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- Committer: Teddy Hogeborn
- Date: 2016-03-04 22:07:35 UTC
- Revision ID: teddy@recompile.se-20160304220735-4xeeqt5p4nhw5cuh
Restrict the Mandos server daemon in the systemd service file.
* mandos.service ([Service]/ProtectSystem): Set to "full".
([Service]/PrivateTmp, [Service]/PrivateDevices,
[Service]/ProtectHome): Set to "yes".
([Service]/CapabilityBoundingSet): Set to "CAP_SETUID
CAP_DAC_OVERRIDE CAP_NET_RAW".
* mandos.service ([Service]/ProtectSystem): Set to "full".
([Service]/PrivateTmp, [Service]/PrivateDevices,
[Service]/ProtectHome): Set to "yes".
([Service]/CapabilityBoundingSet): Set to "CAP_SETUID
CAP_DAC_OVERRIDE CAP_NET_RAW".
- files added:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
77
*/
74
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
79
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
78
83
#include <iso646.h> /* not, or, and */
79
84
#include <argp.h> /* struct argp_option, error_t, struct
80
85
argp_state, struct argp,
88
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
94
WEXITSTATUS(), WTERMSIG() */
90
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
91
102
92
103
#ifdef __linux__
93
104
#include <sys/klog.h> /* klogctl() */
135
146
static const char sys_class_net[] = "/sys/class/net";
136
147
char *connect_to = NULL;
137
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
uid_t uid = 65534;
151
gid_t gid = 65534;
138
152
139
153
/* Doubly linked list that need to be circularly linked when used */
140
154
typedef struct server{
141
155
const char *ip;
142
uint16_t port;
156
in_port_t port;
143
157
AvahiIfIndex if_index;
144
158
int af;
145
159
struct timespec last_seen;
149
163
150
164
/* Used for passing in values through the Avahi callback functions */
151
165
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
166
AvahiServer *server;
154
167
gnutls_certificate_credentials_t cred;
155
168
unsigned int dh_bits;
157
170
const char *priority;
158
171
gpgme_ctx_t ctx;
159
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
160
175
} mandos_context;
161
176
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
167
179
168
180
sig_atomic_t quit_now = 0;
169
181
int signal_received = 0;
170
182
171
183
/* Function to use when printing errors */
172
184
void perror_plus(const char *print_text){
185
int e = errno;
173
186
fprintf(stderr, "Mandos plugin %s: ",
174
187
program_invocation_short_name);
188
errno = e;
175
189
perror(print_text);
176
190
}
177
191
178
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
179
193
int fprintf_plus(FILE *stream, const char *format, ...){
180
194
va_list ap;
181
195
va_start (ap, format);
182
196
183
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
198
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
200
}
187
201
188
202
/*
190
204
* bytes. "buffer_capacity" is how much is currently allocated,
191
205
* "buffer_length" is how much is already used.
192
206
*/
207
__attribute__((nonnull, warn_unused_result))
193
208
size_t incbuffer(char **buffer, size_t buffer_length,
194
209
size_t buffer_capacity){
195
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
198
217
return 0;
199
218
}
219
*buffer = new_buf;
200
220
buffer_capacity += BUFFER_SIZE;
201
221
}
202
222
return buffer_capacity;
203
223
}
204
224
205
225
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
208
229
int ret;
209
230
server *new_server = malloc(sizeof(server));
210
231
if(new_server == NULL){
217
238
.af = af };
218
239
if(new_server->ip == NULL){
219
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
220
256
return false;
221
257
}
222
258
/* Special case of first server */
223
if (mc.current_server == NULL){
259
if(*current_server == NULL){
224
260
new_server->next = new_server;
225
261
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
262
*current_server = new_server;
228
263
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
231
267
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
268
(*current_server)->prev = new_server;
238
269
}
239
270
return true;
240
271
}
242
273
/*
243
274
* Initialize GPGME.
244
275
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
247
281
gpgme_error_t rc;
248
282
gpgme_engine_info_t engine_info;
249
283
250
251
284
/*
252
285
* Helper function to insert pub and seckey to the engine keyring.
