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- Committer: Teddy Hogeborn
- Date: 2014-03-10 07:04:09 UTC
- Revision ID: teddy@recompile.se-20140310070409-ho6p1wrnpopi2ny1
White space fix: change "if (" to "if(" in C code.
* plugins.d/askpass-fifo.c (error_plus): White space fix.
* plugins.d/password-prompt.c (error_plus, conflict_detection,
main): - '' -
* plugins.d/plymouth.c (error_plus, exec_and_wait, get_pid): - '' -
* plugins.d/splashy.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): White space fix.
* plugins.d/password-prompt.c (error_plus, conflict_detection,
main): - '' -
* plugins.d/plymouth.c (error_plus, exec_and_wait, get_pid): - '' -
* plugins.d/splashy.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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(), strcpy() */
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){
1054
643
int retval = -1;
1055
644
gnutls_session_t session;
1056
645
int pf; /* Protocol family */
1057
bool route_added = false;
1058
646
1059
647
errno = 0;
1060
648
1118
706
PRIuMAX "\n", ip, (uintmax_t)port);
1119
707
}
1120
708
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
710
if(tcp_sd < 0){
1123
711
int e = errno;
1124
712
perror_plus("socket");
1131
719
goto mandos_end;
1132
720
}
1133
721
722
memset(&to, 0, sizeof(to));
1134
723
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);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1138
726
} 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);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1142
729
}
1143
730
if(ret < 0 ){
1144
731
int e = errno;
1153
740
goto mandos_end;
1154
741
}
1155
742
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
744
if(IN6_IS_ADDR_LINKLOCAL
1158
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
746
if(if_index == AVAHI_IF_UNSPEC){
1214
801
goto mandos_end;
1215
802
}
1216
803
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
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;
804
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
807
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
810
}
811
if(ret < 0){
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
817
goto mandos_end;
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
1272
823
}
1273
824
1274
825
const char *out = mandos_protocol_version;
1457
1008
1458
1009
mandos_end:
1459
1010
{
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
1011
int e = errno;
1467
1012
free(decrypted_buffer);
1468
1013
free(buffer);
1469
1014
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
1016
}
1472
1017
if(ret == -1){
1473
1018
if(e == 0){
1485
1030
return retval;
1486
1031
}
1487
1032
1488
__attribute__((nonnull))
1489
1033
static void resolve_callback(AvahiSServiceResolver *r,
1490
1034
AvahiIfIndex interface,
1491
1035
AvahiProtocol proto,
1499
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
1045
flags,
1502
void *mc){
1046
void* mc){
1503
1047
if(r == NULL){
1504
1048
return;
1505
1049
}
1508
1052
timed out */
1509
1053
1510
1054
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1055
return;
1513
1056
}
1514
1057
1559
1102
const char *domain,
1560
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1104
flags,
1562
void *mc){
1105
void* mc){
1563
1106
if(b == NULL){
1564
1107
return;
1565
1108
}
1625
1168
errno = old_errno;
1626
1169
}
1627
1170
1628
__attribute__((nonnull, warn_unused_result))
1629
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1172
int ret;
1631
1173
error_t ret_errno;
1650
1192
return true;
1651
1193
}
1652
1194
1653
__attribute__((nonnull, warn_unused_result))
1654
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
1196
1656
1197
/* Reject the loopback device */
1698
1239
* corresponds to an acceptable network device.
1699
1240
* (This function is passed to scandir(3) as a filter function.)
1700
1241
*/
1701
__attribute__((nonnull, warn_unused_result))
1702
1242
int good_interface(const struct dirent *if_entry){
1703
1243
if(if_entry->d_name[0] == '.'){
1704
1244
return 0;
1722
1262
/*
1723
1263
* This function determines if a network interface is up.
1724
1264
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
1265
bool interface_is_up(const char *interface){
1727
1266
struct ifreq ifr;
1728
1267
if(not get_flags(interface, &ifr)){
1739
1278
/*
1740
1279
* This function determines if a network interface is running
1741
1280
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
1281
bool interface_is_running(const char *interface){
1744
1282
struct ifreq ifr;
1745
1283
if(not get_flags(interface, &ifr)){
1753
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
1292
}
1755
1293
1756
__attribute__((nonnull, pure, warn_unused_result))
1757
1294
int notdotentries(const struct dirent *direntry){
1758
1295
/* Skip "." and ".." */
1759
1296
if(direntry->d_name[0] == '.'
1766
1303
}
1767
1304
1768
1305
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
1306
int runnable_hook(const struct dirent *direntry){
1771
1307
int ret;
1772
1308
size_t sret;
1780
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
1317
"abcdefghijklmnopqrstuvwxyz"
1782
1318
"0123456789"
1783
"_.-");
1319
"_-");
1784
1320
if((direntry->d_name)[sret] != '\0'){
1785
1321
/* Contains non-allowed characters */
1786
1322
if(debug){
1790
1326
return 0;
1791
1327
}
1792
1328
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1794
1337
if(ret == -1){
1795
1338
if(debug){
1796
1339
perror_plus("Could not stat hook");
1820
1363
return 1;
1821
1364
}
1822
1365
1823
__attribute__((nonnull, warn_unused_result))
1824
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
1367
mandos_context *mc){
1826
1368
int ret;
1830
1372
1831
1373
while(true){
1832
1374
if(mc->current_server == NULL){
1833
if(debug){
1375
if (debug){
1834
1376
fprintf_plus(stderr, "Wait until first server is found."
