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- Committer: Teddy Hogeborn
- Date: 2018-02-18 01:14:23 UTC
- Revision ID: teddy@recompile.se-20180218011423-twxv4clb7wvm9fof
Remove dead code.
* plugins.d/mandos-client.d (main/clean_dir_at): Remove dead code.
* plugins.d/mandos-client.d (main/clean_dir_at): Remove dead code.
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 © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
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 <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,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
138
148
static const char sys_class_net[] = "/sys/class/net";
139
149
char *connect_to = NULL;
140
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
141
152
uid_t uid = 65534;
142
153
gid_t gid = 65534;
143
154
161
172
const char *priority;
162
173
gpgme_ctx_t ctx;
163
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
164
177
} mandos_context;
165
178
166
179
/* global so signal handler can reach it*/
167
180
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
181
172
182
sig_atomic_t quit_now = 0;
173
183
int signal_received = 0;
181
191
perror(print_text);
182
192
}
183
193
184
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
195
int fprintf_plus(FILE *stream, const char *format, ...){
186
196
va_list ap;
187
197
va_start (ap, format);
188
198
189
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
200
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
202
}
193
203
194
204
/*
196
206
* bytes. "buffer_capacity" is how much is currently allocated,
197
207
* "buffer_length" is how much is already used.
198
208
*/
209
__attribute__((nonnull, warn_unused_result))
199
210
size_t incbuffer(char **buffer, size_t buffer_length,
200
211
size_t buffer_capacity){
201
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
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;
204
219
return 0;
205
220
}
221
*buffer = new_buf;
206
222
buffer_capacity += BUFFER_SIZE;
207
223
}
208
224
return buffer_capacity;
209
225
}
210
226
211
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
212
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
230
int af, server **current_server){
214
231
int ret;
215
232
server *new_server = malloc(sizeof(server));
216
233
if(new_server == NULL){
223
240
.af = af };
224
241
if(new_server->ip == NULL){
225
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);
226
258
return false;
227
259
}
228
260
/* Special case of first server */
229
if (mc.current_server == NULL){
261
if(*current_server == NULL){
230
262
new_server->next = new_server;
231
263
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
264
*current_server = new_server;
234
265
} else {
235
new_server->next = mc.current_server;
236
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;
237
269
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
270
(*current_server)->prev = new_server;
244
271
}
245
272
return true;
246
273
}
248
275
/*
249
276
* Initialize GPGME.
250
277
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
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){
253
283
gpgme_error_t rc;
254
284
gpgme_engine_info_t engine_info;
255
285
256
286
/*
257
287
* Helper function to insert pub and seckey to the engine keyring.
258
288
*/
259
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
260
290
int ret;
261
291
int fd;
262
292
gpgme_data_t pgp_data;
274
304
return false;
275
305
}
276
306
277
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
278
308
if(rc != GPG_ERR_NO_ERROR){
279
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
310
gpgme_strsource(rc), gpgme_strerror(rc));
281
311
return false;
282
312
}
283
313
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
285
315
if(ret == -1){
286
316
perror_plus("close");
287
317
}
324
354
}
325
355
326
356
/* Create new GPGME "context" */
327
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
328
358
if(rc != GPG_ERR_NO_ERROR){
329
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
373
* Decrypt OpenPGP data.