253
286
*/
254
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
255
288
int ret;
256
289
int fd;
257
290
gpgme_data_t pgp_data;
269
302
return false;
270
303
}
271
304
272
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
273
306
if(rc != GPG_ERR_NO_ERROR){
274
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
308
gpgme_strsource(rc), gpgme_strerror(rc));
276
309
return false;
277
310
}
278
311
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
280
313
if(ret == -1){
281
314
perror_plus("close");
282
315
}
319
352
}
320
353
321
354
/* Create new GPGME "context" */
322
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
323
356
if(rc != GPG_ERR_NO_ERROR){
324
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
371
* Decrypt OpenPGP data.
339
372
* Returns -1 on error
340
373
*/
374
__attribute__((nonnull, warn_unused_result))
341
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
376
size_t crypto_size,
343
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
344
379
gpgme_data_t dh_crypto, dh_plain;
345
380
gpgme_error_t rc;
346
381
ssize_t ret;
372
407
373
408
/* Decrypt data from the cryptotext data buffer to the plaintext
374
409
data buffer */
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
376
411
if(rc != GPG_ERR_NO_ERROR){
377
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
413
gpgme_strsource(rc), gpgme_strerror(rc));
379
414
plaintext_length = -1;
380
415
if(debug){
381
416
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
383
418
if(result == NULL){
384
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
420
} else {
462
497
return plaintext_length;
463
498
}
464
499
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
468
if(ret == NULL)
469
ret = "(unknown)";
470
return ret;
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
471
511
}
472
512
473
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
474
515
static void debuggnutls(__attribute__((unused)) int level,
475
516
const char* string){
476
517
fprintf_plus(stderr, "GnuTLS: %s", string);
477
518
}
478
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
479
521
static int init_gnutls_global(const char *pubkeyfilename,
480
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
481
525
int ret;
526
unsigned int uret;
482
527
483
528
if(debug){
484
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
485
530
}
486
531
487
ret = gnutls_global_init();
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
491
return -1;
492
}
493
494
532
if(debug){
495
533
/* "Use a log level over 10 to enable all debugging options."
496
534
* - GnuTLS manual
500
538
}
501
539
502
540
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
504
542
if(ret != GNUTLS_E_SUCCESS){
505
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
544
safer_gnutls_strerror(ret));
507
gnutls_global_deinit();
508
545
return -1;
509
546
}
510
547
516
553
}
517
554
518
555
ret = gnutls_certificate_set_openpgp_key_file
519
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
520
557
GNUTLS_OPENPGP_FMT_BASE64);
521
558
if(ret != GNUTLS_E_SUCCESS){
522
559
fprintf_plus(stderr,
528
565
}
529
566
530
567
/* GnuTLS server initialization */
531
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
532
569
if(ret != GNUTLS_E_SUCCESS){
533
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
571
" initialization: %s\n",
535
572
safer_gnutls_strerror(ret));
536
573
goto globalfail;
537
574
}
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
542
goto globalfail;
543
}
544
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
546
748
547
749
return 0;
548
750
549
751
globalfail:
550
752
551
gnutls_certificate_free_credentials(mc.cred);
552
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
554
755
return -1;
555
756
}
556
757
557
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
558
761
int ret;
559
762
/* GnuTLS session creation */
560
763
do {
572
775
{
573
776
const char *err;
574
777
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
576
779
if(quit_now){
577
780
gnutls_deinit(*session);
578
781
return -1;
589
792
590
793
do {
591
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
795
mc->cred);
593
796
if(quit_now){
594
797
gnutls_deinit(*session);
595
798
return -1;
605
808
/* ignore client certificate if any. */
606
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
607
810
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
609
610
811
return 0;
611
812
}
612
813
614
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
615
816
__attribute__((unused)) const char *txt){}
616
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
617
1036
/* Called when a Mandos server is found */
618
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
619
1039
AvahiIfIndex if_index,
620
int af){
1040
int af, mandos_context *mc){
621
1041
int ret, tcp_sd = -1;
622
1042
ssize_t sret;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
1043
struct sockaddr_storage to;
627
1044
char *buffer = NULL;
628
1045
char *decrypted_buffer = NULL;
629
1046
size_t buffer_length = 0;
632
1049
int retval = -1;
633
1050
gnutls_session_t session;
634
1051
int pf; /* Protocol family */
1052
bool route_added = false;
635
1053
636
1054
errno = 0;
637
1055
653
1071
return -1;
654
1072
}
655
1073
656
ret = init_gnutls_session(&session);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
657
1107
if(ret != 0){
658
1108
return -1;
