To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.3.10
- compare with another revision
- download diff
- download tarball
- view history from revision 505.3.10
- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- 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() */
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,
94
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
89
WEXITSTATUS(), WTERMSIG() */
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() */
104
90
105
91
#ifdef __linux__
106
92
#include <sys/klog.h> /* klogctl() */
148
134
static const char sys_class_net[] = "/sys/class/net";
149
135
char *connect_to = NULL;
150
136
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
137
155
138
/* Doubly linked list that need to be circularly linked when used */
156
139
typedef struct server{
157
140
const char *ip;
158
in_port_t port;
141
uint16_t port;
159
142
AvahiIfIndex if_index;
160
143
int af;
161
144
struct timespec last_seen;
165
148
166
149
/* Used for passing in values through the Avahi callback functions */
167
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
168
152
AvahiServer *server;
169
153
gnutls_certificate_credentials_t cred;
170
154
unsigned int dh_bits;
172
156
const char *priority;
173
157
gpgme_ctx_t ctx;
174
158
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
159
} mandos_context;
178
160
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
181
166
182
167
sig_atomic_t quit_now = 0;
183
168
int signal_received = 0;
184
169
185
170
/* Function to use when printing errors */
186
171
void perror_plus(const char *print_text){
187
int e = errno;
188
172
fprintf(stderr, "Mandos plugin %s: ",
189
173
program_invocation_short_name);
190
errno = e;
191
174
perror(print_text);
192
175
}
193
176
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
177
int fprintf_plus(FILE *stream, const char *format, ...){
196
178
va_list ap;
197
179
va_start (ap, format);
198
180
199
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
182
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
184
}
203
185
204
186
/*
206
188
* bytes. "buffer_capacity" is how much is currently allocated,
207
189
* "buffer_length" is how much is already used.
208
190
*/
209
__attribute__((nonnull, warn_unused_result))
210
191
size_t incbuffer(char **buffer, size_t buffer_length,
211
192
size_t buffer_capacity){
212
193
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;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
219
196
return 0;
220
197
}
221
*buffer = new_buf;
222
198
buffer_capacity += BUFFER_SIZE;
223
199
}
224
200
return buffer_capacity;
225
201
}
226
202
227
203
/* 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){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
231
206
int ret;
232
207
server *new_server = malloc(sizeof(server));
233
208
if(new_server == NULL){
234
209
perror_plus("malloc");
235
return false;
210
return -1;
236
211
}
237
212
*new_server = (server){ .ip = strdup(ip),
238
213
.port = port,
240
215
.af = af };
241
216
if(new_server->ip == NULL){
242
217
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;
218
return -1;
259
219
}
260
220
/* Special case of first server */
261
if(*current_server == NULL){
221
if (mc.current_server == NULL){
262
222
new_server->next = new_server;
263
223
new_server->prev = new_server;
264
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
265
226
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
269
229
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
273
238
}
274
239
275
240
/*
276
241
* Initialize GPGME.
277
242
*/
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){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
283
245
gpgme_error_t rc;
284
246
gpgme_engine_info_t engine_info;
285
247
248
286
249
/*
287
250
* Helper function to insert pub and seckey to the engine keyring.
288
251
*/
289
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
290
253
int ret;
291
254
int fd;
292
255
gpgme_data_t pgp_data;
304
267
return false;
305
268
}
306
269
307
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
308
271
if(rc != GPG_ERR_NO_ERROR){
309
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
273
gpgme_strsource(rc), gpgme_strerror(rc));
311
274
return false;
312
275
}
313
276
314
ret = close(fd);
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
278
if(ret == -1){
316
279
perror_plus("close");
317
280
}
354
317
}
355
318
356
319
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
358
321
if(rc != GPG_ERR_NO_ERROR){
359
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
373
336
* Decrypt OpenPGP data.
