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- Committer: Teddy Hogeborn
- Date: 2012-06-14 21:42:44 UTC
- Revision ID: teddy@recompile.se-20120614214244-meh2hr7pg0p0fek2
* plugins.d/mandos-client.c: Only print message about nonexisting
network hook directory in debug mode.
network hook directory in debug mode.
- 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){
187
209
return buffer_capacity;
188
210
}
189
211
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
212
/* Add server to set of servers to retry periodically */
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
193
215
int ret;
194
216
server *new_server = malloc(sizeof(server));
195
217
if(new_server == NULL){
196
218
perror_plus("malloc");
197
return -1;
219
return false;
198
220
}
199
221
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
222
.port = port,
223
.if_index = if_index,
224
.af = af };
203
225
if(new_server->ip == NULL){
204
226
perror_plus("strdup");
205
return -1;
227
return false;
206
228
}
207
/* unique case of first server */
229
/* Special case of first server */
208
230
if (mc.current_server == NULL){
209
231
new_server->next = new_server;
210
232
new_server->prev = new_server;
211
233
mc.current_server = new_server;
212
/* Placing the new server last in the list */
234
/* Place the new server last in the list */
213
235
} else {
214
236
new_server->next = mc.current_server;
215
237
new_server->prev = mc.current_server->prev;
219
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
242
if(ret == -1){
221
243
perror_plus("clock_gettime");
222
return -1;
244
return false;
223
245
}
224
return 0;
246
return true;
225
247
}
226
248
227
249
/*
228
250
* Initialize GPGME.
229
251
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
232
254
gpgme_error_t rc;
233
255
gpgme_engine_info_t engine_info;
234
256
249
271
250
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
273
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
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));
254
276
return false;
255
277
}
256
278
257
279
rc = gpgme_op_import(mc.ctx, pgp_data);
258
280
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
261
283
return false;
262
284
}
263
285
270
292
}
271
293
272
294
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
274
296
}
275
297
276
298
/* Init GPGME */
277
299
gpgme_check_version(NULL);
278
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
301
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
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));
282
304
return false;
283
305
}
284
306
285
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
286
308
rc = gpgme_get_engine_info(&engine_info);
287
309
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
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));
290
312
return false;
291
313
}
292
314
while(engine_info != NULL){
298
320
engine_info = engine_info->next;
299
321
}
300
322
if(engine_info == NULL){
301
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);
302
325
return false;
303
326
}
304
327
305
328
/* Create new GPGME "context" */
306
329
rc = gpgme_new(&(mc.ctx));
307
330
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
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));
310
334
return false;
311
335
}
312
336
331
355
ssize_t plaintext_length = 0;
332
356
333
357
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
359
}
336
360
337
361
/* Create new GPGME data buffer from memory cryptotext */
338
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
363
0);
340
364
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
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));
343
367
return -1;
344
368
}
345
369
346
370
/* Create new empty GPGME data buffer for the plaintext */
347
371
rc = gpgme_data_new(&dh_plain);
348
372
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
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));
351
376
gpgme_data_release(dh_crypto);
352
377
return -1;
353
378
}
356
381
data buffer */
357
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
383
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
361
386
plaintext_length = -1;
362
387
if(debug){
363
388
gpgme_decrypt_result_t result;
364
389
result = gpgme_op_decrypt_result(mc.ctx);
365
390
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
392
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
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);
372
397
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
399
}
375
400
gpgme_recipient_t recipient;
376
401
recipient = result->recipients;
377
402
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "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");
384
410
recipient = recipient->next;
385
411
}
386
412
}
389
415
}
390
416
391
417
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
419
}
394
420
395
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
428
*plaintext = NULL;
403
429
while(true){
404
430
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
407
433
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
411
437
}
412
438
413
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
452
}
427
453
428
454
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
430
456
for(ssize_t i = 0; i < plaintext_length; i++){
431
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
458
}
444
470
}
445
471
446
472
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
449
474
if(ret == NULL)
450
475
ret = "(unknown)";
451
476
return ret;
454
479
/* GnuTLS log function callback */
455
480
static void debuggnutls(__attribute__((unused)) int level,
456
481
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
458
483
}
459
484
460
485
static int init_gnutls_global(const char *pubkeyfilename,
462
487
int ret;
463
488
464
489
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
491
}
467
492
468
493
ret = gnutls_global_init();
469
494
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
472
497
return -1;
473
498
}
474
499
483
508
/* OpenPGP credentials */
484
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
510
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
488
513
gnutls_global_deinit();
489
514
return -1;
490
515
}
491
516
492
517
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
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);
496
522
}
497
523
498
524
ret = gnutls_certificate_set_openpgp_key_file
499
525
(mc.cred, pubkeyfilename, seckeyfilename,
500
526
GNUTLS_OPENPGP_FMT_BASE64);
501
527
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