659
1109
}
660
1110
661
1111
if(debug){
662
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
1113
PRIuMAX "\n", ip, (uintmax_t)port);
664
1114
}
665
1115
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
667
1117
if(tcp_sd < 0){
668
1118
int e = errno;
669
1119
perror_plus("socket");
676
1126
goto mandos_end;
677
1127
}
678
1128
679
memset(&to, 0, sizeof(to));
680
1129
if(af == AF_INET6){
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
683
1133
} else { /* IPv4 */
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
686
1137
}
687
1138
if(ret < 0 ){
688
1139
int e = errno;
697
1148
goto mandos_end;
698
1149
}
699
1150
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
707
1154
if(if_index == AVAHI_IF_UNSPEC){
708
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
709
1156
" incomplete without a network interface\n");
711
1158
goto mandos_end;
712
1159
}
713
1160
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
715
1162
}
716
1163
} else {
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
1165
}
721
1166
722
1167
if(quit_now){
730
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
1176
perror_plus("if_indextoname");
732
1177
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
735
1180
}
736
1181
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
739
1184
}
740
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
752
} else {
753
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
756
}
757
}
758
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
769
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
781
1267
}
782
1268
783
1269
const char *out = mandos_protocol_version;
819
1305
goto mandos_end;
820
1306
}
821
1307
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
1313
825
1314
if(quit_now){
826
1315
errno = EINTR;
931
1420
if(buffer_length > 0){
932
1421
ssize_t decrypted_buffer_size;
933
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
&decrypted_buffer);
1423
&decrypted_buffer, mc);
935
1424
if(decrypted_buffer_size >= 0){
936
1425
937
1426
written = 0;
963
1452
964
1453
mandos_end:
965
1454
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
966
1461
int e = errno;
967
1462
free(decrypted_buffer);
968
1463
free(buffer);
969
1464
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
971
1466
}
972
1467
if(ret == -1){
973
1468
if(e == 0){
985
1480
return retval;
986
1481
}
987
1482
1483
__attribute__((nonnull))
988
1484
static void resolve_callback(AvahiSServiceResolver *r,
989
1485
AvahiIfIndex interface,
990
1486
AvahiProtocol proto,
998
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
1496
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
1003
1501
1004
1502
/* Called whenever a service has been resolved successfully or
1005
1503
timed out */
1006
1504
1007
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1008
1507
return;
1009
1508
}
1010
1509
1014
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
1515
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
1018
1518
break;
1019
1519
1020
1520
case AVAHI_RESOLVER_FOUND:
1026
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
1527
host_name, ip, (intmax_t)interface, port);
1028
1528
}
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
1031
1533
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1534
avahi_simple_poll_quit(simple_poll);
1033
1535
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1036
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
1540
" list\n", name);
1038
1541
}
1051
1554
const char *domain,
1052
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
1556
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
1056
1561
1057
1562
/* Called whenever a new services becomes available on the LAN or
1058
1563
is removed from the LAN */
1066
1571
case AVAHI_BROWSER_FAILURE:
1067
1572
1068
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
1071
1577
return;
1072
1578
1073
1579
case AVAHI_BROWSER_NEW:
1076
1582
the callback function is called the Avahi server will free the
1077
1583
resolver for us. */
1078
1584
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1082
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
1590
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1085
1593
break;
1086
1594
1087
1595
case AVAHI_BROWSER_REMOVE:
1106
1614
signal_received = sig;
1107
1615
int old_errno = errno;
1108
1616
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1111
1619
}
1112
1620
errno = old_errno;
1113
1621
}
1114
1622
1623
__attribute__((nonnull, warn_unused_result))
1115
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
1625
int ret;
1626
error_t ret_errno;
1117
1627
1118
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
1629
if(s < 0){
1630
ret_errno = errno;
1120
1631
perror_plus("socket");
1632
errno = ret_errno;
1121
1633
return false;
1122
1634
}
1123
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1124
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
1638
if(ret == -1){
1126
1639
if(debug){
1640
ret_errno = errno;
1127
1641
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = ret_errno;
1128
1643
}
1129
1644
return false;
1130
1645
}
1131
1646
return true;
1132
1647
}
1133
1648
1649
__attribute__((nonnull, warn_unused_result))
1134
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1651
1136
1652
/* Reject the loopback device */
1178
1694
* corresponds to an acceptable network device.
