To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 775
- compare with another revision
- download diff
- download tarball
- view history from revision 775
- Committer: Teddy Hogeborn
- Date: 2015-07-20 00:18:59 UTC
- Revision ID: teddy@recompile.se-20150720001859-4373dkxokj7bt666
plugin-runner: Minor fix: close helperdir before exiting in fork.
* plugin-runner.c: Minor fix: close helperdir before exiting in fork
if helper program could not be opened.
* plugin-runner.c: Minor fix: close helperdir before exiting in fork
if helper program could not be opened.
- files added:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2015 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() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), 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() */
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,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
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() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
189
int fprintf_plus(FILE *stream, const char *format, ...){
178
190
va_list ap;
179
191
va_start (ap, format);
180
192
181
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
194
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
196
}
185
197
186
198
/*
188
200
* bytes. "buffer_capacity" is how much is currently allocated,
189
201
* "buffer_length" is how much is already used.
190
202
*/
203
__attribute__((nonnull, warn_unused_result))
191
204
size_t incbuffer(char **buffer, size_t buffer_length,
192
205
size_t buffer_capacity){
193
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
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;
196
213
return 0;
197
214
}
215
*buffer = new_buf;
198
216
buffer_capacity += BUFFER_SIZE;
199
217
}
200
218
return buffer_capacity;
201
219
}
202
220
203
221
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
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){
206
225
int ret;
207
226
server *new_server = malloc(sizeof(server));
208
227
if(new_server == NULL){
209
228
perror_plus("malloc");
210
return -1;
229
return false;
211
230
}
212
231
*new_server = (server){ .ip = strdup(ip),
213
232
.port = port,
215
234
.af = af };
216
235
if(new_server->ip == NULL){
217
236
perror_plus("strdup");
218
return -1;
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;
219
253
}
220
254
/* Special case of first server */
221
if (mc.current_server == NULL){
255
if(*current_server == NULL){
222
256
new_server->next = new_server;
223
257
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
258
*current_server = new_server;
226
259
} else {
227
new_server->next = mc.current_server;
228
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;
229
263
new_server->prev->next = new_server;
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;
264
(*current_server)->prev = new_server;
265
}
266
return true;
238
267
}
239
268
240
269
/*
241
270
* Initialize GPGME.
242
271
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
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){
245
277
gpgme_error_t rc;
246
278
gpgme_engine_info_t engine_info;
247
279
248
249
280
/*
250
281
* Helper function to insert pub and seckey to the engine keyring.
251
282
*/
252
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
253
284
int ret;
254
285
int fd;
255
286
gpgme_data_t pgp_data;
267
298
return false;
268
299
}
269
300
270
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
271
302
if(rc != GPG_ERR_NO_ERROR){
272
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
304
gpgme_strsource(rc), gpgme_strerror(rc));
274
305
return false;
275
306
}
276
307
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
278
309
if(ret == -1){
279
310
perror_plus("close");
280
311
}
317
348
}
318
349
319
350
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
321
352
if(rc != GPG_ERR_NO_ERROR){
322
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
336
367
* Decrypt OpenPGP data.
