To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 670
- compare with another revision
- download diff
- download tarball
- view history from revision 670
- 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 © 2008-2016 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(1, 2, 4), 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");
526
498
}
527
499
500
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
504
return -1;
505
}
506
528
507
if(debug){
529
508
/* "Use a log level over 10 to enable all debugging options."
530
509
* - GnuTLS manual
538
517
if(ret != GNUTLS_E_SUCCESS){
539
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
541
521
return -1;
542
522
}
543
523
568
548
safer_gnutls_strerror(ret));
569
549
goto globalfail;
570
550
}
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
574
do {
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
576
if(dhpfile == -1){
577
perror_plus("open");
578
dhparamsfilename = NULL;
579
break;
580
}
581
size_t params_capacity = 0;
582
while(true){
583
params_capacity = incbuffer((char **)¶ms.data,
584
(size_t)params.size,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
588
free(params.data);
589
params.data = NULL;
590
dhparamsfilename = NULL;
591
break;
592
}
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
595
BUFFER_SIZE);
596
/* EOF */
597
if(bytes_read == 0){
598
break;
599
}
600
/* check bytes_read for failure */
601
if(bytes_read < 0){
602
perror_plus("read");
603
free(params.data);
604
params.data = NULL;
605
dhparamsfilename = NULL;
606
break;
607
}
608
params.size += (unsigned int)bytes_read;
609
}
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
612
}
613
if(dhparamsfilename == NULL){
614
break;
615
}
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
623
}
624
} while(false);
625
}
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
631
do {
632
int secfile = open(seckeyfilename, O_RDONLY);
633
if(secfile == -1){
634
perror_plus("open");
635
break;
636
}
637
size_t buffer_capacity = 0;
638
while(true){
639
buffer_capacity = incbuffer((char **)&buffer.data,
640
(size_t)buffer.size,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
644
free(buffer.data);
645
buffer.data = NULL;
646
break;
647
}
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
650
BUFFER_SIZE);
651
/* EOF */
652
if(bytes_read == 0){
653
break;
654
}
655
/* check bytes_read for failure */
656
if(bytes_read < 0){
657
perror_plus("read");
658
free(buffer.data);
659
buffer.data = NULL;
660
break;
661
}
662
buffer.size += (unsigned int)bytes_read;
663
}
664
close(secfile);
665
} while(false);
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
669
{
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
674
" structure: %s",
675
safer_gnutls_strerror(ret));
676
free(buffer.data);
677
buffer.data = NULL;
678
} else {
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
684
privkey = NULL;
685
}
686
free(buffer.data);
687
buffer.data = NULL;
688
if(privkey != NULL){
689
/* Use private key to suggest an appropriate
690
sec_param */
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
693
if(debug){
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
697
(sec_param)));
698
}
699
}
700
}
701
}
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
705
if(debug){
706
fprintf_plus(stderr, "Falling back to security parameter"
707
" \"%s\"\n",
708
safe_string(gnutls_sec_param_get_name
709
(sec_param)));
710
}
711
}
712
}
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
714
if(uret != 0){
715
mc->dh_bits = uret;
716
if(debug){
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)),
721
mc->dh_bits);
722
}
723
} else {
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
safer_gnutls_strerror(ret));
729
goto globalfail;
730
}
731
} else if(debug){
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
733
mc->dh_bits);
734
}
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
}
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
743
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
744
559
745
560
return 0;
747
562
globalfail:
748
563
749
564
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
750
566
gnutls_dh_params_deinit(mc->dh_params);
751
567
return -1;
752
568
}
753
569
754
__attribute__((nonnull, warn_unused_result))
755
570
static int init_gnutls_session(gnutls_session_t *session,
756
571
mandos_context *mc){
757
572
int ret;
804
619
/* ignore client certificate if any. */
805
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
806
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
