To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 945
- compare with another revision
- download diff
- download tarball
- view history from revision 945
- Committer: Teddy Hogeborn
- Date: 2018-04-01 19:31:31 UTC
- Revision ID: teddy@recompile.se-20180401193131-w8but5r9ryne9et4
Print a boolean more readably in error message output
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
print wrong_key_usage as "Yes" or "No", not a number.
* plugins.d/mandos-client.c (pgp_packet_decrypt): If decryption fails,
print wrong_key_usage as "Yes" or "No", not a number.
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
154
165
155
166
/* Used for passing in values through the Avahi callback functions */
156
167
typedef struct {
157
AvahiSimplePoll *simple_poll;
158
168
AvahiServer *server;
159
169
gnutls_certificate_credentials_t cred;
160
170
unsigned int dh_bits;
162
172
const char *priority;
163
173
gpgme_ctx_t ctx;
164
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
165
177
} mandos_context;
166
178
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
172
181
173
182
sig_atomic_t quit_now = 0;
174
183
int signal_received = 0;
182
191
perror(print_text);
183
192
}
184
193
185
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
195
int fprintf_plus(FILE *stream, const char *format, ...){
187
196
va_list ap;
188
197
va_start (ap, format);
189
198
190
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
200
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
202
}
194
203
195
204
/*
197
206
* bytes. "buffer_capacity" is how much is currently allocated,
198
207
* "buffer_length" is how much is already used.
199
208
*/
209
__attribute__((nonnull, warn_unused_result))
200
210
size_t incbuffer(char **buffer, size_t buffer_length,
201
211
size_t buffer_capacity){
202
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
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;
205
219
return 0;
206
220
}
221
*buffer = new_buf;
207
222
buffer_capacity += BUFFER_SIZE;
208
223
}
209
224
return buffer_capacity;
210
225
}
211
226
212
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
213
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
230
int af, server **current_server){
215
231
int ret;
216
232
server *new_server = malloc(sizeof(server));
217
233
if(new_server == NULL){
224
240
.af = af };
225
241
if(new_server->ip == NULL){
226
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);
227
258
return false;
228
259
}
229
260
/* Special case of first server */
230
if (mc.current_server == NULL){
261
if(*current_server == NULL){
231
262
new_server->next = new_server;
232
263
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
264
*current_server = new_server;
235
265
} else {
236
new_server->next = mc.current_server;
237
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;
238
269
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
270
(*current_server)->prev = new_server;
245
271
}
246
272
return true;
247
273
}
249
275
/*
250
276
* Initialize GPGME.
251
277
*/
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
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){
254
283
gpgme_error_t rc;
255
284
gpgme_engine_info_t engine_info;
256
285
257
258
286
/*
259
287
* Helper function to insert pub and seckey to the engine keyring.
260
288
*/
261
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
262
290
int ret;
263
291
int fd;
264
292
gpgme_data_t pgp_data;
276
304
return false;
277
305
}
278
306
279
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
280
308
if(rc != GPG_ERR_NO_ERROR){
281
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
310
gpgme_strsource(rc), gpgme_strerror(rc));
283
311
return false;
284
312
}
285
313
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
287
315
if(ret == -1){
288
316
perror_plus("close");
289
317
}
326
354
}
327
355
328
356
/* Create new GPGME "context" */
329
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
330
358
if(rc != GPG_ERR_NO_ERROR){
331
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
373
* Decrypt OpenPGP data.
346
374
* Returns -1 on error
347
375
*/
376
__attribute__((nonnull, warn_unused_result))
348
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
349
378
size_t crypto_size,
350
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
351
381
gpgme_data_t dh_crypto, dh_plain;
352
382
gpgme_error_t rc;
353
383
ssize_t ret;
379
409
380
410
/* Decrypt data from the cryptotext data buffer to the plaintext
381
411
data buffer */
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
413
if(rc != GPG_ERR_NO_ERROR){
384
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
415
gpgme_strsource(rc), gpgme_strerror(rc));
386
416
plaintext_length = -1;
387
417
if(debug){
388
418
gpgme_decrypt_result_t result;
389
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
390
420
if(result == NULL){
391
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
392
422
} else {
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
427
fprintf_plus(stderr, "Wrong key usage: %s\n",
428
result->wrong_key_usage ? "Yes" : "No");
397
429
if(result->file_name != NULL){
398
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
431
}
469
501
return plaintext_length;
470
502
}
471
503
472
static const char * safer_gnutls_strerror(int value){
504
__attribute__((warn_unused_result, const))
505
static const char *safe_string(const char *str){
506
if(str == NULL)
507
return "(unknown)";
508
return str;
509
}
510
511
__attribute__((warn_unused_result))
512
static const char *safer_gnutls_strerror(int value){
473
513
const char *ret = gnutls_strerror(value);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
514
return safe_string(ret);
477
515
}
478
516
479
517
/* GnuTLS log function callback */
518
__attribute__((nonnull))
480
519
static void debuggnutls(__attribute__((unused)) int level,
481
520
const char* string){
482
521
fprintf_plus(stderr, "GnuTLS: %s", string);
483
522
}
484
523
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
485
525
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
526
const char *seckeyfilename,
527
const char *dhparamsfilename,
528
mandos_context *mc){
487
529
int ret;
530
unsigned int uret;
488
531
489
532
if(debug){
490
533
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
534
}
492
535
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
497
return -1;
498
}
499
500
536
if(debug){
501
537
/* "Use a log level over 10 to enable all debugging options."