337
368
* Returns -1 on error
338
369
*/
370
__attribute__((nonnull, warn_unused_result))
339
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
372
size_t crypto_size,
341
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
342
375
gpgme_data_t dh_crypto, dh_plain;
343
376
gpgme_error_t rc;
344
377
ssize_t ret;
370
403
371
404
/* Decrypt data from the cryptotext data buffer to the plaintext
372
405
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
407
if(rc != GPG_ERR_NO_ERROR){
375
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
409
gpgme_strsource(rc), gpgme_strerror(rc));
377
410
plaintext_length = -1;
378
411
if(debug){
379
412
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
381
414
if(result == NULL){
382
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
416
} else {
460
493
return plaintext_length;
461
494
}
462
495
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;
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);
469
507
}
470
508
471
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
472
511
static void debuggnutls(__attribute__((unused)) int level,
473
512
const char* string){
474
513
fprintf_plus(stderr, "GnuTLS: %s", string);
475
514
}
476
515
516
__attribute__((nonnull, warn_unused_result))
477
517
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
479
521
int ret;
522
unsigned int uret;
480
523
481
524
if(debug){
482
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
498
541
}
499
542
500
543
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
545
if(ret != GNUTLS_E_SUCCESS){
503
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
547
safer_gnutls_strerror(ret));
514
557
}
515
558
516
559
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
518
561
GNUTLS_OPENPGP_FMT_BASE64);
519
562
if(ret != GNUTLS_E_SUCCESS){
520
563
fprintf_plus(stderr,
526
569
}
527
570
528
571
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
530
573
if(ret != GNUTLS_E_SUCCESS){
531
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
575
" initialization: %s\n",
533
576
safer_gnutls_strerror(ret));
534
577
goto globalfail;
535
578
}
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);
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);
544
752
545
753
return 0;
546
754
547
755
globalfail:
548
756
549
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
550
758
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
552
760
return -1;
553
761
}
554
762
555
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){
556
766
int ret;
557
767
/* GnuTLS session creation */
558
768
do {
570
780
{
571
781
const char *err;
572
782
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
784
if(quit_now){
575
785
gnutls_deinit(*session);
576
786
return -1;
587
797
588
798
do {
589
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
800
mc->cred);
591
801
if(quit_now){
592
802
gnutls_deinit(*session);
593
803
return -1;
603
813
/* ignore client certificate if any. */
604
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
815
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
608
816
return 0;
609
817
}
610
818
612
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
613
821
__attribute__((unused)) const char *txt){}
614
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
615
1041
/* Called when a Mandos server is found */
616
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,
617
1044
AvahiIfIndex if_index,
618
int af){
1045
int af, mandos_context *mc){
619
1046
int ret, tcp_sd = -1;
620
1047
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1048
struct sockaddr_storage to;
625
1049
char *buffer = NULL;
626
1050
char *decrypted_buffer = NULL;
627
1051
size_t buffer_length = 0;
630
1054
int retval = -1;
631
1055
gnutls_session_t session;
632
1056
int pf; /* Protocol family */
1057
bool route_added = false;
633
1058
634
1059
errno = 0;
635
1060
651
1076
return -1;
652
1077
}
653
1078
654
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);
655
1112
if(ret != 0){
656
1113
return -1;
657
1114
}
658
1115
659
1116
if(debug){
660
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
1118
PRIuMAX "\n", ip, (uintmax_t)port);
662
1119
}
663
1120
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
1122
if(tcp_sd < 0){
666
1123
int e = errno;
667
1124
perror_plus("socket");
674
1131
goto mandos_end;
675
1132
}
676
1133
677
memset(&to, 0, sizeof(to));
678
1134
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
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);
681
1138
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
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);
684
1142
}
685
1143
if(ret < 0 ){
686
1144
int e = errno;
695
1153
goto mandos_end;
696
1154
}
697
1155
if(af == AF_INET6){
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*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
1159
if(if_index == AVAHI_IF_UNSPEC){
706
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
707
1161
" incomplete without a network interface\n");
709
1163
goto mandos_end;
710
1164
}
711
1165
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
1167
}
714
1168
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
1170
}
719
1171
720
1172
if(quit_now){
728
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
1181
perror_plus("if_indextoname");
730
1182
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
733
1185
}
734
1186
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
737
1189
}
738
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
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;
779
1272
}
780
1273
781
1274
const char *out = mandos_protocol_version;
