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- Committer: Teddy Hogeborn
- Date: 2015-12-06 04:09:43 UTC
- Revision ID: teddy@recompile.se-20151206040943-n08v1uym0d3h23u9
* mandos.xml (FILES): Removed duplicate entry for “/dev/log”.
- 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(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
170
178
171
179
/* Function to use when printing errors */
172
180
void perror_plus(const char *print_text){
181
int e = errno;
173
182
fprintf(stderr, "Mandos plugin %s: ",
174
183
program_invocation_short_name);
184
errno = e;
175
185
perror(print_text);
176
186
}
177
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
189
int fprintf_plus(FILE *stream, const char *format, ...){
179
190
va_list ap;
180
191
va_start (ap, format);
181
192
182
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
194
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
196
}
186
197
187
198
/*
189
200
* bytes. "buffer_capacity" is how much is currently allocated,
190
201
* "buffer_length" is how much is already used.
191
202
*/
203
__attribute__((nonnull, warn_unused_result))
192
204
size_t incbuffer(char **buffer, size_t buffer_length,
193
205
size_t buffer_capacity){
194
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
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;
197
213
return 0;
198
214
}
215
*buffer = new_buf;
199
216
buffer_capacity += BUFFER_SIZE;
200
217
}
201
218
return buffer_capacity;
202
219
}
203
220
204
221
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
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){
207
225
int ret;
208
226
server *new_server = malloc(sizeof(server));
209
227
if(new_server == NULL){
210
228
perror_plus("malloc");
211
return -1;
229
return false;
212
230
}
213
231
*new_server = (server){ .ip = strdup(ip),
214
232
.port = port,
216
234
.af = af };
217
235
if(new_server->ip == NULL){
218
236
perror_plus("strdup");
219
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;
220
253
}
221
254
/* Special case of first server */
222
if (mc.current_server == NULL){
255
if(*current_server == NULL){
223
256
new_server->next = new_server;
224
257
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
258
*current_server = new_server;
227
259
} else {
228
new_server->next = mc.current_server;
229
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;
230
263
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
239
267
}
240
268
241
269
/*
242
270
* Initialize GPGME.
243
271
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
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){
246
277
gpgme_error_t rc;
247
278
gpgme_engine_info_t engine_info;
248
279
249
250
280
/*
251
281
* Helper function to insert pub and seckey to the engine keyring.
252
282
*/
253
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
254
284
int ret;
255
285
int fd;
256
286
gpgme_data_t pgp_data;
268
298
return false;
269
299
}
270
300
271
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
272
302
if(rc != GPG_ERR_NO_ERROR){
273
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
304
gpgme_strsource(rc), gpgme_strerror(rc));
275
305
return false;
276
306
}
277
307
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
279
309
if(ret == -1){
280
310
perror_plus("close");
281
311
}
318
348
}
319
349
320
350
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
322
352
if(rc != GPG_ERR_NO_ERROR){
323
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
367
* Decrypt OpenPGP data.
338
368
* Returns -1 on error
339
369
*/
370
__attribute__((nonnull, warn_unused_result))
340
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
372
size_t crypto_size,
342
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
343
375
gpgme_data_t dh_crypto, dh_plain;
344
376
gpgme_error_t rc;
345
377
ssize_t ret;
371
403
372
404
/* Decrypt data from the cryptotext data buffer to the plaintext
373
405
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
407
if(rc != GPG_ERR_NO_ERROR){
376
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
409
gpgme_strsource(rc), gpgme_strerror(rc));
378
410
plaintext_length = -1;
379
411
if(debug){
380
412
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
382
414
if(result == NULL){
383
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
416
} else {
461
493
return plaintext_length;
462
494
}
463
495
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
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);
470
507
}
471
508
472
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
473
511
static void debuggnutls(__attribute__((unused)) int level,
474
512
const char* string){
475
513
fprintf_plus(stderr, "GnuTLS: %s", string);
476
514
}
477
515
516
__attribute__((nonnull, warn_unused_result))
478
517
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
480
521
int ret;
522
unsigned int uret;
481
523
482
524
if(debug){
483
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
499
541
}
500
542
501
543
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
545
if(ret != GNUTLS_E_SUCCESS){