374
337
* Returns -1 on error
375
338
*/
376
__attribute__((nonnull, warn_unused_result))
377
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
340
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
341
char **plaintext){
381
342
gpgme_data_t dh_crypto, dh_plain;
382
343
gpgme_error_t rc;
383
344
ssize_t ret;
409
370
410
371
/* Decrypt data from the cryptotext data buffer to the plaintext
411
372
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
374
if(rc != GPG_ERR_NO_ERROR){
414
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
376
gpgme_strsource(rc), gpgme_strerror(rc));
416
377
plaintext_length = -1;
417
378
if(debug){
418
379
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
420
381
if(result == NULL){
421
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
383
} else {
499
460
return plaintext_length;
500
461
}
501
462
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);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
513
469
}
514
470
515
471
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
472
static void debuggnutls(__attribute__((unused)) int level,
518
473
const char* string){
519
474
fprintf_plus(stderr, "GnuTLS: %s", string);
520
475
}
521
476
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
477
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
478
const char *seckeyfilename){
527
479
int ret;
528
unsigned int uret;
529
480
530
481
if(debug){
531
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
483
}
533
484
485
ret = gnutls_global_init();
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
489
return -1;
490
}
491
534
492
if(debug){
535
493
/* "Use a log level over 10 to enable all debugging options."
536
494
* - GnuTLS manual
540
498
}
541
499
542
500
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
502
if(ret != GNUTLS_E_SUCCESS){
545
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
504
safer_gnutls_strerror(ret));
505
gnutls_global_deinit();
547
506
return -1;
548
507
}
549
508
555
514
}
556
515
557
516
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
559
518
GNUTLS_OPENPGP_FMT_BASE64);
560
519
if(ret != GNUTLS_E_SUCCESS){
561
520
fprintf_plus(stderr,
567
526
}
568
527
569
528
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
571
530
if(ret != GNUTLS_E_SUCCESS){
572
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
532
" initialization: %s\n",
574
533
safer_gnutls_strerror(ret));
575
534
goto globalfail;
576
535
}
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
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
755
544
756
545
return 0;
757
546
758
547
globalfail:
759
548
760
gnutls_certificate_free_credentials(mc->cred);
761
gnutls_dh_params_deinit(mc->dh_params);
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
762
552
return -1;
763
553
}
764
554
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
767
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
768
556
int ret;
769
557
/* GnuTLS session creation */
770
558
do {
782
570
{
783
571
const char *err;
784
572
do {
785
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
786
574
if(quit_now){
787
575
gnutls_deinit(*session);
788
576
return -1;
799
587
800
588
do {
801
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
802
mc->cred);
590
mc.cred);
803
591
if(quit_now){
804
592
gnutls_deinit(*session);
805
593
return -1;
815
603
/* ignore client certificate if any. */
816
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
605
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
818
608
return 0;
819
609
}
820
610
822
612
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
613
__attribute__((unused)) const char *txt){}
824
614
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
615
/* Called when a Mandos server is found */
1044
__attribute__((nonnull, warn_unused_result))
1045
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
1046
617
AvahiIfIndex if_index,
1047
int af, mandos_context *mc){
618
int af){
1048
619
int ret, tcp_sd = -1;
1049
620
ssize_t sret;
1050
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1051
625
char *buffer = NULL;
1052
626
char *decrypted_buffer = NULL;
1053
627
size_t buffer_length = 0;
1056
630
int retval = -1;
1057
631
gnutls_session_t session;
1058
632
int pf; /* Protocol family */
1059
bool route_added = false;
1060
633
1061
634
errno = 0;
1062
635
1078
651
return -1;
1079
652
}
1080
653
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1084
bool match = false;
1085
{
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
match = true;
1092
break;
1093
}
1094
}
1095
}
1096
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
if(debug){
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1103
} else {
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1105
" \"%s\"\n",
1106
if_indextoname((unsigned int)if_index,
1107
interface));
1108
}
1109
}
1110
return -1;
1111
}
1112
}
1113
1114
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
1115
655
if(ret != 0){
1116
656
return -1;
1117
657
}
1118
658
1119
659
if(debug){
1120
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1121
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
1122
662
}
1123
663
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
665
if(tcp_sd < 0){
1126
666
int e = errno;
1127
667
perror_plus("socket");
1134
674
goto mandos_end;
1135
675
}
1136
676
677
memset(&to, 0, sizeof(to));
1137
678
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1141
681
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
1145
684
}
1146
685
if(ret < 0 ){
1147
686
int e = errno;
1156
695
goto mandos_end;
1157
696
}
1158
697
if(af == AF_INET6){
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
1162
705
if(if_index == AVAHI_IF_UNSPEC){
1163
706
fprintf_plus(stderr, "An IPv6 link-local address is"
1164
707
" incomplete without a network interface\n");
1166
