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- Committer: Teddy Hogeborn
- Date: 2012-06-16 22:38:54 UTC
- Revision ID: teddy@recompile.se-20120616223854-mfxkg6fgqr56sma5
* plugins.d/mandos-client (mandos_context): Removed "simple_poll"
member.
(simple_poll): New global variable. All users changed.
member.
(simple_poll): New global variable. All users changed.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2012 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
99
91
argz_delete(), argz_append(),
100
92
argz_stringify(), argz_add(),
101
93
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
94
105
95
#ifdef __linux__
106
96
#include <sys/klog.h> /* klogctl() */
148
138
static const char sys_class_net[] = "/sys/class/net";
149
139
char *connect_to = NULL;
150
140
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
141
uid_t uid = 65534;
153
142
gid_t gid = 65534;
154
143
172
161
const char *priority;
173
162
gpgme_ctx_t ctx;
174
163
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
164
} mandos_context;
178
165
179
166
/* global so signal handler can reach it*/
180
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
181
171
182
172
sig_atomic_t quit_now = 0;
183
173
int signal_received = 0;
191
181
perror(print_text);
192
182
}
193
183
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
__attribute__((format (gnu_printf, 2, 3)))
195
185
int fprintf_plus(FILE *stream, const char *format, ...){
196
186
va_list ap;
197
187
va_start (ap, format);
198
188
199
189
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
190
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
192
}
203
193
204
194
/*
206
196
* bytes. "buffer_capacity" is how much is currently allocated,
207
197
* "buffer_length" is how much is already used.
208
198
*/
209
__attribute__((nonnull, warn_unused_result))
210
199
size_t incbuffer(char **buffer, size_t buffer_length,
211
200
size_t buffer_capacity){
212
201
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
if(buffer == NULL){
219
204
return 0;
220
205
}
221
*buffer = new_buf;
222
206
buffer_capacity += BUFFER_SIZE;
223
207
}
224
208
return buffer_capacity;
225
209
}
226
210
227
211
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
213
int af){
231
214
int ret;
232
215
server *new_server = malloc(sizeof(server));
233
216
if(new_server == NULL){
240
223
.af = af };
241
224
if(new_server->ip == NULL){
242
225
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
226
return false;
259
227
}
260
228
/* Special case of first server */
261
if(*current_server == NULL){
229
if (mc.current_server == NULL){
262
230
new_server->next = new_server;
263
231
new_server->prev = new_server;
264
*current_server = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
265
234
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
269
237
new_server->prev->next = new_server;
270
(*current_server)->prev = 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;
271
244
}
272
245
return true;
273
246
}
275
248
/*
276
249
* Initialize GPGME.
277
250
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
283
253
gpgme_error_t rc;
284
254
gpgme_engine_info_t engine_info;
285
255
286
256
/*
287
257
* Helper function to insert pub and seckey to the engine keyring.
288
258
*/
289
bool import_key(const char * const filename){
259
bool import_key(const char *filename){
290
260
int ret;
291
261
int fd;
292
262
gpgme_data_t pgp_data;
304
274
return false;
305
275
}
306
276
307
rc = gpgme_op_import(mc->ctx, pgp_data);
277
rc = gpgme_op_import(mc.ctx, pgp_data);
308
278
if(rc != GPG_ERR_NO_ERROR){
309
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
280
gpgme_strsource(rc), gpgme_strerror(rc));
311
281
return false;
312
282
}
313
283
314
ret = close(fd);
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
285
if(ret == -1){
316
286
perror_plus("close");
317
287
}
354
324
}
355
325
356
326
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
327
rc = gpgme_new(&(mc.ctx));
358
328
if(rc != GPG_ERR_NO_ERROR){
359
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
373
343
* Decrypt OpenPGP data.
