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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- files removed:
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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 /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), 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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
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() */
98
90
99
91
#ifdef __linux__
100
92
#include <sys/klog.h> /* klogctl() */
142
134
static const char sys_class_net[] = "/sys/class/net";
143
135
char *connect_to = NULL;
144
136
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
137
149
138
/* Doubly linked list that need to be circularly linked when used */
150
139
typedef struct server{
151
140
const char *ip;
152
in_port_t port;
141
uint16_t port;
153
142
AvahiIfIndex if_index;
154
143
int af;
155
144
struct timespec last_seen;
159
148
160
149
/* Used for passing in values through the Avahi callback functions */
161
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
162
152
AvahiServer *server;
163
153
gnutls_certificate_credentials_t cred;
164
154
unsigned int dh_bits;
166
156
const char *priority;
167
157
gpgme_ctx_t ctx;
168
158
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
159
} mandos_context;
172
160
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
175
166
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
178
169
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
181
int e = errno;
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
184
errno = e;
185
174
perror(print_text);
186
175
}
187
176
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
177
int fprintf_plus(FILE *stream, const char *format, ...){
190
178
va_list ap;
191
179
va_start (ap, format);
192
180
193
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
182
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
184
}
197
185
198
186
/*
200
188
* bytes. "buffer_capacity" is how much is currently allocated,
201
189
* "buffer_length" is how much is already used.
202
190
*/
203
__attribute__((nonnull, warn_unused_result))
204
191
size_t incbuffer(char **buffer, size_t buffer_length,
205
192
size_t buffer_capacity){
206
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
213
196
return 0;
214
197
}
215
*buffer = new_buf;
216
198
buffer_capacity += BUFFER_SIZE;
217
199
}
218
200
return buffer_capacity;
219
201
}
220
202
221
203
/* Add server to set of servers to retry periodically */
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){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
225
206
int ret;
226
207
server *new_server = malloc(sizeof(server));
227
208
if(new_server == NULL){
228
209
perror_plus("malloc");
229
return false;
210
return -1;
230
211
}
231
212
*new_server = (server){ .ip = strdup(ip),
232
213
.port = port,
234
215
.af = af };
235
216
if(new_server->ip == NULL){
236
217
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);
252
return false;
218
return -1;
253
219
}
254
220
/* Special case of first server */
255
if(*current_server == NULL){
221
if (mc.current_server == NULL){
256
222
new_server->next = new_server;
257
223
new_server->prev = new_server;
258
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
259
226
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
263
229
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
267
238
}
268
239
269
240
/*
270
241
* Initialize GPGME.
271
242
*/
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){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
277
245
gpgme_error_t rc;
278
246
gpgme_engine_info_t engine_info;
279
247
248
280
249
/*
281
250
* Helper function to insert pub and seckey to the engine keyring.
282
251
*/
283
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
284
253
int ret;
285
254
int fd;
286
255
gpgme_data_t pgp_data;
298
267
return false;
299
268
}
300
269
301
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
302
271
if(rc != GPG_ERR_NO_ERROR){
303
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
273
gpgme_strsource(rc), gpgme_strerror(rc));
305
274
return false;
306
275
}
307
276
308
ret = close(fd);
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
278
if(ret == -1){
310
279
perror_plus("close");
311
280
}
348
317
}
349
318
350
319
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
352
321
if(rc != GPG_ERR_NO_ERROR){
353
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
336
* Decrypt OpenPGP data.
