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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
137
146
138
147
/* Doubly linked list that need to be circularly linked when used */
139
148
typedef struct server{
140
149
const char *ip;
141
uint16_t port;
150
in_port_t port;
142
151
AvahiIfIndex if_index;
143
152
int af;
144
153
struct timespec last_seen;
148
157
149
158
/* Used for passing in values through the Avahi callback functions */
150
159
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
160
AvahiServer *server;
153
161
gnutls_certificate_credentials_t cred;
154
162
unsigned int dh_bits;
156
164
const char *priority;
157
165
gpgme_ctx_t ctx;
158
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
159
169
} mandos_context;
160
170
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
166
173
167
174
sig_atomic_t quit_now = 0;
168
175
int signal_received = 0;
169
176
170
177
/* Function to use when printing errors */
171
178
void perror_plus(const char *print_text){
179
int e = errno;
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
182
errno = e;
174
183
perror(print_text);
175
184
}
176
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
187
int fprintf_plus(FILE *stream, const char *format, ...){
178
188
va_list ap;
179
189
va_start (ap, format);
180
190
181
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
192
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
194
}
185
195
186
196
/*
188
198
* bytes. "buffer_capacity" is how much is currently allocated,
189
199
* "buffer_length" is how much is already used.
190
200
*/
201
__attribute__((nonnull, warn_unused_result))
191
202
size_t incbuffer(char **buffer, size_t buffer_length,
192
203
size_t buffer_capacity){
193
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
196
211
return 0;
197
212
}
213
*buffer = new_buf;
198
214
buffer_capacity += BUFFER_SIZE;
199
215
}
200
216
return buffer_capacity;
201
217
}
202
218
203
219
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
206
223
int ret;
207
224
server *new_server = malloc(sizeof(server));
208
225
if(new_server == NULL){
209
226
perror_plus("malloc");
210
return -1;
227
return false;
211
228
}
212
229
*new_server = (server){ .ip = strdup(ip),
213
230
.port = port,
215
232
.af = af };
216
233
if(new_server->ip == NULL){
217
234
perror_plus("strdup");
218
return -1;
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
219
241
}
220
242
/* Special case of first server */
221
if (mc.current_server == NULL){
243
if(*current_server == NULL){
222
244
new_server->next = new_server;
223
245
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
246
*current_server = new_server;
226
247
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
229
251
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
252
(*current_server)->prev = new_server;
253
}
254
return true;
238
255
}
239
256
240
257
/*
241
258
* Initialize GPGME.
242
259
*/
260
__attribute__((nonnull, warn_unused_result))
243
261
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
262
const char *tempdir, mandos_context *mc){
245
263
gpgme_error_t rc;
246
264
gpgme_engine_info_t engine_info;
247
265
248
249
266
/*
250
267
* Helper function to insert pub and seckey to the engine keyring.
251
268
*/
267
284
return false;
268
285
}
269
286
270
rc = gpgme_op_import(mc.ctx, pgp_data);
287
rc = gpgme_op_import(mc->ctx, pgp_data);
271
288
if(rc != GPG_ERR_NO_ERROR){
272
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
290
gpgme_strsource(rc), gpgme_strerror(rc));
317
334
}
318
335
319
336
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
337
rc = gpgme_new(&(mc->ctx));
321
338
if(rc != GPG_ERR_NO_ERROR){
322
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
336
353
* Decrypt OpenPGP data.
