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- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: (237.7.144 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- files removed:
- debian/upstream
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
138
uid_t uid = 65534;
147
139
gid_t gid = 65534;
148
140
149
141
/* Doubly linked list that need to be circularly linked when used */
150
142
typedef struct server{
151
143
const char *ip;
152
in_port_t port;
144
uint16_t port;
153
145
AvahiIfIndex if_index;
154
146
int af;
155
147
struct timespec last_seen;
159
151
160
152
/* Used for passing in values through the Avahi callback functions */
161
153
typedef struct {
154
AvahiSimplePoll *simple_poll;
162
155
AvahiServer *server;
163
156
gnutls_certificate_credentials_t cred;
164
157
unsigned int dh_bits;
166
159
const char *priority;
167
160
gpgme_ctx_t ctx;
168
161
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
162
} mandos_context;
172
163
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
175
169
176
170
sig_atomic_t quit_now = 0;
177
171
int signal_received = 0;
185
179
perror(print_text);
186
180
}
187
181
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
__attribute__((format (gnu_printf, 2, 3)))
189
183
int fprintf_plus(FILE *stream, const char *format, ...){
190
184
va_list ap;
191
185
va_start (ap, format);
192
186
193
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
188
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
190
}
197
191
198
192
/*
200
194
* bytes. "buffer_capacity" is how much is currently allocated,
201
195
* "buffer_length" is how much is already used.
202
196
*/
203
__attribute__((nonnull, warn_unused_result))
204
197
size_t incbuffer(char **buffer, size_t buffer_length,
205
198
size_t buffer_capacity){
206
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
213
202
return 0;
214
203
}
215
*buffer = new_buf;
216
204
buffer_capacity += BUFFER_SIZE;
217
205
}
218
206
return buffer_capacity;
219
207
}
220
208
221
209
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
225
212
int ret;
226
213
server *new_server = malloc(sizeof(server));
227
214
if(new_server == NULL){
234
221
.af = af };
235
222
if(new_server->ip == NULL){
236
223
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
224
return false;
253
225
}
254
226
/* Special case of first server */
255
if(*current_server == NULL){
227
if (mc.current_server == NULL){
256
228
new_server->next = new_server;
257
229
new_server->prev = new_server;
258
*current_server = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
259
232
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
263
235
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
265
242
}
266
243
return true;
267
244
}
269
246
/*
270
247
* Initialize GPGME.
271
248
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
277
251
gpgme_error_t rc;
278
252
gpgme_engine_info_t engine_info;
279
253
254
280
255
/*
281
256
* Helper function to insert pub and seckey to the engine keyring.
282
257
*/
283
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
284
259
int ret;
285
260
int fd;
286
261
gpgme_data_t pgp_data;
298
273
return false;
299
274
}
300
275
301
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
302
277
if(rc != GPG_ERR_NO_ERROR){
303
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
279
gpgme_strsource(rc), gpgme_strerror(rc));
348
323
}
349
324
350
325
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
352
327
if(rc != GPG_ERR_NO_ERROR){
353
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
342
* Decrypt OpenPGP data.
368
343
* Returns -1 on error
369
344
*/
370
__attribute__((nonnull, warn_unused_result))
371
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
346
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
347
char **plaintext){
375
348
gpgme_data_t dh_crypto, dh_plain;
376
349
gpgme_error_t rc;
377
350
ssize_t ret;
403
376
404
377
/* Decrypt data from the cryptotext data buffer to the plaintext
405
378
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
380
if(rc != GPG_ERR_NO_ERROR){
408
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
382
gpgme_strsource(rc), gpgme_strerror(rc));
410
383
plaintext_length = -1;
411
384
if(debug){
412
385
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
414
387
if(result == NULL){
415
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
389
} else {
493
466
return plaintext_length;
494
467
}
495
468
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
499
472
if(ret == NULL)
500
473
ret = "(unknown)";
501
474
return ret;
502
475
}
503
476
504
477
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
478
static void debuggnutls(__attribute__((unused)) int level,
507
479
const char* string){
508
480
fprintf_plus(stderr, "GnuTLS: %s", string);
509
481
}
510
482
511
__attribute__((nonnull, warn_unused_result))
512
483
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
