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() */
43
39
stdout, ferror(), remove() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
70
getuid(), getgid(), setuid(),
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
78
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
79
sigaction(), SIGTERM, sigaction,
89
83
#include <sys/klog.h> /* klogctl() */
127
121
static const char mandos_protocol_version[] = "1";
128
122
const char *argp_program_version = "mandos-client " VERSION;
129
123
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
125
/* Used for passing in values through the Avahi callback functions */
146
138
.dh_bits = 1024, .priority = "SECURE256"
147
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
153
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
143
* bytes. "buffer_capacity" is how much is currently allocated,
317
306
gpgme_recipient_t recipient;
318
307
recipient = result->recipients;
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
326
recipient = recipient->next;
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
316
recipient = recipient->next;
481
472
static int init_gnutls_session(gnutls_session_t *session){
483
474
/* GnuTLS session creation */
485
ret = gnutls_init(session, GNUTLS_SERVER);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
490
476
if(ret != GNUTLS_E_SUCCESS){
491
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
478
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);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
504
484
if(ret != GNUTLS_E_SUCCESS){
505
485
fprintf(stderr, "Syntax error at: %s\n", err);
506
486
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);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
521
495
if(ret != GNUTLS_E_SUCCESS){
522
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
497
safer_gnutls_strerror(ret));
528
502
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
531
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gnutls_dh_set_prime_bits(*session, mc.dh_bits);
541
516
static int start_mandos_communication(const char *ip, uint16_t port,
542
517
AvahiIfIndex if_index,
544
int ret, tcp_sd = -1;
547
522
struct sockaddr_in in;
548
523
struct sockaddr_in6 in6;
550
525
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
552
527
size_t buffer_length = 0;
553
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
556
532
gnutls_session_t session;
557
533
int pf; /* Protocol family */
589
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tcp_sd = socket(pf, SOCK_STREAM, 0);
592
559
perror("socket");
602
563
memset(&to, 0, sizeof(to));
603
564
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
605
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
567
} else { /* IPv4 */
607
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to.in.sin_family = (sa_family_t)af;
608
569
ret = inet_pton(af, ip, &to.in.sin_addr);
612
572
perror("inet_pton");
618
576
fprintf(stderr, "Bad address: %s\n", ip);
622
579
if(af == AF_INET6){
623
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
587
if(if_index == AVAHI_IF_UNSPEC){
631
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
589
" without a network interface\n");
636
592
/* Set the network interface number as scope */
637
593
to.in6.sin6_scope_id = (uint32_t)if_index;
735
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
743
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
751
674
ret = gnutls_handshake(session);
756
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
758
677
if(ret != GNUTLS_E_SUCCESS){
803
710
case GNUTLS_E_AGAIN:
805
712
case GNUTLS_E_REHANDSHAKE:
807
714
ret = gnutls_handshake(session);
813
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
815
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
816
718
gnutls_perror(ret);
822
724
fprintf(stderr, "Unknown error while reading data from"
823
725
" encrypted session with Mandos server\n");
824
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
834
736
fprintf(stderr, "Closing TLS session\n");
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
850
741
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
852
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
854
744
&decrypted_buffer);
855
745
if(decrypted_buffer_size >= 0){
858
747
while(written < (size_t) decrypted_buffer_size){
864
748
ret = (int)fwrite(decrypted_buffer + written, 1,
865
749
(size_t)decrypted_buffer_size - written,
867
751
if(ret == 0 and ferror(stdout)){
870
753
fprintf(stderr, "Error writing encrypted data: %s\n",
871
754
strerror(errno));
876
759
written += (size_t)ret;
761
free(decrypted_buffer);
882
769
/* Shutdown procedure */
887
free(decrypted_buffer);
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
898
gnutls_deinit(session);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
777
gnutls_deinit(session);
876
sig_atomic_t quit_now = 0;
1011
878
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
879
static void handle_sigterm(__attribute__((unused)) int sig){
1017
signal_received = sig;
1018
884
int old_errno = errno;
1019
885
if(mc.simple_poll != NULL){
1020
886
avahi_simple_poll_quit(mc.simple_poll);
1022
888
errno = old_errno;
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1030
int good_interface(const struct dirent *if_entry){
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if(if_entry->d_name[0] == '.'){
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
/* Accept this device */