368
337
* Returns -1 on error
369
338
*/
370
__attribute__((nonnull, warn_unused_result))
371
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
340
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
341
char **plaintext){
375
342
gpgme_data_t dh_crypto, dh_plain;
376
343
gpgme_error_t rc;
377
344
ssize_t ret;
403
370
404
371
/* Decrypt data from the cryptotext data buffer to the plaintext
405
372
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
374
if(rc != GPG_ERR_NO_ERROR){
408
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
376
gpgme_strsource(rc), gpgme_strerror(rc));
410
377
plaintext_length = -1;
411
378
if(debug){
412
379
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
414
381
if(result == NULL){
415
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
383
} else {
493
460
return plaintext_length;
494
461
}
495
462
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);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
507
469
}
508
470
509
471
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
472
static void debuggnutls(__attribute__((unused)) int level,
512
473
const char* string){
513
474
fprintf_plus(stderr, "GnuTLS: %s", string);
514
475
}
515
476
516
__attribute__((nonnull, warn_unused_result))
517
477
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
478
const char *seckeyfilename){
521
479
int ret;
522
unsigned int uret;
523
480
524
481
if(debug){
525
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
541
498
}
542
499
543
500
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
502
if(ret != GNUTLS_E_SUCCESS){
546
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
504
safer_gnutls_strerror(ret));
557
514
}
558
515
559
516
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
561
518
GNUTLS_OPENPGP_FMT_BASE64);
562
519
if(ret != GNUTLS_E_SUCCESS){
563
520
fprintf_plus(stderr,
569
526
}
570
527
571
528
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
573
530
if(ret != GNUTLS_E_SUCCESS){
574
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
532
" initialization: %s\n",
576
533
safer_gnutls_strerror(ret));
577
534
goto globalfail;
578
535
}
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);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
544
753
545
return 0;
754
546
755
547
globalfail:
756
548
757
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
758
550
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
760
552
return -1;
761
553
}
762
554
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
766
556
int ret;
767
557
/* GnuTLS session creation */
768
558
do {
780
570
{
781
571
const char *err;
782
572
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
574
if(quit_now){
785
575
gnutls_deinit(*session);
786
576
return -1;
797
587
798
588
do {
799
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
590
mc.cred);
801
591
if(quit_now){
802
592
gnutls_deinit(*session);
803
593
return -1;
813
603
/* ignore client certificate if any. */
814
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
605
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
816
608
return 0;
817
609
}
818
610
820
612
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
613
__attribute__((unused)) const char *txt){}
822
614
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
1041
615
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
1044
617
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
618
int af){
1046
619
int ret, tcp_sd = -1;
1047
620
ssize_t sret;
1048
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1049
625
char *buffer = NULL;
1050
626
char *decrypted_buffer = NULL;
1051
627
size_t buffer_length = 0;
1054
630
int retval = -1;
1055
631
gnutls_session_t session;
1056
632
int pf; /* Protocol family */
1057
bool route_added = false;
1058
633
1059
634
errno = 0;
1060
635
1076
651
return -1;
1077
652
}
1078
653
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);
654
ret = init_gnutls_session(&session);
1112
655
if(ret != 0){
1113
656
return -1;
1114
657
}
1115
658
1116
659
if(debug){
1117
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
1119
662
}
1120
663
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
665
if(tcp_sd < 0){
1123
666
int e = errno;
1124
667
perror_plus("socket");
1131
674
goto mandos_end;
1132
675
}
1133
676
677
memset(&to, 0, sizeof(to));
1134
678
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
681
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
684
}
1143
685
if(ret < 0 ){
1144
686
int e = errno;
1153
695
goto mandos_end;
1154
696
}
1155
697
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
1159
705
if(if_index == AVAHI_IF_UNSPEC){
1160
706
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
707
" incomplete without a network interface\n");
1163
709
goto mandos_end;
1164
710
}
1165
711
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
713
}
1168
714
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1170
718
}
1171
719
1172
720
if(quit_now){
1180
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
729
perror_plus("if_indextoname");
1182
730
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1185
733
}
1186
734
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1189
737
}
1190