337
354
* Returns -1 on error
338
355
*/
356
__attribute__((nonnull, warn_unused_result))
339
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
358
size_t crypto_size,
341
char **plaintext){
359
char **plaintext,
360
mandos_context *mc){
342
361
gpgme_data_t dh_crypto, dh_plain;
343
362
gpgme_error_t rc;
344
363
ssize_t ret;
370
389
371
390
/* Decrypt data from the cryptotext data buffer to the plaintext
372
391
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
393
if(rc != GPG_ERR_NO_ERROR){
375
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
395
gpgme_strsource(rc), gpgme_strerror(rc));
377
396
plaintext_length = -1;
378
397
if(debug){
379
398
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
399
result = gpgme_op_decrypt_result(mc->ctx);
381
400
if(result == NULL){
382
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
402
} else {
460
479
return plaintext_length;
461
480
}
462
481
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
466
485
if(ret == NULL)
467
486
ret = "(unknown)";
468
487
return ret;
469
488
}
470
489
471
490
/* GnuTLS log function callback */
491
__attribute__((nonnull))
472
492
static void debuggnutls(__attribute__((unused)) int level,
473
493
const char* string){
474
494
fprintf_plus(stderr, "GnuTLS: %s", string);
475
495
}
476
496
497
__attribute__((nonnull, warn_unused_result))
477
498
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
499
const char *seckeyfilename,
500
mandos_context *mc){
479
501
int ret;
480
502
481
503
if(debug){
498
520
}
499
521
500
522
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
524
if(ret != GNUTLS_E_SUCCESS){
503
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
526
safer_gnutls_strerror(ret));
514
536
}
515
537
516
538
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
539
(mc->cred, pubkeyfilename, seckeyfilename,
518
540
GNUTLS_OPENPGP_FMT_BASE64);
519
541
if(ret != GNUTLS_E_SUCCESS){
520
542
fprintf_plus(stderr,
526
548
}
527
549
528
550
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
551
ret = gnutls_dh_params_init(&mc->dh_params);
530
552
if(ret != GNUTLS_E_SUCCESS){
531
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
554
" initialization: %s\n",
533
555
safer_gnutls_strerror(ret));
534
556
goto globalfail;
535
557
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
559
if(ret != GNUTLS_E_SUCCESS){
538
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
561
safer_gnutls_strerror(ret));
540
562
goto globalfail;
541
563
}
542
564
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
566
545
567
return 0;
546
568
547
569
globalfail:
548
570
549
gnutls_certificate_free_credentials(mc.cred);
571
gnutls_certificate_free_credentials(mc->cred);
550
572
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
573
gnutls_dh_params_deinit(mc->dh_params);
552
574
return -1;
553
575
}
554
576
555
static int init_gnutls_session(gnutls_session_t *session){
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
556
580
int ret;
557
581
/* GnuTLS session creation */
558
582
do {
570
594
{
571
595
const char *err;
572
596
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
598
if(quit_now){
575
599
gnutls_deinit(*session);
576
600
return -1;
587
611
588
612
do {
589
613
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
614
mc->cred);
591
615
if(quit_now){
592
616
gnutls_deinit(*session);
593
617
return -1;
603
627
/* ignore client certificate if any. */
604
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
629
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
631
608
632
return 0;
609
633
}
613
637
__attribute__((unused)) const char *txt){}
614
638
615
639
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
617
642
AvahiIfIndex if_index,
618
int af){
643
int af, mandos_context *mc){
619
644
int ret, tcp_sd = -1;
620
645
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
646
struct sockaddr_storage to;
625
647
char *buffer = NULL;
626
648
char *decrypted_buffer = NULL;
627
649
size_t buffer_length = 0;
651
673
return -1;
652
674
}
653
675
654
ret = init_gnutls_session(&session);
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
655
709
if(ret != 0){
656
710
return -1;
657
711
}
658
712
659
713
if(debug){
660
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
715
PRIuMAX "\n", ip, (uintmax_t)port);
662
716
}
663
717
664
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
676
730
677
731
memset(&to, 0, sizeof(to));
678
732
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
681
735
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
684
738
}
685
739
if(ret < 0 ){
686
740
int e = errno;
695
749
goto mandos_end;
696
750
}
697
751
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
755
if(if_index == AVAHI_IF_UNSPEC){
706
756
fprintf_plus(stderr, "An IPv6 link-local address is"
707
757
" incomplete without a network interface\n");
709
759
goto mandos_end;
710
760
}
711
761
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
763
}
714
764
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
766
}
719
767
720
768
if(quit_now){
728
776
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