1179
1695
* (This function is passed to scandir(3) as a filter function.)
1180
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1181
1698
int good_interface(const struct dirent *if_entry){
1182
1699
if(if_entry->d_name[0] == '.'){
1183
1700
return 0;
1199
1716
}
1200
1717
1201
1718
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1719
* This function determines if a network interface is up.
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1723
struct ifreq ifr;
1724
if(not get_flags(interface, &ifr)){
1725
if(debug){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1728
}
1729
return false;
1730
}
1731
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1733
}
1734
1735
/*
1736
* This function determines if a network interface is running
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
}
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1244
1753
int notdotentries(const struct dirent *direntry){
1245
1754
/* Skip "." and ".." */
1246
1755
if(direntry->d_name[0] == '.'
1253
1762
}
1254
1763
1255
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1256
1766
int runnable_hook(const struct dirent *direntry){
1257
1767
int ret;
1258
1768
size_t sret;
1266
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
1777
"abcdefghijklmnopqrstuvwxyz"
1268
1778
"0123456789"
1269
"_-");
1779
"_.-");
1270
1780
if((direntry->d_name)[sret] != '\0'){
1271
1781
/* Contains non-allowed characters */
1272
1782
if(debug){
1276
1786
return 0;
1277
1787
}
1278
1788
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1287
1790
if(ret == -1){
1288
1791
if(debug){
1289
1792
perror_plus("Could not stat hook");
1313
1816
return 1;
1314
1817
}
1315
1818
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1317
1822
int ret;
1318
1823
struct timespec now;
1319
1824
struct timespec waited_time;
1320
1825
intmax_t block_time;
1321
1826
1322
1827
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1828
if(mc->current_server == NULL){
1829
if(debug){
1325
1830
fprintf_plus(stderr, "Wait until first server is found."
1326
1831
" No timeout!\n");
1327
1832
}
1328
1833
ret = avahi_simple_poll_iterate(s, -1);
1329
1834
} else {
1330
if (debug){
1835
if(debug){
1331
1836
fprintf_plus(stderr, "Check current_server if we should run"
1332
1837
" it, or wait\n");
1333
1838
}
1340
1845
/* Calculating in ms how long time between now and server
1341
1846
who we visted longest time ago. Now - last seen. */
1342
1847
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1848
- mc->current_server->last_seen.tv_sec);
1344
1849
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1850
- mc->current_server->last_seen.tv_nsec);
1346
1851
/* total time is 10s/10,000ms.
1347
1852
Converting to s from ms by dividing by 1,000,
1348
1853
and ns to ms by dividing by 1,000,000. */
1350
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1351
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1857
1353
if (debug){
1858
if(debug){
1354
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
1860
block_time);
1356
1861
}
1357
1862
1358
1863
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1363
1868
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1869
avahi_simple_poll_quit(s);
1365
1870
return 0;
1366
1871
}
1367
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1873
&mc->current_server->last_seen);
1369
1874
if(ret == -1){
1370
1875
perror_plus("clock_gettime");
1371
1876
return -1;
1372
1877
}
1373
mc.current_server = mc.current_server->next;
1878
mc->current_server = mc->current_server->next;
1374
1879
block_time = 0; /* Call avahi to find new Mandos
1375
1880
servers, but don't block */
1376
1881
}
1378
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
1884
}
1380
1885
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1382
1887
return (ret != 1) ? ret : 0;
1383
1888
}
1384
1889
}
1385
1890
}
1386
1891
}
1387
1892
1388
bool run_network_hooks(const char *mode, const char *interface,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1389
1895
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1395
1914
if(numhooks == -1){
1396
1915
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1404
1977
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1473
1982
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
2051
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
2071
}
2072
2073
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2075
const float delay){
2076
error_t old_errno = errno;
2077
int ret;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2080
if(if_index == 0){
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2082
errno = old_errno;
2083
return ENXIO;
2084
}
2085
2086
if(quit_now){
2087
errno = old_errno;
2088
return EINTR;
2089
}
2090
2091