709
goto mandos_end;
1167
710
}
1168
711
/* Set the network interface number as scope */
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1170
713
}
1171
714
} else {
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1173
718
}
1174
719
1175
720
if(quit_now){
1183
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1184
729
perror_plus("if_indextoname");
1185
730
} else {
1186
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1187
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1188
733
}
1189
734
} else {
1190
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1191
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1192
737
}
1193
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1194
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
1275
779
}
1276
780
1277
781
const char *out = mandos_protocol_version;
1313
817
goto mandos_end;
1314
818
}
1315
819
1316
/* This casting via intptr_t is to eliminate warning about casting
1317
an int to a pointer type. This is exactly how the GnuTLS Guile
1318
function "set-session-transport-fd!" does it. */
1319
gnutls_transport_set_ptr(session,
1320
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1321
822
1322
823
if(quit_now){
1323
824
errno = EINTR;
1428
929
if(buffer_length > 0){
1429
930
ssize_t decrypted_buffer_size;
1430
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1431
&decrypted_buffer, mc);
932
&decrypted_buffer);
1432
933
if(decrypted_buffer_size >= 0){
1433
934
1434
clearerr(stdout);
1435
935
written = 0;
1436
936
while(written < (size_t) decrypted_buffer_size){
1437
937
if(quit_now){
1453
953
}
1454
954
written += (size_t)ret;
1455
955
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
956
retval = 0;
1467
957
}
1468
958
}
1471
961
1472
962
mandos_end:
1473
963
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
964
int e = errno;
1481
965
free(decrypted_buffer);
1482
966
free(buffer);
1483
967
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
969
}
1486
970
if(ret == -1){
1487
971
if(e == 0){
1512
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1513
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1514
998
flags,
1515
void *mc){
1516
if(r == NULL){
1517
return;
1518
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1519
1001
1520
1002
/* Called whenever a service has been resolved successfully or
1521
1003
timed out */
1522
1004
1523
1005
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
1006
return;
1526
1007
}
1527
1008
1531
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1532
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1533
1014
domain,
1534
avahi_strerror(avahi_server_errno
1535
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1536
1016
break;
1537
1017
1538
1018
case AVAHI_RESOLVER_FOUND:
1544
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1545
1025
host_name, ip, (intmax_t)interface, port);
1546
1026
}
1547
int ret = start_mandos_communication(ip, (in_port_t)port,
1548
interface,
1549
avahi_proto_to_af(proto),
1550
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1551
1029
if(ret == 0){
1552
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1553
1031
} else {
1554
if(not add_server(ip, (in_port_t)port, interface,
1555
avahi_proto_to_af(proto),
1556
&((mandos_context*)mc)->current_server)){
1557
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1558
" list\n", name);
1559
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1560
1034
}
1561
1035
}
1562
1036
}
1572
1046
const char *domain,
1573
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1574
1048
flags,
1575
void *mc){
1576
if(b == NULL){
1577
return;
1578
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1579
1051
1580
1052
/* Called whenever a new services becomes available on the LAN or
1581
1053
is removed from the LAN */
1589
1061
case AVAHI_BROWSER_FAILURE:
1590
1062
1591
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1592
avahi_strerror(avahi_server_errno
1593
(((mandos_context*)mc)->server)));
1594
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1595
1066
return;
1596
1067
1597
1068
case AVAHI_BROWSER_NEW:
1600
1071
the callback function is called the Avahi server will free the
1601
1072
resolver for us. */
1602
1073
1603
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1604
interface, protocol, name, type,
1605
domain, protocol, 0,
1606
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1607
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1608
1078
" %s\n", name,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1611
1080
break;
1612
1081
1613
1082
case AVAHI_BROWSER_REMOVE:
1632
1101
signal_received = sig;
1633
1102
int old_errno = errno;
1634
1103
/* set main loop to exit */
1635
if(simple_poll != NULL){
1636
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1637
1106
}
1638
1107
errno = old_errno;
1639
1108
}
1640
1109
1641
__attribute__((nonnull, warn_unused_result))
1642
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1111
int ret;
1644
int old_errno;
1645
1112
1646
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1114
if(s < 0){
1648
old_errno = errno;
1649
1115
perror_plus("socket");
1650
errno = old_errno;
1651
1116
return false;
1652
1117
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1118
strcpy(ifr->ifr_name, ifname);
1655
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1120
if(ret == -1){
1657
1121
if(debug){
1658
old_errno = errno;
1659
1122
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1666
1123
}
1667
1124
return false;
1668
1125
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1126
return true;
1675
1127
}
1676
1128
1677
__attribute__((nonnull, warn_unused_result))
1678
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1679
1130
1680
1131
/* Reject the loopback device */
1722
1173
* corresponds to an acceptable network device.
