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- Committer: Björn Påhlsson
- Date: 2011-12-21 00:33:12 UTC
- mfrom: (505.2.13 mandos-client-network-hooks)
- Revision ID: belorn@recompile.se-20111221003312-jwn6d76u2c2lejoz
working new feature: network-hooks - Enables user-scripts to take up
interfaces during bootup
interfaces during bootup
- files removed:
- bugs.xml
- debian/upstream
- 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 © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
95
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
89
WEXITSTATUS(), WTERMSIG() */
97
90
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
91
105
92
#ifdef __linux__
106
93
#include <sys/klog.h> /* klogctl() */
148
135
static const char sys_class_net[] = "/sys/class/net";
149
136
char *connect_to = NULL;
150
137
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
138
155
139
/* Doubly linked list that need to be circularly linked when used */
156
140
typedef struct server{
157
141
const char *ip;
158
in_port_t port;
142
uint16_t port;
159
143
AvahiIfIndex if_index;
160
144
int af;
161
145
struct timespec last_seen;
165
149
166
150
/* Used for passing in values through the Avahi callback functions */
167
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
168
153
AvahiServer *server;
169
154
gnutls_certificate_credentials_t cred;
170
155
unsigned int dh_bits;
172
157
const char *priority;
173
158
gpgme_ctx_t ctx;
174
159
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
160
} mandos_context;
178
161
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
181
167
182
168
sig_atomic_t quit_now = 0;
183
169
int signal_received = 0;
184
170
185
171
/* Function to use when printing errors */
186
172
void perror_plus(const char *print_text){
187
int e = errno;
188
173
fprintf(stderr, "Mandos plugin %s: ",
189
174
program_invocation_short_name);
190
errno = e;
191
175
perror(print_text);
192
176
}
193
177
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
178
int fprintf_plus(FILE *stream, const char *format, ...){
196
179
va_list ap;
197
180
va_start (ap, format);
198
181
199
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
183
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
185
}
203
186
204
187
/*
206
189
* bytes. "buffer_capacity" is how much is currently allocated,
207
190
* "buffer_length" is how much is already used.
208
191
*/
209
__attribute__((nonnull, warn_unused_result))
210
192
size_t incbuffer(char **buffer, size_t buffer_length,
211
193
size_t buffer_capacity){
212
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
219
197
return 0;
220
198
}
221
*buffer = new_buf;
222
199
buffer_capacity += BUFFER_SIZE;
223
200
}
224
201
return buffer_capacity;
225
202
}
226
203
227
204
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
231
207
int ret;
232
208
server *new_server = malloc(sizeof(server));
233
209
if(new_server == NULL){
234
210
perror_plus("malloc");
235
return false;
211
return -1;
236
212
}
237
213
*new_server = (server){ .ip = strdup(ip),
238
214
.port = port,
240
216
.af = af };
241
217
if(new_server->ip == NULL){
242
218
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
219
return -1;
259
220
}
260
221
/* Special case of first server */
261
if(*current_server == NULL){
222
if (mc.current_server == NULL){
262
223
new_server->next = new_server;
263
224
new_server->prev = new_server;
264
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
265
227
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
269
230
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
273
239
}
274
240
275
241
/*
276
242
* Initialize GPGME.
277
243
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
283
246
gpgme_error_t rc;
284
247
gpgme_engine_info_t engine_info;
285
248
249
286
250
/*
287
251
* Helper function to insert pub and seckey to the engine keyring.
288
252
*/
289
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
290
254
int ret;
291
255
int fd;
292
256
gpgme_data_t pgp_data;
304
268
return false;
305
269
}
306
270
307
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
308
272
if(rc != GPG_ERR_NO_ERROR){
309
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
274
gpgme_strsource(rc), gpgme_strerror(rc));
311
275
return false;
312
276
}
313
277
314
ret = close(fd);
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
279
if(ret == -1){
316
280
perror_plus("close");
317
281
}
354
318
}
355
319
356
320
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
358
322
if(rc != GPG_ERR_NO_ERROR){
359
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
373
337
* Decrypt OpenPGP data.
