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- Committer: Teddy Hogeborn
- Date: 2012-06-01 21:48:12 UTC
- Revision ID: teddy@recompile.se-20120601214812-g7685v5oeiuhi2qw
* debian/copyright (Copyright): Join the two lines to one line.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
- files removed:
- debian/upstream
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
185
177
perror(print_text);
186
178
}
187
179
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
189
181
int fprintf_plus(FILE *stream, const char *format, ...){
190
182
va_list ap;
191
183
va_start (ap, format);
192
184
193
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
186
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
188
}
197
189
198
190
/*
200
192
* bytes. "buffer_capacity" is how much is currently allocated,
201
193
* "buffer_length" is how much is already used.
202
194
*/
203
__attribute__((nonnull, warn_unused_result))
204
195
size_t incbuffer(char **buffer, size_t buffer_length,
205
196
size_t buffer_capacity){
206
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
213
200
return 0;
214
201
}
215
*buffer = new_buf;
216
202
buffer_capacity += BUFFER_SIZE;
217
203
}
218
204
return buffer_capacity;
219
205
}
220
206
221
207
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
225
210
int ret;
226
211
server *new_server = malloc(sizeof(server));
227
212
if(new_server == NULL){
234
219
.af = af };
235
220
if(new_server->ip == NULL){
236
221
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
222
return false;
253
223
}
254
224
/* Special case of first server */
255
if(*current_server == NULL){
225
if (mc.current_server == NULL){
256
226
new_server->next = new_server;
257
227
new_server->prev = new_server;
258
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
259
230
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
263
233
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
265
240
}
266
241
return true;
267
242
}
269
244
/*
270
245
* Initialize GPGME.
271
246
*/
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){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
277
249
gpgme_error_t rc;
278
250
gpgme_engine_info_t engine_info;
279
251
252
280
253
/*
281
254
* Helper function to insert pub and seckey to the engine keyring.
282
255
*/
283
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
284
257
int ret;
285
258
int fd;
286
259
gpgme_data_t pgp_data;
298
271
return false;
299
272
}
300
273
301
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
302
275
if(rc != GPG_ERR_NO_ERROR){
303
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
277
gpgme_strsource(rc), gpgme_strerror(rc));
348
321
}
349
322
350
323
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
352
325
if(rc != GPG_ERR_NO_ERROR){
353
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
340
* Decrypt OpenPGP data.
368
341
* Returns -1 on error
369
342
*/
370
__attribute__((nonnull, warn_unused_result))
371
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
344
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
345
char **plaintext){
375
346
gpgme_data_t dh_crypto, dh_plain;
376
347
gpgme_error_t rc;
377
348
ssize_t ret;
403
374
404
375
/* Decrypt data from the cryptotext data buffer to the plaintext
405
376
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
378
if(rc != GPG_ERR_NO_ERROR){
408
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
380
gpgme_strsource(rc), gpgme_strerror(rc));
410
381
plaintext_length = -1;
411
382
if(debug){
412
383
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
414
385
if(result == NULL){
415
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
387
} else {
493
464
return plaintext_length;
494
465
}
495
466
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
499
470
if(ret == NULL)
500
471
ret = "(unknown)";
501
472
return ret;
502
473
}
503
474
504
475
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
476
static void debuggnutls(__attribute__((unused)) int level,
507
477
const char* string){
508
478
fprintf_plus(stderr, "GnuTLS: %s", string);
509
479
}
510
480
511
__attribute__((nonnull, warn_unused_result))
512
481
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
482
const char *seckeyfilename){
515
483
int ret;
516
484
517
485
if(debug){
534
502
}
535
503
536
504
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
506
if(ret != GNUTLS_E_SUCCESS){
539
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
508
safer_gnutls_strerror(ret));
550
518
}
551
519
552
520
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
554
522
GNUTLS_OPENPGP_FMT_BASE64);
555
523
if(ret != GNUTLS_E_SUCCESS){
556
524
fprintf_plus(stderr,
562
530
}
563
531
564
532
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
566
534
if(ret != GNUTLS_E_SUCCESS){
567
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
536
" initialization: %s\n",
569
537
safer_gnutls_strerror(ret));
570
538
goto globalfail;
571
539
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
541
if(ret != GNUTLS_E_SUCCESS){
574
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
543
safer_gnutls_strerror(ret));
576
544
goto globalfail;
577
545
}
578
546
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
548
581
549
return 0;
582
550
583
551
globalfail:
584
552
585
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
586
554
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
588
556
return -1;
589
557
}
590
558
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
594
560
int ret;
595
561
/* GnuTLS session creation */
596
562
do {
608
574
{
609
575
const char *err;
610
576
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
578
if(quit_now){
613
579
gnutls_deinit(*session);
614
580
return -1;
625
591
626
592
do {
627
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
594
mc.cred);
629
595
if(quit_now){
630
596
gnutls_deinit(*session);
631
597
return -1;
641
607
/* ignore client certificate if any. */
642
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
609
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
611
646
612
return 0;
647
613
}
651
617
__attribute__((unused)) const char *txt){}
652
