i',
919
.doc = "Network interface that will be used to search for"
922
{ .name = "seckey", .key = 's',
924
.doc = "OpenPGP secret key file base name",
926
{ .name = "pubkey", .key = 'p',
928
.doc = "OpenPGP public key file base name",
930
{ .name = "dh-bits", .key = 129,
932
.doc = "Bit length of the prime number used in the"
933
" Diffie-Hellman key exchange",
935
{ .name = "priority", .key = 130,
937
.doc = "GnuTLS priority string for the TLS handshake",
939
{ .name = "delay", .key = 131,
941
.doc = "Maximum delay to wait for interface startup",
946
error_t parse_opt(int key, char *arg,
947
struct argp_state *state){
949
case 128: /* --debug */
952
case 'c': /* --connect */
955
case 'i': /* --interface */
958
case 's': /* --seckey */
961
case 'p': /* --pubkey */
964
case 129: /* --dh-bits */
965
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
966
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
967
or arg[numchars] != '\0'){
968
fprintf(stderr, "Bad number of DH bits\n");
971
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
973
case 130: /* --priority */
976
case 131: /* --delay */
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
988
return ARGP_ERR_UNKNOWN;
993
struct argp argp = { .options = options, .parser = parse_opt,
995
.doc = "Mandos client -- Get and decrypt"
996
" passwords from a Mandos server" };
997
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
998
if(ret == ARGP_ERR_UNKNOWN){
999
fprintf(stderr, "Unknown error while parsing arguments\n");
1000
exitcode = EXIT_FAILURE;
1005
/* If the interface is down, bring it up */
1006
if(interface[0] != '\0'){
1008
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1009
messages to mess up the prompt */
1010
ret = klogctl(8, NULL, 5);
1011
bool restore_loglevel = true;
1013
restore_loglevel = false;
1018
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1021
exitcode = EXIT_FAILURE;
1023
if(restore_loglevel){
1024
ret = klogctl(7, NULL, 0);
1032
strcpy(network.ifr_name, interface);
1033
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1035
perror("ioctl SIOCGIFFLAGS");
1037
if(restore_loglevel){
1038
ret = klogctl(7, NULL, 0);
1044
exitcode = EXIT_FAILURE;
1047
if((network.ifr_flags & IFF_UP) == 0){
1048
network.ifr_flags |= IFF_UP;
1049
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1051
perror("ioctl SIOCSIFFLAGS");
1052
exitcode = EXIT_FAILURE;
1054
if(restore_loglevel){
1055
ret = klogctl(7, NULL, 0);
812
AvahiSServiceBrowser *sb = NULL;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
841
{ .name = "interface", .key = 'i',
843
.doc = "Interface that will be used to search for Mandos"
846
{ .name = "seckey", .key = 's',
848
.doc = "OpenPGP secret key file base name",
850
{ .name = "pubkey", .key = 'p',
852
.doc = "OpenPGP public key file base name",
854
{ .name = "dh-bits", .key = 129,
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
859
{ .name = "priority", .key = 130,
861
.doc = "GnuTLS priority string for the TLS handshake",
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
871
case 128: /* --debug */
874
case 'c': /* --connect */
877
case 'i': /* --interface */
880
case 's': /* --seckey */
883
case 'p': /* --pubkey */
886
case 129: /* --dh-bits */
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
894
case 130: /* --priority */
902
return ARGP_ERR_UNKNOWN;
907
struct argp argp = { .options = options, .parser = parse_opt,
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
1064
/* sleep checking until interface is running */
1065
for(int i=0; i < delay * 4; i++){
919
/* If the interface is down, bring it up */
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
exitcode = EXIT_FAILURE;
927
strcpy(network.ifr_name, interface);
1066
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1068
930
perror("ioctl SIOCGIFFLAGS");
1069
} else if(network.ifr_flags & IFF_RUNNING){
1072
struct timespec sleeptime = { .tv_nsec = 250000000 };
1073
ret = nanosleep(&sleeptime, NULL);
1074
if(ret == -1 and errno != EINTR){
1075
perror("nanosleep");
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1083
if(restore_loglevel){
1084
