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» Revision
24.1.157
(compared to revision 237.16.3)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2010-09-07 18:48:56 UTC
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100907184856-waz6cvxbm7ranha2
added the actually plugin file for plymouth
- files added:
- plugins.d/plymouth
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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 */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
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>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
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;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
130
148
131
/* Used for passing in values through the Avahi callback functions */
149
132
typedef struct {
154
137
gnutls_dh_params_t dh_params;
155
138
const char *priority;
156
139
gpgme_ctx_t ctx;
157
server *current_server;
158
140
} mandos_context;
159
141
160
142
/* global context so signal handler can reach it*/
161
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
144
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
146
166
147
sig_atomic_t quit_now = 0;
167
148
int signal_received = 0;
168
149
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
150
/*
177
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
152
* bytes. "buffer_capacity" is how much is currently allocated,
190
164
return buffer_capacity;
191
165
}
192
166
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
167
/*
232
168
* Initialize GPGME.
233
169
*/
247
183
248
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
185
if(fd == -1){
250
perror_plus("open");
186
perror("open");
251
187
return false;
252
188
}
253
189
254
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
191
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
193
gpgme_strsource(rc), gpgme_strerror(rc));
259
194
return false;
260
195
}
261
196
262
197
rc = gpgme_op_import(mc.ctx, pgp_data);
263
198
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
200
gpgme_strsource(rc), gpgme_strerror(rc));
267
201
return false;
268
202
}
269
203
270
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
205
if(ret == -1){
272
perror_plus("close");
206
perror("close");
273
207
}
274
208
gpgme_data_release(pgp_data);
275
209
return true;
276
210
}
277
211
278
212
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
281
214
}
282
215
283
216
/* Init GPGME */
284
217
gpgme_check_version(NULL);
285
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
219
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
221
gpgme_strsource(rc), gpgme_strerror(rc));
290
222
return false;
291
223
}
292
224
293
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
294
226
rc = gpgme_get_engine_info(&engine_info);
295
227
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
229
gpgme_strsource(rc), gpgme_strerror(rc));
299
230
return false;
300
231
}
307
238
engine_info = engine_info->next;
308
239
}
309
240
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
242
return false;
313
243
}
314
244
315
245
/* Create new GPGME "context" */
316
246
rc = gpgme_new(&(mc.ctx));
317
247
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));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
321
250
return false;
322
251
}
323
252
342
271
ssize_t plaintext_length = 0;
343
272
344
273
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
275
}
348
276
349
277
/* Create new GPGME data buffer from memory cryptotext */
350
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
279
0);
352
280
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
282
gpgme_strsource(rc), gpgme_strerror(rc));
356
283
return -1;
357
284
}
359
286
/* Create new empty GPGME data buffer for the plaintext */
360
287
rc = gpgme_data_new(&dh_plain);
361
288
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
290
gpgme_strsource(rc), gpgme_strerror(rc));
365
291
gpgme_data_release(dh_crypto);
366
292
return -1;
370
296
data buffer */
371
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
298
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
300
gpgme_strsource(rc), gpgme_strerror(rc));
376
301
plaintext_length = -1;
377
302
if(debug){
378
303
gpgme_decrypt_result_t result;
379
304
result = gpgme_op_decrypt_result(mc.ctx);
380
305
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
307
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
308
fprintf(stderr, "Unsupported algorithm: %s\n",
386
309
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
310
fprintf(stderr, "Wrong key usage: %u\n",
389
311
result->wrong_key_usage);