618
653
619
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
656
621
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
622
int af){
658
623
int ret, tcp_sd = -1;
659
624
ssize_t sret;
660
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
661
629
char *buffer = NULL;
662
630
char *decrypted_buffer = NULL;
663
631
size_t buffer_length = 0;
687
655
return -1;
688
656
}
689
657
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
723
659
if(ret != 0){
724
660
return -1;
725
661
}
726
662
727
663
if(debug){
728
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
730
666
}
731
667
732
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
680
745
681
memset(&to, 0, sizeof(to));
746
682
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
685
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
752
688
}
753
689
if(ret < 0 ){
754
690
int e = errno;
763
699
goto mandos_end;
764
700
}
765
701
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
769
709
if(if_index == AVAHI_IF_UNSPEC){
770
710
fprintf_plus(stderr, "An IPv6 link-local address is"
771
711
" incomplete without a network interface\n");
773
713
goto mandos_end;
774
714
}
775
715
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
777
717
}
778
718
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
780
722
}
781
723
782
724
if(quit_now){
790
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
733
perror_plus("if_indextoname");
792
734
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
795
737
}
796
738
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
799
741
}
800
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
802
745
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
807
748
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
812
751
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
819
758
}
820
759
}
821
760
825
764
}
826
765
827
766
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
768
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
770
}
834
771
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
773
int e = errno;
837
774
perror_plus("connect");
838
775
errno = e;
999
936
if(buffer_length > 0){
1000
937
ssize_t decrypted_buffer_size;
1001
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
939
&decrypted_buffer);
1003
940
if(decrypted_buffer_size >= 0){
1004
941
1005
942
written = 0;
1053
990
return retval;
1054
991
}
1055
992
1056
__attribute__((nonnull))
1057
993
static void resolve_callback(AvahiSServiceResolver *r,
1058
994
AvahiIfIndex interface,
1059
995
AvahiProtocol proto,
1067
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
1005
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1074
1008
1075
1009
/* Called whenever a service has been resolved successfully or
1076
1010
timed out */
1085
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1086
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1087
1021
domain,
1088
avahi_strerror(avahi_server_errno
1089
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1090
1023
break;
1091
1024
1092
1025
case AVAHI_RESOLVER_FOUND:
1098
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1099
1032
host_name, ip, (intmax_t)interface, port);
1100
1033
}
1101
int ret = start_mandos_communication(ip, (in_port_t)port,
1102
interface,
1103
avahi_proto_to_af(proto),
1104
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1105
1036
if(ret == 0){
1106
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1107
1038
} else {
1108
if(not add_server(ip, (in_port_t)port, interface,
1109
avahi_proto_to_af(proto),
1110
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1111
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1112
1042
" list\n", name);
1113
1043
}
1126
1056
const char *domain,
1127
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1128
1058
flags,
1129
void *mc){
1130
if(b == NULL){
1131
return;
1132
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1133
1061
1134
1062
/* Called whenever a new services becomes available on the LAN or
1135
1063
is removed from the LAN */
1143
1071
case AVAHI_BROWSER_FAILURE:
1144
1072
1145
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1146
avahi_strerror(avahi_server_errno
1147
(((mandos_context*)mc)->server)));
1148
avahi_simple_poll_quit(simple_poll);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1149
1076
return;
1150
1077
1151
1078
case AVAHI_BROWSER_NEW:
1154
1081
the callback function is called the Avahi server will free the
1155
1082
resolver for us. */
1156
1083
1157
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1158
interface, protocol, name, type,
1159
domain, protocol, 0,
1160
resolve_callback, mc) == NULL)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1161
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1162
1088
" %s\n", name,
1163
avahi_strerror(avahi_server_errno
1164
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1165
1090
break;
1166
1091
1167
1092
case AVAHI_BROWSER_REMOVE:
1186
1111
signal_received = sig;
1187
1112
int old_errno = errno;
1188
1113
/* set main loop to exit */
1189
if(simple_poll != NULL){
1190
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1191
1116
}
1192
1117
errno = old_errno;
1193
1118
}
1194
1119
1195
__attribute__((nonnull, warn_unused_result))
1196
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1197
1121
int ret;
1198
error_t ret_errno;
1199
1122
1200
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
1124
if(s < 0){
1202
ret_errno = errno;
1203
1125
perror_plus("socket");
1204
errno = ret_errno;
1205
1126
return false;
1206
1127
}
1207
1128
strcpy(ifr->ifr_name, ifname);
1208
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1209
1130
if(ret == -1){
1210
1131
if(debug){
1211
ret_errno = errno;
1212
1132
perror_plus("ioctl SIOCGIFFLAGS");
1213
errno = ret_errno;
1214
1133
}
1215
1134
return false;
1216
1135
}
1217
1136
return true;
1218
1137
}
1219
1138
1220
__attribute__((nonnull, warn_unused_result))
1221
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1222
1140
1223
1141
/* Reject the loopback device */
1265
1183
* corresponds to an acceptable network device.