/* Restores kernel loglevel to default */
1085
ret = klogctl(7, NULL, 0);
931
exitcode = EXIT_FAILURE;
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
943
ret = TEMP_FAILURE_RETRY(close(sd));
1107
ret = init_gnutls_global(pubkey, seckey);
1109
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
1113
gnutls_initialized = true;
1116
if(mkdtemp(tempdir) == NULL){
1120
tempdir_created = true;
1122
if(not init_gpgme(pubkey, seckey, tempdir)){
1123
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
1127
gpgme_initialized = true;
1130
if(interface[0] != '\0'){
962
ret = init_gnutls_global(&mc, pubkey, seckey);
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
968
gnutls_initalized = true;
971
if(mkdtemp(tempdir) == NULL){
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
982
gpgme_initalized = true;
1131
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
1132
986
if(if_index == 0){
1133
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1134
exitcode = EXIT_FAILURE;
1139
if(connect_to != NULL){
1140
/* Connect directly, do not use Zeroconf */
1141
/* (Mainly meant for debugging) */
1142
char *address = strrchr(connect_to, ':');
1143
if(address == NULL){
1144
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
1152
fprintf(stderr, "Bad port number\n");
1153
exitcode = EXIT_FAILURE;
1156
port = (uint16_t)tmpmax;
1158
address = connect_to;
1159
/* Colon in address indicates IPv6 */
1161
if(strchr(address, ':') != NULL){
1166
ret = start_mandos_communication(address, port, if_index,
1169
exitcode = EXIT_FAILURE;
1171
exitcode = EXIT_SUCCESS;
1177
avahi_set_log_function(empty_log);
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1192
AvahiServerConfig config;
1193
/* Do not publish any local Zeroconf records */
1194
avahi_server_config_init(&config);
1195
config.publish_hinfo = 0;
1196
config.publish_addresses = 0;
1197
config.publish_workstation = 0;
1198
config.publish_domain = 0;
1200
/* Allocate a new server */
1201
mc.server = avahi_server_new(avahi_simple_poll_get
1202
(mc.simple_poll), &config, NULL,
1205
/* Free the Avahi configuration data */
1206
avahi_server_config_free(&config);
1209
/* Check if creating the Avahi server object succeeded */
1210
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
1217
/* Create the Avahi service browser */
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1220
NULL, 0, browse_callback, NULL);
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1242
/* Run the main loop */
1245
fprintf(stderr, "Starting Avahi loop search\n");
1248
avahi_simple_poll_loop(mc.simple_poll);
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1011
exitcode = EXIT_FAILURE;
1013
exitcode = EXIT_SUCCESS;
1019
avahi_set_log_function(empty_log);
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
exitcode = EXIT_FAILURE;
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1072
/* Run the main loop */
1075
fprintf(stderr, "Starting Avahi loop search\n");
1078
avahi_simple_poll_loop(mc.simple_poll);
1253
fprintf(stderr, "%s exiting\n", argv[0]);
1256
/* Cleanup things */
1258
avahi_s_service_browser_free(sb);
1260
if(mc.server != NULL)
1261
avahi_server_free(mc.server);
1263
if(mc.simple_poll != NULL)
1264
avahi_simple_poll_free(mc.simple_poll);
1266
if(gnutls_initialized){
1267
gnutls_certificate_free_credentials(mc.cred);
1268
gnutls_global_deinit();
1269
gnutls_dh_params_deinit(mc.dh_params);
1272
if(gpgme_initialized){
1273
gpgme_release(mc.ctx);
1276
/* Removes the temp directory used by GPGME */
1277
if(tempdir_created){
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1282
if(errno != ENOENT){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1086
/* Cleanup things */
1088
avahi_s_service_browser_free(sb);
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1283
1112
perror("opendir");
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1298
char *fullname = NULL;
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
1305
ret = remove(fullname);
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1314
ret = rmdir(tempdir);
1315
if(ret == -1 and errno != ENOENT){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);