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- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:50:12 UTC
- Revision ID: teddy@recompile.se-20180222185012-etchk537ast7s1xg
Tags: version-1.7.19-1
* Makefile (version): Change to 1.7.19.
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
* NEWS (Version 1.7.19): Add new entry.
* debian/changelog (1.7.19-1): - '' -
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
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
755
551
756
return 0;
552
757
553
758
globalfail:
554
759
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
760
gnutls_certificate_free_credentials(mc->cred);
761
gnutls_dh_params_deinit(mc->dh_params);
558
762
return -1;
559
763
}
560
764
561
static int init_gnutls_session(gnutls_session_t *session){
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
767
mandos_context *mc){
562
768
int ret;
563
769
/* GnuTLS session creation */
564
770
do {
576
782
{
577
783
const char *err;
578
784
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
785
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
786
if(quit_now){
581
787
gnutls_deinit(*session);
582
788
return -1;
593
799
594
800
do {
595
801
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
802
mc->cred);
597
803
if(quit_now){
598
804
gnutls_deinit(*session);
599
805
return -1;
609
815
/* ignore client certificate if any. */
610
816
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
817
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
818
return 0;
615
819
}
616
820
618
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
823
__attribute__((unused)) const char *txt){}
620
824
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
621
1043
/* Called when a Mandos server is found */
1044
__attribute__((nonnull, warn_unused_result))
622
1045
static int start_mandos_communication(const char *ip, in_port_t port,
623
1046
AvahiIfIndex if_index,
624
int af){
1047
int af, mandos_context *mc){
625
1048
int ret, tcp_sd = -1;
626
1049
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1050
struct sockaddr_storage to;
631
1051
char *buffer = NULL;
632
1052
char *decrypted_buffer = NULL;
633
1053
size_t buffer_length = 0;
636
1056
int retval = -1;
637
1057
gnutls_session_t session;
638
1058
int pf; /* Protocol family */
1059
bool route_added = false;
639
1060
640
1061
errno = 0;
641
1062
657
1078
return -1;
658
1079
}
659
1080
660
ret = init_gnutls_session(&session);
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1084
bool match = false;
1085
{
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
match = true;
1092
break;
1093
}
1094
}
1095
}
1096
if(not match){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1099
if(debug){
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1103
} else {
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1105
" \"%s\"\n",
1106
if_indextoname((unsigned int)if_index,
1107
interface));
1108
}
1109
}
1110
return -1;
1111
}
1112
}
1113
1114
ret = init_gnutls_session(&session, mc);
661
1115
if(ret != 0){
662
1116
return -1;
663
1117
}
667
1121
PRIuMAX "\n", ip, (uintmax_t)port);
668
1122
}
669
1123
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1125
if(tcp_sd < 0){
672
1126
int e = errno;
673
1127
perror_plus("socket");
680
1134
goto mandos_end;
681
1135
}
682
1136
683
memset(&to, 0, sizeof(to));
684
1137
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1141
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
690
1145
}
691
1146
if(ret < 0 ){
692
1147
int e = errno;
701
1156
goto mandos_end;
702
1157
}
703
1158
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*/
1159
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1160
if(IN6_IS_ADDR_LINKLOCAL
1161
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1162
if(if_index == AVAHI_IF_UNSPEC){
709
1163
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1164
" incomplete without a network interface\n");
712
1166
goto mandos_end;
713
1167
}
714
1168
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1170
}
717
1171
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1172
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1173
}
722
1174
723
1175
if(quit_now){
740
1192
}
741
1193
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1194
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;
1195
if(af == AF_INET6){
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
} else {
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1204
NI_NUMERICHOST);
1205
}
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1212
}
1213
}
1214
1215
if(quit_now){
1216
errno = EINTR;
1217
goto mandos_end;
1218
}
1219
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
782
1275
}
783
1276
784
1277
const char *out = mandos_protocol_version;
935
1428
if(buffer_length > 0){
936
1429
ssize_t decrypted_buffer_size;
937
1430
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
1431
&decrypted_buffer, mc);
939
1432
if(decrypted_buffer_size >= 0){
940
1433
1434