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
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;
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
1272
779
}
1273
780
1274
781
const char *out = mandos_protocol_version;
1310
817
goto mandos_end;
1311
818
}
1312
819
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1318
822
1319
823
if(quit_now){
1320
824
errno = EINTR;
1425
929
if(buffer_length > 0){
1426
930
ssize_t decrypted_buffer_size;
1427
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
932
&decrypted_buffer);
1429
933
if(decrypted_buffer_size >= 0){
1430
934
1431
935
written = 0;
1457
961
1458
962
mandos_end:
1459
963
{
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
}
1466
964
int e = errno;
1467
965
free(decrypted_buffer);
1468
966
free(buffer);
1469
967
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
969
}
1472
970
if(ret == -1){
1473
971
if(e == 0){
1485
983
return retval;
1486
984
}
1487
985
1488
__attribute__((nonnull))
1489
986
static void resolve_callback(AvahiSServiceResolver *r,
1490
987
AvahiIfIndex interface,
1491
988
AvahiProtocol proto,
1499
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
998
flags,
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1506
1001
1507
1002
/* Called whenever a service has been resolved successfully or
1508
1003
timed out */
1509
1004
1510
1005
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1006
return;
1513
1007
}
1514
1008
1518
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
1014
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1523
1016
break;
1524
1017
1525
1018
case AVAHI_RESOLVER_FOUND:
1531
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
1025
host_name, ip, (intmax_t)interface, port);
1533
1026
}
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1538
1029
if(ret == 0){
1539
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1540
1031
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1547
1034
}
1548
1035
}
1549
1036
}
1559
1046
const char *domain,
1560
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1048
flags,
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1566
1051
1567
1052
/* Called whenever a new services becomes available on the LAN or
1568
1053
is removed from the LAN */
1576
1061
case AVAHI_BROWSER_FAILURE:
1577
1062
1578
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1582
1066
return;
1583
1067
1584
1068
case AVAHI_BROWSER_NEW:
1587
1071
the callback function is called the Avahi server will free the
1588
1072
resolver for us. */
1589
1073
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)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1594
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
1078
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1598
1080
break;
1599
1081
1600
1082
case AVAHI_BROWSER_REMOVE:
1619
1101
signal_received = sig;
1620
1102
int old_errno = errno;
1621
1103
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1624
1106
}
1625
1107
errno = old_errno;
1626
1108
}
1627
1109
1628
__attribute__((nonnull, warn_unused_result))
1629
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1111
int ret;
1631
error_t ret_errno;
1632
1112
1633
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1114
if(s < 0){
1635
ret_errno = errno;
1636
1115
perror_plus("socket");
1637
errno = ret_errno;
1638
1116
return false;
1639
1117
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1118
strcpy(ifr->ifr_name, ifname);
1642
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1120
if(ret == -1){
1644
1121
if(debug){
1645
ret_errno = errno;
1646
1122
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1648
1123
}
1649
1124
return false;
1650
1125
}
1651
1126
return true;
1652
1127
}
1653
1128
1654
__attribute__((nonnull, warn_unused_result))
1655
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
1130
1657
1131
/* Reject the loopback device */
1699
1173
* corresponds to an acceptable network device.
1700
1174
* (This function is passed to scandir(3) as a filter function.)
1701
1175
*/
1702
__attribute__((nonnull, warn_unused_result))
1703
1176
int good_interface(const struct dirent *if_entry){
1704
1177
if(if_entry->d_name[0] == '.'){
1705
1178
return 0;
1721
1194
}
1722
1195
1723
1196
/*
1724
* This function determines if a network interface is up.
1725
*/
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1728
struct ifreq ifr;
1729
if(not get_flags(interface, &ifr)){
1730
if(debug){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1733
}
1734
return false;
1735
}
1736
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1738
}
1739
1740
/*
1741
* This function determines if a network interface is running
1742
*/
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1745
struct ifreq ifr;
1746
if(not get_flags(interface, &ifr)){
1747
if(debug){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1750
}
1751
return false;
1752
}
1753
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
}
1756
1757
__attribute__((nonnull, pure, warn_unused_result))
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1758
1239
int notdotentries(const struct dirent *direntry){
1759
1240
/* Skip "." and ".." */
1760
1241
if(direntry->d_name[0] == '.'
