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- Committer: Teddy Hogeborn
- Date: 2012-06-13 22:06:57 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120613220657-qvq7c7nrndl3t413
* plugins.d/mandos-client.c (get_flags): Don't clobber errno.
(up_interface): Removed; replaced with "interface_is_up".
(interface_is_up, interface_is_running,
lower_privileges_permanently, take_down_interface): New.
(bring_up_interface): Return "error_t". Use new functions
"interface_is_up", "get_flags", and
"interface_is_running".
(main): Save all interfaces either autodetected or specified with
--interface in argz vector "interfaces". Save interfaces to
take down on exit in argz vector "interfaces_to_take_down".
Save interface names for DEVICE variable to network hooks as
argz_vector "interfaces_hooks". Bug fix: Be privileged
while stopping network hooks.
* plugins.d/mandos-client.xml (SYNOPSIS): Changed --interface synopsis.
(DESCRIPTION): Updated to document use of all interfaces.
(OPTIONS): Updated description of "--interface".
* network-hooks.d/bridge: Parse comma-separated DEVICE environment
variable.
* network-hooks.d/openvpn: - '' -
* network-hooks.d/wireless: - '' -
(up_interface): Removed; replaced with "interface_is_up".
(interface_is_up, interface_is_running,
lower_privileges_permanently, take_down_interface): New.
(bring_up_interface): Return "error_t". Use new functions
"interface_is_up", "get_flags", and
"interface_is_running".
(main): Save all interfaces either autodetected or specified with
--interface in argz vector "interfaces". Save interfaces to
take down on exit in argz vector "interfaces_to_take_down".
Save interface names for DEVICE variable to network hooks as
argz_vector "interfaces_hooks". Bug fix: Be privileged
while stopping network hooks.
* plugins.d/mandos-client.xml (SYNOPSIS): Changed --interface synopsis.
(DESCRIPTION): Updated to document use of all interfaces.
(OPTIONS): Updated description of "--interface".
* network-hooks.d/bridge: Parse comma-separated DEVICE environment
variable.
* network-hooks.d/openvpn: - '' -
* network-hooks.d/wireless: - '' -
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
90
95
91
96
#ifdef __linux__
92
97
#include <sys/klog.h> /* klogctl() */
110
115
init_gnutls_session(),
111
116
GNUTLS_* */
112
117
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
115
120
116
121
/* GPGME */
117
122
#include <gpgme.h> /* All GPGME types, constants and
133
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
139
static const char sys_class_net[] = "/sys/class/net";
135
140
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
136
144
137
145
/* Doubly linked list that need to be circularly linked when used */
138
146
typedef struct server{
168
176
169
177
/* Function to use when printing errors */
170
178
void perror_plus(const char *print_text){
179
int e = errno;
171
180
fprintf(stderr, "Mandos plugin %s: ",
172
181
program_invocation_short_name);
182
errno = e;
173
183
perror(print_text);
174
184
}
175
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
176
196
/*
177
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
198
* bytes. "buffer_capacity" is how much is currently allocated,
179
199
* "buffer_length" is how much is already used.
180
200
*/
181
201
size_t incbuffer(char **buffer, size_t buffer_length,
182
size_t buffer_capacity){
202
size_t buffer_capacity){
183
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
184
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
185
205
if(buffer == NULL){
191
211
}
192
212
193
213
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
197
216
int ret;
198
217
server *new_server = malloc(sizeof(server));
199
218
if(new_server == NULL){
200
219
perror_plus("malloc");
201
return -1;
220
return false;
202
221
}
203
222
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
223
.port = port,
224
.if_index = if_index,
225
.af = af };
207
226
if(new_server->ip == NULL){
208
227
perror_plus("strdup");
209
return -1;
228
return false;
210
229
}
211
230
/* Special case of first server */
212
231
if (mc.current_server == NULL){
223
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
243
if(ret == -1){
225
244
perror_plus("clock_gettime");
226
return -1;
245
return false;
227
246
}
228
return 0;
247
return true;
229
248
}
230
249
231
250
/*
232
251
* Initialize GPGME.