374
344
* Returns -1 on error
375
345
*/
376
__attribute__((nonnull, warn_unused_result))
377
346
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
347
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
348
char **plaintext){
381
349
gpgme_data_t dh_crypto, dh_plain;
382
350
gpgme_error_t rc;
383
351
ssize_t ret;
409
377
410
378
/* Decrypt data from the cryptotext data buffer to the plaintext
411
379
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
381
if(rc != GPG_ERR_NO_ERROR){
414
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
383
gpgme_strsource(rc), gpgme_strerror(rc));
416
384
plaintext_length = -1;
417
385
if(debug){
418
386
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
387
result = gpgme_op_decrypt_result(mc.ctx);
420
388
if(result == NULL){
421
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
390
} else {
499
467
return plaintext_length;
500
468
}
501
469
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){
470
static const char * safer_gnutls_strerror(int value){
511
471
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
513
475
}
514
476
515
477
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
478
static void debuggnutls(__attribute__((unused)) int level,
518
479
const char* string){
519
480
fprintf_plus(stderr, "GnuTLS: %s", string);
520
481
}
521
482
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
483
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
484
const char *seckeyfilename){
527
485
int ret;
528
unsigned int uret;
529
486
530
487
if(debug){
531
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
489
}
533
490
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
534
498
if(debug){
535
499
/* "Use a log level over 10 to enable all debugging options."
536
500
* - GnuTLS manual
540
504
}
541
505
542
506
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
508
if(ret != GNUTLS_E_SUCCESS){
545
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
510
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
547
512
return -1;
548
513
}
549
514
555
520
}
556
521
557
522
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
559
524
GNUTLS_OPENPGP_FMT_BASE64);
560
525
if(ret != GNUTLS_E_SUCCESS){
561
526
fprintf_plus(stderr,
567
532
}
568
533
569
534
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
571
536
if(ret != GNUTLS_E_SUCCESS){
572
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
538
" initialization: %s\n",
574
539
safer_gnutls_strerror(ret));
575
540
goto globalfail;
576
541
}
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);
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);
751
550
752
551
return 0;
753
552
754
553
globalfail:
755
554
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
758
558
return -1;
759
559
}
760
560
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
763
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
764
562
int ret;
765
563
/* GnuTLS session creation */
766
564
do {
778
576
{
779
577
const char *err;
780
578
do {
781
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
580
if(quit_now){
783
581
gnutls_deinit(*session);
784
582
return -1;
795
593
796
594
do {
797
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
798
mc->cred);
596
mc.cred);
799
597
if(quit_now){
800
598
gnutls_deinit(*session);
801
599
return -1;
811
609
/* ignore client certificate if any. */
812
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
813
611
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
814
614
return 0;
815
615
}
816
616
818
618
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
819
619
__attribute__((unused)) const char *txt){}
820
620
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
1039
621
/* Called when a Mandos server is found */
1040
__attribute__((nonnull, warn_unused_result))
1041
622
static int start_mandos_communication(const char *ip, in_port_t port,
1042
623
AvahiIfIndex if_index,
1043
int af, mandos_context *mc){
624
int af){
1044
625
int ret, tcp_sd = -1;
1045
626
ssize_t sret;
1046
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1047
631
char *buffer = NULL;
1048
632
char *decrypted_buffer = NULL;
1049
633
size_t buffer_length = 0;
1052
636
int retval = -1;
1053
637
gnutls_session_t session;
1054
638
int pf; /* Protocol family */
1055
bool route_added = false;
1056
639
1057
640
errno = 0;
1058
641
1074
657
return -1;
1075
658
}
1076
659
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);
660
ret = init_gnutls_session(&session);
1111
661
if(ret != 0){
1112
662
return -1;
1113
663
}
1117
667
PRIuMAX "\n", ip, (uintmax_t)port);
1118
668
}
1119
669
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
671
if(tcp_sd < 0){
1122
672
int e = errno;
1123
673
perror_plus("socket");
1130
680
goto mandos_end;
1131
681
}
1132
682
683
memset(&to, 0, sizeof(to));
1133
684
if(af == AF_INET6){