1266
1184
* (This function is passed to scandir(3) as a filter function.)
1267
1185
*/
1268
__attribute__((nonnull, warn_unused_result))
1269
1186
int good_interface(const struct dirent *if_entry){
1270
1187
if(if_entry->d_name[0] == '.'){
1271
1188
return 0;
1287
1204
}
1288
1205
1289
1206
/*
1290
* This function determines if a network interface is up.
1291
*/
1292
__attribute__((nonnull, warn_unused_result))
1293
bool interface_is_up(const char *interface){
1294
struct ifreq ifr;
1295
if(not get_flags(interface, &ifr)){
1296
if(debug){
1297
fprintf_plus(stderr, "Failed to get flags for interface "
1298
"\"%s\"\n", interface);
1299
}
1300
return false;
1301
}
1302
1303
return (bool)(ifr.ifr_flags & IFF_UP);
1304
}
1305
1306
/*
1307
* This function determines if a network interface is running
1308
*/
1309
__attribute__((nonnull, warn_unused_result))
1310
bool interface_is_running(const char *interface){
1311
struct ifreq ifr;
1312
if(not get_flags(interface, &ifr)){
1313
if(debug){
1314
fprintf_plus(stderr, "Failed to get flags for interface "
1315
"\"%s\"\n", interface);
1316
}
1317
return false;
1318
}
1319
1320
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1321
}
1322
1323
__attribute__((nonnull, pure, warn_unused_result))
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1324
1249
int notdotentries(const struct dirent *direntry){
1325
1250
/* Skip "." and ".." */
1326
1251
if(direntry->d_name[0] == '.'
1333
1258
}
1334
1259
1335
1260
/* Is this directory entry a runnable program? */
1336
__attribute__((nonnull, warn_unused_result))
1337
1261
int runnable_hook(const struct dirent *direntry){
1338
1262
int ret;
1339
1263
size_t sret;
1347
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1348
1272
"abcdefghijklmnopqrstuvwxyz"
1349
1273
"0123456789"
1350
"_.-");
1274
"_-");
1351
1275
if((direntry->d_name)[sret] != '\0'){
1352
1276
/* Contains non-allowed characters */
1353
1277
if(debug){
1357
1281
return 0;
1358
1282
}
1359
1283
1360
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1361
1292
if(ret == -1){
1362
1293
if(debug){
1363
1294
perror_plus("Could not stat hook");
1387
1318
return 1;
1388
1319
}
1389
1320
1390
__attribute__((nonnull, warn_unused_result))
1391
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1392
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1393
1322
int ret;
1394
1323
struct timespec now;
1395
1324
struct timespec waited_time;
1396
1325
intmax_t block_time;
1397
1326
1398
1327
while(true){
1399
if(mc->current_server == NULL){
1400
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1401
1330
fprintf_plus(stderr, "Wait until first server is found."
1402
1331
" No timeout!\n");
1403
1332
}
1404
1333
ret = avahi_simple_poll_iterate(s, -1);
1405
1334
} else {
1406
if(debug){
1335
if (debug){
1407
1336
fprintf_plus(stderr, "Check current_server if we should run"
1408
1337
" it, or wait\n");
1409
1338
}
1416
1345
/* Calculating in ms how long time between now and server
1417
1346
who we visted longest time ago. Now - last seen. */
1418
1347
waited_time.tv_sec = (now.tv_sec
1419
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1420
1349
waited_time.tv_nsec = (now.tv_nsec
1421
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1422
1351
/* total time is 10s/10,000ms.
