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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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() */
88
94
89
95
#ifdef __linux__
90
96
#include <sys/klog.h> /* klogctl() */
108
114
init_gnutls_session(),
109
115
GNUTLS_* */
110
116
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
113
119
114
120
/* GPGME */
115
121
#include <gpgme.h> /* All GPGME types, constants and
123
129
#define PATHDIR "/conf/conf.d/mandos"
124
130
#define SECKEY "seckey.txt"
125
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
133
127
134
bool debug = false;
128
135
static const char mandos_protocol_version[] = "1";
129
136
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
138
static const char sys_class_net[] = "/sys/class/net";
132
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
133
143
134
144
/* Doubly linked list that need to be circularly linked when used */
135
145
typedef struct server{
136
146
const char *ip;
137
uint16_t port;
147
in_port_t port;
138
148
AvahiIfIndex if_index;
139
149
int af;
140
150
struct timespec last_seen;
165
175
166
176
/* Function to use when printing errors */
167
177
void perror_plus(const char *print_text){
178
int e = errno;
168
179
fprintf(stderr, "Mandos plugin %s: ",
169
180
program_invocation_short_name);
181
errno = e;
170
182
perror(print_text);
171
183
}
172
184
185
__attribute__((format (gnu_printf, 2, 3)))
186
int fprintf_plus(FILE *stream, const char *format, ...){
187
va_list ap;
188
va_start (ap, format);
189
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
}
194
173
195
/*
174
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
197
* bytes. "buffer_capacity" is how much is currently allocated,
176
198
* "buffer_length" is how much is already used.
177
199
*/
178
200
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
201
size_t buffer_capacity){
180
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
204
if(buffer == NULL){
188
210
}
189
211
190
212
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
194
215
int ret;
195
216
server *new_server = malloc(sizeof(server));
196
217
if(new_server == NULL){
197
218
perror_plus("malloc");
198
return -1;
219
return false;
199
220
}
200
221
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
222
.port = port,
223
.if_index = if_index,
224
.af = af };
204
225
if(new_server->ip == NULL){
205
226
perror_plus("strdup");
206
return -1;
227
return false;
207
228
}
208
229
/* Special case of first server */
209
230
if (mc.current_server == NULL){
220
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
242
if(ret == -1){
222
243
perror_plus("clock_gettime");
223
return -1;
244
return false;
224
245
}
225
return 0;
246
return true;
226
247
}
227
248
228
249
/*
229
250
* Initialize GPGME.
230
251
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
233
254
gpgme_error_t rc;
234
255
gpgme_engine_info_t engine_info;
235
256
250
271
251
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
273
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
255
276
return false;
256
277
}
257
278
258
279
rc = gpgme_op_import(mc.ctx, pgp_data);
259
280
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
262
283
return false;
263
284
}
264
285
271
292
}
272
293
273
294
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
275
296
}
276
297
277
298
/* Init GPGME */
278
299
gpgme_check_version(NULL);
279
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
301
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
283
304
return false;
284
305
}
285
306
286
307
/* Set GPGME home directory for the OpenPGP engine only */
287
308
rc = gpgme_get_engine_info(&engine_info);
288
309
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
291
312
return false;
292
313
}
293
314
while(engine_info != NULL){
299
320
engine_info = engine_info->next;
300
321
}
301
322
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
303
325
return false;
304
326
}
305
327
306
328
/* Create new GPGME "context" */
307
329
rc = gpgme_new(&(mc.ctx));
308
330
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
311
334
return false;
312
335
}
313
336
332
355
ssize_t plaintext_length = 0;
333
356
334
357
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
359
}
337
360
338
361
/* Create new GPGME data buffer from memory cryptotext */
339
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
363
0);
341
364
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
344
367
return -1;
345
368
}
346
369
347
370
/* Create new empty GPGME data buffer for the plaintext */
348
371
rc = gpgme_data_new(&dh_plain);
349
372
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
352
376
gpgme_data_release(dh_crypto);
353
377
return -1;
354
378
}
357
381
data buffer */
358
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
383
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
362
386
plaintext_length = -1;
363
387
if(debug){
364
388
gpgme_decrypt_result_t result;
365
389
result = gpgme_op_decrypt_result(mc.ctx);
366
390
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
392
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
373
397
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
399
}
376
400
gpgme_recipient_t recipient;
377
401
recipient = result->recipients;
378
402
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
403
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
407
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
385
410
recipient = recipient->next;
386
411
}
387
412
}
390
415
}
391
416
392
417
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
419
}
395
420
396
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
428
*plaintext = NULL;
404
429
while(true){
405
430
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
408
433
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
412
437
}
413
438
414
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
452
}
428
453
429
454
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
431
456
for(ssize_t i = 0; i < plaintext_length; i++){
432
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
458
}
445
470
}
446
471
447
472
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
450
474
if(ret == NULL)
451
475
ret = "(unknown)";
452
476
return ret;
455
479
/* GnuTLS log function callback */
456
480
static void debuggnutls(__attribute__((unused)) int level,
457
481
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
459
483
}
460
484
461
485
static int init_gnutls_global(const char *pubkeyfilename,
463
487
int ret;
464
488
465
489
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
491
}
468
492
469
493
ret = gnutls_global_init();
470
494
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
473
497
return -1;
474
498
}
475
499
484
508
/* OpenPGP credentials */
485