clearerr(stdout);
941
1435
written = 0;
942
1436
while(written < (size_t) decrypted_buffer_size){
943
1437
if(quit_now){
959
1453
}
960
1454
written += (size_t)ret;
961
1455
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
962
1466
retval = 0;
963
1467
}
964
1468
}
967
1471
968
1472
mandos_end:
969
1473
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
970
1480
int e = errno;
971
1481
free(decrypted_buffer);
972
1482
free(buffer);
973
1483
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1484
ret = close(tcp_sd);
975
1485
}
976
1486
if(ret == -1){
977
1487
if(e == 0){
1002
1512
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1513
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1514
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1515
void *mc){
1006
1516
if(r == NULL){
1007
1517
return;
1008
1518
}
1011
1521
timed out */
1012
1522
1013
1523
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1014
1525
return;
1015
1526
}
1016
1527
1020
1531
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1532
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1533
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
1534
avahi_strerror(avahi_server_errno
1535
(((mandos_context*)mc)->server)));
1024
1536
break;
1025
1537
1026
1538
case AVAHI_RESOLVER_FOUND:
1034
1546
}
1035
1547
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
1548
interface,
1037
avahi_proto_to_af(proto));
1549
avahi_proto_to_af(proto),
1550
mc);
1038
1551
if(ret == 0){
1039
1552
avahi_simple_poll_quit(simple_poll);
1040
1553
} else {
1041
1554
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1555
avahi_proto_to_af(proto),
1556
&((mandos_context*)mc)->current_server)){
1043
1557
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1558
" list\n", name);
1045
1559
}
1058
1572
const char *domain,
1059
1573
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1574
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1575
void *mc){
1062
1576
if(b == NULL){
1063
1577
return;
1064
1578
}
1075
1589
case AVAHI_BROWSER_FAILURE:
1076
1590
1077
1591
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1592
avahi_strerror(avahi_server_errno
1593
(((mandos_context*)mc)->server)));
1079
1594
avahi_simple_poll_quit(simple_poll);
1080
1595
return;
1081
1596
1085
1600
the callback function is called the Avahi server will free the
1086
1601
resolver for us. */
1087
1602
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
1603
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1604
interface, protocol, name, type,
1605
domain, protocol, 0,
1606
resolve_callback, mc) == NULL)
1091
1607
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
1608
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
1094
1611
break;
1095
1612
1096
1613
case AVAHI_BROWSER_REMOVE:
1121
1638
errno = old_errno;
1122
1639
}
1123
1640
1641
__attribute__((nonnull, warn_unused_result))
1124
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
1643
int ret;
1126
error_t ret_errno;
1644
int old_errno;
1127
1645
1128
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
1647
if(s < 0){
1130
ret_errno = errno;
1648
old_errno = errno;
1131
1649
perror_plus("socket");
1132
errno = ret_errno;
1650
errno = old_errno;
1133
1651
return false;
1134
1652
}
1135
strcpy(ifr->ifr_name, ifname);
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1136
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
1656
if(ret == -1){
1138
1657
if(debug){
1139
ret_errno = errno;
1658
old_errno = errno;
1140
1659
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1142
1666
}
1143
1667
return false;
1144
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1145
1674
return true;
1146
1675
}
1147
1676
1677
__attribute__((nonnull, warn_unused_result))
1148
1678
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1679
1150
1680
/* Reject the loopback device */
1192
1722
* corresponds to an acceptable network device.
1193
1723
* (This function is passed to scandir(3) as a filter function.)
1194
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1195
1726
int good_interface(const struct dirent *if_entry){
1196
1727
if(if_entry->d_name[0] == '.'){
1197
1728
return 0;
1215
1746
/*
1216
1747
* This function determines if a network interface is up.
1217
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1218
1750
bool interface_is_up(const char *interface){
1219
1751
struct ifreq ifr;
1220
1752
if(not get_flags(interface, &ifr)){
1231
1763
/*
1232
1764
* This function determines if a network interface is running
1233
1765
*/
1766
__attribute__((nonnull, warn_unused_result))
1234
1767
bool interface_is_running(const char *interface){
1235
1768
struct ifreq ifr;
1236
1769
if(not get_flags(interface, &ifr)){
1244
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1778
}
1246
1779
1780
__attribute__((nonnull, pure, warn_unused_result))
1247
1781
int notdotentries(const struct dirent *direntry){
1248
1782
/* Skip "." and ".." */
1249
1783
if(direntry->d_name[0] == '.'