502
538
* - GnuTLS manual
506
542
}
507
543
508
544
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
546
if(ret != GNUTLS_E_SUCCESS){
511
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
548
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
514
549
return -1;
515
550
}
516
551
522
557
}
523
558
524
559
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
526
561
GNUTLS_OPENPGP_FMT_BASE64);
527
562
if(ret != GNUTLS_E_SUCCESS){
528
563
fprintf_plus(stderr,
534
569
}
535
570
536
571
/* GnuTLS server initialization */
537
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
538
573
if(ret != GNUTLS_E_SUCCESS){
539
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
575
" initialization: %s\n",
541
576
safer_gnutls_strerror(ret));
542
577
goto globalfail;
543
578
}
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
624
}
625
if(dhparamsfilename == NULL){
626
break;
627
}
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
635
}
636
free(params.data);
637
} while(false);
638
}
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
644
do {
645
int secfile = open(seckeyfilename, O_RDONLY);
646
if(secfile == -1){
647
perror_plus("open");
648
break;
649
}
650
size_t buffer_capacity = 0;
651
while(true){
652
buffer_capacity = incbuffer((char **)&buffer.data,
653
(size_t)buffer.size,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
657
free(buffer.data);
658
buffer.data = NULL;
659
break;
660
}
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
663
BUFFER_SIZE);
664
/* EOF */
665
if(bytes_read == 0){
666
break;
667
}
668
/* check bytes_read for failure */
669
if(bytes_read < 0){
670
perror_plus("read");
671
free(buffer.data);
672
buffer.data = NULL;
673
break;
674
}
675
buffer.size += (unsigned int)bytes_read;
676
}
677
close(secfile);
678
} while(false);
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
682
{
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
687
" structure: %s",
688
safer_gnutls_strerror(ret));
689
free(buffer.data);
690
buffer.data = NULL;
691
} else {
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
697
privkey = NULL;
698
}
699
free(buffer.data);
700
buffer.data = NULL;
701
if(privkey != NULL){
702
/* Use private key to suggest an appropriate
703
sec_param */
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
706
if(debug){
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
710
(sec_param)));
711
}
712
}
713
}
714
}
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
718
if(debug){
719
fprintf_plus(stderr, "Falling back to security parameter"
720
" \"%s\"\n",
721
safe_string(gnutls_sec_param_get_name
722
(sec_param)));
723
}
724
}
725
}
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
727
if(uret != 0){
728
mc->dh_bits = uret;
729
if(debug){
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
mc->dh_bits);
735
}
736
} else {
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
740
(sec_param)),
741
safer_gnutls_strerror(ret));
742
goto globalfail;
743
}
744
} else if(debug){
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
mc->dh_bits);
747
}
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
753
goto globalfail;
754
}
755
}
756
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
552
757
553
758
return 0;
554
759
555
760
globalfail:
556
761
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
762
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
560
764
return -1;
561
765
}
562
766
563
static int init_gnutls_session(gnutls_session_t *session){
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
769
mandos_context *mc){
564
770
int ret;
565
771
/* GnuTLS session creation */
566
772
do {
578
784
{
579
785
const char *err;
580
786
do {
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
788
if(quit_now){
583
789
gnutls_deinit(*session);
584
790
return -1;
595
801
596
802
do {
597
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc.cred);
804
mc->cred);
599
805
if(quit_now){
600
806
gnutls_deinit(*session);
601
807
return -1;
611
817
/* ignore client certificate if any. */
612
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
819
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
616
820
return 0;
617
821
}
618
822
620
824
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
825
__attribute__((unused)) const char *txt){}
622
826
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
832
if(seteuid(0) == -1){
833
ret = errno;
834
}
835
errno = old_errno;
836
return ret;
837
}
838
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
if(ret != 0){
845
errno = old_errno;
846
return ret;
847
}
848
if(setuid(0) == -1){
849
ret = errno;
850
}
851
errno = old_errno;
852
return ret;
853
}
854
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
860
if(seteuid(uid) == -1){
861
ret = errno;
862
}
863
errno = old_errno;
864
return ret;
865
}
866
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
872
if(setuid(uid) == -1){
873
ret = errno;
874
}
875
errno = old_errno;
876
return ret;
877
}
878
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
882
const char *address,
883
AvahiIfIndex if_index){
884
int ret;
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
891
if(debug){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
894
}
895
return false;
896
}
897
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
901
return false;
902
}
903
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
905
if(devnull == -1){
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
return false;
908
}
909
pid_t pid = fork();
910
if(pid == 0){
911
/* Child */
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
914
if(errno != 0){
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
917
} else {
918
/* Set group */
919
errno = 0;
920
ret = setgid(0);
921
if(ret == -1){
922
