9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
64
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time(), sleep() */
66
#include <time.h> /* nanosleep(), time() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
74
getuid(), getgid(), setuid(),
76
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
87
#include <sys/klog.h> /* klogctl() */
127
125
static const char mandos_protocol_version[] = "1";
128
126
const char *argp_program_version = "mandos-client " VERSION;
129
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
133
129
/* Used for passing in values through the Avahi callback functions */
146
142
.dh_bits = 1024, .priority = "SECURE256"
147
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
153
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
147
* bytes. "buffer_capacity" is how much is currently allocated,
481
474
static int init_gnutls_session(gnutls_session_t *session){
483
476
/* GnuTLS session creation */
485
ret = gnutls_init(session, GNUTLS_SERVER);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
490
478
if(ret != GNUTLS_E_SUCCESS){
491
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
480
safer_gnutls_strerror(ret));
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
500
gnutls_deinit(*session);
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
486
if(ret != GNUTLS_E_SUCCESS){
505
487
fprintf(stderr, "Syntax error at: %s\n", err);
506
488
fprintf(stderr, "GnuTLS error: %s\n",
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
517
gnutls_deinit(*session);
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
521
497
if(ret != GNUTLS_E_SUCCESS){
522
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
499
safer_gnutls_strerror(ret));
528
504
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
531
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
537
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
515
__attribute__((unused)) const char *txt){}
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
540
520
/* Called when a Mandos server is found */
541
521
static int start_mandos_communication(const char *ip, uint16_t port,
542
522
AvahiIfIndex if_index,
809
767
ret = gnutls_handshake(session);
815
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
817
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
775
gnutls_perror(ret);
824
781
fprintf(stderr, "Unknown error while reading data from"
825
782
" encrypted session with Mandos server\n");
826
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
852
806
if(buffer_length > 0){
853
807
ssize_t decrypted_buffer_size;
867
820
(size_t)decrypted_buffer_size - written,
869
822
if(ret == 0 and ferror(stdout)){
872
824
fprintf(stderr, "Error writing encrypted data: %s\n",
873
825
strerror(errno));
878
830
written += (size_t)ret;
832
free(decrypted_buffer);
884
840
/* Shutdown procedure */
889
free(decrypted_buffer);
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
900
gnutls_deinit(session);
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
gnutls_deinit(session);
1024
971
errno = old_errno;
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1032
int good_interface(const struct dirent *if_entry){
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1041
if(if_entry->d_name[0] == '.'){
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1114
/* Accept this device */
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1122
974
int main(int argc, char *argv[]){
1123
975
AvahiSServiceBrowser *sb = NULL;
1126
978
intmax_t tmpmax;
1128
980
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
981
const char *interface = "eth0";
1130
982
struct ifreq network;
1132
984
bool take_down_interface = false;
987
char *connect_to = NULL;
1135
988
char tempdir[] = "/tmp/mandosXXXXXX";
1136
989
bool tempdir_created = false;
1137
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1142
995
bool gpgme_initialized = false;
1143
996
float delay = 2.5f;
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1146
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1151
/* Lower any group privileges we might have, just to be safe */
1158
/* Lower user privileges (temporarily) */
1170
1002
struct argp_option options[] = {
1171
1003
{ .name = "debug", .key = 128,
1200
1032
.arg = "SECONDS",
1201
1033
.doc = "Maximum delay to wait for interface startup",
1204
* These reproduce what we would get without ARGP_NO_HELP
1206
{ .name = "help", .key = '?',
1207
.doc = "Give this help list", .group = -1 },
1208
{ .name = "usage", .key = -3,
1209
.doc = "Give a short usage message", .group = -1 },
1210
{ .name = "version", .key = 'V',
1211
.doc = "Print program version", .group = -1 },
1212
1035
{ .name = NULL }
1215
1038
error_t parse_opt(int key, char *arg,
1216
1039
struct argp_state *state){
1219
1041
case 128: /* --debug */
1236
1058
tmpmax = strtoimax(arg, &tmp, 10);
1237
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1238
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1239
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1241
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1248
1071
delay = strtof(arg, &tmp);
1249
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
1073
fprintf(stderr, "Bad delay\n");
1254
* These reproduce what we would get without ARGP_NO_HELP
1256
case '?': /* --help */
1257
argp_state_help(state, state->out_stream,
1258
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1259
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1260
case -3: /* --usage */
1261
argp_state_help(state, state->out_stream,
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1265
exit(argp_err_exit_status);
1268
1082
return ARGP_ERR_UNKNOWN;
1273
1087
struct argp argp = { .options = options, .parser = parse_opt,
1274
1088
.args_doc = "",
1275
1089
.doc = "Mandos client -- Get and decrypt"
1276
1090
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1289
exitcode = EX_USAGE;
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1295
1100
avahi_set_log_function(empty_log);
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1308
if(interface == NULL){
1311
exitcode = EXIT_FAILURE;
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1323
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
1104
from the signal handler */
1335
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1337
1117
perror("sigaddset");
1338
exitcode = EX_OSERR;
1118
exitcode = EXIT_FAILURE;
1341
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1343
1123
perror("sigaddset");
1344
exitcode = EX_OSERR;
1124
exitcode = EXIT_FAILURE;
1347
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1349
1129
perror("sigaddset");
1350
exitcode = EX_OSERR;
1130
exitcode = EXIT_FAILURE;
1353
1133
/* Need to check if the handler is SIG_IGN before handling:
1357
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1359
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1362
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1365
1145
perror("sigaction");
1366
exitcode = EX_OSERR;
1146
exitcode = EXIT_FAILURE;
1370
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1372
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1375
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1378
1158
perror("sigaction");
1379
exitcode = EX_OSERR;
1159
exitcode = EXIT_FAILURE;
1383
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1385
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1388
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1391
1171
perror("sigaction");
1392
exitcode = EX_OSERR;
1172
exitcode = EXIT_FAILURE;
1397
1177
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1178
if(interface[0] != '\0'){
1399
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
1180
if(if_index == 0){
1401
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1182
exitcode = EXIT_FAILURE;
1410
/* Re-raise priviliges */
1417
1190
#ifdef __linux__
1418
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1192
messages to mess up the prompt */
1420
1193
ret = klogctl(8, NULL, 5);
1421
1194
bool restore_loglevel = true;
1472
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1474
1235
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1477
1238
#ifdef __linux__
1478
1239
if(restore_loglevel){
1479
1240
ret = klogctl(7, NULL, 0);
1569
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
1328
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1329
exitcode = EXIT_FAILURE;
1574
1332
gpgme_initialized = true;
1624
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
1626
if(quit_now or ret == 0){
1382
ret = start_mandos_communication(address, port, if_index, af);
1384
exitcode = EXIT_FAILURE;
1633
1386
exitcode = EXIT_SUCCESS;
1722
1474
/* Take down the network interface */
1723
1475
if(take_down_interface){
1724
/* Re-raise priviliges */
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
perror("ioctl SIOCSIFFLAGS");
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1745
/* Lower privileges permanently */
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1799
1537
sigemptyset(&old_sigterm_action.sa_mask);
1800
1538
old_sigterm_action.sa_handler = SIG_DFL;
1801
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1802
&old_sigterm_action,
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1805
1541
perror("sigaction");
1808
ret = raise(signal_received);
1809
} while(ret != 0 and errno == EINTR);
1814
TEMP_FAILURE_RETRY(pause());
1543
raise(signal_received);
1817
1546
return exitcode;