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);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
687
} else { /* IPv4 */
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);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
690
}
1142
691
if(ret < 0 ){
1143
692
int e = errno;
1152
701
goto mandos_end;
1153
702
}
1154
703
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
1158
708
if(if_index == AVAHI_IF_UNSPEC){
1159
709
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
710
" incomplete without a network interface\n");
1162
712
goto mandos_end;
1163
713
}
1164
714
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
716
}
1167
717
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1169
721
}
1170
722
1171
723
if(quit_now){
1188
740
}
1189
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
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;
1271
782
}
1272
783
1273
784
const char *out = mandos_protocol_version;
1424
935
if(buffer_length > 0){
1425
936
ssize_t decrypted_buffer_size;
1426
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
938
&decrypted_buffer);
1428
939
if(decrypted_buffer_size >= 0){
1429
940
1430
clearerr(stdout);
1431
941
written = 0;
1432
942
while(written < (size_t) decrypted_buffer_size){
1433
943
if(quit_now){
1449
959
}
1450
960
written += (size_t)ret;
1451
961
}
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
}
1462
962
retval = 0;
1463
963
}
1464
964
}
1467
967
1468
968
mandos_end:
1469
969
{
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
}
1476
970
int e = errno;
1477
971
free(decrypted_buffer);
1478
972
free(buffer);
1479
973
if(tcp_sd >= 0){
1480
ret = close(tcp_sd);
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
975
}
1482
976
if(ret == -1){
1483
977
if(e == 0){
1508
1002
AVAHI_GCC_UNUSED AvahiStringList *txt,
1509
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1510
1004
flags,
1511
void *mc){
1005
AVAHI_GCC_UNUSED void* userdata){
1512
1006
if(r == NULL){
1513
1007
return;
1514
1008
}
1517
1011
timed out */
1518
1012
1519
1013
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1521
1014
return;
1522
1015
}
1523
1016
1527
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
1022
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1023
avahi_strerror(avahi_server_errno(mc.server)));
1532
1024
break;
1533
1025
1534
1026
case AVAHI_RESOLVER_FOUND:
1542
1034
}
1543
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
1036
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1037
avahi_proto_to_af(proto));
1547
1038
if(ret == 0){
1548
1039
avahi_simple_poll_quit(simple_poll);
1549
1040
} else {
1550
1041
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1042
avahi_proto_to_af(proto))){
1553
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
1044
" list\n", name);
1555
1045
}
1568
1058
const char *domain,
1569
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1570
1060
flags,
1571
void *mc){
1061
AVAHI_GCC_UNUSED void* userdata){
1572
1062
if(b == NULL){
1573
1063
return;
1574
1064
}
1585
1075
case AVAHI_BROWSER_FAILURE:
1586
1076
1587
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1078
avahi_strerror(avahi_server_errno(mc.server)));
1590
1079
avahi_simple_poll_quit(simple_poll);
1591
1080
return;
1592
1081
1596
1085
the callback function is called the Avahi server will free the
1597
1086
resolver for us. */
1598
1087
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)
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
1603
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
1092
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1093
avahi_strerror(avahi_server_errno(mc.server)));
1607
1094
break;
1608
1095
1609
1096
case AVAHI_BROWSER_REMOVE:
1634
1121
errno = old_errno;
1635
1122
}
1636
1123
1637
__attribute__((nonnull, warn_unused_result))
1638
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1125
int ret;
1640
int old_errno;
1126
error_t ret_errno;
1641
1127
1642
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1129
if(s < 0){
1644
old_errno = errno;
1130
ret_errno = errno;
1645
1131
perror_plus("socket");
1646
errno = old_errno;
1132
errno = ret_errno;
1647
1133
return false;
1648
1134
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1135
strcpy(ifr->ifr_name, ifname);
1651
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1137
if(ret == -1){
1653
1138
if(debug){
1654
old_errno = errno;
1139
ret_errno = errno;
1655
1140
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1141
errno = ret_errno;
1657
1142
}
1658
1143
return false;
1659
1144
}
1660
1145
return true;
1661
1146
}
1662
1147
1663
__attribute__((nonnull, warn_unused_result))
1664
1148
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1149
1666
1150
/* Reject the loopback device */
1708
1192
* corresponds to an acceptable network device.
1709
1193
* (This function is passed to scandir(3) as a filter function.)
