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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect(),
59
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
#include <fcntl.h> /* open() */
61
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
62
*/
63
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
76
setgid(), pause(), _exit() */
78
77
#include <arpa/inet.h> /* inet_pton(), htons() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
142
141
static const char sys_class_net[] = "/sys/class/net";
143
142
char *connect_to = NULL;
144
143
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
144
uid_t uid = 65534;
147
145
gid_t gid = 65534;
148
146
185
183
perror(print_text);
186
184
}
187
185
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
189
187
int fprintf_plus(FILE *stream, const char *format, ...){
190
188
va_list ap;
191
189
va_start (ap, format);
200
198
* bytes. "buffer_capacity" is how much is currently allocated,
201
199
* "buffer_length" is how much is already used.
202
200
*/
203
__attribute__((nonnull, warn_unused_result))
204
201
size_t incbuffer(char **buffer, size_t buffer_length,
205
202
size_t buffer_capacity){
206
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
219
216
}
220
217
221
218
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
220
int af, server **current_server){
225
221
int ret;
234
230
.af = af };
235
231
if(new_server->ip == NULL){
236
232
perror_plus("strdup");
237
free(new_server);
238
233
return false;
239
234
}
240
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
236
if(ret == -1){
242
237
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
238
return false;
253
239
}
254
240
/* Special case of first server */
256
242
new_server->next = new_server;
257
243
new_server->prev = new_server;
258
244
*current_server = new_server;
245
/* Place the new server last in the list */
259
246
} else {
260
/* Place the new server last in the list */
261
247
new_server->next = *current_server;
262
248
new_server->prev = (*current_server)->prev;
263
249
new_server->prev->next = new_server;
269
255
/*
270
256
* Initialize GPGME.
271
257
*/
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){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
277
260
gpgme_error_t rc;
278
261
gpgme_engine_info_t engine_info;
279
262
280
263
/*
281
264
* Helper function to insert pub and seckey to the engine keyring.
282
265
*/
283
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
284
267
int ret;
285
268
int fd;
286
269
gpgme_data_t pgp_data;
305
288
return false;
306
289
}
307
290
308
ret = close(fd);
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
292
if(ret == -1){
310
293
perror_plus("close");
311
294
}
367
350
* Decrypt OpenPGP data.
368
351
* Returns -1 on error
369
352
*/
370
__attribute__((nonnull, warn_unused_result))
371
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
354
size_t crypto_size,
373
355
char **plaintext,
493
475
return plaintext_length;
494
476
}
495
477
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
505
479
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
507
483
}
508
484
509
485
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
486
static void debuggnutls(__attribute__((unused)) int level,
512
487
const char* string){
513
488
fprintf_plus(stderr, "GnuTLS: %s", string);
514
489
}
515
490
516
__attribute__((nonnull, warn_unused_result))
517
491
static int init_gnutls_global(const char *pubkeyfilename,
518
492
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
493
mandos_context *mc){
521
494
int ret;
522
unsigned int uret;
523
495
524
496
if(debug){
525
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
576
548
safer_gnutls_strerror(ret));
577
549
goto globalfail;
578
550
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
751
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
752
559
753
560
return 0;
760
567
return -1;
761
568
}
762
569
763
__attribute__((nonnull, warn_unused_result))
764
570
static int init_gnutls_session(gnutls_session_t *session,
765
571
mandos_context *mc){
766
572
int ret;
813
619
/* ignore client certificate if any. */
814
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
816
624
return 0;
817
625
}
818
626
820
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
629
__attribute__((unused)) const char *txt){}
822
630
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
1041
631
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
