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237.25.5
(compared to revision 237.15.6)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-05 21:38:01 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150705213801-pi8vk0ovlumuj826
plugin-helpers/mandos-client-iprouteadddel.c: Fix #include lines.
(main): Fix minor typo in error message.
(main): Fix minor typo in error message.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
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() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
189
int fprintf_plus(FILE *stream, const char *format, ...){
178
190
va_list ap;
179
191
va_start (ap, format);
180
192
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
196
}
184
197
185
198
/*
187
200
* bytes. "buffer_capacity" is how much is currently allocated,
188
201
* "buffer_length" is how much is already used.
189
202
*/
203
__attribute__((nonnull, warn_unused_result))
190
204
size_t incbuffer(char **buffer, size_t buffer_length,
191
205
size_t buffer_capacity){
192
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
195
213
return 0;
196
214
}
215
*buffer = new_buf;
197
216
buffer_capacity += BUFFER_SIZE;
198
217
}
199
218
return buffer_capacity;
200
219
}
201
220
202
221
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
205
225
int ret;
206
226
server *new_server = malloc(sizeof(server));
207
227
if(new_server == NULL){
208
228
perror_plus("malloc");
209
return -1;
229
return false;
210
230
}
211
231
*new_server = (server){ .ip = strdup(ip),
212
232
.port = port,
214
234
.af = af };
215
235
if(new_server->ip == NULL){
216
236
perror_plus("strdup");
217
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
218
253
}
219
254
/* Special case of first server */
220
if (mc.current_server == NULL){
255
if(*current_server == NULL){
221
256
new_server->next = new_server;
222
257
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
258
*current_server = new_server;
225
259
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
228
263
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
237
267
}
238
268
239
269
/*
240
270
* Initialize GPGME.
241
271
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
244
277
gpgme_error_t rc;
245
278
gpgme_engine_info_t engine_info;
246
279
247
248
280
/*
249
281
* Helper function to insert pub and seckey to the engine keyring.
250
282
*/
251
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
252
284
int ret;
253
285
int fd;
254
286
gpgme_data_t pgp_data;
262
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
295
if(rc != GPG_ERR_NO_ERROR){
264
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
297
gpgme_strsource(rc), gpgme_strerror(rc));
266
298
return false;
267
299
}
268
300
269
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
270
302
if(rc != GPG_ERR_NO_ERROR){
271
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
304
gpgme_strsource(rc), gpgme_strerror(rc));
273
305
return false;
274
306
}
275
307
290
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
323
if(rc != GPG_ERR_NO_ERROR){
292
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
325
gpgme_strsource(rc), gpgme_strerror(rc));
294
326
return false;
295
327
}
296
328
298
330
rc = gpgme_get_engine_info(&engine_info);
299
331
if(rc != GPG_ERR_NO_ERROR){
300
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
333
gpgme_strsource(rc), gpgme_strerror(rc));
302
334
return false;
303
335
}
304
336
while(engine_info != NULL){
310
342
engine_info = engine_info->next;
311
343
}
312
344
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
314
347
return false;
315
348
}
316
349
317
350
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
319
352
if(rc != GPG_ERR_NO_ERROR){
320
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
323
356
return false;
324
357
}
325
358
334
367
* Decrypt OpenPGP data.