484
const char *seckeyfilename){
515
485
int ret;
516
486
517
487
if(debug){
534
504
}
535
505
536
506
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
508
if(ret != GNUTLS_E_SUCCESS){
539
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
510
safer_gnutls_strerror(ret));
550
520
}
551
521
552
522
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
554
524
GNUTLS_OPENPGP_FMT_BASE64);
555
525
if(ret != GNUTLS_E_SUCCESS){
556
526
fprintf_plus(stderr,
562
532
}
563
533
564
534
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
566
536
if(ret != GNUTLS_E_SUCCESS){
567
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
538
" initialization: %s\n",
569
539
safer_gnutls_strerror(ret));
570
540
goto globalfail;
571
541
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
543
if(ret != GNUTLS_E_SUCCESS){
574
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
545
safer_gnutls_strerror(ret));
576
546
goto globalfail;
577
547
}
578
548
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
550
581
551
return 0;
582
552
583
553
globalfail:
584
554
585
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_certificate_free_credentials(mc.cred);
586
556
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_dh_params_deinit(mc.dh_params);
588
558
return -1;
589
559
}
590
560
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
594
562
int ret;
595
563
/* GnuTLS session creation */
596
564
do {
608
576
{
609
577
const char *err;
610
578
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
580
if(quit_now){
613
581
gnutls_deinit(*session);
614
582
return -1;
625
593
626
594
do {
627
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
596
mc.cred);
629
597
if(quit_now){
630
598
gnutls_deinit(*session);
631
599
return -1;
641
609
/* ignore client certificate if any. */
642
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
611
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
613
646
614
return 0;
647
615
}
651
619
__attribute__((unused)) const char *txt){}
652
620
653
621
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
622
static int start_mandos_communication(const char *ip, uint16_t port,
656
623
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
624
int af){
658
625
int ret, tcp_sd = -1;
659
626
ssize_t sret;
660
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
661
631
char *buffer = NULL;
662
632
char *decrypted_buffer = NULL;
663
633
size_t buffer_length = 0;
687
657
return -1;
688
658
}
689
659
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
660
ret = init_gnutls_session(&session);
723
661
if(ret != 0){
724
662
return -1;
725
663
}
726
664
727
665
if(debug){
728
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
667
PRIu16 "\n", ip, port);
730
668
}
731
669
732
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
682
745
683
memset(&to, 0, sizeof(to));
746
684
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
687
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
752
690
}
753
691
if(ret < 0 ){
754
692
int e = errno;
763
701
goto mandos_end;
764
702
}
765
703
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
769
711
if(if_index == AVAHI_IF_UNSPEC){
770
712
fprintf_plus(stderr, "An IPv6 link-local address is"
771
713
" incomplete without a network interface\n");
773
715
goto mandos_end;
774
716
}
775
717
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
to.in6.sin6_scope_id = (uint32_t)if_index;
777
719
}
778
720
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
780
724
}
781
725
782
726
if(quit_now){
790
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
735
perror_plus("if_indextoname");
792
736
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
795
739
}
796
740
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
799
743
}
800
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
802
747
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
807
750
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
812
753
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
819
760
}
820
761
}
821
762
825
766
}
826
767
827
768
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
770
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
772
}
834
773
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
775
int e = errno;
837
776
perror_plus("connect");
838
777
errno = e;
999
938
if(buffer_length > 0){
1000
939
ssize_t decrypted_buffer_size;
1001
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
941
&decrypted_buffer);
1003
942
if(decrypted_buffer_size >= 0){
1004
943
1005
944
written = 0;
1053
992
return retval;
1054
993
}
1055
994
1056
__attribute__((nonnull))
1057
995
static void resolve_callback(AvahiSServiceResolver *r,
1058
996
AvahiIfIndex interface,
1059
997
AvahiProtocol proto,
1067
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
1007
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1074
1010
1075
1011
