To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 282
- compare with another revision
- download diff
- download tarball
- view history from revision 282
- Committer: Teddy Hogeborn
- Date: 2011-03-08 19:12:56 UTC
- mfrom: (237.7.20 trunk)
- Revision ID: teddy@fukt.bsnet.se-20110308191256-mjcukty9on3z0yhd
Merge from trunk.
- files removed:
- debian/source/local-options
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
87
91
88
#ifdef __linux__
92
89
#include <sys/klog.h> /* klogctl() */
125
122
#define PATHDIR "/conf/conf.d/mandos"
126
123
#define SECKEY "seckey.txt"
127
124
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
125
130
126
bool debug = false;
131
127
static const char mandos_protocol_version[] = "1";
132
128
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
130
static const char sys_class_net[] = "/sys/class/net";
135
131
char *connect_to = NULL;
136
132
137
/* Doubly linked list that need to be circularly linked when used */
138
typedef struct server{
139
const char *ip;
140
uint16_t port;
141
AvahiIfIndex if_index;
142
int af;
143
struct timespec last_seen;
144
struct server *next;
145
struct server *prev;
146
} server;
147
148
133
/* Used for passing in values through the Avahi callback functions */
149
134
typedef struct {
150
135
AvahiSimplePoll *simple_poll;
154
139
gnutls_dh_params_t dh_params;
155
140
const char *priority;
156
141
gpgme_ctx_t ctx;
157
server *current_server;
158
142
} mandos_context;
159
143
160
144
/* global context so signal handler can reach it*/
161
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
146
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
148
166
149
sig_atomic_t quit_now = 0;
167
150
int signal_received = 0;
168
151
169
/* Function to use when printing errors */
170
void perror_plus(const char *print_text){
171
fprintf(stderr, "Mandos plugin %s: ",
172
program_invocation_short_name);
173
perror(print_text);
174
}
175
176
152
/*
177
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
154
* bytes. "buffer_capacity" is how much is currently allocated,
190
166
return buffer_capacity;
191
167
}
192
168
193
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
169
/*
232
170
* Initialize GPGME.
233
171
*/
247
185
248
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
187
if(fd == -1){
250
perror_plus("open");
188
perror("open");
251
189
return false;
252
190
}
253
191
254
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
193
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
195
gpgme_strsource(rc), gpgme_strerror(rc));
259
196
return false;
260
197
}
261
198
262
199
rc = gpgme_op_import(mc.ctx, pgp_data);
263
200
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
202
gpgme_strsource(rc), gpgme_strerror(rc));
267
203
return false;
268
204
}
269
205
270
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
207
if(ret == -1){
272
perror_plus("close");
208
perror("close");
273
209
}
274
210
gpgme_data_release(pgp_data);
275
211
return true;
276
212
}
277
213
278
214
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
281
216
}
282
217
283
218
/* Init GPGME */
284
219
gpgme_check_version(NULL);
285
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
221
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
223
gpgme_strsource(rc), gpgme_strerror(rc));
290
224
return false;
291
225
}
292
226
293
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
294
228
rc = gpgme_get_engine_info(&engine_info);
295
229
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
231
gpgme_strsource(rc), gpgme_strerror(rc));
299
232
return false;
300
233
}
307
240
engine_info = engine_info->next;
308
241
}
309
242
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
244
return false;
313
245
}
314
246
315
247
/* Create new GPGME "context" */
316
248
rc = gpgme_new(&(mc.ctx));
317
249
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
321
252
return false;
322
253
}
323
254
342
273
ssize_t plaintext_length = 0;
343
274
344
275
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
277
}
348
278
349
279
/* Create new GPGME data buffer from memory cryptotext */
350
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
281
0);
352
282
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
284
gpgme_strsource(rc), gpgme_strerror(rc));
356
285
return -1;
357
286
}
359
288
/* Create new empty GPGME data buffer for the plaintext */
360
289
rc = gpgme_data_new(&dh_plain);
361
290
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
292
gpgme_strsource(rc), gpgme_strerror(rc));
365
293
gpgme_data_release(dh_crypto);
366
294
return -1;
370
298
data buffer */
371
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
300
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
302
gpgme_strsource(rc), gpgme_strerror(rc));
376
303
plaintext_length = -1;
377
304
if(debug){
378
305
gpgme_decrypt_result_t result;
379
306
result = gpgme_op_decrypt_result(mc.ctx);
380
307
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
309
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
310
fprintf(stderr, "Unsupported algorithm: %s\n",
386
311
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
312
fprintf(stderr, "Wrong key usage: %u\n",
389
313
result->wrong_key_usage);
390
314
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
393
316
}
394
317
gpgme_recipient_t recipient;
395
318
recipient = result->recipients;