817
1310
goto mandos_end;
818
1311
}
819
1312
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
822
1318
823
1319
if(quit_now){
824
1320
errno = EINTR;
929
1425
if(buffer_length > 0){
930
1426
ssize_t decrypted_buffer_size;
931
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
1428
&decrypted_buffer, mc);
933
1429
if(decrypted_buffer_size >= 0){
934
1430
935
1431
written = 0;
961
1457
962
1458
mandos_end:
963
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
}
964
1466
int e = errno;
965
1467
free(decrypted_buffer);
966
1468
free(buffer);
967
1469
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
969
1471
}
970
1472
if(ret == -1){
971
1473
if(e == 0){
983
1485
return retval;
984
1486
}
985
1487
1488
__attribute__((nonnull))
986
1489
static void resolve_callback(AvahiSServiceResolver *r,
987
1490
AvahiIfIndex interface,
988
1491
AvahiProtocol proto,
996
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1501
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
1001
1506
1002
1507
/* Called whenever a service has been resolved successfully or
1003
1508
timed out */
1004
1509
1005
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1006
1512
return;
1007
1513
}
1008
1514
1012
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1520
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1016
1523
break;
1017
1524
1018
1525
case AVAHI_RESOLVER_FOUND:
1024
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1532
host_name, ip, (intmax_t)interface, port);
1026
1533
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
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);
1029
1538
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1031
1540
} else {
1032
ret = add_server(ip, port, interface,
1033
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)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
1034
1547
}
1035
1548
}
1036
1549
}
1046
1559
const char *domain,
1047
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1561
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1051
1566
1052
1567
/* Called whenever a new services becomes available on the LAN or
1053
1568
is removed from the LAN */
1061
1576
case AVAHI_BROWSER_FAILURE:
1062
1577
1063
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
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);
1066
1582
return;
1067
1583
1068
1584
case AVAHI_BROWSER_NEW:
1071
1587
the callback function is called the Avahi server will free the
1072
1588
resolver for us. */
1073
1589
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
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)
1077
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1595
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1080
1598
break;
1081
1599
1082
1600
case AVAHI_BROWSER_REMOVE:
1101
1619
signal_received = sig;
1102
1620
int old_errno = errno;
1103
1621
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1106
1624
}
1107
1625
errno = old_errno;
1108
1626
}
1109
1627
1628
__attribute__((nonnull, warn_unused_result))
1110
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1630
int ret;
1631
error_t ret_errno;
1112
1632
1113
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1634
if(s < 0){
1635
ret_errno = errno;
1115
1636
perror_plus("socket");
1637
errno = ret_errno;
1116
1638
return false;
1117
1639
}
1118
1640
strcpy(ifr->ifr_name, ifname);
1119
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1642
if(ret == -1){
1121
1643
if(debug){
1644
ret_errno = errno;
1122
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1123
1647
}
1124
1648
return false;
1125
1649
}
1126
1650
return true;
1127
1651
}
1128
1652
1653
__attribute__((nonnull, warn_unused_result))
1129
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1655
1131
1656
/* Reject the loopback device */
1173
1698
* corresponds to an acceptable network device.
1174
1699
* (This function is passed to scandir(3) as a filter function.)
1175
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1176
1702
int good_interface(const struct dirent *if_entry){
1177
1703
if(if_entry->d_name[0] == '.'){
1178
1704
return 0;
1194
1720
}
1195
1721
1196
1722
/*
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
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))
1239
1757
int notdotentries(const struct dirent *direntry){
1240
1758
/* Skip "." and ".." */
1241
1759
if(direntry->d_name[0] == '.'
1248
1766
}
1249
1767
1250
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1251
1770
int runnable_hook(const struct dirent *direntry){
1252
1771
int ret;
1253
1772
size_t sret;
1261
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
1781
"abcdefghijklmnopqrstuvwxyz"
1263
1782
"0123456789"
1264
"_-");
1783
"_.-");
1265
1784
if((direntry->d_name)[sret] != '\0'){
1266
1785
/* Contains non-allowed characters */
1267
1786
if(debug){
1271
1790
return 0;
1272
1791
}
1273
1792
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);
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1282
1794
if(ret == -1){
1283
1795
if(debug){
1284
1796
perror_plus("Could not stat hook");
1301
1813
}
1302
1814
return 0;
1303
1815
}
1816
if(debug){
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1818
direntry->d_name);
1819
}
1304
1820
return 1;
1305
1821
}
1306
1822
1307
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){
1308
1826
int ret;
1309
1827
struct timespec now;
1310
1828
struct timespec waited_time;
1311
1829
intmax_t block_time;
1312
1830
1313
1831
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1832
if(mc->current_server == NULL){
1833
if(debug){
1316
1834
fprintf_plus(stderr, "Wait until first server is found."