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
510
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
489
513
gnutls_global_deinit();
490
514
return -1;
491
515
}
492
516
493
517
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
497
522
}
498
523
499
524
ret = gnutls_certificate_set_openpgp_key_file
500
525
(mc.cred, pubkeyfilename, seckeyfilename,
501
526
GNUTLS_OPENPGP_FMT_BASE64);
502
527
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
safer_gnutls_strerror(ret));
508
533
goto globalfail;
509
534
}
510
535
511
536
/* GnuTLS server initialization */
512
537
ret = gnutls_dh_params_init(&mc.dh_params);
513
538
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
516
542
goto globalfail;
517
543
}
518
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
545
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
522
548
goto globalfail;
523
549
}
524
550
544
570
}
545
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
572
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
549
576
}
550
577
551
578
{
558
585
}
559
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
587
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
564
591
gnutls_deinit(*session);
565
592
return -1;
566
593
}
575
602
}
576
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
604
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
580
607
gnutls_deinit(*session);
581
608
return -1;
582
609
}
594
621
__attribute__((unused)) const char *txt){}
595
622
596
623
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
598
625
AvahiIfIndex if_index,
599
626
int af){
600
627
int ret, tcp_sd = -1;
627
654
pf = PF_INET;
628
655
break;
629
656
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
658
errno = EINVAL;
632
659
return -1;
633
660
}
638
665
}
639
666
640
667
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
643
670
}
644
671
645
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
698
}
672
699
if(ret == 0){
673
700
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
702
errno = e;
676
703
goto mandos_end;
677
704
}
678
705
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
706
to.in6.sin6_port = htons(port);
683
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
709
-Wunreachable-code*/
686
710
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
689
713
errno = EINVAL;
690
714
goto mandos_end;
691
715
}
709
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
734
perror_plus("if_indextoname");
711
735
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
714
738
}
715
739
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
718
742
}
719
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
754
perror_plus("inet_ntop");
731
755
} else {
732
756
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
758
}
735
759
}
736
760
}
764
788
while(true){
765
789
size_t out_size = strlen(out);
766
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
791
out_size - written));
768
792
if(ret == -1){
769
793
int e = errno;
770
794
perror_plus("write");
790
814
}
791
815
792
816
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
818
}
795
819
796
820
if(quit_now){
798
822
goto mandos_end;
799
823
}
800
824
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
830
804
831
if(quit_now){
805
832
errno = EINTR;
816
843
817
844
if(ret != GNUTLS_E_SUCCESS){
818
845
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
847
gnutls_perror(ret);
821
848
}
822
849
errno = EPROTO;
826
853
/* Read OpenPGP packet that contains the wanted password */
827
854
828
855
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
831
858
}
832
859
833
860
while(true){
838
865
}
839
866
840
867
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
868
buffer_capacity);
842
869
if(buffer_capacity == 0){
843
870
int e = errno;
844
871
perror_plus("incbuffer");
871
898
}
872
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
900
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
875
903
gnutls_perror(ret);
876
904
errno = EPROTO;
877
905
goto mandos_end;
878
906
}
879
907
break;
880
908
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
883
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
912
errno = EIO;
885
913
goto mandos_end;
890
918
}
891
919
892
920
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
894
922
}
895
923
896
924
if(quit_now){
908
936
909
937
if(buffer_length > 0){
910
938
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
940
&decrypted_buffer);
914
941
if(decrypted_buffer_size >= 0){
915
942
926
953
if(ret == 0 and ferror(stdout)){
927
954
int e = errno;
928
955
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
931
958
}
932
959
errno = e;
933
960
goto mandos_end;
978
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1006
flags,
980
1007
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
982
1011
983
1012
/* Called whenever a service has been resolved successfully or
984
1013
timed out */
990
1019
switch(event){
991
1020
default:
992
1021
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
996
1026
break;
997
1027
998
1028
case AVAHI_RESOLVER_FOUND:
1000
1030
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1031
avahi_address_snprint(ip, sizeof(ip), address);
1002
1032
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1033
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1035
host_name, ip, (intmax_t)interface, port);
1006
1036
}
1007
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
1008
1039
avahi_proto_to_af(proto));
1009
1040
if(ret == 0){
1010
1041
avahi_simple_poll_quit(mc.simple_poll);
1011
1042
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
1014
1048
}
1015
1049
}
1016
1050
}
1027
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1062
flags,
1029
1063
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
1031
1067
1032
1068
/* Called whenever a new services becomes available on the LAN or
1033
1069
is removed from the LAN */
1040
1076
default:
1041
1077
case AVAHI_BROWSER_FAILURE:
1042
1078
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1045
1081
avahi_simple_poll_quit(mc.simple_poll);
1046
1082
return;
1047
1083
1054
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1091
name, type, domain, protocol, 0,
1056
1092
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
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)));
1059
1096
break;
1060
1097
1061
1098
case AVAHI_BROWSER_REMOVE:
1064
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1103
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1068
1106
}
1069
1107
break;
1070
1108
}
1085
1123
errno = old_errno;
1086
1124
}
1087
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1088
1192
/*
1089
1193
* This function determines if a directory entry in /sys/class/net
1090
1194
* corresponds to an acceptable network device.