335
368
* Returns -1 on error
336
369
*/
370
__attribute__((nonnull, warn_unused_result))
337
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
338
372
size_t crypto_size,
339
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
340
375
gpgme_data_t dh_crypto, dh_plain;
341
376
gpgme_error_t rc;
342
377
ssize_t ret;
352
387
0);
353
388
if(rc != GPG_ERR_NO_ERROR){
354
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
390
gpgme_strsource(rc), gpgme_strerror(rc));
356
391
return -1;
357
392
}
358
393
360
395
rc = gpgme_data_new(&dh_plain);
361
396
if(rc != GPG_ERR_NO_ERROR){
362
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
365
400
gpgme_data_release(dh_crypto);
366
401
return -1;
367
402
}
368
403
369
404
/* Decrypt data from the cryptotext data buffer to the plaintext
370
405
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
407
if(rc != GPG_ERR_NO_ERROR){
373
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
gpgme_strsource(rc), gpgme_strerror(rc));
409
gpgme_strsource(rc), gpgme_strerror(rc));
375
410
plaintext_length = -1;
376
411
if(debug){
377
412
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
379
414
if(result == NULL){
380
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
416
} else {
382
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
383
result->unsupported_algorithm);
418
result->unsupported_algorithm);
384
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
385
result->wrong_key_usage);
420
result->wrong_key_usage);
386
421
if(result->file_name != NULL){
387
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
388
423
}
390
425
recipient = result->recipients;
391
426
while(recipient != NULL){
392
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
394
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
431
fprintf_plus(stderr, "Secret key available: %s\n",
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
398
434
recipient = recipient->next;
399
435
}
400
436
}
457
493
return plaintext_length;
458
494
}
459
495
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
463
499
if(ret == NULL)
464
500
ret = "(unknown)";
465
501
return ret;
466
502
}
467
503
468
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
469
506
static void debuggnutls(__attribute__((unused)) int level,
470
507
const char* string){
471
508
fprintf_plus(stderr, "GnuTLS: %s", string);
472
509
}
473
510
511
__attribute__((nonnull, warn_unused_result))
474
512
static int init_gnutls_global(const char *pubkeyfilename,
475
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
476
515
int ret;
477
516
478
517
if(debug){
481
520
482
521
ret = gnutls_global_init();
483
522
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
485
525
return -1;
486
526
}
487
527
494
534
}
495
535
496
536
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
498
538
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
500
541
gnutls_global_deinit();
501
542
return -1;
502
543
}
503
544
504
545
if(debug){
505
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
508
550
}
509
551
510
552
ret = gnutls_certificate_set_openpgp_key_file
511
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
512
554
GNUTLS_OPENPGP_FMT_BASE64);
513
555
if(ret != GNUTLS_E_SUCCESS){
514
556
fprintf_plus(stderr,
515
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
518
561
goto globalfail;
519
562
}
520
563
521
564
/* GnuTLS server initialization */
522
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
523
566
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
526
570
goto globalfail;
527
571
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
529
573
if(ret != GNUTLS_E_SUCCESS){
530
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
575
safer_gnutls_strerror(ret));
532
576
goto globalfail;
533
577
}
534
578
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
580
537
581
return 0;
538
582
539
583
globalfail:
540
584
541
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
542
586
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
544
588
return -1;
545
589
}
546
590
547
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
548
594
int ret;
549
595
/* GnuTLS session creation */
550
596
do {
554
600
}
555
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
602
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
559
606
}
560
607
561
608
{
562
609
const char *err;
563
610
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
565
612
if(quit_now){
566
613
gnutls_deinit(*session);
567
614
return -1;
569
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
617
if(ret != GNUTLS_E_SUCCESS){
571
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
573
621
gnutls_deinit(*session);
574
622
return -1;
575
623
}
577
625
578
626
do {
579
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
628
mc->cred);
581
629
if(quit_now){
582
630
gnutls_deinit(*session);
583
631
return -1;
585
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
634
if(ret != GNUTLS_E_SUCCESS){
587
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
636
safer_gnutls_strerror(ret));
589
637
gnutls_deinit(*session);
590
638
return -1;
591
639
}
593
641
/* ignore client certificate if any. */
594
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
643
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
597
645
598
646
return 0;
599
647
}
602
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
603
651
__attribute__((unused)) const char *txt){}
604