1710
1194
*/
1711
__attribute__((nonnull, warn_unused_result))
1712
1195
int good_interface(const struct dirent *if_entry){
1713
1196
if(if_entry->d_name[0] == '.'){
1714
1197
return 0;
1732
1215
/*
1733
1216
* This function determines if a network interface is up.
1734
1217
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
1218
bool interface_is_up(const char *interface){
1737
1219
struct ifreq ifr;
1738
1220
if(not get_flags(interface, &ifr)){
1749
1231
/*
1750
1232
* This function determines if a network interface is running
1751
1233
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
1234
bool interface_is_running(const char *interface){
1754
1235
struct ifreq ifr;
1755
1236
if(not get_flags(interface, &ifr)){
1763
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
1245
}
1765
1246
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
1247
int notdotentries(const struct dirent *direntry){
1768
1248
/* Skip "." and ".." */
1769
1249
if(direntry->d_name[0] == '.'
1776
1256
}
1777
1257
1778
1258
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
1259
int runnable_hook(const struct dirent *direntry){
1781
1260
int ret;
1782
1261
size_t sret;
1790
1269
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
1270
"abcdefghijklmnopqrstuvwxyz"
1792
1271
"0123456789"
1793
"_.-");
1272
"_-");
1794
1273
if((direntry->d_name)[sret] != '\0'){
1795
1274
/* Contains non-allowed characters */
1796
1275
if(debug){
1800
1279
return 0;
1801
1280
}
1802
1281
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1804
1290
if(ret == -1){
1805
1291
if(debug){
1806
1292
perror_plus("Could not stat hook");
1830
1316
return 1;
1831
1317
}
1832
1318
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
1320
int ret;
1837
1321
struct timespec now;
1838
1322
struct timespec waited_time;
1839
1323
intmax_t block_time;
1840
1324
1841
1325
while(true){
1842
if(mc->current_server == NULL){
1843
if(debug){
1326
if(mc.current_server == NULL){
1327
if (debug){
1844
1328
fprintf_plus(stderr, "Wait until first server is found."
1845
1329
" No timeout!\n");
1846
1330
}
1847
1331
ret = avahi_simple_poll_iterate(s, -1);
1848
1332
} else {
1849
if(debug){
1333
if (debug){
1850
1334
fprintf_plus(stderr, "Check current_server if we should run"
1851
1335
" it, or wait\n");
1852
1336
}
1859
1343
/* Calculating in ms how long time between now and server
1860
1344
who we visted longest time ago. Now - last seen. */
1861
1345
waited_time.tv_sec = (now.tv_sec
1862
- mc->current_server->last_seen.tv_sec);
1346
- mc.current_server->last_seen.tv_sec);
1863
1347
waited_time.tv_nsec = (now.tv_nsec
1864
- mc->current_server->last_seen.tv_nsec);
1348
- mc.current_server->last_seen.tv_nsec);
1865
1349
/* total time is 10s/10,000ms.