390
312
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
393
314
}
394
315
gpgme_recipient_t recipient;
395
316
recipient = result->recipients;
396
317
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
318
fprintf(stderr, "Public key algorithm: %s\n",
399
319
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",
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
404
322
recipient->status == GPG_ERR_NO_SECKEY
405
323
? "No" : "Yes");
406
324
recipient = recipient->next;
411
329
}
412
330
413
331
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
333
}
417
334
418
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
421
338
plaintext_length = -1;
422
339
goto decrypt_end;
423
340
}
428
345
(size_t)plaintext_length,
429
346
plaintext_capacity);
430
347
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
348
perror("incbuffer");
432
349
plaintext_length = -1;
433
350
goto decrypt_end;
434
351
}
441
358
break;
442
359
}
443
360
if(ret < 0){
444
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
445
362
plaintext_length = -1;
446
363
goto decrypt_end;
447
364
}
449
366
}
450
367
451
368
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
454
370
for(ssize_t i = 0; i < plaintext_length; i++){
455
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
372
}
478
394
/* GnuTLS log function callback */
479
395
static void debuggnutls(__attribute__((unused)) int level,
480
396
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
482
398
}
483
399
484
400
static int init_gnutls_global(const char *pubkeyfilename,
486
402
int ret;
487
403
488
404
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
491
406
}
492
407
493
408
ret = gnutls_global_init();
494
409
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
497
412
return -1;
498
413
}
499
414
506
421
}
507
422
508
423
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
510
425
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
513
431
gnutls_global_deinit();
514
432
return -1;
515
433
}
516
434
517
435
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
438
seckeyfilename);
522
439
}
526
443
GNUTLS_OPENPGP_FMT_BASE64);
527
444
if(ret != GNUTLS_E_SUCCESS){
528
445
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
534
450
goto globalfail;
535
451
}
536
452
537
453
/* GnuTLS server initialization */
538
454
ret = gnutls_dh_params_init(&mc.dh_params);
539
455
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
457
" %s\n", safer_gnutls_strerror(ret));
543
458
goto globalfail;
544
459
}
545
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
461
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
463
safer_gnutls_strerror(ret));
550
464
goto globalfail;
551
465
}
572
486
}
573
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
488
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
490
safer_gnutls_strerror(ret));
578
491
}
579
492
587
500
}
588
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
502
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));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
594
506
gnutls_deinit(*session);
595
507
return -1;
596
508
}
605
517
}
606
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
519
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
521
safer_gnutls_strerror(ret));
611
522
gnutls_deinit(*session);
612
523
return -1;
658
569
pf = PF_INET;
659
570
break;
660
571
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
663
573
errno = EINVAL;
664
574
return -1;
665
575
}
670
580
}
671
581
672
582
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
584
"\n", ip, port);
676
585
}
677
586
678
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
588
if(tcp_sd < 0){
680
589
int e = errno;
681
perror_plus("socket");
590
perror("socket");
682
591
errno = e;
683
592
goto mandos_end;
684
593
}
698
607
}
699
608
if(ret < 0 ){
700
609
int e = errno;
701
perror_plus("inet_pton");
610
perror("inet_pton");
702
611
errno = e;
703
612
goto mandos_end;
704
613
}
705
614
if(ret == 0){
706
615
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
709
617
errno = e;
710
618
goto mandos_end;
711
619
}
718
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
627
-Wunreachable-code*/
720
628
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
630
" without a network interface\n");
724
631
errno = EINVAL;
725
632
goto mandos_end;
742
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
650
char interface[IF_NAMESIZE];
744
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
652
perror("if_indextoname");
746
653
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
655
ip, interface, port);
750
656
}
751
