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237.2.216
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2010-10-02 17:41:05 UTC
- mto: (24.1.169 mandos)
- mto: This revision was merged to the branch mainline in revision 274.
- Revision ID: teddy@fukt.bsnet.se-20101002174105-xfqa0j8y1puvedo3
* debian/source/format: New; contains "3.0 (quilt)".
- files removed:
- debian/source/local-options
- files modified:
- DBUS-API
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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 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 */
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
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
148
132
149
133
/* Used for passing in values through the Avahi callback functions */
150
134
typedef struct {
155
139
gnutls_dh_params_t dh_params;
156
140
const char *priority;
157
141
gpgme_ctx_t ctx;
158
server *current_server;
159
142
} mandos_context;
160
143
161
144
/* global context so signal handler can reach it*/
162
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
146
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
148
167
149
sig_atomic_t quit_now = 0;
168
150
int signal_received = 0;
169
151
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
152
/*
178
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
154
* bytes. "buffer_capacity" is how much is currently allocated,
191
166
return buffer_capacity;
192
167
}
193
168
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
232
169
/*
233
170
* Initialize GPGME.
234
171
*/
248
185
249
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
250
187
if(fd == -1){
251
perror_plus("open");
188
perror("open");
252
189
return false;
253
190
}
254
191
255
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
193
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
259
195
gpgme_strsource(rc), gpgme_strerror(rc));
260
196
return false;
261
197
}
262
198
263
199
rc = gpgme_op_import(mc.ctx, pgp_data);
264
200
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
267
202
gpgme_strsource(rc), gpgme_strerror(rc));
268
203
return false;
269
204
}
270
205
271
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
207
if(ret == -1){
273
perror_plus("close");
208
perror("close");
274
209
}
275
210
gpgme_data_release(pgp_data);
276
211
return true;
277
212
}
278
213
279
214
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
282
216
}
283
217
284
218
/* Init GPGME */
285
219
gpgme_check_version(NULL);
286
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
221
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
223
gpgme_strsource(rc), gpgme_strerror(rc));
291
224
return false;
292
225
}
293
226
294
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
295
228
rc = gpgme_get_engine_info(&engine_info);
296
229
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
231
gpgme_strsource(rc), gpgme_strerror(rc));
300
232
return false;
301
233
}
308
240
engine_info = engine_info->next;
309
241
}
310
242
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
313
244
return false;
314
245
}
315
246
316
247
/* Create new GPGME "context" */
317
248
rc = gpgme_new(&(mc.ctx));
318
249
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
322
252
return false;
323
253
}
324
254
343
273
ssize_t plaintext_length = 0;
344
274
345
275
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
277
}
349
278
350
279
/* Create new GPGME data buffer from memory cryptotext */
351
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
281
0);
353
282
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
356
284
gpgme_strsource(rc), gpgme_strerror(rc));
357
285
return -1;
358
286
}
360
288
/* Create new empty GPGME data buffer for the plaintext */
361
289
rc = gpgme_data_new(&dh_plain);
362
290
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
365
292
gpgme_strsource(rc), gpgme_strerror(rc));
366
293
gpgme_data_release(dh_crypto);
367
294
return -1;
371
298
data buffer */
372
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
300
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
302
gpgme_strsource(rc), gpgme_strerror(rc));
377
303
plaintext_length = -1;
378
304
if(debug){
379
305
gpgme_decrypt_result_t result;
380
306
result = gpgme_op_decrypt_result(mc.ctx);
381
307
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
309
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
310
fprintf(stderr, "Unsupported algorithm: %s\n",
387
311
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
312
fprintf(stderr, "Wrong key usage: %u\n",
390
313
result->wrong_key_usage);
391
314
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