344
374
* Returns -1 on error
345
375
*/
376
__attribute__((nonnull, warn_unused_result))
346
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
347
378
size_t crypto_size,
348
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
349
381
gpgme_data_t dh_crypto, dh_plain;
350
382
gpgme_error_t rc;
351
383
ssize_t ret;
377
409
378
410
/* Decrypt data from the cryptotext data buffer to the plaintext
379
411
data buffer */
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
413
if(rc != GPG_ERR_NO_ERROR){
382
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
415
gpgme_strsource(rc), gpgme_strerror(rc));
384
416
plaintext_length = -1;
385
417
if(debug){
386
418
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
388
420
if(result == NULL){
389
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
422
} else {
467
499
return plaintext_length;
468
500
}
469
501
470
static const char * safer_gnutls_strerror(int value){
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){
471
511
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
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 */
1040
__attribute__((nonnull, warn_unused_result))
622
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
}
667
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);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1158
if(if_index == AVAHI_IF_UNSPEC){
709
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1160
" incomplete without a network interface\n");
712
1162
goto mandos_end;
713
1163
}
714
1164
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1166
}
717
1167
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1169
}
722
1170
723
1171
if(quit_now){
740
1188
}
741
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
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;
782
1271
}
783
1272
784
1273
const char *out = mandos_protocol_version;
935
1424
if(buffer_length > 0){
936
1425
ssize_t decrypted_buffer_size;
937
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
1427
&decrypted_buffer, mc);
939
1428
if(decrypted_buffer_size >= 0){
940
1429
1430
clearerr(stdout);
941
1431
written = 0;
942
1432
while(written < (size_t) decrypted_buffer_size){
943
1433
if(quit_now){
959
1449
}
960
1450
written += (size_t)ret;
961
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
}
962
1462
retval = 0;
963
1463
}
964
1464
}
967
1467
968
1468
mandos_end:
969
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
}
970
1476
int e = errno;
971
1477
free(decrypted_buffer);
972
1478
free(buffer);
973
1479
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
ret = close(tcp_sd);
975
1481
}
976
1482
if(ret == -1){
977
1483
if(e == 0){
1002
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1510
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1511
void *mc){
1006
1512
if(r == NULL){
1007
1513
return;
1008
1514
}
1011
1517
timed out */
1012
1518
1013
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1014
1521
return;
1015
1522
}
1016
1523
1020
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1529
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1024
1532
break;
1025
1533
1026
1534
case AVAHI_RESOLVER_FOUND:
1034
1542
}
1035
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
1544
interface,
1037
avahi_proto_to_af(proto));
1545
avahi_proto_to_af(proto),
1546
mc);
1038
1547
if(ret == 0){
1039
1548
avahi_simple_poll_quit(simple_poll);
1040
1549
} else {
1041
1550
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
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){
1571
void *mc){
1062
1572
if(b == NULL){
1063
1573
return;
1064
1574
}
1075
1585
case AVAHI_BROWSER_FAILURE:
1076
1586
1077
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1079
1590
avahi_simple_poll_quit(simple_poll);
1080
1591
return;
1081
1592
1085
1596
the callback function is called the Avahi server will free the
1086
1597
resolver for us. */
1087
1598
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
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)
1091
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
1604
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1094
1607
break;
1095
1608
1096
1609
case AVAHI_BROWSER_REMOVE:
1121
1634
errno = old_errno;
1122
1635
}
1123
1636
1637
__attribute__((nonnull, warn_unused_result))
1124
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
1639
int ret;
1126
error_t ret_errno;
1640
int old_errno;
1127
1641
1128
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
1643
if(s < 0){
1130
ret_errno = errno;
1644
old_errno = errno;
1131
1645
perror_plus("socket");
1132
errno = ret_errno;
1646
errno = old_errno;
1133
1647
return false;
1134
1648
}
1135
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1136
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
1652
if(ret == -1){
1138
1653
if(debug){
1139
ret_errno = errno;
1654
old_errno = errno;
1140
1655
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1656
errno = old_errno;
1142
1657
}
1143
1658
return false;
1144
1659
}
1145
1660
return true;
1146
1661
}
1147
1662
1663
__attribute__((nonnull, warn_unused_result))
1148
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1665
1150
1666
/* Reject the loopback device */
1192
1708
* corresponds to an acceptable network device.
1193
1709
* (This function is passed to scandir(3) as a filter function.)
1194
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1195
1712
int good_interface(const struct dirent *if_entry){
1196
1713
if(if_entry->d_name[0] == '.'){
1197
1714
return 0;
1215
1732
/*
1216
1733
* This function determines if a network interface is up.