657
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
754
660
}
755
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
669
sizeof(addrstr));
764
670
}
765
671
if(pcret == NULL){
766
perror_plus("inet_ntop");
672
perror("inet_ntop");
767
673
} else {
768
674
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
676
}
772
677
}
773
678
}
783
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
689
}
785
690
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
691
int e = errno;
692
perror("connect");
693
errno = e;
791
694
goto mandos_end;
792
695
}
793
696
804
707
out_size - written));
805
708
if(ret == -1){
806
709
int e = errno;
807
perror_plus("write");
710
perror("write");
808
711
errno = e;
809
712
goto mandos_end;
810
713
}
827
730
}
828
731
829
732
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
832
734
}
833
735
834
736
if(quit_now){
836
738
goto mandos_end;
837
739
}
838
740
839
/* Spurious warning from -Wint-to-pointer-cast */
840
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
742
842
743
if(quit_now){
854
755
855
756
if(ret != GNUTLS_E_SUCCESS){
856
757
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
759
gnutls_perror(ret);
860
760
}
861
761
errno = EPROTO;
865
765
/* Read OpenPGP packet that contains the wanted password */
866
766
867
767
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
870
770
}
871
771
872
772
while(true){
880
780
buffer_capacity);
881
781
if(buffer_capacity == 0){
882
782
int e = errno;
883
perror_plus("incbuffer");
783
perror("incbuffer");
884
784
errno = e;
885
785
goto mandos_end;
886
786
}
910
810
}
911
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
812
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
814
gnutls_perror(ret);
916
815
errno = EPROTO;
917
816
goto mandos_end;
918
817
}
919
818
break;
920
819
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
820
fprintf(stderr, "Unknown error while reading data from"
923
821
" encrypted session with Mandos server\n");
924
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
823
errno = EIO;
931
829
}
932
830
933
831
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
936
833
}
937
834
938
835
if(quit_now){
968
865
if(ret == 0 and ferror(stdout)){
969
866
int e = errno;
970
867
if(debug){
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
868
fprintf(stderr, "Error writing encrypted data: %s\n",
973
869
strerror(errno));
974
870
}
975
871
errno = e;
995
891
if(e == 0){
996
892
e = errno;
997
893
}
998
perror_plus("close");
894
perror("close");
999
895
}
1000
896
gnutls_deinit(session);
1001
errno = e;
1002
897
if(quit_now){
1003
errno = EINTR;
898
e = EINTR;
1004
899
retval = -1;
1005
900
}
901
errno = e;
1006
902
}
1007
903
return retval;
1008
904
}
1033
929
switch(event){
1034
930
default:
1035
931
case AVAHI_RESOLVER_FAILURE:
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1038
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
934
avahi_strerror(avahi_server_errno(mc.server)));
1040
935
break;
1044
939
char ip[AVAHI_ADDRESS_STR_MAX];
1045
940
avahi_address_snprint(ip, sizeof(ip), address);
1046
941
if(debug){
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1049
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
944
ip, (intmax_t)interface, port);
1051
945
}
1053
947
avahi_proto_to_af(proto));
1054
948
if(ret == 0){
1055
949
avahi_simple_poll_quit(mc.simple_poll);
1056
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1059
950
}
1060
951
}
1061
952
}
1085
976
default:
1086
977
case AVAHI_BROWSER_FAILURE:
1087
978
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
979
fprintf(stderr, "(Avahi browser) %s\n",
1090
980
avahi_strerror(avahi_server_errno(mc.server)));
1091
981
avahi_simple_poll_quit(mc.simple_poll);
1092
982
return;
1100
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
991
name, type, domain, protocol, 0,
1102
992
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1105
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1106
995
break;
1107
996
1111
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1113
1002
if(debug){
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1116
1004
}
1117
1005
break;
1118
1006
}
1119
1007
}
1120
1008
1121
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1122
1010
static void handle_sigterm(int sig){
1123
1011
if(quit_now){
1124
1012
return;
1126
1014
quit_now = 1;
1127
1015
signal_received = sig;
1128
1016
int old_errno = errno;
1129
/* set main loop to exit */
1130
1017
if(mc.simple_poll != NULL){
1131
1018
avahi_simple_poll_quit(mc.simple_poll);
1132
1019
}
1133
1020
errno = old_errno;
1134
1021
}
1135
1022
