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- Committer: Teddy Hogeborn
- Date: 2014-06-06 02:29:14 UTC
- Revision ID: teddy@recompile.se-20140606022914-qc2q0bg0rtus8s2g
Tags: version-1.6.5-3
* debian/changelog (1.6.5-3): New entry.
- files added:
- debian/mandos-client.examples
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
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){
245
265
gpgme_error_t rc;
246
266
gpgme_engine_info_t engine_info;
247
267
248
249
268
/*
250
269
* Helper function to insert pub and seckey to the engine keyring.
251
270
*/
252
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
253
272
int ret;
254
273
int fd;
255
274
gpgme_data_t pgp_data;
267
286
return false;
268
287
}
269
288
270
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
271
290
if(rc != GPG_ERR_NO_ERROR){
272
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
292
gpgme_strsource(rc), gpgme_strerror(rc));
317
336
}
318
337
319
338
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
321
340
if(rc != GPG_ERR_NO_ERROR){
322
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
336
355
* Decrypt OpenPGP data.
337
356
* Returns -1 on error
338
357
*/
358
__attribute__((nonnull, warn_unused_result))
339
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
360
size_t crypto_size,
341
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
342
363
gpgme_data_t dh_crypto, dh_plain;
343
364
gpgme_error_t rc;
344
365
ssize_t ret;
370
391
371
392
/* Decrypt data from the cryptotext data buffer to the plaintext
372
393
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
395
if(rc != GPG_ERR_NO_ERROR){
375
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
397
gpgme_strsource(rc), gpgme_strerror(rc));
377
398
plaintext_length = -1;
378
399
if(debug){
379
400
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
381
402
if(result == NULL){
382
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
404
} else {
460
481
return plaintext_length;
461
482
}
462
483
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
466
487
if(ret == NULL)
467
488
ret = "(unknown)";
468
489
return ret;
469
490
}
470
491
471
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
472
494
static void debuggnutls(__attribute__((unused)) int level,
473
495
const char* string){
474
496
fprintf_plus(stderr, "GnuTLS: %s", string);
475
497
}
476
498
499
__attribute__((nonnull, warn_unused_result))
477
500
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
479
503
int ret;
480
504
481
505
if(debug){
498
522
}
499
523
500
524
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
526
if(ret != GNUTLS_E_SUCCESS){
503
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
528
safer_gnutls_strerror(ret));
514
538
}
515
539
516
540
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
518
542
GNUTLS_OPENPGP_FMT_BASE64);
519
543
if(ret != GNUTLS_E_SUCCESS){
520
544
fprintf_plus(stderr,
526
550
}
527
551
528
552
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
530
554
if(ret != GNUTLS_E_SUCCESS){
531
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
556
" initialization: %s\n",
533
557
safer_gnutls_strerror(ret));
534
558
goto globalfail;
535
559
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
561
if(ret != GNUTLS_E_SUCCESS){
538
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
563
safer_gnutls_strerror(ret));
540
564
goto globalfail;
541
565
}
542
566
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
568
545
569
return 0;
546
570
547
571
globalfail:
548
572
549
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
550
574
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
552
576
return -1;
553
577
}
554
578
555
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
556
582
int ret;
557
583
/* GnuTLS session creation */
558
584
do {
570
596
{
571
597
const char *err;
572
598
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
600
if(quit_now){
575
601
gnutls_deinit(*session);
576
602
return -1;
587
613
588
614
do {
589
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
616
mc->cred);
591
617
if(quit_now){
592
618
gnutls_deinit(*session);
593
619
return -1;
603
629
/* ignore client certificate if any. */
604
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
631
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
633
608
634
return 0;
609
635
}
613
639
__attribute__((unused)) const char *txt){}
614
640
615
641
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
617
644
AvahiIfIndex if_index,
618
int af){
645
int af, mandos_context *mc){
619
646
int ret, tcp_sd = -1;
620
647
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
648
struct sockaddr_storage to;
625
649
char *buffer = NULL;
626
650
char *decrypted_buffer = NULL;
627
651
size_t buffer_length = 0;
651
675
return -1;
652
676
}
653
677
654
ret = init_gnutls_session(&session);
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);
655
711
if(ret != 0){
656
712
return -1;
657
713
}
658
714
659
715
if(debug){
660
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
717
