To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 646
- compare with another revision
- download diff
- download tarball
- view history from revision 646
- Committer: Teddy Hogeborn
- Date: 2013-12-15 22:21:28 UTC
- Revision ID: teddy@recompile.se-20131215222128-k6f1wbl6lv4v0kd8
Suppress spurious warnings when needed.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
90
94
91
95
#ifdef __linux__
92
96
#include <sys/klog.h> /* klogctl() */
134
138
static const char sys_class_net[] = "/sys/class/net";
135
139
char *connect_to = NULL;
136
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
137
143
138
144
/* Doubly linked list that need to be circularly linked when used */
139
145
typedef struct server{
140
146
const char *ip;
141
uint16_t port;
147
in_port_t port;
142
148
AvahiIfIndex if_index;
143
149
int af;
144
150
struct timespec last_seen;
148
154
149
155
/* Used for passing in values through the Avahi callback functions */
150
156
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
157
AvahiServer *server;
153
158
gnutls_certificate_credentials_t cred;
154
159
unsigned int dh_bits;
156
161
const char *priority;
157
162
gpgme_ctx_t ctx;
158
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
159
166
} mandos_context;
160
167
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
166
170
167
171
sig_atomic_t quit_now = 0;
168
172
int signal_received = 0;
169
173
170
174
/* Function to use when printing errors */
171
175
void perror_plus(const char *print_text){
176
int e = errno;
172
177
fprintf(stderr, "Mandos plugin %s: ",
173
178
program_invocation_short_name);
179
errno = e;
174
180
perror(print_text);
175
181
}
176
182
183
__attribute__((format (gnu_printf, 2, 3)))
177
184
int fprintf_plus(FILE *stream, const char *format, ...){
178
185
va_list ap;
179
186
va_start (ap, format);
180
187
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
191
}
184
192
185
193
/*
200
208
}
201
209
202
210
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
205
213
int ret;
206
214
server *new_server = malloc(sizeof(server));
207
215
if(new_server == NULL){
208
216
perror_plus("malloc");
209
return -1;
217
return false;
210
218
}
211
219
*new_server = (server){ .ip = strdup(ip),
212
220
.port = port,
214
222
.af = af };
215
223
if(new_server->ip == NULL){
216
224
perror_plus("strdup");
217
return -1;
225
return false;
218
226
}
219
227
/* Special case of first server */
220
if (mc.current_server == NULL){
228
if(*current_server == NULL){
221
229
new_server->next = new_server;
222
230
new_server->prev = new_server;
223
mc.current_server = new_server;
231
*current_server = new_server;
224
232
/* Place the new server last in the list */
225
233
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
228
236
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
230
238
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
232
240
if(ret == -1){
233
241
perror_plus("clock_gettime");
234
return -1;
242
return false;
235
243
}
236
return 0;
244
return true;
237
245
}
238
246
239
247
/*
240
248
* Initialize GPGME.
241
249
*/
242
250
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
251
const char *tempdir, mandos_context *mc){
244
252
gpgme_error_t rc;
245
253
gpgme_engine_info_t engine_info;
246
254
247
248
255
/*
249
256
* Helper function to insert pub and seckey to the engine keyring.