777
perror_plus("if_indextoname");
730
778
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
733
781
}
734
782
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
737
785
}
738
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
788
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
744
793
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
747
798
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
805
}
755
806
}
756
807
760
811
}
761
812
762
813
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
764
816
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
766
819
}
767
820
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
822
int e = errno;
770
823
perror_plus("connect");
771
824
errno = e;
817
870
goto mandos_end;
818
871
}
819
872
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
878
823
879
if(quit_now){
824
880
errno = EINTR;
929
985
if(buffer_length > 0){
930
986
ssize_t decrypted_buffer_size;
931
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
988
&decrypted_buffer, mc);
933
989
if(decrypted_buffer_size >= 0){
934
990
935
991
written = 0;
983
1039
return retval;
984
1040
}
985
1041
1042
__attribute__((nonnull))
986
1043
static void resolve_callback(AvahiSServiceResolver *r,
987
1044
AvahiIfIndex interface,
988
1045
AvahiProtocol proto,
996
1053
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1055
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
1001
1060
1002
1061
/* Called whenever a service has been resolved successfully or
1003
1062
timed out */
1012
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1073
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
1016
1076
break;
1017
1077
1018
1078
case AVAHI_RESOLVER_FOUND:
1024
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1085
host_name, ip, (intmax_t)interface, port);
1026
1086
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
1029
1091
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1092
avahi_simple_poll_quit(simple_poll);
1031
1093
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
1034
1100
}
1035
1101
}
1036
1102
}
1046
1112
const char *domain,
1047
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1114
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
1051
1119
1052
1120
/* Called whenever a new services becomes available on the LAN or
1053
1121
is removed from the LAN */
1061
1129
case AVAHI_BROWSER_FAILURE:
1062
1130
1063
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
1066
1135
return;
1067
1136
1068
1137
case AVAHI_BROWSER_NEW:
1071
1140
the callback function is called the Avahi server will free the
1072
1141
resolver for us. */
1073
1142
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1077
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1148
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
1080
1151
break;
1081
1152
1082
1153
case AVAHI_BROWSER_REMOVE:
1101
1172
signal_received = sig;
1102
1173
int old_errno = errno;
1103
1174
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1106
1177
}
1107
1178
errno = old_errno;
1108
1179
}
1109
1180
1181
__attribute__((nonnull, warn_unused_result))
1110
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1183
int ret;
1184
error_t ret_errno;
1112
1185
1113
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1187
if(s < 0){
1188
ret_errno = errno;
1115
1189
perror_plus("socket");
1190
errno = ret_errno;
1116
1191
return false;
1117
1192
}
1118
1193
strcpy(ifr->ifr_name, ifname);
1119
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1195
if(ret == -1){
1121
1196
if(debug){
1197
ret_errno = errno;
1122
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1123
1200
}
1124
1201
return false;
1125
1202
}
1126
1203
return true;
1127
1204
}
1128
1205
1206
__attribute__((nonnull, warn_unused_result))
1129
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1208
1131
1209
/* Reject the loopback device */
1173
1251
* corresponds to an acceptable network device.
1174
1252
* (This function is passed to scandir(3) as a filter function.)
1175
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1176
1255
int good_interface(const struct dirent *if_entry){
1177
1256
if(if_entry->d_name[0] == '.'){
1178
1257
return 0;
1194
1273
}
1195
1274
1196
1275
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1239
1310
int notdotentries(const struct dirent *direntry){
1240
1311
/* Skip "." and ".." */
1241
1312
if(direntry->d_name[0] == '.'
1248
1319
}
1249
1320
1250
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1251
1323
int runnable_hook(const struct dirent *direntry){
1252
1324
int ret;
1253
1325
size_t sret;
1301
1373
}
1302
1374
return 0;
1303
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1304
1380
return 1;
1305
1381
}
1306
1382
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1308
1386
int ret;
1309
1387
struct timespec now;
1310
1388
struct timespec waited_time;
1311
1389
intmax_t block_time;
1312
1390
1313
1391
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1392
if(mc->current_server == NULL){
1393
if(debug){
1316
1394
fprintf_plus(stderr, "Wait until first server is found."