1317
1835
" No timeout!\n");
1318
1836
}
1319
1837
ret = avahi_simple_poll_iterate(s, -1);
1320
1838
} else {
1321
if (debug){
1839
if(debug){
1322
1840
fprintf_plus(stderr, "Check current_server if we should run"
1323
1841
" it, or wait\n");
1324
1842
}
1331
1849
/* Calculating in ms how long time between now and server
1332
1850
who we visted longest time ago. Now - last seen. */
1333
1851
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1852
- mc->current_server->last_seen.tv_sec);
1335
1853
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1854
- mc->current_server->last_seen.tv_nsec);
1337
1855
/* total time is 10s/10,000ms.
1338
1856
Converting to s from ms by dividing by 1,000,
1339
1857
and ns to ms by dividing by 1,000,000. */
1341
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1861
1344
if (debug){
1862
if(debug){
1345
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1864
block_time);
1347
1865
}
1348
1866
1349
1867
if(block_time <= 0){
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);
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);
1354
1872
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1873
avahi_simple_poll_quit(s);
1356
1874
return 0;
1357
1875
}
1358
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1877
&mc->current_server->last_seen);
1360
1878
if(ret == -1){
1361
1879
perror_plus("clock_gettime");
1362
1880
return -1;
1363
1881
}
1364
mc.current_server = mc.current_server->next;
1882
mc->current_server = mc->current_server->next;
1365
1883
block_time = 0; /* Call avahi to find new Mandos
1366
1884
servers, but don't block */
1367
1885
}
1369
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1888
}
1371
1889
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1890
if(ret > 0 or errno != EINTR){
1373
1891
return (ret != 1) ? ret : 0;
1374
1892
}
1375
1893
}
1376
1894
}
1377
1895
}
1378
1896
1379
bool run_network_hooks(const char *mode, const char *interface,
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1380
1899
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
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__ */
1386
1928
if(numhooks == -1){
1387
1929
perror_plus("scandir");
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){
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){
1395
1991
perror_plus("asprintf");
1396
continue;
1992
_exit(EX_OSERR);
1397
1993
}
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
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1436
1996
free(delaystring);
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;
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;
1475
2287
}
1476
2288
1477
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", .current_server = NULL,
2293
.interfaces = NULL, .interfaces_size = 0 };
1478
2294
AvahiSServiceBrowser *sb = NULL;
1479
int error;
2295
error_t ret_errno;
1480
2296
int ret;
1481
2297
intmax_t tmpmax;
1482
2298
char *tmp;
1483
2299
int exitcode = EXIT_SUCCESS;
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;
2300
char *interfaces_to_take_down = NULL;
2301
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
1492
2305
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
2306
const char *seckey = PATHDIR "/" SECKEY;
1494
2307
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
1495
2310
1496
2311
bool gnutls_initialized = false;
1497
2312
bool gpgme_initialized = false;
1549
2364
.doc = "Bit length of the prime number used in the"
1550
2365
" Diffie-Hellman key exchange",
1551
2366
.group = 2 },
2367
{ .name = "dh-params", .key = 134,
2368
.arg = "FILE",
2369
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2370
" for the Diffie-Hellman key exchange",
2371
.group = 2 },
1552
2372
{ .name = "priority", .key = 130,
1553
2373
.arg = "STRING",
1554
2374
.doc = "GnuTLS priority string for the TLS handshake",
1559
2379
.group = 2 },
1560
2380
{ .name = "retry", .key = 132,
1561
2381
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
2382
.doc = "Retry interval used when denied by the Mandos server",
1563
2383