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){
1147
if(debug){
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
}
1150
return false;
1151
}
1152
return true;
1153
}
1154
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1170
}
1171
return true;
1172
}
1173
/* 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
1190
/* Accept this device */
1191
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
}
1396
}
1397
1398
1023
int main(int argc, char *argv[]){
1399
1024
AvahiSServiceBrowser *sb = NULL;
1400
1025
int error;
1402
1027
intmax_t tmpmax;
1403
1028
char *tmp;
1404
1029
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
1030
const char *interface = "eth0";
1406
1031
struct ifreq network;
1407
1032
int sd = -1;
1408
1033
bool take_down_interface = false;
1409
1034
uid_t uid;
1410
1035
gid_t gid;
1036
char *connect_to = NULL;
1411
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1412
1038
bool tempdir_created = false;
1413
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1417
1043
bool gnutls_initialized = false;
1418
1044
bool gpgme_initialized = false;
1419
1045
float delay = 2.5f;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1422
1046
1423
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1424
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1430
1054
errno = 0;
1431
1055
ret = setgid(gid);
1432
1056
if(ret == -1){
1433
perror_plus("setgid");
1057
perror("setgid");
1434
1058
}
1435
1059
1436
1060
/* Lower user privileges (temporarily) */
1437
1061
errno = 0;
1438
1062
ret = seteuid(uid);
1439
1063
if(ret == -1){
1440
perror_plus("seteuid");
1064
perror("seteuid");
1441
1065
}
1442
1066
1443
1067
if(quit_now){
1478
1102
.arg = "SECONDS",
1479
1103
.doc = "Maximum delay to wait for interface startup",
1480
1104
.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
1105
/*
1486
1106
* These reproduce what we would get without ARGP_NO_HELP
1487
1107
*/
1531
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
1152
argp_error(state, "Bad delay");
1533
1153
}
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
1154
break;
1543
1155
/*
1544
1156
* These reproduce what we would get without ARGP_NO_HELP
1551
1163
argp_state_help(state, state->out_stream,
1552
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
1165
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
1167
exit(argp_err_exit_status);
1557
1168
break;
1573
1184
case ENOMEM:
1574
1185
default:
1575
1186
errno = ret;
1576
perror_plus("argp_parse");
1187
perror("argp_parse");
1577
1188
exitcode = EX_OSERR;
1578
1189
goto end;
1579
1190
case EINVAL:
1581
1192
goto end;
1582
1193
}
1583
1194
}
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
1195
1740
1196
if(not debug){
1741
1197
avahi_set_log_function(empty_log);
1742
1198
}
1743
1199
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
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
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1774
goto end;
1775
}
1776
}
1777
1778
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
1201
from the signal handler */
1780
1202
/* Initialize the pseudo-RNG for Avahi */
1781
1203
srand((unsigned int) time(NULL));
1782
1204
mc.simple_poll = avahi_simple_poll_new();
1783
1205
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1786
1207
exitcode = EX_UNAVAILABLE;
1787
1208
goto end;
1788
1209
}
1790
1211
sigemptyset(&sigterm_action.sa_mask);
1791
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1792
1213
if(ret == -1){
1793
perror_plus("sigaddset");
1214
perror("sigaddset");
1794
1215
exitcode = EX_OSERR;
1795
1216
goto end;
1796
1217
}
1797
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1798
1219
if(ret == -1){
1799
perror_plus("sigaddset");
1220
perror("sigaddset");
1800
1221
exitcode = EX_OSERR;
1801
1222
goto end;
1802
1223
}
1803
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1804
1225
if(ret == -1){
1805
perror_plus("sigaddset");
1226
perror("sigaddset");
1806
1227
exitcode = EX_OSERR;
1807
1228
goto end;
1808
1229
}
1812
1233
*/
1813
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1814
1235
if(ret == -1){
1815
perror_plus("sigaction");
1236
perror("sigaction");
1816
1237
return EX_OSERR;
1817
1238
}
1818
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1820
1241
if(ret == -1){
1821
perror_plus("sigaction");
1242
perror("sigaction");
1822
1243
exitcode = EX_OSERR;
1823
1244
goto end;
1824
1245
}
1825
1246
}
1826
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1827
1248
if(ret == -1){
1828
perror_plus("sigaction");
1249
perror("sigaction");
1829
1250
return EX_OSERR;
1830
1251
}
1831
