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- Committer: Teddy Hogeborn
- Date: 2015-07-20 03:03:33 UTC
- Revision ID: teddy@recompile.se-20150720030333-203m2aeblypcsfte
Bug fix for GnuTLS 3: be compatible with old 2048-bit DSA keys.
The mandos-keygen program in Mandos version 1.6.0 and older generated
2048-bit DSA keys, and when GnuTLS uses these it has trouble
connecting using the Mandos default priority string. This was
previously fixed in Mandos 1.6.2, but the bug reappeared when using
GnuTLS 3, so the default priority string has to change again; this
time also the Mandos client has to change its default, so now the
server and the client should use the same default priority string:
SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256
* mandos (main/server_defaults): Changed default priority string.
* mandos-options.xml (/section/para[id="priority_compat"]): Removed.
(/section/para[id="priority"]): Changed default priority string.
* mandos.conf ([DEFAULT]/priority): - '' -
* mandos.conf.xml (OPTIONS/priority): Refer to the id "priority"
instead of "priority_compat".
* mandos.xml (OPTIONS/--priority): - '' -
* plugins.d/mandos-client.c (main): Changed default priority string.
The mandos-keygen program in Mandos version 1.6.0 and older generated
2048-bit DSA keys, and when GnuTLS uses these it has trouble
connecting using the Mandos default priority string. This was
previously fixed in Mandos 1.6.2, but the bug reappeared when using
GnuTLS 3, so the default priority string has to change again; this
time also the Mandos client has to change its default, so now the
server and the client should use the same default priority string:
SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256
* mandos (main/server_defaults): Changed default priority string.
* mandos-options.xml (/section/para[id="priority_compat"]): Removed.
(/section/para[id="priority"]): Changed default priority string.
* mandos.conf ([DEFAULT]/priority): - '' -
* mandos.conf.xml (OPTIONS/priority): Refer to the id "priority"
instead of "priority_compat".
* mandos.xml (OPTIONS/--priority): - '' -
* plugins.d/mandos-client.c (main): Changed default priority string.
- files added:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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() */
43
stdout, ferror() */
44
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(), strcpy() */
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() */
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
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
177
185
perror(print_text);
178
186
}
179
187
180
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
189
int fprintf_plus(FILE *stream, const char *format, ...){
182
190
va_list ap;
183
191
va_start (ap, format);
184
192
185
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
194
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
196
}
189
197
190
198
/*
192
200
* bytes. "buffer_capacity" is how much is currently allocated,
193
201
* "buffer_length" is how much is already used.
194
202
*/
203
__attribute__((nonnull, warn_unused_result))
195
204
size_t incbuffer(char **buffer, size_t buffer_length,
196
205
size_t buffer_capacity){
197
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
200
213
return 0;
201
214
}
215
*buffer = new_buf;
202
216
buffer_capacity += BUFFER_SIZE;
203
217
}
204
218
return buffer_capacity;
205
219
}
206
220
207
221
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
210
225
int ret;
211
226
server *new_server = malloc(sizeof(server));
212
227
if(new_server == NULL){
219
234
.af = af };
220
235
if(new_server->ip == NULL){
221
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
222
252
return false;
223
253
}
224
254
/* Special case of first server */
225
if (mc.current_server == NULL){
255
if(*current_server == NULL){
226
256
new_server->next = new_server;
227
257
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
258
*current_server = new_server;
230
259
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
263
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
264
(*current_server)->prev = new_server;
240
265
}
241
266
return true;
242
267
}
244
269
/*
245
270
* Initialize GPGME.
246
271
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
249
277
gpgme_error_t rc;
250
278
gpgme_engine_info_t engine_info;
251
279
252
253
280
/*
254
281
* Helper function to insert pub and seckey to the engine keyring.