1723
1174
* (This function is passed to scandir(3) as a filter function.)
1724
1175
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
1176
int good_interface(const struct dirent *if_entry){
1727
1177
if(if_entry->d_name[0] == '.'){
1728
1178
return 0;
1744
1194
}
1745
1195
1746
1196
/*
1747
* This function determines if a network interface is up.
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_up(const char *interface){
1751
struct ifreq ifr;
1752
if(not get_flags(interface, &ifr)){
1753
if(debug){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1756
}
1757
return false;
1758
}
1759
1760
return (bool)(ifr.ifr_flags & IFF_UP);
1761
}
1762
1763
/*
1764
* This function determines if a network interface is running
1765
*/
1766
__attribute__((nonnull, warn_unused_result))
1767
bool interface_is_running(const char *interface){
1768
struct ifreq ifr;
1769
if(not get_flags(interface, &ifr)){
1770
if(debug){
1771
fprintf_plus(stderr, "Failed to get flags for interface "
1772
"\"%s\"\n", interface);
1773
}
1774
return false;
1775
}
1776
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1778
}
1779
1780
__attribute__((nonnull, pure, warn_unused_result))
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1781
1239
int notdotentries(const struct dirent *direntry){
1782
1240
/* Skip "." and ".." */
1783
1241
if(direntry->d_name[0] == '.'
1790
1248
}
1791
1249
1792
1250
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1794
1251
int runnable_hook(const struct dirent *direntry){
1795
1252
int ret;
1796
1253
size_t sret;
1804
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1805
1262
"abcdefghijklmnopqrstuvwxyz"
1806
1263
"0123456789"
1807
"_.-");
1264
"_-");
1808
1265
if((direntry->d_name)[sret] != '\0'){
1809
1266
/* Contains non-allowed characters */
1810
1267
if(debug){
1814
1271
return 0;
1815
1272
}
1816
1273
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1818
1282
if(ret == -1){
1819
1283
if(debug){
1820
1284
perror_plus("Could not stat hook");
1837
1301
}
1838
1302
return 0;
1839
1303
}
1840
if(debug){
1841
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1842
direntry->d_name);
1843
}
1844
1304
return 1;
1845
1305
}
1846
1306
1847
__attribute__((nonnull, warn_unused_result))
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1850
1308
int ret;
1851
1309
struct timespec now;
1852
1310
struct timespec waited_time;
1853
1311
intmax_t block_time;
1854
1312
1855
1313
while(true){
1856
if(mc->current_server == NULL){
1857
if(debug){
1314
if(mc.current_server == NULL){
1315
if (debug){
1858
1316
fprintf_plus(stderr, "Wait until first server is found."
1859
1317
" No timeout!\n");
1860
1318
}
1861
1319
ret = avahi_simple_poll_iterate(s, -1);
1862
1320
} else {
1863
if(debug){
1321
if (debug){
1864
1322
fprintf_plus(stderr, "Check current_server if we should run"
1865
1323
" it, or wait\n");
1866
1324
}
1873
1331
/* Calculating in ms how long time between now and server
1874
1332
who we visted longest time ago. Now - last seen. */
1875
1333
waited_time.tv_sec = (now.tv_sec
1876
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1877
1335
waited_time.tv_nsec = (now.tv_nsec
1878
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1879
1337
/* total time is 10s/10,000ms.