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
605
862
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
607
865
AvahiIfIndex if_index,
608
int af){
866
int af, mandos_context *mc){
609
867
int ret, tcp_sd = -1;
610
868
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
869
struct sockaddr_storage to;
615
870
char *buffer = NULL;
616
871
char *decrypted_buffer = NULL;
617
872
size_t buffer_length = 0;
620
875
int retval = -1;
621
876
gnutls_session_t session;
622
877
int pf; /* Protocol family */
878
bool route_added = false;
623
879
624
880
errno = 0;
625
881
641
897
return -1;
642
898
}
643
899
644
ret = init_gnutls_session(&session);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
903
bool match = false;
904
{
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
908
if(if_nametoindex(interface) == (unsigned int)if_index){
909
match = true;
910
break;
911
}
912
}
913
}
914
if(not match){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
917
if(debug){
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
921
} else {
922
fprintf_plus(stderr, "Skipping server on non-used interface"
923
" \"%s\"\n",
924
if_indextoname((unsigned int)if_index,
925
interface));
926
}
927
}
928
return -1;
929
}
930
}
931
932
ret = init_gnutls_session(&session, mc);
645
933
if(ret != 0){
646
934
return -1;
647
935
}
648
936
649
937
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
652
940
}
653
941
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
655
943
if(tcp_sd < 0){
656
944
int e = errno;
657
945
perror_plus("socket");
666
954
667
955
memset(&to, 0, sizeof(to));
668
956
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
671
959
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
674
962
}
675
963
if(ret < 0 ){
676
964
int e = errno;
685
973
goto mandos_end;
686
974
}
687
975
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
979
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
698
982
errno = EINVAL;
699
983
goto mandos_end;
700
984
}
701
985
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
987
}
704
988
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
990
}
709
991
710
992
if(quit_now){
718
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
1001
perror_plus("if_indextoname");
720
1002
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
723
1005
}
724
1006
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
726
1009
}
727
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
const char *pcret;
730
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
733
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
736
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
739
} else {
740
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
742
}
743
}
744
}
745
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
}
756
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
goto mandos_end;
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
768
1088
}
769
1089
770
1090
const char *out = mandos_protocol_version;
806
1126
goto mandos_end;
807
1127
}
808
1128
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
811
1134
812
1135
if(quit_now){
813
1136
errno = EINTR;
834
1157
/* Read OpenPGP packet that contains the wanted password */
835
1158
836
1159
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1161
" %s\n", ip);
838
1162
}
839
1163
840
1164
while(true){
878
1202
}
879
1203
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
1204
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1206
"***\n");
882
1207
gnutls_perror(ret);
883
1208
errno = EPROTO;
884
1209
goto mandos_end;
886
1211
break;
887
1212
default:
888
1213
fprintf_plus(stderr, "Unknown error while reading data from"
889
" encrypted session with Mandos server\n");
1214
" encrypted session with Mandos server\n");
890
1215
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
1216
errno = EIO;
892
1217
goto mandos_end;
916
1241
if(buffer_length > 0){
917
1242
ssize_t decrypted_buffer_size;
918
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
919
&decrypted_buffer);
1244
&decrypted_buffer, mc);
920
1245
if(decrypted_buffer_size >= 0){
921
1246
922
1247
written = 0;
933
1258
int e = errno;
934
1259
if(debug){
935
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
936
strerror(errno));
1261
strerror(errno));
937
1262
}
938
1263
errno = e;
939
1264
goto mandos_end;
948
1273
949
1274
mandos_end:
950
1275
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
951
1282
int e = errno;
952
1283
free(decrypted_buffer);
953
1284
free(buffer);
970
1301
return retval;
971
1302
}
972
1303
1304
__attribute__((nonnull))
973
1305
static void resolve_callback(AvahiSServiceResolver *r,
974
1306
AvahiIfIndex interface,
975
1307
AvahiProtocol proto,
983
1315
AVAHI_GCC_UNUSED AvahiStringList *txt,
984
1316
AVAHI_GCC_UNUSED AvahiLookupResultFlags
985
1317
flags,
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1318
void *mc){
1319
if(r == NULL){
1320
return;
1321
}
988
1322
989
1323
/* Called whenever a service has been resolved successfully or
990
1324
timed out */
991
1325
992
1326
if(quit_now){
1327
avahi_s_service_resolver_free(r);
993
1328
return;
994
1329
}
995
1330
996
1331
switch(event){
997
1332
default:
998
1333
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1334
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1335
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1336
domain,
1337
avahi_strerror(avahi_server_errno
1338
(((mandos_context*)mc)->server)));
