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237.16.10
(compared to revision 237.7.224)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (237.15.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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() */
58
inet_pton(), connect() */
60
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
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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() */
97
90
98
91
#ifdef __linux__
99
92
#include <sys/klog.h> /* klogctl() */
136
129
137
130
bool debug = false;
138
131
static const char mandos_protocol_version[] = "1";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
134
static const char sys_class_net[] = "/sys/class/net";
142
135
char *connect_to = NULL;
143
136
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
137
147
138
/* Doubly linked list that need to be circularly linked when used */
148
139
typedef struct server{
149
140
const char *ip;
150
in_port_t port;
141
uint16_t port;
151
142
AvahiIfIndex if_index;
152
143
int af;
153
144
struct timespec last_seen;
157
148
158
149
/* Used for passing in values through the Avahi callback functions */
159
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
160
152
AvahiServer *server;
161
153
gnutls_certificate_credentials_t cred;
162
154
unsigned int dh_bits;
164
156
const char *priority;
165
157
gpgme_ctx_t ctx;
166
158
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
159
} mandos_context;
170
160
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
166
174
167
sig_atomic_t quit_now = 0;
175
168
int signal_received = 0;
176
169
177
170
/* Function to use when printing errors */
178
171
void perror_plus(const char *print_text){
179
int e = errno;
180
172
fprintf(stderr, "Mandos plugin %s: ",
181
173
program_invocation_short_name);
182
errno = e;
183
174
perror(print_text);
184
175
}
185
176
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
177
int fprintf_plus(FILE *stream, const char *format, ...){
188
178
va_list ap;
189
179
va_start (ap, format);
190
180
191
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
182
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
184
}
195
185
196
186
/*
198
188
* bytes. "buffer_capacity" is how much is currently allocated,
199
189
* "buffer_length" is how much is already used.
200
190
*/
201
__attribute__((nonnull, warn_unused_result))
202
191
size_t incbuffer(char **buffer, size_t buffer_length,
203
192
size_t buffer_capacity){
204
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
211
196
return 0;
212
197
}
213
*buffer = new_buf;
214
198
buffer_capacity += BUFFER_SIZE;
215
199
}
216
200
return buffer_capacity;
217
201
}
218
202
219
203
/* Add server to set of servers to retry periodically */
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){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
223
206
int ret;
224
207
server *new_server = malloc(sizeof(server));
225
208
if(new_server == NULL){
226
209
perror_plus("malloc");
227
return false;
210
return -1;
228
211
}
229
212
*new_server = (server){ .ip = strdup(ip),
230
213
.port = port,
232
215
.af = af };
233
216
if(new_server->ip == NULL){
234
217
perror_plus("strdup");
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;
218
return -1;
241
219
}
242
220
/* Special case of first server */
243
if(*current_server == NULL){
221
if (mc.current_server == NULL){
244
222
new_server->next = new_server;
245
223
new_server->prev = new_server;
246
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
247
226
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
251
229
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
255
238
}
256
239
257
240
/*
258
241
* Initialize GPGME.
259
242
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
265
245
gpgme_error_t rc;
266
246
gpgme_engine_info_t engine_info;
267
247
248
268
249
/*
269
250
* Helper function to insert pub and seckey to the engine keyring.
270
251
*/
271
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
272
253
int ret;
273
254
int fd;
274
255
gpgme_data_t pgp_data;
286
267
return false;
287
268
}
288
269
289
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
290
271
if(rc != GPG_ERR_NO_ERROR){
291
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
273
gpgme_strsource(rc), gpgme_strerror(rc));
336
317
}
337
318
338
319
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
340
321
if(rc != GPG_ERR_NO_ERROR){
341
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
336
* Decrypt OpenPGP data.