374
338
* Returns -1 on error
375
339
*/
376
__attribute__((nonnull, warn_unused_result))
377
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
341
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
342
char **plaintext){
381
343
gpgme_data_t dh_crypto, dh_plain;
382
344
gpgme_error_t rc;
383
345
ssize_t ret;
409
371
410
372
/* Decrypt data from the cryptotext data buffer to the plaintext
411
373
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
375
if(rc != GPG_ERR_NO_ERROR){
414
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
377
gpgme_strsource(rc), gpgme_strerror(rc));
416
378
plaintext_length = -1;
417
379
if(debug){
418
380
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
420
382
if(result == NULL){
421
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
384
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
427
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
388
result->wrong_key_usage);
429
389
if(result->file_name != NULL){
501
461
return plaintext_length;
502
462
}
503
463
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
513
const char *ret = gnutls_strerror(value);
514
return safe_string(ret);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
return ret;
515
470
}
516
471
517
472
/* GnuTLS log function callback */
518
__attribute__((nonnull))
519
473
static void debuggnutls(__attribute__((unused)) int level,
520
474
const char* string){
521
475
fprintf_plus(stderr, "GnuTLS: %s", string);
522
476
}
523
477
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
525
478
static int init_gnutls_global(const char *pubkeyfilename,
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
479
const char *seckeyfilename){
529
480
int ret;
530
unsigned int uret;
531
481
532
482
if(debug){
533
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
534
484
}
535
485
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
490
return -1;
491
}
492
536
493
if(debug){
537
494
/* "Use a log level over 10 to enable all debugging options."
538
495
* - GnuTLS manual
542
499
}
543
500
544
501
/* OpenPGP credentials */
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
546
503
if(ret != GNUTLS_E_SUCCESS){
547
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
505
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
549
507
return -1;
550
508
}
551
509
557
515
}
558
516
559
517
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
561
519
GNUTLS_OPENPGP_FMT_BASE64);
562
520
if(ret != GNUTLS_E_SUCCESS){
563
521
fprintf_plus(stderr,
569
527
}
570
528
571
529
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
573
531
if(ret != GNUTLS_E_SUCCESS){
574
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
533
" initialization: %s\n",
576
534
safer_gnutls_strerror(ret));
577
535
goto globalfail;
578
536
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
757
545
758
546
return 0;
759
547
760
548
globalfail:
761
549
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
764
553
return -1;
765
554
}
766
555
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
769
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
770
557
int ret;
771
558
/* GnuTLS session creation */
772
559
do {
784
571
{
785
572
const char *err;
786
573
do {
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
788
575
if(quit_now){
789
576
gnutls_deinit(*session);
790
577
return -1;
801
588
802
589
do {
803
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
804
mc->cred);
591
mc.cred);
805
592
if(quit_now){
806
593
gnutls_deinit(*session);
807
594
return -1;
817
604
/* ignore client certificate if any. */
818
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
819
606
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
820
609
return 0;
821
610
}
822
611
824
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
825
614
__attribute__((unused)) const char *txt){}
826
615
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
1045
616
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
1048
618
AvahiIfIndex if_index,
1049
int af, mandos_context *mc){
619
int af){
1050
620
int ret, tcp_sd = -1;
1051
621
ssize_t sret;
1052
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
1053
626
char *buffer = NULL;
1054
627
char *decrypted_buffer = NULL;
1055
628
size_t buffer_length = 0;
1058
631
int retval = -1;
1059
632
gnutls_session_t session;
1060
633
int pf; /* Protocol family */
1061
bool route_added = false;
1062
634
1063
635
errno = 0;
1064
636
1080
652
return -1;
1081
653
}
1082
654
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1086
bool match = false;
1087
{
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
match = true;
1094
break;
1095
}
1096
}
1097
}
1098
if(not match){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1101
if(debug){