632
static int start_mandos_communication(const char *ip, in_port_t port,
1044
633
AvahiIfIndex if_index,
1045
634
int af, mandos_context *mc){
1046
635
int ret, tcp_sd = -1;
1047
636
ssize_t sret;
1048
struct sockaddr_storage to;
637
union {
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
640
} to;
1049
641
char *buffer = NULL;
1050
642
char *decrypted_buffer = NULL;
1051
643
size_t buffer_length = 0;
1054
646
int retval = -1;
1055
647
gnutls_session_t session;
1056
648
int pf; /* Protocol family */
1057
bool route_added = false;
1058
649
1059
650
errno = 0;
1060
651
1118
709
PRIuMAX "\n", ip, (uintmax_t)port);
1119
710
}
1120
711
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
713
if(tcp_sd < 0){
1123
714
int e = errno;
1124
715
perror_plus("socket");
1131
722
goto mandos_end;
1132
723
}
1133
724
725
memset(&to, 0, sizeof(to));
1134
726
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
729
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
732
}
1143
733
if(ret < 0 ){
1144
734
int e = errno;
1153
743
goto mandos_end;
1154
744
}
1155
745
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
1159
756
if(if_index == AVAHI_IF_UNSPEC){
1160
757
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
758
" incomplete without a network interface\n");
1163
760
goto mandos_end;
1164
761
}
1165
762
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
763
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
764
}
1168
765
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
766
to.in.sin_port = htons(port);
1170
767
}
1171
768
1172
769
if(quit_now){
1190
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
789
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
1195
791
addrstr, sizeof(addrstr), NULL, 0,
1196
792
NI_NUMERICHOST);
1197
793
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
1200
795
addrstr, sizeof(addrstr), NULL, 0,
1201
796
NI_NUMERICHOST);
1202
797
}
1214
809
goto mandos_end;
1215
810
}
1216
811
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
812
if(af == AF_INET6){
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
} else {
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
}
817
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
823
goto mandos_end;
824
}
825
826
if(quit_now){
827
errno = EINTR;
828
goto mandos_end;
1272
829
}
1273
830
1274
831
const char *out = mandos_protocol_version;
1457
1014
1458
1015
mandos_end:
1459
1016
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
1017
int e = errno;
1467
1018
free(decrypted_buffer);
1468
1019
free(buffer);
1469
1020
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
1022
}
1472
1023
if(ret == -1){
1473
1024
if(e == 0){
1485
1036
return retval;
1486
1037
}
1487
1038
1488
__attribute__((nonnull))
1489
1039
static void resolve_callback(AvahiSServiceResolver *r,
1490
1040
AvahiIfIndex interface,
1491
1041
AvahiProtocol proto,
1499
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
1051
flags,
1502
void *mc){
1052
void* mc){
1503
1053
if(r == NULL){
1504
1054
return;
1505
1055
}
1508
1058
timed out */
1509
1059
1510
1060
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1061
return;
1513
1062
}
1514
1063
1559
1108
const char *domain,
1560
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1110
flags,
1562
void *mc){
1111
void* mc){
1563
1112
if(b == NULL){
1564
1113
return;
1565
1114
}
1625
1174
errno = old_errno;
1626
1175
}
1627
1176
1628
__attribute__((nonnull, warn_unused_result))
1629
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1178
int ret;
1631
1179
error_t ret_errno;
1637
1185
errno = ret_errno;
1638
1186
return false;
1639
1187
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1188
strcpy(ifr->ifr_name, ifname);
1642
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1190
if(ret == -1){
1644
1191
if(debug){
1651
1198
return true;
1652
1199
}
1653
1200
1654
__attribute__((nonnull, warn_unused_result))
1655
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
1202
1657
1203
/* Reject the loopback device */
1699
1245
* corresponds to an acceptable network device.
1700
1246
* (This function is passed to scandir(3) as a filter function.)
1701
1247
*/
1702
__attribute__((nonnull, warn_unused_result))
1703
1248
int good_interface(const struct dirent *if_entry){
1704
1249
if(if_entry->d_name[0] == '.'){
1705
1250
return 0;
1723
1268
/*
1724
1269
* This function determines if a network interface is up.