perror_plus("setgid");
923
_exit(EX_NOPERM);
924
}
925
/* Reset supplementary groups */
926
errno = 0;
927
ret = setgroups(0, NULL);
928
if(ret == -1){
929
perror_plus("setgroups");
930
_exit(EX_NOPERM);
931
}
932
}
933
ret = dup2(devnull, STDIN_FILENO);
934
if(ret == -1){
935
perror_plus("dup2(devnull, STDIN_FILENO)");
936
_exit(EX_OSERR);
937
}
938
ret = close(devnull);
939
if(ret == -1){
940
perror_plus("close");
941
_exit(EX_OSERR);
942
}
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
944
if(ret == -1){
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
_exit(EX_OSERR);
947
}
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
O_RDONLY
950
| O_DIRECTORY
951
| O_PATH
952
| O_CLOEXEC));
953
if(helperdir_fd == -1){
954
perror_plus("open");
955
_exit(EX_UNAVAILABLE);
956
}
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
helper, O_RDONLY));
959
if(helper_fd == -1){
960
perror_plus("openat");
961
close(helperdir_fd);
962
_exit(EX_UNAVAILABLE);
963
}
964
close(helperdir_fd);
965
#ifdef __GNUC__
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
968
#endif
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
972
environ) == -1){
973
#ifdef __GNUC__
974
#pragma GCC diagnostic pop
975
#endif
976
perror_plus("fexecve");
977
_exit(EXIT_FAILURE);
978
}
979
}
980
if(pid == -1){
981
perror_plus("fork");
982
return false;
983
}
984
int status;
985
pid_t pret = -1;
986
errno = 0;
987
do {
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
995
}
996
if(kill(pid, SIGTERM) == -1){
997
perror_plus("kill");
998
}
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1001
" helper program");
1002
}
1003
return false;
1004
}
1005
} while(pret == -1 and errno == EINTR);
1006
if(pret == -1){
1007
perror_plus("waitpid");
1008
return false;
1009
}
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1014
return false;
1015
}
1016
return true;
1017
}
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1021
return false;
1022
}
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1024
return false;
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1032
}
1033
return add_delete_local_route(true, address, if_index);
1034
}
1035
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1039
if(debug){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1041
}
1042
return add_delete_local_route(false, address, if_index);
1043
}
1044
623
1045
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
624
1047
static int start_mandos_communication(const char *ip, in_port_t port,
625
1048
AvahiIfIndex if_index,
626
int af){
1049
int af, mandos_context *mc){
627
1050
int ret, tcp_sd = -1;
628
1051
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1052
struct sockaddr_storage to;
633
1053
char *buffer = NULL;
634
1054
char *decrypted_buffer = NULL;
635
1055
size_t buffer_length = 0;
638
1058
int retval = -1;
639
1059
gnutls_session_t session;
640
1060
int pf; /* Protocol family */
1061
bool route_added = false;
641
1062
642
1063
errno = 0;
643
1064
659
1080
return -1;
660
1081
}
661
1082
662
ret = init_gnutls_session(&session);
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1086
bool match = false;
1087
{
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
match = true;
1094
break;
1095
}
1096
}
1097
}
1098
if(not match){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1101
if(debug){
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1105
} else {
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1107
" \"%s\"\n",
1108
if_indextoname((unsigned int)if_index,
1109
interface));
1110
}
1111
}
1112
return -1;
1113
}
1114
}
1115
1116
ret = init_gnutls_session(&session, mc);
663
1117
if(ret != 0){
664
1118
return -1;
665
1119
}
669
1123
PRIuMAX "\n", ip, (uintmax_t)port);
670
1124
}
671
1125
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
673
1127
if(tcp_sd < 0){
674
1128
int e = errno;
675
1129
perror_plus("socket");
682
1136
goto mandos_end;
683
1137
}
684
1138
685
memset(&to, 0, sizeof(to));
686
1139
if(af == AF_INET6){
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
689
1143
} else { /* IPv4 */
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
692
1147
}
693
1148
if(ret < 0 ){
694
1149
int e = errno;
703
1158
goto mandos_end;
704
1159
}
705
1160
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
710
1164
if(if_index == AVAHI_IF_UNSPEC){
711
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
712
1166
" incomplete without a network interface\n");
714
1168
goto mandos_end;
715
1169
}
716
1170
/* Set the network interface number as scope */
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
1172
}
719
1173
} else {
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
723
1175
}
724
1176
725
1177
if(quit_now){
742
1194
}
743
1195
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
1196
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1197
if(af == AF_INET6){
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
} else {
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1206
NI_NUMERICHOST);
1207
}
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
}
1215
}
1216
1217
if(quit_now){
1218
errno = EINTR;
1219
goto mandos_end;
1220
}
1221
1222
while(true){
1223
if(af == AF_INET6){
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1226
} else {
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1229
}
1230
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1237
&to)->sin6_addr)))
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1248
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1252
*/
1253
if(debug){
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1255
" direct route\n");
1256
}
1257
int e = errno;
1258
route_added = add_local_route(ip, if_index);
1259
if(route_added){
1260
continue;
1261
}
1262
errno = e;
1263