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
2094
ret_errno = errno;
2095
fprintf_plus(stderr, "Failed to get flags for interface "
2096
"\"%s\"\n", interface);
2097
errno = old_errno;
2098
return ret_errno;
2099
}
2100
network.ifr_flags |= IFF_UP; /* set flag */
2101
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
2104
ret_errno = errno;
2105
perror_plus("socket");
2106
errno = old_errno;
2107
return ret_errno;
2108
}
2109
2110
if(quit_now){
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
2115
errno = old_errno;
2116
return EINTR;
2117
}
2118
2119
if(debug){
2120
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2121
interface);
2122
}
2123
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
2130
2131
#ifdef __linux__
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
2143
}
2144
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
2147
#ifdef __linux__
2148
if(restore_loglevel){
2149
ret_linux = klogctl(7, NULL, 0);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
}
2153
}
2154
#endif /* __linux__ */
2155
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
2165
2166
/* Close the socket */
2167
ret = close(sd);
2168
if(ret == -1){
2169
perror_plus("close");
2170
}
2171
2172
if(ret_setflags == -1){
2173
errno = ioctl_errno;
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
errno = old_errno;
2176
return ioctl_errno;
2177
}
2178
} else if(debug){
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2180
interface);
2181
}
2182
2183
/* Sleep checking until interface is running.
2184
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2186
if(interface_is_running(interface)){
2187
break;
2188
}
2189
struct timespec sleeptime = { .tv_nsec = 250000000 };
2190
ret = nanosleep(&sleeptime, NULL);
2191
if(ret == -1 and errno != EINTR){
2192
perror_plus("nanosleep");
2193
}
2194
}
2195
2196
errno = old_errno;
2197
return 0;
2198
}
2199
2200
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2203
struct ifreq network;
2204
unsigned int if_index = if_nametoindex(interface);
2205
if(if_index == 0){
2206
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2207
errno = old_errno;
2208
return ENXIO;
2209
}
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
if(not get_flags(interface, &network) and debug){
2213
ret_errno = errno;
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2215
"\"%s\"\n", interface);
2216
errno = old_errno;
2217
return ret_errno;
2218
}
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2220
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
2223
ret_errno = errno;
2224
perror_plus("socket");
2225
errno = old_errno;
2226
return ret_errno;
2227
}
2228
2229
if(debug){
2230
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2231
interface);
2232
}
2233
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
2240
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2243
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
2253
2254
/* Close the socket */
2255
int ret = close(sd);
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
2260
if(ret_setflags == -1){
2261
errno = ioctl_errno;
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
errno = old_errno;
2264
return ioctl_errno;
2265
}
2266
} else if(debug){
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2268
interface);
2269
}
2270
2271
errno = old_errno;
2272
return 0;
1515
2273
}
1516
2274
1517
2275
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
1518
2281
AvahiSServiceBrowser *sb = NULL;
1519
int error;
2282
error_t ret_errno;
1520
2283
int ret;
1521
2284
intmax_t tmpmax;
1522
2285
char *tmp;
1523
2286
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
2287
char *interfaces_to_take_down = NULL;
2288
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1532
2292
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
2293
const char *seckey = PATHDIR "/" SECKEY;
1534
2294
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
1535
2297
1536
2298
bool gnutls_initialized = false;
1537
2299
bool gpgme_initialized = false;
1589
2351
.doc = "Bit length of the prime number used in the"
1590
2352
" Diffie-Hellman key exchange",
1591
2353
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
1592
2359
{ .name = "priority", .key = 130,
1593
2360
.arg = "STRING",
1594
2361
.doc = "GnuTLS priority string for the TLS handshake",
1599
2366
.group = 2 },
1600
2367
{ .name = "retry", .key = 132,
1601
2368
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
2369
.doc = "Retry interval used when denied by the Mandos server",
1603
2370
.group = 2 },
1604
2371
{ .name = "network-hook-dir", .key = 133,
1605
2372
.arg = "DIR",
1628
2395
connect_to = arg;
1629
2396
break;
1630
2397
case 'i': /* --interface */
1631
interface = arg;