1317
1395
" No timeout!\n");
1318
1396
}
1319
1397
ret = avahi_simple_poll_iterate(s, -1);
1320
1398
} else {
1321
if (debug){
1399
if(debug){
1322
1400
fprintf_plus(stderr, "Check current_server if we should run"
1323
1401
" it, or wait\n");
1324
1402
}
1331
1409
/* Calculating in ms how long time between now and server
1332
1410
who we visted longest time ago. Now - last seen. */
1333
1411
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1412
- mc->current_server->last_seen.tv_sec);
1335
1413
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1414
- mc->current_server->last_seen.tv_nsec);
1337
1415
/* total time is 10s/10,000ms.
1338
1416
Converting to s from ms by dividing by 1,000,
1339
1417
and ns to ms by dividing by 1,000,000. */
1341
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1421
1344
if (debug){
1422
if(debug){
1345
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1424
block_time);
1347
1425
}
1348
1426
1349
1427
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1354
1432
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1433
avahi_simple_poll_quit(s);
1356
1434
return 0;
1357
1435
}
1358
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1437
&mc->current_server->last_seen);
1360
1438
if(ret == -1){
1361
1439
perror_plus("clock_gettime");
1362
1440
return -1;
1363
1441
}
1364
mc.current_server = mc.current_server->next;
1442
mc->current_server = mc->current_server->next;
1365
1443
block_time = 0; /* Call avahi to find new Mandos
1366
1444
servers, but don't block */
1367
1445
}
1369
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1448
}
1371
1449
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1450
if(ret > 0 or errno != EINTR){
1373
1451
return (ret != 1) ? ret : 0;
1374
1452
}
1375
1453
}
1376
1454
}
1377
1455
}
1378
1456
1379
bool run_network_hooks(const char *mode, const char *interface,
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1380
1515
const float delay){
1381
1516
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
1518
alphasort);
1386
1519
if(numhooks == -1){
1387
perror_plus("scandir");
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1388
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1389
1531
int devnull = open("/dev/null", O_RDONLY);
1390
1532
for(int i = 0; i < numhooks; i++){
1391
1533
direntry = direntries[i];
1402
1544
pid_t hook_pid = fork();
1403
1545
if(hook_pid == 0){
1404
1546
/* Child */
1405
dup2(devnull, STDIN_FILENO);
1406
close(devnull);
1407
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1408
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1409
1582
if(ret == -1){
1410
1583
perror_plus("setenv");
1411
return false;
1584
_exit(EX_OSERR);
1412
1585
}
1413
1586
ret = setenv("DEVICE", interface, 1);
1414
1587
if(ret == -1){
1415
1588
perror_plus("setenv");
1416
return false;
1589
_exit(EX_OSERR);
1417
1590
}
1418
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1419
1592
if(ret == -1){
1420
1593
perror_plus("setenv");
1421
return false;
1594
_exit(EX_OSERR);
1422
1595
}
1423
1596
ret = setenv("MODE", mode, 1);
1424
1597
if(ret == -1){
1425
1598
perror_plus("setenv");
1426
return false;
1599
_exit(EX_OSERR);
1427
1600
}
1428
1601
char *delaystring;
1429
ret = asprintf(&delaystring, "%f", delay);
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1430
1603
if(ret == -1){
1431
1604
perror_plus("asprintf");
1432
return false;
1605
_exit(EX_OSERR);
1433
1606
}
1434
1607
ret = setenv("DELAY", delaystring, 1);
1435
1608
if(ret == -1){
1436
1609
free(delaystring);
1437
1610
perror_plus("setenv");
1438
return false;
1611
_exit(EX_OSERR);
1439
1612
}
1440
1613
free(delaystring);
1441
ret = execl(fullname, direntry->d_name, mode, NULL);
1442
perror_plus("execl");
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1443
1625
} else {
1444
1626