233
252
*/
234
static bool init_gpgme(const char *seckey,
235
const char *pubkey, const char *tempdir){
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
236
255
gpgme_error_t rc;
237
256
gpgme_engine_info_t engine_info;
238
257
253
272
254
273
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
274
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
259
277
return false;
260
278
}
261
279
262
280
rc = gpgme_op_import(mc.ctx, pgp_data);
263
281
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
267
284
return false;
268
285
}
269
286
276
293
}
277
294
278
295
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
296
fprintf_plus(stderr, "Initializing GPGME\n");
281
297
}
282
298
283
299
/* Init GPGME */
284
300
gpgme_check_version(NULL);
285
301
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
302
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
290
305
return false;
291
306
}
292
307
293
308
/* Set GPGME home directory for the OpenPGP engine only */
294
309
rc = gpgme_get_engine_info(&engine_info);
295
310
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
299
313
return false;
300
314
}
301
315
while(engine_info != NULL){
307
321
engine_info = engine_info->next;
308
322
}
309
323
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
312
326
return false;
313
327
}
314
328
315
329
/* Create new GPGME "context" */
316
330
rc = gpgme_new(&(mc.ctx));
317
331
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
321
335
return false;
322
336
}
323
337
342
356
ssize_t plaintext_length = 0;
343
357
344
358
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
360
}
348
361
349
362
/* Create new GPGME data buffer from memory cryptotext */
350
363
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
364
0);
352
365
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
356
368
return -1;
357
369
}
358
370
359
371
/* Create new empty GPGME data buffer for the plaintext */
360
372
rc = gpgme_data_new(&dh_plain);
361
373
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
365
377
gpgme_data_release(dh_crypto);
366
378
return -1;
367
379
}
370
382
data buffer */
371
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
384
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
376
387
plaintext_length = -1;
377
388
if(debug){
378
389
gpgme_decrypt_result_t result;
379
390
result = gpgme_op_decrypt_result(mc.ctx);
380
391
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
393
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
390
398
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
400
}
394
401
gpgme_recipient_t recipient;
395
402
recipient = result->recipients;
396
403
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
406
411
recipient = recipient->next;
407
412
}
408
413
}
411
416
}
412
417
413
418
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
420
}
417
421
418
422
/* Seek back to the beginning of the GPGME plaintext data buffer */
425
429
*plaintext = NULL;
426
430
while(true){
427
431
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
432
(size_t)plaintext_length,
433
plaintext_capacity);
430
434
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
434
438
}
435
439
436
440
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
453
}
450
454
451
455
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
456
fprintf_plus(stderr, "Decrypted password is: ");
454
457
for(ssize_t i = 0; i < plaintext_length; i++){
455
458
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
459
}
478
481
/* GnuTLS log function callback */
479
482
static void debuggnutls(__attribute__((unused)) int level,
480
483
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
484
fprintf_plus(stderr, "GnuTLS: %s", string);
482
485
}
483
486
484
487
static int init_gnutls_global(const char *pubkeyfilename,
486
489
int ret;
487
490
488
491
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
493
}
492
494
493
495
ret = gnutls_global_init();
494
496
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
497
499
return -1;
498
500
}
499
501
508
510
/* OpenPGP credentials */
509
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
510
512
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
safer_gnutls_strerror(ret));
513
515
gnutls_global_deinit();
514
516
return -1;
515
517
}
516
518
517
519
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
522
524
}
523
525
524
526
ret = gnutls_certificate_set_openpgp_key_file
525
527
(mc.cred, pubkeyfilename, seckeyfilename,
526
528
GNUTLS_OPENPGP_FMT_BASE64);
527
529
if(ret != GNUTLS_E_SUCCESS){
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
534
535
goto globalfail;
535
536
}
536
537
537
538
/* GnuTLS server initialization */
538
539
ret = gnutls_dh_params_init(&mc.dh_params);
539
540
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
543
544
goto globalfail;
544
545
}
545
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
547
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
550
goto globalfail;
551
551
}
552
552
572
572
}
573
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
574
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
578
578
}
579
579
580
580
{
587
587
}
588
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
589
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
safer_gnutls_strerror(ret));
594
593
gnutls_deinit(*session);
595
594
return -1;
596
595
}
605
604
}
606
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
606
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
611
609
gnutls_deinit(*session);
612
610
return -1;