1835
1377
" No timeout!\n");
1836
1378
}
1837
1379
ret = avahi_simple_poll_iterate(s, -1);
1838
1380
} else {
1839
if(debug){
1381
if (debug){
1840
1382
fprintf_plus(stderr, "Check current_server if we should run"
1841
1383
" it, or wait\n");
1842
1384
}
1859
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1860
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
1403
1862
if(debug){
1404
if (debug){
1863
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
1406
block_time);
1865
1407
}
1887
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
1430
}
1889
1431
if(ret != 0){
1890
if(ret > 0 or errno != EINTR){
1432
if (ret > 0 or errno != EINTR){
1891
1433
return (ret != 1) ? ret : 0;
1892
1434
}
1893
1435
}
1894
1436
}
1895
1437
}
1896
1438
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1899
1492
const float delay){
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1928
1496
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1944
1504
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1991
1514
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1996
1573
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
2065
1585
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
2085
1622
}
2086
1623
2087
__attribute__((nonnull, warn_unused_result))
2088
1624
error_t bring_up_interface(const char *const interface,
2089
1625
const float delay){
1626
int sd = -1;
2090
1627
error_t old_errno = errno;
2091
int ret;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2092
1630
struct ifreq network;
2093
1631
unsigned int if_index = if_nametoindex(interface);
2094
1632
if(if_index == 0){
2103
1641
}
2104
1642
2105
1643
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
1644
if(not get_flags(interface, &network) and debug){
2108
1645
ret_errno = errno;
2109
1646
fprintf_plus(stderr, "Failed to get flags for interface "
2110
1647
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
1648
return ret_errno;
2113
1649
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
1650
network.ifr_flags |= IFF_UP;
2115
1651
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2118
1654
ret_errno = errno;
2119
1655
perror_plus("socket");
2120
1656
errno = old_errno;
2121
1657
return ret_errno;
2122
1658
}
2123
1659
2124
1660
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
1661
close(sd);
2129
1662
errno = old_errno;
2130
1663
return EINTR;
2131
1664
}
2135
1668
interface);
2136
1669
}
2137
1670
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
1671
/* Raise priviliges */
1672
raise_privileges();
2144
1673
2145
1674
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
2157
1682
}
2158
1683
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2161
1686
#ifdef __linux__
2162
1687
if(restore_loglevel){
2163
1688
ret_linux = klogctl(7, NULL, 0);
2167
1692
}
2168
1693
#endif /* __linux__ */
2169
1694
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
1695
/* Lower privileges */
1696
lower_privileges();
2179
1697
2180
1698
/* Close the socket */
2181
ret = close(sd);
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1700
if(ret == -1){
2183
1701
perror_plus("close");
2184
1702
}
2185
1703
2186
1704
if(ret_setflags == -1){
2187
errno = ioctl_errno;
1705
errno = ret_errno;
2188
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
1707
errno = old_errno;
2190
return ioctl_errno;
1708
return ret_errno;
2191
1709
}
2192
1710
} else if(debug){
2193
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2211
1729
return 0;
2212
1730
}
2213
1731
2214
__attribute__((nonnull, warn_unused_result))
2215
1732
error_t take_down_interface(const char *const interface){
2216
1733
error_t old_errno = errno;
2217
1734
struct ifreq network;
2222
1739
return ENXIO;
2223
1740
}
2224
1741
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
1742
error_t ret_errno = 0;
2226
1743
if(not get_flags(interface, &network) and debug){
2227
1744
ret_errno = errno;
2228
1745
fprintf_plus(stderr, "Failed to get flags for interface "
2229
1746
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
1747
return ret_errno;
2232
1748
}
2233
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
1750
2235
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
1752
if(sd < 0){
2237
1753
ret_errno = errno;
2238
1754
perror_plus("socket");
2239
1755
errno = old_errno;
2245
1761
interface);
2246
1762
}
2247
1763
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
1764
/* Raise priviliges */
1765
raise_privileges();
2254
1766
2255
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
1768
ret_errno = errno;
2257
1769
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
1770
/* Lower privileges */
1771
lower_privileges();
2267
1772
2268
1773
/* Close the socket */
2269
int ret = close(sd);
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1775
if(ret == -1){
2271
1776
perror_plus("close");
2272
1777
}
2273
1778
2274
1779
if(ret_setflags == -1){
2275
errno = ioctl_errno;
1780
errno = ret_errno;
2276
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
1782
errno = old_errno;
2278
return ioctl_errno;
1783
return ret_errno;
2279
1784
}
2280
1785
} else if(debug){
2281
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2287
1792
}
2288
1793
2289
1794
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
2295
1799
AvahiSServiceBrowser *sb = NULL;
2296
1800
error_t ret_errno;
2297
1801
int ret;
2300
1804
int exitcode = EXIT_SUCCESS;
2301
1805
char *interfaces_to_take_down = NULL;