int status;
1445
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1469
1651
}
1470
1652
}
1471
1653
free(fullname);
1472
if(quit_now){
1473
break;
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1474
1657
}
1475
1658
}
1476
1659
close(devnull);
1477
1660
}
1478
return true;
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1479
1859
}
1480
1860
1481
1861
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1482
1866
AvahiSServiceBrowser *sb = NULL;
1483
int error;
1867
error_t ret_errno;
1484
1868
int ret;
1485
1869
intmax_t tmpmax;
1486
1870
char *tmp;
1487
1871
int exitcode = EXIT_SUCCESS;
1488
const char *interface = "";
1489
struct ifreq network;
1490
int sd = -1;
1491
bool take_down_interface = false;
1492
uid_t uid;
1493
gid_t gid;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1494
1874
char tempdir[] = "/tmp/mandosXXXXXX";
1495
1875
bool tempdir_created = false;
1496
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1497
1877
const char *seckey = PATHDIR "/" SECKEY;
1498
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1499
1880
1500
1881
bool gnutls_initialized = false;
1501
1882
bool gpgme_initialized = false;
1563
1944
.group = 2 },
1564
1945
{ .name = "retry", .key = 132,
1565
1946
.arg = "SECONDS",
1566
.doc = "Retry interval used when denied by the mandos server",
1947
.doc = "Retry interval used when denied by the Mandos server",
1567
1948
.group = 2 },
1568
1949
{ .name = "network-hook-dir", .key = 133,
1569
1950
.arg = "DIR",
1592
1973
connect_to = arg;
1593
1974
break;
1594
1975
case 'i': /* --interface */
1595
interface = arg;
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1596
1981
break;
1597
1982
case 's': /* --seckey */
1598
1983
seckey = arg;
1641
2026
argp_state_help(state, state->out_stream,
1642
2027
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1643
2028
case 'V': /* --version */
1644
fprintf_plus(state->out_stream,
1645
"Mandos plugin mandos-client: ");
1646
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1647
2030
exit(argp_err_exit_status);
1648
2031
break;
1673
2056
}
1674
2057
}
1675
2058
1676
if(getuid() == 0){
2059
{
1677
2060
/* Work around Debian bug #633582:
1678
2061
<http://bugs.debian.org/633582> */
1679
struct stat st;
1680
1681
/* Re-raise priviliges */
1682
errno = 0;
1683
ret = seteuid(0);
1684
if(ret == -1){
1685
perror_plus("seteuid");
1686
}
1687
1688
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1689
int seckey_fd = open(seckey, O_RDONLY);
1690
if(seckey_fd == -1){
1691
perror_plus("open");
1692
} else {
1693
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1694
if(ret == -1){
1695
perror_plus("fstat");
1696
} else {
1697
if(S_ISREG(st.st_mode)
1698
and st.st_uid == 0 and st.st_gid == 0){
1699
ret = fchown(seckey_fd, uid, gid);
1700
if(ret == -1){
1701
perror_plus("fchown");
1702
}
1703
}
1704
}
1705
TEMP_FAILURE_RETRY(close(seckey_fd));
1706
}
1707
}
1708
1709
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1710
int pubkey_fd = open(pubkey, O_RDONLY);
1711
if(pubkey_fd == -1){
1712
perror_plus("open");
1713
} else {
1714
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1715
if(ret == -1){
1716
perror_plus("fstat");
1717
} else {
1718
if(S_ISREG(st.st_mode)
1719
and st.st_uid == 0 and st.st_gid == 0){
1720
ret = fchown(pubkey_fd, uid, gid);
1721
if(ret == -1){
1722
perror_plus("fchown");
1723
}
1724
}
1725
}
1726
TEMP_FAILURE_RETRY(close(pubkey_fd));
1727
}
1728
}
1729
1730
/* Lower privileges */
1731
errno = 0;
1732
ret = seteuid(uid);
1733
if(ret == -1){
1734
perror_plus("seteuid");
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
1735
2136
}
1736
2137
}
1737
2138
1738
2139
/* Run network hooks */
1739
2140
{
1740
if(getuid() == 0){
1741
/* Re-raise priviliges */
1742
errno = 0;
1743
ret = seteuid(0);
1744
if(ret == -1){
1745
