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- Committer: Teddy Hogeborn
- Date: 2018-02-22 09:20:19 UTC
- Revision ID: teddy@recompile.se-20180222092019-ehyz79hzti9dnk2g
Client bug fix: Don't use leak sanitizer with leaking libraries
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
- files added:
- 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 © 2008-2011 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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
88
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
96
WEXITSTATUS(), WTERMSIG() */
90
97
#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() */
91
104
92
105
#ifdef __linux__
93
106
#include <sys/klog.h> /* klogctl() */
135
148
static const char sys_class_net[] = "/sys/class/net";
136
149
char *connect_to = NULL;
137
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
138
154
139
155
/* Doubly linked list that need to be circularly linked when used */
140
156
typedef struct server{
141
157
const char *ip;
142
uint16_t port;
158
in_port_t port;
143
159
AvahiIfIndex if_index;
144
160
int af;
145
161
struct timespec last_seen;
149
165
150
166
/* Used for passing in values through the Avahi callback functions */
151
167
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
168
AvahiServer *server;
154
169
gnutls_certificate_credentials_t cred;
155
170
unsigned int dh_bits;
157
172
const char *priority;
158
173
gpgme_ctx_t ctx;
159
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
160
177
} mandos_context;
161
178
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 };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
167
181
168
182
sig_atomic_t quit_now = 0;
169
183
int signal_received = 0;
170
184
171
185
/* Function to use when printing errors */
172
186
void perror_plus(const char *print_text){
187
int e = errno;
173
188
fprintf(stderr, "Mandos plugin %s: ",
174
189
program_invocation_short_name);
190
errno = e;
175
191
perror(print_text);
176
192
}
177
193
178
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
179
195
int fprintf_plus(FILE *stream, const char *format, ...){
180
196
va_list ap;
181
197
va_start (ap, format);
182
198
183
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
200
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
202
}
187
203
188
204
/*
190
206
* bytes. "buffer_capacity" is how much is currently allocated,
191
207
* "buffer_length" is how much is already used.
192
208
*/
209
__attribute__((nonnull, warn_unused_result))
193
210
size_t incbuffer(char **buffer, size_t buffer_length,
194
211
size_t buffer_capacity){
195
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
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;
198
219
return 0;
199
220
}
221
*buffer = new_buf;
200
222
buffer_capacity += BUFFER_SIZE;
201
223
}
202
224
return buffer_capacity;
203
225
}
204
226
205
227
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
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){
208
231
int ret;
209
232
server *new_server = malloc(sizeof(server));
210
233
if(new_server == NULL){
217
240
.af = af };
218
241
if(new_server->ip == NULL){
219
242
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);
220
258
return false;
221
259
}
222
260
/* Special case of first server */
223
if (mc.current_server == NULL){
261
if(*current_server == NULL){
224
262
new_server->next = new_server;
225
263
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
264
*current_server = new_server;
228
265
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
231
269
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
270
(*current_server)->prev = new_server;
238
271
}
239
272
return true;
240
273
}
242
275
/*
243
276
* Initialize GPGME.
244
277
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
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){
247
283
gpgme_error_t rc;
248
284
gpgme_engine_info_t engine_info;
249
285
250
251
286
/*
252
287
* Helper function to insert pub and seckey to the engine keyring.
253
288
*/
254
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
255
290
int ret;
256
291
int fd;
257
292
gpgme_data_t pgp_data;
269
304
return false;
270
305
}
271
306
272
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
273
308
if(rc != GPG_ERR_NO_ERROR){
274
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
310
gpgme_strsource(rc), gpgme_strerror(rc));
276
311
return false;
277
312
}
278
313
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
280
315
if(ret == -1){
281
316
perror_plus("close");
282
317
}
319
354
}
320
355
321
356
/* Create new GPGME "context" */
322
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
323
358
if(rc != GPG_ERR_NO_ERROR){
324
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
373
* Decrypt OpenPGP data.