PRIuMAX "\n", ip, (uintmax_t)port);
662
718
}
663
719
664
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
676
732
677
733
memset(&to, 0, sizeof(to));
678
734
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
681
737
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
684
740
}
685
741
if(ret < 0 ){
686
742
int e = errno;
695
751
goto mandos_end;
696
752
}
697
753
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*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
757
if(if_index == AVAHI_IF_UNSPEC){
706
758
fprintf_plus(stderr, "An IPv6 link-local address is"
707
759
" incomplete without a network interface\n");
709
761
goto mandos_end;
710
762
}
711
763
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
765
}
714
766
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
768
}
719
769
720
770
if(quit_now){
728
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
779
perror_plus("if_indextoname");
730
780
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
733
783
}
734
784
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
737
787
}
738
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
790
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
744
795
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
747
800
}
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
}
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);
754
807
}
755
808
}
756
809
760
813
}
761
814
762
815
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
764
818
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
766
821
}
767
822
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
824
int e = errno;
770
825
perror_plus("connect");
771
826
errno = e;
817
872
goto mandos_end;
818
873
}
819
874
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
822
880
823
881
if(quit_now){
824
882
errno = EINTR;
929
987
if(buffer_length > 0){
930
988
ssize_t decrypted_buffer_size;
931
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
990
&decrypted_buffer, mc);
933
991
if(decrypted_buffer_size >= 0){
934
992
935
993
written = 0;
983
1041
return retval;
984
1042
}
985
1043
1044
__attribute__((nonnull))
986
1045
static void resolve_callback(AvahiSServiceResolver *r,
987
1046
AvahiIfIndex interface,
988
1047
AvahiProtocol proto,
996
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1057
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1001
1062
1002
1063
/* Called whenever a service has been resolved successfully or
1003
1064
timed out */
1012
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1075
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1016
1078
break;
1017
1079
1018
1080
case AVAHI_RESOLVER_FOUND:
1024
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1087
host_name, ip, (intmax_t)interface, port);
1026
1088
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1029
1093
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1031
1095
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
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
}
1034
1102
}
1035
1103
}
1036
1104
}
1046
1114
const char *domain,
1047
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1116
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1051
1121
1052
1122
/* Called whenever a new services becomes available on the LAN or
1053
1123
is removed from the LAN */
1061
1131
case AVAHI_BROWSER_FAILURE:
1062
1132
1063
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1066
1137
return;
1067
1138
1068
1139
case AVAHI_BROWSER_NEW:
1071
1142
the callback function is called the Avahi server will free the
1072
1143
resolver for us. */
1073
1144
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
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)
1077
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1150
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1080
1153
break;
1081
1154
1082
1155
case AVAHI_BROWSER_REMOVE:
1101
1174
signal_received = sig;
1102
1175
int old_errno = errno;
1103
1176
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1106
1179
}
1107
1180
errno = old_errno;
1108
1181
}
1109
1182
1183
__attribute__((nonnull, warn_unused_result))
1110
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1185
int ret;
1186
error_t ret_errno;
1112
1187
1113
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1189
if(s < 0){
1190
ret_errno = errno;
1115
1191
perror_plus("socket");
1192
errno = ret_errno;
1116
1193
return false;
1117
1194
}
1118
1195
strcpy(ifr->ifr_name, ifname);
1119
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1197
if(ret == -1){
1121
1198
if(debug){
1199
ret_errno = errno;
1122
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1123
1202
}
1124
1203
return false;
1125
1204
}
1126
1205
return true;
1127
1206
}
1128
1207
1208
__attribute__((nonnull, warn_unused_result))
1129
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1210
1131
1211
/* Reject the loopback device */
1173
1253
* corresponds to an acceptable network device.
1174
1254
* (This function is passed to scandir(3) as a filter function.)