perror_plus("seteuid");
1746
}
1747
}
1748
if(not run_network_hooks("start", interface, delay)){
1749
goto end;
1750
}
1751
if(getuid() == 0){
1752
/* Lower privileges */
1753
errno = 0;
1754
ret = seteuid(uid);
1755
if(ret == -1){
1756
perror_plus("seteuid");
1757
}
1758
}
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1759
2152
}
1760
2153
1761
2154
if(not debug){
1762
2155
avahi_set_log_function(empty_log);
1763
2156
}
1764
2157
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1781
}
1782
if(interface == NULL){
1783
perror_plus("malloc");
1784
free(direntries);
1785
exitcode = EXIT_FAILURE;
1786
goto end;
1787
}
1788
free(direntries);
1789
} else {
1790
free(direntries);
1791
fprintf_plus(stderr, "Could not find a network interface\n");
1792
exitcode = EXIT_FAILURE;
1793
goto end;
1794
}
1795
}
1796
1797
2158
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1798
2159
from the signal handler */
1799
2160
/* Initialize the pseudo-RNG for Avahi */
1800
2161
srand((unsigned int) time(NULL));
1801
mc.simple_poll = avahi_simple_poll_new();
1802
if(mc.simple_poll == NULL){
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
1803
2164
fprintf_plus(stderr,
1804
2165
"Avahi: Failed to create simple poll object.\n");
1805
2166
exitcode = EX_UNAVAILABLE;
1869
2230
}
1870
2231
}
1871
2232
1872
/* If the interface is down, bring it up */
1873
if(strcmp(interface, "none") != 0){
1874
if_index = (AvahiIfIndex) if_nametoindex(interface);
1875
if(if_index == 0){
1876
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1877
exitcode = EX_UNAVAILABLE;
1878
goto end;
1879
}
1880
1881
if(quit_now){
1882
goto end;
1883
}
1884
1885
/* Re-raise priviliges */
1886
errno = 0;
1887
ret = seteuid(0);
1888
if(ret == -1){
1889
perror_plus("seteuid");
1890
}
1891
1892
#ifdef __linux__
1893
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1894
messages about the network interface to mess up the prompt */
1895
ret = klogctl(8, NULL, 5);
1896
bool restore_loglevel = true;
1897
if(ret == -1){
1898
restore_loglevel = false;
1899
perror_plus("klogctl");
1900
}
1901
#endif /* __linux__ */
1902
1903
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1904
if(sd < 0){
1905
perror_plus("socket");
1906
exitcode = EX_OSERR;
1907
#ifdef __linux__
1908
if(restore_loglevel){
1909
ret = klogctl(7, NULL, 0);
1910
if(ret == -1){
1911
perror_plus("klogctl");
1912
}
1913
}
1914
#endif /* __linux__ */
1915
/* Lower privileges */
1916
errno = 0;
1917
ret = seteuid(uid);
1918
if(ret == -1){
1919
perror_plus("seteuid");
1920
}
1921
goto end;
1922
}
1923
strcpy(network.ifr_name, interface);
1924
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1925
if(ret == -1){
1926
perror_plus("ioctl SIOCGIFFLAGS");
1927
#ifdef __linux__
1928
if(restore_loglevel){
1929
ret = klogctl(7, NULL, 0);
1930
if(ret == -1){
1931
perror_plus("klogctl");
1932
}
1933
}
1934
#endif /* __linux__ */
1935
exitcode = EX_OSERR;
1936
/* Lower privileges */
1937
errno = 0;
1938
ret = seteuid(uid);
1939
if(ret == -1){
1940
perror_plus("seteuid");
1941
}
1942
goto end;
1943
}
1944
if((network.ifr_flags & IFF_UP) == 0){
1945
network.ifr_flags |= IFF_UP;
1946
take_down_interface = true;
1947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1948
if(ret == -1){
1949
take_down_interface = false;
1950
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1951
exitcode = EX_OSERR;
1952
#ifdef __linux__
1953
if(restore_loglevel){
1954
ret = klogctl(7, NULL, 0);
1955
if(ret == -1){
1956
perror_plus("klogctl");
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
1957
2280
}
1958
2281
}
1959
#endif /* __linux__ */
1960
/* Lower privileges */
1961
errno = 0;
1962
ret = seteuid(uid);
1963
if(ret == -1){
1964
perror_plus("seteuid");
1965
}
1966
goto end;
1967
}
1968
}
1969
/* Sleep checking until interface is running.