1866
1350
Converting to s from ms by dividing by 1,000,
1867
1351
and ns to ms by dividing by 1,000,000. */
1869
1353
- ((intmax_t)waited_time.tv_sec * 1000))
1870
1354
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
1355
1872
if(debug){
1356
if (debug){
1873
1357
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
1358
block_time);
1875
1359
}
1876
1360
1877
1361
if(block_time <= 0){
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);
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);
1882
1366
if(ret == 0){
1883
avahi_simple_poll_quit(s);
1367
avahi_simple_poll_quit(simple_poll);
1884
1368
return 0;
1885
1369
}
1886
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1887
&mc->current_server->last_seen);
1371
&mc.current_server->last_seen);
1888
1372
if(ret == -1){
1889
1373
perror_plus("clock_gettime");
1890
1374
return -1;
1891
1375
}
1892
mc->current_server = mc->current_server->next;
1376
mc.current_server = mc.current_server->next;
1893
1377
block_time = 0; /* Call avahi to find new Mandos
1894
1378
servers, but don't block */
1895
1379
}
1897
1381
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
1382
}
1899
1383
if(ret != 0){
1900
if(ret > 0 or errno != EINTR){
1384
if (ret > 0 or errno != EINTR){
1901
1385
return (ret != 1) ? ret : 0;
1902
1386
}
1903
1387
}
1904
1388
}
1905
1389
}
1906
1390
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
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,
1909
1444
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1445
struct dirent **direntries;
1446
struct dirent *direntry;
1447
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1928
1450
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
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");
1944
1458
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
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){
1991
1466
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
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
}
1996
1525
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
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
}
2065
1537
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
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;
2085
1574
}
2086
1575
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
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;
2092
1582
struct ifreq network;
2093
1583
unsigned int if_index = if_nametoindex(interface);
2094
1584
if(if_index == 0){
2103
1593
}
2104
1594
2105
1595
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1596
if(not get_flags(interface, &network) and debug){
2109
1597
ret_errno = errno;
2110
1598
fprintf_plus(stderr, "Failed to get flags for interface "
2111
1599
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
1600
return ret_errno;
2114
1601
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
1602
network.ifr_flags |= IFF_UP;
2116
1603
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2119
1606
ret_errno = errno;
2120
1607
perror_plus("socket");
2121
1608
errno = old_errno;
2122
1609
return ret_errno;
2123
1610
}
2124
1611
2125
1612
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1613
close(sd);
2130
1614
errno = old_errno;
2131
1615
return EINTR;
2132
1616
}
2136
1620
interface);
2137
1621
}
2138
1622
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
1623
/* Raise priviliges */
1624
raise_privileges();
2145
1625
2146
1626
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
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");
2158
1634
}
2159
1635
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2162
1638
#ifdef __linux__
2163
1639
if(restore_loglevel){
2164
1640
ret_linux = klogctl(7, NULL, 0);
2168
1644
}
2169
1645
#endif /* __linux__ */
2170
1646
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
1647
/* Lower privileges */
1648
lower_privileges();
2180
1649
2181
1650
/* Close the socket */
2182
ret = close(sd);
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1652
if(ret == -1){
2184
1653
perror_plus("close");
2185
1654
}
2186
1655
2187
1656
if(ret_setflags == -1){
2188
errno = ioctl_errno;
1657
errno = ret_errno;
2189
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
1659
errno = old_errno;
2191
return ioctl_errno;
1660
return ret_errno;
2192
1661
}
2193
1662
} else if(debug){
2194
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
1666
2198
1667
/* Sleep checking until interface is running.
2199
1668
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
1669
for(int i=0; i < delay * 4; i++){
2201
1670
if(interface_is_running(interface)){
2202
1671
break;
2203
1672
}
2212
1681
return 0;
2213
1682
}
2214
1683
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
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;
2218
1689
struct ifreq network;
2219
1690
unsigned int if_index = if_nametoindex(interface);
2220
1691
if(if_index == 0){
2223
1694
return ENXIO;
2224
1695
}
2225
1696
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
1697
if(not get_flags(interface, &network) and debug){
2229
1698
ret_errno = errno;
2230
1699
fprintf_plus(stderr, "Failed to get flags for interface "
2231
1700