1002
1339
break;
1003
1340
1004
1341
case AVAHI_RESOLVER_FOUND:
1007
1344
avahi_address_snprint(ip, sizeof(ip), address);
1008
1345
if(debug){
1009
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
1012
1349
}
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1351
interface,
1352
avahi_proto_to_af(proto),
1353
mc);
1015
1354
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1355
avahi_simple_poll_quit(simple_poll);
1017
1356
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1361
" list\n", name);
1362
}
1020
1363
}
1021
1364
}
1022
1365
}
1032
1375
const char *domain,
1033
1376
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
1377
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1378
void *mc){
1379
if(b == NULL){
1380
return;
1381
}
1037
1382
1038
1383
/* Called whenever a new services becomes available on the LAN or
1039
1384
is removed from the LAN */
1047
1392
case AVAHI_BROWSER_FAILURE:
1048
1393
1049
1394
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1395
avahi_strerror(avahi_server_errno
1396
(((mandos_context*)mc)->server)));
1397
avahi_simple_poll_quit(simple_poll);
1052
1398
return;
1053
1399
1054
1400
case AVAHI_BROWSER_NEW:
1057
1403
the callback function is called the Avahi server will free the
1058
1404
resolver for us. */
1059
1405
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1406
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1407
interface, protocol, name, type,
1408
domain, protocol, 0,
1409
resolve_callback, mc) == NULL)
1410
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1411
" %s\n", name,
1412
avahi_strerror(avahi_server_errno
1413
(((mandos_context*)mc)->server)));
1065
1414
break;
1066
1415
1067
1416
case AVAHI_BROWSER_REMOVE:
1070
1419
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
1420
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
1421
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1422
fprintf_plus(stderr, "No Mandos server found, still"
1423
" searching...\n");
1074
1424
}
1075
1425
break;
1076
1426
}
1085
1435
signal_received = sig;
1086
1436
int old_errno = errno;
1087
1437
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1090
1440
}
1091
1441
errno = old_errno;
1092
1442
}
1093
1443
1444
__attribute__((nonnull, warn_unused_result))
1094
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
1446
int ret;
1447
error_t ret_errno;
1096
1448
1097
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
1450
if(s < 0){
1451
ret_errno = errno;
1099
1452
perror_plus("socket");
1453
errno = ret_errno;
1100
1454
return false;
1101
1455
}
1102
1456
strcpy(ifr->ifr_name, ifname);
1103
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
1458
if(ret == -1){
1105
1459
if(debug){
1460
ret_errno = errno;
1106
1461
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1107
1463
}
1108
1464
return false;
1109
1465
}
1110
1466
return true;
1111
1467
}
1112
1468
1469
__attribute__((nonnull, warn_unused_result))
1113
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1471
1115
1472
/* Reject the loopback device */
1116
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
1474
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1476
ifname);
1119
1477
}
1120
1478
return false;
1121
1479
}
1122
1480
/* Accept point-to-point devices only if connect_to is specified */
1123
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
1482
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1126
1485
}
1127
1486
return true;
1128
1487
}
1129
1488
/* Otherwise, reject non-broadcast-capable devices */
1130
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
1490
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1133
1493
}
1134
1494
return false;
1135
1495
}
1136
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
1497
if(ifr->ifr_flags & IFF_NOARP){
1138
1498
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1500
ifname);
1140
1501
}
1141
1502
return false;
1142
1503
}
1153
1514
* corresponds to an acceptable network device.
1154
1515
* (This function is passed to scandir(3) as a filter function.)
1155
1516
*/
1517
__attribute__((nonnull, warn_unused_result))
1156
1518
int good_interface(const struct dirent *if_entry){
1157
1519
if(if_entry->d_name[0] == '.'){
1158
1520
return 0;
1161
1523
struct ifreq ifr;
1162
1524
if(not get_flags(if_entry->d_name, &ifr)){
1163
1525
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1528
}
1529
return 0;
1530
}
1531
1532
if(not good_flags(if_entry->d_name, &ifr)){
1533
return 0;
1534
}
1535
return 1;
1536
}
1537
1538
/*
1539
* This function determines if a network interface is up.
1540
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1543
struct ifreq ifr;
1544
if(not get_flags(interface, &ifr)){
1545
if(debug){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1548
}
1549
return false;
1550
}
1551
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1553
}
1554
1555
/*
1556
* This function determines if a network interface is running
1557
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1560
struct ifreq ifr;
1561
if(not get_flags(interface, &ifr)){
1562
if(debug){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1565
}
1566
return false;
1567
}
1568
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
}
1571
1572
__attribute__((nonnull, pure, warn_unused_result))
1219
1573
int notdotentries(const struct dirent *direntry){
1220
1574
/* Skip "." and ".." */
1221
1575
if(direntry->d_name[0] == '.'