339
374
* Returns -1 on error
340
375
*/
376
__attribute__((nonnull, warn_unused_result))
341
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
378
size_t crypto_size,
343
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
344
381
gpgme_data_t dh_crypto, dh_plain;
345
382
gpgme_error_t rc;
346
383
ssize_t ret;
372
409
373
410
/* Decrypt data from the cryptotext data buffer to the plaintext
374
411
data buffer */
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
376
413
if(rc != GPG_ERR_NO_ERROR){
377
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
415
gpgme_strsource(rc), gpgme_strerror(rc));
379
416
plaintext_length = -1;
380
417
if(debug){
381
418
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
383
420
if(result == NULL){
384
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
422
} else {
462
499
return plaintext_length;
463
500
}
464
501
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
468
if(ret == NULL)
469
ret = "(unknown)";
470
return ret;
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
471
513
}
472
514
473
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
474
517
static void debuggnutls(__attribute__((unused)) int level,
475
518
const char* string){
476
519
fprintf_plus(stderr, "GnuTLS: %s", string);
477
520
}
478
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
479
523
static int init_gnutls_global(const char *pubkeyfilename,
480
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
481
527
int ret;
528
unsigned int uret;
482
529
483
530
if(debug){
484
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
485
532
}
486
533
487
ret = gnutls_global_init();
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
491
return -1;
492
}
493
494
534
if(debug){
495
535
/* "Use a log level over 10 to enable all debugging options."
496
536
* - GnuTLS manual
500
540
}
501
541
502
542
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
504
544
if(ret != GNUTLS_E_SUCCESS){
505
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
546
safer_gnutls_strerror(ret));
507
gnutls_global_deinit();
508
547
return -1;
509
548
}
510
549
516
555
}
517
556
518
557
ret = gnutls_certificate_set_openpgp_key_file
519
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
520
559
GNUTLS_OPENPGP_FMT_BASE64);
521
560
if(ret != GNUTLS_E_SUCCESS){
522
561
fprintf_plus(stderr,
528
567
}
529
568
530
569
/* GnuTLS server initialization */
531
ret = gnutls_dh_params_init(&mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
532
571
if(ret != GNUTLS_E_SUCCESS){
533
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
573
" initialization: %s\n",
535
574
safer_gnutls_strerror(ret));
536
575
goto globalfail;
537
576
}
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
542
goto globalfail;
543
}
544
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
752
547
753
return 0;
548
754
549
755
globalfail:
550
756
551
gnutls_certificate_free_credentials(mc.cred);
552
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_dh_params_deinit(mc->dh_params);
554
759
return -1;
555
760
}
556
761
557
static int init_gnutls_session(gnutls_session_t *session){
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
764
mandos_context *mc){
558
765
int ret;
559
766
/* GnuTLS session creation */
560
767
do {
572
779
{
573
780
const char *err;
574
781
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
576
783
if(quit_now){
577
784
gnutls_deinit(*session);
578
785
return -1;
589
796
590
797
do {
591
798
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
799
mc->cred);
593
800
if(quit_now){
594
801
gnutls_deinit(*session);
595
802
return -1;
605
812
/* ignore client certificate if any. */
606
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
607
814
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
609
610
815
return 0;
611
816
}
612
817
614
819
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
615
820
__attribute__((unused)) const char *txt){}
616
821
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
617
1040
/* Called when a Mandos server is found */
618
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
619
1043
AvahiIfIndex if_index,
620
int af){
1044
int af, mandos_context *mc){
621
1045
int ret, tcp_sd = -1;
622
1046
ssize_t sret;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
1047
struct sockaddr_storage to;
627
1048
char *buffer = NULL;
628
1049
char *decrypted_buffer = NULL;
629
1050
size_t buffer_length = 0;
632
1053
int retval = -1;
633
1054
gnutls_session_t session;
634
1055
int pf; /* Protocol family */
1056
bool route_added = false;
635
1057
636
1058
errno = 0;
637
1059
653
1075
return -1;
654
1076
}
655
1077
656
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
657
1112
if(ret != 0){
658
1113
return -1;
659
1114
}
660
1115
661
1116
if(debug){
662
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
1118
PRIuMAX "\n", ip, (uintmax_t)port);
664
1119
}
665
1120
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
667
1122
if(tcp_sd < 0){
668
1123
int e = errno;
669
1124
perror_plus("socket");
676
1131
goto mandos_end;
677
1132
}
678
1133
679
memset(&to, 0, sizeof(to));
680
1134
if(af == AF_INET6){
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
683
1138
} else { /* IPv4 */
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
686
1142
}
687
1143
if(ret < 0 ){
688
1144
int e = errno;
697
1153
goto mandos_end;
698
1154
}
699
1155
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
707
1159
if(if_index == AVAHI_IF_UNSPEC){
708
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