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1833
1254
if(ret == -1){
1834
perror_plus("sigaction");
1255
perror("sigaction");
1835
1256
exitcode = EX_OSERR;
1836
1257
goto end;
1837
1258
}
1838
1259
}
1839
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1840
1261
if(ret == -1){
1841
perror_plus("sigaction");
1262
perror("sigaction");
1842
1263
return EX_OSERR;
1843
1264
}
1844
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1846
1267
if(ret == -1){
1847
perror_plus("sigaction");
1268
perror("sigaction");
1848
1269
exitcode = EX_OSERR;
1849
1270
goto end;
1850
1271
}
1851
1272
}
1852
1273
1853
1274
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1855
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
1277
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1859
1279
exitcode = EX_UNAVAILABLE;
1860
1280
goto end;
1861
1281
}
1868
1288
errno = 0;
1869
1289
ret = seteuid(0);
1870
1290
if(ret == -1){
1871
perror_plus("seteuid");
1291
perror("seteuid");
1872
1292
}
1873
1293
1874
1294
#ifdef __linux__
1878
1298
bool restore_loglevel = true;
1879
1299
if(ret == -1){
1880
1300
restore_loglevel = false;
1881
perror_plus("klogctl");
1301
perror("klogctl");
1882
1302
}
1883
1303
#endif /* __linux__ */
1884
1304
1885
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
1306
if(sd < 0){
1887
perror_plus("socket");
1307
perror("socket");
1888
1308
exitcode = EX_OSERR;
1889
1309
#ifdef __linux__
1890
1310
if(restore_loglevel){
1891
1311
ret = klogctl(7, NULL, 0);
1892
1312
if(ret == -1){
1893
perror_plus("klogctl");
1313
perror("klogctl");
1894
1314
}
1895
1315
}
1896
1316
#endif /* __linux__ */
1898
1318
errno = 0;
1899
1319
ret = seteuid(uid);
1900
1320
if(ret == -1){
1901
perror_plus("seteuid");
1321
perror("seteuid");
1902
1322
}
1903
1323
goto end;
1904
1324
}
1905
1325
strcpy(network.ifr_name, interface);
1906
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
1327
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1909
1329
#ifdef __linux__
1910
1330
if(restore_loglevel){
1911
1331
ret = klogctl(7, NULL, 0);
1912
1332
if(ret == -1){
1913
perror_plus("klogctl");
1333
perror("klogctl");
1914
1334
}
1915
1335
}
1916
1336
#endif /* __linux__ */
1919
1339
errno = 0;
1920
1340
ret = seteuid(uid);
1921
1341
if(ret == -1){
1922
perror_plus("seteuid");
1342
perror("seteuid");
1923
1343
}
1924
1344
goto end;
1925
1345
}
1929
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
1350
if(ret == -1){
1931
1351
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1933
1353
exitcode = EX_OSERR;
1934
1354
#ifdef __linux__
1935
1355
if(restore_loglevel){
1936
1356
ret = klogctl(7, NULL, 0);
1937
1357
if(ret == -1){
1938
perror_plus("klogctl");
1358
perror("klogctl");
1939
1359
}
1940
1360
}
1941
1361
#endif /* __linux__ */
1943
1363
errno = 0;
1944
1364
ret = seteuid(uid);
1945
1365
if(ret == -1){
1946
perror_plus("seteuid");
1366
perror("seteuid");
1947
1367
}
1948
1368
goto end;
1949
1369
}
1950
1370
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1953
1372
for(int i=0; i < delay * 4; i++){
1954
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
1374
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1957
1376
} else if(network.ifr_flags & IFF_RUNNING){
1958
1377
break;
1959
1378
}
1960
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
1380
ret = nanosleep(&sleeptime, NULL);
1962
1381
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1382
perror("nanosleep");
1964
1383
}
1965
1384
}
1966
1385
if(not take_down_interface){
1967
1386
/* We won't need the socket anymore */
1968
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
1388
if(ret == -1){
1970
perror_plus("close");
1389
perror("close");
1971
1390
}
1972
1391
}
1973
1392
#ifdef __linux__
1975
1394
/* Restores kernel loglevel to default */
1976
1395
ret = klogctl(7, NULL, 0);
1977
1396
if(ret == -1){
1978
perror_plus("klogctl");
1397
perror("klogctl");
1979
1398
}
1980
1399
}
1981
1400
#endif /* __linux__ */
1985
1404
/* Lower privileges */
1986
1405
ret = seteuid(uid);
1987
1406
if(ret == -1){
1988
perror_plus("seteuid");
1407
perror("seteuid");
1989
1408
}
1990
1409
} else {
1991
1410
/* Lower privileges permanently */
1992
1411
ret = setuid(uid);
1993
1412
if(ret == -1){
1994
perror_plus("setuid");
1413
perror("setuid");
1995
1414
}
1996
1415
}
1997
1416
}
2002
1421
2003
1422
ret = init_gnutls_global(pubkey, seckey);
2004
1423
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2007
1425
exitcode = EX_UNAVAILABLE;
2008
1426
goto end;
2009
1427
} else {
2014
1432
goto end;
2015
1433
}
2016
1434
1435
tempdir_created = true;
2017
1436
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2019