1725
1270
*/
1726
__attribute__((nonnull, warn_unused_result))
1727
1271
bool interface_is_up(const char *interface){
1728
1272
struct ifreq ifr;
1729
1273
if(not get_flags(interface, &ifr)){
1740
1284
/*
1741
1285
* This function determines if a network interface is running
1742
1286
*/
1743
__attribute__((nonnull, warn_unused_result))
1744
1287
bool interface_is_running(const char *interface){
1745
1288
struct ifreq ifr;
1746
1289
if(not get_flags(interface, &ifr)){
1754
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
1298
}
1756
1299
1757
__attribute__((nonnull, pure, warn_unused_result))
1758
1300
int notdotentries(const struct dirent *direntry){
1759
1301
/* Skip "." and ".." */
1760
1302
if(direntry->d_name[0] == '.'
1767
1309
}
1768
1310
1769
1311
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
1312
int runnable_hook(const struct dirent *direntry){
1772
1313
int ret;
1773
1314
size_t sret;
1781
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
1323
"abcdefghijklmnopqrstuvwxyz"
1783
1324
"0123456789"
1784
"_.-");
1325
"_-");
1785
1326
if((direntry->d_name)[sret] != '\0'){
1786
1327
/* Contains non-allowed characters */
1787
1328
if(debug){
1791
1332
return 0;
1792
1333
}
1793
1334
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1795
1343
if(ret == -1){
1796
1344
if(debug){
1797
1345
perror_plus("Could not stat hook");
1821
1369
return 1;
1822
1370
}
1823
1371
1824
__attribute__((nonnull, warn_unused_result))
1825
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
1373
mandos_context *mc){
1827
1374
int ret;
1831
1378
1832
1379
while(true){
1833
1380
if(mc->current_server == NULL){
1834
if(debug){
1381
if (debug){
1835
1382
fprintf_plus(stderr, "Wait until first server is found."
1836
1383
" No timeout!\n");
1837
1384
}
1838
1385
ret = avahi_simple_poll_iterate(s, -1);
1839
1386
} else {
1840
if(debug){
1387
if (debug){
1841
1388
fprintf_plus(stderr, "Check current_server if we should run"
1842
1389
" it, or wait\n");
1843
1390
}
1860
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1861
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
1409
1863
if(debug){
1410
if (debug){
1864
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
1412
block_time);
1866
1413
}
1888
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
1436
}
1890
1437
if(ret != 0){
1891
if(ret > 0 or errno != EINTR){
1438
if (ret > 0 or errno != EINTR){
1892
1439
return (ret != 1) ? ret : 0;
1893
1440
}
1894
1441
}
1895
1442
}
1896
1443
}
1897
1444
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1900
1498
const float delay){
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1929
1502
if(numhooks == -1){
1930
perror_plus("scandir");
1931
return;
1932
}
1933
struct dirent *direntry;
1934
int ret;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1945
1510
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1992
1520
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1997
1579
free(delaystring);
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
2066
1591
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
2086
1628
}
2087
1629
2088
__attribute__((nonnull, warn_unused_result))
2089
1630
error_t bring_up_interface(const char *const interface,
2090
1631
const float delay){
1632
int sd = -1;
2091
1633
error_t old_errno = errno;
2092
int ret;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
2093
1636
struct ifreq network;
2094
1637
unsigned int if_index = if_nametoindex(interface);
2095
1638
if(if_index == 0){
2104
1647
}
2105
1648
2106
1649
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1650
if(not get_flags(interface, &network) and debug){
2109
1651
ret_errno = errno;
2110
1652
fprintf_plus(stderr, "Failed to get flags for interface "
2111
1653
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
1654
return ret_errno;
2114
1655
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
1656
network.ifr_flags |= IFF_UP;
2116
1657
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
2119
1660
ret_errno = errno;
2120
1661
perror_plus("socket");
2121
1662
errno = old_errno;
2122
1663
return ret_errno;
2123
1664
}
2124
1665
2125
1666
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1667
close(sd);
2130
1668
errno = old_errno;
2131
1669
return EINTR;
2132
1670
}
2136
1674
interface);
2137
1675
}
2138
1676
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
