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- Committer: Teddy Hogeborn
- Date: 2012-06-14 16:11:26 UTC
- mfrom: (594.1.4 client-all-interfaces)
- Revision ID: teddy@recompile.se-20120614161126-6xkpzbyddk3jm0zt
* plugins.d/mandos-client.c: Use all interfaces.
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
99
92
argz_delete(), argz_append(),
100
93
argz_stringify(), argz_add(),
101
94
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
95
105
96
#ifdef __linux__
106
97
#include <sys/klog.h> /* klogctl() */
148
139
static const char sys_class_net[] = "/sys/class/net";
149
140
char *connect_to = NULL;
150
141
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
142
uid_t uid = 65534;
153
143
gid_t gid = 65534;
154
144
155
145
/* Doubly linked list that need to be circularly linked when used */
156
146
typedef struct server{
157
147
const char *ip;
158
in_port_t port;
148
uint16_t port;
159
149
AvahiIfIndex if_index;
160
150
int af;
161
151
struct timespec last_seen;
165
155
166
156
/* Used for passing in values through the Avahi callback functions */
167
157
typedef struct {
158
AvahiSimplePoll *simple_poll;
168
159
AvahiServer *server;
169
160
gnutls_certificate_credentials_t cred;
170
161
unsigned int dh_bits;
172
163
const char *priority;
173
164
gpgme_ctx_t ctx;
174
165
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
166
} mandos_context;
178
167
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
181
173
182
174
sig_atomic_t quit_now = 0;
183
175
int signal_received = 0;
191
183
perror(print_text);
192
184
}
193
185
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
195
187
int fprintf_plus(FILE *stream, const char *format, ...){
196
188
va_list ap;
197
189
va_start (ap, format);
198
190
199
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
192
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
194
}
203
195
204
196
/*
206
198
* bytes. "buffer_capacity" is how much is currently allocated,
207
199
* "buffer_length" is how much is already used.
208
200
*/
209
__attribute__((nonnull, warn_unused_result))
210
201
size_t incbuffer(char **buffer, size_t buffer_length,
211
202
size_t buffer_capacity){
212
203
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;
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(buffer == NULL){
219
206
return 0;
220
207
}
221
*buffer = new_buf;
222
208
buffer_capacity += BUFFER_SIZE;
223
209
}
224
210
return buffer_capacity;
225
211
}
226
212
227
213
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
231
216
int ret;
232
217
server *new_server = malloc(sizeof(server));
233
218
if(new_server == NULL){
240
225
.af = af };
241
226
if(new_server->ip == NULL){
242
227
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
228
return false;
259
229
}
260
230
/* Special case of first server */
261
if(*current_server == NULL){
231
if (mc.current_server == NULL){
262
232
new_server->next = new_server;
263
233
new_server->prev = new_server;
264
*current_server = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
265
236
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
269
239
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
271
246
}
272
247
return true;
273
248
}
275
250
/*
276
251
* Initialize GPGME.
277
252
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
283
255
gpgme_error_t rc;
284
256
gpgme_engine_info_t engine_info;
285
257
258
286
259
/*
287
260
* Helper function to insert pub and seckey to the engine keyring.
288
261
*/
289
bool import_key(const char * const filename){
262
bool import_key(const char *filename){
290
263
int ret;
291
264
int fd;
292
265
gpgme_data_t pgp_data;
304
277
return false;
305
278
}
306
279
307
rc = gpgme_op_import(mc->ctx, pgp_data);
280
rc = gpgme_op_import(mc.ctx, pgp_data);
308
281
if(rc != GPG_ERR_NO_ERROR){
309
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
283
gpgme_strsource(rc), gpgme_strerror(rc));
311
284
return false;
312
285
}
313
286
314
ret = close(fd);
287
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
288
if(ret == -1){
316
289
perror_plus("close");
317
290
}
354
327
}
355
328
356
329
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
330
rc = gpgme_new(&(mc.ctx));
358
331
if(rc != GPG_ERR_NO_ERROR){
359
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
373
346
* Decrypt OpenPGP data.