255
282
*/
256
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
257
284
int ret;
258
285
int fd;
259
286
gpgme_data_t pgp_data;
271
298
return false;
272
299
}
273
300
274
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
275
302
if(rc != GPG_ERR_NO_ERROR){
276
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
304
gpgme_strsource(rc), gpgme_strerror(rc));
278
305
return false;
279
306
}
280
307
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
282
309
if(ret == -1){
283
310
perror_plus("close");
284
311
}
321
348
}
322
349
323
350
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
325
352
if(rc != GPG_ERR_NO_ERROR){
326
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
346
375
gpgme_data_t dh_crypto, dh_plain;
347
376
gpgme_error_t rc;
348
377
ssize_t ret;
374
403
375
404
/* Decrypt data from the cryptotext data buffer to the plaintext
376
405
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
407
if(rc != GPG_ERR_NO_ERROR){
379
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
409
gpgme_strsource(rc), gpgme_strerror(rc));
381
410
plaintext_length = -1;
382
411
if(debug){
383
412
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
385
414
if(result == NULL){
386
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
416
} else {
464
493
return plaintext_length;
465
494
}
466
495
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
473
507
}
474
508
475
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
476
511
static void debuggnutls(__attribute__((unused)) int level,
477
512
const char* string){
478
513
fprintf_plus(stderr, "GnuTLS: %s", string);
479
514
}
480
515
516
__attribute__((nonnull, warn_unused_result))
481
517
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
483
521
int ret;
522
unsigned int uret;
484
523
485
524
if(debug){
486
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
502
541
}
503
542
504
543
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
545
if(ret != GNUTLS_E_SUCCESS){
507
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
547
safer_gnutls_strerror(ret));
518
557
}
519
558
520
559
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
522
561
GNUTLS_OPENPGP_FMT_BASE64);
523
562
if(ret != GNUTLS_E_SUCCESS){
524
563
fprintf_plus(stderr,
530
569
}
531
570
532
571
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
534
573
if(ret != GNUTLS_E_SUCCESS){
535
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
575
" initialization: %s\n",
537
576
safer_gnutls_strerror(ret));
538
577
goto globalfail;
539
578
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
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);
548
752
549
753
return 0;
550
754
551
755
globalfail:
552
756
553
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
554
758
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
556
760
return -1;
557
761
}
558
762
559
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
560
766
int ret;
561
767
/* GnuTLS session creation */
562
768
do {
574
780
{
575
781
const char *err;
576
782
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
784
if(quit_now){
579
785
gnutls_deinit(*session);
580
786
return -1;
591
797
592
798
do {
593
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
800
mc->cred);
595
801
if(quit_now){
596
802
gnutls_deinit(*session);
597
803
return -1;
607
813
/* ignore client certificate if any. */
608
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
815
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
816
return 0;
613
817
}
614
818
616
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
821
__attribute__((unused)) const char *txt){}
618
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
619
1041
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
621
1044
AvahiIfIndex if_index,
622
int af){
1045
int af, mandos_context *mc){
623
1046
int ret, tcp_sd = -1;
624
1047
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1048
struct sockaddr_storage to;
629
1049
char *buffer = NULL;
630
1050
char *decrypted_buffer = NULL;
631
1051
size_t buffer_length = 0;
634
1054
int retval = -1;
635
1055
gnutls_session_t session;
636
1056
int pf; /* Protocol family */
1057
bool route_added = false;
637
1058
638
1059
errno = 0;
639
1060
655
1076
return -1;
656
1077
}
657
1078
658
ret = init_gnutls_session(&session);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, 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);
659
1112
if(ret != 0){
660
1113
return -1;
661
1114
}
662
1115
663
1116
if(debug){
664
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1118
PRIuMAX "\n", ip, (uintmax_t)port);
666
1119
}
667
1120
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1122
if(tcp_sd < 0){
670
1123
int e = errno;
671
1124
perror_plus("socket");
678
1131
goto mandos_end;
679
1132
}
680
1133
681
memset(&to, 0, sizeof(to));
682
1134
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
685
1138
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
688
1142
}
689
1143
if(ret < 0 ){
690
1144
int e = errno;
699
1153
goto mandos_end;
700
1154
}
701
1155
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1159
if(if_index == AVAHI_IF_UNSPEC){
710
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1161
" incomplete without a network interface\n");
713
1163
goto mandos_end;
714
1164
}
715
1165
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1167
}
718
1168
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1170
}
723
1171
724
1172
if(quit_now){
732
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1181
perror_plus("if_indextoname");
734
1182
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
737
1185
}
738
1186
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
741
1189
}
742
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
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
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
http://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;
783
1272
}
784
1273