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2399
arg, (int)',');
2400
if(ret_errno != 0){
2401
argp_error(state, "%s", strerror(ret_errno));
2402
}
1632
2403
break;
1633
2404
case 's': /* --seckey */
1634
2405
seckey = arg;
1645
2416
}
1646
2417
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1647
2418
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
1648
2422
case 130: /* --priority */
1649
2423
mc.priority = arg;
1650
2424
break;
1706
2480
goto end;
1707
2481
}
1708
2482
}
1709
2483
1710
2484
{
1711
2485
/* Work around Debian bug #633582:
1712
2486
<http://bugs.debian.org/633582> */
1713
2487
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
1719
2493
} else {
1720
2494
struct stat st;
1721
2495
1736
2510
}
1737
2511
}
1738
2512
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
2513
close(seckey_fd);
1740
2514
}
1741
2515
}
1742
2516
1743
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
2518
int pubkey_fd = open(pubkey, O_RDONLY);
1745
2519
if(pubkey_fd == -1){
1757
2531
}
1758
2532
}
1759
2533
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
1764
2560
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2565
}
2566
}
2567
}
2568
2569
/* Remove invalid interface names (except "none") */
2570
{
2571
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2573
interface))){
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2578
" \"%s\"\n", interface);
2579
}
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2581
interface = NULL;
1769
2582
}
1770
2583
}
1771
2584
}
1772
2585
1773
2586
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2587
{
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2590
if(interfaces_hooks == NULL){
2591
perror_plus("malloc");
2592
goto end;
2593
}
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
1776
2599
}
1777
2600
1778
2601
if(not debug){
1779
2602
avahi_set_log_function(empty_log);
1780
2603
}
1781
2604
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1814
2605
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
2606
from the signal handler */
1816
2607
/* Initialize the pseudo-RNG for Avahi */
1817
2608
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2609
simple_poll = avahi_simple_poll_new();
2610
if(simple_poll == NULL){
1820
2611
fprintf_plus(stderr,
1821
2612
"Avahi: Failed to create simple poll object.\n");
1822
2613
exitcode = EX_UNAVAILABLE;
1886
2677
}
1887
2678
}
1888
2679
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
2680
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2683
/* Look for any good interfaces */
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2685
alphasort);
2686
if(ret >= 1){
2687
/* Add all found interfaces to interfaces list */
2688
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2690
direntries[i]->d_name);
2691
if(ret_errno != 0){
2692
errno = ret_errno;
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2695
continue;
2696
}
2697
if(debug){
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
direntries[i]->d_name);
2700
}
2701
free(direntries[i]);
2702
}
2703
free(direntries);
2704
} else {
2705
if(ret == 0){
2706
free(direntries);
2707
}
2708
fprintf_plus(stderr, "Could not find a network interface\n");
2709
exitcode = EXIT_FAILURE;
2710
goto end;
2711
}
2712
}
2713
2714
/* Bring up interfaces which are down, and remove any "none"s */
2715
{
2716
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2718
interface))){
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2723
interface);
2724
interface = NULL;
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2729
interface);
2730
interface = NULL;
1974
2731
}
1975
2732
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1993
2733
break;
1994
2734
}
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2735
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2737
if(not interface_was_up){
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2741
} else {
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
if(errno != 0){
2746
perror_plus("argz_add");
2747
}
2748
}
2749
}
2750
}
2751
if(debug and (interfaces_to_take_down == NULL)){
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2753
}
2754
}
2755
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2758
if(debug){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2760
mc.interfaces);
2761
}
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2024
2763
}
2025
2764
2026
2765
if(quit_now){
2027
2766
goto end;
2028
2767
}
2029
2768
2030
ret = init_gnutls_global(pubkey, seckey);
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2031
2770
if(ret == -1){
2032
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2772
exitcode = EX_UNAVAILABLE;
2040
2779
goto end;
2041
2780
}
2042
2781
2043
if(mkdtemp(tempdir) == NULL){