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1105
} else {
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1107
" \"%s\"\n",
1108
if_indextoname((unsigned int)if_index,
1109
interface));
1110
}
1111
}
1112
return -1;
1113
}
1114
}
1115
1116
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
1117
656
if(ret != 0){
1118
657
return -1;
1119
658
}
1120
659
1121
660
if(debug){
1122
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
1124
663
}
1125
664
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1127
666
if(tcp_sd < 0){
1128
667
int e = errno;
1129
668
perror_plus("socket");
1136
675
goto mandos_end;
1137
676
}
1138
677
678
memset(&to, 0, sizeof(to));
1139
679
if(af == AF_INET6){
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1143
682
} else { /* IPv4 */
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
1147
685
}
1148
686
if(ret < 0 ){
1149
687
int e = errno;
1158
696
goto mandos_end;
1159
697
}
1160
698
if(af == AF_INET6){
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1164
706
if(if_index == AVAHI_IF_UNSPEC){
1165
707
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
708
" incomplete without a network interface\n");
1168
710
goto mandos_end;
1169
711
}
1170
712
/* Set the network interface number as scope */
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1172
714
}
1173
715
} else {
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1175
719
}
1176
720
1177
721
if(quit_now){
1185
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1186
730
perror_plus("if_indextoname");
1187
731
} else {
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1190
734
}
1191
735
} else {
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1194
738
}
1195
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1196
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
1277
780
}
1278
781
1279
782
const char *out = mandos_protocol_version;
1315
818
goto mandos_end;
1316
819
}
1317
820
1318
/* This casting via intptr_t is to eliminate warning about casting
1319
an int to a pointer type. This is exactly how the GnuTLS Guile
1320
function "set-session-transport-fd!" does it. */
1321
gnutls_transport_set_ptr(session,
1322
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1323
823
1324
824
if(quit_now){
1325
825
errno = EINTR;
1430
930
if(buffer_length > 0){
1431
931
ssize_t decrypted_buffer_size;
1432
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
933
&decrypted_buffer);
1434
934
if(decrypted_buffer_size >= 0){
1435
935
1436
clearerr(stdout);
1437
936
written = 0;
1438
937
while(written < (size_t) decrypted_buffer_size){
1439
938
if(quit_now){
1455
954
}
1456
955
written += (size_t)ret;
1457
956
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
957
retval = 0;
1469
958
}
1470
959
}
1473
962
1474
963
mandos_end:
1475
964
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
1482
965
int e = errno;
1483
966
free(decrypted_buffer);
1484
967
free(buffer);
1485
968
if(tcp_sd >= 0){
1486
ret = close(tcp_sd);
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1487
970
}
1488
971
if(ret == -1){
1489
972
if(e == 0){
1514
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1515
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1516
999
flags,
1517
void *mc){
1518
if(r == NULL){
1519
return;
1520
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1521
1002
1522
1003
/* Called whenever a service has been resolved successfully or
1523
1004
timed out */
1524
1005
1525
1006
if(quit_now){
1526
avahi_s_service_resolver_free(r);
1527
1007
return;
1528
1008
}
1529
1009
1533
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1534
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1535
1015
domain,
1536
avahi_strerror(avahi_server_errno
1537
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1538
1017
break;
1539
1018
1540
1019
case AVAHI_RESOLVER_FOUND:
1546
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1547
1026
host_name, ip, (intmax_t)interface, port);
1548
1027
}
1549
int ret = start_mandos_communication(ip, (in_port_t)port,
1550
interface,
1551
avahi_proto_to_af(proto),
1552
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1553
1030
if(ret == 0){
1554
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1555
1032
} else {
1556
if(not add_server(ip, (in_port_t)port, interface,
1557
avahi_proto_to_af(proto),
1558
&((mandos_context*)mc)->current_server)){
1559
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1560
" list\n", name);
1561
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1562
1035
}
1563
1036
}
1564
1037
}
1574
1047
const char *domain,
1575
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1576
1049
flags,
1577
void *mc){
1578
if(b == NULL){
1579
return;
1580