.group = 2 },
1564
2384
{ .name = "network-hook-dir", .key = 133,
1565
2385
.arg = "DIR",
1588
2408
connect_to = arg;
1589
2409
break;
1590
2410
case 'i': /* --interface */
1591
interface = arg;
2411
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2412
arg, (int)',');
2413
if(ret_errno != 0){
2414
argp_error(state, "%s", strerror(ret_errno));
2415
}
1592
2416
break;
1593
2417
case 's': /* --seckey */
1594
2418
seckey = arg;
1605
2429
}
1606
2430
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1607
2431
break;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2434
break;
1608
2435
case 130: /* --priority */
1609
2436
mc.priority = arg;
1610
2437
break;
1637
2464
argp_state_help(state, state->out_stream,
1638
2465
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
2466
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
2467
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
2468
exit(argp_err_exit_status);
1644
2469
break;
1668
2493
goto end;
1669
2494
}
1670
2495
}
1671
2496
1672
2497
{
1673
2498
/* Work around Debian bug #633582:
1674
2499
<http://bugs.debian.org/633582> */
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");
2500
2501
/* Re-raise privileges */
2502
ret_errno = raise_privileges();
2503
if(ret_errno != 0){
2504
errno = ret_errno;
2505
perror_plus("Failed to raise privileges");
2506
} else {
2507
struct stat st;
2508
2509
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
int seckey_fd = open(seckey, O_RDONLY);
2511
if(seckey_fd == -1){
2512
perror_plus("open");
2513
} else {
2514
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2515
if(ret == -1){
2516
perror_plus("fstat");
2517
} else {
2518
if(S_ISREG(st.st_mode)
2519
and st.st_uid == 0 and st.st_gid == 0){
2520
ret = fchown(seckey_fd, uid, gid);
2521
if(ret == -1){
2522
perror_plus("fchown");
2523
}
2524
}
2525
}
2526
close(seckey_fd);
2527
}
2528
}
2529
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2531
int pubkey_fd = open(pubkey, O_RDONLY);
2532
if(pubkey_fd == -1){
2533
perror_plus("open");
2534
} else {
2535
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2536
if(ret == -1){
2537
perror_plus("fstat");
2538
} else {
2539
if(S_ISREG(st.st_mode)
2540
and st.st_uid == 0 and st.st_gid == 0){
2541
ret = fchown(pubkey_fd, uid, gid);
2542
if(ret == -1){
2543
perror_plus("fchown");
2544
}
2545
}
2546
}
2547
close(pubkey_fd);
2548
}
2549
}
2550
2551
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2552
int dhparams_fd = open(dh_params_file, O_RDONLY);
2553
if(dhparams_fd == -1){
2554
perror_plus("open");
2555
} else {
2556
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2557
if(ret == -1){
2558
perror_plus("fstat");
2559
} else {
2560
if(S_ISREG(st.st_mode)
2561
and st.st_uid == 0 and st.st_gid == 0){
2562
ret = fchown(dhparams_fd, uid, gid);
2563
if(ret == -1){
2564
perror_plus("fchown");
2565
}
2566
}
2567
}
2568
close(dhparams_fd);
2569
}
2570
}
2571
2572
/* Lower privileges */
2573
ret_errno = lower_privileges();
2574
if(ret_errno != 0){
2575
errno = ret_errno;
2576
perror_plus("Failed to lower privileges");
2577
}
2578
}
2579
}
2580
2581
/* Remove invalid interface names (except "none") */
2582
{
2583
char *interface = NULL;
2584
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2585
interface))){
2586
if(strcmp(interface, "none") != 0
2587
and if_nametoindex(interface) == 0){
2588
if(interface[0] != '\0'){
2589
fprintf_plus(stderr, "Not using nonexisting interface"
2590
" \"%s\"\n", interface);
2591
}
2592
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2593
interface = NULL;
2594
}
1731
2595
}
1732
2596
}
1733
2597
1734
2598
/* Run network hooks */
1735
2599
{
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
}
2600
if(mc.interfaces != NULL){
2601
interfaces_hooks = malloc(mc.interfaces_size);
2602
if(interfaces_hooks == NULL){
2603
perror_plus("malloc");
2604
goto end;
2605
}
2606
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2607
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2608
}
2609
run_network_hooks("start", interfaces_hooks != NULL ?