709
1161
" incomplete without a network interface\n");
711
1163
goto mandos_end;
712
1164
}
713
1165
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
715
1167
}
716
1168
} else {
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
1170
}
721
1171
722
1172
if(quit_now){
730
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
1181
perror_plus("if_indextoname");
732
1182
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
735
1185
}
736
1186
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
739
1189
}
740
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
752
} else {
753
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
756
}
757
}
758
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
769
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
781
1272
}
782
1273
783
1274
const char *out = mandos_protocol_version;
819
1310
goto mandos_end;
820
1311
}
821
1312
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
1318
825
1319
if(quit_now){
826
1320
errno = EINTR;
931
1425
if(buffer_length > 0){
932
1426
ssize_t decrypted_buffer_size;
933
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
&decrypted_buffer);
1428
&decrypted_buffer, mc);
935
1429
if(decrypted_buffer_size >= 0){
936
1430
1431
clearerr(stdout);
937
1432
written = 0;
938
1433
while(written < (size_t) decrypted_buffer_size){
939
1434
if(quit_now){
955
1450
}
956
1451
written += (size_t)ret;
957
1452
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
958
1463
retval = 0;
959
1464
}
960
1465
}
963
1468
964
1469
mandos_end:
965
1470
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
966
1477
int e = errno;
967
1478
free(decrypted_buffer);
968
1479
free(buffer);
969
1480
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
ret = close(tcp_sd);
971
1482
}
972
1483
if(ret == -1){
973
1484
if(e == 0){
998
1509
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
1510
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
1511
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1512
void *mc){
1513
if(r == NULL){
1514
return;
1515
}
1003
1516
1004
1517
/* Called whenever a service has been resolved successfully or
1005
1518
timed out */
1006
1519
1007
1520
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1008
1522
return;
1009
1523
}
1010
1524
1014
1528
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
1529
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
1530
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
1018
1533
break;
1019
1534
1020
1535
case AVAHI_RESOLVER_FOUND:
1026
1541
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
1542
host_name, ip, (intmax_t)interface, port);
1028
1543
}
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1544
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
interface,
1546
avahi_proto_to_af(proto),
1547
mc);
1031
1548
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1549
avahi_simple_poll_quit(simple_poll);
1033
1550
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1551
if(not add_server(ip, (in_port_t)port, interface,
1552
avahi_proto_to_af(proto),
1553
&((mandos_context*)mc)->current_server)){
1036
1554
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
1555
" list\n", name);
1038
1556
}
1051
1569
const char *domain,
1052
1570
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
1571
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1572
void *mc){
1573
if(b == NULL){
1574
return;
1575
}
1056
1576
1057
1577
/* Called whenever a new services becomes available on the LAN or
1058
1578
is removed from the LAN */
1066
1586
case AVAHI_BROWSER_FAILURE:
1067
1587
1068
1588
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1589
avahi_strerror(avahi_server_errno
1590
(((mandos_context*)mc)->server)));
1591
avahi_simple_poll_quit(simple_poll);
1071
1592
return;
1072
1593
1073
1594
case AVAHI_BROWSER_NEW:
1076
1597
the callback function is called the Avahi server will free the
1077
1598
resolver for us. */
1078
1599
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1600
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1601
interface, protocol, name, type,
1602
domain, protocol, 0,
1603
resolve_callback, mc) == NULL)
1082
1604
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
1605
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1085
1608
break;
1086
1609
1087
1610
case AVAHI_BROWSER_REMOVE:
1106
1629
signal_received = sig;
1107
1630
int old_errno = errno;
1108
1631
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1111
1634
}
1112
1635
errno = old_errno;
1113
1636
}
1114
1637
1638
__attribute__((nonnull, warn_unused_result))
1115
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
1640
int ret;
1641
int old_errno;
1117
1642
1118
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
1644
if(s < 0){
1645
old_errno = errno;
1120
1646
perror_plus("socket");
1647
errno = old_errno;
1121
1648
return false;
1122
1649
}
1123
strcpy(ifr->ifr_name, ifname);
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1124
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
1653
if(ret == -1){
1126
1654
if(debug){
1655
old_errno = errno;
1127
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1128
1658
}
1659
close(s);
1129
1660
return false;
1130
1661
}
1662
close(s);
1131
1663
return true;
1132
1664
}
1133
1665
1666
__attribute__((nonnull, warn_unused_result))
1134
1667
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1668
1136
1669
/* Reject the loopback device */
1178
1711
* corresponds to an acceptable network device.