/* Called whenever a service has been resolved successfully or
1076
1012
timed out */
1077
1013
1078
1014
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
1015
return;
1081
1016
}
1082
1017
1086
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
1023
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1024
avahi_strerror(avahi_server_errno(mc.server)));
1091
1025
break;
1092
1026
1093
1027
case AVAHI_RESOLVER_FOUND:
1099
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
1034
host_name, ip, (intmax_t)interface, port);
1101
1035
}
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1106
1038
if(ret == 0){
1107
avahi_simple_poll_quit(simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1108
1040
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1112
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
1044
" list\n", name);
1114
1045
}
1127
1058
const char *domain,
1128
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1129
1060
flags,
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1134
1063
1135
1064
/* Called whenever a new services becomes available on the LAN or
1136
1065
is removed from the LAN */
1144
1073
case AVAHI_BROWSER_FAILURE:
1145
1074
1146
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1150
1078
return;
1151
1079
1152
1080
case AVAHI_BROWSER_NEW:
1155
1083
the callback function is called the Avahi server will free the
1156
1084
resolver for us. */
1157
1085
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1162
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
1090
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1091
avahi_strerror(avahi_server_errno(mc.server)));
1166
1092
break;
1167
1093
1168
1094
case AVAHI_BROWSER_REMOVE:
1187
1113
signal_received = sig;
1188
1114
int old_errno = errno;
1189
1115
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1192
1118
}
1193
1119
errno = old_errno;
1194
1120
}
1195
1121
1196
__attribute__((nonnull, warn_unused_result))
1197
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
1123
int ret;
1199
error_t ret_errno;
1200
1124
1201
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1126
if(s < 0){
1203
ret_errno = errno;
1204
1127
perror_plus("socket");
1205
errno = ret_errno;
1206
1128
return false;
1207
1129
}
1208
1130
strcpy(ifr->ifr_name, ifname);
1209
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
1132
if(ret == -1){
1211
1133
if(debug){
1212
ret_errno = errno;
1213
1134
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
1135
}
1216
1136
return false;
1217
1137
}
1218
1138
return true;
1219
1139
}
1220
1140
1221
__attribute__((nonnull, warn_unused_result))
1222
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1142
1224
1143
/* Reject the loopback device */
1266
1185
* corresponds to an acceptable network device.
1267
1186
* (This function is passed to scandir(3) as a filter function.)
1268
1187
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
1188
int good_interface(const struct dirent *if_entry){
1271
1189
if(if_entry->d_name[0] == '.'){
1272
1190
return 0;
1288
1206
}
1289
1207
1290
1208
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1325
1251
int notdotentries(const struct dirent *direntry){
1326
1252
/* Skip "." and ".." */
1327
1253
if(direntry->d_name[0] == '.'
1334
1260
}
1335
1261
1336
1262
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
1263
int runnable_hook(const struct dirent *direntry){
1339
1264
int ret;
1340
1265
size_t sret;
1348
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
1274
"abcdefghijklmnopqrstuvwxyz"
1350
1275
"0123456789"
1351
"_.-");
1276
"_-");
1352
1277
if((direntry->d_name)[sret] != '\0'){
1353
1278
/* Contains non-allowed characters */
1354
1279
if(debug){
1358
1283
return 0;
1359
1284
}
1360
1285
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1362
1294
if(ret == -1){
1363
1295
if(debug){
1364
1296
perror_plus("Could not stat hook");
1388
1320
return 1;
1389
1321
}
1390
1322
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1394
1324
int ret;
1395
1325
struct timespec now;
1396
1326
struct timespec waited_time;
1397
1327
intmax_t block_time;
1398
1328
1399
1329
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1330
if(mc.current_server == NULL){
1331
if (debug){
1402
1332
fprintf_plus(stderr, "Wait until first server is found."
1403
1333
" No timeout!\n");
1404
1334
}
1405
1335
ret = avahi_simple_poll_iterate(s, -1);
1406
1336
} else {
1407
if(debug){
1337
if (debug){
1408
1338
fprintf_plus(stderr, "Check current_server if we should run"
1409
1339
" it, or wait\n");
1410
1340
}
1417
1347
/* Calculating in ms how long time between now and server
1418
1348
who we visted longest time ago. Now - last seen. */
1419
1349
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1350
- mc.current_server->last_seen.tv_sec);
1421
1351
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1352
- mc.current_server->last_seen.tv_nsec);
1423
1353
/* total time is 10s/10,000ms.
