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- Committer: Teddy Hogeborn
- Date: 2018-01-29 19:43:17 UTC
- Revision ID: teddy@recompile.se-20180129194317-07fz89jdxefuphq1
Use "simply expanded" variables in Makefile
* (Makefile): Use "simply expanded" variables where possible.
* (Makefile): Use "simply expanded" variables where possible.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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 © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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
stdout, ferror() */
44
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;
138
152
uid_t uid = 65534;
139
153
gid_t gid = 65534;
140
154
141
155
/* Doubly linked list that need to be circularly linked when used */
142
156
typedef struct server{
143
157
const char *ip;
144
uint16_t port;
158
in_port_t port;
145
159
AvahiIfIndex if_index;
146
160
int af;
147
161
struct timespec last_seen;
151
165
152
166
/* Used for passing in values through the Avahi callback functions */
153
167
typedef struct {
154
AvahiSimplePoll *simple_poll;
155
168
AvahiServer *server;
156
169
gnutls_certificate_credentials_t cred;
157
170
unsigned int dh_bits;
159
172
const char *priority;
160
173
gpgme_ctx_t ctx;
161
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
162
177
} mandos_context;
163
178
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
169
181
170
182
sig_atomic_t quit_now = 0;
171
183
int signal_received = 0;
179
191
perror(print_text);
180
192
}
181
193
182
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
195
int fprintf_plus(FILE *stream, const char *format, ...){
184
196
va_list ap;
185
197
va_start (ap, format);
186
198
187
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
200
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
202
}
191
203
192
204
/*
194
206
* bytes. "buffer_capacity" is how much is currently allocated,
195
207
* "buffer_length" is how much is already used.
196
208
*/
209
__attribute__((nonnull, warn_unused_result))
197
210
size_t incbuffer(char **buffer, size_t buffer_length,
198
211
size_t buffer_capacity){
199
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
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;
202
219
return 0;
203
220
}
221
*buffer = new_buf;
204
222
buffer_capacity += BUFFER_SIZE;
205
223
}
206
224
return buffer_capacity;
207
225
}
208
226
209
227
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
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){
212
231
int ret;
213
232
server *new_server = malloc(sizeof(server));
214
233
if(new_server == NULL){
221
240
.af = af };
222
241
if(new_server->ip == NULL){
223
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);
224
258
return false;
225
259
}
226
260
/* Special case of first server */
227
if (mc.current_server == NULL){
261
if(*current_server == NULL){
228
262
new_server->next = new_server;
229
263
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
264
*current_server = new_server;
232
265
} else {
233
new_server->next = mc.current_server;
234
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;
235
269
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
270
(*current_server)->prev = new_server;
242
271
}
243
272
return true;
244
273
}
246
275
/*
247
276
* Initialize GPGME.
248
277
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
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){
251
283
gpgme_error_t rc;
252
284
gpgme_engine_info_t engine_info;
253
285
254
255
286
/*
256
287
* Helper function to insert pub and seckey to the engine keyring.
257
288
*/
258
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
259
290
int ret;
260
291
int fd;
261
292
gpgme_data_t pgp_data;
273
304
return false;
274
305
}
275
306
276
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
277
308
if(rc != GPG_ERR_NO_ERROR){
278
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
310
gpgme_strsource(rc), gpgme_strerror(rc));
280
311
return false;
281
312
}
282
313
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
284
315
if(ret == -1){
285
316
perror_plus("close");
286
317
}
323
354
}
324
355
325
356
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
327
358
if(rc != GPG_ERR_NO_ERROR){
328
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
373
* Decrypt OpenPGP data.
343
374
* Returns -1 on error
344
375
*/
376
__attribute__((nonnull, warn_unused_result))
345
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
378
size_t crypto_size,
347
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
348
381
gpgme_data_t dh_crypto, dh_plain;
349
382
gpgme_error_t rc;
350
383
ssize_t ret;
376
409
377
410
/* Decrypt data from the cryptotext data buffer to the plaintext
378
411
data buffer */
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
413
if(rc != GPG_ERR_NO_ERROR){
381
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
415
gpgme_strsource(rc), gpgme_strerror(rc));
383
416
plaintext_length = -1;
384
417
if(debug){
385
418
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
387
420
if(result == NULL){
388
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
422
} else {
466
499
return plaintext_length;
467
500
}
468
501
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
473
ret = "(unknown)";
474
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);
475
513
}
476
514
477
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
478
517
static void debuggnutls(__attribute__((unused)) int level,
479
518
const char* string){
480
519
fprintf_plus(stderr, "GnuTLS: %s", string);
481
520
}
482
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
523
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
485
527
int ret;
528
unsigned int uret;
486
529
487
530
if(debug){
488
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
532
}
490
533
491
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
495
return -1;
496
}
497
498
534
if(debug){
499
535
/* "Use a log level over 10 to enable all debugging options."