1179
1712
* (This function is passed to scandir(3) as a filter function.)
1180
1713
*/
1714
__attribute__((nonnull, warn_unused_result))
1181
1715
int good_interface(const struct dirent *if_entry){
1182
1716
if(if_entry->d_name[0] == '.'){
1183
1717
return 0;
1199
1733
}
1200
1734
1201
1735
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1736
* This function determines if a network interface is up.
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_up(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_UP);
1750
}
1751
1752
/*
1753
* This function determines if a network interface is running
1754
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
bool interface_is_running(const char *interface){
1757
struct ifreq ifr;
1758
if(not get_flags(interface, &ifr)){
1759
if(debug){
1760
fprintf_plus(stderr, "Failed to get flags for interface "
1761
"\"%s\"\n", interface);
1762
}
1763
return false;
1764
}
1765
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
}
1768
1769
__attribute__((nonnull, pure, warn_unused_result))
1244
1770
int notdotentries(const struct dirent *direntry){
1245
1771
/* Skip "." and ".." */
1246
1772
if(direntry->d_name[0] == '.'
1253
1779
}
1254
1780
1255
1781
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1256
1783
int runnable_hook(const struct dirent *direntry){
1257
1784
int ret;
1258
1785
size_t sret;
1266
1793
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
1794
"abcdefghijklmnopqrstuvwxyz"
1268
1795
"0123456789"
1269
"_-");
1796
"_.-");
1270
1797
if((direntry->d_name)[sret] != '\0'){
1271
1798
/* Contains non-allowed characters */
1272
1799
if(debug){
1276
1803
return 0;
1277
1804
}
1278
1805
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1287
1807
if(ret == -1){
1288
1808
if(debug){
1289
1809
perror_plus("Could not stat hook");
1313
1833
return 1;
1314
1834
}
1315
1835
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1317
1839
int ret;
1318
1840
struct timespec now;
1319
1841
struct timespec waited_time;
1320
1842
intmax_t block_time;
1321
1843
1322
1844
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1845
if(mc->current_server == NULL){
1846
if(debug){
1325
1847
fprintf_plus(stderr, "Wait until first server is found."
1326
1848
" No timeout!\n");
1327
1849
}
1328
1850
ret = avahi_simple_poll_iterate(s, -1);
1329
1851
} else {
1330
if (debug){
1852
if(debug){
1331
1853
fprintf_plus(stderr, "Check current_server if we should run"
1332
1854
" it, or wait\n");
1333
1855
}
1340
1862
/* Calculating in ms how long time between now and server
1341
1863
who we visted longest time ago. Now - last seen. */
1342
1864
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1865
- mc->current_server->last_seen.tv_sec);
1344
1866
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1867
- mc->current_server->last_seen.tv_nsec);
1346
1868
/* total time is 10s/10,000ms.