1767
1248
}
1768
1249
1769
1250
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
1251
int runnable_hook(const struct dirent *direntry){
1772
1252
int ret;
1773
1253
size_t sret;
1781
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
1262
"abcdefghijklmnopqrstuvwxyz"
1783
1263
"0123456789"
1784
"_.-");
1264
"_-");
1785
1265
if((direntry->d_name)[sret] != '\0'){
1786
1266
/* Contains non-allowed characters */
1787
1267
if(debug){
1791
1271
return 0;
1792
1272
}
1793
1273
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1795
1282
if(ret == -1){
1796
1283
if(debug){
1797
1284
perror_plus("Could not stat hook");
1814
1301
}
1815
1302
return 0;
1816
1303
}
1817
if(debug){
1818
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1819
direntry->d_name);
1820
}
1821
1304
return 1;
1822
1305
}
1823
1306
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1827
1308
int ret;
1828
1309
struct timespec now;
1829
1310
struct timespec waited_time;
1830
1311
intmax_t block_time;
1831
1312
1832
1313
while(true){
1833
if(mc->current_server == NULL){
1834
if(debug){
1314
if(mc.current_server == NULL){
1315
if (debug){
1835
1316
fprintf_plus(stderr, "Wait until first server is found."
1836
1317
" No timeout!\n");
1837
1318
}
1838
1319
ret = avahi_simple_poll_iterate(s, -1);
1839
1320
} else {
1840
if(debug){
1321
if (debug){
1841
1322
fprintf_plus(stderr, "Check current_server if we should run"
1842
1323
" it, or wait\n");
1843
1324
}
1850
1331
/* Calculating in ms how long time between now and server
1851
1332
who we visted longest time ago. Now - last seen. */
1852
1333
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1854
1335
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1856
1337
/* total time is 10s/10,000ms.
1857
1338
Converting to s from ms by dividing by 1,000,
1858
1339
and ns to ms by dividing by 1,000,000. */
1860
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1861
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
1343
1863
if(debug){
1344
if (debug){
1864
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
1346
block_time);
1866
1347
}
1867
1348
1868
1349
if(block_time <= 0){
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1873
1354
if(ret == 0){
1874
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1875
1356
return 0;
1876
1357
}
1877
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1879
1360
if(ret == -1){
1880
1361
perror_plus("clock_gettime");
1881
1362
return -1;
1882
1363
}
1883
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1884
1365
block_time = 0; /* Call avahi to find new Mandos
1885
1366
servers, but don't block */
1886
1367
}
1888
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
1370
}
1890
1371
if(ret != 0){
1891
if(ret > 0 or errno != EINTR){
1372
if (ret > 0 or errno != EINTR){
1892
1373
return (ret != 1) ? ret : 0;
1893
1374
}
1894
1375
}
1895
1376
}
1896
1377
}
1897
1378
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1379
bool run_network_hooks(const char *mode, const char *interface,
1900
1380
const float delay){
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1929
1386
if(numhooks == -1){
1930
1387
perror_plus("scandir");
1931
return;
1932
}
1933
struct dirent *direntry;
1934
int ret;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1945
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1992
1395
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1396
continue;
1994
1397
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1997
1436
free(delaystring);
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
2066
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
2086
}
2087
2088
__attribute__((nonnull, warn_unused_result))
2089
error_t bring_up_interface(const char *const interface,
2090
const float delay){
2091
error_t old_errno = errno;
2092
int ret;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2095
if(if_index == 0){
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2097
errno = old_errno;
2098
return ENXIO;
2099
}
2100
2101
if(quit_now){
2102
errno = old_errno;
2103
return EINTR;
2104
}
2105
2106
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i=0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
2288
1475
}
2289
1476
2290
1477
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2296
1478
AvahiSServiceBrowser *sb = NULL;
2297
error_t ret_errno;
1479
int error;
2298
1480
int ret;
2299
1481
intmax_t tmpmax;
2300
1482
char *tmp;
2301
1483
int exitcode = EXIT_SUCCESS;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
2307