1677
/* Raise priviliges */
1678
raise_privileges();
2145
1679
2146
1680
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
2158
1688
}
2159
1689
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
2162
1692
#ifdef __linux__
2163
1693
if(restore_loglevel){
2164
1694
ret_linux = klogctl(7, NULL, 0);
2168
1698
}
2169
1699
#endif /* __linux__ */
2170
1700
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
1701
/* Lower privileges */
1702
lower_privileges();
2180
1703
2181
1704
/* Close the socket */
2182
ret = close(sd);
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1706
if(ret == -1){
2184
1707
perror_plus("close");
2185
1708
}
2186
1709
2187
1710
if(ret_setflags == -1){
2188
errno = ioctl_errno;
1711
errno = ret_errno;
2189
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
1713
errno = old_errno;
2191
return ioctl_errno;
1714
return ret_errno;
2192
1715
}
2193
1716
} else if(debug){
2194
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2212
1735
return 0;
2213
1736
}
2214
1737
2215
__attribute__((nonnull, warn_unused_result))
2216
1738
error_t take_down_interface(const char *const interface){
2217
1739
error_t old_errno = errno;
2218
1740
struct ifreq network;
2223
1745
return ENXIO;
2224
1746
}
2225
1747
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
1748
error_t ret_errno = 0;
2227
1749
if(not get_flags(interface, &network) and debug){
2228
1750
ret_errno = errno;
2229
1751
fprintf_plus(stderr, "Failed to get flags for interface "
2230
1752
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
1753
return ret_errno;
2233
1754
}
2234
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
1756
2236
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
1758
if(sd < 0){
2238
1759
ret_errno = errno;
2239
1760
perror_plus("socket");
2240
1761
errno = old_errno;
2246
1767
interface);
2247
1768
}
2248
1769
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
1770
/* Raise priviliges */
1771
raise_privileges();
2255
1772
2256
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
1774
ret_errno = errno;
2258
1775
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
1776
/* Lower privileges */
1777
lower_privileges();
2268
1778
2269
1779
/* Close the socket */
2270
int ret = close(sd);
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1781
if(ret == -1){
2272
1782
perror_plus("close");
2273
1783
}
2274
1784
2275
1785
if(ret_setflags == -1){
2276
errno = ioctl_errno;
1786
errno = ret_errno;
2277
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
1788
errno = old_errno;
2279
return ioctl_errno;
1789
return ret_errno;
2280
1790
}
2281
1791
} else if(debug){
2282
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
1798
}
2289
1799
2290
1800
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
2296
1805
AvahiSServiceBrowser *sb = NULL;
2297
1806
error_t ret_errno;
2298
1807
int ret;
2301
1810
int exitcode = EXIT_SUCCESS;
2302
1811
char *interfaces_to_take_down = NULL;
2303
1812
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1814
bool tempdir_created = false;
2307
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1816
const char *seckey = PATHDIR "/" SECKEY;
2309
1817
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
1818
char *interfaces_hooks = NULL;
2312
1819
2313
1820
bool gnutls_initialized = false;
2366
1873
.doc = "Bit length of the prime number used in the"
2367
1874
" Diffie-Hellman key exchange",
2368
1875
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
2374
1876
{ .name = "priority", .key = 130,
2375
1877
.arg = "STRING",
2376
1878
.doc = "GnuTLS priority string for the TLS handshake",
2431
1933
}
2432
1934
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1935
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1936
case 130: /* --priority */
2438
1937
mc.priority = arg;
2439
1938
break;
2495
1994
goto end;
2496
1995
}
2497
1996
}
2498
1997
2499
1998
{
2500
1999
/* Work around Debian bug #633582:
2501
2000
<http://bugs.debian.org/633582> */
2502
2001
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2509
2004
struct stat st;
2510
2005
2511
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2525
2020
}
2526
2021
}
2527
2022
}
2528
close(seckey_fd);
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2024
}
2530
2025
}
2531
2026
2532
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2029