1424
1354
Converting to s from ms by dividing by 1,000,
1425
1355
and ns to ms by dividing by 1,000,000. */
1427
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1428
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1359
1430
if(debug){
1360
if (debug){
1431
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
1362
block_time);
1433
1363
}
1434
1364
1435
1365
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1440
1370
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1371
avahi_simple_poll_quit(mc.simple_poll);
1442
1372
return 0;
1443
1373
}
1444
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1375
&mc.current_server->last_seen);
1446
1376
if(ret == -1){
1447
1377
perror_plus("clock_gettime");
1448
1378
return -1;
1449
1379
}
1450
mc->current_server = mc->current_server->next;
1380
mc.current_server = mc.current_server->next;
1451
1381
block_time = 0; /* Call avahi to find new Mandos
1452
1382
servers, but don't block */
1453
1383
}
1455
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
1386
}
1457
1387
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1388
if (ret > 0 or errno != EINTR){
1459
1389
return (ret != 1) ? ret : 0;
1460
1390
}
1461
1391
}
1463
1393
}
1464
1394
1465
1395
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
1396
error_t raise_privileges(void){
1468
1397
error_t old_errno = errno;
1469
1398
error_t ret_errno = 0;
1470
1399
if(seteuid(0) == -1){
1471
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1472
1402
}
1473
1403
errno = old_errno;
1474
1404
return ret_errno;
1475
1405
}
1476
1406
1477
1407
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
1408
error_t raise_privileges_permanently(void){
1480
1409
error_t old_errno = errno;
1481
1410
error_t ret_errno = raise_privileges();
1485
1414
}
1486
1415
if(setuid(0) == -1){
1487
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1488
1418
}
1489
1419
errno = old_errno;
1490
1420
return ret_errno;
1491
1421
}
1492
1422
1493
1423
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
1424
error_t lower_privileges(void){
1496
1425
error_t old_errno = errno;
1497
1426
error_t ret_errno = 0;
1498
1427
if(seteuid(uid) == -1){
1499
1428
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1519
1436
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1547
1442
if(numhooks == -1){
1548
1443
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1621
1451
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1626
1510
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1673
1522
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
1693
1559
}
1694
1560
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1563
int sd = -1;
1564
int old_errno = errno;
1565
int ret_errno = 0;
1699
1566
int ret;
1700
1567
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1702
1569
if(if_index == 0){
1703
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
1571
errno = old_errno;
1710
1577
return EINTR;
1711
1578
}
1712
1579
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1790
1632
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1633
ret_errno = errno;
1796
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1797
1645
errno = old_errno;
1798
return ioctl_errno;
1646
return ret_errno;
1799
1647
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
1648
}
1804
1805
1649
/* Sleep checking until interface is running.
1806
1650
Check every 0.25s, up to total time of delay */
1807
1651
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1809
1656
break;
1810
1657
}
1811
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1814
1661
perror_plus("nanosleep");
1815
1662
}
1816
1663
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1831
1668
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1878
1673
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1674
perror_plus("klogctl");
1675
}
1891
1676
}
1892
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1893
1680
errno = old_errno;
1894
1681
return 0;
1895
1682
}
1896
1683
1897
1684
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1902
1685
AvahiSServiceBrowser *sb = NULL;
1903
error_t ret_errno;
1686
int error;
1904
1687
int ret;
1905
1688
intmax_t tmpmax;
1906
1689
char *tmp;
1907
1690
int exitcode = EXIT_SUCCESS;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
1913
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1914
1698
const char *seckey = PATHDIR "/" SECKEY;
1915
1699
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1917
1700
1918
1701
bool gnutls_initialized = false;
1919
1702
bool gpgme_initialized = false;
2010
1793
connect_to = arg;
2011
1794
break;
2012
1795
case 'i': /* --interface */
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
1796
interface = arg;
2018
1797
break;
2019
1798
case 's': /* --seckey */
2020
1799
seckey = arg;
2097
1876
/* Work around Debian bug #633582:
2098
1877
<http://bugs.debian.org/633582> */
2099
1878
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
2105
} else {
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
2106
1881
struct stat st;
2107
1882
2108
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2148
1923
}
2149
1924
2150
1925
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
2172
1930
}
2173
1931
}
2174
1932
}
2175
1933
2176
1934
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1937
}
1938
1939
if(not debug){
1940
avahi_set_log_function(empty_log);
1941
}
1942
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
2181
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