1091
1195
* (This function is passed to scandir(3) as a filter function.)
1092
1196
*/
1093
1197
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1198
if(if_entry->d_name[0] == '.'){
1097
1199
return 0;
1098
1200
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
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;
1189
1213
}
1190
1214
return 1;
1191
1215
}
1192
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);
1247
}
1248
1193
1249
int notdotentries(const struct dirent *direntry){
1194
1250
/* Skip "." and ".." */
1195
1251
if(direntry->d_name[0] == '.'
1201
1257
return 1;
1202
1258
}
1203
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
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);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1204
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
1322
int ret;
1206
1323
struct timespec now;
1210
1327
while(true){
1211
1328
if(mc.current_server == NULL){
1212
1329
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1215
1332
}
1216
1333
ret = avahi_simple_poll_iterate(s, -1);
1217
1334
} else {
1218
1335
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1221
1338
}
1222
1339
/* the current time */
1223
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1239
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1357
1241
1358
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1243
1361
}
1244
1362
1245
1363
if(block_time <= 0){
1265
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1384
}
1267
1385
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1386
if (ret > 0 or errno != EINTR){
1269
1387
return (ret != 1) ? ret : 0;
1270
1388
}
1271
1389
}
1272
1390
}
1273
1391
}
1274
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
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1468
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1539
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1576
}
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
1748
}
1749
1275
1750
int main(int argc, char *argv[]){
1276
1751
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1752
error_t ret_errno;
1278
1753
int ret;
1279
1754
intmax_t tmpmax;
1280
1755
char *tmp;
1281
1756
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
1288
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1762
bool tempdir_created = false;
1290
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1764
const char *seckey = PATHDIR "/" SECKEY;
1292
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1293
1768
1294
1769
bool gnutls_initialized = false;
1295
1770
bool gpgme_initialized = false;
1357
1832
.group = 2 },
1358
1833
{ .name = "retry", .key = 132,
1359
1834
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1835
.doc = "Retry interval used when denied by the Mandos server",
1836
.group = 2 },
1837
{ .name = "network-hook-dir", .key = 133,
1838
.arg = "DIR",
1839
.doc = "Directory where network hooks are located",
1361
1840
.group = 2 },
1362
1841
/*
1363
1842
* These reproduce what we would get without ARGP_NO_HELP
1382
1861
connect_to = arg;
1383
1862
break;
1384
1863
case 'i': /* --interface */
1385
interface = arg;
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
1386
1869
break;
1387
1870
case 's': /* --seckey */
1388
1871
seckey = arg;
1417
1900
argp_error(state, "Bad retry interval");
1418
1901
}
1419
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
break;
1420
1906
/*
1421
1907
* These reproduce what we would get without ARGP_NO_HELP
1422
1908
*/
1428
1914
argp_state_help(state, state->out_stream,
1429
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1916
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1918
exit(argp_err_exit_status);
1433
1919
break;
1434
1920
default:
1461
1947
{
1462
1948
/* Work around Debian bug #633582:
1463
1949
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1950
1466
1951
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
2015
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
2019
}
2020
}
2021
2022
/* Run network hooks */
2023
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2027
if(interfaces_hooks == NULL){
2028
perror_plus("malloc");
2029
goto end;
2030
}
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
1518
2039
}
1519
2040
}
1520
2041
1521
2042
if(not debug){
1522
2043
avahi_set_log_function(empty_log);
1523
2044
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2045
1550
2046
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2047
from the signal handler */
1553
2049
srand((unsigned int) time(NULL));
1554
2050
mc.simple_poll = avahi_simple_poll_new();
1555
2051
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2052
fprintf_plus(stderr,
2053
"Avahi: Failed to create simple poll object.\n");
1557
2054
exitcode = EX_UNAVAILABLE;
1558
2055
goto end;
1559
2056
}
1621
2118
}
1622
2119
}
1623
2120
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
2121
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2124
/* Look for any good interfaces */
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2126