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
2044
2792
perror_plus("mkdtemp");
2045
2793
goto end;
2046
2794
}
2047
tempdir_created = true;
2048
2795
2049
2796
if(quit_now){
2050
2797
goto end;
2051
2798
}
2052
2799
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2800
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2054
2801
fprintf_plus(stderr, "init_gpgme failed\n");
2055
2802
exitcode = EX_UNAVAILABLE;
2056
2803
goto end;
2066
2813
/* Connect directly, do not use Zeroconf */
2067
2814
/* (Mainly meant for debugging) */
2068
2815
char *address = strrchr(connect_to, ':');
2816
2069
2817
if(address == NULL){
2070
2818
fprintf_plus(stderr, "No colon in address\n");
2071
2819
exitcode = EX_USAGE;
2076
2824
goto end;
2077
2825
}
2078
2826
2079
uint16_t port;
2827
in_port_t port;
2080
2828
errno = 0;
2081
2829
tmpmax = strtoimax(address+1, &tmp, 10);
2082
2830
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2831
or tmpmax != (in_port_t)tmpmax){
2084
2832
fprintf_plus(stderr, "Bad port number\n");
2085
2833
exitcode = EX_USAGE;
2086
2834
goto end;
2087
2835
}
2088
2836
2089
2837
if(quit_now){
2090
2838
goto end;
2091
2839
}
2092
2840
2093
port = (uint16_t)tmpmax;
2841
port = (in_port_t)tmpmax;
2094
2842
*address = '\0';
2095
2843
/* Colon in address indicates IPv6 */
2096
2844
int af;
2112
2860
}
2113
2861
2114
2862
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2863
ret = start_mandos_communication(address, port, if_index, af,
2864
&mc);
2116
2865
if(quit_now or ret == 0){
2117
2866
break;
2118
2867
}
2120
2869
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
2870
(int)retry_interval);
2122
2871
}
2123
sleep((int)retry_interval);
2872
sleep((unsigned int)retry_interval);
2124
2873
}
2125
2874
2126
if (not quit_now){
2875
if(not quit_now){
2127
2876
exitcode = EXIT_SUCCESS;
2128
2877
}
2129
2878
2144
2893
config.publish_domain = 0;
2145
2894
2146
2895
/* Allocate a new server */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2896
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2897
&config, NULL, NULL, &ret_errno);
2150
2898
2151
2899
/* Free the Avahi configuration data */
2152
2900
avahi_server_config_free(&config);
2155
2903
/* Check if creating the Avahi server object succeeded */
2156
2904
if(mc.server == NULL){
2157
2905
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2906
avahi_strerror(ret_errno));
2159
2907
exitcode = EX_UNAVAILABLE;
2160
2908
goto end;
2161
2909
}
2167
2915
/* Create the Avahi service browser */
2168
2916
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
2917
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2918
NULL, 0, browse_callback,
2919
(void *)&mc);
2171
2920
if(sb == NULL){
2172
2921
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
2922
avahi_strerror(avahi_server_errno(mc.server)));
2184
2933
if(debug){
2185
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
2935
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2936
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
2190
2939
if(debug){
2191
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
2941
(ret == 0) ? "successfully" : "with error");
2199
2948
}
2200
2949
2201
2950
/* Cleanup things */
2951
free(mc.interfaces);
2952
2202
2953
if(sb != NULL)
2203
2954
avahi_s_service_browser_free(sb);
2204
2955
2205
2956
if(mc.server != NULL)
2206
2957
avahi_server_free(mc.server);
2207
2958
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
2210
2961
2211
2962
if(gnutls_initialized){
2212
2963
gnutls_certificate_free_credentials(mc.cred);
2213
gnutls_global_deinit();
2214
2964
gnutls_dh_params_deinit(mc.dh_params);
2215
2965
}
2216
2966
2224
2974
mc.current_server->prev->next = NULL;
2225
2975
while(mc.current_server != NULL){
2226
2976
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2227
2985
free(mc.current_server);
2228
2986
mc.current_server = next;
2229
2987
}
2230
2988
}
2231
2989
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2990
/* Re-raise privileges */
2236
2991
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
2241
3019
}
2242
3020
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
2259
3025
}
2260
3026
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
3027
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3030
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
3033
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
2266
3085
}
2267
3086
2268
3087
/* Removes the GPGME temp directory and all files inside */
2269
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
2290
}
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2301
}
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
2302
3090
}
2303
3091
2304
3092
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0