}
1264
if(errno != ECONNREFUSED or debug){
1265
int e = errno;
1266
perror_plus("connect");
1267
errno = e;
1268
}
1269
goto mandos_end;
1270
}
1271
1272
if(quit_now){
1273
errno = EINTR;
1274
goto mandos_end;
1275
}
1276
break;
784
1277
}
785
1278
786
1279
const char *out = mandos_protocol_version;
937
1430
if(buffer_length > 0){
938
1431
ssize_t decrypted_buffer_size;
939
1432
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
940
&decrypted_buffer);
1433
&decrypted_buffer, mc);
941
1434
if(decrypted_buffer_size >= 0){
942
1435
1436
clearerr(stdout);
943
1437
written = 0;
944
1438
while(written < (size_t) decrypted_buffer_size){
945
1439
if(quit_now){
961
1455
}
962
1456
written += (size_t)ret;
963
1457
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
964
1468
retval = 0;
965
1469
}
966
1470
}
969
1473
970
1474
mandos_end:
971
1475
{
1476
if(route_added){
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1480
}
1481
}
972
1482
int e = errno;
973
1483
free(decrypted_buffer);
974
1484
free(buffer);
975
1485
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1486
ret = close(tcp_sd);
977
1487
}
978
1488
if(ret == -1){
979
1489
if(e == 0){
1004
1514
AVAHI_GCC_UNUSED AvahiStringList *txt,
1005
1515
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
1516
flags,
1007
AVAHI_GCC_UNUSED void* userdata){
1517
void *mc){
1008
1518
if(r == NULL){
1009
1519
return;
1010
1520
}
1013
1523
timed out */
1014
1524
1015
1525
if(quit_now){
1526
avahi_s_service_resolver_free(r);
1016
1527
return;
1017
1528
}
1018
1529
1022
1533
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
1534
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
1535
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
1536
avahi_strerror(avahi_server_errno
1537
(((mandos_context*)mc)->server)));
1026
1538
break;
1027
1539
1028
1540
case AVAHI_RESOLVER_FOUND:
1036
1548
}
1037
1549
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
1550
interface,
1039
avahi_proto_to_af(proto));
1551
avahi_proto_to_af(proto),
1552
mc);
1040
1553
if(ret == 0){
1041
avahi_simple_poll_quit(mc.simple_poll);
1554
avahi_simple_poll_quit(simple_poll);
1042
1555
} else {
1043
1556
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1557
avahi_proto_to_af(proto),
1558
&((mandos_context*)mc)->current_server)){
1045
1559
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
1560
" list\n", name);
1047
1561
}
1060
1574
const char *domain,
1061
1575
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
1576
flags,
1063
AVAHI_GCC_UNUSED void* userdata){
1577
void *mc){
1064
1578
if(b == NULL){
1065
1579
return;
1066
1580
}
1077
1591
case AVAHI_BROWSER_FAILURE:
1078
1592
1079
1593
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1596
avahi_simple_poll_quit(simple_poll);
1082
1597
return;
1083
1598
1084
1599
case AVAHI_BROWSER_NEW:
1087
1602
the callback function is called the Avahi server will free the
1088
1603
resolver for us. */
1089
1604
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1605
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1606
interface, protocol, name, type,
1607
domain, protocol, 0,
1608
resolve_callback, mc) == NULL)
1093
1609
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1610
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1611
avahi_strerror(avahi_server_errno
1612
(((mandos_context*)mc)->server)));
1096
1613
break;
1097
1614
1098
1615
case AVAHI_BROWSER_REMOVE:
1117
1634
signal_received = sig;
1118
1635
int old_errno = errno;
1119
1636
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1122
1639
}
1123
1640
errno = old_errno;
1124
1641
}
1125
1642
1643
__attribute__((nonnull, warn_unused_result))
1126
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1645
int ret;
1128
error_t ret_errno;
1646
int old_errno;
1129
1647
1130
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
1649
if(s < 0){
1132
ret_errno = errno;
1650
old_errno = errno;
1133
1651
perror_plus("socket");
1134
errno = ret_errno;
1652
errno = old_errno;
1135
1653
return false;
1136
1654
}
1137
strcpy(ifr->ifr_name, ifname);
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1138
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
1658
if(ret == -1){
1140
1659
if(debug){
1141
ret_errno = errno;
1660
old_errno = errno;
1142
1661
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1144
1668
}
1145
1669
return false;
1146
1670
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1147
1676
return true;
1148
1677
}
1149
1678
1679
__attribute__((nonnull, warn_unused_result))
1150
1680
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1681
1152
1682
/* Reject the loopback device */
1194
1724
* corresponds to an acceptable network device.
1195
1725
* (This function is passed to scandir(3) as a filter function.)
1196
1726
*/
1727
__attribute__((nonnull, warn_unused_result))
1197
1728
int good_interface(const struct dirent *if_entry){
1198
1729
if(if_entry->d_name[0] == '.'){
1199
1730
return 0;
1217
1748
/*
1218
1749
* This function determines if a network interface is up.
1219
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1220
1752
bool interface_is_up(const char *interface){
1221
1753
struct ifreq ifr;
1222
1754
if(not get_flags(interface, &ifr)){
1233
1765
/*
1234
1766
* This function determines if a network interface is running
1235
1767
*/
1768
__attribute__((nonnull, warn_unused_result))
1236
1769
bool interface_is_running(const char *interface){
1237
1770
struct ifreq ifr;
1238
1771
if(not get_flags(interface, &ifr)){
1246
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1780
}
1248
1781
1782
__attribute__((nonnull, pure, warn_unused_result))
1249
1783
int notdotentries(const struct dirent *direntry){
1250
1784
/* Skip "." and ".." */
1251
1785
if(direntry->d_name[0] == '.'