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
1701
return ret_errno;
2234
1702
}
2235
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
1704
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2239
1707
ret_errno = errno;
2240
1708
perror_plus("socket");
2241
1709
errno = old_errno;
2247
1715
interface);
2248
1716
}
2249
1717
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
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();
2269
1726
2270
1727
/* Close the socket */
2271
int ret = close(sd);
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
1729
if(ret == -1){
2273
1730
perror_plus("close");
2274
1731
}
2275
1732
2276
1733
if(ret_setflags == -1){
2277
errno = ioctl_errno;
1734
errno = ret_errno;
2278
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
1736
errno = old_errno;
2280
return ioctl_errno;
1737
return ret_errno;
2281
1738
}
2282
1739
} else if(debug){
2283
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2289
1746
}
2290
1747
2291
1748
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
2297
1749
AvahiSServiceBrowser *sb = NULL;
2298
1750
error_t ret_errno;
2299
1751
int ret;
2300
1752
intmax_t tmpmax;
2301
1753
char *tmp;
2302
1754
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
2303
1757
char *interfaces_to_take_down = NULL;
2304
1758
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2308
1761
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1762
const char *seckey = PATHDIR "/" SECKEY;
2310
1763
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
2313
1766
2314
1767
bool gnutls_initialized = false;
2315
1768
bool gpgme_initialized = false;
2367
1820
.doc = "Bit length of the prime number used in the"
2368
1821
" Diffie-Hellman key exchange",
2369
1822
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
2375
1823
{ .name = "priority", .key = 130,
2376
1824
.arg = "STRING",
2377
1825
.doc = "GnuTLS priority string for the TLS handshake",
2411
1859
connect_to = arg;
2412
1860
break;
2413
1861
case 'i': /* --interface */
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2416
1864
if(ret_errno != 0){
2417
1865
argp_error(state, "%s", strerror(ret_errno));
2418
1866
}
2432
1880
}
2433
1881
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
1882
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
2438
1883
case 130: /* --priority */
2439
1884
mc.priority = arg;
2440
1885
break;
2480
1925
.args_doc = "",
2481
1926
.doc = "Mandos client -- Get and decrypt"
2482
1927
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
2486
1931
case 0:
2487
1932
break;
2488
1933
case ENOMEM:
2489
1934
default:
2490
errno = ret_errno;
1935
errno = ret;
2491
1936
perror_plus("argp_parse");
2492
1937
exitcode = EX_OSERR;
2493
1938
goto end;
2496
1941
goto end;
2497
1942
}
2498
1943
}
2499
1944
2500
1945
{
2501
1946
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
1947
<http://bugs.debian.org/633582> */
2503
1948
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2510
1951
struct stat st;
2511
1952
2512
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2526
1967
}
2527
1968
}
2528
1969
}
2529
close(seckey_fd);
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2530
1971
}
2531
1972
}
2532
1973
2533
1974
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
1975
int pubkey_fd = open(pubkey, O_RDONLY);
2535
1976
if(pubkey_fd == -1){
2547
1988
}
2548
1989
}
2549
1990
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2576
1995
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2581
2000
}
2582
2001
}
2583
2002
}
2584
2003
2585
/* Remove invalid interface names (except "none") */
2004
/* Remove empty interface names */
2586
2005
{
2587
2006
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2007
while((interface = argz_next(interfaces, interfaces_size,
2589
2008
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2593
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2594
2012
" \"%s\"\n", interface);
2595
2013
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2014
argz_delete(&interfaces, &interfaces_size, interface);
2597
2015
interface = NULL;
2598
2016
}
2599
2017
}
2601
2019
2602
2020
/* Run network hooks */
2603
2021
{
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2606
2025
if(interfaces_hooks == NULL){
2607
2026
perror_plus("malloc");
2608
2027
goto end;
2609
2028
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
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
}
2615
2038
}
2616
2039
2617
2040
if(not debug){
2694
2117
}
2695
2118
2696
2119
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2699
2122
/* Look for any good interfaces */
2700
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2701
2124
alphasort);
2702
2125
if(ret >= 1){
2703
2126
/* Add all found interfaces to interfaces list */
2704
2127
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2706
2129
direntries[i]->d_name);
2707
2130
if(ret_errno != 0){
2708
errno = ret_errno;
2709
2131
perror_plus("argz_add");
2710
free(direntries[i]);
2711
2132
continue;
2712
2133
}
2713
2134
if(debug){
2714
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
2136
direntries[i]->d_name);
2716
2137
}
2717
free(direntries[i]);
2718
2138
}
2719
2139
free(direntries);
2720