2302
1806
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2306
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1810
const char *seckey = PATHDIR "/" SECKEY;
2308
1811
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
1812
char *interfaces_hooks = NULL;
2311
1813
2312
1814
bool gnutls_initialized = false;
2365
1867
.doc = "Bit length of the prime number used in the"
2366
1868
" Diffie-Hellman key exchange",
2367
1869
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1870
{ .name = "priority", .key = 130,
2374
1871
.arg = "STRING",
2375
1872
.doc = "GnuTLS priority string for the TLS handshake",
2430
1927
}
2431
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1929
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1930
case 130: /* --priority */
2437
1931
mc.priority = arg;
2438
1932
break;
2494
1988
goto end;
2495
1989
}
2496
1990
}
2497
1991
2498
1992
{
2499
1993
/* Work around Debian bug #633582:
2500
1994
<http://bugs.debian.org/633582> */
2501
1995
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
2507
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2508
1998
struct stat st;
2509
1999
2510
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2524
2014
}
2525
2015
}
2526
2016
}
2527
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
2018
}
2529
2019
}
2530
2020
2531
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2533
2023
if(pubkey_fd == -1){
2545
2035
}
2546
2036
}
2547
2037
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2574
2042
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2043
lower_privileges();
2580
2044
}
2581
2045
}
2582
2046
2608
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
2074
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2613
2079
}
2614
2080
2615
2081
if(not debug){
2693
2159
2694
2160
/* If no interfaces were specified, make a list */
2695
2161
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2162
struct dirent **direntries;
2697
2163
/* Look for any good interfaces */
2698
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2699
2165
alphasort);
2705
2171
if(ret_errno != 0){
2706
2172
errno = ret_errno;
2707
2173
perror_plus("argz_add");
2708
free(direntries[i]);
2709
2174
continue;
2710
2175
}
2711
2176
if(debug){
2712
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
2178
direntries[i]->d_name);
2714
2179
}
2715
free(direntries[i]);
2716
2180
}
2717
2181
free(direntries);
2718
2182
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2183
free(direntries);
2722
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2723
2185
exitcode = EXIT_FAILURE;
2724
2186
goto end;
2747
2209
break;
2748
2210
}
2749
2211
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2212
ret = bring_up_interface(interface, delay);
2751
2213
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2755
2217
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2760
2223
perror_plus("argz_add");
2761
2224
}
2762
2225
}
2780
2243
goto end;
2781
2244
}
2782
2245
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2784
2247
if(ret == -1){
2785
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
2249
exitcode = EX_UNAVAILABLE;
2793
2256
goto end;
2794
2257
}
2795
2258
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2259
if(mkdtemp(tempdir) == NULL){
2806
2260
perror_plus("mkdtemp");
2807
2261
goto end;
2808
2262
}
2263
tempdir_created = true;
2809
2264
2810
2265
if(quit_now){
2811
2266
goto end;
2886
2341
sleep((unsigned int)retry_interval);
2887
2342
}
2888
2343
2889
if(not quit_now){
2344
if (not quit_now){
2890
2345
exitcode = EXIT_SUCCESS;
2891
2346
}
2892
2347
2947
2402
if(debug){
2948
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
2404
}
2950
2405
2951
2406
ret = avahi_loop_with_timeout(simple_poll,
2952
2407
(int)(retry_interval * 1000), &mc);
2953
2408
if(debug){
2989
2444
mc.current_server->prev->next = NULL;
2990
2445
while(mc.current_server != NULL){
2991
2446
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
3000
2447
free(mc.current_server);
3001
2448
mc.current_server = next;
3002
2449
}
3003
2450
}
3004
2451
3005
/* Re-raise privileges */
2452
/* Re-raise priviliges */
3006
2453
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
3034
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
3040
}
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2470
}
2471
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2475
}
2476
}
2477
2478
lower_privileges_permanently();
3041
2479
}
3042
2480
3043
2481
free(interfaces_to_take_down);
3044
2482
free(interfaces_hooks);
3045
2483
3046
2484
/* Removes the GPGME temp directory and all files inside */
3047
if(tempdir != NULL){
2485
if(tempdir_created){
3048
2486
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if (numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
2493
char *fullname = NULL;
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
direntry->d_name);
2496
if(ret < 0){
2497
perror_plus("asprintf");
2498
continue;
2499
}
2500
ret = remove(fullname);
2501
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2504
}
2505
free(fullname);
3088
2506
}
3089
close(tempdir_fd);
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if (numentries == -1){
2512
perror_plus("scandir");
2513
}
2514
ret = rmdir(tempdir);
2515
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
3090
2517
}
3091
2518
}
3092
2519
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0