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1581
1052
1582
1053
/* Called whenever a new services becomes available on the LAN or
1583
1054
is removed from the LAN */
1591
1062
case AVAHI_BROWSER_FAILURE:
1592
1063
1593
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1596
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1597
1067
return;
1598
1068
1599
1069
case AVAHI_BROWSER_NEW:
1602
1072
the callback function is called the Avahi server will free the
1603
1073
resolver for us. */
1604
1074
1605
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1606
interface, protocol, name, type,
1607
domain, protocol, 0,
1608
resolve_callback, mc) == NULL)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1609
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1610
1079
" %s\n", name,
1611
avahi_strerror(avahi_server_errno
1612
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1613
1081
break;
1614
1082
1615
1083
case AVAHI_BROWSER_REMOVE:
1634
1102
signal_received = sig;
1635
1103
int old_errno = errno;
1636
1104
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1639
1107
}
1640
1108
errno = old_errno;
1641
1109
}
1642
1110
1643
__attribute__((nonnull, warn_unused_result))
1644
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
1112
int ret;
1646
int old_errno;
1647
1113
1648
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
1115
if(s < 0){
1650
old_errno = errno;
1651
1116
perror_plus("socket");
1652
errno = old_errno;
1653
1117
return false;
1654
1118
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1119
strcpy(ifr->ifr_name, ifname);
1657
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
1121
if(ret == -1){
1659
1122
if(debug){
1660
old_errno = errno;
1661
1123
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1668
1124
}
1669
1125
return false;
1670
1126
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
1127
return true;
1677
1128
}
1678
1129
1679
__attribute__((nonnull, warn_unused_result))
1680
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1681
1131
1682
1132
/* Reject the loopback device */
1724
1174
* corresponds to an acceptable network device.
1725
1175
* (This function is passed to scandir(3) as a filter function.)
1726
1176
*/
1727
__attribute__((nonnull, warn_unused_result))
1728
1177
int good_interface(const struct dirent *if_entry){
1729
1178
if(if_entry->d_name[0] == '.'){
1730
1179
return 0;
1746
1195
}
1747
1196
1748
1197
/*
1749
* This function determines if a network interface is up.
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1763
}
1764
1765
/*
1766
* This function determines if a network interface is running
1767
*/
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1770
struct ifreq ifr;
1771
if(not get_flags(interface, &ifr)){
1772
if(debug){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1775
}
1776
return false;
1777
}
1778
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
}
1781
1782
__attribute__((nonnull, pure, warn_unused_result))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1783
1240
int notdotentries(const struct dirent *direntry){
1784
1241
/* Skip "." and ".." */
1785
1242
if(direntry->d_name[0] == '.'
1792
1249
}
1793
1250
1794
1251
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
1252
int runnable_hook(const struct dirent *direntry){
1797
1253
int ret;
1798
1254
size_t sret;
1806
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
1263
"abcdefghijklmnopqrstuvwxyz"
1808
1264
"0123456789"
1809
"_.-");
1265
"_-");
1810
1266
if((direntry->d_name)[sret] != '\0'){
1811
1267
/* Contains non-allowed characters */
1812
1268
if(debug){
1816
1272
return 0;
1817
1273
}
1818
1274
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1820
1283
if(ret == -1){
1821
1284
if(debug){
1822
1285
perror_plus("Could not stat hook");
1846
1309
return 1;
1847
1310
}
1848
1311
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1852
1313
int ret;
1853
1314
struct timespec now;
1854
1315
struct timespec waited_time;
1855
1316
intmax_t block_time;
1856
1317
1857
1318
while(true){
1858
if(mc->current_server == NULL){
1859
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1860
1321
fprintf_plus(stderr, "Wait until first server is found."
1861
1322
" No timeout!\n");
1862
1323
}
1863
1324
ret = avahi_simple_poll_iterate(s, -1);
1864
1325
} else {
1865
if(debug){
1326
if (debug){
1866
1327
fprintf_plus(stderr, "Check current_server if we should run"
1867
1328
" it, or wait\n");
1868
1329
}
1875
1336
/* Calculating in ms how long time between now and server
1876
1337
who we visted longest time ago. Now - last seen. */
1877
1338
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1879
1340
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1881
1342
/* total time is 10s/10,000ms.