1347
1869
Converting to s from ms by dividing by 1,000,
1348
1870
and ns to ms by dividing by 1,000,000. */
1350
1872
- ((intmax_t)waited_time.tv_sec * 1000))
1351
1873
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1874
1353
if (debug){
1875
if(debug){
1354
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
1877
block_time);
1356
1878
}
1357
1879
1358
1880
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
1363
1885
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1886
avahi_simple_poll_quit(s);
1365
1887
return 0;
1366
1888
}
1367
1889
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1890
&mc->current_server->last_seen);
1369
1891
if(ret == -1){
1370
1892
perror_plus("clock_gettime");
1371
1893
return -1;
1372
1894
}
1373
mc.current_server = mc.current_server->next;
1895
mc->current_server = mc->current_server->next;
1374
1896
block_time = 0; /* Call avahi to find new Mandos
1375
1897
servers, but don't block */
1376
1898
}
1378
1900
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
1901
}
1380
1902
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1903
if(ret > 0 or errno != EINTR){
1382
1904
return (ret != 1) ? ret : 0;
1383
1905
}
1384
1906
}
1385
1907
}
1386
1908
}
1387
1909
1388
bool run_network_hooks(const char *mode, const char *interface,
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1389
1912
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1395
1936
if(numhooks == -1){
1396
1937
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1948
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1404
1995
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
1473
2000
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
2069
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
2089
}
2090
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
2096
struct ifreq network;
2097
unsigned int if_index = if_nametoindex(interface);
2098
if(if_index == 0){
2099
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2100
errno = old_errno;
2101
return ENXIO;
2102
}
2103
2104
if(quit_now){
2105
errno = old_errno;
2106
return EINTR;
2107
}
2108
2109
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
2113
ret_errno = errno;
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2115
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
return ret_errno;
2118
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
2120
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
2123
ret_errno = errno;
2124
perror_plus("socket");
2125
errno = old_errno;
2126
return ret_errno;
2127
}
2128
2129
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
2134
errno = old_errno;
2135
return EINTR;
2136
}
2137
2138
if(debug){
2139
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2140
interface);
2141
}
2142
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
2149
2150
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
2162
}
2163
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
2166
#ifdef __linux__
2167
if(restore_loglevel){
2168
ret_linux = klogctl(7, NULL, 0);
2169
if(ret_linux == -1){
2170
perror_plus("klogctl");
2171
}
2172
}
2173
#endif /* __linux__ */
2174
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
2184
2185
/* Close the socket */
2186
ret = close(sd);
2187
if(ret == -1){
2188
perror_plus("close");
2189
}
2190
2191
if(ret_setflags == -1){
2192
errno = ioctl_errno;
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
errno = old_errno;
2195
return ioctl_errno;
2196
}
2197
} else if(debug){
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2199
interface);
2200
}
2201
2202
/* Sleep checking until interface is running.
2203
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2205
if(interface_is_running(interface)){
2206
break;
2207
}
2208
struct timespec sleeptime = { .tv_nsec = 250000000 };
2209
ret = nanosleep(&sleeptime, NULL);
2210
if(ret == -1 and errno != EINTR){
2211
perror_plus("nanosleep");
2212
}
2213
}
2214
2215
errno = old_errno;
2216
return 0;
2217
}
2218
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2222
struct ifreq network;
2223
unsigned int if_index = if_nametoindex(interface);
2224
if(if_index == 0){
2225
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2226
errno = old_errno;
2227
return ENXIO;
2228
}
2229
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
if(not get_flags(interface, &network) and debug){
2233
ret_errno = errno;
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2235
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
return ret_errno;
2238
}
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
2243
ret_errno = errno;
2244
perror_plus("socket");
2245
errno = old_errno;
2246
return ret_errno;
2247
}
2248
2249
if(debug){
2250
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2251
interface);
2252
}
2253
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
2273
2274
/* Close the socket */
2275
int ret = close(sd);
2276
if(ret == -1){
2277
perror_plus("close");
2278
}
2279
2280
if(ret_setflags == -1){
2281
errno = ioctl_errno;
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
errno = old_errno;
2284
return ioctl_errno;
2285
}
2286
} else if(debug){
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
interface);
2289
}
2290
2291
errno = old_errno;
2292