1228
1582
}
1229
1583
1230
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1231
1586
int runnable_hook(const struct dirent *direntry){
1232
1587
int ret;
1233
1588
size_t sret;
1241
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1242
1597
"abcdefghijklmnopqrstuvwxyz"
1243
1598
"0123456789"
1244
"_-");
1599
"_.-");
1245
1600
if((direntry->d_name)[sret] != '\0'){
1246
1601
/* Contains non-allowed characters */
1247
1602
if(debug){
1248
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1604
direntry->d_name);
1250
1605
}
1251
1606
return 0;
1252
1607
}
1253
1608
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1262
1610
if(ret == -1){
1263
1611
if(debug){
1264
1612
perror_plus("Could not stat hook");
1269
1617
/* Not a regular file */
1270
1618
if(debug){
1271
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1620
direntry->d_name);
1273
1621
}
1274
1622
return 0;
1275
1623
}
1277
1625
/* Not executable */
1278
1626
if(debug){
1279
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1628
direntry->d_name);
1281
1629
}
1282
1630
return 0;
1283
1631
}
1632
if(debug){
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1634
direntry->d_name);
1635
}
1284
1636
return 1;
1285
1637
}
1286
1638
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1288
1642
int ret;
1289
1643
struct timespec now;
1290
1644
struct timespec waited_time;
1291
1645
intmax_t block_time;
1292
1646
1293
1647
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1648
if(mc->current_server == NULL){
1649
if(debug){
1650
fprintf_plus(stderr, "Wait until first server is found."
1651
" No timeout!\n");
1297
1652
}
1298
1653
ret = avahi_simple_poll_iterate(s, -1);
1299
1654
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1655
if(debug){
1656
fprintf_plus(stderr, "Check current_server if we should run"
1657
" it, or wait\n");
1303
1658
}
1304
1659
/* the current time */
1305
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1310
1665
/* Calculating in ms how long time between now and server
1311
1666
who we visted longest time ago. Now - last seen. */
1312
1667
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1668
- mc->current_server->last_seen.tv_sec);
1314
1669
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1670
- mc->current_server->last_seen.tv_nsec);
1316
1671
/* total time is 10s/10,000ms.
1317
1672
Converting to s from ms by dividing by 1,000,
1318
1673
and ns to ms by dividing by 1,000,000. */
1320
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1321
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1677
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1678
if(debug){
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
block_time);
1325
1681
}
1326
1682
1327
1683
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1332
1688
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1689
avahi_simple_poll_quit(s);
1334
1690
return 0;
1335
1691
}
1336
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1693
&mc->current_server->last_seen);
1338
1694
if(ret == -1){
1339
1695
perror_plus("clock_gettime");
1340
1696
return -1;
1341
1697
}
1342
mc.current_server = mc.current_server->next;
1698
mc->current_server = mc->current_server->next;
1343
1699
block_time = 0; /* Call avahi to find new Mandos
1344
1700
servers, but don't block */
1345
1701
}
1347
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
1704
}
1349
1705
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
1706
if(ret > 0 or errno != EINTR){
1351
1707
return (ret != 1) ? ret : 0;
1352
1708
}
1353
1709
}
1354
1710
}
1355
1711
}
1356
1712
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1715
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1760
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1807
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1812
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1881
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1901
}
1902
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
1907
int ret;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1910
if(if_index == 0){
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1912
errno = old_errno;
1913
return ENXIO;
1914
}
1915
1916
if(quit_now){
1917
errno = old_errno;
1918
return EINTR;
1919
}
1920
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1924
ret_errno = errno;
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
return ret_errno;
1929
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1931
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1934
ret_errno = errno;
1935
perror_plus("socket");
1936
errno = old_errno;
1937
return ret_errno;
1938
}
1939
1940
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1945
errno = old_errno;
1946
return EINTR;
1947
}
1948
1949
if(debug){
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1951
interface);
1952
}
1953
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1960
1961
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1973
}
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
#ifdef __linux__
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
}
1983
}
1984
#endif /* __linux__ */
1985
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1995
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1998
if(ret == -1){
1999
perror_plus("close");
2000
}
2001
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
errno = old_errno;
2006
return ioctl_errno;
2007
}
2008
} else if(debug){
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2010
interface);
2011
}
2012
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2017
break;
2018
}