613
611
}
658
656
pf = PF_INET;
659
657
break;
660
658
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
660
errno = EINVAL;
664
661
return -1;
665
662
}
670
667
}
671
668
672
669
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
676
672
}
677
673
678
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
700
}
705
701
if(ret == 0){
706
702
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
704
errno = e;
710
705
goto mandos_end;
711
706
}
716
711
717
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
714
-Wunreachable-code*/
720
715
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
724
718
errno = EINVAL;
725
719
goto mandos_end;
726
720
}
744
738
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
739
perror_plus("if_indextoname");
746
740
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
750
743
}
751
744
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
754
747
}
755
748
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
749
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
759
perror_plus("inet_ntop");
767
760
} else {
768
761
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
763
}
772
764
}
773
765
}
801
793
while(true){
802
794
size_t out_size = strlen(out);
803
795
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
796
out_size - written));
805
797
if(ret == -1){
806
798
int e = errno;
807
799
perror_plus("write");
827
819
}
828
820
829
821
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
823
}
833
824
834
825
if(quit_now){
836
827
goto mandos_end;
837
828
}
838
829
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
835
842
836
if(quit_now){
843
837
errno = EINTR;
854
848
855
849
if(ret != GNUTLS_E_SUCCESS){
856
850
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
852
gnutls_perror(ret);
860
853
}
861
854
errno = EPROTO;
865
858
/* Read OpenPGP packet that contains the wanted password */
866
859
867
860
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
870
863
}
871
864
872
865
while(true){
877
870
}
878
871
879
872
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
873
buffer_capacity);
881
874
if(buffer_capacity == 0){
882
875
int e = errno;
883
876
perror_plus("incbuffer");
910
903
}
911
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
905
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
915
908
gnutls_perror(ret);
916
909
errno = EPROTO;
917
910
goto mandos_end;
918
911
}
919
912
break;
920
913
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
924
916
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
917
errno = EIO;
926
918
goto mandos_end;
931
923
}
932
924
933
925
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
926
fprintf_plus(stderr, "Closing TLS session\n");
936
927
}
937
928
938
929
if(quit_now){
950
941
951
942
if(buffer_length > 0){
952
943
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
954
buffer_length,
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
955
945
&decrypted_buffer);
956
946
if(decrypted_buffer_size >= 0){
957
947
968
958
if(ret == 0 and ferror(stdout)){
969
959
int e = errno;
970
960
if(debug){
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
973
strerror(errno));
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
974
963
}
975
964
errno = e;
976
965
goto mandos_end;
1033
1022
switch(event){
1034
1023
default:
1035
1024
case AVAHI_RESOLVER_FAILURE:
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
1038
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
avahi_strerror(avahi_server_errno(mc.server)));
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
1040
1029
break;
1041
1030
1042
1031
case AVAHI_RESOLVER_FOUND:
1044
1033
char ip[AVAHI_ADDRESS_STR_MAX];
1045
1034
avahi_address_snprint(ip, sizeof(ip), address);
1046
1035
if(debug){
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
1051
1039
}
1052
1040
int ret = start_mandos_communication(ip, port, interface,
1053
1041
avahi_proto_to_af(proto));
1054
1042
if(ret == 0){
1055
1043
avahi_simple_poll_quit(mc.simple_poll);
1056
1044
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
1059
1050
}
1060
1051
}
1061
1052
}
1085
1076
default:
1086
1077
case AVAHI_BROWSER_FAILURE:
1087
1078
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
1090
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1091
1081
avahi_simple_poll_quit(mc.simple_poll);
1092
1082
return;
1093
1083
1100
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
1091
name, type, domain, protocol, 0,
1102
1092
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
1105
name, avahi_strerror(avahi_server_errno(mc.server)));
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1106
1096
break;
1107
1097
1108
1098
case AVAHI_BROWSER_REMOVE:
1111
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1113
1103
if(debug){
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1116
1106
}
1117
1107
break;
1118
1108
}
1135
1125
1136
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1137
1127
int ret;
1128
error_t ret_errno;
1138
1129
1139
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
1131
if(s < 0){
1132
ret_errno = errno;
1141
1133
perror_plus("socket");
1134
errno = ret_errno;
1142
1135
return false;
1143
1136
}
1144
1137
strcpy(ifr->ifr_name, ifname);
1145
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
1139
if(ret == -1){
1147
1140
if(debug){
1141
ret_errno = errno;
1148
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1149
1144
}
1150
1145
return false;
1151
1146
}
1157
1152
/* Reject the loopback device */
1158