1256
1790
}
1257
1791
1258
1792
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1259
1794
int runnable_hook(const struct dirent *direntry){
1260
1795
int ret;
1261
1796
size_t sret;
1269
1804
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1805
"abcdefghijklmnopqrstuvwxyz"
1271
1806
"0123456789"
1272
"_-");
1807
"_.-");
1273
1808
if((direntry->d_name)[sret] != '\0'){
1274
1809
/* Contains non-allowed characters */
1275
1810
if(debug){
1279
1814
return 0;
1280
1815
}
1281
1816
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);
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1818
if(ret == -1){
1291
1819
if(debug){
1292
1820
perror_plus("Could not stat hook");
1316
1844
return 1;
1317
1845
}
1318
1846
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1847
__attribute__((nonnull, warn_unused_result))
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
mandos_context *mc){
1320
1850
int ret;
1321
1851
struct timespec now;
1322
1852
struct timespec waited_time;
1323
1853
intmax_t block_time;
1324
1854
1325
1855
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1856
if(mc->current_server == NULL){
1857
if(debug){
1328
1858
fprintf_plus(stderr, "Wait until first server is found."
1329
1859
" No timeout!\n");
1330
1860
}
1331
1861
ret = avahi_simple_poll_iterate(s, -1);
1332
1862
} else {
1333
if (debug){
1863
if(debug){
1334
1864
fprintf_plus(stderr, "Check current_server if we should run"
1335
1865
" it, or wait\n");
1336
1866
}
1343
1873
/* Calculating in ms how long time between now and server
1344
1874
who we visted longest time ago. Now - last seen. */
1345
1875
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1876
- mc->current_server->last_seen.tv_sec);
1347
1877
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1878
- mc->current_server->last_seen.tv_nsec);
1349
1879
/* total time is 10s/10,000ms.
1350
1880
Converting to s from ms by dividing by 1,000,
1351
1881
and ns to ms by dividing by 1,000,000. */
1353
1883
- ((intmax_t)waited_time.tv_sec * 1000))
1354
1884
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1885
1356
if (debug){
1886
if(debug){
1357
1887
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
1888
block_time);
1359
1889
}
1360
1890
1361
1891
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);
1892
ret = start_mandos_communication(mc->current_server->ip,
1893
mc->current_server->port,
1894
mc->current_server->if_index,
1895
mc->current_server->af, mc);
1366
1896
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1897
avahi_simple_poll_quit(s);
1368
1898
return 0;
1369
1899
}
1370
1900
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1901
&mc->current_server->last_seen);
1372
1902
if(ret == -1){
1373
1903
perror_plus("clock_gettime");
1374
1904
return -1;
1375
1905
}
1376
mc.current_server = mc.current_server->next;
1906
mc->current_server = mc->current_server->next;
1377
1907
block_time = 0; /* Call avahi to find new Mandos
1378
1908
servers, but don't block */
1379
1909
}
1381
1911
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
1912
}
1383
1913
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1914
if(ret > 0 or errno != EINTR){
1385
1915
return (ret != 1) ? ret : 0;
1386
1916
}
1387
1917
}
1388
1918
}
1389
1919
}
1390
1920
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,
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1444
1923
const float delay){
1445
struct dirent **direntries;
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1947
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1446
1952
struct dirent *direntry;
1447
1953
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");
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1458
1959
}
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){
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
1466
2006
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
}
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
1525
2011
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
}
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
1537
2080
} 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;
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
1574
2100
}
1575
2101
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;
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2106
int ret;
1582
2107
struct ifreq network;
1583
2108
unsigned int if_index = if_nametoindex(interface);
1584
2109
if(if_index == 0){
1593
2118
}
1594
2119
1595
2120
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
1597
2124
ret_errno = errno;
1598
2125
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2126
"\"%s\"\n", interface);
2127
errno = old_errno;
1600
2128
return ret_errno;
1601
2129
}
1602
network.ifr_flags |= IFF_UP;
2130
network.ifr_flags |= IFF_UP; /* set flag */