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));
507
533
goto globalfail;
508
534
}
509
535
510
536
/* GnuTLS server initialization */
511
537
ret = gnutls_dh_params_init(&mc.dh_params);
512
538
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
515
542
goto globalfail;
516
543
}
517
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
545
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
521
548
goto globalfail;
522
549
}
523
550
543
570
}
544
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
572
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
548
576
}
549
577
550
578
{
557
585
}
558
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
587
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
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));
563
591
gnutls_deinit(*session);
564
592
return -1;
565
593
}
574
602
}
575
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
604
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
579
607
gnutls_deinit(*session);
580
608
return -1;
581
609
}
593
621
__attribute__((unused)) const char *txt){}
594
622
595
623
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
597
625
AvahiIfIndex if_index,
598
626
int af){
599
627
int ret, tcp_sd = -1;
626
654
pf = PF_INET;
627
655
break;
628
656
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
658
errno = EINVAL;
631
659
return -1;
632
660
}
637
665
}
638
666
639
667
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
642
670
}
643
671
644
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
698
}
671
699
if(ret == 0){
672
700
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
702
errno = e;
675
703
goto mandos_end;
676
704
}
677
705
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
706
to.in6.sin6_port = htons(port);
682
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
709
-Wunreachable-code*/
685
710
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
688
713
errno = EINVAL;
689
714
goto mandos_end;
690
715
}
708
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
734
perror_plus("if_indextoname");
710
735
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
713
738
}
714
739
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
717
742
}
718
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
754
perror_plus("inet_ntop");
730
755
} else {
731
756
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
758
}
734
759
}
735
760
}
763
788
while(true){
764
789
size_t out_size = strlen(out);
765
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
791
out_size - written));
767
792
if(ret == -1){
768
793
int e = errno;
769
794
perror_plus("write");
789
814
}
790
815
791
816
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
818
}
794
819
795
820
if(quit_now){
797
822
goto mandos_end;
798
823
}
799
824
800
/* Spurious warning from -Wint-to-pointer-cast */
801
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);
802
830
803
831
if(quit_now){
804
832
errno = EINTR;
815
843
816
844
if(ret != GNUTLS_E_SUCCESS){
817
845
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
847
gnutls_perror(ret);
820
848
}
821
849
errno = EPROTO;
825
853
/* Read OpenPGP packet that contains the wanted password */
826
854
827
855
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
830
858
}
831
859
832
860
while(true){
837
865
}
838
866
839
867
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
868
buffer_capacity);
841
869
if(buffer_capacity == 0){
842
870
int e = errno;
843
871
perror_plus("incbuffer");
870
898
}
871
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
900
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
874
903
gnutls_perror(ret);
875
904
errno = EPROTO;
876
905
goto mandos_end;
877
906
}
878
907
break;
879
908
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
882
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
912
errno = EIO;
884
913
goto mandos_end;
889
918
}
890
919
891
920
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
893
922
}
894
923
895
924
if(quit_now){
907
936
908
937
if(buffer_length > 0){
909
938
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
940
&decrypted_buffer);
913
941
if(decrypted_buffer_size >= 0){
914
942
925
953
if(ret == 0 and ferror(stdout)){
926
954
int e = errno;
927
955
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
930
958
}
931
959
errno = e;
932
960
goto mandos_end;
977
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1006
flags,
979
1007
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
981
1011
982
1012
/* Called whenever a service has been resolved successfully or
983
1013
timed out */
989
1019
switch(event){
990
1020
default:
991
1021
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
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)));
995
1026
break;
996
1027
997
1028
case AVAHI_RESOLVER_FOUND:
999
1030
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1031
avahi_address_snprint(ip, sizeof(ip), address);
1001
1032
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
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);
1005
1036
}
1006
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
1007
1039
avahi_proto_to_af(proto));
1008
1040
if(ret == 0){
1009
1041
avahi_simple_poll_quit(mc.simple_poll);
1010
1042
} else {
1011
ret = add_server(ip, port, interface,
1012
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
}
1013
1048
}
1014
1049
}
1015
1050
}
1026
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1062
flags,
1028
1063
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
1030
1067
1031
1068
/* Called whenever a new services becomes available on the LAN or
1032
1069
is removed from the LAN */
1039
1076
default:
1040
1077
case AVAHI_BROWSER_FAILURE:
1041
1078
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1044
1081
avahi_simple_poll_quit(mc.simple_poll);
1045
1082
return;
1046
1083
1053
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1091
name, type, domain, protocol, 0,
1055
1092
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
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)));
1058
1096
break;
1059
1097
1060
1098
case AVAHI_BROWSER_REMOVE:
1063
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1103
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1067
1106
}
1068
1107
break;
1069
1108
}
1084
1123
errno = old_errno;
1085
1124
}
1086
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
1087
1192
/*
1088
1193
* This function determines if a directory entry in /sys/class/net
1089
1194
* corresponds to an acceptable network device.