1217
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1218
1736
bool interface_is_up(const char *interface){
1219
1737
struct ifreq ifr;
1220
1738
if(not get_flags(interface, &ifr)){
1231
1749
/*
1232
1750
* This function determines if a network interface is running
1233
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1234
1753
bool interface_is_running(const char *interface){
1235
1754
struct ifreq ifr;
1236
1755
if(not get_flags(interface, &ifr)){
1244
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1764
}
1246
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1247
1767
int notdotentries(const struct dirent *direntry){
1248
1768
/* Skip "." and ".." */
1249
1769
if(direntry->d_name[0] == '.'
1256
1776
}
1257
1777
1258
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1259
1780
int runnable_hook(const struct dirent *direntry){
1260
1781
int ret;
1261
1782
size_t sret;
1269
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1791
"abcdefghijklmnopqrstuvwxyz"
1271
1792
"0123456789"
1272
"_-");
1793
"_.-");
1273
1794
if((direntry->d_name)[sret] != '\0'){
1274
1795
/* Contains non-allowed characters */
1275
1796
if(debug){
1279
1800
return 0;
1280
1801
}
1281
1802
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1804
if(ret == -1){
1291
1805
if(debug){
1292
1806
perror_plus("Could not stat hook");
1316
1830
return 1;
1317
1831
}
1318
1832
1319
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){
1320
1836
int ret;
1321
1837
struct timespec now;
1322
1838
struct timespec waited_time;
1323
1839
intmax_t block_time;
1324
1840
1325
1841
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1842
if(mc->current_server == NULL){
1843
if(debug){
1328
1844
fprintf_plus(stderr, "Wait until first server is found."
1329
1845
" No timeout!\n");
1330
1846
}
1331
1847
ret = avahi_simple_poll_iterate(s, -1);
1332
1848
} else {
1333
if (debug){
1849
if(debug){
1334
1850
fprintf_plus(stderr, "Check current_server if we should run"
1335
1851
" it, or wait\n");
1336
1852
}
1343
1859
/* Calculating in ms how long time between now and server
1344
1860
who we visted longest time ago. Now - last seen. */
1345
1861
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1347
1863
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1349
1865
/* total time is 10s/10,000ms.
1350
1866
Converting to s from ms by dividing by 1,000,
1351
1867
and ns to ms by dividing by 1,000,000. */
1353
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1354
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1871
1356
if (debug){
1872
if(debug){
1357
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
1874
block_time);
1359
1875
}
1360
1876
1361
1877
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
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);
1366
1882
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1883
avahi_simple_poll_quit(s);
1368
1884
return 0;
1369
1885
}
1370
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1372
1888
if(ret == -1){
1373
1889
perror_plus("clock_gettime");
1374
1890
return -1;
1375
1891
}
1376
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1377
1893
block_time = 0; /* Call avahi to find new Mandos
1378
1894
servers, but don't block */
1379
1895
}
1381
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
1898
}
1383
1899
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1385
1901
return (ret != 1) ? ret : 0;
1386
1902
}
1387
1903
}
1388
1904
}
1389
1905
}
1390
1906
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1444
1909
const float delay){
1445
struct dirent **direntries;
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 devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1927
if(devnull == -1){