1423
1352
Converting to s from ms by dividing by 1,000,
1424
1353
and ns to ms by dividing by 1,000,000. */
1426
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1427
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1428
1357
1429
if(debug){
1358
if (debug){
1430
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
1360
block_time);
1432
1361
}
1433
1362
1434
1363
if(block_time <= 0){
1435
ret = start_mandos_communication(mc->current_server->ip,
1436
mc->current_server->port,
1437
mc->current_server->if_index,
1438
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1439
1368
if(ret == 0){
1440
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1441
1370
return 0;
1442
1371
}
1443
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1444
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1445
1374
if(ret == -1){
1446
1375
perror_plus("clock_gettime");
1447
1376
return -1;
1448
1377
}
1449
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1450
1379
block_time = 0; /* Call avahi to find new Mandos
1451
1380
servers, but don't block */
1452
1381
}
1454
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1455
1384
}
1456
1385
if(ret != 0){
1457
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1458
1387
return (ret != 1) ? ret : 0;
1459
1388
}
1460
1389
}
1461
1390
}
1462
1391
}
1463
1392
1464
/* Set effective uid to 0, return errno */
1465
__attribute__((warn_unused_result))
1466
error_t raise_privileges(void){
1467
error_t old_errno = errno;
1468
error_t ret_errno = 0;
1469
if(seteuid(0) == -1){
1470
ret_errno = errno;
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Set effective and real user ID to 0. Return errno. */
1477
__attribute__((warn_unused_result))
1478
error_t raise_privileges_permanently(void){
1479
error_t old_errno = errno;
1480
error_t ret_errno = raise_privileges();
1481
if(ret_errno != 0){
1482
errno = old_errno;
1483
return ret_errno;
1484
}
1485
if(setuid(0) == -1){
1486
ret_errno = errno;
1487
}
1488
errno = old_errno;
1489
return ret_errno;
1490
}
1491
1492
/* Set effective user ID to unprivileged saved user ID */
1493
__attribute__((warn_unused_result))
1494
error_t lower_privileges(void){
1495
error_t old_errno = errno;
1496
error_t ret_errno = 0;
1497
if(seteuid(uid) == -1){
1498
ret_errno = errno;
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1393
bool run_network_hooks(const char *mode, const char *interface,
1518
1394
const float delay){
1519
struct dirent **direntries = NULL;
1520
if(hookdir_fd == -1){
1521
hookdir_fd = open(hookdir, O_RDONLY);
1522
if(hookdir_fd == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("open");
1530
}
1531
return;
1532
}
1533
}
1534
#ifdef __GLIBC__
1535
#if __GLIBC_PREREQ(2, 15)
1536
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1537
runnable_hook, alphasort);
1538
#else /* not __GLIBC_PREREQ(2, 15) */
1539
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1540
alphasort);
1541
#endif /* not __GLIBC_PREREQ(2, 15) */
1542
#else /* not __GLIBC__ */
1543
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1544
alphasort);
1545
#endif /* not __GLIBC__ */
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1546
1400
if(numhooks == -1){
1547
1401
perror_plus("scandir");
1548
return;
1549
}
1550
struct dirent *direntry;
1551
int ret;
1552
int devnull = open("/dev/null", O_RDONLY);
1553
for(int i = 0; i < numhooks; i++){
1554
direntry = direntries[i];
1555
if(debug){
1556
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1557
direntry->d_name);
1558
}
1559
pid_t hook_pid = fork();
1560
if(hook_pid == 0){
1561
/* Child */
1562
/* Raise privileges */
1563
errno = raise_privileges_permanently();
1564
if(errno != 0){
1565
perror_plus("Failed to raise privileges");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Set group */
1569
errno = 0;
1570
ret = setgid(0);
1571
if(ret == -1){
1572
perror_plus("setgid");
1573
_exit(EX_NOPERM);
1574
}
1575
/* Reset supplementary groups */
1576
errno = 0;
1577
ret = setgroups(0, NULL);
1578
if(ret == -1){
1579
perror_plus("setgroups");
1580
_exit(EX_NOPERM);
1581
}
1582
ret = dup2(devnull, STDIN_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(devnull, STDIN_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = close(devnull);
1588
if(ret == -1){
1589
perror_plus("close");
1590
_exit(EX_OSERR);
1591
}
1592
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1593
if(ret == -1){
1594
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("DEVICE", interface, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1608
if(ret == -1){
1609
perror_plus("setenv");
1610
_exit(EX_OSERR);
1611
}
1612
ret = setenv("MODE", mode, 1);
1613
if(ret == -1){
1614
perror_plus("setenv");
1615
_exit(EX_OSERR);
1616
}
1617
char *delaystring;
1618
ret = asprintf(&delaystring, "%f", (double)delay);
1619
if(ret == -1){
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1620
1409
perror_plus("asprintf");
1621
_exit(EX_OSERR);
1622
}
1623
ret = setenv("DELAY", delaystring, 1);
1624
if(ret == -1){
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1625
1478
free(delaystring);
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
free(delaystring);
1630
if(connect_to != NULL){
1631
ret = setenv("CONNECT", connect_to, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
}
1637
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1638
if(hook_fd == -1){
1639
perror_plus("openat");
1640
_exit(EXIT_FAILURE);
1641
}
1642
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1643
perror_plus("close");
1644