1880
1338
Converting to s from ms by dividing by 1,000,
1881
1339
and ns to ms by dividing by 1,000,000. */
1883
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1884
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1885
1343
1886
if(debug){
1344
if (debug){
1887
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1888
1346
block_time);
1889
1347
}
1890
1348
1891
1349
if(block_time <= 0){
1892
ret = start_mandos_communication(mc->current_server->ip,
1893
mc->current_server->port,
1894
mc->current_server->if_index,
1895
mc->current_server->af, mc);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1896
1354
if(ret == 0){
1897
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1898
1356
return 0;
1899
1357
}
1900
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1901
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1902
1360
if(ret == -1){
1903
1361
perror_plus("clock_gettime");
1904
1362
return -1;
1905
1363
}
1906
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1907
1365
block_time = 0; /* Call avahi to find new Mandos
1908
1366
servers, but don't block */
1909
1367
}
1911
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1912
1370
}
1913
1371
if(ret != 0){
1914
if(ret > 0 or errno != EINTR){
1372
if (ret > 0 or errno != EINTR){
1915
1373
return (ret != 1) ? ret : 0;
1916
1374
}
1917
1375
}
1918
1376
}
1919
1377
}
1920
1378
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1379
bool run_network_hooks(const char *mode, const char *interface,
1923
1380
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1947
1386
if(numhooks == -1){
1948
1387
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1952
struct dirent *direntry;
1953
int ret;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1959
}
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
2006
1395
perror_plus("asprintf");
2007
_exit(EX_OSERR);
1396
continue;
2008
1397
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
2011
1436
free(delaystring);
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
2080
} else {
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
2100
}
2101
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
2107
struct ifreq network;
2108
unsigned int if_index = if_nametoindex(interface);
2109
if(if_index == 0){
2110
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2111
errno = old_errno;
2112
return ENXIO;
2113
}
2114
2115
if(quit_now){
2116
errno = old_errno;
2117
return EINTR;
2118
}
2119
2120
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
2124
ret_errno = errno;
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2126
"\"%s\"\n", interface);
2127
errno = old_errno;
2128
return ret_errno;
2129
}
2130
network.ifr_flags |= IFF_UP; /* set flag */
2131
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
2134
ret_errno = errno;
2135
perror_plus("socket");
2136
errno = old_errno;
2137
return ret_errno;
2138
}
2139
2140
if(quit_now){
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
2145
errno = old_errno;
2146
return EINTR;
2147
}
2148
2149
if(debug){
2150
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2151
interface);
2152
}
2153
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
2160
2161
#ifdef __linux__
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
2173
}
2174
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
2177
#ifdef __linux__
2178
if(restore_loglevel){
2179
ret_linux = klogctl(7, NULL, 0);
2180
if(ret_linux == -1){
2181
perror_plus("klogctl");
2182
}
2183
}
2184
#endif /* __linux__ */
2185
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
2195
2196
/* Close the socket */
2197
ret = close(sd);
2198
if(ret == -1){
2199
perror_plus("close");
2200
}
2201
2202
if(ret_setflags == -1){
2203
errno = ioctl_errno;
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2205
errno = old_errno;
2206
return ioctl_errno;
2207
}
2208
} else if(debug){
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2210
interface);
2211
}
2212
2213
/* Sleep checking until interface is running.