504
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
547
safer_gnutls_strerror(ret));
515
557
}
516
558
517
559
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
519
561
GNUTLS_OPENPGP_FMT_BASE64);
520
562
if(ret != GNUTLS_E_SUCCESS){
521
563
fprintf_plus(stderr,
527
569
}
528
570
529
571
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
531
573
if(ret != GNUTLS_E_SUCCESS){
532
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
575
" initialization: %s\n",
534
576
safer_gnutls_strerror(ret));
535
577
goto globalfail;
536
578
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
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);
545
752
546
753
return 0;
547
754
548
755
globalfail:
549
756
550
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
551
758
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
553
760
return -1;
554
761
}
555
762
556
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){
557
766
int ret;
558
767
/* GnuTLS session creation */
559
768
do {
571
780
{
572
781
const char *err;
573
782
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
784
if(quit_now){
576
785
gnutls_deinit(*session);
577
786
return -1;
588
797
589
798
do {
590
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
800
mc->cred);
592
801
if(quit_now){
593
802
gnutls_deinit(*session);
594
803
return -1;
604
813
/* ignore client certificate if any. */
605
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
815
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
609
816
return 0;
610
817
}
611
818
613
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
821
__attribute__((unused)) const char *txt){}
615
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
616
1041
/* Called when a Mandos server is found */
617
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,
618
1044
AvahiIfIndex if_index,
619
int af){
1045
int af, mandos_context *mc){
620
1046
int ret, tcp_sd = -1;
621
1047
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
1048
struct sockaddr_storage to;
626
1049
char *buffer = NULL;
627
1050
char *decrypted_buffer = NULL;
628
1051
size_t buffer_length = 0;
631
1054
int retval = -1;
632
1055
gnutls_session_t session;
633
1056
int pf; /* Protocol family */
1057
bool route_added = false;
634
1058
635
1059
errno = 0;
636
1060
652
1076
return -1;
653
1077
}
654
1078
655
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);
656
1112
if(ret != 0){
657
1113
return -1;
658
1114
}
659
1115
660
1116
if(debug){
661
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
1118
PRIuMAX "\n", ip, (uintmax_t)port);
663
1119
}
664
1120
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
666
1122
if(tcp_sd < 0){
667
1123
int e = errno;
668
1124
perror_plus("socket");
675
1131
goto mandos_end;
676
1132
}
677
1133
678
memset(&to, 0, sizeof(to));
679
1134
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
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);
682
1138
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
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);
685
1142
}
686
1143
if(ret < 0 ){
687
1144
int e = errno;
696
1153
goto mandos_end;
697
1154
}
698
1155
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
1159
if(if_index == AVAHI_IF_UNSPEC){
707
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
708
1161
" incomplete without a network interface\n");
710
1163
goto mandos_end;
711
1164
}
712
1165
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
1167
}
715
1168
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
1170
}
720
1171
721
1172
if(quit_now){
729
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
1181
perror_plus("if_indextoname");
731
1182
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
734
1185
}
735
1186
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
738
1189
}
739
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
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) 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;
780
1272
}
781
1273
782
1274
const char *out = mandos_protocol_version;
818
1310
goto mandos_end;
819
1311
}
820
1312
821
/* Spurious warning from -Wint-to-pointer-cast */
822
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);
823
1318
824
1319
if(quit_now){
825
1320
errno = EINTR;
930
1425
if(buffer_length > 0){
931
1426
ssize_t decrypted_buffer_size;
932
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
1428
&decrypted_buffer, mc);
934
1429
if(decrypted_buffer_size >= 0){
935
1430
936
1431
written = 0;
962
1457
963
1458
mandos_end:
964
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
}
965
1466
int e = errno;
966
1467
free(decrypted_buffer);
967
1468
free(buffer);
968
1469
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
970
1471
}
971
1472
if(ret == -1){
972
1473
if(e == 0){
984
1485
return retval;
985
1486
}
986
1487
1488
__attribute__((nonnull))
987
1489
static void resolve_callback(AvahiSServiceResolver *r,
988
1490
AvahiIfIndex interface,
989
1491
AvahiProtocol proto,
997
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1501