356
337
* Returns -1 on error
357
338
*/
358
__attribute__((nonnull, warn_unused_result))
359
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
340
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
341
char **plaintext){
363
342
gpgme_data_t dh_crypto, dh_plain;
364
343
gpgme_error_t rc;
365
344
ssize_t ret;
391
370
392
371
/* Decrypt data from the cryptotext data buffer to the plaintext
393
372
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
374
if(rc != GPG_ERR_NO_ERROR){
396
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
376
gpgme_strsource(rc), gpgme_strerror(rc));
398
377
plaintext_length = -1;
399
378
if(debug){
400
379
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
402
381
if(result == NULL){
403
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
383
} else {
481
460
return plaintext_length;
482
461
}
483
462
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
487
466
if(ret == NULL)
488
467
ret = "(unknown)";
489
468
return ret;
490
469
}
491
470
492
471
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
472
static void debuggnutls(__attribute__((unused)) int level,
495
473
const char* string){
496
474
fprintf_plus(stderr, "GnuTLS: %s", string);
497
475
}
498
476
499
__attribute__((nonnull, warn_unused_result))
500
477
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
478
const char *seckeyfilename){
503
479
int ret;
504
480
505
481
if(debug){
522
498
}
523
499
524
500
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
502
if(ret != GNUTLS_E_SUCCESS){
527
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
504
safer_gnutls_strerror(ret));
538
514
}
539
515
540
516
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
542
518
GNUTLS_OPENPGP_FMT_BASE64);
543
519
if(ret != GNUTLS_E_SUCCESS){
544
520
fprintf_plus(stderr,
550
526
}
551
527
552
528
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
554
530
if(ret != GNUTLS_E_SUCCESS){
555
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
532
" initialization: %s\n",
557
533
safer_gnutls_strerror(ret));
558
534
goto globalfail;
559
535
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
537
if(ret != GNUTLS_E_SUCCESS){
562
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
539
safer_gnutls_strerror(ret));
564
540
goto globalfail;
565
541
}
566
542
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
544
569
545
return 0;
570
546
571
547
globalfail:
572
548
573
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
574
550
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
576
552
return -1;
577
553
}
578
554
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
582
556
int ret;
583
557
/* GnuTLS session creation */
584
558
do {
596
570
{
597
571
const char *err;
598
572
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
574
if(quit_now){
601
575
gnutls_deinit(*session);
602
576
return -1;
613
587
614
588
do {
615
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
590
mc.cred);
617
591
if(quit_now){
618
592
gnutls_deinit(*session);
619
593
return -1;
629
603
/* ignore client certificate if any. */
630
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
605
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
607
634
608
return 0;
635
609
}
639
613
__attribute__((unused)) const char *txt){}
640
614
641
615
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
644
617
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
618
int af){
646
619
int ret, tcp_sd = -1;
647
620
ssize_t sret;
648
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
649
625
char *buffer = NULL;
650
626
char *decrypted_buffer = NULL;
651
627
size_t buffer_length = 0;
675
651
return -1;
676
652
}
677
653
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
711
655
if(ret != 0){
712
656
return -1;
713
657
}
714
658
715
659
if(debug){
716
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
718
662
}
719
663
720
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
676
733
677
memset(&to, 0, sizeof(to));
734
678
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
681
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
740
684
}
741
685
if(ret < 0 ){
742
686
int e = errno;
751
695
goto mandos_end;
752
696
}
753
697
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
757
705
if(if_index == AVAHI_IF_UNSPEC){
758
706
fprintf_plus(stderr, "An IPv6 link-local address is"
759
707
" incomplete without a network interface\n");
761
709
goto mandos_end;
762
710
}
763
711
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
765
713
}
766
714
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
768
718
}
769
719
770
720
if(quit_now){
778
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
729
perror_plus("if_indextoname");
780
730
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
783
733
}
784
734
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
787
737
}
788
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
790
741
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
795
744
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
800
747
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
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
}
807
754
}
808