1603
2131
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2133
if(sd == -1){
1606
2134
ret_errno = errno;
1607
2135
perror_plus("socket");
1608
2136
errno = old_errno;
1609
2137
return ret_errno;
1610
2138
}
1611
2139
1612
2140
if(quit_now){
1613
close(sd);
2141
ret = close(sd);
2142
if(ret == -1){
2143
perror_plus("close");
2144
}
1614
2145
errno = old_errno;
1615
2146
return EINTR;
1616
2147
}
1620
2151
interface);
1621
2152
}
1622
2153
1623
/* Raise priviliges */
1624
raise_privileges();
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to raise privileges");
2159
}
1625
2160
1626
2161
#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");
2162
int ret_linux;
2163
bool restore_loglevel = false;
2164
if(ret_errno == 0){
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2170
} else {
2171
restore_loglevel = true;
2172
}
1634
2173
}
1635
2174
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
1638
2177
#ifdef __linux__
1639
2178
if(restore_loglevel){
1640
2179
ret_linux = klogctl(7, NULL, 0);
1644
2183
}
1645
2184
#endif /* __linux__ */
1646
2185
1647
/* Lower privileges */
1648
lower_privileges();
2186
/* If raise_privileges() succeeded above */
2187
if(ret_errno == 0){
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2190
if(ret_errno != 0){
2191
errno = ret_errno;
2192
perror_plus("Failed to lower privileges");
2193
}
2194
}
1649
2195
1650
2196
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2197
ret = close(sd);
1652
2198
if(ret == -1){
1653
2199
perror_plus("close");
1654
2200
}
1655
2201
1656
2202
if(ret_setflags == -1){
1657
errno = ret_errno;
2203
errno = ioctl_errno;
1658
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2205
errno = old_errno;
1660
return ret_errno;
2206
return ioctl_errno;
1661
2207
}
1662
2208
} else if(debug){
1663
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
2212
1667
2213
/* Sleep checking until interface is running.
1668
2214
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
1670
2216
if(interface_is_running(interface)){
1671
2217
break;
1672
2218
}
1681
2227
return 0;
1682
2228
}
1683
2229
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;
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1689
2233
struct ifreq network;
1690
2234
unsigned int if_index = if_nametoindex(interface);
1691
2235
if(if_index == 0){
1694
2238
return ENXIO;
1695
2239
}
1696
2240
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1697
2243
if(not get_flags(interface, &network) and debug){
1698
2244
ret_errno = errno;
1699
2245
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2246
"\"%s\"\n", interface);
2247
errno = old_errno;
1701
2248
return ret_errno;
1702
2249
}
1703
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2251
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2253
if(sd == -1){
1707
2254
ret_errno = errno;
1708
2255
perror_plus("socket");
1709
2256
errno = old_errno;
1715
2262
interface);
1716
2263
}
1717
2264
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();
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2267
if(ret_errno != 0){
2268
errno = ret_errno;
2269
perror_plus("Failed to raise privileges");
2270
}
2271
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2274
2275
/* If raise_privileges() succeeded above */
2276
if(ret_errno == 0){
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2279
if(ret_errno != 0){
2280
errno = ret_errno;
2281
perror_plus("Failed to lower privileges");
2282
}
2283
}
1726
2284
1727
2285
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
int ret = close(sd);
1729
2287
if(ret == -1){
1730
2288
perror_plus("close");
1731
2289
}
1732
2290
1733
2291
if(ret_setflags == -1){
1734
errno = ret_errno;
2292
errno = ioctl_errno;
1735
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2294
errno = old_errno;
1737
return ret_errno;
2295
return ioctl_errno;
1738
2296
}
1739
2297
} else if(debug){
1740
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2304
}
1747
2305
1748
2306
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1749
2312
AvahiSServiceBrowser *sb = NULL;
1750
2313
error_t ret_errno;
1751
2314
int ret;
1752
2315
intmax_t tmpmax;
1753
2316
char *tmp;
1754
2317
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2318
char *interfaces_to_take_down = NULL;
1758
2319
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1761
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2324
const char *seckey = PATHDIR "/" SECKEY;
1763
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
1764
2327
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2328
1767
2329
bool gnutls_initialized = false;
1768
2330
bool gpgme_initialized = false;
1820
2382
.doc = "Bit length of the prime number used in the"
1821
2383
" Diffie-Hellman key exchange",
1822
2384