396
319
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
320
fprintf(stderr, "Public key algorithm: %s\n",
399
321
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",
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
404
324
recipient->status == GPG_ERR_NO_SECKEY
405
325
? "No" : "Yes");
406
326
recipient = recipient->next;
411
331
}
412
332
413
333
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
335
}
417
336
418
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
421
340
plaintext_length = -1;
422
341
goto decrypt_end;
423
342
}
428
347
(size_t)plaintext_length,
429
348
plaintext_capacity);
430
349
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
350
perror("incbuffer");
432
351
plaintext_length = -1;
433
352
goto decrypt_end;
434
353
}
441
360
break;
442
361
}
443
362
if(ret < 0){
444
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
445
364
plaintext_length = -1;
446
365
goto decrypt_end;
447
366
}
449
368
}
450
369
451
370
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
454
372
for(ssize_t i = 0; i < plaintext_length; i++){
455
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
374
}
478
396
/* GnuTLS log function callback */
479
397
static void debuggnutls(__attribute__((unused)) int level,
480
398
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
482
400
}
483
401
484
402
static int init_gnutls_global(const char *pubkeyfilename,
486
404
int ret;
487
405
488
406
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
491
408
}
492
409
493
410
ret = gnutls_global_init();
494
411
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
497
414
return -1;
498
415
}
499
416
506
423
}
507
424
508
425
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
510
427
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
513
433
gnutls_global_deinit();
514
434
return -1;
515
435
}
516
436
517
437
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
440
seckeyfilename);
522
441
}
526
445
GNUTLS_OPENPGP_FMT_BASE64);
527
446
if(ret != GNUTLS_E_SUCCESS){
528
447
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
534
452
goto globalfail;
535
453
}
536
454
537
455
/* GnuTLS server initialization */
538
456
ret = gnutls_dh_params_init(&mc.dh_params);
539
457
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
459
" %s\n", safer_gnutls_strerror(ret));
543
460
goto globalfail;
544
461
}
545
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
463
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
465
safer_gnutls_strerror(ret));
550
466
goto globalfail;
551
467
}
572
488
}
573
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
490
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
492
safer_gnutls_strerror(ret));
578
493
}
579
494
587
502
}
588
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
504
if(ret != GNUTLS_E_SUCCESS){
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));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
594
508
gnutls_deinit(*session);
595
509
return -1;
596
510
}
605
519
}
606
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
521
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
523
safer_gnutls_strerror(ret));
611
524
gnutls_deinit(*session);
612
525
return -1;
658
571
pf = PF_INET;
659
572
break;
660
573
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
663
575
errno = EINVAL;
664
576
return -1;
665
577
}
670
582
}
671
583
672
584
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
586
"\n", ip, port);
676
587
}
677
588
678
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
590
if(tcp_sd < 0){
680
591
int e = errno;
681
perror_plus("socket");
592
perror("socket");
682
593
errno = e;
683
594
goto mandos_end;
684
595
}
698
609
}
699
610
if(ret < 0 ){
700
611
int e = errno;
701
perror_plus("inet_pton");
612
perror("inet_pton");
702
613
errno = e;
703
614
goto mandos_end;
704
615
}
705
616
if(ret == 0){
706
617
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
709
619
errno = e;
710
620
goto mandos_end;
711
621
}
718
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
629
-Wunreachable-code*/
720
630
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
632
" without a network interface\n");
724
633
errno = EINVAL;
725
634
goto mandos_end;
742
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
652
char interface[IF_NAMESIZE];
744
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
654
perror("if_indextoname");
746
655
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
657
ip, interface, port);
750
658
}
751
659
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
754
662
}
755
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
671
sizeof(addrstr));
764
672
}
765
673
if(pcret == NULL){
766
perror_plus("inet_ntop");
674
perror("inet_ntop");
767
675
} else {
768
676
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
678
}
772
679
}
773
680
}
785
692
if(ret < 0){
786
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
694
int e = errno;
788
perror_plus("connect");
695
perror("connect");
789
696
errno = e;
790
697
}
791
698
goto mandos_end;
804
711
out_size - written));
805
712
if(ret == -1){
806
713
int e = errno;
807
perror_plus("write");
714
perror("write");
808
715
errno = e;
809
716
goto mandos_end;
810
717
}
827
734
}
828
735
829
736
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
832
738
}
833
739
834
740
if(quit_now){
836
742
goto mandos_end;