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1929
return;
1930
}
1931
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1932
runnable_hook, alphasort);
1933
if(numhooks == -1){
1934
perror_plus("scandir");
1935
close(devnull);
1936
return;
1937
}
1446
1938
struct dirent *direntry;
1447
1939
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1458
1945
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1466
1992
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1525
1997
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
1537
2066
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
1574
2086
}
1575
2087
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
2088
__attribute__((nonnull, warn_unused_result))
2089
int bring_up_interface(const char *const interface,
2090
const float delay){
2091
int old_errno = errno;
2092
int ret;
1582
2093
struct ifreq network;
1583
2094
unsigned int if_index = if_nametoindex(interface);
1584
2095
if(if_index == 0){
1593
2104
}
1594
2105
1595
2106
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2107
int ret_errno = 0;
2108
int ioctl_errno = 0;
2109
if(not get_flags(interface, &network)){
1597
2110
ret_errno = errno;
1598
2111
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2112
"\"%s\"\n", interface);
2113
errno = old_errno;
1600
2114
return ret_errno;
1601
2115
}
1602
network.ifr_flags |= IFF_UP;
2116
network.ifr_flags |= IFF_UP; /* set flag */
1603
2117
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2118
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2119
if(sd == -1){
1606
2120
ret_errno = errno;
1607
2121
perror_plus("socket");
1608
2122
errno = old_errno;
1609
2123
return ret_errno;
1610
2124
}
1611
2125
1612
2126
if(quit_now){
1613
close(sd);
2127
ret = close(sd);
2128
if(ret == -1){
2129
perror_plus("close");
2130
}
1614
2131
errno = old_errno;
1615
2132
return EINTR;
1616
2133
}
1620
2137
interface);
1621
2138
}
1622
2139
1623
/* Raise priviliges */
1624
raise_privileges();
2140
/* Raise privileges */
2141
ret_errno = raise_privileges();
2142
if(ret_errno != 0){
2143
errno = ret_errno;
2144
perror_plus("Failed to raise privileges");
2145
}
1625
2146
1626
2147
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
2148
int ret_linux;
2149
bool restore_loglevel = false;
2150
if(ret_errno == 0){
2151
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2152
messages about the network interface to mess up the prompt */
2153
ret_linux = klogctl(8, NULL, 5);
2154
if(ret_linux == -1){
2155
perror_plus("klogctl");
2156
} else {
2157
restore_loglevel = true;
2158
}
1634
2159
}
1635
2160
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2161
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2162
ioctl_errno = errno;
1638
2163
#ifdef __linux__
1639
2164
if(restore_loglevel){
1640
2165
ret_linux = klogctl(7, NULL, 0);
1644
2169
}
1645
2170
#endif /* __linux__ */
1646
2171
1647
/* Lower privileges */
1648
lower_privileges();
2172
/* If raise_privileges() succeeded above */
2173
if(ret_errno == 0){
2174
/* Lower privileges */
2175
ret_errno = lower_privileges();
2176
if(ret_errno != 0){
2177
errno = ret_errno;
2178
perror_plus("Failed to lower privileges");
2179
}
2180
}
1649
2181
1650
2182
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
ret = close(sd);
1652
2184
if(ret == -1){
1653
2185
perror_plus("close");
1654
2186
}
1655
2187
1656
2188
if(ret_setflags == -1){
1657
errno = ret_errno;
2189
errno = ioctl_errno;
1658
2190
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2191
errno = old_errno;
1660
return ret_errno;
2192
return ioctl_errno;
1661
2193
}
1662
2194
} else if(debug){
1663
2195
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
2198
1667
2199
/* Sleep checking until interface is running.