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
1823
2390
{ .name = "priority", .key = 130,
1824
2391
.arg = "STRING",
1825
2392
.doc = "GnuTLS priority string for the TLS handshake",
1859
2426
connect_to = arg;
1860
2427
break;
1861
2428
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2429
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2430
arg, (int)',');
1864
2431
if(ret_errno != 0){
1865
2432
argp_error(state, "%s", strerror(ret_errno));
1866
2433
}
1880
2447
}
1881
2448
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2449
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
1883
2453
case 130: /* --priority */
1884
2454
mc.priority = arg;
1885
2455
break;
1925
2495
.args_doc = "",
1926
2496
.doc = "Mandos client -- Get and decrypt"
1927
2497
" passwords from a Mandos server" };
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
1931
2501
case 0:
1932
2502
break;
1933
2503
case ENOMEM:
1934
2504
default:
1935
errno = ret;
2505
errno = ret_errno;
1936
2506
perror_plus("argp_parse");
1937
2507
exitcode = EX_OSERR;
1938
2508
goto end;
1941
2511
goto end;
1942
2512
}
1943
2513
}
1944
2514
1945
2515
{
1946
2516
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
1948
2518
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2523
perror_plus("Failed to raise privileges");
2524
} else {
1951
2525
struct stat st;
1952
2526
1953
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2541
}
1968
2542
}
1969
2543
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2544
close(seckey_fd);
1971
2545
}
1972
2546
}
1973
2547
1974
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2549
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2550
if(pubkey_fd == -1){
1988
2562
}
1989
2563
}
1990
2564
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
1995
2591
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to lower privileges");
2000
2596
}
2001
2597
}
2002
2598
}
2003
2599
2004
/* Remove empty interface names */
2600
/* Remove invalid interface names (except "none") */
2005
2601
{
2006
2602
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2604
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2011
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2609
" \"%s\"\n", interface);
2013
2610
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2612
interface = NULL;
2016
2613
}
2017
2614
}
2019
2616
2020
2617
/* Run network hooks */
2021
2618
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2025
2621
if(interfaces_hooks == NULL){
2026
2622
perror_plus("malloc");
2027
2623
goto end;
2028
2624
}
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
}
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2627
}
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
2038
2630
}
2039
2631
2040
2632
if(not debug){
2117
2709
}
2118
2710
2119
2711
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2122
2714
/* Look for any good interfaces */
2123
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2716
alphasort);
2125
2717
if(ret >= 1){
2126
2718
/* Add all found interfaces to interfaces list */
2127
2719
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2721
direntries[i]->d_name);
2130
2722
if(ret_errno != 0){
2723
errno = ret_errno;
2131
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2132
2726
continue;
2133
2727
}
2134
2728
if(debug){
2135
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2730
direntries[i]->d_name);
2137
2731
}
2732
free(direntries[i]);
2138
2733
}
2139
2734
free(direntries);
2140
2735
} else {
2141
free(direntries);
2736
if(ret == 0){
2737
free(direntries);
2738
}
2142
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2740
exitcode = EXIT_FAILURE;
2144
2741
goto end;
2145
2742
}
2146
2743
}
2147
2744
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)){
2745
/* Bring up interfaces which are down, and remove any "none"s */
2746
{
2160
2747
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2749
interface))){
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2754
interface);
2755
interface = NULL;
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
2760
interface);
2761
interface = NULL;
2762
}
2763
}
2764
break;
2765
}
2163
2766
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2767
errno = bring_up_interface(interface, delay);
2165
2768
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2769
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2169
2772
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2775
interface);
2776
if(errno != 0){
2777
perror_plus("argz_add");
2778
}
2173
2779
}
2174
2780
}
2175
2781
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2782
if(debug and (interfaces_to_take_down == NULL)){
2180
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2784
}
2182
2785
}
2183
2786