return 0;
1515
2293
}
1516
2294
1517
2295
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
1518
2301
AvahiSServiceBrowser *sb = NULL;
1519
int error;
2302
error_t ret_errno;
1520
2303
int ret;
1521
2304
intmax_t tmpmax;
1522
2305
char *tmp;
1523
2306
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
2307
char *interfaces_to_take_down = NULL;
2308
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1532
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
2313
const char *seckey = PATHDIR "/" SECKEY;
1534
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
1535
2317
1536
2318
bool gnutls_initialized = false;
1537
2319
bool gpgme_initialized = false;
1589
2371
.doc = "Bit length of the prime number used in the"
1590
2372
" Diffie-Hellman key exchange",
1591
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
1592
2379
{ .name = "priority", .key = 130,
1593
2380
.arg = "STRING",
1594
2381
.doc = "GnuTLS priority string for the TLS handshake",
1599
2386
.group = 2 },
1600
2387
{ .name = "retry", .key = 132,
1601
2388
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
2389
.doc = "Retry interval used when denied by the Mandos server",
1603
2390
.group = 2 },
1604
2391
{ .name = "network-hook-dir", .key = 133,
1605
2392
.arg = "DIR",
1628
2415
connect_to = arg;
1629
2416
break;
1630
2417
case 'i': /* --interface */
1631
interface = arg;
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
2420
if(ret_errno != 0){
2421
argp_error(state, "%s", strerror(ret_errno));
2422
}
1632
2423
break;
1633
2424
case 's': /* --seckey */
1634
2425
seckey = arg;
1645
2436
}
1646
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1647
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
1648
2442
case 130: /* --priority */
1649
2443
mc.priority = arg;
1650
2444
break;
1690
2484
.args_doc = "",
1691
2485
.doc = "Mandos client -- Get and decrypt"
1692
2486
" passwords from a Mandos server" };
1693
ret = argp_parse(&argp, argc, argv,
1694
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1695
switch(ret){
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
1696
2490
case 0:
1697
2491
break;
1698
2492
case ENOMEM:
1699
2493
default:
1700
errno = ret;
2494
errno = ret_errno;
1701
2495
perror_plus("argp_parse");
1702
2496
exitcode = EX_OSERR;
1703
2497
goto end;
1706
2500
goto end;
1707
2501
}
1708
2502
}
1709
2503
1710
2504
{
1711
2505
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
2506
<https://bugs.debian.org/633582> */
1713
2507
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
1719
2513
} else {
1720
2514
struct stat st;
1721
2515
1736
2530
}
1737
2531
}
1738
2532
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
2533
close(seckey_fd);
1740
2534
}
1741
2535
}
1742
2536
1743
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
2538
int pubkey_fd = open(pubkey, O_RDONLY);
1745
2539
if(pubkey_fd == -1){
1757
2551
}
1758
2552
}
1759
2553
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
1764
2580
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2586
}
2587
}
2588
2589
/* Remove invalid interface names (except "none") */
2590
{
2591
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2593
interface))){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2598
" \"%s\"\n", interface);
2599
}
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
interface = NULL;
1769
2602
}
1770
2603
}
1771
2604
}
1772
2605
1773
2606
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2607
{
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
2612
goto end;
2613
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
1776
2619
}
1777
2620
1778
2621
if(not debug){
1779
2622
avahi_set_log_function(empty_log);
1780
2623
}
1781
2624
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1814
2625
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
2626
from the signal handler */
1816
2627
/* Initialize the pseudo-RNG for Avahi */
1817
2628
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
1820
2631
fprintf_plus(stderr,
1821
2632
"Avahi: Failed to create simple poll object.\n");
1822
2633
exitcode = EX_UNAVAILABLE;
1886
2697
}
1887
2698
}
1888
2699
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
2700
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2703
/* Look for any good interfaces */
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2705
alphasort);
2706
if(ret >= 1){
2707
/* Add all found interfaces to interfaces list */
2708
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
direntries[i]->d_name);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2715
continue;
2716
}
2717
if(debug){
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
direntries[i]->d_name);
2720
}
2721
free(direntries[i]);
2722
}
2723
free(direntries);
2724
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2729
exitcode = EXIT_FAILURE;
2730
goto end;
2731
}
2732
}
2733
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2736
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2738
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
1974
2751
}
1975
2752
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1993
2753
break;
1994
2754
}
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2755
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2757