755
}
809
756
813
760
}
814
761
815
762
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
764
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
766
}
822
767
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
769
int e = errno;
825
770
perror_plus("connect");
826
771
errno = e;
872
817
goto mandos_end;
873
818
}
874
819
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
822
881
823
if(quit_now){
882
824
errno = EINTR;
987
929
if(buffer_length > 0){
988
930
ssize_t decrypted_buffer_size;
989
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
932
&decrypted_buffer);
991
933
if(decrypted_buffer_size >= 0){
992
934
993
935
written = 0;
1041
983
return retval;
1042
984
}
1043
985
1044
__attribute__((nonnull))
1045
986
static void resolve_callback(AvahiSServiceResolver *r,
1046
987
AvahiIfIndex interface,
1047
988
AvahiProtocol proto,
1055
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
998
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1062
1001
1063
1002
/* Called whenever a service has been resolved successfully or
1064
1003
timed out */
1073
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
1014
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1078
1016
break;
1079
1017
1080
1018
case AVAHI_RESOLVER_FOUND:
1086
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
1025
host_name, ip, (intmax_t)interface, port);
1088
1026
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1093
1029
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1095
1031
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1102
1034
}
1103
1035
}
1104
1036
}
1114
1046
const char *domain,
1115
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1048
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1121
1051
1122
1052
/* Called whenever a new services becomes available on the LAN or
1123
1053
is removed from the LAN */
1131
1061
case AVAHI_BROWSER_FAILURE:
1132
1062
1133
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1137
1066
return;
1138
1067
1139
1068
case AVAHI_BROWSER_NEW:
1142
1071
the callback function is called the Avahi server will free the
1143
1072
resolver for us. */
1144
1073
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1149
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
1078
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1153
1080
break;
1154
1081
1155
1082
case AVAHI_BROWSER_REMOVE:
1174
1101
signal_received = sig;
1175
1102
int old_errno = errno;
1176
1103
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1179
1106
}
1180
1107
errno = old_errno;
1181
1108
}
1182
1109
1183
__attribute__((nonnull, warn_unused_result))
1184
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1111
int ret;
1186
error_t ret_errno;
1187
1112
1188
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1114
if(s < 0){
1190
ret_errno = errno;
1191
1115
perror_plus("socket");
1192
errno = ret_errno;
1193
1116
return false;
1194
1117
}
1195
1118
strcpy(ifr->ifr_name, ifname);
1196
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1120
if(ret == -1){
1198
1121
if(debug){
1199
ret_errno = errno;
1200
1122
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1123
}
1203
1124
return false;
1204
1125
}
1205
1126
return true;
1206
1127
}
1207
1128
1208
__attribute__((nonnull, warn_unused_result))
1209
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1130
1211
1131
/* Reject the loopback device */
1253
1173
* corresponds to an acceptable network device.
1254
1174
* (This function is passed to scandir(3) as a filter function.)
1255
1175
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1176
int good_interface(const struct dirent *if_entry){
1258
1177
if(if_entry->d_name[0] == '.'){
1259
1178
return 0;
1275
1194
}
1276
1195
1277
1196
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1312
1239
int notdotentries(const struct dirent *direntry){
1313
1240
/* Skip "." and ".." */
1314
1241
if(direntry->d_name[0] == '.'
1321
1248
}
1322
1249
1323
1250
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1251
int runnable_hook(const struct dirent *direntry){
1326
1252
int ret;
1327
1253
size_t sret;
1375
1301
}
1376
1302
return 0;
1377
1303
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1382
1304
return 1;
1383
1305
}
1384
1306
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1388
1308
int ret;
1389
1309
struct timespec now;
1390
1310
struct timespec waited_time;
1391
1311
intmax_t block_time;
1392
1312
1393
1313
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1314
if(mc.current_server == NULL){
1315
if (debug){
1396
1316
fprintf_plus(stderr, "Wait until first server is found."
1397
1317
" No timeout!\n");
1398
1318
}
1399
1319
ret = avahi_simple_poll_iterate(s, -1);
1400
1320
} else {
1401
if(debug){
1321
if (debug){
1402
1322
fprintf_plus(stderr, "Check current_server if we should run"
1403
1323
" it, or wait\n");
1404
1324
}
1411
1331
/* Calculating in ms how long time between now and server
1412
1332
who we visted longest time ago. Now - last seen. */
1413
1333
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1415
1335
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1417
1337
/* total time is 10s/10,000ms.