1882
1343
Converting to s from ms by dividing by 1,000,
1883
1344
and ns to ms by dividing by 1,000,000. */
1885
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1886
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1887
1348
1888
if(debug){
1349
if (debug){
1889
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1890
1351
block_time);
1891
1352
}
1892
1353
1893
1354
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1898
1359
if(ret == 0){
1899
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1900
1361
return 0;
1901
1362
}
1902
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1904
1365
if(ret == -1){
1905
1366
perror_plus("clock_gettime");
1906
1367
return -1;
1907
1368
}
1908
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1909
1370
block_time = 0; /* Call avahi to find new Mandos
1910
1371
servers, but don't block */
1911
1372
}
1913
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1914
1375
}
1915
1376
if(ret != 0){
1916
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1917
1378
return (ret != 1) ? ret : 0;
1918
1379
}
1919
1380
}
1920
1381
}
1921
1382
}
1922
1383
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1925
1385
const float delay){
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1949
1391
if(numhooks == -1){
1950
1392
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1954
struct dirent *direntry;
1955
int ret;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1961
}
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
2008
1400
perror_plus("asprintf");
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
2013
1469
free(delaystring);
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
2082
} else {
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
2102
}
2103
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2111
if(if_index == 0){
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2113
errno = old_errno;
2114
return ENXIO;
2115
}
2116
2117
if(quit_now){
2118
errno = old_errno;
2119
return EINTR;
2120
}
2121
2122
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2126
ret_errno = errno;
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2129
errno = old_errno;
2130
return ret_errno;
2131
}
2132
network.ifr_flags |= IFF_UP; /* set flag */
2133
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
2136
ret_errno = errno;
2137
perror_plus("socket");
2138
errno = old_errno;
2139
return ret_errno;
2140
}
2141
2142
if(quit_now){
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
2147
errno = old_errno;
2148
return EINTR;
2149
}
2150
2151
if(debug){
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2153
interface);
2154
}
2155
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
2162
2163
#ifdef __linux__
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
2175
}
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2179
#ifdef __linux__
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2184
}
2185
}
2186
#endif /* __linux__ */
2187
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
2197
2198
/* Close the socket */
2199
ret = close(sd);
2200
if(ret == -1){
2201
perror_plus("close");
2202
}
2203
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2207
errno = old_errno;
2208
return ioctl_errno;
2209
}
2210
} else if(debug){
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
interface);
2213
}
2214
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
2219
break;
2220
}
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2225
}
2226
}
2227
2228
errno = old_errno;
2229
return 0;
2230
}
2231
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2237
if(if_index == 0){
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2239
errno = old_errno;
2240
return ENXIO;
2241
}
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(debug){
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2264
interface);
2265
}
2266
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
2286
2287
/* Close the socket */
2288
int ret = close(sd);
2289
if(ret == -1){
2290
perror_plus("close");
2291
}
2292
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2296
errno = old_errno;
2297
return ioctl_errno;
2298
}
2299
} else if(debug){
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2301
interface);
2302
}
2303
2304
errno = old_errno;
2305
return 0;
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
2306
1509
}
2307
1510
2308
1511
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2314
1512
AvahiSServiceBrowser *sb = NULL;
2315
error_t ret_errno;
1513
int error;
2316
1514
int ret;
2317
1515
intmax_t tmpmax;
2318
1516
char *tmp;
2319
1517
int exitcode = EXIT_SUCCESS;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
2325
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
1527
const char *seckey = PATHDIR "/" SECKEY;
2327
1528
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
2330
1529
2331
1530
bool gnutls_initialized = false;
2332
1531
bool gpgme_initialized = false;
2384