2140
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2141
free(direntries);
2724
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2725
2143
exitcode = EXIT_FAILURE;
2726
2144
goto end;
2727
2145
}
2728
2146
}
2729
2147
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
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)){
2732
2160
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2161
while((interface = argz_next(interfaces, interfaces_size,
2734
2162
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
2747
}
2748
}
2749
break;
2750
}
2751
2163
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2164
ret = bring_up_interface(interface, delay);
2753
2165
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2757
2169
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2764
2173
}
2765
2174
}
2766
2175
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2767
2179
if(debug and (interfaces_to_take_down == NULL)){
2768
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
2181
}
2770
2182
}
2771
2183
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2779
}
2780
2781
2184
if(quit_now){
2782
2185
goto end;
2783
2186
}
2784
2187
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2188
ret = init_gnutls_global(pubkey, seckey);
2786
2189
if(ret == -1){
2787
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
2788
2191
exitcode = EX_UNAVAILABLE;
2795
2198
goto end;
2796
2199
}
2797
2200
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2201
if(mkdtemp(tempdir) == NULL){
2808
2202
perror_plus("mkdtemp");
2809
2203
goto end;
2810
2204
}
2205
tempdir_created = true;
2811
2206
2812
2207
if(quit_now){
2813
2208
goto end;
2814
2209
}
2815
2210
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2817
2212
fprintf_plus(stderr, "init_gpgme failed\n");
2818
2213
exitcode = EX_UNAVAILABLE;
2819
2214
goto end;
2849
2244
exitcode = EX_USAGE;
2850
2245
goto end;
2851
2246
}
2852
2247
2853
2248
if(quit_now){
2854
2249
goto end;
2855
2250
}
2876
2271
}
2877
2272
2878
2273
while(not quit_now){
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
2274
ret = start_mandos_communication(address, port, if_index, af);
2881
2275
if(quit_now or ret == 0){
2882
2276
break;
2883
2277
}
2885
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
2280
(int)retry_interval);
2887
2281
}
2888
sleep((unsigned int)retry_interval);
2282
sleep((int)retry_interval);
2889
2283
}
2890
2284
2891
if(not quit_now){
2285
if (not quit_now){
2892
2286
exitcode = EXIT_SUCCESS;
2893
2287
}
2894
2288
2910
2304
2911
2305
/* Allocate a new server */
2912
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2307
&config, NULL, NULL, &ret_errno);
2914
2308
2915
2309
/* Free the Avahi configuration data */
2916
2310
avahi_server_config_free(&config);
2919
2313
/* Check if creating the Avahi server object succeeded */
2920
2314
if(mc.server == NULL){
2921
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2316
avahi_strerror(ret_errno));
2923
2317
exitcode = EX_UNAVAILABLE;
2924
2318
goto end;
2925
2319
}
2931
2325
/* Create the Avahi service browser */
2932
2326
sb = avahi_s_service_browser_new(mc.server, if_index,
2933
2327
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2328
NULL, 0, browse_callback, NULL);
2936
2329
if(sb == NULL){
2937
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2938
2331
avahi_strerror(avahi_server_errno(mc.server)));
2949
2342
if(debug){
2950
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2951
2344
}
2952
2345
2953
2346
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2347
(int)(retry_interval * 1000));
2955
2348
if(debug){
2956
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
2350
(ret == 0) ? "successfully" : "with error");
2960
2353
end:
2961
2354
2962
2355
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2357
}
2971
2358
2972
2359
/* Cleanup things */
2973
free(mc.interfaces);
2974
2975
2360
if(sb != NULL)
2976
2361
avahi_s_service_browser_free(sb);
2977
2362
2983
2368
2984
2369
if(gnutls_initialized){
2985
2370
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2986
2372
gnutls_dh_params_deinit(mc.dh_params);
2987
2373
}
2988
2374
2996
2382
mc.current_server->prev->next = NULL;
2997
2383
while(mc.current_server != NULL){
2998
2384
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
3007
2385
free(mc.current_server);
3008
2386
mc.current_server = next;
3009
2387
}
3010
2388
}
3011
2389
3012
/* Re-raise privileges */
2390
/* Re-raise priviliges */
3013
2391
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
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();
3048
2417
}
3049
2418
3050
2419
free(interfaces_to_take_down);
3051
2420
free(interfaces_hooks);
3052
2421
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
2422
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
3055
2424
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
3068
2429
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
/* Removes the GPGME temp directory and all files inside */
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
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
}
3112
2456
}
3113
2457
3114
2458
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0