374
347
* Returns -1 on error
375
348
*/
376
__attribute__((nonnull, warn_unused_result))
377
349
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
350
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
351
char **plaintext){
381
352
gpgme_data_t dh_crypto, dh_plain;
382
353
gpgme_error_t rc;
383
354
ssize_t ret;
409
380
410
381
/* Decrypt data from the cryptotext data buffer to the plaintext
411
382
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
384
if(rc != GPG_ERR_NO_ERROR){
414
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
386
gpgme_strsource(rc), gpgme_strerror(rc));
416
387
plaintext_length = -1;
417
388
if(debug){
418
389
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
390
result = gpgme_op_decrypt_result(mc.ctx);
420
391
if(result == NULL){
421
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
393
} else {
499
470
return plaintext_length;
500
471
}
501
472
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
476
if(ret == NULL)
477
ret = "(unknown)";
478
return ret;
513
479
}
514
480
515
481
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
482
static void debuggnutls(__attribute__((unused)) int level,
518
483
const char* string){
519
484
fprintf_plus(stderr, "GnuTLS: %s", string);
520
485
}
521
486
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
487
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
488
const char *seckeyfilename){
527
489
int ret;
528
unsigned int uret;
529
490
530
491
if(debug){
531
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
493
}
533
494
495
ret = gnutls_global_init();
496
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
499
return -1;
500
}
501
534
502
if(debug){
535
503
/* "Use a log level over 10 to enable all debugging options."
536
504
* - GnuTLS manual
540
508
}
541
509
542
510
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
512
if(ret != GNUTLS_E_SUCCESS){
545
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
514
safer_gnutls_strerror(ret));
515
gnutls_global_deinit();
547
516
return -1;
548
517
}
549
518
555
524
}
556
525
557
526
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
527
(mc.cred, pubkeyfilename, seckeyfilename,
559
528
GNUTLS_OPENPGP_FMT_BASE64);
560
529
if(ret != GNUTLS_E_SUCCESS){
561
530
fprintf_plus(stderr,
567
536
}
568
537
569
538
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
539
ret = gnutls_dh_params_init(&mc.dh_params);
571
540
if(ret != GNUTLS_E_SUCCESS){
572
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
542
" initialization: %s\n",
574
543
safer_gnutls_strerror(ret));
575
544
goto globalfail;
576
545
}
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
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
554
753
555
return 0;
754
556
755
557
globalfail:
756
558
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_dh_params_deinit(mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
759
562
return -1;
760
563
}
761
564
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
764
mandos_context *mc){
565
static int init_gnutls_session(gnutls_session_t *session){
765
566
int ret;
766
567
/* GnuTLS session creation */
767
568
do {
779
580
{
780
581
const char *err;
781
582
do {
782
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
584
if(quit_now){
784
585
gnutls_deinit(*session);
785
586
return -1;
796
597
797
598
do {
798
599
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
799
mc->cred);
600
mc.cred);
800
601
if(quit_now){
801
602
gnutls_deinit(*session);
802
603
return -1;
812
613
/* ignore client certificate if any. */
813
614
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
814
615
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
617
815
618
return 0;
816
619
}
817
620
819
622
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
623
__attribute__((unused)) const char *txt){}
821
624
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
625
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
626
static int start_mandos_communication(const char *ip, uint16_t port,
1043
627
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
628
int af){
1045
629
int ret, tcp_sd = -1;
1046
630
ssize_t sret;
1047
struct sockaddr_storage to;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
1048
635
char *buffer = NULL;
1049
636
char *decrypted_buffer = NULL;
1050
637
size_t buffer_length = 0;
1053
640
int retval = -1;
1054
641
gnutls_session_t session;
1055
642
int pf; /* Protocol family */
1056
bool route_added = false;
1057
643
1058
644
errno = 0;
1059
645
1075
661
return -1;
1076
662
}
1077
663
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
664
ret = init_gnutls_session(&session);
1112
665
if(ret != 0){
1113
666
return -1;
1114
667
}
1115
668
1116
669
if(debug){
1117
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
671
PRIu16 "\n", ip, port);
1119
672
}
1120
673
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
675
if(tcp_sd < 0){
1123
676
int e = errno;
1124
677
perror_plus("socket");
1131
684
goto mandos_end;
1132
685
}
1133
686
687
memset(&to, 0, sizeof(to));
1134
688
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
691
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
694
}
1143
695
if(ret < 0 ){
1144
696
int e = errno;
1153
705
goto mandos_end;
1154
706
}
1155
707
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
1159
715
if(if_index == AVAHI_IF_UNSPEC){
1160
716
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
717
" incomplete without a network interface\n");
1163
719
goto mandos_end;
1164
720
}
1165
721
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
722
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
723
}
1168
724
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
1170
728
}
1171
729
1172
730