807
624
return 0;
808
625
}
809
626
811
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
812
629
__attribute__((unused)) const char *txt){}
813
630
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
820
ret_errno = errno;
821
}
822
errno = old_errno;
823
return ret_errno;
824
}
825
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
errno = old_errno;
833
return ret_errno;
834
}
835
if(setuid(0) == -1){
836
ret_errno = errno;
837
}
838
errno = old_errno;
839
return ret_errno;
840
}
841
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
848
ret_errno = errno;
849
}
850
errno = old_errno;
851
return ret_errno;
852
}
853
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
860
ret_errno = errno;
861
}
862
errno = old_errno;
863
return ret_errno;
864
}
865
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
869
const char *address,
870
AvahiIfIndex if_index){
871
int ret;
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
878
if(debug){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
881
}
882
return false;
883
}
884
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
888
return false;
889
}
890
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
892
if(devnull == -1){
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
894
return false;
895
}
896
pid_t pid = fork();
897
if(pid == 0){
898
/* Child */
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
901
if(errno != 0){
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
904
} else {
905
/* Set group */
906
errno = 0;
907
ret = setgid(0);
908
if(ret == -1){
909
perror_plus("setgid");
910
_exit(EX_NOPERM);
911
}
912
/* Reset supplementary groups */
913
errno = 0;
914
ret = setgroups(0, NULL);
915
if(ret == -1){
916
perror_plus("setgroups");
917
_exit(EX_NOPERM);
918
}
919
}
920
ret = dup2(devnull, STDIN_FILENO);
921
if(ret == -1){
922
perror_plus("dup2(devnull, STDIN_FILENO)");
923
_exit(EX_OSERR);
924
}
925
ret = close(devnull);
926
if(ret == -1){
927
perror_plus("close");
928
_exit(EX_OSERR);
929
}
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
931
if(ret == -1){
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
933
_exit(EX_OSERR);
934
}
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
936
O_RDONLY
937
| O_DIRECTORY
938
| O_PATH
939
| O_CLOEXEC));
940
if(helperdir_fd == -1){
941
perror_plus("open");
942
_exit(EX_UNAVAILABLE);
943
}
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
945
helper, O_RDONLY));
946
if(helper_fd == -1){
947
perror_plus("openat");
948
close(helperdir_fd);
949
_exit(EX_UNAVAILABLE);
950
}
951
close(helperdir_fd);
952
#ifdef __GNUC__
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
955
#endif
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
959
environ) == -1){
960
#ifdef __GNUC__
961
#pragma GCC diagnostic pop
962
#endif
963
perror_plus("fexecve");
964
_exit(EXIT_FAILURE);
965
}
966
}
967
if(pid == -1){
968
perror_plus("fork");
969
return false;
970
}
971
int status;
972
pid_t pret = -1;
973
errno = 0;
974
do {
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
982
}
983
if(kill(pid, SIGTERM) == -1){
984
perror_plus("kill");
985
}
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
988
" helper program");
989
}
990
return false;
991
}
992
} while(pret == -1 and errno == EINTR);
993
if(pret == -1){
994
perror_plus("waitpid");
995
return false;
996
}
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1001
return false;
1002
}
1003
return true;
1004
}
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1008
return false;
1009
}
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1011
return false;
1012
}
1013
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1017
if(debug){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1019
}
1020
return add_delete_local_route(true, address, if_index);
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1028
}
1029
return add_delete_local_route(false, address, if_index);
1030
}
1031
1032
631
/* Called when a Mandos server is found */
1033
__attribute__((nonnull, warn_unused_result))
1034
632
static int start_mandos_communication(const char *ip, in_port_t port,
1035
633
AvahiIfIndex if_index,
1036
634
int af, mandos_context *mc){
1045
643
int retval = -1;
1046
644
gnutls_session_t session;
1047
645
int pf; /* Protocol family */
1048
bool route_added = false;
1049
646
1050
647
errno = 0;
1051
648
1109
706
PRIuMAX "\n", ip, (uintmax_t)port);
1110
707
}
1111
708
1112
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1113
710
if(tcp_sd < 0){
1114
711
int e = errno;
1115
712