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2761
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2768
}
2769
}
2770
}
2771
if(debug and (interfaces_to_take_down == NULL)){
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2773
}
2774
}
2775
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2024
2783
}
2025
2784
2026
2785
if(quit_now){
2027
2786
goto end;
2028
2787
}
2029
2788
2030
ret = init_gnutls_global(pubkey, seckey);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2031
2790
if(ret == -1){
2032
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2792
exitcode = EX_UNAVAILABLE;
2040
2799
goto end;
2041
2800
}
2042
2801
2043
if(mkdtemp(tempdir) == NULL){
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2044
2812
perror_plus("mkdtemp");
2045
2813
goto end;
2046
2814
}
2047
tempdir_created = true;
2048
2815
2049
2816
if(quit_now){
2050
2817
goto end;
2051
2818
}
2052
2819
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2054
2821
fprintf_plus(stderr, "init_gpgme failed\n");
2055
2822
exitcode = EX_UNAVAILABLE;
2056
2823
goto end;
2066
2833
/* Connect directly, do not use Zeroconf */
2067
2834
/* (Mainly meant for debugging) */
2068
2835
char *address = strrchr(connect_to, ':');
2836
2069
2837
if(address == NULL){
2070
2838
fprintf_plus(stderr, "No colon in address\n");
2071
2839
exitcode = EX_USAGE;
2076
2844
goto end;
2077
2845
}
2078
2846
2079
uint16_t port;
2847
in_port_t port;
2080
2848
errno = 0;
2081
2849
tmpmax = strtoimax(address+1, &tmp, 10);
2082
2850
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2851
or tmpmax != (in_port_t)tmpmax){
2084
2852
fprintf_plus(stderr, "Bad port number\n");
2085
2853
exitcode = EX_USAGE;
2086
2854
goto end;
2087
2855
}
2088
2856
2089
2857
if(quit_now){
2090
2858
goto end;
2091
2859
}
2092
2860
2093
port = (uint16_t)tmpmax;
2861
port = (in_port_t)tmpmax;
2094
2862
*address = '\0';
2095
2863
/* Colon in address indicates IPv6 */
2096
2864
int af;
2112
2880
}
2113
2881
2114
2882
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2883
ret = start_mandos_communication(address, port, if_index, af,
2884
&mc);
2116
2885
if(quit_now or ret == 0){
2117
2886
break;
2118
2887
}
2120
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
2890
(int)retry_interval);
2122
2891
}
2123
sleep((int)retry_interval);
2892
sleep((unsigned int)retry_interval);
2124
2893
}
2125
2894
2126
if (not quit_now){
2895
if(not quit_now){
2127
2896
exitcode = EXIT_SUCCESS;
2128
2897
}
2129
2898
2144
2913
config.publish_domain = 0;
2145
2914
2146
2915
/* Allocate a new server */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2150
2918
2151
2919
/* Free the Avahi configuration data */
2152
2920
avahi_server_config_free(&config);
2155
2923
/* Check if creating the Avahi server object succeeded */
2156
2924
if(mc.server == NULL){
2157
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2926
avahi_strerror(ret));
2159
2927
exitcode = EX_UNAVAILABLE;
2160
2928
goto end;
2161
2929
}
2167
2935
/* Create the Avahi service browser */
2168
2936
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
2937
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2938
NULL, 0, browse_callback,
2939
(void *)&mc);
2171
2940
if(sb == NULL){
2172
2941
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
2942
avahi_strerror(avahi_server_errno(mc.server)));
2184
2953
if(debug){
2185
2954
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
2955
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2956
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2190
2959
if(debug){
2191
2960
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
2961
(ret == 0) ? "successfully" : "with error");
2195
2964
end:
2196
2965
2197
2966
if(debug){
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2199
2974
}
2200
2975
2201
2976
/* Cleanup things */
2977
free(mc.interfaces);
2978
2202
2979
if(sb != NULL)
2203
2980
avahi_s_service_browser_free(sb);
2204
2981
2205
2982
if(mc.server != NULL)
2206
2983
avahi_server_free(mc.server);
2207
2984
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2210
2987
2211
2988
if(gnutls_initialized){
2212
2989
gnutls_certificate_free_credentials(mc.cred);
2213
gnutls_global_deinit();
2214
2990
gnutls_dh_params_deinit(mc.dh_params);
2215
2991
}
2216
2992
2224
3000
mc.current_server->prev->next = NULL;
2225
3001
while(mc.current_server != NULL){
2226
3002
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
2227
3011
free(mc.current_server);
2228
3012
mc.current_server = next;
2229
3013
}
2230
3014
}
2231
3015
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
3016
/* Re-raise privileges */
2236
3017
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
2241
3045
}
2242
3046
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
2259
3051
}
2260
3052
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
3053
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
2266
3109
}
2267
3110
2268
3111
/* Removes the GPGME temp directory and all files inside */
2269
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
2290
}
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2301
}
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2302
3114
}
2303
3115
2304
3116
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0