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1493
const char *seckey = PATHDIR "/" SECKEY;
2309
1494
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2312
1495
2313
1496
bool gnutls_initialized = false;
2314
1497
bool gpgme_initialized = false;
2366
1549
.doc = "Bit length of the prime number used in the"
2367
1550
" Diffie-Hellman key exchange",
2368
1551
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
2374
1552
{ .name = "priority", .key = 130,
2375
1553
.arg = "STRING",
2376
1554
.doc = "GnuTLS priority string for the TLS handshake",
2381
1559
.group = 2 },
2382
1560
{ .name = "retry", .key = 132,
2383
1561
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
2385
1563
.group = 2 },
2386
1564
{ .name = "network-hook-dir", .key = 133,
2387
1565
.arg = "DIR",
2410
1588
connect_to = arg;
2411
1589
break;
2412
1590
case 'i': /* --interface */
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
1591
interface = arg;
2418
1592
break;
2419
1593
case 's': /* --seckey */
2420
1594
seckey = arg;
2431
1605
}
2432
1606
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1607
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1608
case 130: /* --priority */
2438
1609
mc.priority = arg;
2439
1610
break;
2466
1637
argp_state_help(state, state->out_stream,
2467
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2468
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
2469
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2470
1643
exit(argp_err_exit_status);
2471
1644
break;
2495
1668
goto end;
2496
1669
}
2497
1670
}
2498
1671
2499
1672
{
2500
1673
/* Work around Debian bug #633582:
2501
1674
<http://bugs.debian.org/633582> */
2502
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2509
struct stat st;
2510
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2515
} else {
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
if(ret == -1){
2518
perror_plus("fstat");
2519
} else {
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2523
if(ret == -1){
2524
perror_plus("fchown");
2525
}
2526
}
2527
}
2528
close(seckey_fd);
2529
}
2530
}
2531
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2536
} else {
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
if(ret == -1){
2539
perror_plus("fstat");
2540
} else {
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2544
if(ret == -1){
2545
perror_plus("fchown");
2546
}
2547
}
2548
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2575
/* Lower privileges */
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
2597
}
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2598
1731
}
2599
1732
}
2600
1733
2601
1734
/* Run network hooks */
2602
1735
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
2607
goto end;
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2614
1751
}
2615
1752
2616
1753
if(not debug){
2617
1754
avahi_set_log_function(empty_log);
2618
1755
}
2619
1756
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
2620
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
1790
from the signal handler */
2622
1791
/* Initialize the pseudo-RNG for Avahi */
2623
1792
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2626
1795
fprintf_plus(stderr,
2627
1796
"Avahi: Failed to create simple poll object.\n");
2628
1797
exitcode = EX_UNAVAILABLE;
2692
1861
}
2693
1862
}
2694
1863
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
2719
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2746
1949
}
2747
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2748
1968
break;
2749
1969
}
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2778
1999
}
2779
2000
2780
2001
if(quit_now){
2781
2002
goto end;
2782
2003
}
2783
2004
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2785
2006
if(ret == -1){
2786
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2008
exitcode = EX_UNAVAILABLE;
2794
2015
goto end;
2795
2016
}
2796
2017
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2018
if(mkdtemp(tempdir) == NULL){
2807
2019
perror_plus("mkdtemp");
2808
2020
goto end;
2809
2021
}
2022
tempdir_created = true;
2810
2023
2811
2024
if(quit_now){
2812
2025
goto end;
2813
2026
}
2814
2027
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2816
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2817
2030
exitcode = EX_UNAVAILABLE;
2818
2031
goto end;
2828
2041
/* Connect directly, do not use Zeroconf */
2829
2042
/* (Mainly meant for debugging) */
2830
2043
char *address = strrchr(connect_to, ':');
2831
2832
2044
if(address == NULL){
2833
2045