394
316
}
395
317
gpgme_recipient_t recipient;
396
318
recipient = result->recipients;
397
319
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
320
fprintf(stderr, "Public key algorithm: %s\n",
400
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
405
324
recipient->status == GPG_ERR_NO_SECKEY
406
325
? "No" : "Yes");
407
326
recipient = recipient->next;
412
331
}
413
332
414
333
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
335
}
418
336
419
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
422
340
plaintext_length = -1;
423
341
goto decrypt_end;
424
342
}
429
347
(size_t)plaintext_length,
430
348
plaintext_capacity);
431
349
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
350
perror("incbuffer");
433
351
plaintext_length = -1;
434
352
goto decrypt_end;
435
353
}
442
360
break;
443
361
}
444
362
if(ret < 0){
445
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
446
364
plaintext_length = -1;
447
365
goto decrypt_end;
448
366
}
450
368
}
451
369
452
370
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
455
372
for(ssize_t i = 0; i < plaintext_length; i++){
456
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
374
}
479
396
/* GnuTLS log function callback */
480
397
static void debuggnutls(__attribute__((unused)) int level,
481
398
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
483
400
}
484
401
485
402
static int init_gnutls_global(const char *pubkeyfilename,
487
404
int ret;
488
405
489
406
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
492
408
}
493
409
494
410
ret = gnutls_global_init();
495
411
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
498
414
return -1;
499
415
}
500
416
507
423
}
508
424
509
425
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
511
427
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"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));
514
433
gnutls_global_deinit();
515
434
return -1;
516
435
}
517
436
518
437
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
521
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
440
seckeyfilename);
523
441
}
527
445
GNUTLS_OPENPGP_FMT_BASE64);
528
446
if(ret != GNUTLS_E_SUCCESS){
529
447
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
535
452
goto globalfail;
536
453
}
537
454
538
455
/* GnuTLS server initialization */
539
456
ret = gnutls_dh_params_init(&mc.dh_params);
540
457
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
543
459
" %s\n", safer_gnutls_strerror(ret));
544
460
goto globalfail;
545
461
}
546
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
463
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
550
465
safer_gnutls_strerror(ret));
551
466
goto globalfail;
552
467
}
573
488
}
574
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
490
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
492
safer_gnutls_strerror(ret));
579
493
}
580
494
588
502
}
589
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
504
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"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));
595
508
gnutls_deinit(*session);
596
509
return -1;
597
510
}
606
519
}
607
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
521
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
523
safer_gnutls_strerror(ret));
612
524
gnutls_deinit(*session);
613
525
return -1;
659
571
pf = PF_INET;
660
572
break;
661
573
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
664
575
errno = EINVAL;
665
576
return -1;
666
577
}
671
582
}
672
583
673
584
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
676
586
"\n", ip, port);
677
587
}
678
588
679
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
590
if(tcp_sd < 0){
681
591
int e = errno;
682
perror_plus("socket");
592
perror("socket");
683
593
errno = e;
684
594
goto mandos_end;
685
595
}
699
609
}
700
610
if(ret < 0 ){
701
611
int e = errno;
702
perror_plus("inet_pton");
612
perror("inet_pton");
703
613
errno = e;
704
614
goto mandos_end;
705
615
}
706
616
if(ret == 0){
707
617
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
710
619
errno = e;
711
620
goto mandos_end;
712
621
}
719
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
629
-Wunreachable-code*/
721
630
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
724
632
" without a network interface\n");
725
633
errno = EINVAL;
726
634
goto mandos_end;
743
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
652
char interface[IF_NAMESIZE];
745
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
654
perror("if_indextoname");
747
655
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
750
657
ip, interface, port);