785
1274
const char *out = mandos_protocol_version;
936
1425
if(buffer_length > 0){
937
1426
ssize_t decrypted_buffer_size;
938
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
1428
&decrypted_buffer, mc);
940
1429
if(decrypted_buffer_size >= 0){
941
1430
942
1431
written = 0;
968
1457
969
1458
mandos_end:
970
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
971
1466
int e = errno;
972
1467
free(decrypted_buffer);
973
1468
free(buffer);
974
1469
if(tcp_sd >= 0){
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
976
1471
}
977
1472
if(ret == -1){
978
1473
if(e == 0){
990
1485
return retval;
991
1486
}
992
1487
1488
__attribute__((nonnull))
993
1489
static void resolve_callback(AvahiSServiceResolver *r,
994
1490
AvahiIfIndex interface,
995
1491
AvahiProtocol proto,
1003
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1501
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
1008
1506
1009
1507
/* Called whenever a service has been resolved successfully or
1010
1508
timed out */
1011
1509
1012
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1013
1512
return;
1014
1513
}
1015
1514
1019
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1520
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1023
1523
break;
1024
1524
1025
1525
case AVAHI_RESOLVER_FOUND:
1031
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1532
host_name, ip, (intmax_t)interface, port);
1033
1533
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1036
1538
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1038
1540
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1041
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1545
" list\n", name);
1043
1546
}
1056
1559
const char *domain,
1057
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1561
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1061
1566
1062
1567
/* Called whenever a new services becomes available on the LAN or
1063
1568
is removed from the LAN */
1071
1576
case AVAHI_BROWSER_FAILURE:
1072
1577
1073
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1076
1582
return;
1077
1583
1078
1584
case AVAHI_BROWSER_NEW:
1081
1587
the callback function is called the Avahi server will free the
1082
1588
resolver for us. */
1083
1589
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1087
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1595
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1090
1598
break;
1091
1599
1092
1600
case AVAHI_BROWSER_REMOVE:
1111
1619
signal_received = sig;
1112
1620
int old_errno = errno;
1113
1621
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1116
1624
}
1117
1625
errno = old_errno;
1118
1626
}
1119
1627
1628
__attribute__((nonnull, warn_unused_result))
1120
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1630
int ret;
1631
error_t ret_errno;
1122
1632
1123
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1634
if(s < 0){
1635
ret_errno = errno;
1125
1636
perror_plus("socket");
1637
errno = ret_errno;
1126
1638
return false;
1127
1639
}
1128
1640
strcpy(ifr->ifr_name, ifname);
1129
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1642
if(ret == -1){
1131
1643
if(debug){
1644
ret_errno = errno;
1132
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1133
1647
}
1134
1648
return false;
1135
1649
}
1136
1650
return true;
1137
1651
}
1138
1652
1653
__attribute__((nonnull, warn_unused_result))
1139
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1655
1141
1656
/* Reject the loopback device */
1183
1698
* corresponds to an acceptable network device.
1184
1699
* (This function is passed to scandir(3) as a filter function.)
1185
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1186
1702
int good_interface(const struct dirent *if_entry){
1187
1703
if(if_entry->d_name[0] == '.'){
1188
1704
return 0;
1204
1720
}
1205
1721
1206
1722
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1723
* This function determines if a network interface is up.
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
bool interface_is_up(const char *interface){
1727
struct ifreq ifr;
1728
if(not get_flags(interface, &ifr)){
1729
if(debug){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
}
1733
return false;
1734
}
1735
1736
return (bool)(ifr.ifr_flags & IFF_UP);
1737
}
1738
1739
/*
1740
* This function determines if a network interface is running
1741
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
bool interface_is_running(const char *interface){
1744
struct ifreq ifr;
1745
if(not get_flags(interface, &ifr)){
1746
if(debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
}
1750
return false;
1751
}
1752
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
}
1755
1756
__attribute__((nonnull, pure, warn_unused_result))
1249
1757
int notdotentries(const struct dirent *direntry){
1250
1758
/* Skip "." and ".." */
1251
1759
if(direntry->d_name[0] == '.'
1258
1766
}
1259
1767
1260
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1261
1770
int runnable_hook(const struct dirent *direntry){
1262
1771
int ret;
1263
1772
size_t sret;
1271
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1781
"abcdefghijklmnopqrstuvwxyz"
1273
1782
"0123456789"
1274
"_-");
1783
"_.-");
1275
1784
if((direntry->d_name)[sret] != '\0'){
1276
1785
/* Contains non-allowed characters */
1277
1786
if(debug){
1281
1790
return 0;
1282
1791
}
1283
1792
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);
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1794
if(ret == -1){
1293
1795
if(debug){
1294
1796
perror_plus("Could not stat hook");
1318
1820
return 1;
1319
1821
}
1320
1822
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1322
1826
int ret;
1323
1827
struct timespec now;
1324
1828
struct timespec waited_time;
1325
1829
intmax_t block_time;
1326
1830
1327
1831
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1832
if(mc->current_server == NULL){
1833
if(debug){
1330
1834
fprintf_plus(stderr, "Wait until first server is found."