1090
1195
* (This function is passed to scandir(3) as a filter function.)
1091
1196
*/
1092
1197
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1198
if(if_entry->d_name[0] == '.'){
1096
1199
return 0;
1097
1200
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
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;
1188
1213
}
1189
1214
return 1;
1190
1215
}
1191
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
1192
1249
int notdotentries(const struct dirent *direntry){
1193
1250
/* Skip "." and ".." */
1194
1251
if(direntry->d_name[0] == '.'
1200
1257
return 1;
1201
1258
}
1202
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
1203
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1322
int ret;
1205
1323
struct timespec now;
1206
1324
struct timespec waited_time;
1207
1325
intmax_t block_time;
1208
1326
1209
1327
while(true){
1210
1328
if(mc.current_server == NULL){
1211
1329
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1214
1332
}
1215
1333
ret = avahi_simple_poll_iterate(s, -1);
1216
1334
} else {
1217
1335
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1220
1338
}
1221
1339
/* the current time */
1222
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1236
1354
block_time = ((retry_interval
1237
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1357
1240
1358
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1242
1361
}
1243
1362
1244
1363
if(block_time <= 0){
1245
1364
ret = start_mandos_communication(mc.current_server->ip,
1246
1365
mc.current_server->port,
1264
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1384
}
1266
1385
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1386
if (ret > 0 or errno != EINTR){
1268
1387
return (ret != 1) ? ret : 0;
1269
1388
}
1270
1389
}
1271
1390
}
1272
1391
}
1273
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
1274
1750
int main(int argc, char *argv[]){
1275
1751
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1752
error_t ret_errno;
1277
1753
int ret;
1278
1754
intmax_t tmpmax;
1279
1755
char *tmp;
1280
1756
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
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;
1287
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1288
1762
bool tempdir_created = false;
1289
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
1764
const char *seckey = PATHDIR "/" SECKEY;
1291
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1292
1768
1293
1769
bool gnutls_initialized = false;
1294
1770
bool gpgme_initialized = false;
1356
1832
.group = 2 },
1357
1833
{ .name = "retry", .key = 132,
1358
1834
.arg = "SECONDS",
1359
.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",
1360
1840
.group = 2 },
1361
1841
/*
1362
1842
* These reproduce what we would get without ARGP_NO_HELP
1381
1861
connect_to = arg;
1382
1862
break;
1383
1863
case 'i': /* --interface */
1384
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
}
1385
1869
break;
1386
1870
case 's': /* --seckey */
1387
1871
seckey = arg;
1411
1895
errno = 0;
1412
1896
retry_interval = strtod(arg, &tmp);
1413
1897
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1898
or (retry_interval * 1000) > INT_MAX
1899
or retry_interval < 0){
1415
1900
argp_error(state, "Bad retry interval");
1416
1901
}
1417
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
break;
1418
1906
/*
1419
1907
* These reproduce what we would get without ARGP_NO_HELP
1420
1908
*/
1426
1914
argp_state_help(state, state->out_stream,
1427
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1916
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1918
exit(argp_err_exit_status);
1431
1919
break;
1432
1920
default:
1459
1947
{
1460
1948
/* Work around Debian bug #633582:
1461
1949
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1950
1464
1951
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
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
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2025
interfaces, interfaces_size);
2026
if(ret_errno != 0){
2027
errno = ret_errno;
2028
perror_plus("argz_append");
2029
goto end;
2030
}
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2032
if(not run_network_hooks("start", interfaces_hooks, delay)){
2033
goto end;
1512
2034
}
1513
2035
}
1514
2036
1515
2037
if(not debug){
1516
2038
avahi_set_log_function(empty_log);
1517
2039