751
658
}
752
659
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
755
662
}
756
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
764
671
sizeof(addrstr));
765
672
}
766
673
if(pcret == NULL){
767
perror_plus("inet_ntop");
674
perror("inet_ntop");
768
675
} else {
769
676
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
678
}
773
679
}
774
680
}
786
692
if(ret < 0){
787
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
694
int e = errno;
789
perror_plus("connect");
695
perror("connect");
790
696
errno = e;
791
697
}
792
698
goto mandos_end;
805
711
out_size - written));
806
712
if(ret == -1){
807
713
int e = errno;
808
perror_plus("write");
714
perror("write");
809
715
errno = e;
810
716
goto mandos_end;
811
717
}
828
734
}
829
735
830
736
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
833
738
}
834
739
835
740
if(quit_now){
837
742
goto mandos_end;
838
743
}
839
744
840
/* Spurious warning from -Wint-to-pointer-cast */
841
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
746
843
747
if(quit_now){
855
759
856
760
if(ret != GNUTLS_E_SUCCESS){
857
761
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
860
763
gnutls_perror(ret);
861
764
}
862
765
errno = EPROTO;
866
769
/* Read OpenPGP packet that contains the wanted password */
867
770
868
771
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
871
774
}
872
775
873
776
while(true){
881
784
buffer_capacity);
882
785
if(buffer_capacity == 0){
883
786
int e = errno;
884
perror_plus("incbuffer");
787
perror("incbuffer");
885
788
errno = e;
886
789
goto mandos_end;
887
790
}
911
814
}
912
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
816
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
916
818
gnutls_perror(ret);
917
819
errno = EPROTO;
918
820
goto mandos_end;
919
821
}
920
822
break;
921
823
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
824
fprintf(stderr, "Unknown error while reading data from"
924
825
" encrypted session with Mandos server\n");
925
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
827
errno = EIO;
932
833
}
933
834
934
835
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
937
837
}
938
838
939
839
if(quit_now){
969
869
if(ret == 0 and ferror(stdout)){
970
870
int e = errno;
971
871
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
872
fprintf(stderr, "Error writing encrypted data: %s\n",
974
873
strerror(errno));
975
874
}
976
875
errno = e;
996
895
if(e == 0){
997
896
e = errno;
998
897
}
999
perror_plus("close");
898
perror("close");
1000
899
}
1001
900
gnutls_deinit(session);
1002
errno = e;
1003
901
if(quit_now){
1004
errno = EINTR;
902
e = EINTR;
1005
903
retval = -1;
1006
904
}
905
errno = e;
1007
906
}
1008
907
return retval;
1009
908
}
1034
933
switch(event){
1035
934
default:
1036
935
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1039
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
938
avahi_strerror(avahi_server_errno(mc.server)));
1041
939
break;
1045
943
char ip[AVAHI_ADDRESS_STR_MAX];
1046
944
avahi_address_snprint(ip, sizeof(ip), address);
1047
945
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1050
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
948
ip, (intmax_t)interface, port);
1052
949
}
1054
951
avahi_proto_to_af(proto));
1055
952
if(ret == 0){
1056
953
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1060
954
}
1061
955
}
1062
956
}
1086
980
default:
1087
981
case AVAHI_BROWSER_FAILURE:
1088
982
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
983
fprintf(stderr, "(Avahi browser) %s\n",
1091
984
avahi_strerror(avahi_server_errno(mc.server)));
1092
985
avahi_simple_poll_quit(mc.simple_poll);
1093
986
return;
1101
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
995
name, type, domain, protocol, 0,
1103
996
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1106
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1107
999
break;
1108
1000
1112
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1006
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1117
1008
}
1118
1009
break;
1119
1010
}
1120
1011
}
1121
1012
1122
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1123
1014
static void handle_sigterm(int sig){
1124
1015
if(quit_now){
1125
1016
return;
1127
1018
quit_now = 1;
1128
1019
signal_received = sig;
1129
1020
int old_errno = errno;
1130
/* set main loop to exit */
1131
1021
if(mc.simple_poll != NULL){
1132
1022
avahi_simple_poll_quit(mc.simple_poll);
1133
1023
}
1134
1024
errno = old_errno;
1135
1025
}
1136
1026
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
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){
1148
1081