if(pubkey_fd == -1){
2546
2041
}
2547
2042
}
2548
2043
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2575
2048
/* Lower privileges */
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2579
perror_plus("Failed to lower privileges");
2580
}
2049
lower_privileges();
2581
2050
}
2582
2051
}
2583
2052
2609
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
2080
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2614
2085
}
2615
2086
2616
2087
if(not debug){
2694
2165
2695
2166
/* If no interfaces were specified, make a list */
2696
2167
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2168
struct dirent **direntries;
2698
2169
/* Look for any good interfaces */
2699
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2700
2171
alphasort);
2706
2177
if(ret_errno != 0){
2707
2178
errno = ret_errno;
2708
2179
perror_plus("argz_add");
2709
free(direntries[i]);
2710
2180
continue;
2711
2181
}
2712
2182
if(debug){
2713
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
2184
direntries[i]->d_name);
2715
2185
}
2716
free(direntries[i]);
2717
2186
}
2718
2187
free(direntries);
2719
2188
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2189
free(direntries);
2723
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2724
2191
exitcode = EXIT_FAILURE;
2725
2192
goto end;
2748
2215
break;
2749
2216
}
2750
2217
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2218
ret = bring_up_interface(interface, delay);
2752
2219
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2756
2223
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2761
2229
perror_plus("argz_add");
2762
2230
}
2763
2231
}
2781
2249
goto end;
2782
2250
}
2783
2251
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2253
if(ret == -1){
2786
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2255
exitcode = EX_UNAVAILABLE;
2794
2262
goto end;
2795
2263
}
2796
2264
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2265
if(mkdtemp(tempdir) == NULL){
2807
2266
perror_plus("mkdtemp");
2808
2267
goto end;
2809
2268
}
2269
tempdir_created = true;
2810
2270
2811
2271
if(quit_now){
2812
2272
goto end;
2887
2347
sleep((unsigned int)retry_interval);
2888
2348
}
2889
2349
2890
if(not quit_now){
2350
if (not quit_now){
2891
2351
exitcode = EXIT_SUCCESS;
2892
2352
}
2893
2353
2948
2408
if(debug){
2949
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2410
}
2951
2411
2952
2412
ret = avahi_loop_with_timeout(simple_poll,
2953
2413
(int)(retry_interval * 1000), &mc);
2954
2414
if(debug){
2990
2450
mc.current_server->prev->next = NULL;
2991
2451
while(mc.current_server != NULL){
2992
2452
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
3001
2453
free(mc.current_server);
3002
2454
mc.current_server = next;
3003
2455
}
3004
2456
}
3005
2457
3006
/* Re-raise privileges */
2458
/* Re-raise priviliges */
3007
2459
{
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to raise privileges");
3012
} else {
3013
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3017
3018
/* Take down the network interfaces which were brought up */
3019
{
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3027
perror_plus("Failed to take down interface");
3028
}
3029
}
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3032
" down\n");
3033
}
3034
}
3035
}
3036
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
3041
}
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2476
}
2477
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2481
}
2482
}
2483
2484
lower_privileges_permanently();
3042
2485
}
3043
2486
3044
2487
free(interfaces_to_take_down);
3045
2488
free(interfaces_hooks);
3046
2489
3047
2490
/* Removes the GPGME temp directory and all files inside */
3048
if(tempdir != NULL){
2491
if(tempdir_created){
3049
2492
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
2499
char *fullname = NULL;
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
direntry->d_name);
2502
if(ret < 0){
2503
perror_plus("asprintf");
2504
continue;
2505
}
2506
ret = remove(fullname);
2507
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
2510
}
2511
free(fullname);
3089
2512
}
3090
close(tempdir_fd);
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
2519
}
2520
ret = rmdir(tempdir);
2521
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
3091
2523
}
3092
2524
}
3093
2525
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0