2214
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2216
if(interface_is_running(interface)){
2217
break;
2218
}
2219
struct timespec sleeptime = { .tv_nsec = 250000000 };
2220
ret = nanosleep(&sleeptime, NULL);
2221
if(ret == -1 and errno != EINTR){
2222
perror_plus("nanosleep");
2223
}
2224
}
2225
2226
errno = old_errno;
2227
return 0;
2228
}
2229
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2233
struct ifreq network;
2234
unsigned int if_index = if_nametoindex(interface);
2235
if(if_index == 0){
2236
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2237
errno = old_errno;
2238
return ENXIO;
2239
}
2240
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2243
if(not get_flags(interface, &network) and debug){
2244
ret_errno = errno;
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2246
"\"%s\"\n", interface);
2247
errno = old_errno;
2248
return ret_errno;
2249
}
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
2254
ret_errno = errno;
2255
perror_plus("socket");
2256
errno = old_errno;
2257
return ret_errno;
2258
}
2259
2260
if(debug){
2261
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2262
interface);
2263
}
2264
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
2284
2285
/* Close the socket */
2286
int ret = close(sd);
2287
if(ret == -1){
2288
perror_plus("close");
2289
}
2290
2291
if(ret_setflags == -1){
2292
errno = ioctl_errno;
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2294
errno = old_errno;
2295
return ioctl_errno;
2296
}
2297
} else if(debug){
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2299
interface);
2300
}
2301
2302
errno = old_errno;
2303
return 0;
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
2304
1475
}
2305
1476
2306
1477
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
2312
1478
AvahiSServiceBrowser *sb = NULL;
2313
error_t ret_errno;
1479
int error;
2314
1480
int ret;
2315
1481
intmax_t tmpmax;
2316
1482
char *tmp;
2317
1483
int exitcode = EXIT_SUCCESS;
2318
char *interfaces_to_take_down = NULL;
2319
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
2323
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1493
const char *seckey = PATHDIR "/" SECKEY;
2325
1494
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
char *interfaces_hooks = NULL;
2328
1495
2329
1496
bool gnutls_initialized = false;
2330
1497
bool gpgme_initialized = false;
2382
1549
.doc = "Bit length of the prime number used in the"
2383
1550
" Diffie-Hellman key exchange",
2384
1551
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1552
{ .name = "priority", .key = 130,
2391
1553
.arg = "STRING",
2392
1554
.doc = "GnuTLS priority string for the TLS handshake",
2397
1559
.group = 2 },
2398
1560
{ .name = "retry", .key = 132,
2399
1561
.arg = "SECONDS",
2400
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
2401
1563
.group = 2 },
2402
1564
{ .name = "network-hook-dir", .key = 133,
2403
1565
.arg = "DIR",
2426
1588
connect_to = arg;
2427
1589
break;
2428
1590
case 'i': /* --interface */
2429
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2430
arg, (int)',');
2431
if(ret_errno != 0){
2432
argp_error(state, "%s", strerror(ret_errno));
2433
}
1591
interface = arg;
2434
1592
break;
2435
1593
case 's': /* --seckey */
2436
1594
seckey = arg;
2447
1605
}
2448
1606
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
1607
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
1608
case 130: /* --priority */
2454
1609
mc.priority = arg;
2455
1610
break;
2482
1637
argp_state_help(state, state->out_stream,
2483
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2484
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
2485
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2486
1643
exit(argp_err_exit_status);
2487
1644
break;
2495
1652
.args_doc = "",
2496
1653
.doc = "Mandos client -- Get and decrypt"
2497
1654
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1657
switch(ret){
2501
1658
case 0:
2502
1659
break;
2503
1660
case ENOMEM:
2504
1661
default:
2505
errno = ret_errno;
1662
errno = ret;
2506
1663
perror_plus("argp_parse");
2507
1664
exitcode = EX_OSERR;
2508
1665
goto end;
2511
1668
goto end;
2512
1669
}
2513
1670
}
2514
1671
2515
1672
{
2516
1673
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2518
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
2525
struct stat st;
2526
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2528
int seckey_fd = open(seckey, O_RDONLY);
2529
if(seckey_fd == -1){
2530
perror_plus("open");
2531
} else {
2532
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2533
if(ret == -1){
2534
perror_plus("fstat");
2535
} else {
2536
if(S_ISREG(st.st_mode)
2537
and st.st_uid == 0 and st.st_gid == 0){
2538
ret = fchown(seckey_fd, uid, gid);
2539
if(ret == -1){