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1150
1084
}
1151
return false;
1085
free(flagstring);
1086
return 0;
1152
1087
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1158
1090
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1160
1092
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1163
1095
}
1164
return false;
1096
return 0;
1165
1097
}
1166
1098
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1168
1100
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1171
1103
}
1172
return true;
1104
return 1;
1173
1105
}
1174
1106
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
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
}
1191
1114
/* Accept this device */
1192
1115
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1405
1120
}
1406
1121
1407
1122
int main(int argc, char *argv[]){
1426
1141
bool gnutls_initialized = false;
1427
1142
bool gpgme_initialized = false;
1428
1143
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
1144
1432
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1439
1152
errno = 0;
1440
1153
ret = setgid(gid);
1441
1154
if(ret == -1){
1442
perror_plus("setgid");
1155
perror("setgid");
1443
1156
}
1444
1157
1445
1158
/* Lower user privileges (temporarily) */
1446
1159
errno = 0;
1447
1160
ret = seteuid(uid);
1448
1161
if(ret == -1){
1449
perror_plus("seteuid");
1162
perror("seteuid");
1450
1163
}
1451
1164
1452
1165
if(quit_now){
1487
1200
.arg = "SECONDS",
1488
1201
.doc = "Maximum delay to wait for interface startup",
1489
1202
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
1203
/*
1499
1204
* These reproduce what we would get without ARGP_NO_HELP
1500
1205
*/
1544
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
1250
argp_error(state, "Bad delay");
1546
1251
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
1252
break;
1559
1253
/*
1560
1254
* These reproduce what we would get without ARGP_NO_HELP
1567
1261
argp_state_help(state, state->out_stream,
1568
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
1263
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
1265
exit(argp_err_exit_status);
1573
1266
break;
1589
1282
case ENOMEM:
1590
1283
default:
1591
1284
errno = ret;
1592
perror_plus("argp_parse");
1285
perror("argp_parse");
1593
1286
exitcode = EX_OSERR;
1594
1287
goto end;
1595
1288
case EINVAL:
1597
1290
goto end;
1598
1291
}
1599
1292
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
1753
}
1754
1293
1755
1294
if(not debug){
1756
1295
avahi_set_log_function(empty_log);
1757
1296
}
1758
1297
1759
1298
if(interface[0] == '\0'){
1760
1299
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1763
1301
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
1302
if(ret >= 1){
1771
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1772
1304
interface = strdup(direntries[0]->d_name);
1773
1305
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1776
1307
}
1777
1308
if(interface == NULL){
1778
perror_plus("malloc");
1309
perror("malloc");
1779
1310
free(direntries);
1780
1311
exitcode = EXIT_FAILURE;
1781
1312
goto end;
1783
1314
free(direntries);
1784
1315
} else {
1785
1316
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1788
1318
exitcode = EXIT_FAILURE;
1789
1319
goto end;
1790
1320
}
1796
1326
srand((unsigned int) time(NULL));
1797
1327
mc.simple_poll = avahi_simple_poll_new();
1798
1328
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1801
1330
exitcode = EX_UNAVAILABLE;
1802
1331
goto end;
1803
1332
}
1805
1334
sigemptyset(&sigterm_action.sa_mask);
1806
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
1336
if(ret == -1){
1808
perror_plus("sigaddset");
1337
perror("sigaddset");
1809
1338
exitcode = EX_OSERR;
1810
1339
goto end;
1811
1340
}
1812
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
1342
if(ret == -1){
1814
perror_plus("sigaddset");
1343
perror("sigaddset");
1815
1344
exitcode = EX_OSERR;
1816
1345
goto end;
1817
1346
}
1818
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
1348
if(ret == -1){
1820
perror_plus("sigaddset");
1349
perror("sigaddset");
1821
1350
exitcode = EX_OSERR;
1822
1351
goto end;
1823
1352
}
1827
1356
*/
1828
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
1358
if(ret == -1){
1830
perror_plus("sigaction");
1359
perror("sigaction");
1831
1360
return EX_OSERR;
1832
1361
}
1833
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
1364
if(ret == -1){
1836
perror_plus("sigaction");
1365
perror("sigaction");
1837
1366
exitcode = EX_OSERR;
1838
1367
goto end;
1839
1368
}
1840
1369
}
1841
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
1371
if(ret == -1){
1843
perror_plus("sigaction");