_exit(EXIT_FAILURE);
1645
}
1646
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1647
environ) == -1){
1648
perror_plus("fexecve");
1649
_exit(EXIT_FAILURE);
1650
}
1651
} else {
1652
int status;
1653
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1654
perror_plus("waitpid");
1655
continue;
1656
}
1657
if(WIFEXITED(status)){
1658
if(WEXITSTATUS(status) != 0){
1659
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1660
" with status %d\n", direntry->d_name,
1661
WEXITSTATUS(status));
1662
continue;
1663
}
1664
} else if(WIFSIGNALED(status)){
1665
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1666
" signal %d\n", direntry->d_name,
1667
WTERMSIG(status));
1668
continue;
1669
} else {
1670
fprintf_plus(stderr, "Warning: network hook \"%s\""
1671
" crashed\n", direntry->d_name);
1672
continue;
1673
}
1674
}
1675
if(debug){
1676
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1677
direntry->d_name);
1678
}
1679
}
1680
free(direntries);
1681
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1682
perror_plus("close");
1683
} else {
1684
hookdir_fd = -1;
1685
}
1686
close(devnull);
1687
}
1688
1689
__attribute__((nonnull, warn_unused_result))
1690
error_t bring_up_interface(const char *const interface,
1691
const float delay){
1692
error_t old_errno = errno;
1693
int ret;
1694
struct ifreq network;
1695
unsigned int if_index = if_nametoindex(interface);
1696
if(if_index == 0){
1697
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1698
errno = old_errno;
1699
return ENXIO;
1700
}
1701
1702
if(quit_now){
1703
errno = old_errno;
1704
return EINTR;
1705
}
1706
1707
if(not interface_is_up(interface)){
1708
error_t ret_errno = 0, ioctl_errno = 0;
1709
if(not get_flags(interface, &network)){
1710
ret_errno = errno;
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", interface);
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
network.ifr_flags |= IFF_UP; /* set flag */
1717
1718
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(sd == -1){
1720
ret_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return ret_errno;
1724
}
1725
1726
if(quit_now){
1727
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1728
if(ret == -1){
1729
perror_plus("close");
1730
}
1731
errno = old_errno;
1732
return EINTR;
1733
}
1734
1735
if(debug){
1736
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1737
interface);
1738
}
1739
1740
/* Raise privileges */
1741
ret_errno = raise_privileges();
1742
if(ret_errno != 0){
1743
errno = ret_errno;
1744
perror_plus("Failed to raise privileges");
1745
}
1746
1747
#ifdef __linux__
1748
int ret_linux;
1749
bool restore_loglevel = false;
1750
if(ret_errno == 0){
1751
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1752
messages about the network interface to mess up the prompt */
1753
ret_linux = klogctl(8, NULL, 5);
1754
if(ret_linux == -1){
1755
perror_plus("klogctl");
1756
} else {
1757
restore_loglevel = true;
1758
}
1759
}
1760
#endif /* __linux__ */
1761
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
ioctl_errno = errno;
1763
#ifdef __linux__
1764
if(restore_loglevel){
1765
ret_linux = klogctl(7, NULL, 0);
1766
if(ret_linux == -1){
1767
perror_plus("klogctl");
1768
}
1769
}
1770
#endif /* __linux__ */
1771
1772
/* If raise_privileges() succeeded above */
1773
if(ret_errno == 0){
1774
/* Lower privileges */
1775
ret_errno = lower_privileges();
1776
if(ret_errno != 0){
1777
errno = ret_errno;
1778
perror_plus("Failed to lower privileges");
1779
}
1780
}
1781
1782
/* Close the socket */
1783
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1784
if(ret == -1){
1785
perror_plus("close");
1786
}
1787
1788
if(ret_setflags == -1){
1789
errno = ioctl_errno;
1790
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1791
errno = old_errno;
1792
return ioctl_errno;
1793
}
1794
} else if(debug){
1795
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1796
interface);
1797
}
1798
1799
/* Sleep checking until interface is running.
1800
Check every 0.25s, up to total time of delay */
1801
for(int i=0; i < delay * 4; i++){
1802
if(interface_is_running(interface)){
1803
break;
1804
}
1805
struct timespec sleeptime = { .tv_nsec = 250000000 };
1806
ret = nanosleep(&sleeptime, NULL);
1807
if(ret == -1 and errno != EINTR){
1808
perror_plus("nanosleep");
1809
}
1810
}
1811
1812
errno = old_errno;
1813
return 0;
1814
}
1815
1816
__attribute__((nonnull, warn_unused_result))
1817
error_t take_down_interface(const char *const interface){
1818
error_t old_errno = errno;
1819
struct ifreq network;
1820
unsigned int if_index = if_nametoindex(interface);
1821
if(if_index == 0){
1822
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1823
errno = old_errno;
1824
return ENXIO;
1825
}
1826
if(interface_is_up(interface)){
1827
error_t ret_errno = 0, ioctl_errno = 0;
1828
if(not get_flags(interface, &network) and debug){
1829
ret_errno = errno;
1830
fprintf_plus(stderr, "Failed to get flags for interface "
1831
"\"%s\"\n", interface);
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1836
1837
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1838
if(sd == -1){
1839
ret_errno = errno;
1840
perror_plus("socket");
1841
errno = old_errno;
1842
return ret_errno;
1843
}
1844
1845
if(debug){
1846
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1847
interface);
1848
}
1849
1850
/* Raise privileges */
1851
ret_errno = raise_privileges();
1852
if(ret_errno != 0){
1853
errno = ret_errno;
1854
perror_plus("Failed to raise privileges");
1855
}
1856
1857
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1858