500
536
* - GnuTLS manual
504
540
}
505
541
506
542
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
508
544
if(ret != GNUTLS_E_SUCCESS){
509
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
546
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
512
547
return -1;
513
548
}
514
549
520
555
}
521
556
522
557
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
524
559
GNUTLS_OPENPGP_FMT_BASE64);
525
560
if(ret != GNUTLS_E_SUCCESS){
526
561
fprintf_plus(stderr,
532
567
}
533
568
534
569
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
536
571
if(ret != GNUTLS_E_SUCCESS){
537
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
573
" initialization: %s\n",
539
574
safer_gnutls_strerror(ret));
540
575
goto globalfail;
541
576
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
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
if(params.data == NULL){
617
dhparamsfilename = NULL;
618
}
619
if(dhparamsfilename == NULL){
620
break;
621
}
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
629
}
630
free(params.data);
631
} while(false);
632
}
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
do {
639
int secfile = open(seckeyfilename, O_RDONLY);
640
if(secfile == -1){
641
perror_plus("open");
642
break;
643
}
644
size_t buffer_capacity = 0;
645
while(true){
646
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer.size,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
651
free(buffer.data);
652
buffer.data = NULL;
653
break;
654
}
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
657
BUFFER_SIZE);
658
/* EOF */
659
if(bytes_read == 0){
660
break;
661
}
662
/* check bytes_read for failure */
663
if(bytes_read < 0){
664
perror_plus("read");
665
free(buffer.data);
666
buffer.data = NULL;
667
break;
668
}
669
buffer.size += (unsigned int)bytes_read;
670
}
671
close(secfile);
672
} while(false);
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
676
{
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
" structure: %s",
682
safer_gnutls_strerror(ret));
683
free(buffer.data);
684
buffer.data = NULL;
685
} else {
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
691
privkey = NULL;
692
}
693
free(buffer.data);
694
buffer.data = NULL;
695
if(privkey != NULL){
696
/* Use private key to suggest an appropriate
697
sec_param */
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
700
if(debug){
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
704
(sec_param)));
705
}
706
}
707
}
708
}
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
if(debug){
713
fprintf_plus(stderr, "Falling back to security parameter"
714
" \"%s\"\n",
715
safe_string(gnutls_sec_param_get_name
716
(sec_param)));
717
}
718
}
719
}
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
if(uret != 0){
722
mc->dh_bits = uret;
723
if(debug){
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
mc->dh_bits);
729
}
730
} else {
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
734
(sec_param)),
735
safer_gnutls_strerror(ret));
736
goto globalfail;
737
}
738
} else if(debug){
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
mc->dh_bits);
741
}
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
747
goto globalfail;
748
}
749
}
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
751
551
752
return 0;
552
753
553
754
globalfail:
554
755
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
558
758
return -1;
559
759
}
560
760
561
static int init_gnutls_session(gnutls_session_t *session){
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
562
764
int ret;
563
765
/* GnuTLS session creation */
564
766
do {
576
778
{
577
779
const char *err;
578
780
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
782
if(quit_now){
581
783
gnutls_deinit(*session);
582
784
return -1;
593
795
594
796
do {
595
797
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
798
mc->cred);
597
799
if(quit_now){
598
800
gnutls_deinit(*session);
599
801
return -1;
609
811
/* ignore client certificate if any. */
610
812
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
813
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
814
return 0;
615
815
}
616
816
618
818
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
819
__attribute__((unused)) const char *txt){}
620
820
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
826
if(seteuid(0) == -1){
827
ret = errno;
828
}
829
errno = old_errno;
830
return ret;
831
}
832
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
839
errno = old_errno;
840
return ret;
841
}
842
if(setuid(0) == -1){
843
ret = errno;
844
}
845
errno = old_errno;
846
return ret;
847
}
848
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
854
if(seteuid(uid) == -1){
855
ret = errno;
856
}
857
errno = old_errno;
858
return ret;
859
}
860
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
866
if(setuid(uid) == -1){
867
ret = errno;
868
}
869
errno = old_errno;
870
return ret;
871
}
872
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
876
const char *address,
877
AvahiIfIndex if_index){
878
int ret;
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