if(quit_now){
1180
738
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
739
perror_plus("if_indextoname");
1182
740
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
1185
743
}
1186
744
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
1189
747
}
1190
748
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
749
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
750
const char *pcret;
751
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
754
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
757
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
760
} else {
761
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
}
764
}
765
}
766
767
if(quit_now){
768
errno = EINTR;
769
goto mandos_end;
770
}
771
772
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
774
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
}
777
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
783
goto mandos_end;
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
1272
789
}
1273
790
1274
791
const char *out = mandos_protocol_version;
1425
942
if(buffer_length > 0){
1426
943
ssize_t decrypted_buffer_size;
1427
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
945
&decrypted_buffer);
1429
946
if(decrypted_buffer_size >= 0){
1430
947
1431
clearerr(stdout);
1432
948
written = 0;
1433
949
while(written < (size_t) decrypted_buffer_size){
1434
950
if(quit_now){
1450
966
}
1451
967
written += (size_t)ret;
1452
968
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1463
969
retval = 0;
1464
970
}
1465
971
}
1468
974
1469
975
mandos_end:
1470
976
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
1477
977
int e = errno;
1478
978
free(decrypted_buffer);
1479
979
free(buffer);
1480
980
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1482
982
}
1483
983
if(ret == -1){
1484
984
if(e == 0){
1509
1009
AVAHI_GCC_UNUSED AvahiStringList *txt,
1510
1010
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1511
1011
flags,
1512
void *mc){
1513
if(r == NULL){
1514
return;
1515
}
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
1516
1014
1517
1015
/* Called whenever a service has been resolved successfully or
1518
1016
timed out */
1519
1017
1520
1018
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
1019
return;
1523
1020
}
1524
1021
1528
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1529
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1530
1027
domain,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
1028
avahi_strerror(avahi_server_errno(mc.server)));
1533
1029
break;
1534
1030
1535
1031
case AVAHI_RESOLVER_FOUND:
1541
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1542
1038
host_name, ip, (intmax_t)interface, port);
1543
1039
}
1544
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
interface,
1546
avahi_proto_to_af(proto),
1547
mc);
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1548
1042
if(ret == 0){
1549
avahi_simple_poll_quit(simple_poll);
1043
avahi_simple_poll_quit(mc.simple_poll);
1550
1044
} else {
1551
if(not add_server(ip, (in_port_t)port, interface,
1552
avahi_proto_to_af(proto),
1553
&((mandos_context*)mc)->current_server)){
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1554
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1555
1048
" list\n", name);
1556
1049
}
1569
1062
const char *domain,
1570
1063
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1571
1064
flags,
1572
void *mc){
1573
if(b == NULL){
1574
return;
1575
}
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
1576
1067
1577
1068
/* Called whenever a new services becomes available on the LAN or
1578
1069
is removed from the LAN */
1586
1077
case AVAHI_BROWSER_FAILURE:
1587
1078
1588
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1589
avahi_strerror(avahi_server_errno
1590
(((mandos_context*)mc)->server)));
1591
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1592
1082
return;
1593
1083
1594
1084
case AVAHI_BROWSER_NEW:
1597
1087
the callback function is called the Avahi server will free the
1598
1088
resolver for us. */
1599
1089
1600
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1601
interface, protocol, name, type,
1602
domain, protocol, 0,
1603
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1604
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1605
1094
" %s\n", name,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1608
1096
break;
1609
1097
1610
1098
case AVAHI_BROWSER_REMOVE:
1629
1117
signal_received = sig;
1630
1118
int old_errno = errno;
1631
1119
/* set main loop to exit */
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1634
1122
}
1635
1123
errno = old_errno;
1636
1124
}
1637
1125
1638
__attribute__((nonnull, warn_unused_result))
1639
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1127
int ret;
1641
int old_errno;
1128
error_t ret_errno;
1642
1129
1643
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1131
if(s < 0){
1645
old_errno = errno;
1132
ret_errno = errno;
1646
1133
perror_plus("socket");
1647
errno = old_errno;
1134
errno = ret_errno;
1648
1135
return false;
1649
1136
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1137
strcpy(ifr->ifr_name, ifname);
1652
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1139
if(ret == -1){
1654
1140
if(debug){
1655
old_errno = errno;
1141
ret_errno = errno;
1656
1142
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1143
errno = ret_errno;
1658
1144
}
1659
close(s);
1660
1145
return false;
1661
1146
}
1662
close(s);
1663
1147
return true;
1664
1148
}
1665
1149
1666
__attribute__((nonnull, warn_unused_result))
1667
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1668
1151
1669
1152
/* Reject the loopback device */
1711
1194
* corresponds to an acceptable network device.