2540
perror_plus("fchown");
2541
}
2542
}
2543
}
2544
close(seckey_fd);
2545
}
2546
}
2547
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
int pubkey_fd = open(pubkey, O_RDONLY);
2550
if(pubkey_fd == -1){
2551
perror_plus("open");
2552
} else {
2553
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2554
if(ret == -1){
2555
perror_plus("fstat");
2556
} else {
2557
if(S_ISREG(st.st_mode)
2558
and st.st_uid == 0 and st.st_gid == 0){
2559
ret = fchown(pubkey_fd, uid, gid);
2560
if(ret == -1){
2561
perror_plus("fchown");
2562
}
2563
}
2564
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2591
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2596
}
2597
}
2598
}
2599
2600
/* Remove invalid interface names (except "none") */
2601
{
2602
char *interface = NULL;
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2604
interface))){
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2609
" \"%s\"\n", interface);
2610
}
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2612
interface = NULL;
2613
}
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2614
1731
}
2615
1732
}
2616
1733
2617
1734
/* Run network hooks */
2618
1735
{
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2621
if(interfaces_hooks == NULL){
2622
perror_plus("malloc");
2623
goto end;
2624
}
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2630
1751
}
2631
1752
2632
1753
if(not debug){
2633
1754
avahi_set_log_function(empty_log);
2634
1755
}
2635
1756
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
2636
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2637
1790
from the signal handler */
2638
1791
/* Initialize the pseudo-RNG for Avahi */
2639
1792
srand((unsigned int) time(NULL));
2640
simple_poll = avahi_simple_poll_new();
2641
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2642
1795
fprintf_plus(stderr,
2643
1796
"Avahi: Failed to create simple poll object.\n");
2644
1797
exitcode = EX_UNAVAILABLE;
2708
1861
}
2709
1862
}
2710
1863
2711
/* If no interfaces were specified, make a list */
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2714
/* Look for any good interfaces */
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2716
alphasort);
2717
if(ret >= 1){
2718
/* Add all found interfaces to interfaces list */
2719
for(int i = 0; i < ret; ++i){
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
direntries[i]->d_name);
2722
if(ret_errno != 0){
2723
errno = ret_errno;
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2726
continue;
2727
}
2728
if(debug){
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
direntries[i]->d_name);
2731
}
2732
free(direntries[i]);
2733
}
2734
free(direntries);
2735
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2740
exitcode = EXIT_FAILURE;
2741
goto end;
2742
}
2743
}
2744
2745
/* Bring up interfaces which are down, and remove any "none"s */
2746
{
2747
char *interface = NULL;
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2749
interface))){
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2754
interface);
2755
interface = NULL;
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2760
interface);
2761
interface = NULL;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2762
1949
}
2763
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2764
1968
break;
2765
1969
}
2766
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2768
if(not interface_was_up){
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2772
} else {
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2779
}
2780
}
2781
}
2782
if(debug and (interfaces_to_take_down == NULL)){
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2784
}
2785
}
2786
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2789
if(debug){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2791
mc.interfaces);
2792
}
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2794
1999
}
2795
2000
2796
2001
if(quit_now){
2797
2002
goto end;
2798
2003
}
2799
2004
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2801
2006
if(ret == -1){
2802
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2008
exitcode = EX_UNAVAILABLE;
2810
2015
goto end;
2811
2016
}
2812
2017
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
2018
if(mkdtemp(tempdir) == NULL){
2823
2019
perror_plus("mkdtemp");
2824
2020
goto end;
2825
2021
}
2022
tempdir_created = true;
2826
2023
2827
2024
if(quit_now){
2828
2025
goto end;
2829
2026
}
2830
2027
2831
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2832
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2833
2030
exitcode = EX_UNAVAILABLE;
2834
2031
goto end;
2844
2041
/* Connect directly, do not use Zeroconf */
2845
2042
/* (Mainly meant for debugging) */
2846
2043
char *address = strrchr(connect_to, ':');
2847
2848