837
743
}
838
744
839
/* Spurious warning from -Wint-to-pointer-cast */
840
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
746
842
747
if(quit_now){
854
759
855
760
if(ret != GNUTLS_E_SUCCESS){
856
761
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
763
gnutls_perror(ret);
860
764
}
861
765
errno = EPROTO;
865
769
/* Read OpenPGP packet that contains the wanted password */
866
770
867
771
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
870
774
}
871
775
872
776
while(true){
880
784
buffer_capacity);
881
785
if(buffer_capacity == 0){
882
786
int e = errno;
883
perror_plus("incbuffer");
787
perror("incbuffer");
884
788
errno = e;
885
789
goto mandos_end;
886
790
}
910
814
}
911
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
816
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
818
gnutls_perror(ret);
916
819
errno = EPROTO;
917
820
goto mandos_end;
918
821
}
919
822
break;
920
823
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
824
fprintf(stderr, "Unknown error while reading data from"
923
825
" encrypted session with Mandos server\n");
924
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
827
errno = EIO;
931
833
}
932
834
933
835
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
936
837
}
937
838
938
839
if(quit_now){
968
869
if(ret == 0 and ferror(stdout)){
969
870
int e = errno;
970
871
if(debug){
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
872
fprintf(stderr, "Error writing encrypted data: %s\n",
973
873
strerror(errno));
974
874
}
975
875
errno = e;
995
895
if(e == 0){
996
896
e = errno;
997
897
}
998
perror_plus("close");
898
perror("close");
999
899
}
1000
900
gnutls_deinit(session);
1001
errno = e;
1002
901
if(quit_now){
1003
errno = EINTR;
902
e = EINTR;
1004
903
retval = -1;
1005
904
}
905
errno = e;
1006
906
}
1007
907
return retval;
1008
908
}
1033
933
switch(event){
1034
934
default:
1035
935
case AVAHI_RESOLVER_FAILURE:
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1038
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
938
avahi_strerror(avahi_server_errno(mc.server)));
1040
939
break;
1044
943
char ip[AVAHI_ADDRESS_STR_MAX];
1045
944
avahi_address_snprint(ip, sizeof(ip), address);
1046
945
if(debug){
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1049
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
948
ip, (intmax_t)interface, port);
1051
949
}
1053
951
avahi_proto_to_af(proto));
1054
952
if(ret == 0){
1055
953
avahi_simple_poll_quit(mc.simple_poll);
1056
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1059
954
}
1060
955
}
1061
956
}
1085
980
default:
1086
981
case AVAHI_BROWSER_FAILURE:
1087
982
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
983
fprintf(stderr, "(Avahi browser) %s\n",
1090
984
avahi_strerror(avahi_server_errno(mc.server)));
1091
985
avahi_simple_poll_quit(mc.simple_poll);
1092
986
return;
1100
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
995
name, type, domain, protocol, 0,
1102
996
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1105
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1106
999
break;
1107
1000
1111
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1113
1006
if(debug){
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1116
1008
}
1117
1009
break;
1118
1010
}
1119
1011
}
1120
1012
1121
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1122
1014
static void handle_sigterm(int sig){
1123
1015
if(quit_now){
1124
1016
return;
1126
1018
quit_now = 1;
1127
1019
signal_received = sig;
1128
1020
int old_errno = errno;
1129
/* set main loop to exit */
1130
1021
if(mc.simple_poll != NULL){
1131
1022
avahi_simple_poll_quit(mc.simple_poll);
1132
1023
}
1133
1024
errno = old_errno;
1134
1025
}
1135
1026
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1137
int ret;
1138
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
if(s < 0){
1141
perror_plus("socket");
1142
return false;
1143
}
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
if(ret == -1){
1027
/*
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.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
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){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
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){
1147
1081
if(debug){
1148
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1149
1084
}
1150
return false;
1085
free(flagstring);
1086
return 0;
1151
1087
}
1152
return true;
1153
}
1154
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1157
1090
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1159
1092
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1162
1095
}
1163
return false;
1096
return 0;
1164
1097
}
1165
1098
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1167
1100
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1170
1103
}
1171
return true;
1104
return 1;
1172
1105
}
1173
1106
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1178
}
1179
return false;
1180
}
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1183
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1186
}
1187
return false;
1188
}
1189
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1190
1114
/* Accept this device */
1191
1115
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1194
}
1195
return true;
1196
}
1197
1198
/*
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.)