ioctl_errno = errno;
1859
1860
/* If raise_privileges() succeeded above */
1861
if(ret_errno == 0){
1862
/* Lower privileges */
1863
ret_errno = lower_privileges();
1864
if(ret_errno != 0){
1865
errno = ret_errno;
1866
perror_plus("Failed to lower privileges");
1867
}
1868
}
1869
1870
/* Close the socket */
1871
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1872
if(ret == -1){
1873
perror_plus("close");
1874
}
1875
1876
if(ret_setflags == -1){
1877
errno = ioctl_errno;
1878
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1879
errno = old_errno;
1880
return ioctl_errno;
1881
}
1882
} else if(debug){
1883
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1884
interface);
1885
}
1886
1887
errno = old_errno;
1888
return 0;
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1889
1527
}
1890
1528
1891
1529
int main(int argc, char *argv[]){
1892
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1893
.priority = "SECURE256:!CTYPE-X.509:"
1894
"+CTYPE-OPENPGP", .current_server = NULL,
1895
.interfaces = NULL, .interfaces_size = 0 };
1896
1530
AvahiSServiceBrowser *sb = NULL;
1897
error_t ret_errno;
1531
int error;
1898
1532
int ret;
1899
1533
intmax_t tmpmax;
1900
1534
char *tmp;
1901
1535
int exitcode = EXIT_SUCCESS;
1902
char *interfaces_to_take_down = NULL;
1903
size_t interfaces_to_take_down_size = 0;
1904
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1905
char old_tempdir[] = "/tmp/mandosXXXXXX";
1906
char *tempdir = NULL;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
1907
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1908
1545
const char *seckey = PATHDIR "/" SECKEY;
1909
1546
const char *pubkey = PATHDIR "/" PUBKEY;
1910
char *interfaces_hooks = NULL;
1911
1547
1912
1548
bool gnutls_initialized = false;
1913
1549
bool gpgme_initialized = false;
2004
1640
connect_to = arg;
2005
1641
break;
2006
1642
case 'i': /* --interface */
2007
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2008
arg, (int)',');
2009
if(ret_errno != 0){
2010
argp_error(state, "%s", strerror(ret_errno));
2011
}
1643
interface = arg;
2012
1644
break;
2013
1645
case 's': /* --seckey */
2014
1646
seckey = arg;
2091
1723
/* Work around Debian bug #633582:
2092
1724
<http://bugs.debian.org/633582> */
2093
1725
2094
/* Re-raise privileges */
2095
ret_errno = raise_privileges();
2096
if(ret_errno != 0){
2097
errno = ret_errno;
2098
perror_plus("Failed to raise privileges");
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2099
1731
} else {
2100
1732
struct stat st;
2101
1733
2142
1774
}
2143
1775
2144
1776
/* Lower privileges */
2145
ret_errno = lower_privileges();
2146
if(ret_errno != 0){
2147
errno = ret_errno;
2148
perror_plus("Failed to lower privileges");
2149
}
2150
}
2151
}
2152
2153
/* Remove invalid interface names (except "none") */
2154
{
2155
char *interface = NULL;
2156
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2157
interface))){
2158
if(strcmp(interface, "none") != 0
2159
and if_nametoindex(interface) == 0){
2160
if(interface[0] != '\0'){
2161
fprintf_plus(stderr, "Not using nonexisting interface"
2162
" \"%s\"\n", interface);
2163
}
2164
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2165
interface = NULL;
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2166
1781
}
2167
1782
}
2168
1783
}
2169
1784
2170
1785
/* Run network hooks */
2171
{
2172
if(mc.interfaces != NULL){
2173
interfaces_hooks = malloc(mc.interfaces_size);
2174
if(interfaces_hooks == NULL){
2175
perror_plus("malloc");
2176
goto end;
2177
}
2178
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2179
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2180
}
2181
run_network_hooks("start", interfaces_hooks != NULL ?
2182
interfaces_hooks : "", delay);
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2183
1788
}
2184
1789
2185
1790
if(not debug){
2186
1791
avahi_set_log_function(empty_log);
2187
1792
}
2188
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
2189
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2190
1827
from the signal handler */
2191
1828
/* Initialize the pseudo-RNG for Avahi */
2192
1829
srand((unsigned int) time(NULL));
2193
simple_poll = avahi_simple_poll_new();
2194
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2195
1832
fprintf_plus(stderr,
2196
1833
"Avahi: Failed to create simple poll object.\n");
2197
1834
exitcode = EX_UNAVAILABLE;
2261
1898
}
2262
1899
}
2263
1900
2264
/* If no interfaces were specified, make a list */
2265
if(mc.interfaces == NULL){
2266
struct dirent **direntries = NULL;
2267
/* Look for any good interfaces */
2268
ret = scandir(sys_class_net, &direntries, good_interface,
2269
alphasort);
2270
if(ret >= 1){
2271
/* Add all found interfaces to interfaces list */
2272
for(int i = 0; i < ret; ++i){
2273
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2274
direntries[i]->d_name);
2275
if(ret_errno != 0){
2276
errno = ret_errno;
2277
perror_plus("argz_add");
2278
continue;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2282
direntries[i]->d_name);
2283
}
2284
}
2285
free(direntries);
2286
} else {
2287
if(ret == 0){
2288
free(direntries);
2289
}
2290
fprintf_plus(stderr, "Could not find a network interface\n");
2291
exitcode = EXIT_FAILURE;
2292
goto end;
2293
}
2294
}
2295
2296
/* Bring up interfaces which are down, and remove any "none"s */
2297
{
2298
char *interface = NULL;
2299
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2300
interface))){
2301
/* If interface name is "none", stop bringing up interfaces.