1712
1195
* (This function is passed to scandir(3) as a filter function.)
1713
1196
*/
1714
__attribute__((nonnull, warn_unused_result))
1715
1197
int good_interface(const struct dirent *if_entry){
1716
1198
if(if_entry->d_name[0] == '.'){
1717
1199
return 0;
1735
1217
/*
1736
1218
* This function determines if a network interface is up.
1737
1219
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1220
bool interface_is_up(const char *interface){
1740
1221
struct ifreq ifr;
1741
1222
if(not get_flags(interface, &ifr)){
1752
1233
/*
1753
1234
* This function determines if a network interface is running
1754
1235
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
1236
bool interface_is_running(const char *interface){
1757
1237
struct ifreq ifr;
1758
1238
if(not get_flags(interface, &ifr)){
1766
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
1247
}
1768
1248
1769
__attribute__((nonnull, pure, warn_unused_result))
1770
1249
int notdotentries(const struct dirent *direntry){
1771
1250
/* Skip "." and ".." */
1772
1251
if(direntry->d_name[0] == '.'
1779
1258
}
1780
1259
1781
1260
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
1261
int runnable_hook(const struct dirent *direntry){
1784
1262
int ret;
1785
1263
size_t sret;
1793
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
1272
"abcdefghijklmnopqrstuvwxyz"
1795
1273
"0123456789"
1796
"_.-");
1274
"_-");
1797
1275
if((direntry->d_name)[sret] != '\0'){
1798
1276
/* Contains non-allowed characters */
1799
1277
if(debug){
1803
1281
return 0;
1804
1282
}
1805
1283
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1807
1292
if(ret == -1){
1808
1293
if(debug){
1809
1294
perror_plus("Could not stat hook");
1833
1318
return 1;
1834
1319
}
1835
1320
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1839
1322
int ret;
1840
1323
struct timespec now;
1841
1324
struct timespec waited_time;
1842
1325
intmax_t block_time;
1843
1326
1844
1327
while(true){
1845
if(mc->current_server == NULL){
1846
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1847
1330
fprintf_plus(stderr, "Wait until first server is found."
1848
1331
" No timeout!\n");
1849
1332
}
1850
1333
ret = avahi_simple_poll_iterate(s, -1);
1851
1334
} else {
1852
if(debug){
1335
if (debug){
1853
1336
fprintf_plus(stderr, "Check current_server if we should run"
1854
1337
" it, or wait\n");
1855
1338
}
1862
1345
/* Calculating in ms how long time between now and server
1863
1346
who we visted longest time ago. Now - last seen. */
1864
1347
waited_time.tv_sec = (now.tv_sec
1865
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1866
1349
waited_time.tv_nsec = (now.tv_nsec
1867
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1868
1351
/* total time is 10s/10,000ms.