1258
1792
}
1259
1793
1260
1794
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1261
1796
int runnable_hook(const struct dirent *direntry){
1262
1797
int ret;
1263
1798
size_t sret;
1271
1806
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1807
"abcdefghijklmnopqrstuvwxyz"
1273
1808
"0123456789"
1274
"_-");
1809
"_.-");
1275
1810
if((direntry->d_name)[sret] != '\0'){
1276
1811
/* Contains non-allowed characters */
1277
1812
if(debug){
1281
1816
return 0;
1282
1817
}
1283
1818
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1820
if(ret == -1){
1293
1821
if(debug){
1294
1822
perror_plus("Could not stat hook");
1318
1846
return 1;
1319
1847
}
1320
1848
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1322
1852
int ret;
1323
1853
struct timespec now;
1324
1854
struct timespec waited_time;
1325
1855
intmax_t block_time;
1326
1856
1327
1857
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1858
if(mc->current_server == NULL){
1859
if(debug){
1330
1860
fprintf_plus(stderr, "Wait until first server is found."
1331
1861
" No timeout!\n");
1332
1862
}
1333
1863
ret = avahi_simple_poll_iterate(s, -1);
1334
1864
} else {
1335
if (debug){
1865
if(debug){
1336
1866
fprintf_plus(stderr, "Check current_server if we should run"
1337
1867
" it, or wait\n");
1338
1868
}
1345
1875
/* Calculating in ms how long time between now and server
1346
1876
who we visted longest time ago. Now - last seen. */
1347
1877
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1878
- mc->current_server->last_seen.tv_sec);
1349
1879
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1880
- mc->current_server->last_seen.tv_nsec);
1351
1881
/* total time is 10s/10,000ms.
1352
1882
Converting to s from ms by dividing by 1,000,
1353
1883
and ns to ms by dividing by 1,000,000. */
1355
1885
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1886
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1887
1358
if (debug){
1888
if(debug){
1359
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1890
block_time);
1361
1891
}
1362
1892
1363
1893
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1368
1898
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1899
avahi_simple_poll_quit(s);
1370
1900
return 0;
1371
1901
}
1372
1902
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1903
&mc->current_server->last_seen);
1374
1904
if(ret == -1){
1375
1905
perror_plus("clock_gettime");
1376
1906
return -1;
1377
1907
}
1378
mc.current_server = mc.current_server->next;
1908
mc->current_server = mc->current_server->next;
1379
1909
block_time = 0; /* Call avahi to find new Mandos
1380
1910
servers, but don't block */
1381
1911
}
1383
1913
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1914
}
1385
1915
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1916
if(ret > 0 or errno != EINTR){
1387
1917
return (ret != 1) ? ret : 0;
1388
1918
}
1389
1919
}
1390
1920
}
1391
1921
}
1392
1922
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1446
1925
const float delay){
1447
struct dirent **direntries;
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1929
| O_CLOEXEC);
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1932
if(debug){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1935
}
1936
} else {
1937
perror_plus("open");
1938
}
1939
return;
1940
}
1941
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1949
if(numhooks == -1){
1950
perror_plus("scandir");
1951
close(devnull);
1952
return;
1953
}
1448
1954
struct dirent *direntry;
1449
1955
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1958
if(debug){
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
direntry->d_name);
1460
1961
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1962
pid_t hook_pid = fork();
1963
if(hook_pid == 0){
1964
/* Child */
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1967
if(errno != 0){
1968
perror_plus("Failed to raise privileges");
1969
_exit(EX_NOPERM);
1970
}
1971
/* Set group */
1972
errno = 0;
1973
ret = setgid(0);
1974
if(ret == -1){
1975
perror_plus("setgid");
1976
_exit(EX_NOPERM);
1977
}
1978
/* Reset supplementary groups */
1979
errno = 0;
1980
ret = setgroups(0, NULL);
1981
if(ret == -1){
1982
perror_plus("setgroups");
1983
_exit(EX_NOPERM);
1984
}
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1986
if(ret == -1){
1987
perror_plus("setenv");
1988
_exit(EX_OSERR);
1989
}
1990
ret = setenv("DEVICE", interface, 1);
1991
if(ret == -1){
1992
perror_plus("setenv");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1996
if(ret == -1){
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
ret = setenv("MODE", mode, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
char *delaystring;
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2007
if(ret == -1){
1468
2008
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
2009
_exit(EX_OSERR);
2010
}
2011
ret = setenv("DELAY", delaystring, 1);
2012
if(ret == -1){
1527
2013
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
2014
perror_plus("setenv");
2015
_exit(EX_OSERR);
2016
}
2017
free(delaystring);
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2020
if(ret == -1){
2021
perror_plus("setenv");
2022
_exit(EX_OSERR);
2023
}
2024
}
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2026
direntry->d_name,
2027
O_RDONLY));
2028
if(hook_fd == -1){
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2031
}
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2035
}
2036
ret = dup2(devnull, STDIN_FILENO);
2037
if(ret == -1){
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
_exit(EX_OSERR);
2040
}
2041
ret = close(devnull);
2042
if(ret == -1){
2043
perror_plus("close");
2044
_exit(EX_OSERR);
2045
}
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2047