1583
.doc = "Bit length of the prime number used in the"
2385
1584
" Diffie-Hellman key exchange",
2386
1585
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
2392
1586
{ .name = "priority", .key = 130,
2393
1587
.arg = "STRING",
2394
1588
.doc = "GnuTLS priority string for the TLS handshake",
2399
1593
.group = 2 },
2400
1594
{ .name = "retry", .key = 132,
2401
1595
.arg = "SECONDS",
2402
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
2403
1597
.group = 2 },
2404
1598
{ .name = "network-hook-dir", .key = 133,
2405
1599
.arg = "DIR",
2428
1622
connect_to = arg;
2429
1623
break;
2430
1624
case 'i': /* --interface */
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2432
arg, (int)',');
2433
if(ret_errno != 0){
2434
argp_error(state, "%s", strerror(ret_errno));
2435
}
1625
interface = arg;
2436
1626
break;
2437
1627
case 's': /* --seckey */
2438
1628
seckey = arg;
2449
1639
}
2450
1640
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2451
1641
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
2455
1642
case 130: /* --priority */
2456
1643
mc.priority = arg;
2457
1644
break;
2484
1671
argp_state_help(state, state->out_stream,
2485
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2486
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
2487
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2488
1677
exit(argp_err_exit_status);
2489
1678
break;
2497
1686
.args_doc = "",
2498
1687
.doc = "Mandos client -- Get and decrypt"
2499
1688
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1691
switch(ret){
2503
1692
case 0:
2504
1693
break;
2505
1694
case ENOMEM:
2506
1695
default:
2507
errno = ret_errno;
1696
errno = ret;
2508
1697
perror_plus("argp_parse");
2509
1698
exitcode = EX_OSERR;
2510
1699
goto end;
2513
1702
goto end;
2514
1703
}
2515
1704
}
2516
1705
2517
1706
{
2518
1707
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
1708
<http://bugs.debian.org/633582> */
2520
1709
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2526
1715
} else {
2527
1716
struct stat st;
2528
1717
2543
1732
}
2544
1733
}
2545
1734
}
2546
close(seckey_fd);
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
2547
1736
}
2548
1737
}
2549
1738
2550
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
1740
int pubkey_fd = open(pubkey, O_RDONLY);
2552
1741
if(pubkey_fd == -1){
2564
1753
}
2565
1754
}
2566
1755
}
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
2593
1760
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2598
}
2599
}
2600
}
2601
2602
/* Remove invalid interface names (except "none") */
2603
{
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2606
interface))){
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2612
}
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2614
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2615
1765
}
2616
1766
}
2617
1767
}
2618
1768
2619
1769
/* Run network hooks */
2620
{
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2625
goto end;
2626
}
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2632
1772
}
2633
1773
2634
1774
if(not debug){
2635
1775
avahi_set_log_function(empty_log);
2636
1776
}
2637
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2638
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2639
1811
from the signal handler */
2640
1812
/* Initialize the pseudo-RNG for Avahi */
2641
1813
srand((unsigned int) time(NULL));
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2644
1816
fprintf_plus(stderr,
2645
1817
"Avahi: Failed to create simple poll object.\n");
2646
1818
exitcode = EX_UNAVAILABLE;
2710
1882
}
2711
1883
}
2712
1884
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2718
alphasort);
2719
if(ret >= 1){
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2728
continue;
2729
}
2730
if(debug){
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2733
}
2734
free(direntries[i]);
2735
}
2736
free(direntries);
2737
} else {
2738
if(ret == 0){
2739
free(direntries);
2740
}
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2742
exitcode = EXIT_FAILURE;
2743
goto end;
2744
}
2745
}
2746
2747
/* Bring up interfaces which are down, and remove any "none"s */
2748
{
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2751
interface))){
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
interface);
2757
interface = NULL;
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2762
interface);
2763
interface = NULL;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2764
1970
}
2765
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2766
1989
break;
2767
1990
}
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2774
} else {
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2781
}
2782
}
2783
}
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2786
}
2787
}
2788
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2791
if(debug){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
mc.interfaces);
2794
}