1372
perror("sigaction");
1844
1373
return EX_OSERR;
1845
1374
}
1846
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
1377
if(ret == -1){
1849
perror_plus("sigaction");
1378
perror("sigaction");
1850
1379
exitcode = EX_OSERR;
1851
1380
goto end;
1852
1381
}
1853
1382
}
1854
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
1384
if(ret == -1){
1856
perror_plus("sigaction");
1385
perror("sigaction");
1857
1386
return EX_OSERR;
1858
1387
}
1859
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
1390
if(ret == -1){
1862
perror_plus("sigaction");
1391
perror("sigaction");
1863
1392
exitcode = EX_OSERR;
1864
1393
goto end;
1865
1394
}
1869
1398
if(strcmp(interface, "none") != 0){
1870
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
1400
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1874
1402
exitcode = EX_UNAVAILABLE;
1875
1403
goto end;
1876
1404
}
1883
1411
errno = 0;
1884
1412
ret = seteuid(0);
1885
1413
if(ret == -1){
1886
perror_plus("seteuid");
1414
perror("seteuid");
1887
1415
}
1888
1416
1889
1417
#ifdef __linux__
1893
1421
bool restore_loglevel = true;
1894
1422
if(ret == -1){
1895
1423
restore_loglevel = false;
1896
perror_plus("klogctl");
1424
perror("klogctl");
1897
1425
}
1898
1426
#endif /* __linux__ */
1899
1427
1900
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
1429
if(sd < 0){
1902
perror_plus("socket");
1430
perror("socket");
1903
1431
exitcode = EX_OSERR;
1904
1432
#ifdef __linux__
1905
1433
if(restore_loglevel){
1906
1434
ret = klogctl(7, NULL, 0);
1907
1435
if(ret == -1){
1908
perror_plus("klogctl");
1436
perror("klogctl");
1909
1437
}
1910
1438
}
1911
1439
#endif /* __linux__ */
1913
1441
errno = 0;
1914
1442
ret = seteuid(uid);
1915
1443
if(ret == -1){
1916
perror_plus("seteuid");
1444
perror("seteuid");
1917
1445
}
1918
1446
goto end;
1919
1447
}
1920
1448
strcpy(network.ifr_name, interface);
1921
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
1450
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1924
1452
#ifdef __linux__
1925
1453
if(restore_loglevel){
1926
1454
ret = klogctl(7, NULL, 0);
1927
1455
if(ret == -1){
1928
perror_plus("klogctl");
1456
perror("klogctl");
1929
1457
}
1930
1458
}
1931
1459
#endif /* __linux__ */
1934
1462
errno = 0;
1935
1463
ret = seteuid(uid);
1936
1464
if(ret == -1){
1937
perror_plus("seteuid");
1465
perror("seteuid");
1938
1466
}
1939
1467
goto end;
1940
1468
}
1944
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
1473
if(ret == -1){
1946
1474
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1948
1476
exitcode = EX_OSERR;
1949
1477
#ifdef __linux__
1950
1478
if(restore_loglevel){
1951
1479
ret = klogctl(7, NULL, 0);
1952
1480
if(ret == -1){
1953
perror_plus("klogctl");
1481
perror("klogctl");
1954
1482
}
1955
1483
}
1956
1484
#endif /* __linux__ */
1958
1486
errno = 0;
1959
1487
ret = seteuid(uid);
1960
1488
if(ret == -1){
1961
perror_plus("seteuid");
1489
perror("seteuid");
1962
1490
}
1963
1491
goto end;
1964
1492
}
1965
1493
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1968
1495
for(int i=0; i < delay * 4; i++){
1969
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
1497
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1972
1499
} else if(network.ifr_flags & IFF_RUNNING){
1973
1500
break;
1974
1501
}
1975
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
1503
ret = nanosleep(&sleeptime, NULL);
1977
1504
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1505
perror("nanosleep");
1979
1506
}
1980
1507
}
1981
1508
if(not take_down_interface){
1982
1509
/* We won't need the socket anymore */
1983
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
1511
if(ret == -1){
1985
perror_plus("close");
1512
perror("close");
1986
1513
}
1987
1514
}
1988
1515
#ifdef __linux__
1990
1517
/* Restores kernel loglevel to default */
1991
1518
ret = klogctl(7, NULL, 0);
1992
1519
if(ret == -1){
1993
perror_plus("klogctl");
1520
perror("klogctl");
1994
1521
}
1995
1522
}
1996
1523
#endif /* __linux__ */
2000
1527
/* Lower privileges */
2001
1528
ret = seteuid(uid);
2002
1529
if(ret == -1){
2003
perror_plus("seteuid");
1530
perror("seteuid");
2004
1531
}
2005
1532
} else {
2006
1533
/* Lower privileges permanently */
2007
1534
ret = setuid(uid);
2008
1535
if(ret == -1){
2009
perror_plus("setuid");
1536
perror("setuid");
2010
1537
}
2011
1538
}
2012
1539
}
2017
1544
2018
1545
ret = init_gnutls_global(pubkey, seckey);
2019
1546
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2022
1548
exitcode = EX_UNAVAILABLE;
2023
1549
goto end;
2024
1550
} else {
2029
1555
goto end;
2030
1556
}
2031
1557
1558
tempdir_created = true;
2032