1175
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1176
1257
int good_interface(const struct dirent *if_entry){
1177
1258
if(if_entry->d_name[0] == '.'){
1178
1259
return 0;
1194
1275
}
1195
1276
1196
1277
/*
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
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))
1239
1312
int notdotentries(const struct dirent *direntry){
1240
1313
/* Skip "." and ".." */
1241
1314
if(direntry->d_name[0] == '.'
1248
1321
}
1249
1322
1250
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1251
1325
int runnable_hook(const struct dirent *direntry){
1252
1326
int ret;
1253
1327
size_t sret;
1308
1382
return 1;
1309
1383
}
1310
1384
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1312
1388
int ret;
1313
1389
struct timespec now;
1314
1390
struct timespec waited_time;
1315
1391
intmax_t block_time;
1316
1392
1317
1393
while(true){
1318
if(mc.current_server == NULL){
1319
if (debug){
1394
if(mc->current_server == NULL){
1395
if(debug){
1320
1396
fprintf_plus(stderr, "Wait until first server is found."
1321
1397
" No timeout!\n");
1322
1398
}
1323
1399
ret = avahi_simple_poll_iterate(s, -1);
1324
1400
} else {
1325
if (debug){
1401
if(debug){
1326
1402
fprintf_plus(stderr, "Check current_server if we should run"
1327
1403
" it, or wait\n");
1328
1404
}
1335
1411
/* Calculating in ms how long time between now and server
1336
1412
who we visted longest time ago. Now - last seen. */
1337
1413
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1339
1415
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1341
1417
/* total time is 10s/10,000ms.
1342
1418
Converting to s from ms by dividing by 1,000,
1343
1419
and ns to ms by dividing by 1,000,000. */
1345
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1346
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1347
1423
1348
if (debug){
1424
if(debug){
1349
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1350
1426
block_time);
1351
1427
}
1352
1428
1353
1429
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
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);
1358
1434
if(ret == 0){
1359
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1360
1436
return 0;
1361
1437
}
1362
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1364
1440
if(ret == -1){
1365
1441
perror_plus("clock_gettime");
1366
1442
return -1;
1367
1443
}
1368
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1369
1445
block_time = 0; /* Call avahi to find new Mandos
1370
1446
servers, but don't block */
1371
1447
}
1373
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1374
1450
}
1375
1451
if(ret != 0){
1376
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1377
1453
return (ret != 1) ? ret : 0;
1378
1454
}
1379
1455
}
1380
1456
}
1381
1457
}
1382
1458
1383
bool run_network_hooks(const char *mode, const char *interface,
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,
1384
1517
const float delay){
1385
1518
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
1520
alphasort);
1390
1521
if(numhooks == -1){
1391
perror_plus("scandir");
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
}
1392
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1393
1533
int devnull = open("/dev/null", O_RDONLY);
1394
1534
for(int i = 0; i < numhooks; i++){
1395
1535
direntry = direntries[i];
1406
1546
pid_t hook_pid = fork();
1407
1547
if(hook_pid == 0){
1408
1548
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
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
}
1412
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
1584
if(ret == -1){
1414
1585
perror_plus("setenv");
1415
return false;
1586
_exit(EX_OSERR);
1416
1587
}
1417
1588
ret = setenv("DEVICE", interface, 1);
1418
1589
if(ret == -1){
1419
1590
perror_plus("setenv");
1420
return false;
1591
_exit(EX_OSERR);
1421
1592
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1423
1594
if(ret == -1){
1424
1595
perror_plus("setenv");
1425
return false;
1596
_exit(EX_OSERR);
1426
1597
}
1427
1598
ret = setenv("MODE", mode, 1);
1428
1599
if(ret == -1){
1429
1600
perror_plus("setenv");
1430
return false;
1601
_exit(EX_OSERR);
1431
1602
}
1432
1603
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1434
1605
if(ret == -1){
1435
1606
perror_plus("asprintf");
1436
return false;
1607
_exit(EX_OSERR);
1437
1608
}
1438
1609
ret = setenv("DELAY", delaystring, 1);
1439
1610
if(ret == -1){