2044
if(address == NULL){
2849
2045
fprintf_plus(stderr, "No colon in address\n");
2850
2046
exitcode = EX_USAGE;
2855
2051
goto end;
2856
2052
}
2857
2053
2858
in_port_t port;
2054
uint16_t port;
2859
2055
errno = 0;
2860
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2861
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2862
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2863
2059
fprintf_plus(stderr, "Bad port number\n");
2864
2060
exitcode = EX_USAGE;
2865
2061
goto end;
2866
2062
}
2867
2063
2868
2064
if(quit_now){
2869
2065
goto end;
2870
2066
}
2871
2067
2872
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2873
2069
*address = '\0';
2874
2070
/* Colon in address indicates IPv6 */
2875
2071
int af;
2891
2087
}
2892
2088
2893
2089
while(not quit_now){
2894
ret = start_mandos_communication(address, port, if_index, af,
2895
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2896
2091
if(quit_now or ret == 0){
2897
2092
break;
2898
2093
}
2900
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2901
2096
(int)retry_interval);
2902
2097
}
2903
sleep((unsigned int)retry_interval);
2098
sleep((int)retry_interval);
2904
2099
}
2905
2100
2906
if(not quit_now){
2101
if (not quit_now){
2907
2102
exitcode = EXIT_SUCCESS;
2908
2103
}
2909
2104
2924
2119
config.publish_domain = 0;
2925
2120
2926
2121
/* Allocate a new server */
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2929
2125
2930
2126
/* Free the Avahi configuration data */
2931
2127
avahi_server_config_free(&config);
2934
2130
/* Check if creating the Avahi server object succeeded */
2935
2131
if(mc.server == NULL){
2936
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2133
avahi_strerror(error));
2938
2134
exitcode = EX_UNAVAILABLE;
2939
2135
goto end;
2940
2136
}
2946
2142
/* Create the Avahi service browser */
2947
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2948
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2949
NULL, 0, browse_callback,
2950
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2951
2146
if(sb == NULL){
2952
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2953
2148
avahi_strerror(avahi_server_errno(mc.server)));
2964
2159
if(debug){
2965
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2966
2161
}
2967
2968
ret = avahi_loop_with_timeout(simple_poll,
2969
(int)(retry_interval * 1000), &mc);
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2970
2165
if(debug){
2971
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2972
2167
(ret == 0) ? "successfully" : "with error");
2975
2170
end:
2976
2171
2977
2172
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2174
}
2986
2175
2987
2176
/* Cleanup things */
2988
free(mc.interfaces);
2989
2990
2177
if(sb != NULL)
2991
2178
avahi_s_service_browser_free(sb);
2992
2179
2993
2180
if(mc.server != NULL)
2994
2181
avahi_server_free(mc.server);
2995
2182
2996
if(simple_poll != NULL)
2997
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2998
2185
2999
2186
if(gnutls_initialized){
3000
2187
gnutls_certificate_free_credentials(mc.cred);
2188
gnutls_global_deinit();
3001
2189
gnutls_dh_params_deinit(mc.dh_params);
3002
2190
}
3003
2191
3004
2192
if(gpgme_initialized){
3005
2193
gpgme_release(mc.ctx);
3006
2194
}
3007
2195
3008
2196
/* Cleans up the circular linked list of Mandos servers the client
3009
2197
has seen */
3010
2198
if(mc.current_server != NULL){
3011
2199
mc.current_server->prev->next = NULL;
3012
2200
while(mc.current_server != NULL){
3013
2201
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
2202
free(mc.current_server);
3023
2203
mc.current_server = next;
3024
2204
}
3025
2205
}
3026
2206
3027
/* Re-raise privileges */
2207
/* Re-raise priviliges */
3028
2208
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
3056
2217
}
3057
2218
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
3062
2235
}
3063
2236
}
3064
3065
free(interfaces_to_take_down);
3066
free(interfaces_hooks);
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2243
2244
/* Removes the GPGME temp directory and all files inside */
2245
if(tempdir_created){
3070
2246
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
3084
2251
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
/* Removes the GPGME temp directory and all files inside */
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
direntry->d_name);
2256
if(ret < 0){
2257
perror_plus("asprintf");
2258
continue;
2259
}
2260
ret = remove(fullname);
2261
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
2264
}
2265
free(fullname);
2266
}
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
2273
}
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
2277
}
3125
2278
}
3126
2279
3127
2280
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0