2302
Also remove all instances of "none" from the list */
2303
if(strcmp(interface, "none") == 0){
2304
argz_delete(&mc.interfaces, &mc.interfaces_size,
2305
interface);
2306
interface = NULL;
2307
while((interface = argz_next(mc.interfaces,
2308
mc.interfaces_size, interface))){
2309
if(strcmp(interface, "none") == 0){
2310
argz_delete(&mc.interfaces, &mc.interfaces_size,
2311
interface);
2312
interface = NULL;
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2313
1986
}
2314
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2315
2005
break;
2316
2006
}
2317
bool interface_was_up = interface_is_up(interface);
2318
errno = bring_up_interface(interface, delay);
2319
if(not interface_was_up){
2320
if(errno != 0){
2321
perror_plus("Failed to bring up interface");
2322
} else {
2323
errno = argz_add(&interfaces_to_take_down,
2324
&interfaces_to_take_down_size,
2325
interface);
2326
if(errno != 0){
2327
perror_plus("argz_add");
2328
}
2329
}
2330
}
2331
}
2332
if(debug and (interfaces_to_take_down == NULL)){
2333
fprintf_plus(stderr, "No interfaces were brought up\n");
2334
}
2335
}
2336
2337
/* If we only got one interface, explicitly use only that one */
2338
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2339
if(debug){
2340
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2341
mc.interfaces);
2342
}
2343
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2344
2036
}
2345
2037
2346
2038
if(quit_now){
2347
2039
goto end;
2348
2040
}
2349
2041
2350
ret = init_gnutls_global(pubkey, seckey, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2351
2043
if(ret == -1){
2352
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2353
2045
exitcode = EX_UNAVAILABLE;
2360
2052
goto end;
2361
2053
}
2362
2054
2363
/* Try /run/tmp before /tmp */
2364
tempdir = mkdtemp(run_tempdir);
2365
if(tempdir == NULL and errno == ENOENT){
2366
if(debug){
2367
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2368
run_tempdir, old_tempdir);
2369
}
2370
tempdir = mkdtemp(old_tempdir);
2371
}
2372
if(tempdir == NULL){
2055
if(mkdtemp(tempdir) == NULL){
2373
2056
perror_plus("mkdtemp");
2374
2057
goto end;
2375
2058
}
2059
tempdir_created = true;
2376
2060
2377
2061
if(quit_now){
2378
2062
goto end;
2379
2063
}
2380
2064
2381
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2382
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2383
2067
exitcode = EX_UNAVAILABLE;
2384
2068
goto end;
2394
2078
/* Connect directly, do not use Zeroconf */
2395
2079
/* (Mainly meant for debugging) */
2396
2080
char *address = strrchr(connect_to, ':');
2397
2398
2081
if(address == NULL){
2399
2082
fprintf_plus(stderr, "No colon in address\n");
2400
2083
exitcode = EX_USAGE;
2405
2088
goto end;
2406
2089
}
2407
2090
2408
in_port_t port;
2091
uint16_t port;
2409
2092
errno = 0;
2410
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2411
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2412
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2413
2096
fprintf_plus(stderr, "Bad port number\n");
2414
2097
exitcode = EX_USAGE;
2415
2098
goto end;
2416
2099
}
2417
2100
2418
2101
if(quit_now){
2419
2102
goto end;
2420
2103
}
2421
2104
2422
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2423
2106
*address = '\0';
2424
2107
/* Colon in address indicates IPv6 */
2425
2108
int af;
2441
2124
}
2442
2125
2443
2126
while(not quit_now){
2444
ret = start_mandos_communication(address, port, if_index, af,
2445
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2446
2128
if(quit_now or ret == 0){
2447
2129
break;
2448
2130
}
2450
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2451
2133
(int)retry_interval);
2452
2134
}
2453
sleep((unsigned int)retry_interval);
2135
sleep((int)retry_interval);
2454
2136
}
2455
2137
2456
if(not quit_now){
2138
if (not quit_now){
2457
2139
exitcode = EXIT_SUCCESS;
2458
2140
}
2459
2141
2474
2156
config.publish_domain = 0;
2475
2157
2476
2158
/* Allocate a new server */
2477
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2478
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2479
2162
2480
2163
/* Free the Avahi configuration data */
2481
2164
avahi_server_config_free(&config);
2484
2167
/* Check if creating the Avahi server object succeeded */
2485
2168
if(mc.server == NULL){
2486
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2487
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2488
2171
exitcode = EX_UNAVAILABLE;
2489
2172
goto end;
2490
2173
}
2496
2179
/* Create the Avahi service browser */