1668
2200
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
2201
for(int i = 0; i < delay * 4; i++){
1670
2202
if(interface_is_running(interface)){
1671
2203
break;
1672
2204
}
1681
2213
return 0;
1682
2214
}
1683
2215
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
2216
__attribute__((nonnull, warn_unused_result))
2217
int take_down_interface(const char *const interface){
2218
int old_errno = errno;
1689
2219
struct ifreq network;
1690
2220
unsigned int if_index = if_nametoindex(interface);
1691
2221
if(if_index == 0){
1694
2224
return ENXIO;
1695
2225
}
1696
2226
if(interface_is_up(interface)){
2227
int ret_errno = 0;
2228
int ioctl_errno = 0;
1697
2229
if(not get_flags(interface, &network) and debug){
1698
2230
ret_errno = errno;
1699
2231
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2232
"\"%s\"\n", interface);
2233
errno = old_errno;
1701
2234
return ret_errno;
1702
2235
}
1703
2236
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2237
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2238
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2239
if(sd == -1){
1707
2240
ret_errno = errno;
1708
2241
perror_plus("socket");
1709
2242
errno = old_errno;
1715
2248
interface);
1716
2249
}
1717
2250
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
2251
/* Raise privileges */
2252
ret_errno = raise_privileges();
2253
if(ret_errno != 0){
2254
errno = ret_errno;
2255
perror_plus("Failed to raise privileges");
2256
}
2257
2258
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2259
ioctl_errno = errno;
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
1726
2270
1727
2271
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
int ret = close(sd);
1729
2273
if(ret == -1){
1730
2274
perror_plus("close");
1731
2275
}
1732
2276
1733
2277
if(ret_setflags == -1){
1734
errno = ret_errno;
2278
errno = ioctl_errno;
1735
2279
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2280
errno = old_errno;
1737
return ret_errno;
2281
return ioctl_errno;
1738
2282
}
1739
2283
} else if(debug){
1740
2284
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2290
}
1747
2291
1748
2292
int main(int argc, char *argv[]){
2293
mandos_context mc = { .server = NULL, .dh_bits = 0,
2294
.priority = "SECURE256:!CTYPE-X.509"
2295
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2296
.current_server = NULL, .interfaces = NULL,
2297
.interfaces_size = 0 };
1749
2298
AvahiSServiceBrowser *sb = NULL;
1750
2299
error_t ret_errno;
1751
2300
int ret;
1752
2301
intmax_t tmpmax;
1753
2302
char *tmp;
1754
2303
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2304
char *interfaces_to_take_down = NULL;
1758
2305
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2306
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2307
char old_tempdir[] = "/tmp/mandosXXXXXX";
2308
char *tempdir = NULL;
1761
2309
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2310
const char *seckey = PATHDIR "/" SECKEY;
1763
2311
const char *pubkey = PATHDIR "/" PUBKEY;
2312
const char *dh_params_file = NULL;
1764
2313
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2314
1767
2315
bool gnutls_initialized = false;
1768
2316
bool gpgme_initialized = false;
1820
2368
.doc = "Bit length of the prime number used in the"
1821
2369
" Diffie-Hellman key exchange",
1822
2370
.group = 2 },
2371
{ .name = "dh-params", .key = 134,
2372
.arg = "FILE",
2373
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2374
" for the Diffie-Hellman key exchange",
2375
.group = 2 },
1823
2376
{ .name = "priority", .key = 130,
1824
2377
.arg = "STRING",
1825
2378
.doc = "GnuTLS priority string for the TLS handshake",
1859
2412
connect_to = arg;
1860
2413
break;
1861
2414
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2415
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2416
arg, (int)',');
1864
2417
if(ret_errno != 0){
1865
2418
argp_error(state, "%s", strerror(ret_errno));
1866
2419
}
1880
2433
}
1881
2434
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2435
break;
2436
case 134: /* --dh-params */
2437
dh_params_file = arg;
2438
break;
1883
2439
case 130: /* --priority */
1884
2440
mc.priority = arg;
1885
2441
break;
1925
2481
.args_doc = "",
1926
2482
.doc = "Mandos client -- Get and decrypt"
1927
2483
" passwords from a Mandos server" };
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
2484
ret_errno = argp_parse(&argp, argc, argv,
2485
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
switch(ret_errno){
1931
2487
case 0:
1932
2488
break;
1933
2489
case ENOMEM:
1934