1970
Check every 0.25s, up to total time of delay */
1971
for(int i=0; i < delay * 4; i++){
1972
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1973
if(ret == -1){
1974
perror_plus("ioctl SIOCGIFFLAGS");
1975
} else if(network.ifr_flags & IFF_RUNNING){
1976
2282
break;
1977
2283
}
1978
struct timespec sleeptime = { .tv_nsec = 250000000 };
1979
ret = nanosleep(&sleeptime, NULL);
1980
if(ret == -1 and errno != EINTR){
1981
perror_plus("nanosleep");
1982
}
1983
}
1984
if(not take_down_interface){
1985
/* We won't need the socket anymore */
1986
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1987
if(ret == -1){
1988
perror_plus("close");
1989
}
1990
}
1991
#ifdef __linux__
1992
if(restore_loglevel){
1993
/* Restores kernel loglevel to default */
1994
ret = klogctl(7, NULL, 0);
1995
if(ret == -1){
1996
perror_plus("klogctl");
1997
}
1998
}
1999
#endif /* __linux__ */
2000
/* Lower privileges */
2001
errno = 0;
2002
/* Lower privileges */
2003
ret = seteuid(uid);
2004
if(ret == -1){
2005
perror_plus("seteuid");
2006
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2007
2311
}
2008
2312
2009
2313
if(quit_now){
2010
2314
goto end;
2011
2315
}
2012
2316
2013
ret = init_gnutls_global(pubkey, seckey);
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2014
2318
if(ret == -1){
2015
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2016
2320
exitcode = EX_UNAVAILABLE;
2033
2337
goto end;
2034
2338
}
2035
2339
2036
if(not init_gpgme(pubkey, seckey, tempdir)){
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2037
2341
fprintf_plus(stderr, "init_gpgme failed\n");
2038
2342
exitcode = EX_UNAVAILABLE;
2039
2343
goto end;
2049
2353
/* Connect directly, do not use Zeroconf */
2050
2354
/* (Mainly meant for debugging) */
2051
2355
char *address = strrchr(connect_to, ':');
2356
2052
2357
if(address == NULL){
2053
2358
fprintf_plus(stderr, "No colon in address\n");
2054
2359
exitcode = EX_USAGE;
2059
2364
goto end;
2060
2365
}
2061
2366
2062
uint16_t port;
2367
in_port_t port;
2063
2368
errno = 0;
2064
2369
tmpmax = strtoimax(address+1, &tmp, 10);
2065
2370
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2066
or tmpmax != (uint16_t)tmpmax){
2371
or tmpmax != (in_port_t)tmpmax){
2067
2372
fprintf_plus(stderr, "Bad port number\n");
2068
2373
exitcode = EX_USAGE;
2069
2374
goto end;
2070
2375
}
2071
2376
2072
2377
if(quit_now){
2073
2378
goto end;
2074
2379
}
2075
2380
2076
port = (uint16_t)tmpmax;
2381
port = (in_port_t)tmpmax;
2077
2382
*address = '\0';
2078
2383
/* Colon in address indicates IPv6 */
2079
2384
int af;
2095
2400
}
2096
2401
2097
2402
while(not quit_now){
2098
ret = start_mandos_communication(address, port, if_index, af);
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2099
2405
if(quit_now or ret == 0){
2100
2406
break;
2101
2407
}
2103
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2104
2410
(int)retry_interval);
2105
2411
}
2106
sleep((int)retry_interval);
2412
sleep((unsigned int)retry_interval);
2107
2413
}
2108
2414
2109
if (not quit_now){
2415
if(not quit_now){
2110
2416
exitcode = EXIT_SUCCESS;
2111
2417
}
2112
2418
2127
2433
config.publish_domain = 0;
2128
2434
2129
2435
/* Allocate a new server */
2130
mc.server = avahi_server_new(avahi_simple_poll_get
2131
(mc.simple_poll), &config, NULL,
2132
NULL, &error);
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
2133
2438
2134
2439
/* Free the Avahi configuration data */
2135
2440