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
1154
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1162
1157
}
1163
1158
return false;
1164
1159
}
1165
1160
/* Accept point-to-point devices only if connect_to is specified */
1166
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
1162
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1170
1165
}
1171
1166
return true;
1172
1167
}
1173
1168
/* Otherwise, reject non-broadcast-capable devices */
1174
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
1170
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1178
1173
}
1179
1174
return false;
1180
1175
}
1181
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
1177
if(ifr->ifr_flags & IFF_NOARP){
1183
1178
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1186
1181
}
1187
1182
return false;
1188
1183
}
1189
1184
1190
1185
/* Accept this device */
1191
1186
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1194
1188
}
1195
1189
return true;
1196
1190
}
1208
1202
struct ifreq ifr;
1209
1203
if(not get_flags(if_entry->d_name, &ifr)){
1210
1204
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1268
1247
}
1269
1248
1270
1249
int notdotentries(const struct dirent *direntry){
1281
1260
/* Is this directory entry a runnable program? */
1282
1261
int runnable_hook(const struct dirent *direntry){
1283
1262
int ret;
1263
size_t sret;
1284
1264
struct stat st;
1285
1265
1286
1266
if((direntry->d_name)[0] == '\0'){
1288
1268
return 0;
1289
1269
}
1290
1270
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1308
1292
if(ret == -1){
1309
1293
if(debug){
1310
perror_plus("Could not stat plugin");
1294
perror_plus("Could not stat hook");
1311
1295
}
1312
1296
return 0;
1313
1297
}
1314
1298
if(not (S_ISREG(st.st_mode))){
1315
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1316
1304
return 0;
1317
1305
}
1318
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1320
1312
return 0;
1321
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1322
1318
return 1;
1323
1319
}
1324
1320
1331
1327
while(true){
1332
1328
if(mc.current_server == NULL){
1333
1329
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1336
1332
}
1337
1333
ret = avahi_simple_poll_iterate(s, -1);
1338
1334
} else {
1339
1335
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1343
1338
}
1344
1339
/* the current time */
1345
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1357
1363
1358
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1366
1361
}
1367
1362
1368
1363
if(block_time <= 0){
1395
1390
}
1396
1391
}
1397
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
1398
1743
int main(int argc, char *argv[]){
1399
1744
AvahiSServiceBrowser *sb = NULL;
1400
int error;
1745
error_t ret_errno;
1401
1746
int ret;
1402
1747
intmax_t tmpmax;
1403
1748
char *tmp;
1404
1749
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
1406
struct ifreq network;
1407
int sd = -1;
1408
bool take_down_interface = false;
1409
uid_t uid;
1410
gid_t gid;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
1411
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1412
1755
bool tempdir_created = false;
1413
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1414
1757
const char *seckey = PATHDIR "/" SECKEY;
1415
1758
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1416
1761
1417
1762
bool gnutls_initialized = false;
1418
1763
bool gpgme_initialized = false;
1480
1825
.group = 2 },
1481
1826
{ .name = "retry", .key = 132,
1482
1827
.arg = "SECONDS",
1483
.doc = "Retry interval used when denied by the mandos server",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1484
1833
.group = 2 },
1485
1834
/*
1486
1835
* These reproduce what we would get without ARGP_NO_HELP
1505
1854
connect_to = arg;
1506
1855
break;
1507
1856
case 'i': /* --interface */
1508
interface = arg;
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1509
1862
break;
1510
1863
case 's': /* --seckey */
1511
1864
seckey = arg;
1540
1893
argp_error(state, "Bad retry interval");
1541
1894
}
1542
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1543
1899
/*
1544
1900
* These reproduce what we would get without ARGP_NO_HELP
1545
1901
*/
1551
1907
argp_state_help(state, state->out_stream,
1552
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
1909
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1556
1911
exit(argp_err_exit_status);
1557
1912
break;
1558
1913
default:
1585
1940
{
1586
1941
/* Work around Debian bug #633582:
1587
1942
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1943
1590
1944
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
} else {
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
1737
2027
}
1738
2028
}
1739
2029
1741
2031
avahi_set_log_function(empty_log);
1742
2032
}
1743
2033
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1774
goto end;
1775
}
1776
}
1777
1778
2034
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
2035
from the signal handler */
1780
2036
/* Initialize the pseudo-RNG for Avahi */
1781
2037
srand((unsigned int) time(NULL));
1782
2038
mc.simple_poll = avahi_simple_poll_new();
1783
2039
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
1786
2042
exitcode = EX_UNAVAILABLE;
1787
2043
goto end;
1788
2044
}
1850
2106
}
1851
2107
}
1852
2108
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1860
goto end;
1861
}
1862
1863
if(quit_now){
1864
goto end;
1865
}
1866
1867
/* Re-raise priviliges */
1868
errno = 0;
1869
ret = seteuid(0);
1870
if(ret == -1){
1871
perror_plus("seteuid");
1872
}
1873
1874
#ifdef __linux__