2490
default:
1935
errno = ret;
2491
errno = ret_errno;
1936
2492
perror_plus("argp_parse");
1937
2493
exitcode = EX_OSERR;
1938
2494
goto end;
1941
2497
goto end;
1942
2498
}
1943
2499
}
1944
2500
1945
2501
{
1946
2502
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
2503
<https://bugs.debian.org/633582> */
1948
2504
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2505
/* Re-raise privileges */
2506
ret = raise_privileges();
2507
if(ret != 0){
2508
errno = ret;
2509
perror_plus("Failed to raise privileges");
2510
} else {
1951
2511
struct stat st;
1952
2512
1953
2513
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2527
}
1968
2528
}
1969
2529
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
close(seckey_fd);
1971
2531
}
1972
2532
}
1973
2533
1974
2534
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2535
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2536
if(pubkey_fd == -1){
1988
2548
}
1989
2549
}
1990
2550
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2551
close(pubkey_fd);
2552
}
2553
}
2554
2555
if(dh_params_file != NULL
2556
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2557
int dhparams_fd = open(dh_params_file, O_RDONLY);
2558
if(dhparams_fd == -1){
2559
perror_plus("open");
2560
} else {
2561
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2562
if(ret == -1){
2563
perror_plus("fstat");
2564
} else {
2565
if(S_ISREG(st.st_mode)
2566
and st.st_uid == 0 and st.st_gid == 0){
2567
ret = fchown(dhparams_fd, uid, gid);
2568
if(ret == -1){
2569
perror_plus("fchown");
2570
}
2571
}
2572
}
2573
close(dhparams_fd);
2574
}
2575
}
2576
1995
2577
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2578
ret = lower_privileges();
2579
if(ret != 0){
2580
errno = ret;
2581
perror_plus("Failed to lower privileges");
2000
2582
}
2001
2583
}
2002
2584
}
2003
2585
2004
/* Remove empty interface names */
2586
/* Remove invalid interface names (except "none") */
2005
2587
{
2006
2588
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2589
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2590
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2591
if(strcmp(interface, "none") != 0
2592
and if_nametoindex(interface) == 0){
2593
if(interface[0] != '\0'){
2011
2594
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2595
" \"%s\"\n", interface);
2013
2596
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2597
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2598
interface = NULL;
2016
2599
}
2017
2600
}
2019
2602
2020
2603
/* Run network hooks */
2021
2604
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2605
if(mc.interfaces != NULL){
2606
interfaces_hooks = malloc(mc.interfaces_size);
2025
2607
if(interfaces_hooks == NULL){
2026
2608
perror_plus("malloc");
2027
2609
goto end;
2028
2610
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2611
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2612
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2613
}
2614
run_network_hooks("start", interfaces_hooks != NULL ?
2615
interfaces_hooks : "", delay);
2038
2616
}
2039
2617
2040
2618
if(not debug){
2117
2695
}
2118
2696
2119
2697
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2698
if(mc.interfaces == NULL){
2699
struct dirent **direntries = NULL;
2122
2700
/* Look for any good interfaces */
2123
2701
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2702
alphasort);
2125
2703
if(ret >= 1){
2126
2704
/* Add all found interfaces to interfaces list */
2127
2705
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2706
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2707
direntries[i]->d_name);
2130
2708
if(ret_errno != 0){
2709
errno = ret_errno;
2131
2710
perror_plus("argz_add");
2711
free(direntries[i]);
2132
2712
continue;
2133
2713
}
2134
2714
if(debug){
2135
2715
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2716
direntries[i]->d_name);
2137
2717
}
2718
free(direntries[i]);
2138
2719
}
2139
2720
free(direntries);
2140
2721
} else {
2141
free(direntries);
2722
if(ret == 0){
2723
free(direntries);
2724
}
2142
2725
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2726
exitcode = EXIT_FAILURE;
2144
2727
goto end;
2145
2728
}
2146
2729
}
2147
2730
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2731
/* Bring up interfaces which are down, and remove any "none"s */
2732
{
2160
2733
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2734
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2735
interface))){
2736
/* If interface name is "none", stop bringing up interfaces.