250
257
*/
262
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
270
if(rc != GPG_ERR_NO_ERROR){
264
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
272
gpgme_strsource(rc), gpgme_strerror(rc));
266
273
return false;
267
274
}
268
275
269
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
270
277
if(rc != GPG_ERR_NO_ERROR){
271
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
279
gpgme_strsource(rc), gpgme_strerror(rc));
273
280
return false;
274
281
}
275
282
290
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
298
if(rc != GPG_ERR_NO_ERROR){
292
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
300
gpgme_strsource(rc), gpgme_strerror(rc));
294
301
return false;
295
302
}
296
303
298
305
rc = gpgme_get_engine_info(&engine_info);
299
306
if(rc != GPG_ERR_NO_ERROR){
300
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
308
gpgme_strsource(rc), gpgme_strerror(rc));
302
309
return false;
303
310
}
304
311
while(engine_info != NULL){
310
317
engine_info = engine_info->next;
311
318
}
312
319
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
314
322
return false;
315
323
}
316
324
317
325
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
319
327
if(rc != GPG_ERR_NO_ERROR){
320
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
323
331
return false;
324
332
}
325
333
336
344
*/
337
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
338
346
size_t crypto_size,
339
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
340
349
gpgme_data_t dh_crypto, dh_plain;
341
350
gpgme_error_t rc;
342
351
ssize_t ret;
352
361
0);
353
362
if(rc != GPG_ERR_NO_ERROR){
354
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
364
gpgme_strsource(rc), gpgme_strerror(rc));
356
365
return -1;
357
366
}
358
367
360
369
rc = gpgme_data_new(&dh_plain);
361
370
if(rc != GPG_ERR_NO_ERROR){
362
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
365
374
gpgme_data_release(dh_crypto);
366
375
return -1;
367
376
}
368
377
369
378
/* Decrypt data from the cryptotext data buffer to the plaintext
370
379
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
381
if(rc != GPG_ERR_NO_ERROR){
373
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
gpgme_strsource(rc), gpgme_strerror(rc));
383
gpgme_strsource(rc), gpgme_strerror(rc));
375
384
plaintext_length = -1;
376
385
if(debug){
377
386
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
379
388
if(result == NULL){
380
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
390
} else {
382
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
383
result->unsupported_algorithm);
392
result->unsupported_algorithm);
384
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
385
result->wrong_key_usage);
394
result->wrong_key_usage);
386
395
if(result->file_name != NULL){
387
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
388
397
}
390
399
recipient = result->recipients;
391
400
while(recipient != NULL){
392
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
394
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
405
fprintf_plus(stderr, "Secret key available: %s\n",
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
398
408
recipient = recipient->next;
399
409
}
400
410
}
458
468
}
459
469
460
470
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
463
472
if(ret == NULL)
464
473
ret = "(unknown)";
465
474
return ret;
472
481
}
473
482
474
483
static int init_gnutls_global(const char *pubkeyfilename,
475
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
476
486
int ret;
477
487
478
488
if(debug){
481
491
482
492
ret = gnutls_global_init();
483
493
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
485
496
return -1;
486
497
}
487
498
494
505
}
495
506
496
507
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
498
509
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
500
512
gnutls_global_deinit();
501
513
return -1;
502
514
}
503
515
504
516
if(debug){
505
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
508
521
}
509
522
510
523
ret = gnutls_certificate_set_openpgp_key_file
511
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
512
525
GNUTLS_OPENPGP_FMT_BASE64);
513
526
if(ret != GNUTLS_E_SUCCESS){
514
527
fprintf_plus(stderr,
515
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
518
532
goto globalfail;
519
533
}
520
534
521
535
/* GnuTLS server initialization */
522
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
523
537
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
526
541
goto globalfail;
527
542
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
529
544
if(ret != GNUTLS_E_SUCCESS){
530
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
546
safer_gnutls_strerror(ret));
532
547
goto globalfail;
533
548
}
534
549
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
551
537
552
return 0;
538
553
539
554
globalfail:
540
555
541
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
542
557
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
544
559
return -1;
545
560
}
546
561
547
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
548
564
int ret;
549
565
/* GnuTLS session creation */
550
566
do {
554
570
}
555
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
572
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
559
576
}
560
577
561
578
{
562
579
const char *err;
563
580
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
565
582
if(quit_now){
566
583