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
1002
1506
1003
1507
/* Called whenever a service has been resolved successfully or
1004
1508
timed out */
1005
1509
1006
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1007
1512
return;
1008
1513
}
1009
1514
1013
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1520
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1017
1523
break;
1018
1524
1019
1525
case AVAHI_RESOLVER_FOUND:
1025
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1532
host_name, ip, (intmax_t)interface, port);
1027
1533
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
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);
1030
1538
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1032
1540
} else {
1033
ret = add_server(ip, port, interface,
1034
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
}
1035
1547
}
1036
1548
}
1037
1549
}
1047
1559
const char *domain,
1048
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1561
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1052
1566
1053
1567
/* Called whenever a new services becomes available on the LAN or
1054
1568
is removed from the LAN */
1062
1576
case AVAHI_BROWSER_FAILURE:
1063
1577
1064
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
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);
1067
1582
return;
1068
1583
1069
1584
case AVAHI_BROWSER_NEW:
1072
1587
the callback function is called the Avahi server will free the
1073
1588
resolver for us. */
1074
1589
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
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)
1078
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1595
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1081
1598
break;
1082
1599
1083
1600
case AVAHI_BROWSER_REMOVE:
1102
1619
signal_received = sig;
1103
1620
int old_errno = errno;
1104
1621
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1107
1624
}
1108
1625
errno = old_errno;
1109
1626
}
1110
1627
1628
__attribute__((nonnull, warn_unused_result))
1111
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1630
int ret;
1631
error_t ret_errno;
1113
1632
1114
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1634
if(s < 0){
1635
ret_errno = errno;
1116
1636
perror_plus("socket");
1637
errno = ret_errno;
1117
1638
return false;
1118
1639
}
1119
1640
strcpy(ifr->ifr_name, ifname);
1120
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1642
if(ret == -1){
1122
1643
if(debug){
1644
ret_errno = errno;
1123
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1124
1647
}
1125
1648
return false;
1126
1649
}
1127
1650
return true;
1128
1651
}
1129
1652
1653
__attribute__((nonnull, warn_unused_result))
1130
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1655
1132
1656
/* Reject the loopback device */
1174
1698
* corresponds to an acceptable network device.
1175
1699
* (This function is passed to scandir(3) as a filter function.)
1176
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1177
1702
int good_interface(const struct dirent *if_entry){
1178
1703
if(if_entry->d_name[0] == '.'){
1179
1704
return 0;
1195
1720
}
1196
1721
1197
1722
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
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))
1240
1757
int notdotentries(const struct dirent *direntry){
1241
1758
/* Skip "." and ".." */
1242
1759
if(direntry->d_name[0] == '.'
1249
1766
}
1250
1767
1251
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1252
1770
int runnable_hook(const struct dirent *direntry){
1253
1771
int ret;
1254
1772
size_t sret;
1262
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
1781
"abcdefghijklmnopqrstuvwxyz"
1264
1782
"0123456789"
1265
"_-");
1783
"_.-");
1266
1784
if((direntry->d_name)[sret] != '\0'){
1267
1785
/* Contains non-allowed characters */
1268
1786
if(debug){
1272
1790
return 0;
1273
1791
}
1274
1792
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1283
1794
if(ret == -1){
1284
1795
if(debug){
1285
1796
perror_plus("Could not stat hook");
1309
1820
return 1;
1310
1821
}
1311
1822
1312
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){
1313
1826
int ret;
1314
1827
struct timespec now;
1315
1828
struct timespec waited_time;
1316
1829
intmax_t block_time;
1317
1830
1318
1831
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1832
if(mc->current_server == NULL){
1833
if(debug){
1321
1834
fprintf_plus(stderr, "Wait until first server is found."
1322
1835
" No timeout!\n");
1323
1836
}
1324
1837
ret = avahi_simple_poll_iterate(s, -1);
1325
1838
} else {
1326
if (debug){
1839
if(debug){
1327
1840
fprintf_plus(stderr, "Check current_server if we should run"
1328
1841
" it, or wait\n");
1329
1842
}
1336
1849
/* Calculating in ms how long time between now and server
1337
1850
who we visted longest time ago. Now - last seen. */
1338
1851
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1852
- mc->current_server->last_seen.tv_sec);
1340
1853
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1854
- mc->current_server->last_seen.tv_nsec);
1342
1855
/* total time is 10s/10,000ms.