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2789
if(debug){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2791
mc.interfaces);
2792
}
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2794
}
2795
2184
2796
if(quit_now){
2185
2797
goto end;
2186
2798
}
2187
2799
2188
ret = init_gnutls_global(pubkey, seckey);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2189
2801
if(ret == -1){
2190
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
2803
exitcode = EX_UNAVAILABLE;
2198
2810
goto end;
2199
2811
}
2200
2812
2201
if(mkdtemp(tempdir) == NULL){
2813
/* Try /run/tmp before /tmp */
2814
tempdir = mkdtemp(run_tempdir);
2815
if(tempdir == NULL and errno == ENOENT){
2816
if(debug){
2817
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2818
run_tempdir, old_tempdir);
2819
}
2820
tempdir = mkdtemp(old_tempdir);
2821
}
2822
if(tempdir == NULL){
2202
2823
perror_plus("mkdtemp");
2203
2824
goto end;
2204
2825
}
2205
tempdir_created = true;
2206
2826
2207
2827
if(quit_now){
2208
2828
goto end;
2209
2829
}
2210
2830
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2831
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
2832
fprintf_plus(stderr, "init_gpgme failed\n");
2213
2833
exitcode = EX_UNAVAILABLE;
2214
2834
goto end;
2244
2864
exitcode = EX_USAGE;
2245
2865
goto end;
2246
2866
}
2247
2867
2248
2868
if(quit_now){
2249
2869
goto end;
2250
2870
}
2271
2891
}
2272
2892
2273
2893
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2894
ret = start_mandos_communication(address, port, if_index, af,
2895
&mc);
2275
2896
if(quit_now or ret == 0){
2276
2897
break;
2277
2898
}
2279
2900
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
2901
(int)retry_interval);
2281
2902
}
2282
sleep((int)retry_interval);
2903
sleep((unsigned int)retry_interval);
2283
2904
}
2284
2905
2285
if (not quit_now){
2906
if(not quit_now){
2286
2907
exitcode = EXIT_SUCCESS;
2287
2908
}
2288
2909
2304
2925
2305
2926
/* Allocate a new server */
2306
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2308
2929
2309
2930
/* Free the Avahi configuration data */
2310
2931
avahi_server_config_free(&config);
2313
2934
/* Check if creating the Avahi server object succeeded */
2314
2935
if(mc.server == NULL){
2315
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2317
2938
exitcode = EX_UNAVAILABLE;
2318
2939
goto end;
2319
2940
}
2325
2946
/* Create the Avahi service browser */
2326
2947
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
2948
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2949
NULL, 0, browse_callback,
2950
(void *)&mc);
2329
2951
if(sb == NULL){
2330
2952
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
2953
avahi_strerror(avahi_server_errno(mc.server)));
2342
2964
if(debug){
2343
2965
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
2966
}
2345
2967
2346
2968
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2969
(int)(retry_interval * 1000), &mc);
2348
2970
if(debug){
2349
2971
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
2972
(ret == 0) ? "successfully" : "with error");
2353
2975
end:
2354
2976
2355
2977
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2357
2985
}
2358
2986
2359
2987
/* Cleanup things */
2988
free(mc.interfaces);
2989
2360
2990
if(sb != NULL)
2361
2991
avahi_s_service_browser_free(sb);
2362
2992
2368
2998
2369
2999
if(gnutls_initialized){
2370
3000
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2372
3001
gnutls_dh_params_deinit(mc.dh_params);
2373
3002
}
2374
3003
2382
3011
mc.current_server->prev->next = NULL;
2383
3012
while(mc.current_server != NULL){
2384
3013
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
2385
3022
free(mc.current_server);
2386
3023
mc.current_server = next;
2387
3024
}
2388
3025
}
2389
3026
2390
/* Re-raise priviliges */
3027
/* Re-raise privileges */
2391
3028
{
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();
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to raise privileges");
3033
} else {
3034
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3038
3039
/* Take down the network interfaces which were brought up */
3040
{
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3048
perror_plus("Failed to take down interface");
3049
}
3050
}
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3053
" down\n");
3054
}
3055
}
3056
}
3057
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3061
perror_plus("Failed to lower privileges permanently");
3062
}
2417
3063
}
2418
3064
2419
3065
free(interfaces_to_take_down);
2420
3066
free(interfaces_hooks);
2421
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
2422
3122
/* 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
}
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2456
3125
}
2457
3126
2458
3127
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0