26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
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() */
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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() */
92
79
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
96
83
/* All Avahi types, constants and functions
249
160
* Helper function to insert pub and seckey to the engine keyring.
251
162
bool import_key(const char *filename){
254
164
gpgme_data_t pgp_data;
256
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
173
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
175
gpgme_strsource(rc), gpgme_strerror(rc));
270
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
271
180
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
274
182
gpgme_strsource(rc), gpgme_strerror(rc));
278
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
190
gpgme_data_release(pgp_data);
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
292
199
gpgme_check_version(NULL);
293
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
201
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
203
gpgme_strsource(rc), gpgme_strerror(rc));
301
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
302
208
rc = gpgme_get_engine_info(&engine_info);
303
209
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
211
gpgme_strsource(rc), gpgme_strerror(rc));
377
278
/* Decrypt data from the cryptotext data buffer to the plaintext
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
281
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
283
gpgme_strsource(rc), gpgme_strerror(rc));
384
284
plaintext_length = -1;
386
286
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
388
288
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
394
292
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
397
294
result->wrong_key_usage);
398
295
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
402
298
gpgme_recipient_t recipient;
403
299
recipient = result->recipients;
404
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
414
recipient = recipient->next;
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;
516
409
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
518
411
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
521
417
gnutls_global_deinit();
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
528
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
532
427
ret = gnutls_certificate_set_openpgp_key_file
533
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
534
429
GNUTLS_OPENPGP_FMT_BASE64);
535
430
if(ret != GNUTLS_E_SUCCESS){
537
"Mandos plugin mandos-client: "
538
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
545
439
/* GnuTLS server initialization */
546
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
547
441
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
550
443
" %s\n", safer_gnutls_strerror(ret));
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
554
447
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
557
449
safer_gnutls_strerror(ret));
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
567
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
568
460
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
573
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
575
468
/* GnuTLS session creation */
577
ret = gnutls_init(session, GNUTLS_SERVER);
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
582
470
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
585
472
safer_gnutls_strerror(ret));
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
593
gnutls_deinit(*session);
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
597
478
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
602
482
gnutls_deinit(*session);
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
611
gnutls_deinit(*session);
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
615
489
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
618
491
safer_gnutls_strerror(ret));
619
492
gnutls_deinit(*session);
623
496
/* ignore client certificate if any. */
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
509
/* Called when a Mandos server is found */
636
510
static int start_mandos_communication(const char *ip, uint16_t port,
637
511
AvahiIfIndex if_index,
639
int ret, tcp_sd = -1;
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
645
516
char *buffer = NULL;
646
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
647
518
size_t buffer_length = 0;
648
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
523
char interface[IF_NAMESIZE];
651
524
gnutls_session_t session;
652
int pf; /* Protocol family */
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
675
ret = init_gnutls_session(&session);
526
ret = init_gnutls_session(mc, &session);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
689
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);
699
550
memset(&to, 0, sizeof(to));
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
709
perror_plus("inet_pton");
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
560
fprintf(stderr, "Bad address: %s\n", ip);
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
723
-Wunreachable-code */
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
728
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
735
/* Set the network interface number as scope */
736
to.in6.sin6_scope_id = (uint32_t)if_index;
739
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
741
565
-Wunreachable-code */
567
to.in6.sin6_scope_id = (uint32_t)if_index;
750
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
char interface[IF_NAMESIZE];
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
774
perror_plus("inet_ntop");
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){
776
577
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
583
ret = connect(tcp_sd, &to.in, sizeof(to));
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
796
perror_plus("connect");
807
589
const char *out = mandos_protocol_version;
1118
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
1134
signal_received = sig;
1135
int old_errno = errno;
1136
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1148
perror_plus("socket");
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1155
perror_plus("ioctl SIOCGIFFLAGS");
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1197
/* Accept this device */
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1216
if(not get_flags(if_entry->d_name, &ifr)){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1225
if(not good_flags(if_entry->d_name, &ifr)){
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1242
if(not get_flags(if_entry->d_name, &ifr)){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1271
if(not good_flags(if_entry->d_name, &ifr)){
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1294
if((direntry->d_name)[0] == '\0'){
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1316
perror_plus("asprintf");
1320
ret = stat(fullname, &st);
1323
perror_plus("Could not stat hook");
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1355
if(mc.current_server == NULL){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1360
ret = avahi_simple_poll_iterate(s, -1);
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1370
perror_plus("clock_gettime");