1869
1352
Converting to s from ms by dividing by 1,000,
1870
1353
and ns to ms by dividing by 1,000,000. */
1872
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1873
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1874
1357
1875
if(debug){
1358
if (debug){
1876
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
1360
block_time);
1878
1361
}
1879
1362
1880
1363
if(block_time <= 0){
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
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);
1885
1368
if(ret == 0){
1886
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1887
1370
return 0;
1888
1371
}
1889
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1890
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1891
1374
if(ret == -1){
1892
1375
perror_plus("clock_gettime");
1893
1376
return -1;
1894
1377
}
1895
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1896
1379
block_time = 0; /* Call avahi to find new Mandos
1897
1380
servers, but don't block */
1898
1381
}
1900
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1901
1384
}
1902
1385
if(ret != 0){
1903
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1904
1387
return (ret != 1) ? ret : 0;
1905
1388
}
1906
1389
}
1907
1390
}
1908
1391
}
1909
1392
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
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,
1912
1446
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1936
1452
if(numhooks == -1){
1937
1453
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1948
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1995
1461
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
2000
1520
free(delaystring);
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
2069
1532
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
2089
1569
}
2090
1570
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
2096
1577
struct ifreq network;
2097
1578
unsigned int if_index = if_nametoindex(interface);
2098
1579
if(if_index == 0){
2107
1588
}
2108
1589
2109
1590
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
1591
if(not get_flags(interface, &network) and debug){
2113
1592
ret_errno = errno;
2114
1593
fprintf_plus(stderr, "Failed to get flags for interface "
2115
1594
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
1595
return ret_errno;
2118
1596
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
1597
network.ifr_flags |= IFF_UP;
2120
1598
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
2123
1601
ret_errno = errno;
2124
1602
perror_plus("socket");
2125
1603
errno = old_errno;
2126
1604
return ret_errno;
2127
1605
}
2128
1606
2129
1607
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
1608
close(sd);
2134
1609
errno = old_errno;
2135
1610
return EINTR;
2136
1611
}
2140
1615
interface);
2141
1616
}
2142
1617
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
1618
/* Raise priviliges */
1619
raise_privileges();
2149
1620
2150
1621
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
2162
1629
}
2163
1630
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
2166
1633
#ifdef __linux__
2167
1634
if(restore_loglevel){
2168
1635
ret_linux = klogctl(7, NULL, 0);
2172
1639
}
2173
1640
#endif /* __linux__ */
2174
1641
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
1642
/* Lower privileges */
1643
lower_privileges();
2184
1644
2185
1645
/* Close the socket */
2186
ret = close(sd);
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2187
1647
if(ret == -1){
2188
1648
perror_plus("close");
2189
1649
}
2190
1650
2191
1651
if(ret_setflags == -1){
2192
errno = ioctl_errno;
1652
errno = ret_errno;
2193
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
1654
errno = old_errno;
2195
return ioctl_errno;
1655
return ret_errno;
2196
1656
}
2197
1657
} else if(debug){
2198
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2201
1661
2202
1662
/* Sleep checking until interface is running.
2203
1663
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
1664
for(int i=0; i < delay * 4; i++){
2205
1665
if(interface_is_running(interface)){
2206
1666
break;
2207
1667
}
2216
1676
return 0;
2217
1677
}
2218
1678
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
2222
1684
struct ifreq network;
2223
1685
unsigned int if_index = if_nametoindex(interface);
2224
1686
if(if_index == 0){
2227
1689
return ENXIO;
2228
1690
}
2229
1691
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
1692
if(not get_flags(interface, &network) and debug){
2233
1693
ret_errno = errno;
2234
1694
fprintf_plus(stderr, "Failed to get flags for interface "
2235
1695
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
1696
return ret_errno;
2238
1697
}
2239
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
1699
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
2243
1702
ret_errno = errno;
2244
1703
perror_plus("socket");
2245
1704
errno = old_errno;
2251
1710
interface);
2252
1711
}
2253
1712
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
2273
1721
2274
1722
/* Close the socket */
2275
int ret = close(sd);
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2276
1724
if(ret == -1){
2277
1725
perror_plus("close");
2278
1726
}
2279
1727
2280
1728
if(ret_setflags == -1){
2281
errno = ioctl_errno;
1729
errno = ret_errno;
2282