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1879
if(ret == -1){
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1882
}
1883
#endif /* __linux__ */
1884
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
if(sd < 0){
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1889
#ifdef __linux__
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1892
if(ret == -1){
1893
perror_plus("klogctl");
1894
}
1895
}
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1898
errno = 0;
1899
ret = seteuid(uid);
1900
if(ret == -1){
1901
perror_plus("seteuid");
1902
}
1903
goto end;
1904
}
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1909
#ifdef __linux__
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1912
if(ret == -1){
1913
perror_plus("klogctl");
1914
}
1915
}
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
if(ret == -1){
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1934
#ifdef __linux__
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1937
if(ret == -1){
1938
perror_plus("klogctl");
1939
}
1940
}
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
goto end;
1949
}
1950
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1958
break;
1959
}
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1964
}
1965
}
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
if(ret == -1){
1970
perror_plus("close");
1971
}
1972
}
1973
#ifdef __linux__
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1977
if(ret == -1){
1978
perror_plus("klogctl");
1979
}
1980
}
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1983
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
1990
2130
} else {
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1995
2164
}
1996
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
1997
2172
}
1998
2173
1999
2174
if(quit_now){
2002
2177
2003
2178
ret = init_gnutls_global(pubkey, seckey);
2004
2179
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2007
2181
exitcode = EX_UNAVAILABLE;
2008
2182
goto end;
2009
2183
} else {
2025
2199
}
2026
2200
2027
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2203
exitcode = EX_UNAVAILABLE;
2031
2204
goto end;
2032
2205
} else {
2041
2214
/* Connect directly, do not use Zeroconf */
2042
2215
/* (Mainly meant for debugging) */
2043
2216
char *address = strrchr(connect_to, ':');
2217
2044
2218
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2219
fprintf_plus(stderr, "No colon in address\n");
2047
2220
exitcode = EX_USAGE;
2048
2221
goto end;
2049
2222
}
2057
2230
tmpmax = strtoimax(address+1, &tmp, 10);
2058
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
2232
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2233
fprintf_plus(stderr, "Bad port number\n");
2062
2234
exitcode = EX_USAGE;
2063
2235
goto end;
2064
2236
}
2094
2266
break;
2095
2267
}
2096
2268
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2099
2271
}
2100
2272
sleep((int)retry_interval);
2101
2273
}
2123
2295
/* Allocate a new server */
2124
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2125
2297
(mc.simple_poll), &config, NULL,
2126
NULL, &error);
2298
NULL, &ret_errno);
2127
2299
2128
2300
/* Free the Avahi configuration data */
2129
2301
avahi_server_config_free(&config);
2131
2303
2132
2304
/* Check if creating the Avahi server object succeeded */
2133
2305
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
2136
avahi_strerror(error));
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2137
2308
exitcode = EX_UNAVAILABLE;
2138
2309
goto end;
2139
2310
}
2147
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
2319
NULL, 0, browse_callback, NULL);
2149
2320
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
2152
avahi_strerror(avahi_server_errno(mc.server)));
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
2153
2323
exitcode = EX_UNAVAILABLE;
2154
2324
goto end;
2155
2325
}
2161
2331
/* Run the main loop */
2162
2332
2163
2333
if(debug){
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2166
2335
}
2167
2336
2168
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
2338
(int)(retry_interval * 1000));
2170
2339
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2174
2342
}
2175
2343
2176
2344
end:
2177
2345
2178
2346
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2181
2348
}
2182
2349
2183
2350
/* Cleanup things */
2199
2366
if(gpgme_initialized){
2200
2367
gpgme_release(mc.ctx);
2201
2368
}
2202
2369
2203
2370
/* Cleans up the circular linked list of Mandos servers the client
2204
2371
has seen */
2205
2372
if(mc.current_server != NULL){
2211
2378
}
2212
2379
}
2213
2380
2214
/* XXX run network hooks "stop" here */
2215
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2219
errno = 0;
2220
ret = seteuid(0);
2221
if(ret == -1){
2222
perror_plus("seteuid");
2223
}
2224
if(geteuid() == 0){
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2233
2398
}
2234
2399
}
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
if(ret == -1){
2237
perror_plus("close");
2238
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2244
2403
}
2245
2404
}
2405
2406
lower_privileges_permanently();
2246
2407
}
2247
2408
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2248
2412
/* Removes the GPGME temp directory and all files inside */
2249
2413
if(tempdir_created){
2250
2414
struct dirent **direntries = NULL;
2263
2427
}
2264
2428
ret = remove(fullname);
2265
2429
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2268
2432
}
2269
2433
free(fullname);
2270
2434
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0