1202
*/
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1205
return 0;
1206
}
1207
1208
struct ifreq ifr;
1209
if(not get_flags(if_entry->d_name, &ifr)){
1210
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
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.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1268
}
1269
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'))){
1276
return 0;
1277
}
1278
return 1;
1279
}
1280
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1283
int ret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1308
if(ret == -1){
1309
if(debug){
1310
perror_plus("Could not stat plugin");
1311
}
1312
return 0;
1313
}
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1316
return 0;
1317
}
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1326
int ret;
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1330
1331
while(true){
1332
if(mc.current_server == NULL){
1333
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1336
}
1337
ret = avahi_simple_poll_iterate(s, -1);
1338
} else {
1339
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
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));
1362
1363
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1366
}
1367
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);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(mc.simple_poll);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1396
1120
}
1397
1121
1398
1122
int main(int argc, char *argv[]){
1417
1141
bool gnutls_initialized = false;
1418
1142
bool gpgme_initialized = false;
1419
1143
float delay = 2.5f;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1422
1144
1423
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1430
1152
errno = 0;
1431
1153
ret = setgid(gid);
1432
1154
if(ret == -1){
1433
perror_plus("setgid");
1155
perror("setgid");
1434
1156
}
1435
1157
1436
1158
/* Lower user privileges (temporarily) */
1437
1159
errno = 0;
1438
1160
ret = seteuid(uid);
1439
1161
if(ret == -1){
1440
perror_plus("seteuid");
1162
perror("seteuid");
1441
1163
}
1442
1164
1443
1165
if(quit_now){
1478
1200
.arg = "SECONDS",
1479
1201
.doc = "Maximum delay to wait for interface startup",
1480
1202
.group = 2 },
1481
{ .name = "retry", .key = 132,
1482
.arg = "SECONDS",
1483
.doc = "Retry interval used when denied by the mandos server",
1484
.group = 2 },
1485
1203
/*
1486
1204
* These reproduce what we would get without ARGP_NO_HELP
1487
1205
*/
1531
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
1250
argp_error(state, "Bad delay");
1533
1251
}
1534
case 132: /* --retry */
1535
errno = 0;
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");
1541
}
1542
1252
break;
1543
1253
/*
1544
1254
* These reproduce what we would get without ARGP_NO_HELP
1551
1261
argp_state_help(state, state->out_stream,
1552
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
1263
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
1265
exit(argp_err_exit_status);
1557
1266
break;
1573
1282
case ENOMEM:
1574
1283
default:
1575
1284
errno = ret;
1576
perror_plus("argp_parse");
1285
perror("argp_parse");
1577
1286
exitcode = EX_OSERR;
1578
1287
goto end;
1579
1288
case EINVAL:
1581
1290
goto end;
1582
1291
}
1583
1292
}
1584
1585
{
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1590
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
} else {
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,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
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));
1713
free(fullname);
1714
continue;
1715
}
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,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1737
}
1738
}
1739
1293
1740
1294
if(not debug){
1741
1295
avahi_set_log_function(empty_log);
1742
1296
}
1743
1297
1744
1298
if(interface[0] == '\0'){
1745
1299
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1748
1301
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
1302