885
if(debug){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
888
}
889
return false;
890
}
891
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
895
return false;
896
}
897
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
if(devnull == -1){
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
901
return false;
902
}
903
pid_t pid = fork();
904
if(pid == 0){
905
/* Child */
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
908
if(errno != 0){
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
911
} else {
912
/* Set group */
913
errno = 0;
914
ret = setgid(0);
915
if(ret == -1){
916
perror_plus("setgid");
917
_exit(EX_NOPERM);
918
}
919
/* Reset supplementary groups */
920
errno = 0;
921
ret = setgroups(0, NULL);
922
if(ret == -1){
923
perror_plus("setgroups");
924
_exit(EX_NOPERM);
925
}
926
}
927
ret = dup2(devnull, STDIN_FILENO);
928
if(ret == -1){
929
perror_plus("dup2(devnull, STDIN_FILENO)");
930
_exit(EX_OSERR);
931
}
932
ret = close(devnull);
933
if(ret == -1){
934
perror_plus("close");
935
_exit(EX_OSERR);
936
}
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
if(ret == -1){
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
_exit(EX_OSERR);
941
}
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
943
O_RDONLY
944
| O_DIRECTORY
945
| O_PATH
946
| O_CLOEXEC));
947
if(helperdir_fd == -1){
948
perror_plus("open");
949
_exit(EX_UNAVAILABLE);
950
}
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
helper, O_RDONLY));
953
if(helper_fd == -1){
954
perror_plus("openat");
955
close(helperdir_fd);
956
_exit(EX_UNAVAILABLE);
957
}
958
close(helperdir_fd);
959
#ifdef __GNUC__
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
962
#endif
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
966
environ) == -1){
967
#ifdef __GNUC__
968
#pragma GCC diagnostic pop
969
#endif
970
perror_plus("fexecve");
971
_exit(EXIT_FAILURE);
972
}
973
}
974
if(pid == -1){
975
perror_plus("fork");
976
return false;
977
}
978
int status;
979
pid_t pret = -1;
980
errno = 0;
981
do {
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
989
}
990
if(kill(pid, SIGTERM) == -1){
991
perror_plus("kill");
992
}
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
995
" helper program");
996
}
997
return false;
998
}
999
} while(pret == -1 and errno == EINTR);
1000
if(pret == -1){
1001
perror_plus("waitpid");
1002
return false;
1003
}
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1008
return false;
1009
}
1010
return true;
1011
}
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1015
return false;
1016
}
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
return false;
1019
}
1020
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1024
if(debug){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
}
1027
return add_delete_local_route(true, address, if_index);
1028
}
1029
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1033
if(debug){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
}
1036
return add_delete_local_route(false, address, if_index);
1037
}
1038
621
1039
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, uint16_t port,
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
623
1042
AvahiIfIndex if_index,
624
int af){
1043
int af, mandos_context *mc){
625
1044
int ret, tcp_sd = -1;
626
1045
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1046
struct sockaddr_storage to;
631
1047
char *buffer = NULL;
632
1048
char *decrypted_buffer = NULL;
633
1049
size_t buffer_length = 0;
636
1052
int retval = -1;
637
1053
gnutls_session_t session;
638
1054
int pf; /* Protocol family */
1055
bool route_added = false;
639
1056
640
1057
errno = 0;
641
1058
657
1074
return -1;
658
1075
}
659
1076
660
ret = init_gnutls_session(&session);
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1080
bool match = false;
1081
{
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
661
1111
if(ret != 0){
662
1112
return -1;
663
1113
}
664
1114
665
1115
if(debug){
666
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
1117
PRIuMAX "\n", ip, (uintmax_t)port);
668
1118
}
669
1119
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1121
if(tcp_sd < 0){
672
1122
int e = errno;
673
1123
perror_plus("socket");
680
1130
goto mandos_end;
681
1131
}
682
1132
683
memset(&to, 0, sizeof(to));
684
1133
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1137
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
690
1141
}
691
1142
if(ret < 0 ){
692
1143
int e = errno;
701
1152
goto mandos_end;
702
1153
}
703
1154
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
711
1158
if(if_index == AVAHI_IF_UNSPEC){
712
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
713
1160
" incomplete without a network interface\n");
715
1162
goto mandos_end;
716
1163
}
717
1164
/* Set the network interface number as scope */
718
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
719
1166
}
720
1167
} else {
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
724
1169
}
725
1170
726
1171
if(quit_now){
734
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