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2023
}
2024
}
2025
2026
errno = old_errno;
2027
return 0;
2028
}
2029
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2035
if(if_index == 0){
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2037
errno = old_errno;
2038
return ENXIO;
2039
}
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(debug){
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2061
interface);
2062
}
2063
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
2083
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
if(ret == -1){
2087
perror_plus("close");
2088
}
2089
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
errno = old_errno;
2094
return ioctl_errno;
2095
}
2096
} else if(debug){
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2098
interface);
2099
}
2100
2101
errno = old_errno;
2102
return 0;
2103
}
2104
1357
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
1358
2110
AvahiSServiceBrowser *sb = NULL;
1359
int error;
2111
error_t ret_errno;
1360
2112
int ret;
1361
2113
intmax_t tmpmax;
1362
2114
char *tmp;
1363
2115
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1372
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
2122
const char *seckey = PATHDIR "/" SECKEY;
1374
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
1375
2125
1376
2126
bool gnutls_initialized = false;
1377
2127
bool gpgme_initialized = false;
1439
2189
.group = 2 },
1440
2190
{ .name = "retry", .key = 132,
1441
2191
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
2192
.doc = "Retry interval used when denied by the Mandos server",
1443
2193
.group = 2 },
1444
2194
{ .name = "network-hook-dir", .key = 133,
1445
2195
.arg = "DIR",
1468
2218
connect_to = arg;
1469
2219
break;
1470
2220
case 'i': /* --interface */
1471
interface = arg;
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2222
arg, (int)',');
2223
if(ret_errno != 0){
2224
argp_error(state, "%s", strerror(ret_errno));
2225
}
1472
2226
break;
1473
2227
case 's': /* --seckey */
1474
2228
seckey = arg;
1517
2271
argp_state_help(state, state->out_stream,
1518
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
2273
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
2275
exit(argp_err_exit_status);
1523
2276
break;
1547
2300
goto end;
1548
2301
}
1549
2302
}
1550
2303
1551
2304
{
1552
2305
/* Work around Debian bug #633582:
1553
2306
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
2307
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
1619
2313
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
2314
struct stat st;
2315
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2320
} else {
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2322
if(ret == -1){
2323
perror_plus("fstat");
2324
} else {
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2328
if(ret == -1){
2329
perror_plus("fchown");
2330
}
2331
}
2332
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
}
2335
}
2336
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2341
} else {
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2343
if(ret == -1){
2344
perror_plus("fstat");
2345
} else {
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2349
if(ret == -1){
2350
perror_plus("fchown");
2351
}
2352
}
2353
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2364
}
2365
}
2366
2367
/* Remove invalid interface names (except "none") */
2368
{
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2371
interface))){
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2377
}
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2379
interface = NULL;
2380
}
2381
}
2382
}
2383
2384
/* Run network hooks */
2385
{
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
2390
goto end;
2391
}
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2394
}
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
1705
2397
}
1706
2398
1707
2399
if(not debug){
1708
2400
avahi_set_log_function(empty_log);
1709
2401
}
1710
2402
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1743
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
2404
from the signal handler */
1745
2405
/* Initialize the pseudo-RNG for Avahi */
1746
2406
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
1750
2411
exitcode = EX_UNAVAILABLE;
1751
2412
goto end;
1752
2413
}
1814
2475
}
1815
2476
}
1816
2477
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2483
alphasort);
2484
if(ret >= 1){
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2489
if(ret_errno != 0){
2490
errno = ret_errno;
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2493
continue;
2494
}
2495
if(debug){
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2498
}
2499
free(direntries[i]);
2500
}
2501
free(direntries);
2502
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2508
goto end;
2509
}
2510
}
2511
2512
/* Bring up interfaces which are down, and remove any "none"s */
2513
{
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2516
interface))){
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2521
interface);
2522
interface = NULL;
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2527
interface);
2528
interface = NULL;
1902
2529
}
1903
2530
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
2531
break;
1922
2532
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2536
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2538
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2545
}
2546
}
2547
}
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2550
}
2551
}
2552
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2555
if(debug){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2557