1440
1611
free(delaystring);
1441
1612
perror_plus("setenv");
1442
return false;
1613
_exit(EX_OSERR);
1443
1614
}
1444
1615
free(delaystring);
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
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
}
1447
1627
} else {
1448
1628
int status;
1449
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1480
1660
}
1481
1661
close(devnull);
1482
1662
}
1483
return true;
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
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1778
break;
1779
}
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1484
1863
}
1485
1864
1486
1865
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1487
1870
AvahiSServiceBrowser *sb = NULL;
1488
int error;
1871
error_t ret_errno;
1489
1872
int ret;
1490
1873
intmax_t tmpmax;
1491
1874
char *tmp;
1492
1875
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1500
bool tempdir_created = false;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1501
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1502
1882
const char *seckey = PATHDIR "/" SECKEY;
1503
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1504
1885
1505
1886
bool gnutls_initialized = false;
1506
1887
bool gpgme_initialized = false;
1568
1949
.group = 2 },
1569
1950
{ .name = "retry", .key = 132,
1570
1951
.arg = "SECONDS",
1571
.doc = "Retry interval used when denied by the mandos server",
1952
.doc = "Retry interval used when denied by the Mandos server",
1572
1953
.group = 2 },
1573
1954
{ .name = "network-hook-dir", .key = 133,
1574
1955
.arg = "DIR",
1597
1978
connect_to = arg;
1598
1979
break;
1599
1980
case 'i': /* --interface */
1600
interface = arg;
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1601
1986
break;
1602
1987
case 's': /* --seckey */
1603
1988
seckey = arg;
1646
2031
argp_state_help(state, state->out_stream,
1647
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
2033
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
2035
exit(argp_err_exit_status);
1653
2036
break;
1678
2061
}
1679
2062
}
1680
2063
1681
if(getuid() == 0){
2064
{
1682
2065
/* Work around Debian bug #633582:
1683
2066
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
2067
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
2073
} else {
2074
struct stat st;
2075
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2080
} else {
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2082
if(ret == -1){
2083
perror_plus("fstat");
2084
} else {
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2088
if(ret == -1){
2089
perror_plus("fchown");
2090
}
2091
}
2092
}
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2094
}
2095
}
2096
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2101
} else {
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2103
if(ret == -1){
2104
perror_plus("fstat");
2105
} else {
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2109
if(ret == -1){
2110
perror_plus("fchown");
2111
}
2112
}
2113
}
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2115
}
2116
}
2117
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
2140
}
1740
2141
}
1741
2142
}
1742
2143
1743
2144
/* Run network hooks */
1744
2145
{
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
1764
2157
}
1765
2158
1766
2159
if(not debug){
1767
2160
avahi_set_log_function(empty_log);
1768
2161
}
1769
2162
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
1802
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
2164
from the signal handler */
1804
2165
/* Initialize the pseudo-RNG for Avahi */
1805
2166
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
1808
2169
fprintf_plus(stderr,
1809
2170
"Avahi: Failed to create simple poll object.\n");
1810
2171
exitcode = EX_UNAVAILABLE;
1874
2235
}
1875
2236
}
1876
2237
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
2260
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
1962
2285
}
1963
2286
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
1981
2287
break;
1982
2288
}
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2316
}
2013
2317
2014
2318
if(quit_now){
2015
2319
goto end;
2016
2320
}
2017
2321
2018
ret = init_gnutls_global(pubkey, seckey);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2019
2323
if(ret == -1){
2020
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
2325
exitcode = EX_UNAVAILABLE;
2028
2332
goto end;
2029
2333
}
2030
2334
2031