2610
interfaces_hooks : "", delay);
1751
2611
}
1752
2612
1753
2613
if(not debug){
1754
2614
avahi_set_log_function(empty_log);
1755
2615
}
1756
2616
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
1789
2617
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2618
from the signal handler */
1791
2619
/* Initialize the pseudo-RNG for Avahi */
1792
2620
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2621
simple_poll = avahi_simple_poll_new();
2622
if(simple_poll == NULL){
1795
2623
fprintf_plus(stderr,
1796
2624
"Avahi: Failed to create simple poll object.\n");
1797
2625
exitcode = EX_UNAVAILABLE;
1861
2689
}
1862
2690
}
1863
2691
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");
2692
/* If no interfaces were specified, make a list */
2693
if(mc.interfaces == NULL){
2694
struct dirent **direntries = NULL;
2695
/* Look for any good interfaces */
2696
ret = scandir(sys_class_net, &direntries, good_interface,
2697
alphasort);
2698
if(ret >= 1){
2699
/* Add all found interfaces to interfaces list */
2700
for(int i = 0; i < ret; ++i){
2701
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2702
direntries[i]->d_name);
2703
if(ret_errno != 0){
2704
errno = ret_errno;
2705
perror_plus("argz_add");
2706
free(direntries[i]);
2707
continue;
2708
}
2709
if(debug){
2710
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2711
direntries[i]->d_name);
2712
}
2713
free(direntries[i]);
2714
}
2715
free(direntries);
2716
} else {
2717
if(ret == 0){
2718
free(direntries);
2719
}
2720
fprintf_plus(stderr, "Could not find a network interface\n");
2721
exitcode = EXIT_FAILURE;
2722
goto end;
2723
}
2724
}
2725
2726
/* Bring up interfaces which are down, and remove any "none"s */
2727
{
2728
char *interface = NULL;
2729
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2730
interface))){
2731
/* If interface name is "none", stop bringing up interfaces.
2732
Also remove all instances of "none" from the list */
2733
if(strcmp(interface, "none") == 0){
2734
argz_delete(&mc.interfaces, &mc.interfaces_size,
2735
interface);
2736
interface = NULL;
2737
while((interface = argz_next(mc.interfaces,
2738
mc.interfaces_size, interface))){
2739
if(strcmp(interface, "none") == 0){
2740
argz_delete(&mc.interfaces, &mc.interfaces_size,
2741
interface);
2742
interface = NULL;
1949
2743
}
1950
2744
}
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){
1968
2745
break;
1969
2746
}
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
}
2747
bool interface_was_up = interface_is_up(interface);
2748
errno = bring_up_interface(interface, delay);
2749
if(not interface_was_up){
2750
if(errno != 0){
2751
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2752
" %s\n", interface, strerror(errno));
2753
} else {
2754
errno = argz_add(&interfaces_to_take_down,
2755
&interfaces_to_take_down_size,
2756
interface);
2757
if(errno != 0){
2758
perror_plus("argz_add");
2759
}
2760
}
2761
}
2762
}
2763
if(debug and (interfaces_to_take_down == NULL)){
2764
fprintf_plus(stderr, "No interfaces were brought up\n");
2765
}
2766
}
2767
2768
/* If we only got one interface, explicitly use only that one */
2769
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2770
if(debug){
2771
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2772
mc.interfaces);
2773
}
2774
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1999
2775
}
2000
2776
2001
2777
if(quit_now){
2002
2778
goto end;
2003
2779
}
2004
2780
2005
ret = init_gnutls_global(pubkey, seckey);
2781
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2006
2782
if(ret == -1){
2007
2783
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
2784
exitcode = EX_UNAVAILABLE;