1180
perror_plus("if_indextoname");
736
1181
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
739
1184
}
740
1185
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
743
1188
}
744
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
747
if(af == AF_INET6){
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
750
} else {
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
753
}
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
760
}
761
}
762
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
if(af == AF_INET6){
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
} else {
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
}
773
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
785
1271
}
786
1272
787
1273
const char *out = mandos_protocol_version;
938
1424
if(buffer_length > 0){
939
1425
ssize_t decrypted_buffer_size;
940
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
941
&decrypted_buffer);
1427
&decrypted_buffer, mc);
942
1428
if(decrypted_buffer_size >= 0){
943
1429
1430
clearerr(stdout);
944
1431
written = 0;
945
1432
while(written < (size_t) decrypted_buffer_size){
946
1433
if(quit_now){
962
1449
}
963
1450
written += (size_t)ret;
964
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
965
1462
retval = 0;
966
1463
}
967
1464
}
970
1467
971
1468
mandos_end:
972
1469
{
1470
if(route_added){
1471
if(not delete_local_route(ip, if_index)){
1472
fprintf_plus(stderr, "Failed to delete local route to %s on"
1473
" interface %d", ip, if_index);
1474
}
1475
}
973
1476
int e = errno;
974
1477
free(decrypted_buffer);
975
1478
free(buffer);
976
1479
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
978
1481
}
979
1482
if(ret == -1){
980
1483
if(e == 0){
1005
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
1006
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1007
1510
flags,
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
1010
1515
1011
1516
/* Called whenever a service has been resolved successfully or
1012
1517
timed out */
1013
1518
1014
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1015
1521
return;
1016
1522
}
1017
1523
1021
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
1529
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1025
1532
break;
1026
1533
1027
1534
case AVAHI_RESOLVER_FOUND:
1033
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
1541
host_name, ip, (intmax_t)interface, port);
1035
1542
}
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1038
1547
if(ret == 0){
1039
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1040
1549
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1043
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1554
" list\n", name);
1045
1555
}
1058
1568
const char *domain,
1059
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1570
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1063
1575
1064
1576
/* Called whenever a new services becomes available on the LAN or
1065
1577
is removed from the LAN */
1073
1585
case AVAHI_BROWSER_FAILURE:
1074
1586
1075
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1078
1591
return;
1079
1592
1080
1593
case AVAHI_BROWSER_NEW:
1083
1596
the callback function is called the Avahi server will free the
1084
1597
resolver for us. */
1085
1598
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1089
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
1604
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1092
1607
break;
1093
1608
1094
1609
case AVAHI_BROWSER_REMOVE:
1113
1628
signal_received = sig;
1114
1629
int old_errno = errno;
1115
1630
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1118
1633
}
1119
1634
errno = old_errno;
1120
1635
}
1121
1636
1637
__attribute__((nonnull, warn_unused_result))
1122
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
1639
int ret;
1640
int old_errno;
1124
1641
1125
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
1643
if(s < 0){
1644
old_errno = errno;
1127
1645
perror_plus("socket");
1646
errno = old_errno;
1128
1647
return false;
1129
1648
}
1130
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1131
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
1652
if(ret == -1){
1133
1653
if(debug){
1654
old_errno = errno;
1134
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1135
1657
}
1136
1658
return false;
1137
1659
}
1138
1660
return true;
1139
1661
}
1140
1662
1663
__attribute__((nonnull, warn_unused_result))
1141
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1665
1143
1666
/* Reject the loopback device */
1185
1708
* corresponds to an acceptable network device.
1186
1709
* (This function is passed to scandir(3) as a filter function.)
1187
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1188
1712
int good_interface(const struct dirent *if_entry){
1189
1713
if(if_entry->d_name[0] == '.'){
1190
1714
return 0;
1206
1730
}
1207
1731
1208
1732
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1251
1767
int notdotentries(const struct dirent *direntry){
1252
1768
/* Skip "." and ".." */
1253
1769
if(direntry->d_name[0] == '.'