if(ret >= 1){
1756
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1757
1304
interface = strdup(direntries[0]->d_name);
1758
1305
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1761
1307
}
1762
1308
if(interface == NULL){
1763
perror_plus("malloc");
1309
perror("malloc");
1764
1310
free(direntries);
1765
1311
exitcode = EXIT_FAILURE;
1766
1312
goto end;
1768
1314
free(direntries);
1769
1315
} else {
1770
1316
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1773
1318
exitcode = EXIT_FAILURE;
1774
1319
goto end;
1775
1320
}
1781
1326
srand((unsigned int) time(NULL));
1782
1327
mc.simple_poll = avahi_simple_poll_new();
1783
1328
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1786
1330
exitcode = EX_UNAVAILABLE;
1787
1331
goto end;
1788
1332
}
1790
1334
sigemptyset(&sigterm_action.sa_mask);
1791
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1792
1336
if(ret == -1){
1793
perror_plus("sigaddset");
1337
perror("sigaddset");
1794
1338
exitcode = EX_OSERR;
1795
1339
goto end;
1796
1340
}
1797
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1798
1342
if(ret == -1){
1799
perror_plus("sigaddset");
1343
perror("sigaddset");
1800
1344
exitcode = EX_OSERR;
1801
1345
goto end;
1802
1346
}
1803
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1804
1348
if(ret == -1){
1805
perror_plus("sigaddset");
1349
perror("sigaddset");
1806
1350
exitcode = EX_OSERR;
1807
1351
goto end;
1808
1352
}
1812
1356
*/
1813
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1814
1358
if(ret == -1){
1815
perror_plus("sigaction");
1359
perror("sigaction");
1816
1360
return EX_OSERR;
1817
1361
}
1818
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1820
1364
if(ret == -1){
1821
perror_plus("sigaction");
1365
perror("sigaction");
1822
1366
exitcode = EX_OSERR;
1823
1367
goto end;
1824
1368
}
1825
1369
}
1826
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1827
1371
if(ret == -1){
1828
perror_plus("sigaction");
1372
perror("sigaction");
1829
1373
return EX_OSERR;
1830
1374
}
1831
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1833
1377
if(ret == -1){
1834
perror_plus("sigaction");
1378
perror("sigaction");
1835
1379
exitcode = EX_OSERR;
1836
1380
goto end;
1837
1381
}
1838
1382
}
1839
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1840
1384
if(ret == -1){
1841
perror_plus("sigaction");
1385
perror("sigaction");
1842
1386
return EX_OSERR;
1843
1387
}
1844
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1846
1390
if(ret == -1){
1847
perror_plus("sigaction");
1391
perror("sigaction");
1848
1392
exitcode = EX_OSERR;
1849
1393
goto end;
1850
1394
}
1854
1398
if(strcmp(interface, "none") != 0){
1855
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
1400
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1859
1402
exitcode = EX_UNAVAILABLE;
1860
1403
goto end;
1861
1404
}
1868
1411
errno = 0;
1869
1412
ret = seteuid(0);
1870
1413
if(ret == -1){
1871
perror_plus("seteuid");
1414
perror("seteuid");
1872
1415
}
1873
1416
1874
1417
#ifdef __linux__
1878
1421
bool restore_loglevel = true;
1879
1422
if(ret == -1){
1880
1423
restore_loglevel = false;
1881
perror_plus("klogctl");
1424
perror("klogctl");
1882
1425
}
1883
1426
#endif /* __linux__ */
1884
1427
1885
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
1429
if(sd < 0){
1887
perror_plus("socket");
1430
perror("socket");
1888
1431
exitcode = EX_OSERR;
1889
1432
#ifdef __linux__
1890
1433
if(restore_loglevel){
1891
1434
ret = klogctl(7, NULL, 0);
1892
1435
if(ret == -1){
1893
perror_plus("klogctl");
1436
perror("klogctl");
1894
1437
}
1895
1438
}
1896
1439
#endif /* __linux__ */
1898
1441
errno = 0;
1899
1442
ret = seteuid(uid);
1900
1443
if(ret == -1){
1901
perror_plus("seteuid");
1444
perror("seteuid");
1902
1445
}
1903
1446
goto end;
1904
1447
}
1905
1448
strcpy(network.ifr_name, interface);
1906
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
1450
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1909
1452