1418
1338
Converting to s from ms by dividing by 1,000,
1419
1339
and ns to ms by dividing by 1,000,000. */
1421
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1422
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1343
1424
if(debug){
1344
if (debug){
1425
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
1346
block_time);
1427
1347
}
1428
1348
1429
1349
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1434
1354
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1436
1356
return 0;
1437
1357
}
1438
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1440
1360
if(ret == -1){
1441
1361
perror_plus("clock_gettime");
1442
1362
return -1;
1443
1363
}
1444
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1445
1365
block_time = 0; /* Call avahi to find new Mandos
1446
1366
servers, but don't block */
1447
1367
}
1449
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
1370
}
1451
1371
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1372
if (ret > 0 or errno != EINTR){
1453
1373
return (ret != 1) ? ret : 0;
1454
1374
}
1455
1375
}
1456
1376
}
1457
1377
}
1458
1378
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1379
bool run_network_hooks(const char *mode, const char *interface,
1517
1380
const float delay){
1518
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1519
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
1385
alphasort);
1521
1386
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1387
perror_plus("scandir");
1530
1388
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
1389
int devnull = open("/dev/null", O_RDONLY);
1534
1390
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1391
direntry = direntries[0];
1536
1392
char *fullname = NULL;
1537
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
1394
if(ret < 0){
1539
1395
perror_plus("asprintf");
1540
1396
continue;
1541
1397
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
1398
pid_t hook_pid = fork();
1547
1399
if(hook_pid == 0){
1548
1400
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
1405
if(ret == -1){
1585
1406
perror_plus("setenv");
1586
_exit(EX_OSERR);
1407
return false;
1587
1408
}
1588
1409
ret = setenv("DEVICE", interface, 1);
1589
1410
if(ret == -1){
1590
1411
perror_plus("setenv");
1591
_exit(EX_OSERR);
1412
return false;
1592
1413
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1594
1415
if(ret == -1){
1595
1416
perror_plus("setenv");
1596
_exit(EX_OSERR);
1417
return false;
1597
1418
}
1598
1419
ret = setenv("MODE", mode, 1);
1599
1420
if(ret == -1){
1600
1421
perror_plus("setenv");
1601
_exit(EX_OSERR);
1422
return false;
1602
1423
}
1603
1424
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1425
ret = asprintf(&delaystring, "%f", delay);
1605
1426
if(ret == -1){
1606
1427
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1428
return false;
1608
1429
}
1609
1430
ret = setenv("DELAY", delaystring, 1);
1610
1431
if(ret == -1){
1611
1432
free(delaystring);
1612
1433
perror_plus("setenv");
1613
_exit(EX_OSERR);
1434
return false;
1614
1435
}
1615
1436
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1627
1439
} else {
1628
1440
int status;
1629
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1653
1465
}
1654
1466
}
1655
1467
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1468
if(quit_now){
1469
break;
1659
1470
}
1660
1471
}
1661
1472
close(devnull);
1662
1473
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
1474
return true;
1861
1475
}
1862
1476
1863
1477
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1868
1478
AvahiSServiceBrowser *sb = NULL;
1869
error_t ret_errno;
1479
int error;
1870
1480
int ret;
1871
1481
intmax_t tmpmax;
1872
1482
char *tmp;
1873
1483
int exitcode = EXIT_SUCCESS;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
1879
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1880
1493
const char *seckey = PATHDIR "/" SECKEY;
1881
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1883
1495
1884
1496
bool gnutls_initialized = false;
1885
1497
bool gpgme_initialized = false;
1947
1559
.group = 2 },
1948
1560
{ .name = "retry", .key = 132,
1949
1561
.arg = "SECONDS",
1950
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1951
1563
.group = 2 },
1952
1564
{ .name = "network-hook-dir", .key = 133,
1953
1565
.arg = "DIR",
1976
1588
connect_to = arg;
1977
1589
break;
1978
1590
case 'i': /* --interface */
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1591
interface = arg;
1984
1592
break;
1985
1593
case 's': /* --seckey */
1986
1594
seckey = arg;
2029
1637
argp_state_help(state, state->out_stream,
2030
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2031
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
2032
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2033
1643
exit(argp_err_exit_status);
2034
1644
break;
2062
1672
{
2063
1673
/* Work around Debian bug #633582:
2064
1674
<http://bugs.debian.org/633582> */
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
2071
} else {
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2139
1731
}
2140
1732
}
2141
1733
2142
1734
/* Run network hooks */
2143
1735
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2155
1751
}
2156
1752
2157
1753
if(not debug){
2158
1754
avahi_set_log_function(empty_log);
2159
1755
}
2160
1756
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
2161
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2162
1790
from the signal handler */