1260
1776
}
1261
1777
1262
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1263
1780
int runnable_hook(const struct dirent *direntry){
1264
1781
int ret;
1265
1782
size_t sret;
1273
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
1791
"abcdefghijklmnopqrstuvwxyz"
1275
1792
"0123456789"
1276
"_-");
1793
"_.-");
1277
1794
if((direntry->d_name)[sret] != '\0'){
1278
1795
/* Contains non-allowed characters */
1279
1796
if(debug){
1283
1800
return 0;
1284
1801
}
1285
1802
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1294
1804
if(ret == -1){
1295
1805
if(debug){
1296
1806
perror_plus("Could not stat hook");
1320
1830
return 1;
1321
1831
}
1322
1832
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1324
1836
int ret;
1325
1837
struct timespec now;
1326
1838
struct timespec waited_time;
1327
1839
intmax_t block_time;
1328
1840
1329
1841
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1842
if(mc->current_server == NULL){
1843
if(debug){
1332
1844
fprintf_plus(stderr, "Wait until first server is found."
1333
1845
" No timeout!\n");
1334
1846
}
1335
1847
ret = avahi_simple_poll_iterate(s, -1);
1336
1848
} else {
1337
if (debug){
1849
if(debug){
1338
1850
fprintf_plus(stderr, "Check current_server if we should run"
1339
1851
" it, or wait\n");
1340
1852
}
1347
1859
/* Calculating in ms how long time between now and server
1348
1860
who we visted longest time ago. Now - last seen. */
1349
1861
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1351
1863
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1353
1865
/* total time is 10s/10,000ms.
1354
1866
Converting to s from ms by dividing by 1,000,
1355
1867
and ns to ms by dividing by 1,000,000. */
1357
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1358
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1871
1360
if (debug){
1872
if(debug){
1361
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
1874
block_time);
1363
1875
}
1364
1876
1365
1877
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1370
1882
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1883
avahi_simple_poll_quit(s);
1372
1884
return 0;
1373
1885
}
1374
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1376
1888
if(ret == -1){
1377
1889
perror_plus("clock_gettime");
1378
1890
return -1;
1379
1891
}
1380
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1381
1893
block_time = 0; /* Call avahi to find new Mandos
1382
1894
servers, but don't block */
1383
1895
}
1385
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
1898
}
1387
1899
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1389
1901
return (ret != 1) ? ret : 0;
1390
1902
}
1391
1903
}
1392
1904
}
1393
1905
}
1394
1906
1395
/* Set effective uid to 0, return errno */
1396
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1402
}
1403
errno = old_errno;
1404
return ret_errno;
1405
}
1406
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1411
if(ret_errno != 0){
1412
errno = old_errno;
1413
return ret_errno;
1414
}
1415
if(setuid(0) == -1){
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1418
}
1419
errno = old_errno;
1420
return ret_errno;
1421
}
1422
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1428
ret_errno = errno;
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1436
1909
const float delay){
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1442
1928
if(numhooks == -1){
1443
1929
perror_plus("scandir");
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1451
1991
perror_plus("asprintf");
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1510
1996
free(delaystring);
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
1522
2065
} else {
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
1559
2085
}
1560
2086
2087
__attribute__((nonnull, warn_unused_result))
1561
2088
int bring_up_interface(const char *const interface,
1562
2089
const float delay){
1563
int sd = -1;
1564
2090
int old_errno = errno;
1565
int ret_errno = 0;
1566
2091
int ret;
1567
2092
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
2093
unsigned int if_index = if_nametoindex(interface);
1569
2094
if(if_index == 0){
1570
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
2096
errno = old_errno;
1577
2102
return EINTR;
1578
2103
}
1579
2104
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
1632
2183
if(ret == -1){
1633
ret_errno = errno;
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
1634
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1645
2190
errno = old_errno;
1646
return ret_errno;
2191
return ioctl_errno;
1647
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
1648
2196
}
2197
1649
2198
/* Sleep checking until interface is running.