#ifdef __linux__
1910
1453
if(restore_loglevel){
1911
1454
ret = klogctl(7, NULL, 0);
1912
1455
if(ret == -1){
1913
perror_plus("klogctl");
1456
perror("klogctl");
1914
1457
}
1915
1458
}
1916
1459
#endif /* __linux__ */
1919
1462
errno = 0;
1920
1463
ret = seteuid(uid);
1921
1464
if(ret == -1){
1922
perror_plus("seteuid");
1465
perror("seteuid");
1923
1466
}
1924
1467
goto end;
1925
1468
}
1929
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
1473
if(ret == -1){
1931
1474
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1933
1476
exitcode = EX_OSERR;
1934
1477
#ifdef __linux__
1935
1478
if(restore_loglevel){
1936
1479
ret = klogctl(7, NULL, 0);
1937
1480
if(ret == -1){
1938
perror_plus("klogctl");
1481
perror("klogctl");
1939
1482
}
1940
1483
}
1941
1484
#endif /* __linux__ */
1943
1486
errno = 0;
1944
1487
ret = seteuid(uid);
1945
1488
if(ret == -1){
1946
perror_plus("seteuid");
1489
perror("seteuid");
1947
1490
}
1948
1491
goto end;
1949
1492
}
1950
1493
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1953
1495
for(int i=0; i < delay * 4; i++){
1954
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
1497
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1957
1499
} else if(network.ifr_flags & IFF_RUNNING){
1958
1500
break;
1959
1501
}
1960
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
1503
ret = nanosleep(&sleeptime, NULL);
1962
1504
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1505
perror("nanosleep");
1964
1506
}
1965
1507
}
1966
1508
if(not take_down_interface){
1967
1509
/* We won't need the socket anymore */
1968
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
1511
if(ret == -1){
1970
perror_plus("close");
1512
perror("close");
1971
1513
}
1972
1514
}
1973
1515
#ifdef __linux__
1975
1517
/* Restores kernel loglevel to default */
1976
1518
ret = klogctl(7, NULL, 0);
1977
1519
if(ret == -1){
1978
perror_plus("klogctl");
1520
perror("klogctl");
1979
1521
}
1980
1522
}
1981
1523
#endif /* __linux__ */
1985
1527
/* Lower privileges */
1986
1528
ret = seteuid(uid);
1987
1529
if(ret == -1){
1988
perror_plus("seteuid");
1530
perror("seteuid");
1989
1531
}
1990
1532
} else {
1991
1533
/* Lower privileges permanently */
1992
1534
ret = setuid(uid);
1993
1535
if(ret == -1){
1994
perror_plus("setuid");
1536
perror("setuid");
1995
1537
}
1996
1538
}
1997
1539
}
2002
1544
2003
1545
ret = init_gnutls_global(pubkey, seckey);
2004
1546
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2007
1548
exitcode = EX_UNAVAILABLE;
2008
1549
goto end;
2009
1550
} else {
2014
1555
goto end;
2015
1556
}
2016
1557
1558
tempdir_created = true;
2017
1559
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2019
1562
goto end;
2020
1563
}
2021
tempdir_created = true;
2022
1564
2023
1565
if(quit_now){
2024
1566
goto end;
2025
1567
}
2026
1568
2027
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2030
1571
exitcode = EX_UNAVAILABLE;
2031
1572
goto end;
2032
1573
} else {
2042
1583
/* (Mainly meant for debugging) */
2043
1584
char *address = strrchr(connect_to, ':');
2044
1585
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2047
1587
exitcode = EX_USAGE;
2048
1588
goto end;
2049
1589
}
2057
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2058
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
1599
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2062
1601
exitcode = EX_USAGE;
2063
1602
goto end;
2064
1603
}
2069
1608
2070
1609
port = (uint16_t)tmpmax;
2071
1610
*address = '\0';
1611
address = connect_to;
2072
1612
/* Colon in address indicates IPv6 */
2073
1613
int af;
2074
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2075
1615
af = AF_INET6;
2076
/* Accept [] around IPv6 address - see RFC 5952 */
2077
if(connect_to[0] == '[' and address[-1] == ']')
2078
{
2079
connect_to++;
2080
address[-1] = '\0';
2081
}
2082
1616
} else {
2083
1617
af = AF_INET;
2084
1618
}
2085
address = connect_to;
2086
1619
2087
1620
if(quit_now){
2088
1621
goto end;
2089