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1120
891
int main(int argc, char *argv[]){
1121
892
AvahiSServiceBrowser *sb = NULL;
1124
895
intmax_t tmpmax;
1126
897
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
898
const char *interface = "eth0";
1128
899
struct ifreq network;
1130
bool take_down_interface = false;
903
char *connect_to = NULL;
1133
904
char tempdir[] = "/tmp/mandosXXXXXX";
1134
905
bool tempdir_created = false;
1135
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
911
bool gpgme_initialized = false;
1141
912
float delay = 2.5f;
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1144
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1149
/* Lower any group privileges we might have, just to be safe */
1156
/* Lower user privileges (temporarily) */
1168
918
struct argp_option options[] = {
1169
919
{ .name = "debug", .key = 128,
1198
948
.arg = "SECONDS",
1199
949
.doc = "Maximum delay to wait for interface startup",
1202
* These reproduce what we would get without ARGP_NO_HELP
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
1210
951
{ .name = NULL }
1213
954
error_t parse_opt(int key, char *arg,
1214
955
struct argp_state *state){
1217
957
case 128: /* --debug */
1234
974
tmpmax = strtoimax(arg, &tmp, 10);
1235
975
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
1239
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1246
987
delay = strtof(arg, &tmp);
1247
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
989
fprintf(stderr, "Bad delay\n");
1252
* These reproduce what we would get without ARGP_NO_HELP
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
1266
998
return ARGP_ERR_UNKNOWN;
1271
1003
struct argp argp = { .options = options, .parser = parse_opt,
1272
1004
.args_doc = "",
1273
1005
.doc = "Mandos client -- Get and decrypt"
1274
1006
" passwords from a Mandos server" };
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1287
exitcode = EX_USAGE;
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1293
1016
avahi_set_log_function(empty_log);
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1306
if(interface == NULL){
1309
exitcode = EXIT_FAILURE;
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1321
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
1020
from the signal handler */
1333
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1335
1033
perror("sigaddset");
1336
exitcode = EX_OSERR;
1034
exitcode = EXIT_FAILURE;
1339
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1341
1039
perror("sigaddset");
1342
exitcode = EX_OSERR;
1040
exitcode = EXIT_FAILURE;
1345
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1347
1045
perror("sigaddset");
1348
exitcode = EX_OSERR;
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1357
perror("sigaction");
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1370
perror("sigaction");
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1383
perror("sigaction");
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1046
exitcode = EXIT_FAILURE;
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1395
1056
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1408
/* Re-raise priviliges */
1057
if(interface[0] != '\0'){
1415
1058
#ifdef __linux__
1416
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1060
messages to mess up the prompt */
1418
1061
ret = klogctl(8, NULL, 5);
1419
1062
bool restore_loglevel = true;
1457
1094
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1095
exitcode = EXIT_FAILURE;
1467
1098
if((network.ifr_flags & IFF_UP) == 0){
1468
1099
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1475
1104
#ifdef __linux__
1476
1105
if(restore_loglevel){
1477
1106
ret = klogctl(7, NULL, 0);
1521
1141
#endif /* __linux__ */
1522
/* Lower privileges */
1524
if(take_down_interface){
1525
/* Lower privileges */
1531
/* Lower privileges permanently */
1543
1158
ret = init_gnutls_global(pubkey, seckey);
1545
1160
fprintf(stderr, "init_gnutls_global failed\n");
1546
exitcode = EX_UNAVAILABLE;
1161
exitcode = EXIT_FAILURE;
1549
1164
gnutls_initialized = true;
1556
tempdir_created = true;
1557
1167
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
1168
perror("mkdtemp");
1171
tempdir_created = true;
1567
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
1174
fprintf(stderr, "init_gpgme failed\n");
1569
exitcode = EX_UNAVAILABLE;
1175
exitcode = EXIT_FAILURE;
1572
1178
gpgme_initialized = true;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1579
1190
if(connect_to != NULL){
1582
1193
char *address = strrchr(connect_to, ':');
1583
1194
if(address == NULL){
1584
1195
fprintf(stderr, "No colon in address\n");
1585
exitcode = EX_USAGE;
1196
exitcode = EXIT_FAILURE;
1595
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1596
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
1203
or tmpmax != (uint16_t)tmpmax){
1598
1204
fprintf(stderr, "Bad port number\n");
1599
exitcode = EX_USAGE;
1205
exitcode = EXIT_FAILURE;
1607
1208
port = (uint16_t)tmpmax;
1608
1209
*address = '\0';
1609
1210
address = connect_to;
1729
1295
gpgme_release(mc.ctx);
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1755
/* Lower privileges permanently */
1764
1298
/* Removes the temp directory used by GPGME */
1765
1299
if(tempdir_created){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1815
perror("sigaction");
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1824
TEMP_FAILURE_RETRY(pause());
1827
1342
return exitcode;