if(ret == -1){
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
_exit(EX_OSERR);
2050
}
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2052
environ) == -1){
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2055
}
2056
} else {
2057
if(hook_pid == -1){
2058
perror_plus("fork");
2059
free(direntry);
2060
continue;
2061
}
2062
int status;
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2065
free(direntry);
2066
continue;
2067
}
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2073
free(direntry);
2074
continue;
2075
}
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2079
WTERMSIG(status));
2080
free(direntry);
2081
continue;
1539
2082
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2085
free(direntry);
2086
continue;
2087
}
2088
}
2089
if(debug){
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
direntry->d_name);
2092
}
2093
free(direntry);
2094
}
2095
free(direntries);
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2098
} else {
2099
hookdir_fd = -1;
2100
}
2101
close(devnull);
1576
2102
}
1577
2103
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2108
int ret;
1584
2109
struct ifreq network;
1585
2110
unsigned int if_index = if_nametoindex(interface);
1586
2111
if(if_index == 0){
1595
2120
}
1596
2121
1597
2122
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
1599
2126
ret_errno = errno;
1600
2127
fprintf_plus(stderr, "Failed to get flags for interface "
1601
2128
"\"%s\"\n", interface);
2129
errno = old_errno;
1602
2130
return ret_errno;
1603
2131
}
1604
network.ifr_flags |= IFF_UP;
2132
network.ifr_flags |= IFF_UP; /* set flag */
1605
2133
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
if(sd == -1){
1608
2136
ret_errno = errno;
1609
2137
perror_plus("socket");
1610
2138
errno = old_errno;
1611
2139
return ret_errno;
1612
2140
}
1613
2141
1614
2142
if(quit_now){
1615
close(sd);
2143
ret = close(sd);
2144
if(ret == -1){
2145
perror_plus("close");
2146
}
1616
2147
errno = old_errno;
1617
2148
return EINTR;
1618
2149
}
1622
2153
interface);
1623
2154
}
1624
2155
1625
/* Raise priviliges */
1626
raise_privileges();
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2158
if(ret_errno != 0){
2159
errno = ret_errno;
2160
perror_plus("Failed to raise privileges");
2161
}
1627
2162
1628
2163
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
2164
int ret_linux;
2165
bool restore_loglevel = false;
2166
if(ret_errno == 0){
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2172
} else {
2173
restore_loglevel = true;
2174
}
1636
2175
}
1637
2176
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
1640
2179
#ifdef __linux__
1641
2180
if(restore_loglevel){
1642
2181
ret_linux = klogctl(7, NULL, 0);
1646
2185
}
1647
2186
#endif /* __linux__ */
1648
2187
1649
/* Lower privileges */
1650
lower_privileges();
2188
/* If raise_privileges() succeeded above */
2189
if(ret_errno == 0){
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2192
if(ret_errno != 0){
2193
errno = ret_errno;
2194
perror_plus("Failed to lower privileges");
2195
}
2196
}
1651
2197
1652
2198
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2199
ret = close(sd);
1654
2200
if(ret == -1){
1655
2201
perror_plus("close");
1656
2202
}
1657
2203
1658
2204
if(ret_setflags == -1){
1659
errno = ret_errno;
2205
errno = ioctl_errno;
1660
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
2207
errno = old_errno;
1662
return ret_errno;
2208
return ioctl_errno;
1663
2209
}
1664
2210
} else if(debug){
1665
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1668
2214
1669
2215
/* Sleep checking until interface is running.
1670
2216
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
2217
for(int i = 0; i < delay * 4; i++){
1672
2218
if(interface_is_running(interface)){
1673
2219
break;
1674
2220
}
1683
2229
return 0;
1684
2230
}
1685
2231
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
1691
2235
struct ifreq network;
1692
2236
unsigned int if_index = if_nametoindex(interface);
1693
2237
if(if_index == 0){
1696
2240
return ENXIO;
1697
2241
}
1698
2242
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
1699
2245
if(not get_flags(interface, &network) and debug){
1700
2246
ret_errno = errno;
1701
2247
fprintf_plus(stderr, "Failed to get flags for interface "
1702
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
1703
2250
return ret_errno;
1704
2251
}
1705
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
2253
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
1709
2256
ret_errno = errno;
1710
2257
perror_plus("socket");
1711
2258
errno = old_errno;
1717
2264
interface);
1718
2265
}
1719
2266
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2269
if(ret_errno != 0){
2270
errno = ret_errno;
2271
perror_plus("Failed to raise privileges");
2272
}
2273
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2276
2277
/* If raise_privileges() succeeded above */
2278
if(ret_errno == 0){
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("Failed to lower privileges");
2284
}
2285
}
1728
2286
1729
2287
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
int ret = close(sd);
1731
2289
if(ret == -1){
1732
2290
perror_plus("close");
1733
2291
}
1734
2292
1735
2293
if(ret_setflags == -1){
1736
errno = ret_errno;
2294
errno = ioctl_errno;
1737
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
2296
errno = old_errno;
1739
return ret_errno;
2297
return ioctl_errno;
1740
2298
}
1741
2299
} else if(debug){
1742
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
2306
}
1749
2307
1750
2308
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
1751
2314
AvahiSServiceBrowser *sb = NULL;
1752
2315
error_t ret_errno;
1753
2316
int ret;
1754
2317
intmax_t tmpmax;