2737
Also remove all instances of "none" from the list */
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
2742
while((interface = argz_next(mc.interfaces,
2743
mc.interfaces_size, interface))){
2744
if(strcmp(interface, "none") == 0){
2745
argz_delete(&mc.interfaces, &mc.interfaces_size,
2746
interface);
2747
interface = NULL;
2748
}
2749
}
2750
break;
2751
}
2163
2752
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2753
errno = bring_up_interface(interface, delay);
2165
2754
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2755
if(errno != 0){
2756
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2757
" %s\n", interface, strerror(errno));
2169
2758
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2759
errno = argz_add(&interfaces_to_take_down,
2760
&interfaces_to_take_down_size,
2761
interface);
2762
if(errno != 0){
2763
perror_plus("argz_add");
2764
}
2173
2765
}
2174
2766
}
2175
2767
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2768
if(debug and (interfaces_to_take_down == NULL)){
2180
2769
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2770
}
2182
2771
}
2183
2772
2773
/* If we only got one interface, explicitly use only that one */
2774
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2775
if(debug){
2776
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2777
mc.interfaces);
2778
}
2779
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2780
}
2781
2184
2782
if(quit_now){
2185
2783
goto end;
2186
2784
}
2187
2785
2188
ret = init_gnutls_global(pubkey, seckey);
2786
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2189
2787
if(ret == -1){
2190
2788
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
2789
exitcode = EX_UNAVAILABLE;
2198
2796
goto end;
2199
2797
}
2200
2798
2201
if(mkdtemp(tempdir) == NULL){
2799
/* Try /run/tmp before /tmp */
2800
tempdir = mkdtemp(run_tempdir);
2801
if(tempdir == NULL and errno == ENOENT){
2802
if(debug){
2803
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2804
run_tempdir, old_tempdir);
2805
}
2806
tempdir = mkdtemp(old_tempdir);
2807
}
2808
if(tempdir == NULL){
2202
2809
perror_plus("mkdtemp");
2203
2810
goto end;
2204
2811
}
2205
tempdir_created = true;
2206
2812
2207
2813
if(quit_now){
2208
2814
goto end;
2209
2815
}
2210
2816
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2817
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
2818
fprintf_plus(stderr, "init_gpgme failed\n");
2213
2819
exitcode = EX_UNAVAILABLE;
2214
2820
goto end;
2244
2850
exitcode = EX_USAGE;
2245
2851
goto end;
2246
2852
}
2247
2853
2248
2854
if(quit_now){
2249
2855
goto end;
2250
2856
}
2271
2877
}
2272
2878
2273
2879
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2880
ret = start_mandos_communication(address, port, if_index, af,
2881
&mc);
2275
2882
if(quit_now or ret == 0){
2276
2883
break;
2277
2884
}
2279
2886
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
2887
(int)retry_interval);
2281
2888
}
2282
sleep((int)retry_interval);
2889
sleep((unsigned int)retry_interval);
2283
2890
}
2284
2891
2285
if (not quit_now){
2892
if(not quit_now){
2286
2893
exitcode = EXIT_SUCCESS;
2287
2894
}
2288
2895
2304
2911
2305
2912
/* Allocate a new server */
2306
2913
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
2914
&config, NULL, NULL, &ret);
2308
2915
2309
2916
/* Free the Avahi configuration data */
2310
2917
avahi_server_config_free(&config);
2313
2920
/* Check if creating the Avahi server object succeeded */
2314
2921
if(mc.server == NULL){
2315
2922
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
2923
avahi_strerror(ret));
2317
2924
exitcode = EX_UNAVAILABLE;
2318
2925
goto end;
2319
2926
}
2325
2932
/* Create the Avahi service browser */
2326
2933
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
2934
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2935
NULL, 0, browse_callback,
2936
(void *)&mc);
2329
2937
if(sb == NULL){
2330
2938
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
2939
avahi_strerror(avahi_server_errno(mc.server)));
2342
2950
if(debug){
2343
2951
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
2952
}
2345
2953
2346
2954
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2955
(int)(retry_interval * 1000), &mc);
2348
2956
if(debug){
2349
2957
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
2958