gnutls_deinit(*session);
567
584
return -1;
569
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
587
if(ret != GNUTLS_E_SUCCESS){
571
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
573
591
gnutls_deinit(*session);
574
592
return -1;
575
593
}
577
595
578
596
do {
579
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
598
mc->cred);
581
599
if(quit_now){
582
600
gnutls_deinit(*session);
583
601
return -1;
585
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
604
if(ret != GNUTLS_E_SUCCESS){
587
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
606
safer_gnutls_strerror(ret));
589
607
gnutls_deinit(*session);
590
608
return -1;
591
609
}
593
611
/* ignore client certificate if any. */
594
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
613
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
597
615
598
616
return 0;
599
617
}
603
621
__attribute__((unused)) const char *txt){}
604
622
605
623
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
607
625
AvahiIfIndex if_index,
608
int af){
626
int af, mandos_context *mc){
609
627
int ret, tcp_sd = -1;
610
628
ssize_t sret;
611
629
union {
641
659
return -1;
642
660
}
643
661
644
ret = init_gnutls_session(&session);
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
645
695
if(ret != 0){
646
696
return -1;
647
697
}
648
698
649
699
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
652
702
}
653
703
654
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
685
735
goto mandos_end;
686
736
}
687
737
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
692
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
695
748
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
698
751
errno = EINVAL;
699
752
goto mandos_end;
700
753
}
702
755
to.in6.sin6_scope_id = (uint32_t)if_index;
703
756
}
704
757
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
758
to.in.sin_port = htons(port);
708
759
}
709
760
710
761
if(quit_now){
718
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
770
perror_plus("if_indextoname");
720
771
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
723
774
}
724
775
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
726
778
}
727
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
806
858
goto mandos_end;
807
859
}
808
860
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
811
866
812
867
if(quit_now){
813
868
errno = EINTR;
834
889
/* Read OpenPGP packet that contains the wanted password */
835
890
836
891
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
838
894
}
839
895
840
896
while(true){
878
934
}
879
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
936
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
882
939
gnutls_perror(ret);
883
940
errno = EPROTO;
884
941
goto mandos_end;
886
943
break;
887
944
default:
888
945
fprintf_plus(stderr, "Unknown error while reading data from"
889
" encrypted session with Mandos server\n");
946
" encrypted session with Mandos server\n");
890
947
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
948
errno = EIO;
892
949
goto mandos_end;
916
973
if(buffer_length > 0){
917
974
ssize_t decrypted_buffer_size;
918
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
919
&decrypted_buffer);
976
&decrypted_buffer, mc);
920
977
if(decrypted_buffer_size >= 0){
921
978
922
979
written = 0;
933
990
int e = errno;
934
991
if(debug){
935
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
936
strerror(errno));
993
strerror(errno));
937
994
}
938
995
errno = e;
939
996
goto mandos_end;
983
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
984
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
985
1042
flags,
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
988
1047
989
1048
/* Called whenever a service has been resolved successfully or
990
1049
timed out */
996
1055
switch(event){
997
1056
default:
998
1057
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1002
1063
break;
1003
1064
1004
1065
case AVAHI_RESOLVER_FOUND:
1007
1068
avahi_address_snprint(ip, sizeof(ip), address);
1008
1069
if(debug){
1009
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
1012
1073
}
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1015
1078
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1017
1080
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1020
1087
}
1021
1088
}
1022
1089
}
1032
1099
const char *domain,
1033
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
1101
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1037
1106
1038
1107
/* Called whenever a new services becomes available on the LAN or
1039
1108
is removed from the LAN */
1047
1116
case AVAHI_BROWSER_FAILURE:
1048
1117
1049
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1052
1122
return;
1053
1123
1054
1124
case AVAHI_BROWSER_NEW:
1057
1127
the callback function is called the Avahi server will free the
1058
1128
resolver for us. */
1059
1129
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1065
1138
break;
1066
1139
1067
1140
case AVAHI_BROWSER_REMOVE:
1070
1143
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
1144
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
1145
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1074
1148
}
1075
1149
break;
1076
1150
}
1085
1159
signal_received = sig;
1086
1160
int old_errno = errno;
1087
1161
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1090
1164
}
1091
1165
errno = old_errno;
1092
1166
}
1093