1755
2318
char *tmp;
1756
2319
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
2320
char *interfaces_to_take_down = NULL;
1760
2321
size_t interfaces_to_take_down_size = 0;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
1763
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1764
2326
const char *seckey = PATHDIR "/" SECKEY;
1765
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
1766
2329
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1768
2330
1769
2331
bool gnutls_initialized = false;
1770
2332
bool gpgme_initialized = false;
1822
2384
.doc = "Bit length of the prime number used in the"
1823
2385
" Diffie-Hellman key exchange",
1824
2386
.group = 2 },
2387
{ .name = "dh-params", .key = 134,
2388
.arg = "FILE",
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2391
.group = 2 },
1825
2392
{ .name = "priority", .key = 130,
1826
2393
.arg = "STRING",
1827
2394
.doc = "GnuTLS priority string for the TLS handshake",
1861
2428
connect_to = arg;
1862
2429
break;
1863
2430
case 'i': /* --interface */
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2432
arg, (int)',');
1866
2433
if(ret_errno != 0){
1867
2434
argp_error(state, "%s", strerror(ret_errno));
1868
2435
}
1882
2449
}
1883
2450
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1884
2451
break;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2454
break;
1885
2455
case 130: /* --priority */
1886
2456
mc.priority = arg;
1887
2457
break;
1927
2497
.args_doc = "",
1928
2498
.doc = "Mandos client -- Get and decrypt"
1929
2499
" passwords from a Mandos server" };
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
1933
2503
case 0:
1934
2504
break;
1935
2505
case ENOMEM:
1936
2506
default:
1937
errno = ret;
2507
errno = ret_errno;
1938
2508
perror_plus("argp_parse");
1939
2509
exitcode = EX_OSERR;
1940
2510
goto end;
1943
2513
goto end;
1944
2514
}
1945
2515
}
1946
2516
1947
2517
{
1948
2518
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
2519
<https://bugs.debian.org/633582> */
1950
2520
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2525
perror_plus("Failed to raise privileges");
2526
} else {
1953
2527
struct stat st;
1954
2528
1955
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1969
2543
}
1970
2544
}
1971
2545
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2546
close(seckey_fd);
1973
2547
}
1974
2548
}
1975
2549
1976
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
2551
int pubkey_fd = open(pubkey, O_RDONLY);
1978
2552
if(pubkey_fd == -1){
1990
2564
}
1991
2565
}
1992
2566
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
2567
close(pubkey_fd);
2568
}
2569
}
2570
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2576
} else {
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2578
if(ret == -1){
2579
perror_plus("fstat");
2580
} else {
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2584
if(ret == -1){
2585
perror_plus("fchown");
2586
}
2587
}
2588
}
2589
close(dhparams_fd);
2590
}
2591
}
2592
1997
2593
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2597
perror_plus("Failed to lower privileges");
2002
2598
}
2003
2599
}
2004
2600
}
2005
2601
2006
/* Remove empty interface names */
2602
/* Remove invalid interface names (except "none") */
2007
2603
{
2008
2604
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2010
2606
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2013
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2014
2611
" \"%s\"\n", interface);
2015
2612
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2017
2614
interface = NULL;
2018
2615
}
2019
2616
}
2021
2618
2022
2619
/* Run network hooks */
2023
2620
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2027
2623
if(interfaces_hooks == NULL){
2028
2624
perror_plus("malloc");
2029
2625
goto end;
2030
2626
}
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2629
}
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
2040
2632
}
2041
2633
2042
2634
if(not debug){
2047
2639
from the signal handler */
2048
2640
/* Initialize the pseudo-RNG for Avahi */
2049
2641
srand((unsigned int) time(NULL));
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2052
2644
fprintf_plus(stderr,
2053
2645
"Avahi: Failed to create simple poll object.\n");
2054
2646
exitcode = EX_UNAVAILABLE;
2119
2711
}
2120
2712
2121
2713
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2124
2716
/* Look for any good interfaces */
2125
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2126
2718
alphasort);
2127
2719
if(ret >= 1){
2128
2720
/* Add all found interfaces to interfaces list */
2129
2721
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2131
2723
direntries[i]->d_name);
2132
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2133
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2134
2728
continue;
2135
2729
}
2136
2730
if(debug){
2137
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
2732
direntries[i]->d_name);
2139
2733
}
2734
free(direntries[i]);
2140
2735
}
2141
2736
free(direntries);
2142
2737
} else {
2143
free(direntries);
2738
if(ret == 0){
2739
free(direntries);
2740
}
2144
2741
fprintf_plus(stderr, "Could not find a network interface\n");
2145
2742
exitcode = EXIT_FAILURE;
2146
2743
goto end;
2147
2744
}
2148
2745
}
2149
2746
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2747
/* Bring up interfaces which are down, and remove any "none"s */
2748
{
2162
2749
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2164
2751
interface))){
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
interface);
2757
interface = NULL;
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2762
interface);
2763
interface = NULL;
2764
}
2765
}
2766
break;
2767
}
2165
2768