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1397
avahi_simple_poll_quit(mc.simple_poll);
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1403
perror_plus("clock_gettime");
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1421
824
int main(int argc, char *argv[]){
1422
825
AvahiSServiceBrowser *sb = NULL;
1425
828
intmax_t tmpmax;
1427
830
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
831
const char *interface = "eth0";
1429
832
struct ifreq network;
1431
bool take_down_interface = false;
836
char *connect_to = NULL;
1434
837
char tempdir[] = "/tmp/mandosXXXXXX";
1435
838
bool tempdir_created = false;
1436
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
840
const char *seckey = PATHDIR "/" SECKEY;
1438
841
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" };
1440
846
bool gnutls_initialized = false;
1441
847
bool gpgme_initialized = false;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1447
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1452
/* Lower any group privileges we might have, just to be safe */
1456
perror_plus("setgid");
1459
/* Lower user privileges (temporarily) */
1463
perror_plus("seteuid");
1471
851
struct argp_option options[] = {
1553
915
mc.priority = arg;
1555
917
case 131: /* --delay */
1557
delay = strtof(arg, &tmp);
1558
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1561
case 132: /* --retry */
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1570
case 133: /* --network-hook-dir */
1574
* These reproduce what we would get without ARGP_NO_HELP
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
1589
929
return ARGP_ERR_UNKNOWN;
1594
934
struct argp argp = { .options = options, .parser = parse_opt,
1596
936
.doc = "Mandos client -- Get and decrypt"
1597
937
" passwords from a Mandos server" };
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1610
exitcode = EX_USAGE;
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1620
/* Re-raise priviliges */
1624
perror_plus("seteuid");
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1634
perror_plus("fstat");
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1639
perror_plus("fchown");
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1654
perror_plus("fstat");
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1659
perror_plus("fchown");
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
/* Find network hooks and run them */
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1682
perror_plus("scandir");
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1690
perror_plus("asprintf");
1693
pid_t hook_pid = fork();
1696
dup2(devnull, STDIN_FILENO);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1701
perror_plus("setenv");
1704
ret = setenv("DEVICE", interface, 1);
1706
perror_plus("setenv");
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1711
perror_plus("setenv");
1714
ret = setenv("MODE", "start", 1);
1716
perror_plus("setenv");
1720
ret = asprintf(&delaystring, "%f", delay);
1722
perror_plus("asprintf");
1725
ret = setenv("DELAY", delaystring, 1);
1728
perror_plus("setenv");
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
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");
1807
941
exitcode = EXIT_FAILURE;
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1849
perror_plus("sigaction");
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1862
perror_plus("sigaction");
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1875
perror_plus("sigaction");
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1887
946
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1901
/* Re-raise priviliges */
1905
perror_plus("seteuid");
1908
948
#ifdef __linux__
1909
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1911
951
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1917
#endif /* __linux__ */
1919
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
960
exitcode = EXIT_FAILURE;
1923
961
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1927
perror_plus("klogctl");
1930
#endif /* __linux__ */
1931
/* Lower privileges */
962
ret = klogctl(7, NULL, 0);
1935
perror_plus("seteuid");
1939
969
strcpy(network.ifr_name, interface);
1940
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1943
973
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1947
perror_plus("klogctl");
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
974
ret = klogctl(7, NULL, 0);
1956
perror_plus("seteuid");
979
exitcode = EXIT_FAILURE;
1960
982
if((network.ifr_flags & IFF_UP) == 0){
1961
983
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1968
988
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1972
perror_plus("klogctl");
1975
#endif /* __linux__ */
1976
/* Lower privileges */
989
ret = klogctl(7, NULL, 0);
1980
perror_plus("seteuid");
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1987
998
for(int i=0; i < delay * 4; i++){
1988
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1991
1002
} else if(network.ifr_flags & IFF_RUNNING){
1994
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
1006
ret = nanosleep(&sleeptime, NULL);
1996
1007
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1008
perror("nanosleep");
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
perror_plus("close");
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2007
1015
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2012
perror_plus("klogctl");
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2018
if(take_down_interface){
2019
/* Lower privileges */
2022
perror_plus("seteuid");
2025
/* Lower privileges permanently */
2028
perror_plus("setuid");
2037
ret = init_gnutls_global(pubkey, seckey);
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
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;
2044
1043
gnutls_initialized = true;
2051
1046
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
2055
1050
tempdir_created = true;
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2067
1057
gpgme_initialized = true;
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2233
1178
if(gpgme_initialized){
2234
1179
gpgme_release(mc.ctx);
2237
/* Cleans up the circular linked list of Mandos servers the client
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2248
/* XXX run network hooks "stop" here */
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2256
perror_plus("seteuid");
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
2282
/* Removes the GPGME temp directory and all files inside */
1182
/* Removes the temp directory used by GPGME */
2283
1183
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
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'))){
2291
1204
char *fullname = NULL;
2292
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
1206
direntry->d_name);
2295
perror_plus("asprintf");
2298
1211
ret = remove(fullname);
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2303
1216
free(fullname);
2307
/* need to clean even if 0 because man page doesn't specify */
2309
if (numentries == -1){
2310
perror_plus("scandir");
2312
1220
ret = rmdir(tempdir);
2313
1221
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2325
perror_plus("sigaction");
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2331
perror_plus("raise");
2334
TEMP_FAILURE_RETRY(pause());
2337
1226
return exitcode;