1167
1094
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
1169
int ret;
1170
error_t ret_errno;
1096
1171
1097
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
1173
if(s < 0){
1174
ret_errno = errno;
1099
1175
perror_plus("socket");
1176
errno = ret_errno;
1100
1177
return false;
1101
1178
}
1102
1179
strcpy(ifr->ifr_name, ifname);
1103
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
1181
if(ret == -1){
1105
1182
if(debug){
1183
ret_errno = errno;
1106
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1107
1186
}
1108
1187
return false;
1109
1188
}
1115
1194
/* Reject the loopback device */
1116
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
1196
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1119
1199
}
1120
1200
return false;
1121
1201
}
1122
1202
/* Accept point-to-point devices only if connect_to is specified */
1123
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
1204
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1126
1207
}
1127
1208
return true;
1128
1209
}
1129
1210
/* Otherwise, reject non-broadcast-capable devices */
1130
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
1212
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1133
1215
}
1134
1216
return false;
1135
1217
}
1136
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
1219
if(ifr->ifr_flags & IFF_NOARP){
1138
1220
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1140
1223
}
1141
1224
return false;
1142
1225
}
1161
1244
struct ifreq ifr;
1162
1245
if(not get_flags(if_entry->d_name, &ifr)){
1163
1246
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1255
}
1256
return 1;
1257
}
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1217
1289
}
1218
1290
1219
1291
int notdotentries(const struct dirent *direntry){
1246
1318
/* Contains non-allowed characters */
1247
1319
if(debug){
1248
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1321
direntry->d_name);
1250
1322
}
1251
1323
return 0;
1252
1324
}
1269
1341
/* Not a regular file */
1270
1342
if(debug){
1271
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1344
direntry->d_name);
1273
1345
}
1274
1346
return 0;
1275
1347
}
1277
1349
/* Not executable */
1278
1350
if(debug){
1279
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1352
direntry->d_name);
1281
1353
}
1282
1354
return 0;
1283
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1284
1360
return 1;
1285
1361
}
1286
1362
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1288
1365
int ret;
1289
1366
struct timespec now;
1290
1367
struct timespec waited_time;
1291
1368
intmax_t block_time;
1292
1369
1293
1370
while(true){
1294
if(mc.current_server == NULL){
1371
if(mc->current_server == NULL){
1295
1372
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1297
1375
}
1298
1376
ret = avahi_simple_poll_iterate(s, -1);
1299
1377
} else {
1300
1378
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1303
1381
}
1304
1382
/* the current time */
1305
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1310
1388
/* Calculating in ms how long time between now and server
1311
1389
who we visted longest time ago. Now - last seen. */
1312
1390
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1391
- mc->current_server->last_seen.tv_sec);
1314
1392
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1393
- mc->current_server->last_seen.tv_nsec);
1316
1394
/* total time is 10s/10,000ms.
1317
1395
Converting to s from ms by dividing by 1,000,
1318
1396
and ns to ms by dividing by 1,000,000. */
1321
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1400
1323
1401
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1325
1404
}
1326
1405
1327
1406
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1332
1411
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1412
avahi_simple_poll_quit(s);
1334
1413
return 0;
1335
1414
}
1336
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1416
&mc->current_server->last_seen);
1338
1417
if(ret == -1){
1339
1418
perror_plus("clock_gettime");
1340
1419
return -1;
1341
1420
}
1342
mc.current_server = mc.current_server->next;
1421
mc->current_server = mc->current_server->next;
1343
1422
block_time = 0; /* Call avahi to find new Mandos
1344
1423
servers, but don't block */
1345
1424
}
1354
1433
}
1355
1434
}
1356
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1357
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1358
1798
AvahiSServiceBrowser *sb = NULL;
1359
int error;
1799
error_t ret_errno;
1360
1800
int ret;
1361
1801
intmax_t tmpmax;
1362
1802
char *tmp;
1363
1803
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1370
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1371
1807
bool tempdir_created = false;
1372
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
1809
const char *seckey = PATHDIR "/" SECKEY;
1374
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1375
1813
1376
1814
bool gnutls_initialized = false;
1377
1815
bool gpgme_initialized = false;
1439
1877
.group = 2 },
1440
1878
{ .name = "retry", .key = 132,
1441
1879
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1443
1881
.group = 2 },
1444
1882
{ .name = "network-hook-dir", .key = 133,
1445
1883
.arg = "DIR",
1468
1906
connect_to = arg;
1469
1907
break;
1470
1908
case 'i': /* --interface */
1471
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1472
1914
break;
1473
1915
case 's': /* --seckey */
1474
1916
seckey = arg;
1517