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2769
errno = bring_up_interface(interface, delay);
2167
2770
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2771
if(errno != 0){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2171
2774
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2777
interface);
2778
if(errno != 0){
2779
perror_plus("argz_add");
2780
}
2175
2781
}
2176
2782
}
2177
2783
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
2784
if(debug and (interfaces_to_take_down == NULL)){
2182
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
2786
}
2184
2787
}
2185
2788
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2791
if(debug){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
mc.interfaces);
2794
}
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2796
}
2797
2186
2798
if(quit_now){
2187
2799
goto end;
2188
2800
}
2189
2801
2190
ret = init_gnutls_global(pubkey, seckey);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2191
2803
if(ret == -1){
2192
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
2805
exitcode = EX_UNAVAILABLE;
2200
2812
goto end;
2201
2813
}
2202
2814
2203
if(mkdtemp(tempdir) == NULL){
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2818
if(debug){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2821
}
2822
tempdir = mkdtemp(old_tempdir);
2823
}
2824
if(tempdir == NULL){
2204
2825
perror_plus("mkdtemp");
2205
2826
goto end;
2206
2827
}
2207
tempdir_created = true;
2208
2828
2209
2829
if(quit_now){
2210
2830
goto end;
2211
2831
}
2212
2832
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2214
2834
fprintf_plus(stderr, "init_gpgme failed\n");
2215
2835
exitcode = EX_UNAVAILABLE;
2216
2836
goto end;
2246
2866
exitcode = EX_USAGE;
2247
2867
goto end;
2248
2868
}
2249
2869
2250
2870
if(quit_now){
2251
2871
goto end;
2252
2872
}
2273
2893
}
2274
2894
2275
2895
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
2896
ret = start_mandos_communication(address, port, if_index, af,
2897
&mc);
2277
2898
if(quit_now or ret == 0){
2278
2899
break;
2279
2900
}
2281
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
2903
(int)retry_interval);
2283
2904
}
2284
sleep((int)retry_interval);
2905
sleep((unsigned int)retry_interval);
2285
2906
}
2286
2907
2287
if (not quit_now){
2908
if(not quit_now){
2288
2909
exitcode = EXIT_SUCCESS;
2289
2910
}
2290
2911
2305
2926
config.publish_domain = 0;
2306
2927
2307
2928
/* Allocate a new server */
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2311
2931
2312
2932
/* Free the Avahi configuration data */
2313
2933
avahi_server_config_free(&config);
2316
2936
/* Check if creating the Avahi server object succeeded */
2317
2937
if(mc.server == NULL){
2318
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
2939
avahi_strerror(ret));
2320
2940
exitcode = EX_UNAVAILABLE;
2321
2941
goto end;
2322
2942
}
2328
2948
/* Create the Avahi service browser */
2329
2949
sb = avahi_s_service_browser_new(mc.server, if_index,
2330
2950
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2331
NULL, 0, browse_callback, NULL);
2951
NULL, 0, browse_callback,
2952
(void *)&mc);
2332
2953
if(sb == NULL){
2333
2954
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
2955
avahi_strerror(avahi_server_errno(mc.server)));
2345
2966
if(debug){
2346
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
2968
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2969
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2351
2972
if(debug){
2352
2973
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
2974
(ret == 0) ? "successfully" : "with error");
2356
2977
end:
2357
2978
2358
2979
if(debug){
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2360
2987
}
2361
2988
2362
2989
/* Cleanup things */
2990
free(mc.interfaces);
2991
2363
2992
if(sb != NULL)
2364
2993
avahi_s_service_browser_free(sb);
2365
2994
2366
2995
if(mc.server != NULL)
2367
2996
avahi_server_free(mc.server);
2368
2997
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
2371
3000
2372
3001
if(gnutls_initialized){
2373
3002
gnutls_certificate_free_credentials(mc.cred);
2374
gnutls_global_deinit();
2375
3003
gnutls_dh_params_deinit(mc.dh_params);
2376
3004
}
2377
3005
2385
3013
mc.current_server->prev->next = NULL;
2386
3014
while(mc.current_server != NULL){
2387
3015
server *next = mc.current_server->next;
3016
#ifdef __GNUC__
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3019
#endif
3020
free((char *)(mc.current_server->ip));
3021
#ifdef __GNUC__
3022
#pragma GCC diagnostic pop
3023
#endif
2388
3024
free(mc.current_server);
2389
3025
mc.current_server = next;
2390
3026
}
2391
3027
}
2392
3028
2393
/* Re-raise priviliges */
3029
/* Re-raise privileges */
2394
3030
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3034
perror_plus("Failed to raise privileges");
3035
} else {
3036
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3040
3041
/* Take down the network interfaces which were brought up */
3042
{
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to take down interface");
3051
}
3052
}
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3055
" down\n");
3056
}
3057
}
3058
}
3059
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3063
perror_plus("Failed to lower privileges permanently");
3064
}
2420
3065
}
2421
3066
2422
3067
free(interfaces_to_take_down);
2423
3068
free(interfaces_hooks);
2424
3069
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
2425
3124
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
2447
}
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2458
}
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
2459
3127
}
2460
3128
2461
3129
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0