2015
2791
goto end;
2016
2792
}
2017
2793
2018
if(mkdtemp(tempdir) == NULL){
2794
/* Try /run/tmp before /tmp */
2795
tempdir = mkdtemp(run_tempdir);
2796
if(tempdir == NULL and errno == ENOENT){
2797
if(debug){
2798
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2799
run_tempdir, old_tempdir);
2800
}
2801
tempdir = mkdtemp(old_tempdir);
2802
}
2803
if(tempdir == NULL){
2019
2804
perror_plus("mkdtemp");
2020
2805
goto end;
2021
2806
}
2022
tempdir_created = true;
2023
2807
2024
2808
if(quit_now){
2025
2809
goto end;
2026
2810
}
2027
2811
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2812
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2029
2813
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2814
exitcode = EX_UNAVAILABLE;
2031
2815
goto end;
2041
2825
/* Connect directly, do not use Zeroconf */
2042
2826
/* (Mainly meant for debugging) */
2043
2827
char *address = strrchr(connect_to, ':');
2828
2044
2829
if(address == NULL){
2045
2830
fprintf_plus(stderr, "No colon in address\n");
2046
2831
exitcode = EX_USAGE;
2051
2836
goto end;
2052
2837
}
2053
2838
2054
uint16_t port;
2839
in_port_t port;
2055
2840
errno = 0;
2056
2841
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2842
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2843
or tmpmax != (in_port_t)tmpmax){
2059
2844
fprintf_plus(stderr, "Bad port number\n");
2060
2845
exitcode = EX_USAGE;
2061
2846
goto end;
2062
2847
}
2063
2848
2064
2849
if(quit_now){
2065
2850
goto end;
2066
2851
}
2067
2852
2068
port = (uint16_t)tmpmax;
2853
port = (in_port_t)tmpmax;
2069
2854
*address = '\0';
2070
2855
/* Colon in address indicates IPv6 */
2071
2856
int af;
2087
2872
}
2088
2873
2089
2874
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2875
ret = start_mandos_communication(address, port, if_index, af,
2876
&mc);
2091
2877
if(quit_now or ret == 0){
2092
2878
break;
2093
2879
}
2095
2881
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
2882
(int)retry_interval);
2097
2883
}
2098
sleep((int)retry_interval);
2884
sleep((unsigned int)retry_interval);
2099
2885
}
2100
2886
2101
if (not quit_now){
2887
if(not quit_now){
2102
2888
exitcode = EXIT_SUCCESS;
2103
2889
}
2104
2890
2119
2905
config.publish_domain = 0;
2120
2906
2121
2907
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2908
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2909
&config, NULL, NULL, &ret_errno);
2125
2910
2126
2911
/* Free the Avahi configuration data */
2127
2912
avahi_server_config_free(&config);
2130
2915
/* Check if creating the Avahi server object succeeded */
2131
2916
if(mc.server == NULL){
2132
2917
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2918
avahi_strerror(ret_errno));
2134
2919
exitcode = EX_UNAVAILABLE;
2135
2920
goto end;
2136
2921
}
2142
2927
/* Create the Avahi service browser */
2143
2928
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
2929
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2930
NULL, 0, browse_callback,
2931
(void *)&mc);
2146
2932
if(sb == NULL){
2147
2933
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
2934
avahi_strerror(avahi_server_errno(mc.server)));
2159
2945
if(debug){
2160
2946
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
2947
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2948
2949
ret = avahi_loop_with_timeout(simple_poll,
2950
(int)(retry_interval * 1000), &mc);
2165
2951
if(debug){
2166
2952
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
2953
(ret == 0) ? "successfully" : "with error");
2174
2960
}
2175
2961
2176
2962
/* Cleanup things */
2963
free(mc.interfaces);
2964
2177
2965
if(sb != NULL)
2178
2966