1343
1856
Converting to s from ms by dividing by 1,000,
1344
1857
and ns to ms by dividing by 1,000,000. */
1346
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1861
1349
if (debug){
1862
if(debug){
1350
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
1864
block_time);
1352
1865
}
1353
1866
1354
1867
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
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);
1359
1872
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1873
avahi_simple_poll_quit(s);
1361
1874
return 0;
1362
1875
}
1363
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1877
&mc->current_server->last_seen);
1365
1878
if(ret == -1){
1366
1879
perror_plus("clock_gettime");
1367
1880
return -1;
1368
1881
}
1369
mc.current_server = mc.current_server->next;
1882
mc->current_server = mc->current_server->next;
1370
1883
block_time = 0; /* Call avahi to find new Mandos
1371
1884
servers, but don't block */
1372
1885
}
1374
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1888
}
1376
1889
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1890
if(ret > 0 or errno != EINTR){
1378
1891
return (ret != 1) ? ret : 0;
1379
1892
}
1380
1893
}
1381
1894
}
1382
1895
}
1383
1896
1384
bool run_network_hooks(const char *mode, const char *interface,
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1385
1899
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
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__ */
1391
1928
if(numhooks == -1){
1392
1929
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
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){
1400
1991
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1471
1996
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
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;
1511
2287
}
1512
2288
1513
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1514
2295
AvahiSServiceBrowser *sb = NULL;
1515
int error;
2296
error_t ret_errno;
1516
2297
int ret;
1517
2298
intmax_t tmpmax;
1518
2299
char *tmp;
1519
2300
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1528
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
2307
const char *seckey = PATHDIR "/" SECKEY;
1530
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
1531
2311
1532
2312
bool gnutls_initialized = false;
1533
2313
bool gpgme_initialized = false;
1585
2365
.doc = "Bit length of the prime number used in the"
1586
2366
" Diffie-Hellman key exchange",
1587
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
1588
2373
{ .name = "priority", .key = 130,
1589
2374
.arg = "STRING",
1590
2375
.doc = "GnuTLS priority string for the TLS handshake",
1595
2380
.group = 2 },
1596
2381
{ .name = "retry", .key = 132,
1597
2382
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
2383
.doc = "Retry interval used when denied by the Mandos server",
1599
2384
.group = 2 },
1600
2385
{ .name = "network-hook-dir", .key = 133,
1601
2386
.arg = "DIR",
1624
2409
connect_to = arg;
1625
2410
break;
1626
2411
case 'i': /* --interface */
1627
interface = arg;
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1628
2417
break;
1629
2418
case 's': /* --seckey */
1630
2419
seckey = arg;
1641
2430
}
1642
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1643
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1644
2436
case 130: /* --priority */
1645
2437
mc.priority = arg;
1646
2438
break;
1673
2465
argp_state_help(state, state->out_stream,
1674
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
2467
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
2469
exit(argp_err_exit_status);
1680
2470
break;
1704
2494
goto end;
1705
2495
}
1706
2496
}
1707
2497
1708
2498
{
1709
2499
/* Work around Debian bug #633582:
1710
2500
<http://bugs.debian.org/633582> */
1711
2501
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
1717
2507
} else {
1718
2508
struct stat st;
1719
2509
1734
2524
}
1735
2525
}
1736
2526
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
2527
close(seckey_fd);
1738
2528
}
1739
2529
}
1740
2530
1741
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
2532
int pubkey_fd = open(pubkey, O_RDONLY);
1743
2533
if(pubkey_fd == -1){
1755
2545
}
1756
2546
}
1757
2547
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
1762
2574
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
1767
2596
}
1768
2597
}
1769
2598
}
1770
2599
1771
2600
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1774
2613
}
1775
2614
1776
2615
if(not debug){
1777
2616
avahi_set_log_function(empty_log);
1778
2617
}
1779
2618
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2620
from the signal handler */
1814
2621
/* Initialize the pseudo-RNG for Avahi */
1815
2622
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
1818
2625
fprintf_plus(stderr,
1819
2626
"Avahi: Failed to create simple poll object.\n");
1820
2627
exitcode = EX_UNAVAILABLE;
1884
2691
}
1885
2692
}
1886
2693