if(mkdtemp(tempdir) == NULL){
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
2032
2345
perror_plus("mkdtemp");
2033
2346
goto end;
2034
2347
}
2035
tempdir_created = true;
2036
2348
2037
2349
if(quit_now){
2038
2350
goto end;
2039
2351
}
2040
2352
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2042
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2043
2355
exitcode = EX_UNAVAILABLE;
2044
2356
goto end;
2054
2366
/* Connect directly, do not use Zeroconf */
2055
2367
/* (Mainly meant for debugging) */
2056
2368
char *address = strrchr(connect_to, ':');
2369
2057
2370
if(address == NULL){
2058
2371
fprintf_plus(stderr, "No colon in address\n");
2059
2372
exitcode = EX_USAGE;
2064
2377
goto end;
2065
2378
}
2066
2379
2067
uint16_t port;
2380
in_port_t port;
2068
2381
errno = 0;
2069
2382
tmpmax = strtoimax(address+1, &tmp, 10);
2070
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2384
or tmpmax != (in_port_t)tmpmax){
2072
2385
fprintf_plus(stderr, "Bad port number\n");
2073
2386
exitcode = EX_USAGE;
2074
2387
goto end;
2075
2388
}
2076
2389
2077
2390
if(quit_now){
2078
2391
goto end;
2079
2392
}
2080
2393
2081
port = (uint16_t)tmpmax;
2394
port = (in_port_t)tmpmax;
2082
2395
*address = '\0';
2083
2396
/* Colon in address indicates IPv6 */
2084
2397
int af;
2100
2413
}
2101
2414
2102
2415
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2104
2418
if(quit_now or ret == 0){
2105
2419
break;
2106
2420
}
2108
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
2423
(int)retry_interval);
2110
2424
}
2111
sleep((int)retry_interval);
2425
sleep((unsigned int)retry_interval);
2112
2426
}
2113
2427
2114
if (not quit_now){
2428
if(not quit_now){
2115
2429
exitcode = EXIT_SUCCESS;
2116
2430
}
2117
2431
2132
2446
config.publish_domain = 0;
2133
2447
2134
2448
/* Allocate a new server */
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2138
2451
2139
2452
/* Free the Avahi configuration data */
2140
2453
avahi_server_config_free(&config);
2143
2456
/* Check if creating the Avahi server object succeeded */
2144
2457
if(mc.server == NULL){
2145
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2459
avahi_strerror(ret_errno));
2147
2460
exitcode = EX_UNAVAILABLE;
2148
2461
goto end;
2149
2462
}
2155
2468
/* Create the Avahi service browser */
2156
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2158
NULL, 0, browse_callback, NULL);
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2159
2473
if(sb == NULL){
2160
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
2475
avahi_strerror(avahi_server_errno(mc.server)));
2173
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2174
2488
}
2175
2489
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2178
2492
if(debug){
2179
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
2494
(ret == 0) ? "successfully" : "with error");
2187
2501
}
2188
2502
2189
2503
/* Cleanup things */
2504
free(mc.interfaces);
2505
2190
2506
if(sb != NULL)
2191
2507
avahi_s_service_browser_free(sb);
2192
2508
2193
2509
if(mc.server != NULL)
2194
2510
avahi_server_free(mc.server);
2195
2511
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2198
2514
2199
2515
if(gnutls_initialized){
2200
2516
gnutls_certificate_free_credentials(mc.cred);
2217
2533
}
2218
2534
}
2219
2535
2220
/* Re-raise priviliges */
2536
/* Re-raise privileges */
2221
2537
{
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2243
}
2244
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
2541
} else {
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
2564
}
2565
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
2569
}
2570
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2259
2574
2260
2575
/* Removes the GPGME temp directory and all files inside */
2261
if(tempdir_created){
2576
if(tempdir != NULL){
2262
2577
struct dirent **direntries = NULL;
2263
2578
struct dirent *direntry = NULL;
2264
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
2580
alphasort);
2266
if (numentries > 0){
2581
if(numentries > 0){
2267
2582
for(int i = 0; i < numentries; i++){
2268
2583
direntry = direntries[i];
2269
2584
char *fullname = NULL;
2284
2599
2285
2600
/* need to clean even if 0 because man page doesn't specify */
2286
2601
free(direntries);
2287
if (numentries == -1){
2602
if(numentries == -1){
2288
2603
perror_plus("scandir");
2289
2604
}
2290
2605
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0