(ret == 0) ? "successfully" : "with error");
2353
2961
end:
2354
2962
2355
2963
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2964
if(signal_received){
2965
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2966
argv[0], signal_received,
2967
strsignal(signal_received));
2968
} else {
2969
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
}
2357
2971
}
2358
2972
2359
2973
/* Cleanup things */
2974
free(mc.interfaces);
2975
2360
2976
if(sb != NULL)
2361
2977
avahi_s_service_browser_free(sb);
2362
2978
2368
2984
2369
2985
if(gnutls_initialized){
2370
2986
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2372
2987
gnutls_dh_params_deinit(mc.dh_params);
2373
2988
}
2374
2989
2382
2997
mc.current_server->prev->next = NULL;
2383
2998
while(mc.current_server != NULL){
2384
2999
server *next = mc.current_server->next;
3000
#ifdef __GNUC__
3001
#pragma GCC diagnostic push
3002
#pragma GCC diagnostic ignored "-Wcast-qual"
3003
#endif
3004
free((char *)(mc.current_server->ip));
3005
#ifdef __GNUC__
3006
#pragma GCC diagnostic pop
3007
#endif
2385
3008
free(mc.current_server);
2386
3009
mc.current_server = next;
2387
3010
}
2388
3011
}
2389
3012
2390
/* Re-raise priviliges */
3013
/* Re-raise privileges */
2391
3014
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
3015
ret = raise_privileges();
3016
if(ret != 0){
3017
errno = ret;
3018
perror_plus("Failed to raise privileges");
3019
} else {
3020
3021
/* Run network hooks */
3022
run_network_hooks("stop", interfaces_hooks != NULL ?
3023
interfaces_hooks : "", delay);
3024
3025
/* Take down the network interfaces which were brought up */
3026
{
3027
char *interface = NULL;
3028
while((interface = argz_next(interfaces_to_take_down,
3029
interfaces_to_take_down_size,
3030
interface))){
3031
ret = take_down_interface(interface);
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to take down interface");
3035
}
3036
}
3037
if(debug and (interfaces_to_take_down == NULL)){
3038
fprintf_plus(stderr, "No interfaces needed to be taken"
3039
" down\n");
3040
}
3041
}
3042
}
3043
3044
ret = lower_privileges_permanently();
3045
if(ret != 0){
3046
errno = ret;
3047
perror_plus("Failed to lower privileges permanently");
3048
}
2417
3049
}
2418
3050
2419
3051
free(interfaces_to_take_down);
2420
3052
free(interfaces_hooks);
2421
3053
3054
void clean_dir_at(int base, const char * const dirname,
3055
uintmax_t level){
3056
struct dirent **direntries = NULL;
3057
int dret;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3059
O_RDONLY
3060
| O_NOFOLLOW
3061
| O_DIRECTORY
3062
| O_PATH));
3063
if(dir_fd == -1){
3064
perror_plus("open");
3065
return;
3066
}
3067
int numentries = scandirat(dir_fd, ".", &direntries,
3068
notdotentries, alphasort);
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
if(debug){
3072
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3073
dirname, direntries[i]->d_name);
3074
}
3075
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3076
if(dret == -1){
3077
if(errno == EISDIR){
3078
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
AT_REMOVEDIR);
3080
}
3081
if((dret == -1) and (errno == ENOTEMPTY)
3082
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3083
== 0) and (level == 0)){
3084
/* Recurse only in this special case */
3085
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3086
dret = 0;
3087
}
3088
if((dret == -1) and (errno != ENOENT)){
3089
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3090
direntries[i]->d_name, strerror(errno));
3091
}
3092
}
3093
free(direntries[i]);
3094
}
3095
3096
/* need to clean even if 0 because man page doesn't specify */
3097
free(direntries);
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
2422
3108
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
2431
char *fullname = NULL;
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
direntry->d_name);
2434
if(ret < 0){
2435
perror_plus("asprintf");
2436
continue;
2437
}
2438
ret = remove(fullname);
2439
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
2442
}
2443
free(fullname);
2444
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
2451
}
2452
ret = rmdir(tempdir);
2453
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
2455
}
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2456
3111
}
2457
3112
2458
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0