1650
2199
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
1656
2202
break;
1657
2203
}
1658
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
2207
perror_plus("nanosleep");
1662
2208
}
1663
2209
}
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
1668
2224
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2229
ret_errno = errno;
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
return ret_errno;
2234
}
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
2239
ret_errno = errno;
2240
perror_plus("socket");
2241
errno = old_errno;
2242
return ret_errno;
2243
}
2244
2245
if(debug){
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
interface);
2248
}
2249
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
2270
/* Close the socket */
2271
int ret = close(sd);
1673
2272
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
2273
perror_plus("close");
2274
}
2275
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
errno = old_errno;
2280
return ioctl_errno;
2281
}
2282
} else if(debug){
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2284
interface);
1676
2285
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
2286
1680
2287
errno = old_errno;
1681
2288
return 0;
1682
2289
}
1683
2290
1684
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1685
2297
AvahiSServiceBrowser *sb = NULL;
1686
int error;
2298
error_t ret_errno;
1687
2299
int ret;
1688
2300
intmax_t tmpmax;
1689
2301
char *tmp;
1690
2302
int exitcode = EXIT_SUCCESS;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1697
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1698
2309
const char *seckey = PATHDIR "/" SECKEY;
1699
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1700
2313
1701
2314
bool gnutls_initialized = false;
1702
2315
bool gpgme_initialized = false;
1754
2367
.doc = "Bit length of the prime number used in the"
1755
2368
" Diffie-Hellman key exchange",
1756
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1757
2375
{ .name = "priority", .key = 130,
1758
2376
.arg = "STRING",
1759
2377
.doc = "GnuTLS priority string for the TLS handshake",
1793
2411
connect_to = arg;
1794
2412
break;
1795
2413
case 'i': /* --interface */
1796
interface = arg;
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
2416
if(ret_errno != 0){
2417
argp_error(state, "%s", strerror(ret_errno));
2418
}
1797
2419
break;
1798
2420
case 's': /* --seckey */
1799
2421
seckey = arg;
1810
2432
}
1811
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1812
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1813
2438
case 130: /* --priority */
1814
2439
mc.priority = arg;
1815
2440
break;
1855
2480
.args_doc = "",
1856
2481
.doc = "Mandos client -- Get and decrypt"
1857
2482
" passwords from a Mandos server" };
1858
ret = argp_parse(&argp, argc, argv,
1859
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1860
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1861
2486
case 0:
1862
2487
break;
1863
2488
case ENOMEM:
1864
2489
default:
1865
errno = ret;
2490
errno = ret_errno;
1866
2491
perror_plus("argp_parse");
1867
2492
exitcode = EX_OSERR;
1868
2493
goto end;
1871
2496
goto end;
1872
2497
}
1873
2498
}
1874
2499
1875
2500
{
1876
2501
/* Work around Debian bug #633582:
1877
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
1878
2503
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
1881
2510
struct stat st;
1882
2511
1883
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1897
2526
}
1898
2527
}
1899
2528
}
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
close(seckey_fd);
1901
2530
}
1902
2531
}
1903
2532
1904
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
2534
int pubkey_fd = open(pubkey, O_RDONLY);
1906
2535
if(pubkey_fd == -1){
1918
2547
}
1919
2548
}
1920
2549
}
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1922
}
1923
}
1924
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
1925
2576
/* Lower privileges */
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2582
}
2583
}
2584
2585
/* Remove invalid interface names (except "none") */
2586
{
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2595
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
interface = NULL;
1930
2598
}
1931
2599
}
1932
2600
}
1933
2601
1934
2602
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
2603
{
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
2608
goto end;
2609
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1937
2615
}
1938
2616
1939
2617
if(not debug){
1940
2618
avahi_set_log_function(empty_log);
1941
2619
}
1942
2620
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
1964
goto end;
1965
}
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
1972
}
1973
}
1974
1975
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1976
2622
from the signal handler */
1977
2623
/* Initialize the pseudo-RNG for Avahi */
1978
2624
srand((unsigned int) time(NULL));
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
1981
2627
fprintf_plus(stderr,
1982
2628
"Avahi: Failed to create simple poll object.\n");
1983
2629
exitcode = EX_UNAVAILABLE;
2047
2693
}
2048
2694
}
2049
2695
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2701
alphasort);
2702
if(ret >= 1){
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2711
continue;
2712
}
2713
if(debug){
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2716
}
2717