2163
1791
/* Initialize the pseudo-RNG for Avahi */
2164
1792
srand((unsigned int) time(NULL));
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2167
1795
fprintf_plus(stderr,
2168
1796
"Avahi: Failed to create simple poll object.\n");
2169
1797
exitcode = EX_UNAVAILABLE;
2233
1861
}
2234
1862
}
2235
1863
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2283
1949
}
2284
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2285
1968
break;
2286
1969
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2314
1999
}
2315
2000
2316
2001
if(quit_now){
2317
2002
goto end;
2318
2003
}
2319
2004
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2321
2006
if(ret == -1){
2322
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2323
2008
exitcode = EX_UNAVAILABLE;
2330
2015
goto end;
2331
2016
}
2332
2017
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
2018
if(mkdtemp(tempdir) == NULL){
2343
2019
perror_plus("mkdtemp");
2344
2020
goto end;
2345
2021
}
2022
tempdir_created = true;
2346
2023
2347
2024
if(quit_now){
2348
2025
goto end;
2349
2026
}
2350
2027
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2352
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2353
2030
exitcode = EX_UNAVAILABLE;
2354
2031
goto end;
2364
2041
/* Connect directly, do not use Zeroconf */
2365
2042
/* (Mainly meant for debugging) */
2366
2043
char *address = strrchr(connect_to, ':');
2367
2368
2044
if(address == NULL){
2369
2045
fprintf_plus(stderr, "No colon in address\n");
2370
2046
exitcode = EX_USAGE;
2375
2051
goto end;
2376
2052
}
2377
2053
2378
in_port_t port;
2054
uint16_t port;
2379
2055
errno = 0;
2380
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2381
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2382
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2383
2059
fprintf_plus(stderr, "Bad port number\n");
2384
2060
exitcode = EX_USAGE;
2385
2061
goto end;
2386
2062
}
2387
2063
2388
2064
if(quit_now){
2389
2065
goto end;
2390
2066
}
2391
2067
2392
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2393
2069
*address = '\0';
2394
2070
/* Colon in address indicates IPv6 */
2395
2071
int af;
2411
2087
}
2412
2088
2413
2089
while(not quit_now){
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2416
2091
if(quit_now or ret == 0){
2417
2092
break;
2418
2093
}
2420
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
2096
(int)retry_interval);
2422
2097
}
2423
sleep((unsigned int)retry_interval);
2098
sleep((int)retry_interval);
2424
2099
}
2425
2100
2426
if(not quit_now){
2101
if (not quit_now){
2427
2102
exitcode = EXIT_SUCCESS;
2428
2103
}
2429
2104
2444
2119
config.publish_domain = 0;
2445
2120
2446
2121
/* Allocate a new server */
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2449
2125
2450
2126
/* Free the Avahi configuration data */
2451
2127
avahi_server_config_free(&config);
2454
2130
/* Check if creating the Avahi server object succeeded */
2455
2131
if(mc.server == NULL){
2456
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2458
2134
exitcode = EX_UNAVAILABLE;
2459
2135
goto end;
2460
2136
}
2466
2142
/* Create the Avahi service browser */
2467
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2468
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2471
2146
if(sb == NULL){
2472
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2473
2148
avahi_strerror(avahi_server_errno(mc.server)));
2485
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2486
2161
}
2487
2162
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2490
2165
if(debug){
2491
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2492
2167
(ret == 0) ? "successfully" : "with error");
2499
2174
}
2500
2175
2501
2176
/* Cleanup things */
2502
free(mc.interfaces);
2503
2504
2177
if(sb != NULL)
2505
2178
avahi_s_service_browser_free(sb);
2506
2179
2507
2180
if(mc.server != NULL)
2508
2181
avahi_server_free(mc.server);
2509
2182
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2512
2185
2513
2186
if(gnutls_initialized){
2514
2187
gnutls_certificate_free_credentials(mc.cred);
2519
2192
if(gpgme_initialized){
2520
2193
gpgme_release(mc.ctx);
2521
2194
}
2522
2195
2523
2196
/* Cleans up the circular linked list of Mandos servers the client
2524
2197
has seen */
2525
2198
if(mc.current_server != NULL){
2531
2204
}
2532
2205
}
2533
2206
2534
/* Re-raise privileges */
2207
/* Re-raise priviliges */
2535
2208
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2562
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2566
}
2567
}
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2218
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
2235
}
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2571
2243
2572
2244
/* Removes the GPGME temp directory and all files inside */
2573
if(tempdir != NULL){
2245
if(tempdir_created){
2574
2246
struct dirent **direntries = NULL;
2575
2247
struct dirent *direntry = NULL;
2576
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2577
2249
alphasort);
2578
if(numentries > 0){
2250
if (numentries > 0){
2579
2251
for(int i = 0; i < numentries; i++){
2580
2252
direntry = direntries[i];
2581
2253
char *fullname = NULL;
2596
2268
2597
2269
/* need to clean even if 0 because man page doesn't specify */
2598
2270
free(direntries);
2599
if(numentries == -1){
2271
if (numentries == -1){
2600
2272
perror_plus("scandir");
2601
2273
}
2602
2274
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0