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
1972
2745
}
1973
2746
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
1991
2747
break;
1992
2748
}
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2022
2777
}
2023
2778
2024
2779
if(quit_now){
2025
2780
goto end;
2026
2781
}
2027
2782
2028
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2029
2784
if(ret == -1){
2030
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
2786
exitcode = EX_UNAVAILABLE;
2038
2793
goto end;
2039
2794
}
2040
2795
2041
if(mkdtemp(tempdir) == NULL){
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2042
2806
perror_plus("mkdtemp");
2043
2807
goto end;
2044
2808
}
2045
tempdir_created = true;
2046
2809
2047
2810
if(quit_now){
2048
2811
goto end;
2049
2812
}
2050
2813
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2052
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2053
2816
exitcode = EX_UNAVAILABLE;
2054
2817
goto end;
2064
2827
/* Connect directly, do not use Zeroconf */
2065
2828
/* (Mainly meant for debugging) */
2066
2829
char *address = strrchr(connect_to, ':');
2830
2067
2831
if(address == NULL){
2068
2832
fprintf_plus(stderr, "No colon in address\n");
2069
2833
exitcode = EX_USAGE;
2074
2838
goto end;
2075
2839
}
2076
2840
2077
uint16_t port;
2841
in_port_t port;
2078
2842
errno = 0;
2079
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2080
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2845
or tmpmax != (in_port_t)tmpmax){
2082
2846
fprintf_plus(stderr, "Bad port number\n");
2083
2847
exitcode = EX_USAGE;
2084
2848
goto end;
2085
2849
}
2086
2850
2087
2851
if(quit_now){
2088
2852
goto end;
2089
2853
}
2090
2854
2091
port = (uint16_t)tmpmax;
2855
port = (in_port_t)tmpmax;
2092
2856
*address = '\0';
2093
2857
/* Colon in address indicates IPv6 */
2094
2858
int af;
2110
2874
}
2111
2875
2112
2876
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2114
2879
if(quit_now or ret == 0){
2115
2880
break;
2116
2881
}
2118
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
2884
(int)retry_interval);
2120
2885
}
2121
sleep((int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2122
2887
}
2123
2888
2124
if (not quit_now){
2889
if(not quit_now){
2125
2890
exitcode = EXIT_SUCCESS;
2126
2891
}
2127
2892
2142
2907
config.publish_domain = 0;
2143
2908
2144
2909
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2148
2912
2149
2913
/* Free the Avahi configuration data */
2150
2914
avahi_server_config_free(&config);
2153
2917
/* Check if creating the Avahi server object succeeded */
2154
2918
if(mc.server == NULL){
2155
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2920
avahi_strerror(ret_errno));
2157
2921
exitcode = EX_UNAVAILABLE;
2158
2922
goto end;
2159
2923
}
2165
2929
/* Create the Avahi service browser */
2166
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2169
2934
if(sb == NULL){
2170
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
2936
avahi_strerror(avahi_server_errno(mc.server)));
2182
2947
if(debug){
2183
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
2949
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2188
2953
if(debug){
2189
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
2955
(ret == 0) ? "successfully" : "with error");
2197
2962
}
2198
2963
2199
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
2200
2967
if(sb != NULL)
2201
2968
avahi_s_service_browser_free(sb);
2202
2969
2203
2970
if(mc.server != NULL)
2204
2971
avahi_server_free(mc.server);
2205
2972
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2208
2975
2209
2976
if(gnutls_initialized){
2210
2977
gnutls_certificate_free_credentials(mc.cred);
2222
2989
mc.current_server->prev->next = NULL;
2223
2990
while(mc.current_server != NULL){
2224
2991
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
2225
3000
free(mc.current_server);
2226
3001
mc.current_server = next;
2227
3002
}
2228
3003
}
2229
3004
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
3005
/* Re-raise privileges */
2234
3006
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
2239
3034
}
2240
3035
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
2257
3040
}
2258
3041
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
3042
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
2265
3045
2266
3046
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
3047
if(tempdir != NULL){
2268
3048
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
direntry->d_name);
2278
if(ret < 0){
2279
perror_plus("asprintf");
2280
continue;
2281
}
2282
ret = remove(fullname);
2283
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
2286
}
2287
free(fullname);
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
2288
3088
}
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
2295
}
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
3089
close(tempdir_fd);
2299
3090
}
2300
3091
}
2301
3092
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0