1959
argp_state_help(state, state->out_stream,
1518
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
1961
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
1963
exit(argp_err_exit_status);
1523
1964
break;
1551
1992
{
1552
1993
/* Work around Debian bug #633582:
1553
1994
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1995
1556
1996
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
1619
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
1704
2080
}
1705
2081
}
1706
2082
1708
2084
avahi_set_log_function(empty_log);
1709
2085
}
1710
2086
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1743
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
2088
from the signal handler */
1745
2089
/* Initialize the pseudo-RNG for Avahi */
1746
2090
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1750
2095
exitcode = EX_UNAVAILABLE;
1751
2096
goto end;
1752
2097
}
1814
2159
}
1815
2160
}
1816
2161
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1902
2208
}
1903
2209
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
2210
break;
1922
2211
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1960
2237
}
1961
2238
1962
2239
if(quit_now){
1963
2240
goto end;
1964
2241
}
1965
2242
1966
ret = init_gnutls_global(pubkey, seckey);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1967
2244
if(ret == -1){
1968
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
2246
exitcode = EX_UNAVAILABLE;
1986
2263
goto end;
1987
2264
}
1988
2265
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1990
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1991
2268
exitcode = EX_UNAVAILABLE;
1992
2269
goto end;
2002
2279
/* Connect directly, do not use Zeroconf */
2003
2280
/* (Mainly meant for debugging) */
2004
2281
char *address = strrchr(connect_to, ':');
2282
2005
2283
if(address == NULL){
2006
2284
fprintf_plus(stderr, "No colon in address\n");
2007
2285
exitcode = EX_USAGE;
2012
2290
goto end;
2013
2291
}
2014
2292
2015
uint16_t port;
2293
in_port_t port;
2016
2294
errno = 0;
2017
2295
tmpmax = strtoimax(address+1, &tmp, 10);
2018
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
2297
or tmpmax != (in_port_t)tmpmax){
2020
2298
fprintf_plus(stderr, "Bad port number\n");
2021
2299
exitcode = EX_USAGE;
2022
2300
goto end;
2023
2301
}
2024
2302
2025
2303
if(quit_now){
2026
2304
goto end;
2027
2305
}
2028
2306
2029
port = (uint16_t)tmpmax;
2307
port = (in_port_t)tmpmax;
2030
2308
*address = '\0';
2031
2309
/* Colon in address indicates IPv6 */
2032
2310
int af;
2048
2326
}
2049
2327
2050
2328
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2052
2331
if(quit_now or ret == 0){
2053
2332
break;
2054
2333
}
2055
2334
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2057
2337
}
2058
sleep((int)retry_interval);
2338
sleep((unsigned int)retry_interval);
2059
2339
}
2060
2340
2061
2341
if (not quit_now){
2079
2359
config.publish_domain = 0;
2080
2360
2081
2361
/* Allocate a new server */
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2085
2364
2086
2365
/* Free the Avahi configuration data */
2087
2366
avahi_server_config_free(&config);
2090
2369
/* Check if creating the Avahi server object succeeded */
2091
2370
if(mc.server == NULL){
2092
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2093
avahi_strerror(error));
2372
avahi_strerror(ret_errno));
2094
2373
exitcode = EX_UNAVAILABLE;
2095
2374
goto end;
2096
2375
}
2102
2381
/* Create the Avahi service browser */
2103
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2106
2386
if(sb == NULL){
2107
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2108
avahi_strerror(avahi_server_errno(mc.server)));
2388
avahi_strerror(avahi_server_errno(mc.server)));
2109
2389
exitcode = EX_UNAVAILABLE;
2110
2390
goto end;
2111
2391
}
2120
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
2401
}
2122
2402
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2125
2405
if(debug){
2126
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2407
(ret == 0) ? "successfully" : "with error");
2128
2408
}
2129
2409
2130
2410
end:
2134
2414
}
2135
2415
2136
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
2137
2419
if(sb != NULL)
2138
2420
avahi_s_service_browser_free(sb);
2139
2421
2140
2422
if(mc.server != NULL)
2141
2423
avahi_server_free(mc.server);
2142
2424
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2145
2427
2146
2428
if(gnutls_initialized){
2147
2429
gnutls_certificate_free_credentials(mc.cred);
2152
2434
if(gpgme_initialized){
2153
2435
gpgme_release(mc.ctx);
2154
2436
}
2155
2437
2156
2438
/* Cleans up the circular linked list of Mandos servers the client
2157
2439
has seen */
2158
2440
if(mc.current_server != NULL){
2164
2446
}
2165
2447
}
2166
2448
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2176
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2186
2467
}
2187
2468
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2197
2472
}
2198
2473
}
2474
2475
lower_privileges_permanently();
2199
2476
}
2200
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2201
2481
/* Removes the GPGME temp directory and all files inside */
2202
2482
if(tempdir_created){
2203
2483
struct dirent **direntries = NULL;
2216
2496
}
2217
2497
ret = remove(fullname);
2218
2498
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2220
2501
}
2221
2502
free(fullname);
2222
2503
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0