1559
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2034
1562
goto end;
2035
1563
}
2036
tempdir_created = true;
2037
1564
2038
1565
if(quit_now){
2039
1566
goto end;
2040
1567
}
2041
1568
2042
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2045
1571
exitcode = EX_UNAVAILABLE;
2046
1572
goto end;
2047
1573
} else {
2057
1583
/* (Mainly meant for debugging) */
2058
1584
char *address = strrchr(connect_to, ':');
2059
1585
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2062
1587
exitcode = EX_USAGE;
2063
1588
goto end;
2064
1589
}
2072
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2073
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
1599
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2077
1601
exitcode = EX_USAGE;
2078
1602
goto end;
2079
1603
}
2084
1608
2085
1609
port = (uint16_t)tmpmax;
2086
1610
*address = '\0';
1611
address = connect_to;
2087
1612
/* Colon in address indicates IPv6 */
2088
1613
int af;
2089
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2090
1615
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
1616
} else {
2098
1617
af = AF_INET;
2099
1618
}
2100
address = connect_to;
2101
1619
2102
1620
if(quit_now){
2103
1621
goto end;
2104
1622
}
2105
1623
2106
1624
while(not quit_now){
2107
1625
ret = start_mandos_communication(address, port, if_index, af);
2108
1626
if(quit_now or ret == 0){
2109
1627
break;
2110
1628
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
1629
sleep(15);
1630
};
1631
2118
1632
if (not quit_now){
2119
1633
exitcode = EXIT_SUCCESS;
2120
1634
}
2121
1635
2122
1636
goto end;
2123
1637
}
2124
1638
2146
1660
2147
1661
/* Check if creating the Avahi server object succeeded */
2148
1662
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
2151
1664
avahi_strerror(error));
2152
1665
exitcode = EX_UNAVAILABLE;
2153
1666
goto end;
2162
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
1676
NULL, 0, browse_callback, NULL);
2164
1677
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1678
fprintf(stderr, "Failed to create service browser: %s\n",
2167
1679
avahi_strerror(avahi_server_errno(mc.server)));
2168
1680
exitcode = EX_UNAVAILABLE;
2169
1681
goto end;
2176
1688
/* Run the main loop */
2177
1689
2178
1690
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2190
1695
2191
1696
end:
2192
1697
2193
1698
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1700
}
2197
1701
2198
1702
/* Cleanup things */
2214
1718
if(gpgme_initialized){
2215
1719
gpgme_release(mc.ctx);
2216
1720
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
1721
2231
1722
/* Take down the network interface */
2232
1723
if(take_down_interface){
2234
1725
errno = 0;
2235
1726
ret = seteuid(0);
2236
1727
if(ret == -1){
2237
perror_plus("seteuid");
1728
perror("seteuid");
2238
1729
}
2239
1730
if(geteuid() == 0){
2240
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
1732
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2244
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
1737
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2248
1739
}
2249
1740
}
2250
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
1742
if(ret == -1){
2252
perror_plus("close");
1743
perror("close");
2253
1744
}
2254
1745
/* Lower privileges permanently */
2255
1746
errno = 0;
2256
1747
ret = setuid(uid);
2257
1748
if(ret == -1){
2258
perror_plus("setuid");
1749
perror("setuid");
2259
1750
}
2260
1751
}
2261
1752
}
2262
1753
2263
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2264
1755
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
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
}
2272
1776
char *fullname = NULL;
2273
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
1778
direntry->d_name);
2275
1779
if(ret < 0){
2276
perror_plus("asprintf");
1780
perror("asprintf");
2277
1781
continue;
2278
1782
}
2279
1783
ret = remove(fullname);
2280
1784
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2283
1787
}
2284
1788
free(fullname);
2285
1789
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1790
closedir(d);
2292
1791
}
2293
1792
ret = rmdir(tempdir);
2294
1793
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
1794
perror("rmdir");
2296
1795
}
2297
1796
}
2298
1797
2303
1802
&old_sigterm_action,
2304
1803
NULL));
2305
1804
if(ret == -1){
2306
perror_plus("sigaction");
1805
perror("sigaction");
2307
1806
}
2308
1807
do {
2309
1808
ret = raise(signal_received);
2310
1809
} while(ret != 0 and errno == EINTR);
2311
1810
if(ret != 0){
2312
perror_plus("raise");
1811
perror("raise");
2313
1812
abort();
2314
1813
}
2315
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0