1622
}
2090
1623
2091
1624
while(not quit_now){
2092
1625
ret = start_mandos_communication(address, port, if_index, af);
2093
1626
if(quit_now or ret == 0){
2094
1627
break;
2095
1628
}
2096
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2099
}
2100
sleep((int)retry_interval);
2101
}
2102
1629
sleep(15);
1630
};
1631
2103
1632
if (not quit_now){
2104
1633
exitcode = EXIT_SUCCESS;
2105
1634
}
2106
1635
2107
1636
goto end;
2108
1637
}
2109
1638
2131
1660
2132
1661
/* Check if creating the Avahi server object succeeded */
2133
1662
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
2136
1664
avahi_strerror(error));
2137
1665
exitcode = EX_UNAVAILABLE;
2138
1666
goto end;
2147
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
1676
NULL, 0, browse_callback, NULL);
2149
1677
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
1678
fprintf(stderr, "Failed to create service browser: %s\n",
2152
1679
avahi_strerror(avahi_server_errno(mc.server)));
2153
1680
exitcode = EX_UNAVAILABLE;
2154
1681
goto end;
2161
1688
/* Run the main loop */
2162
1689
2163
1690
if(debug){
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2166
}
2167
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2170
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2174
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2175
1695
2176
1696
end:
2177
1697
2178
1698
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2181
1700
}
2182
1701
2183
1702
/* Cleanup things */
2199
1718
if(gpgme_initialized){
2200
1719
gpgme_release(mc.ctx);
2201
1720
}
2202
2203
/* Cleans up the circular linked list of Mandos servers the client
2204
has seen */
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;
2211
}
2212
}
2213
2214
/* XXX run network hooks "stop" here */
2215
1721
2216
1722
/* Take down the network interface */
2217
1723
if(take_down_interface){
2219
1725
errno = 0;
2220
1726
ret = seteuid(0);
2221
1727
if(ret == -1){
2222
perror_plus("seteuid");
1728
perror("seteuid");
2223
1729
}
2224
1730
if(geteuid() == 0){
2225
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
1732
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2229
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
1737
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2233
1739
}
2234
1740
}
2235
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
1742
if(ret == -1){
2237
perror_plus("close");
1743
perror("close");
2238
1744
}
2239
1745
/* Lower privileges permanently */
2240
1746
errno = 0;
2241
1747
ret = setuid(uid);
2242
1748
if(ret == -1){
2243
perror_plus("setuid");
1749
perror("setuid");
2244
1750
}
2245
1751
}
2246
1752
}
2247
1753
2248
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2249
1755
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2253
alphasort);
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2257
1776
char *fullname = NULL;
2258
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2259
1778
direntry->d_name);
2260
1779
if(ret < 0){
2261
perror_plus("asprintf");
1780
perror("asprintf");
2262
1781
continue;
2263
1782
}
2264
1783
ret = remove(fullname);
2265
1784
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2268
1787
}
2269
1788
free(fullname);
2270
1789
}
2271
}
2272
2273
/* need to clean even if 0 because man page doesn't specify */
2274
free(direntries);
2275
if (numentries == -1){
2276
perror_plus("scandir");
1790
closedir(d);
2277
1791
}
2278
1792
ret = rmdir(tempdir);
2279
1793
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
1794
perror("rmdir");
2281
1795
}
2282
1796
}
2283
1797
2288
1802
&old_sigterm_action,
2289
1803
NULL));
2290
1804
if(ret == -1){
2291
perror_plus("sigaction");
1805
perror("sigaction");
2292
1806
}
2293
1807
do {
2294
1808
ret = raise(signal_received);
2295
1809
} while(ret != 0 and errno == EINTR);
2296
1810
if(ret != 0){
2297
perror_plus("raise");
1811
perror("raise");
2298
1812
abort();
2299
1813
}
2300
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0