free(direntries[i]);
2718
}
2719
free(direntries);
2720
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2726
goto end;
2727
}
2728
}
2729
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
2747
}
2748
}
2749
break;
2750
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2057
2779
}
2058
2780
2059
2781
if(quit_now){
2060
2782
goto end;
2061
2783
}
2062
2784
2063
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2064
2786
if(ret == -1){
2065
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2066
2788
exitcode = EX_UNAVAILABLE;
2073
2795
goto end;
2074
2796
}
2075
2797
2076
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2077
2808
perror_plus("mkdtemp");
2078
2809
goto end;
2079
2810
}
2080
tempdir_created = true;
2081
2811
2082
2812
if(quit_now){
2083
2813
goto end;
2084
2814
}
2085
2815
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2087
2817
fprintf_plus(stderr, "init_gpgme failed\n");
2088
2818
exitcode = EX_UNAVAILABLE;
2089
2819
goto end;
2110
2840
goto end;
2111
2841
}
2112
2842
2113
uint16_t port;
2843
in_port_t port;
2114
2844
errno = 0;
2115
2845
tmpmax = strtoimax(address+1, &tmp, 10);
2116
2846
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2117
or tmpmax != (uint16_t)tmpmax){
2847
or tmpmax != (in_port_t)tmpmax){
2118
2848
fprintf_plus(stderr, "Bad port number\n");
2119
2849
exitcode = EX_USAGE;
2120
2850
goto end;
2121
2851
}
2122
2852
2123
2853
if(quit_now){
2124
2854
goto end;
2125
2855
}
2126
2856
2127
port = (uint16_t)tmpmax;
2857
port = (in_port_t)tmpmax;
2128
2858
*address = '\0';
2129
2859
/* Colon in address indicates IPv6 */
2130
2860
int af;
2146
2876
}
2147
2877
2148
2878
while(not quit_now){
2149
ret = start_mandos_communication(address, port, if_index, af);
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
2150
2881
if(quit_now or ret == 0){
2151
2882
break;
2152
2883
}
2154
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
2886
(int)retry_interval);
2156
2887
}
2157
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2158
2889
}
2159
2890
2160
if (not quit_now){
2891
if(not quit_now){
2161
2892
exitcode = EXIT_SUCCESS;
2162
2893
}
2163
2894
2178
2909
config.publish_domain = 0;
2179
2910
2180
2911
/* Allocate a new server */
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2184
2914
2185
2915
/* Free the Avahi configuration data */
2186
2916
avahi_server_config_free(&config);
2189
2919
/* Check if creating the Avahi server object succeeded */
2190
2920
if(mc.server == NULL){
2191
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
2922
avahi_strerror(ret));
2193
2923
exitcode = EX_UNAVAILABLE;
2194
2924
goto end;
2195
2925
}
2201
2931
/* Create the Avahi service browser */
2202
2932
sb = avahi_s_service_browser_new(mc.server, if_index,
2203
2933
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2204
NULL, 0, browse_callback, NULL);
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2205
2936
if(sb == NULL){
2206
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
2938
avahi_strerror(avahi_server_errno(mc.server)));
2218
2949
if(debug){
2219
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2220
2951
}
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2224
2955
if(debug){
2225
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
2957
(ret == 0) ? "successfully" : "with error");
2229
2960
end:
2230
2961
2231
2962
if(debug){
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2233
2970
}
2234
2971
2235
2972
/* Cleanup things */
2973
free(mc.interfaces);
2974
2236
2975
if(sb != NULL)
2237
2976
avahi_s_service_browser_free(sb);
2238
2977
2239
2978
if(mc.server != NULL)
2240
2979
avahi_server_free(mc.server);
2241
2980
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2244
2983
2245
2984
if(gnutls_initialized){
2246
2985
gnutls_certificate_free_credentials(mc.cred);
2247
gnutls_global_deinit();
2248
2986
gnutls_dh_params_deinit(mc.dh_params);
2249
2987
}
2250
2988
2258
2996
mc.current_server->prev->next = NULL;
2259
2997
while(mc.current_server != NULL){
2260
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2261
3007
free(mc.current_server);
2262
3008
mc.current_server = next;
2263
3009
}
2264
3010
}
2265
3011
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
3012
/* Re-raise privileges */
2270
3013
{
2271
raise_privileges();
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
2272
3042
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
}
2284
}
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2288
}
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
2289
3047
}
2290
3048
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
3049
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
2296
3107
}
2297
3108
2298
3109
/* Removes the GPGME temp directory and all files inside */
2299
if(tempdir_created){
2300
struct dirent **direntries = NULL;
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
direntry->d_name);
2310
if(ret < 0){
2311
perror_plus("asprintf");
2312
continue;
2313
}
2314
ret = remove(fullname);
2315
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2318
}
2319
free(fullname);
2320
}
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
2327
}
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2331
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2332
3112
}
2333
3113
2334
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0