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
2040
1544
2041
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2042
from the signal handler */
1547
2044
srand((unsigned int) time(NULL));
1548
2045
mc.simple_poll = avahi_simple_poll_new();
1549
2046
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2047
fprintf_plus(stderr,
2048
"Avahi: Failed to create simple poll object.\n");
1551
2049
exitcode = EX_UNAVAILABLE;
1552
2050
goto end;
1553
2051
}
1615
2113
}
1616
2114
}
1617
2115
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
2116
/* If no interfaces were specified, make a list */
2117
if(interfaces == NULL){
2118
struct dirent **direntries;
2119
/* Look for any good interfaces */
2120
ret = scandir(sys_class_net, &direntries, good_interface,
2121
alphasort);
2122
if(ret >= 1){
2123
/* Add all found interfaces to interfaces list */
2124
for(int i = 0; i < ret; ++i){
2125
ret_errno = argz_add(&interfaces, &interfaces_size,
2126
direntries[i]->d_name);
2127
if(ret_errno != 0){
2128
perror_plus("argz_add");
2129
continue;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2133
direntries[i]->d_name);
2134
}
2135
}
2136
free(direntries);
1754
2137
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
2138
free(direntries);
2139
fprintf_plus(stderr, "Could not find a network interface\n");
2140
exitcode = EXIT_FAILURE;
2141
goto end;
2142
}
2143
}
2144
2145
/* If we only got one interface, explicitly use only that one */
2146
if(argz_count(interfaces, interfaces_size) == 1){
2147
if(debug){
2148
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2149
interfaces);
2150
}
2151
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2152
}
2153
2154
/* Bring up interfaces which are down */
2155
if(not (argz_count(interfaces, interfaces_size) == 1
2156
and strcmp(interfaces, "none") == 0)){
2157
char *interface = NULL;
2158
while((interface = argz_next(interfaces, interfaces_size,
2159
interface))){
2160
bool interface_was_up = interface_is_up(interface);
2161
ret = bring_up_interface(interface, delay);
2162
if(not interface_was_up){
2163
if(ret != 0){
2164
errno = ret;
2165
perror_plus("Failed to bring up interface");
2166
} else {
2167
ret_errno = argz_add(&interfaces_to_take_down,
2168
&interfaces_to_take_down_size,
2169
interface);
2170
}
1759
2171
}
1760
2172
}
2173
free(interfaces);
2174
interfaces = NULL;
2175
interfaces_size = 0;
2176
if(debug and (interfaces_to_take_down == NULL)){
2177
fprintf_plus(stderr, "No interfaces were brought up\n");
2178
}
1761
2179
}
1762
2180
1763
2181
if(quit_now){
1766
2184
1767
2185
ret = init_gnutls_global(pubkey, seckey);
1768
2186
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2187
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2188
exitcode = EX_UNAVAILABLE;
1771
2189
goto end;
1772
2190
} else {
1788
2206
}
1789
2207
1790
2208
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2209
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2210
exitcode = EX_UNAVAILABLE;
1793
2211
goto end;
1794
2212
} else {
1803
2221
/* Connect directly, do not use Zeroconf */
1804
2222
/* (Mainly meant for debugging) */
1805
2223
char *address = strrchr(connect_to, ':');
2224
1806
2225
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2226
fprintf_plus(stderr, "No colon in address\n");
1808
2227
exitcode = EX_USAGE;
1809
2228
goto end;
1810
2229
}
1813
2232
goto end;
1814
2233
}
1815
2234
1816
uint16_t port;
2235
in_port_t port;
1817
2236
errno = 0;
1818
2237
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2238
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2239
or tmpmax != (in_port_t)tmpmax){
2240
fprintf_plus(stderr, "Bad port number\n");
1822
2241
exitcode = EX_USAGE;
1823
2242
goto end;
1824
2243
}
1827
2246
goto end;
1828
2247
}
1829
2248
1830
port = (uint16_t)tmpmax;
2249
port = (in_port_t)tmpmax;
1831
2250
*address = '\0';
1832
address = connect_to;
1833
2251
/* Colon in address indicates IPv6 */
1834
2252
int af;
1835
if(strchr(address, ':') != NULL){
2253
if(strchr(connect_to, ':') != NULL){
1836
2254
af = AF_INET6;
2255
/* Accept [] around IPv6 address - see RFC 5952 */
2256
if(connect_to[0] == '[' and address[-1] == ']')
2257
{
2258
connect_to++;
2259
address[-1] = '\0';
2260
}
1837
2261
} else {
1838
2262
af = AF_INET;
1839
2263
}
2264
address = connect_to;
1840
2265
1841
2266
if(quit_now){
1842
2267
goto end;
1843
2268
}
1844
2269