avahi_s_service_browser_free(sb);
2179
2967
2180
2968
if(mc.server != NULL)
2181
2969
avahi_server_free(mc.server);
2182
2970
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2971
if(simple_poll != NULL)
2972
avahi_simple_poll_free(simple_poll);
2185
2973
2186
2974
if(gnutls_initialized){
2187
2975
gnutls_certificate_free_credentials(mc.cred);
2192
2980
if(gpgme_initialized){
2193
2981
gpgme_release(mc.ctx);
2194
2982
}
2195
2983
2196
2984
/* Cleans up the circular linked list of Mandos servers the client
2197
2985
has seen */
2198
2986
if(mc.current_server != NULL){
2199
2987
mc.current_server->prev->next = NULL;
2200
2988
while(mc.current_server != NULL){
2201
2989
server *next = mc.current_server->next;
2990
#ifdef __GNUC__
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2993
#endif
2994
free((char *)(mc.current_server->ip));
2995
#ifdef __GNUC__
2996
#pragma GCC diagnostic pop
2997
#endif
2202
2998
free(mc.current_server);
2203
2999
mc.current_server = next;
2204
3000
}
2205
3001
}
2206
3002
2207
/* Re-raise priviliges */
3003
/* Re-raise privileges */
2208
3004
{
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;
3005
ret_errno = raise_privileges();
3006
if(ret_errno != 0){
3007
errno = ret_errno;
3008
perror_plus("Failed to raise privileges");
3009
} else {
3010
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3014
3015
/* Take down the network interfaces which were brought up */
3016
{
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3020
interface))){
3021
ret_errno = take_down_interface(interface);
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to take down interface");
3025
}
3026
}
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
3029
" down\n");
3030
}
3031
}
2217
3032
}
2218
3033
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
}
3034
ret_errno = lower_privileges_permanently();
3035
if(ret_errno != 0){
3036
errno = ret_errno;
3037
perror_plus("Failed to lower privileges permanently");
2235
3038
}
2236
3039
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
3040
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
2243
3043
2244
3044
/* Removes the GPGME temp directory and all files inside */
2245
if(tempdir_created){
3045
if(tempdir != NULL){
2246
3046
struct dirent **direntries = NULL;
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);
3047
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3048
| O_NOFOLLOW
3049
| O_DIRECTORY
3050
| O_PATH));
3051
if(tempdir_fd == -1){
3052
perror_plus("open");
3053
} else {
3054
#ifdef __GLIBC__
3055
#if __GLIBC_PREREQ(2, 15)
3056
int numentries = scandirat(tempdir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
#else /* not __GLIBC_PREREQ(2, 15) */
3059
int numentries = scandir(tempdir, &direntries, notdotentries,
3060
alphasort);
3061
#endif /* not __GLIBC_PREREQ(2, 15) */
3062
#else /* not __GLIBC__ */
3063
int numentries = scandir(tempdir, &direntries, notdotentries,
3064
alphasort);
3065
#endif /* not __GLIBC__ */
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3069
if(ret == -1){
3070
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3071
" \"%s\", 0): %s\n", tempdir,
3072
direntries[i]->d_name, strerror(errno));
3073
}
3074
free(direntries[i]);
3075
}
3076
3077
/* need to clean even if 0 because man page doesn't specify */
3078
free(direntries);
3079
if(numentries == -1){
3080
perror_plus("scandir");
3081
}
3082
ret = rmdir(tempdir);
3083
if(ret == -1 and errno != ENOENT){
3084
perror_plus("rmdir");
3085
}
2266
3086
}
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");
3087
close(tempdir_fd);
2277
3088
}
2278
3089
}
2279
3090
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0