1331
1835
" No timeout!\n");
1332
1836
}
1333
1837
ret = avahi_simple_poll_iterate(s, -1);
1334
1838
} else {
1335
if (debug){
1839
if(debug){
1336
1840
fprintf_plus(stderr, "Check current_server if we should run"
1337
1841
" it, or wait\n");
1338
1842
}
1345
1849
/* Calculating in ms how long time between now and server
1346
1850
who we visted longest time ago. Now - last seen. */
1347
1851
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1852
- mc->current_server->last_seen.tv_sec);
1349
1853
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1854
- mc->current_server->last_seen.tv_nsec);
1351
1855
/* total time is 10s/10,000ms.
1352
1856
Converting to s from ms by dividing by 1,000,
1353
1857
and ns to ms by dividing by 1,000,000. */
1355
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1861
1358
if (debug){
1862
if(debug){
1359
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1864
block_time);
1361
1865
}
1362
1866
1363
1867
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
1368
1872
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1873
avahi_simple_poll_quit(s);
1370
1874
return 0;
1371
1875
}
1372
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1877
&mc->current_server->last_seen);
1374
1878
if(ret == -1){
1375
1879
perror_plus("clock_gettime");
1376
1880
return -1;
1377
1881
}
1378
mc.current_server = mc.current_server->next;
1882
mc->current_server = mc->current_server->next;
1379
1883
block_time = 0; /* Call avahi to find new Mandos
1380
1884
servers, but don't block */
1381
1885
}
1383
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1888
}
1385
1889
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1890
if(ret > 0 or errno != EINTR){
1387
1891
return (ret != 1) ? ret : 0;
1388
1892
}
1389
1893
}
1390
1894
}
1391
1895
}
1392
1896
1393
bool run_network_hooks(const char *mode, const char *interface,
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1394
1899
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1400
1928
if(numhooks == -1){
1401
1929
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1409
1991
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1478
1996
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
1527
2287
}
1528
2288
1529
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1530
2295
AvahiSServiceBrowser *sb = NULL;
1531
int error;
2296
error_t ret_errno;
1532
2297
int ret;
1533
2298
intmax_t tmpmax;
1534
2299
char *tmp;
1535
2300
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1544
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
2307
const char *seckey = PATHDIR "/" SECKEY;
1546
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
1547
2311
1548
2312
bool gnutls_initialized = false;
1549
2313
bool gpgme_initialized = false;
1601
2365
.doc = "Bit length of the prime number used in the"
1602
2366
" Diffie-Hellman key exchange",
1603
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
1604
2373
{ .name = "priority", .key = 130,
1605
2374
.arg = "STRING",
1606
2375
.doc = "GnuTLS priority string for the TLS handshake",
1640
2409
connect_to = arg;
1641
2410
break;
1642
2411
case 'i': /* --interface */
1643
interface = arg;
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1644
2417
break;
1645
2418
case 's': /* --seckey */
1646
2419
seckey = arg;
1657
2430
}
1658
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1660
2436
case 130: /* --priority */
1661
2437
mc.priority = arg;
1662
2438
break;
1718
2494
goto end;
1719
2495
}
1720
2496
}
1721
2497
1722
2498
{
1723
2499
/* Work around Debian bug #633582:
1724
2500
<http://bugs.debian.org/633582> */
1725
2501
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
1731
2507
} else {
1732
2508
struct stat st;
1733
2509
1748
2524
}
1749
2525
}
1750
2526
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
2527
close(seckey_fd);
1752
2528
}
1753
2529
}
1754
2530
1755
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
2532
int pubkey_fd = open(pubkey, O_RDONLY);
1757
2533
if(pubkey_fd == -1){
1769
2545
}
1770
2546
}
1771
2547
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
1776
2574
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
1781
2596
}
1782
2597
}
1783
2598
}
1784
2599
1785
2600
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1788
2613
}
1789
2614
1790
2615
if(not debug){
1791
2616
avahi_set_log_function(empty_log);
1792
2617
}
1793
2618
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2620
from the signal handler */
1828
2621
/* Initialize the pseudo-RNG for Avahi */
1829
2622
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
1832
2625
fprintf_plus(stderr,
1833
2626