alphasort);
2127
if(ret >= 1){
2128
/* Add all found interfaces to interfaces list */
2129
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2131
direntries[i]->d_name);
2132
if(ret_errno != 0){
2133
perror_plus("argz_add");
2134
continue;
2135
}
2136
if(debug){
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
direntries[i]->d_name);
2139
}
2140
}
2141
free(direntries);
1760
2142
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
2143
free(direntries);
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2145
exitcode = EXIT_FAILURE;
2146
goto end;
2147
}
2148
}
2149
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2162
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2164
interface))){
2165
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2167
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2171
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2175
}
1765
2176
}
1766
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
if(debug and (interfaces_to_take_down == NULL)){
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
}
1767
2184
}
1768
2185
1769
2186
if(quit_now){
1772
2189
1773
2190
ret = init_gnutls_global(pubkey, seckey);
1774
2191
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2193
exitcode = EX_UNAVAILABLE;
1777
2194
goto end;
1778
2195
} else {
1794
2211
}
1795
2212
1796
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2214
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2215
exitcode = EX_UNAVAILABLE;
1799
2216
goto end;
1800
2217
} else {
1809
2226
/* Connect directly, do not use Zeroconf */
1810
2227
/* (Mainly meant for debugging) */
1811
2228
char *address = strrchr(connect_to, ':');
2229
1812
2230
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2231
fprintf_plus(stderr, "No colon in address\n");
1814
2232
exitcode = EX_USAGE;
1815
2233
goto end;
1816
2234
}
1819
2237
goto end;
1820
2238
}
1821
2239
1822
uint16_t port;
2240
in_port_t port;
1823
2241
errno = 0;
1824
2242
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2243
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2244
or tmpmax != (in_port_t)tmpmax){
2245
fprintf_plus(stderr, "Bad port number\n");
1828
2246
exitcode = EX_USAGE;
1829
2247
goto end;
1830
2248
}
1833
2251
goto end;
1834
2252
}
1835
2253
1836
port = (uint16_t)tmpmax;
2254
port = (in_port_t)tmpmax;
1837
2255
*address = '\0';
1838
2256
/* Colon in address indicates IPv6 */
1839
2257
int af;
1860
2278
break;
1861
2279
}
1862
2280
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
(int)retry_interval);
1865
2283
}
1866
2284
sleep((int)retry_interval);
1867
2285
}
1869
2287
if (not quit_now){
1870
2288
exitcode = EXIT_SUCCESS;
1871
2289
}
1872
2290
1873
2291
goto end;
1874
2292
}
1875
2293
1889
2307
/* Allocate a new server */
1890
2308
mc.server = avahi_server_new(avahi_simple_poll_get
1891
2309
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2310
NULL, &ret_errno);
1893
2311
1894
2312
/* Free the Avahi configuration data */
1895
2313
avahi_server_config_free(&config);
1897
2315
1898
2316
/* Check if creating the Avahi server object succeeded */
1899
2317
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
1902
2320
exitcode = EX_UNAVAILABLE;
1903
2321
goto end;
1904
2322
}
1912
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
2331
NULL, 0, browse_callback, NULL);
1914
2332
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
avahi_strerror(avahi_server_errno(mc.server)));
1917
2335
exitcode = EX_UNAVAILABLE;
1918
2336
goto end;
1919
2337
}
1925
2343
/* Run the main loop */
1926
2344
1927
2345
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2347
}
1930
2348
1931
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
2350
(int)(retry_interval * 1000));
1933
2351
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
(ret == 0) ? "successfully" : "with error");
1936
2354
}
1937
2355
1938
2356
end:
1939
2357
1940
2358
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2360
}
1943
2361
1944
2362
/* Cleanup things */
1960
2378
if(gpgme_initialized){
1961
2379
gpgme_release(mc.ctx);
1962
2380
}
1963
2381
1964
2382
/* Cleans up the circular linked list of Mandos servers the client
1965
2383
has seen */
1966
2384
if(mc.current_server != NULL){
1972
2390
}
1973
2391
}
1974
2392
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2393
/* Re-raise priviliges */
2394
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
1992
2411
}
1993
2412
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2003
2416
}
2004
2417
}
2418
2419
lower_privileges_permanently();
2005
2420
}
2006
2421
2422
free(interfaces_to_take_down);
2423
free(interfaces_hooks);
2424
2007
2425
/* Removes the GPGME temp directory and all files inside */
2008
2426
if(tempdir_created){
2009
2427
struct dirent **direntries = NULL;
2022
2440
}
2023
2441
ret = remove(fullname);
2024
2442
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2027
2445
}
2028
2446
free(fullname);
2029
2447
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0