26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
62
64
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
69
SIOCSIFFLAGS, if_indextoname(),
67
70
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
79
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
83
96
/* All Avahi types, constants and functions
160
241
* Helper function to insert pub and seckey to the engine keyring.
162
243
bool import_key(const char *filename){
164
246
gpgme_data_t pgp_data;
166
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
172
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
255
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
175
258
gpgme_strsource(rc), gpgme_strerror(rc));
179
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
180
263
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
182
266
gpgme_strsource(rc), gpgme_strerror(rc));
186
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
perror_plus("close");
190
274
gpgme_data_release(pgp_data);
195
fprintf(stderr, "Initialize gpgme\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
199
284
gpgme_check_version(NULL);
200
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
286
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
203
289
gpgme_strsource(rc), gpgme_strerror(rc));
207
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
208
294
rc = gpgme_get_engine_info(&engine_info);
209
295
if(rc != GPG_ERR_NO_ERROR){
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
211
298
gpgme_strsource(rc), gpgme_strerror(rc));
278
369
/* Decrypt data from the cryptotext data buffer to the plaintext
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
372
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
283
375
gpgme_strsource(rc), gpgme_strerror(rc));
284
376
plaintext_length = -1;
286
378
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
288
380
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
291
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
292
386
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
294
389
result->wrong_key_usage);
295
390
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
298
394
gpgme_recipient_t recipient;
299
395
recipient = result->recipients;
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
308
recipient = recipient->next;
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
406
recipient = recipient->next;
409
508
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
510
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
417
513
gnutls_global_deinit();
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
423
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
427
524
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
429
526
GNUTLS_OPENPGP_FMT_BASE64);
430
527
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
432
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
439
537
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
441
539
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
443
542
" %s\n", safer_gnutls_strerror(ret));
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
546
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
449
549
safer_gnutls_strerror(ret));
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
459
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
460
560
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
565
static int init_gnutls_session(gnutls_session_t *session){
468
567
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
569
ret = gnutls_init(session, GNUTLS_SERVER);
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
574
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
472
577
safer_gnutls_strerror(ret));
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
gnutls_deinit(*session);
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
589
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
482
594
gnutls_deinit(*session);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
gnutls_deinit(*session);
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
607
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
491
610
safer_gnutls_strerror(ret));
492
611
gnutls_deinit(*session);
496
615
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
509
627
/* Called when a Mandos server is found */
510
628
static int start_mandos_communication(const char *ip, uint16_t port,
511
629
AvahiIfIndex if_index,
631
int ret, tcp_sd = -1;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
516
637
char *buffer = NULL;
517
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
518
639
size_t buffer_length = 0;
519
640
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
523
char interface[IF_NAMESIZE];
524
643
gnutls_session_t session;
526
ret = init_gnutls_session(mc, &session);
644
int pf; /* Protocol family */
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
667
ret = init_gnutls_session(&session);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
681
perror_plus("socket");
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
547
fprintf(stderr, "Binding to interface %s\n", interface);
550
691
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
701
perror_plus("inet_pton");
560
fprintf(stderr, "Bad address: %s\n", ip);
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wunreachable-code */
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
727
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
731
to.in.sin_port = htons(port); /* Spurious warnings from
565
733
-Wunreachable-code */
567
to.in6.sin6_scope_id = (uint32_t)if_index;
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
char interface[IF_NAMESIZE];
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
766
perror_plus("inet_ntop");
577
768
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
583
ret = connect(tcp_sd, &to.in, sizeof(to));
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
perror_plus("connect");
589
799
const char *out = mandos_protocol_version;
815
1111
case AVAHI_BROWSER_ALL_FOR_NOW:
816
1112
case AVAHI_BROWSER_CACHE_EXHAUSTED:
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
1127
signal_received = sig;
1128
int old_errno = errno;
1129
/* set main loop to exit */
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
perror_plus("socket");
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1148
perror_plus("ioctl SIOCGIFFLAGS");
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1190
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1209
if(not get_flags(if_entry->d_name, &ifr)){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1218
if(not good_flags(if_entry->d_name, &ifr)){
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1235
if(not get_flags(if_entry->d_name, &ifr)){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1264
if(not good_flags(if_entry->d_name, &ifr)){
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1286
if((direntry->d_name)[0] == '\0'){
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1310
perror_plus("Could not stat plugin");
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1332
if(mc.current_server == NULL){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1337
ret = avahi_simple_poll_iterate(s, -1);