2182
1964
goto end;
2183
1965
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
2186
1972
}
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
2189
}
2190
2191
if(not debug){
2192
avahi_set_log_function(empty_log);
2193
1973
}
2194
1974
2195
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2196
1976
from the signal handler */
2197
1977
/* Initialize the pseudo-RNG for Avahi */
2198
1978
srand((unsigned int) time(NULL));
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
2201
1981
fprintf_plus(stderr,
2202
1982
"Avahi: Failed to create simple poll object.\n");
2203
1983
exitcode = EX_UNAVAILABLE;
2267
2047
}
2268
2048
}
2269
2049
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
}
2322
}
2323
break;
2324
}
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2352
2057
}
2353
2058
2354
2059
if(quit_now){
2355
2060
goto end;
2356
2061
}
2357
2062
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2063
ret = init_gnutls_global(pubkey, seckey);
2359
2064
if(ret == -1){
2360
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2361
2066
exitcode = EX_UNAVAILABLE;
2368
2073
goto end;
2369
2074
}
2370
2075
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
2076
if(mkdtemp(tempdir) == NULL){
2381
2077
perror_plus("mkdtemp");
2382
2078
goto end;
2383
2079
}
2080
tempdir_created = true;
2384
2081
2385
2082
if(quit_now){
2386
2083
goto end;
2387
2084
}
2388
2085
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2390
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2391
2088
exitcode = EX_UNAVAILABLE;
2392
2089
goto end;
2413
2110
goto end;
2414
2111
}
2415
2112
2416
in_port_t port;
2113
uint16_t port;
2417
2114
errno = 0;
2418
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2419
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2420
or tmpmax != (in_port_t)tmpmax){
2117
or tmpmax != (uint16_t)tmpmax){
2421
2118
fprintf_plus(stderr, "Bad port number\n");
2422
2119
exitcode = EX_USAGE;
2423
2120
goto end;
2424
2121
}
2425
2122
2426
2123
if(quit_now){
2427
2124
goto end;
2428
2125
}
2429
2126
2430
port = (in_port_t)tmpmax;
2127
port = (uint16_t)tmpmax;
2431
2128
*address = '\0';
2432
2129
/* Colon in address indicates IPv6 */
2433
2130
int af;
2449
2146
}
2450
2147
2451
2148
while(not quit_now){
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
2149
ret = start_mandos_communication(address, port, if_index, af);
2454
2150
if(quit_now or ret == 0){
2455
2151
break;
2456
2152
}
2458
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
2155
(int)retry_interval);
2460
2156
}
2461
sleep((unsigned int)retry_interval);
2157
sleep((int)retry_interval);
2462
2158
}
2463
2159
2464
if(not quit_now){
2160
if (not quit_now){
2465
2161
exitcode = EXIT_SUCCESS;
2466
2162
}
2467
2163
2482
2178
config.publish_domain = 0;
2483
2179
2484
2180
/* Allocate a new server */
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
2487
2184
2488
2185
/* Free the Avahi configuration data */
2489
2186
avahi_server_config_free(&config);
2492
2189
/* Check if creating the Avahi server object succeeded */
2493
2190
if(mc.server == NULL){
2494
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2192
avahi_strerror(error));
2496
2193
exitcode = EX_UNAVAILABLE;
2497
2194
goto end;
2498
2195
}
2504
2201
/* Create the Avahi service browser */
2505
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
2506
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
2204
NULL, 0, browse_callback, NULL);
2509
2205
if(sb == NULL){
2510
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
2207
avahi_strerror(avahi_server_errno(mc.server)));
2522
2218
if(debug){
2523
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2524
2220
}
2525
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2528
2224
if(debug){
2529
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
2226
(ret == 0) ? "successfully" : "with error");
2537
2233
}
2538
2234
2539
2235
/* Cleanup things */
2540
free(mc.interfaces);
2541
2542
2236
if(sb != NULL)
2543
2237
avahi_s_service_browser_free(sb);
2544
2238
2545
2239
if(mc.server != NULL)
2546
2240
avahi_server_free(mc.server);
2547
2241
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2550
2244
2551
2245
if(gnutls_initialized){
2552
2246
gnutls_certificate_free_credentials(mc.cred);
2564
2258
mc.current_server->prev->next = NULL;
2565
2259
while(mc.current_server != NULL){
2566
2260
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2575
2261
free(mc.current_server);
2576
2262
mc.current_server = next;
2577
2263
}
2578
2264
}
2579
2265
2580
/* Re-raise privileges */
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
2581
2270
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2609
}
2271
raise_privileges();
2610
2272
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
}
2284
}
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2288
}
2615
2289
}
2616
2290
}
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2620
2297
2621
2298
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2299
if(tempdir_created){
2623
2300
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
direntry->d_name);
2310
if(ret < 0){
2311
perror_plus("asprintf");
2312
continue;
2313
}
2314
ret = remove(fullname);
2315
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2318
}
2319
free(fullname);
2661
2320
}
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
2327
}
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2663
2331
}
2664
2332
}
2665
2333
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0