1439
goto end;
2020
1440
}
2021
tempdir_created = true;
2022
1441
2023
1442
if(quit_now){
2024
1443
goto end;
2025
1444
}
2026
1445
2027
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2030
1448
exitcode = EX_UNAVAILABLE;
2031
1449
goto end;
2032
1450
} else {
2042
1460
/* (Mainly meant for debugging) */
2043
1461
char *address = strrchr(connect_to, ':');
2044
1462
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2047
1464
exitcode = EX_USAGE;
2048
1465
goto end;
2049
1466
}
2057
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2058
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
1476
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
1477
fprintf(stderr, "Bad port number\n");
2062
1478
exitcode = EX_USAGE;
2063
1479
goto end;
2064
1480
}
2069
1485
2070
1486
port = (uint16_t)tmpmax;
2071
1487
*address = '\0';
1488
address = connect_to;
2072
1489
/* Colon in address indicates IPv6 */
2073
1490
int af;
2074
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2075
1492
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
1493
} else {
2083
1494
af = AF_INET;
2084
1495
}
2085
address = connect_to;
2086
1496
2087
1497
if(quit_now){
2088
1498
goto end;
2089
1499
}
2090
1500
2091
while(not quit_now){
2092
ret = start_mandos_communication(address, port, if_index, af);
2093
if(quit_now or ret == 0){
2094
break;
2095
}
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
2103
if (not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2104
1523
exitcode = EXIT_SUCCESS;
2105
1524
}
2106
2107
1525
goto end;
2108
1526
}
2109
1527
2131
1549
2132
1550
/* Check if creating the Avahi server object succeeded */
2133
1551
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2136
1553
avahi_strerror(error));
2137
1554
exitcode = EX_UNAVAILABLE;
2138
1555
goto end;
2147
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
1565
NULL, 0, browse_callback, NULL);
2149
1566
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2152
1568
avahi_strerror(avahi_server_errno(mc.server)));
2153
1569
exitcode = EX_UNAVAILABLE;
2154
1570
goto end;
2161
1577
/* Run the main loop */
2162
1578
2163
1579
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
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2175
1584
2176
1585
end:
2177
1586
2178
1587
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2181
1589
}
2182
1590
2183
1591
/* Cleanup things */
2199
1607
if(gpgme_initialized){
2200
1608
gpgme_release(mc.ctx);
2201
1609
}
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
1610
2216
1611
/* Take down the network interface */
2217
1612
if(take_down_interface){
2219
1614
errno = 0;
2220
1615
ret = seteuid(0);
2221
1616
if(ret == -1){
2222
perror_plus("seteuid");
1617
perror("seteuid");
2223
1618
}
2224
1619
if(geteuid() == 0){
2225
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
1621
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2229
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
1626
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2233
1628
}
2234
1629
}
2235
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
1631
if(ret == -1){
2237
perror_plus("close");
1632
perror("close");
2238
1633
}
2239
1634
/* Lower privileges permanently */
2240
1635
errno = 0;
2241
1636
ret = setuid(uid);
2242
1637
if(ret == -1){
2243
perror_plus("setuid");
1638
perror("setuid");
2244
1639
}
2245
1640
}
2246
1641
}
2247
1642
2248
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2249
1644
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];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2257
1665
char *fullname = NULL;
2258
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2259
1667
direntry->d_name);
2260
1668
if(ret < 0){
2261
perror_plus("asprintf");
1669
perror("asprintf");
2262
1670
continue;
2263
1671
}
2264
1672
ret = remove(fullname);
2265
1673
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2268
1676
}
2269
1677
free(fullname);
2270
1678
}
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");
1679
closedir(d);
2277
1680
}
2278
1681
ret = rmdir(tempdir);
2279
1682
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
1683
perror("rmdir");
2281
1684
}
2282
1685
}
2283
1686
2288
1691
&old_sigterm_action,
2289
1692
NULL));
2290
1693
if(ret == -1){
2291
perror_plus("sigaction");
1694
perror("sigaction");
2292
1695
}
2293
1696
do {
2294
1697
ret = raise(signal_received);
2295
1698
} while(ret != 0 and errno == EINTR);
2296
1699
if(ret != 0){
2297
perror_plus("raise");
1700
perror("raise");
2298
1701
abort();
2299
1702
}
2300
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0