2497
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2498
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2499
NULL, 0, browse_callback,
2500
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2501
2183
if(sb == NULL){
2502
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2503
2185
avahi_strerror(avahi_server_errno(mc.server)));
2514
2196
if(debug){
2515
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2516
2198
}
2517
2518
ret = avahi_loop_with_timeout(simple_poll,
2519
(int)(retry_interval * 1000), &mc);
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2520
2202
if(debug){
2521
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2522
2204
(ret == 0) ? "successfully" : "with error");
2529
2211
}
2530
2212
2531
2213
/* Cleanup things */
2532
free(mc.interfaces);
2533
2534
2214
if(sb != NULL)
2535
2215
avahi_s_service_browser_free(sb);
2536
2216
2537
2217
if(mc.server != NULL)
2538
2218
avahi_server_free(mc.server);
2539
2219
2540
if(simple_poll != NULL)
2541
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2542
2222
2543
2223
if(gnutls_initialized){
2544
2224
gnutls_certificate_free_credentials(mc.cred);
2556
2236
mc.current_server->prev->next = NULL;
2557
2237
while(mc.current_server != NULL){
2558
2238
server *next = mc.current_server->next;
2559
#ifdef __GNUC__
2560
#pragma GCC diagnostic push
2561
#pragma GCC diagnostic ignored "-Wcast-qual"
2562
#endif
2563
free((char *)(mc.current_server->ip));
2564
#ifdef __GNUC__
2565
#pragma GCC diagnostic pop
2566
#endif
2567
2239
free(mc.current_server);
2568
2240
mc.current_server = next;
2569
2241
}
2570
2242
}
2571
2243
2572
/* Re-raise privileges */
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2573
2248
{
2574
ret_errno = raise_privileges();
2575
if(ret_errno != 0){
2576
errno = ret_errno;
2577
perror_plus("Failed to raise privileges");
2578
} else {
2579
2580
/* Run network hooks */
2581
run_network_hooks("stop", interfaces_hooks != NULL ?
2582
interfaces_hooks : "", delay);
2583
2584
/* Take down the network interfaces which were brought up */
2585
{
2586
char *interface = NULL;
2587
while((interface=argz_next(interfaces_to_take_down,
2588
interfaces_to_take_down_size,
2589
interface))){
2590
ret_errno = take_down_interface(interface);
2591
if(ret_errno != 0){
2592
errno = ret_errno;
2593
perror_plus("Failed to take down interface");
2594
}
2595
}
2596
if(debug and (interfaces_to_take_down == NULL)){
2597
fprintf_plus(stderr, "No interfaces needed to be taken"
2598
" down\n");
2599
}
2600
}
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2601
2253
}
2602
2254
2603
ret_errno = lower_privileges_permanently();
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to lower privileges permanently");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2607
2271
}
2608
2272
}
2609
2610
free(interfaces_to_take_down);
2611
free(interfaces_hooks);
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2612
2279
2613
2280
/* Removes the GPGME temp directory and all files inside */
2614
if(tempdir != NULL){
2281
if(tempdir_created){
2615
2282
struct dirent **direntries = NULL;
2616
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2617
O_NOFOLLOW));
2618
if(tempdir_fd == -1){
2619
perror_plus("open");
2620
} else {
2621
#ifdef __GLIBC__
2622
#if __GLIBC_PREREQ(2, 15)
2623
int numentries = scandirat(tempdir_fd, ".", &direntries,
2624
notdotentries, alphasort);
2625
#else /* not __GLIBC_PREREQ(2, 15) */
2626
int numentries = scandir(tempdir, &direntries, notdotentries,
2627
alphasort);
2628
#endif /* not __GLIBC_PREREQ(2, 15) */
2629
#else /* not __GLIBC__ */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC__ */
2633
if(numentries >= 0){
2634
for(int i = 0; i < numentries; i++){
2635
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2636
if(ret == -1){
2637
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2638
" \"%s\", 0): %s\n", tempdir,
2639
direntries[i]->d_name, strerror(errno));
2640
}
2641
}
2642
2643
/* need to clean even if 0 because man page doesn't specify */
2644
free(direntries);
2645
if(numentries == -1){
2646
perror_plus("scandir");
2647
}
2648
ret = rmdir(tempdir);
2649
if(ret == -1 and errno != ENOENT){
2650
perror_plus("rmdir");
2651
}
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
2652
2302
}
2653
TEMP_FAILURE_RETRY(close(tempdir_fd));
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2654
2313
}
2655
2314
}
2656
2315
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0