avahi_server_config_free(&config);
2138
2443
/* Check if creating the Avahi server object succeeded */
2139
2444
if(mc.server == NULL){
2140
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2141
avahi_strerror(error));
2446
avahi_strerror(ret_errno));
2142
2447
exitcode = EX_UNAVAILABLE;
2143
2448
goto end;
2144
2449
}
2150
2455
/* Create the Avahi service browser */
2151
2456
sb = avahi_s_service_browser_new(mc.server, if_index,
2152
2457
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2153
NULL, 0, browse_callback, NULL);
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
2154
2460
if(sb == NULL){
2155
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2156
2462
avahi_strerror(avahi_server_errno(mc.server)));
2168
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2169
2475
}
2170
2476
2171
ret = avahi_loop_with_timeout(mc.simple_poll,
2172
(int)(retry_interval * 1000));
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2173
2479
if(debug){
2174
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2175
2481
(ret == 0) ? "successfully" : "with error");
2182
2488
}
2183
2489
2184
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
2185
2493
if(sb != NULL)
2186
2494
avahi_s_service_browser_free(sb);
2187
2495
2188
2496
if(mc.server != NULL)
2189
2497
avahi_server_free(mc.server);
2190
2498
2191
if(mc.simple_poll != NULL)
2192
avahi_simple_poll_free(mc.simple_poll);
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
2193
2501
2194
2502
if(gnutls_initialized){
2195
2503
gnutls_certificate_free_credentials(mc.cred);
2200
2508
if(gpgme_initialized){
2201
2509
gpgme_release(mc.ctx);
2202
2510
}
2203
2511
2204
2512
/* Cleans up the circular linked list of Mandos servers the client
2205
2513
has seen */
2206
2514
if(mc.current_server != NULL){
2212
2520
}
2213
2521
}
2214
2522
2215
/* Re-raise priviliges */
2523
/* Re-raise privileges */
2216
2524
{
2217
if(getuid() == 0){
2218
errno = 0;
2219
ret = seteuid(0);
2220
if(ret == -1){
2221
perror_plus("seteuid");
2222
}
2223
}
2224
/* Run network hooks */
2225
if(not run_network_hooks("stop", interface, delay)){
2226
goto end;
2227
}
2228
2229
/* Take down the network interface */
2230
if(take_down_interface and geteuid() == 0){
2231
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2232
if(ret == -1){
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2237
if(ret == -1){
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2239
}
2240
}
2241
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2242
if(ret == -1){
2243
perror_plus("close");
2244
}
2245
}
2246
}
2247
if(getuid() == 0){
2248
/* Lower privileges permanently */
2249
errno = 0;
2250
ret = setuid(uid);
2251
if(ret == -1){
2252
perror_plus("setuid");
2253
}
2254
}
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2255
2560
2256
2561
/* Removes the GPGME temp directory and all files inside */
2257
2562
if(tempdir_created){
2259
2564
struct dirent *direntry = NULL;
2260
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2261
2566
alphasort);
2262
if (numentries > 0){
2567
if(numentries > 0){
2263
2568
for(int i = 0; i < numentries; i++){
2264
2569
direntry = direntries[i];
2265
2570
char *fullname = NULL;
2280
2585
2281
2586
/* need to clean even if 0 because man page doesn't specify */
2282
2587
free(direntries);
2283
if (numentries == -1){
2588
if(numentries == -1){
2284
2589
perror_plus("scandir");
2285
2590
}
2286
2591
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0