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2796
2020
}
2797
2021
2798
2022
if(quit_now){
2799
2023
goto end;
2800
2024
}
2801
2025
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2803
2027
if(ret == -1){
2804
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
2029
exitcode = EX_UNAVAILABLE;
2812
2036
goto end;
2813
2037
}
2814
2038
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2039
if(mkdtemp(tempdir) == NULL){
2825
2040
perror_plus("mkdtemp");
2826
2041
goto end;
2827
2042
}
2043
tempdir_created = true;
2828
2044
2829
2045
if(quit_now){
2830
2046
goto end;
2831
2047
}
2832
2048
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2834
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2835
2051
exitcode = EX_UNAVAILABLE;
2836
2052
goto end;
2846
2062
/* Connect directly, do not use Zeroconf */
2847
2063
/* (Mainly meant for debugging) */
2848
2064
char *address = strrchr(connect_to, ':');
2849
2850
2065
if(address == NULL){
2851
2066
fprintf_plus(stderr, "No colon in address\n");
2852
2067
exitcode = EX_USAGE;
2857
2072
goto end;
2858
2073
}
2859
2074
2860
in_port_t port;
2075
uint16_t port;
2861
2076
errno = 0;
2862
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2863
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2864
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2865
2080
fprintf_plus(stderr, "Bad port number\n");
2866
2081
exitcode = EX_USAGE;
2867
2082
goto end;
2868
2083
}
2869
2084
2870
2085
if(quit_now){
2871
2086
goto end;
2872
2087
}
2873
2088
2874
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2875
2090
*address = '\0';
2876
2091
/* Colon in address indicates IPv6 */
2877
2092
int af;
2893
2108
}
2894
2109
2895
2110
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2898
2112
if(quit_now or ret == 0){
2899
2113
break;
2900
2114
}
2902
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
2117
(int)retry_interval);
2904
2118
}
2905
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2906
2120
}
2907
2121
2908
if(not quit_now){
2122
if (not quit_now){
2909
2123
exitcode = EXIT_SUCCESS;
2910
2124
}
2911
2125
2926
2140
config.publish_domain = 0;
2927
2141
2928
2142
/* Allocate a new server */
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2931
2146
2932
2147
/* Free the Avahi configuration data */
2933
2148
avahi_server_config_free(&config);
2936
2151
/* Check if creating the Avahi server object succeeded */
2937
2152
if(mc.server == NULL){
2938
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2154
avahi_strerror(error));
2940
2155
exitcode = EX_UNAVAILABLE;
2941
2156
goto end;
2942
2157
}
2948
2163
/* Create the Avahi service browser */
2949
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2950
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2953
2167
if(sb == NULL){
2954
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2955
2169
avahi_strerror(avahi_server_errno(mc.server)));
2966
2180
if(debug){
2967
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2968
2182
}
2969
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2972
2186
if(debug){
2973
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2974
2188
(ret == 0) ? "successfully" : "with error");
2977
2191
end:
2978
2192
2979
2193
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2987
2195
}
2988
2196
2989
2197
/* Cleanup things */
2990
free(mc.interfaces);
2991
2992
2198
if(sb != NULL)
2993
2199
avahi_s_service_browser_free(sb);
2994
2200
2995
2201
if(mc.server != NULL)
2996
2202
avahi_server_free(mc.server);
2997
2203
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
3000
2206
3001
2207
if(gnutls_initialized){
3002
2208
gnutls_certificate_free_credentials(mc.cred);
2209
gnutls_global_deinit();
3003
2210
gnutls_dh_params_deinit(mc.dh_params);
3004
2211
}
3005
2212
3013
2220
mc.current_server->prev->next = NULL;
3014
2221
while(mc.current_server != NULL){
3015
2222
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
3024
2223
free(mc.current_server);
3025
2224
mc.current_server = next;
3026
2225
}
3027
2226
}
3028
2227
3029
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
3030
2232
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
3058
2237
}
3059
2238
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
3064
2255
}
3065
2256
}
3066
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
2264
/* Removes the GPGME temp directory and all files inside */
2265
if(tempdir_created){
3072
2266
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
3086
2271
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
direntry->d_name);
2276
if(ret < 0){
2277
perror_plus("asprintf");
2278
continue;
2279
}
2280
ret = remove(fullname);
2281
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2284
}
2285
free(fullname);
2286
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
2293
}
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2297
}
3127
2298
}
3128
2299
3129
2300
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0