mc.interfaces);
2558
}
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1960
2560
}
1961
2561
1962
2562
if(quit_now){
1963
2563
goto end;
1964
2564
}
1965
2565
1966
ret = init_gnutls_global(pubkey, seckey);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
1967
2567
if(ret == -1){
1968
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
2569
exitcode = EX_UNAVAILABLE;
1976
2576
goto end;
1977
2577
}
1978
2578
1979
if(mkdtemp(tempdir) == NULL){
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
1980
2589
perror_plus("mkdtemp");
1981
2590
goto end;
1982
2591
}
1983
tempdir_created = true;
1984
2592
1985
2593
if(quit_now){
1986
2594
goto end;
1987
2595
}
1988
2596
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1990
2598
fprintf_plus(stderr, "init_gpgme failed\n");
1991
2599
exitcode = EX_UNAVAILABLE;
1992
2600
goto end;
2002
2610
/* Connect directly, do not use Zeroconf */
2003
2611
/* (Mainly meant for debugging) */
2004
2612
char *address = strrchr(connect_to, ':');
2613
2005
2614
if(address == NULL){
2006
2615
fprintf_plus(stderr, "No colon in address\n");
2007
2616
exitcode = EX_USAGE;
2012
2621
goto end;
2013
2622
}
2014
2623
2015
uint16_t port;
2624
in_port_t port;
2016
2625
errno = 0;
2017
2626
tmpmax = strtoimax(address+1, &tmp, 10);
2018
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
2628
or tmpmax != (in_port_t)tmpmax){
2020
2629
fprintf_plus(stderr, "Bad port number\n");
2021
2630
exitcode = EX_USAGE;
2022
2631
goto end;
2023
2632
}
2024
2633
2025
2634
if(quit_now){
2026
2635
goto end;
2027
2636
}
2028
2637
2029
port = (uint16_t)tmpmax;
2638
port = (in_port_t)tmpmax;
2030
2639
*address = '\0';
2031
2640
/* Colon in address indicates IPv6 */
2032
2641
int af;
2048
2657
}
2049
2658
2050
2659
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2660
ret = start_mandos_communication(address, port, if_index, af,
2661
&mc);
2052
2662
if(quit_now or ret == 0){
2053
2663
break;
2054
2664
}
2055
2665
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
2057
2668
}
2058
sleep((int)retry_interval);
2669
sleep((unsigned int)retry_interval);
2059
2670
}
2060
2671
2061
if (not quit_now){
2672
if(not quit_now){
2062
2673
exitcode = EXIT_SUCCESS;
2063
2674
}
2064
2675
2079
2690
config.publish_domain = 0;
2080
2691
2081
2692
/* Allocate a new server */
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
2085
2695
2086
2696
/* Free the Avahi configuration data */
2087
2697
avahi_server_config_free(&config);
2090
2700
/* Check if creating the Avahi server object succeeded */
2091
2701
if(mc.server == NULL){
2092
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2093
avahi_strerror(error));
2703
avahi_strerror(ret_errno));
2094
2704
exitcode = EX_UNAVAILABLE;
2095
2705
goto end;
2096
2706
}
2102
2712
/* Create the Avahi service browser */
2103
2713
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
2715
NULL, 0, browse_callback,
2716
(void *)&mc);
2106
2717
if(sb == NULL){
2107
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2108
avahi_strerror(avahi_server_errno(mc.server)));
2719
avahi_strerror(avahi_server_errno(mc.server)));
2109
2720
exitcode = EX_UNAVAILABLE;
2110
2721
goto end;
2111
2722
}
2119
2730
if(debug){
2120
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
2732
}
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2733
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
2125
2736
if(debug){
2126
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2738
(ret == 0) ? "successfully" : "with error");
2128
2739
}
2129
2740
2130
2741
end:
2134
2745
}
2135
2746
2136
2747
/* Cleanup things */
2748
free(mc.interfaces);
2749
2137
2750
if(sb != NULL)
2138
2751
avahi_s_service_browser_free(sb);
2139
2752
2140
2753
if(mc.server != NULL)
2141
2754
avahi_server_free(mc.server);
2142
2755
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
2145
2758
2146
2759
if(gnutls_initialized){
2147
2760
gnutls_certificate_free_credentials(mc.cred);
2152
2765
if(gpgme_initialized){
2153
2766
gpgme_release(mc.ctx);
2154
2767
}
2155
2768
2156
2769
/* Cleans up the circular linked list of Mandos servers the client
2157
2770
has seen */
2158
2771
if(mc.current_server != NULL){
2159
2772
mc.current_server->prev->next = NULL;
2160
2773
while(mc.current_server != NULL){
2161
2774
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
2162
2783
free(mc.current_server);
2163
2784
mc.current_server = next;
2164
2785
}
2165
2786
}
2166
2787
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2788
/* Re-raise privileges */
2789
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
2176
2817
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2198
2823
}
2199
2824
}
2200
2825
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2828
2201
2829
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
2830
if(tempdir != NULL){
2203
2831
struct dirent **direntries = NULL;
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
2208
for(int i = 0; i < numentries; i++){
2209
direntry = direntries[i];
2210
char *fullname = NULL;
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
direntry->d_name);
2213
if(ret < 0){
2214
perror_plus("asprintf");
2215
continue;
2216
}
2217
ret = remove(fullname);
2218
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2220
}
2221
free(fullname);
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2222
2871
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
2229
}
2230
ret = rmdir(tempdir);
2231
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2233
2873
}
2234
2874
}
2235
2875
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0