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
1731
errno = old_errno;
2284
return ioctl_errno;
1732
return ret_errno;
2285
1733
}
2286
1734
} else if(debug){
2287
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2293
1741
}
2294
1742
2295
1743
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
2301
1744
AvahiSServiceBrowser *sb = NULL;
2302
1745
error_t ret_errno;
2303
1746
int ret;
2304
1747
intmax_t tmpmax;
2305
1748
char *tmp;
2306
1749
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
2307
1752
char *interfaces_to_take_down = NULL;
2308
1753
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
2312
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1757
const char *seckey = PATHDIR "/" SECKEY;
2314
1758
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
2317
1761
2318
1762
bool gnutls_initialized = false;
2319
1763
bool gpgme_initialized = false;
2371
1815
.doc = "Bit length of the prime number used in the"
2372
1816
" Diffie-Hellman key exchange",
2373
1817
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
2379
1818
{ .name = "priority", .key = 130,
2380
1819
.arg = "STRING",
2381
1820
.doc = "GnuTLS priority string for the TLS handshake",
2415
1854
connect_to = arg;
2416
1855
break;
2417
1856
case 'i': /* --interface */
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
2420
1859
if(ret_errno != 0){
2421
1860
argp_error(state, "%s", strerror(ret_errno));
2422
1861
}
2436
1875
}
2437
1876
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
1877
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
1878
case 130: /* --priority */
2443
1879
mc.priority = arg;
2444
1880
break;
2484
1920
.args_doc = "",
2485
1921
.doc = "Mandos client -- Get and decrypt"
2486
1922
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
2490
1926
case 0:
2491
1927
break;
2492
1928
case ENOMEM:
2493
1929
default:
2494
errno = ret_errno;
1930
errno = ret;
2495
1931
perror_plus("argp_parse");
2496
1932
exitcode = EX_OSERR;
2497
1933
goto end;
2500
1936
goto end;
2501
1937
}
2502
1938
}
2503
1939
2504
1940
{
2505
1941
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
1942
<http://bugs.debian.org/633582> */
2507
1943
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
2513
} else {
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2514
1946
struct stat st;
2515
1947
2516
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
1962
}
2531
1963
}
2532
1964
}
2533
close(seckey_fd);
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
2534
1966
}
2535
1967
}
2536
1968
2537
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
1970
int pubkey_fd = open(pubkey, O_RDONLY);
2539
1971
if(pubkey_fd == -1){
2551
1983
}
2552
1984
}
2553
1985
}
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
2580
1990
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2585
1995
}
2586
1996
}
2587
1997
}
2588
1998
2589
/* Remove invalid interface names (except "none") */
1999
/* Remove empty interface names */
2590
2000
{
2591
2001
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2002
while((interface = argz_next(interfaces, interfaces_size,
2593
2003
interface))){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2597
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2598
2007
" \"%s\"\n", interface);
2599
2008
}
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2009
argz_delete(&interfaces, &interfaces_size, interface);
2601
2010
interface = NULL;
2602
2011
}
2603
2012
}
2605
2014
2606
2015
/* Run network hooks */
2607
2016
{
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
2612
goto end;
2613
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2619
2028
}
2620
2029
2621
2030
if(not debug){
2626
2035
from the signal handler */
2627
2036
/* Initialize the pseudo-RNG for Avahi */
2628
2037
srand((unsigned int) time(NULL));
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2631
2040
fprintf_plus(stderr,
2632
2041
"Avahi: Failed to create simple poll object.\n");
2633
2042
exitcode = EX_UNAVAILABLE;
2698
2107
}
2699
2108
2700
2109
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2703
2112
/* Look for any good interfaces */
2704
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2705
2114
alphasort);
2706
2115
if(ret >= 1){
2707
2116
/* Add all found interfaces to interfaces list */
2708
2117
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2710
2119
direntries[i]->d_name);
2711
2120
if(ret_errno != 0){
2712
errno = ret_errno;
2713
2121
perror_plus("argz_add");
2714
free(direntries[i]);
2715
2122
continue;
2716
2123
}
2717
2124
if(debug){
2718
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
2126
direntries[i]->d_name);
2720
2127
}
2721
free(direntries[i]);
2722
2128
}
2723
2129
free(direntries);
2724
2130
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2131
free(direntries);
2728
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2729
2133
exitcode = EXIT_FAILURE;
2730
2134
goto end;
2731
2135
}
2732
2136
}
2733
2137
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2736
2150
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2151
while((interface = argz_next(interfaces, interfaces_size,
2738
2152
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
2751
}
2752
}
2753
break;
2754
}
2755
2153
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2154