"Avahi: Failed to create simple poll object.\n");
1834
2627
exitcode = EX_UNAVAILABLE;
1898
2691
}
1899
2692
}
1900
2693
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
1986
2745
}
1987
2746
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2747
break;
2006
2748
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2777
}
2037
2778
2038
2779
if(quit_now){
2039
2780
goto end;
2040
2781
}
2041
2782
2042
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2043
2784
if(ret == -1){
2044
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2786
exitcode = EX_UNAVAILABLE;
2052
2793
goto end;
2053
2794
}
2054
2795
2055
if(mkdtemp(tempdir) == NULL){
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2056
2806
perror_plus("mkdtemp");
2057
2807
goto end;
2058
2808
}
2059
tempdir_created = true;
2060
2809
2061
2810
if(quit_now){
2062
2811
goto end;
2063
2812
}
2064
2813
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2816
exitcode = EX_UNAVAILABLE;
2068
2817
goto end;
2078
2827
/* Connect directly, do not use Zeroconf */
2079
2828
/* (Mainly meant for debugging) */
2080
2829
char *address = strrchr(connect_to, ':');
2830
2081
2831
if(address == NULL){
2082
2832
fprintf_plus(stderr, "No colon in address\n");
2083
2833
exitcode = EX_USAGE;
2088
2838
goto end;
2089
2839
}
2090
2840
2091
uint16_t port;
2841
in_port_t port;
2092
2842
errno = 0;
2093
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2845
or tmpmax != (in_port_t)tmpmax){
2096
2846
fprintf_plus(stderr, "Bad port number\n");
2097
2847
exitcode = EX_USAGE;
2098
2848
goto end;
2099
2849
}
2100
2850
2101
2851
if(quit_now){
2102
2852
goto end;
2103
2853
}
2104
2854
2105
port = (uint16_t)tmpmax;
2855
port = (in_port_t)tmpmax;
2106
2856
*address = '\0';
2107
2857
/* Colon in address indicates IPv6 */
2108
2858
int af;
2124
2874
}
2125
2875
2126
2876
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2128
2879
if(quit_now or ret == 0){
2129
2880
break;
2130
2881
}
2132
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2884
(int)retry_interval);
2134
2885
}
2135
sleep((int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2136
2887
}
2137
2888
2138
if (not quit_now){
2889
if(not quit_now){
2139
2890
exitcode = EXIT_SUCCESS;
2140
2891
}
2141
2892
2156
2907
config.publish_domain = 0;
2157
2908
2158
2909
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2162
2912
2163
2913
/* Free the Avahi configuration data */
2164
2914
avahi_server_config_free(&config);
2167
2917
/* Check if creating the Avahi server object succeeded */
2168
2918
if(mc.server == NULL){
2169
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2920
avahi_strerror(ret_errno));
2171
2921
exitcode = EX_UNAVAILABLE;
2172
2922
goto end;
2173
2923
}
2179
2929
/* Create the Avahi service browser */
2180
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2183
2934
if(sb == NULL){
2184
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2936
avahi_strerror(avahi_server_errno(mc.server)));
2196
2947
if(debug){
2197
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2949
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2202
2953
if(debug){
2203
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2955
(ret == 0) ? "successfully" : "with error");
2211
2962
}
2212
2963
2213
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
2214
2967
if(sb != NULL)
2215
2968
avahi_s_service_browser_free(sb);
2216
2969
2217
2970
if(mc.server != NULL)
2218
2971
avahi_server_free(mc.server);
2219
2972
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2222
2975
2223
2976
if(gnutls_initialized){
2224
2977
gnutls_certificate_free_credentials(mc.cred);
2236
2989
mc.current_server->prev->next = NULL;
2237
2990
while(mc.current_server != NULL){
2238
2991
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
2239
3000
free(mc.current_server);
2240
3001
mc.current_server = next;
2241
3002
}
2242
3003
}
2243
3004
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
3005
/* Re-raise privileges */
2248
3006
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
2253
3034
}
2254
3035
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
2271
3040
}
2272
3041
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
3042
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
2279
3045
2280
3046
/* Removes the GPGME temp directory and all files inside */
2281
if(tempdir_created){
3047
if(tempdir != NULL){
2282
3048
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
2302
3088
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
3089
close(tempdir_fd);
2313
3090
}
2314
3091
}
2315
3092
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0