1845
2270
while(not quit_now){
1846
2271
ret = start_mandos_communication(address, port, if_index, af);
1847
2272
if(quit_now or ret == 0){
1848
2273
break;
1849
2274
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
2275
if(debug){
2276
fprintf_plus(stderr, "Retrying in %d seconds\n",
2277
(int)retry_interval);
2278
}
2279
sleep((int)retry_interval);
2280
}
2281
1853
2282
if (not quit_now){
1854
2283
exitcode = EXIT_SUCCESS;
1855
2284
}
1856
2285
1857
2286
goto end;
1858
2287
}
1859
2288
1873
2302
/* Allocate a new server */
1874
2303
mc.server = avahi_server_new(avahi_simple_poll_get
1875
2304
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2305
NULL, &ret_errno);
1877
2306
1878
2307
/* Free the Avahi configuration data */
1879
2308
avahi_server_config_free(&config);
1881
2310
1882
2311
/* Check if creating the Avahi server object succeeded */
1883
2312
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2313
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2314
avahi_strerror(ret_errno));
1886
2315
exitcode = EX_UNAVAILABLE;
1887
2316
goto end;
1888
2317
}
1896
2325
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
2326
NULL, 0, browse_callback, NULL);
1898
2327
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2328
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2329
avahi_strerror(avahi_server_errno(mc.server)));
1901
2330
exitcode = EX_UNAVAILABLE;
1902
2331
goto end;
1903
2332
}
1909
2338
/* Run the main loop */
1910
2339
1911
2340
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2341
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2342
}
1914
2343
1915
2344
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
2345
(int)(retry_interval * 1000));
1917
2346
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2347
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2348
(ret == 0) ? "successfully" : "with error");
1920
2349
}
1921
2350
1922
2351
end:
1923
2352
1924
2353
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2354
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2355
}
1927
2356
1928
2357
/* Cleanup things */
1944
2373
if(gpgme_initialized){
1945
2374
gpgme_release(mc.ctx);
1946
2375
}
1947
2376
1948
2377
/* Cleans up the circular linked list of Mandos servers the client
1949
2378
has seen */
1950
2379
if(mc.current_server != NULL){
1956
2385
}
1957
2386
}
1958
2387
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2388
/* Re-raise priviliges */
2389
{
2390
raise_privileges();
2391
2392
/* Run network hooks */
2393
run_network_hooks("stop", interfaces_hooks, delay);
2394
2395
/* Take down the network interfaces which were brought up */
2396
{
2397
char *interface = NULL;
2398
while((interface=argz_next(interfaces_to_take_down,
2399
interfaces_to_take_down_size,
2400
interface))){
2401
ret_errno = take_down_interface(interface);
2402
if(ret_errno != 0){
2403
errno = ret_errno;
2404
perror_plus("Failed to take down interface");
1976
2405
}
1977
2406
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
2407
if(debug and (interfaces_to_take_down == NULL)){
2408
fprintf_plus(stderr, "No interfaces needed to be taken"
2409
" down\n");
1987
2410
}
1988
2411
}
2412
2413
lower_privileges_permanently();
1989
2414
}
1990
2415
2416
free(interfaces_to_take_down);
2417
free(interfaces_hooks);
2418
1991
2419
/* Removes the GPGME temp directory and all files inside */
1992
2420
if(tempdir_created){
1993
2421
struct dirent **direntries = NULL;
1994
2422
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2423
int numentries = scandir(tempdir, &direntries, notdotentries,
2424
alphasort);
2425
if (numentries > 0){
2426
for(int i = 0; i < numentries; i++){
1998
2427
direntry = direntries[i];
1999
2428
char *fullname = NULL;
2000
2429
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2434
}
2006
2435
ret = remove(fullname);
2007
2436
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2437
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2438
strerror(errno));
2010
2439
}
2011
2440
free(fullname);
2012
2441
}
2013
2442
}
2014
2443
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2444
/* need to clean even if 0 because man page doesn't specify */
2017
2445
free(direntries);
2018
if (ret == -1){
2446
if (numentries == -1){
2019
2447
perror_plus("scandir");
2020
2448
}
2021
2449
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0