ret = bring_up_interface(interface, delay);
2757
2155
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2761
2159
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2768
2163
}
2769
2164
}
2770
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2771
2169
if(debug and (interfaces_to_take_down == NULL)){
2772
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2773
2171
}
2774
2172
}
2775
2173
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2783
}
2784
2785
2174
if(quit_now){
2786
2175
goto end;
2787
2176
}
2788
2177
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2178
ret = init_gnutls_global(pubkey, seckey);
2790
2179
if(ret == -1){
2791
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
2181
exitcode = EX_UNAVAILABLE;
2799
2188
goto end;
2800
2189
}
2801
2190
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2191
if(mkdtemp(tempdir) == NULL){
2812
2192
perror_plus("mkdtemp");
2813
2193
goto end;
2814
2194
}
2195
tempdir_created = true;
2815
2196
2816
2197
if(quit_now){
2817
2198
goto end;
2818
2199
}
2819
2200
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2821
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2822
2203
exitcode = EX_UNAVAILABLE;
2823
2204
goto end;
2844
2225
goto end;
2845
2226
}
2846
2227
2847
in_port_t port;
2228
uint16_t port;
2848
2229
errno = 0;
2849
2230
tmpmax = strtoimax(address+1, &tmp, 10);
2850
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2851
or tmpmax != (in_port_t)tmpmax){
2232
or tmpmax != (uint16_t)tmpmax){
2852
2233
fprintf_plus(stderr, "Bad port number\n");
2853
2234
exitcode = EX_USAGE;
2854
2235
goto end;
2855
2236
}
2856
2237
2857
2238
if(quit_now){
2858
2239
goto end;
2859
2240
}
2860
2241
2861
port = (in_port_t)tmpmax;
2242
port = (uint16_t)tmpmax;
2862
2243
*address = '\0';
2863
2244
/* Colon in address indicates IPv6 */
2864
2245
int af;
2880
2261
}
2881
2262
2882
2263
while(not quit_now){
2883
ret = start_mandos_communication(address, port, if_index, af,
2884
&mc);
2264
ret = start_mandos_communication(address, port, if_index, af);
2885
2265
if(quit_now or ret == 0){
2886
2266
break;
2887
2267
}
2889
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2890
2270
(int)retry_interval);
2891
2271
}
2892
sleep((unsigned int)retry_interval);
2272
sleep((int)retry_interval);
2893
2273
}
2894
2274
2895
if(not quit_now){
2275
if (not quit_now){
2896
2276
exitcode = EXIT_SUCCESS;
2897
2277
}
2898
2278
2913
2293
config.publish_domain = 0;
2914
2294
2915
2295
/* Allocate a new server */
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2918
2299
2919
2300
/* Free the Avahi configuration data */
2920
2301
avahi_server_config_free(&config);
2923
2304
/* Check if creating the Avahi server object succeeded */
2924
2305
if(mc.server == NULL){
2925
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2307
avahi_strerror(ret_errno));
2927
2308
exitcode = EX_UNAVAILABLE;
2928
2309
goto end;
2929
2310
}
2935
2316
/* Create the Avahi service browser */
2936
2317
sb = avahi_s_service_browser_new(mc.server, if_index,
2937
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2938
NULL, 0, browse_callback,
2939
(void *)&mc);
2319
NULL, 0, browse_callback, NULL);
2940
2320
if(sb == NULL){
2941
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2942
2322
avahi_strerror(avahi_server_errno(mc.server)));
2953
2333
if(debug){
2954
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2955
2335
}
2956
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2959
2339
if(debug){
2960
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2961
2341
(ret == 0) ? "successfully" : "with error");
2964
2344
end:
2965
2345
2966
2346
if(debug){
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2348
}
2975
2349
2976
2350
/* Cleanup things */
2977
free(mc.interfaces);
2978
2979
2351
if(sb != NULL)
2980
2352
avahi_s_service_browser_free(sb);
2981
2353
2982
2354
if(mc.server != NULL)
2983
2355
avahi_server_free(mc.server);
2984
2356
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2987
2359
2988
2360
if(gnutls_initialized){
2989
2361
gnutls_certificate_free_credentials(mc.cred);
2362
gnutls_global_deinit();
2990
2363
gnutls_dh_params_deinit(mc.dh_params);
2991
2364
}
2992
2365
3000
2373
mc.current_server->prev->next = NULL;
3001
2374
while(mc.current_server != NULL){
3002
2375
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
3011
2376
free(mc.current_server);
3012
2377
mc.current_server = next;
3013
2378
}
3014
2379
}
3015
2380
3016
/* Re-raise privileges */
2381
/* Re-raise priviliges */
3017
2382
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
3045
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
3051
}
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
3052
2407
}
3053
2408
3054
2409
free(interfaces_to_take_down);
3055
2410
free(interfaces_hooks);
3056
2411
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
2412
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
3059
2414
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
3073
2419
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
3111
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
2434
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
2445
}
3114
2446
}
3115
2447
3116
2448
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0