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
perror_plus("clock_gettime");
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1374
avahi_simple_poll_quit(mc.simple_poll);
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1380
perror_plus("clock_gettime");
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
824
1398
int main(int argc, char *argv[]){
825
1399
AvahiSServiceBrowser *sb = NULL;
828
1402
intmax_t tmpmax;
830
1404
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1405
const char *interface = "";
832
1406
struct ifreq network;
1408
bool take_down_interface = false;
836
char *connect_to = NULL;
837
1411
char tempdir[] = "/tmp/mandosXXXXXX";
838
1412
bool tempdir_created = false;
839
1413
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1414
const char *seckey = PATHDIR "/" SECKEY;
841
1415
const char *pubkey = PATHDIR "/" PUBKEY;
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1417
bool gnutls_initialized = false;
847
1418
bool gpgme_initialized = false;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1429
/* Lower any group privileges we might have, just to be safe */
1433
perror_plus("setgid");
1436
/* Lower user privileges (temporarily) */
1440
perror_plus("seteuid");
851
1448
struct argp_option options[] = {
915
1526
mc.priority = arg;
917
1528
case 131: /* --delay */
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
1530
delay = strtof(arg, &tmp);
1531
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
argp_error(state, "Bad delay");
1534
case 132: /* --retry */
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
1544
* These reproduce what we would get without ARGP_NO_HELP
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
929
1559
return ARGP_ERR_UNKNOWN;
934
1564
struct argp argp = { .options = options, .parser = parse_opt,
936
1566
.doc = "Mandos client -- Get and decrypt"
937
1567
" passwords from a Mandos server" };
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1580
exitcode = EX_USAGE;
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1590
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1741
avahi_set_log_function(empty_log);
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1750
/* No up interfaces, look for any good interfaces */
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1762
if(interface == NULL){
1763
perror_plus("malloc");
1765
exitcode = EXIT_FAILURE;
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
941
1773
exitcode = EXIT_FAILURE;
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
from the signal handler */
1780
/* Initialize the pseudo-RNG for Avahi */
1781
srand((unsigned int) time(NULL));
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1790
sigemptyset(&sigterm_action.sa_mask);
1791
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1797
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1803
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1815
perror_plus("sigaction");
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1828
perror_plus("sigaction");
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1841
perror_plus("sigaction");
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
946
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1867
/* Re-raise priviliges */
1871
perror_plus("seteuid");
948
1874
#ifdef __linux__
949
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1876
messages about the network interface to mess up the prompt */
951
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1883
#endif /* __linux__ */
957
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
960
exitcode = EXIT_FAILURE;
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
961
1889
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1893
perror_plus("klogctl");
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1901
perror_plus("seteuid");
969
1905
strcpy(network.ifr_name, interface);
970
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
972
perror("ioctl SIOCGIFFLAGS");
1908
perror_plus("ioctl SIOCGIFFLAGS");
973
1909
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1913
perror_plus("klogctl");
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1922
perror_plus("seteuid");
979
exitcode = EXIT_FAILURE;
982
1926
if((network.ifr_flags & IFF_UP) == 0){
983
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
984
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
988
1934
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1938
perror_plus("klogctl");
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1946
perror_plus("seteuid");
997
/* sleep checking until interface is running */
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
998
1953
for(int i=0; i < delay * 4; i++){
999
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1001
perror("ioctl SIOCGIFFLAGS");
1956
perror_plus("ioctl SIOCGIFFLAGS");
1002
1957
} else if(network.ifr_flags & IFF_RUNNING){
1005
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
1961
ret = nanosleep(&sleeptime, NULL);
1007
1962
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
1963
perror_plus("nanosleep");
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1970
perror_plus("close");
1015
1973
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1978
perror_plus("klogctl");
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1984
if(take_down_interface){
1985
/* Lower privileges */
1988
perror_plus("seteuid");
1991
/* Lower privileges permanently */
1994
perror_plus("setuid");
2003
ret = init_gnutls_global(pubkey, seckey);
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
1043
2010
gnutls_initialized = true;
1046
2017
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
1050
2021
tempdir_created = true;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1057
2033
gpgme_initialized = true;
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1178
2199
if(gpgme_initialized){
1179
2200
gpgme_release(mc.ctx);
1182
/* Removes the temp directory used by GPGME */
2203
/* Cleans up the circular linked list of Mandos servers the client
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2214
/* XXX run network hooks "stop" here */
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2222
perror_plus("seteuid");
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2237
perror_plus("close");
2239
/* Lower privileges permanently */
2243
perror_plus("setuid");
2248
/* Removes the GPGME temp directory and all files inside */
1183
2249
if(tempdir_created){
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1188
if(errno != ENOENT){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
1204
2257
char *fullname = NULL;
1205
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
2259
direntry->d_name);
2261
perror_plus("asprintf");
1211
2264
ret = remove(fullname);
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1216
2269
free(fullname);
2273
/* need to clean even if 0 because man page doesn't specify */
2275
if (numentries == -1){
2276
perror_plus("scandir");
1220
2278
ret = rmdir(tempdir);
1221
2279
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2291
perror_plus("sigaction");
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2297
perror_plus("raise");
2300
TEMP_FAILURE_RETRY(pause());
1226
2303
return exitcode;