fprintf_plus(stderr, "No colon in address\n");
2834
2046
exitcode = EX_USAGE;
2839
2051
goto end;
2840
2052
}
2841
2053
2842
in_port_t port;
2054
uint16_t port;
2843
2055
errno = 0;
2844
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2845
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2846
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2847
2059
fprintf_plus(stderr, "Bad port number\n");
2848
2060
exitcode = EX_USAGE;
2849
2061
goto end;
2850
2062
}
2851
2063
2852
2064
if(quit_now){
2853
2065
goto end;
2854
2066
}
2855
2067
2856
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2857
2069
*address = '\0';
2858
2070
/* Colon in address indicates IPv6 */
2859
2071
int af;
2875
2087
}
2876
2088
2877
2089
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2880
2091
if(quit_now or ret == 0){
2881
2092
break;
2882
2093
}
2884
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
2096
(int)retry_interval);
2886
2097
}
2887
sleep((unsigned int)retry_interval);
2098
sleep((int)retry_interval);
2888
2099
}
2889
2100
2890
if(not quit_now){
2101
if (not quit_now){
2891
2102
exitcode = EXIT_SUCCESS;
2892
2103
}
2893
2104
2908
2119
config.publish_domain = 0;
2909
2120
2910
2121
/* Allocate a new server */
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2913
2125
2914
2126
/* Free the Avahi configuration data */
2915
2127
avahi_server_config_free(&config);
2918
2130
/* Check if creating the Avahi server object succeeded */
2919
2131
if(mc.server == NULL){
2920
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2922
2134
exitcode = EX_UNAVAILABLE;
2923
2135
goto end;
2924
2136
}
2930
2142
/* Create the Avahi service browser */
2931
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2932
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2935
2146
if(sb == NULL){
2936
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
2148
avahi_strerror(avahi_server_errno(mc.server)));
2948
2159
if(debug){
2949
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2161
}
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2954
2165
if(debug){
2955
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
2167
(ret == 0) ? "successfully" : "with error");
2963
2174
}
2964
2175
2965
2176
/* Cleanup things */
2966
free(mc.interfaces);
2967
2968
2177
if(sb != NULL)
2969
2178
avahi_s_service_browser_free(sb);
2970
2179
2971
2180
if(mc.server != NULL)
2972
2181
avahi_server_free(mc.server);
2973
2182
2974
if(simple_poll != NULL)
2975
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2976
2185
2977
2186
if(gnutls_initialized){
2978
2187
gnutls_certificate_free_credentials(mc.cred);
2983
2192
if(gpgme_initialized){
2984
2193
gpgme_release(mc.ctx);
2985
2194
}
2986
2195
2987
2196
/* Cleans up the circular linked list of Mandos servers the client
2988
2197
has seen */
2989
2198
if(mc.current_server != NULL){
2990
2199
mc.current_server->prev->next = NULL;
2991
2200
while(mc.current_server != NULL){
2992
2201
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
3001
2202
free(mc.current_server);
3002
2203
mc.current_server = next;
3003
2204
}
3004
2205
}
3005
2206
3006
/* Re-raise privileges */
2207
/* Re-raise priviliges */
3007
2208
{
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to raise privileges");
3012
} else {
3013
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3017
3018
/* Take down the network interfaces which were brought up */
3019
{
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3027
perror_plus("Failed to take down interface");
3028
}
3029
}
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3032
" down\n");
3033
}
3034
}
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
3035
2217
}
3036
2218
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
3041
2235
}
3042
2236
}
3043
3044
free(interfaces_to_take_down);
3045
free(interfaces_hooks);
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
3046
2243
3047
2244
/* Removes the GPGME temp directory and all files inside */
3048
if(tempdir != NULL){
2245
if(tempdir_created){
3049
2246
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
direntry->d_name);
2256
if(ret < 0){
2257
perror_plus("asprintf");
2258
continue;
2259
}
2260
ret = remove(fullname);
2261
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
2264
}
2265
free(fullname);
3089
2266
}
3090
close(tempdir_fd);
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
2273
}
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
3091
2277
}
3092
2278
}
3093
2279
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0