perror_plus("socket");
1122
719
goto mandos_end;
1123
720
}
1124
721
722
memset(&to, 0, sizeof(to));
1125
723
if(af == AF_INET6){
1126
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1127
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1128
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);
1129
726
} else { /* IPv4 */
1130
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1131
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1132
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);
1133
729
}
1134
730
if(ret < 0 ){
1135
731
int e = errno;
1144
740
goto mandos_end;
1145
741
}
1146
742
if(af == AF_INET6){
1147
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1148
744
if(IN6_IS_ADDR_LINKLOCAL
1149
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1150
746
if(if_index == AVAHI_IF_UNSPEC){
1205
801
goto mandos_end;
1206
802
}
1207
803
1208
while(true){
1209
if(af == AF_INET6){
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1212
} else {
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1215
}
1216
if(ret < 0){
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1223
&to)->sin6_addr)))
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1234
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1238
*/
1239
if(debug){
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1241
" direct route\n");
1242
}
1243
int e = errno;
1244
route_added = add_local_route(ip, if_index);
1245
if(route_added){
1246
continue;
1247
}
1248
errno = e;
1249
}
1250
if(errno != ECONNREFUSED or debug){
1251
int e = errno;
1252
perror_plus("connect");
1253
errno = e;
1254
}
1255
goto mandos_end;
1256
}
1257
1258
if(quit_now){
1259
errno = EINTR;
1260
goto mandos_end;
1261
}
1262
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;
1263
823
}
1264
824
1265
825
const char *out = mandos_protocol_version;
1448
1008
1449
1009
mandos_end:
1450
1010
{
1451
if(route_added){
1452
if(not delete_local_route(ip, if_index)){
1453
fprintf_plus(stderr, "Failed to delete local route to %s on"
1454
" interface %d", ip, if_index);
1455
}
1456
}
1457
1011
int e = errno;
1458
1012
free(decrypted_buffer);
1459
1013
free(buffer);
1460
1014
if(tcp_sd >= 0){
1461
ret = close(tcp_sd);
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1462
1016
}
1463
1017
if(ret == -1){
1464
1018
if(e == 0){
1476
1030
return retval;
1477
1031
}
1478
1032
1479
__attribute__((nonnull))
1480
1033
static void resolve_callback(AvahiSServiceResolver *r,
1481
1034
AvahiIfIndex interface,
1482
1035
AvahiProtocol proto,
1490
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1491
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1492
1045
flags,
1493
void *mc){
1046
void* mc){
1494
1047
if(r == NULL){
1495
1048
return;
1496
1049
}
1499
1052
timed out */
1500
1053
1501
1054
if(quit_now){
1502
avahi_s_service_resolver_free(r);
1503
1055
return;
1504
1056
}
1505
1057
1550
1102
const char *domain,
1551
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1552
1104
flags,
1553
void *mc){
1105
void* mc){
1554
1106
if(b == NULL){
1555
1107
return;
1556
1108
}
1616
1168
errno = old_errno;
1617
1169
}
1618
1170
1619
__attribute__((nonnull, warn_unused_result))
1620
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1621
1172
int ret;
1622
1173
error_t ret_errno;
1628
1179
errno = ret_errno;
1629
1180
return false;
1630
1181
}
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1182
strcpy(ifr->ifr_name, ifname);
1633
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1634
1184
if(ret == -1){
1635
1185
if(debug){
1642
1192
return true;
1643
1193
}
1644
1194
1645
__attribute__((nonnull, warn_unused_result))
1646
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1647
1196
1648
1197
/* Reject the loopback device */
1690
1239
* corresponds to an acceptable network device.
1691
1240
* (This function is passed to scandir(3) as a filter function.)
1692
1241
*/
1693
__attribute__((nonnull, warn_unused_result))
1694
1242
int good_interface(const struct dirent *if_entry){
1695
1243
if(if_entry->d_name[0] == '.'){
1696
1244
return 0;
1714
1262
/*
1715
1263
* This function determines if a network interface is up.
1716
1264
*/
1717
__attribute__((nonnull, warn_unused_result))
1718
1265
bool interface_is_up(const char *interface){
1719
1266
struct ifreq ifr;
1720
1267
if(not get_flags(interface, &ifr)){
1731
1278
/*
1732
1279
* This function determines if a network interface is running
1733
1280
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
1281
bool interface_is_running(const char *interface){
1736
1282
struct ifreq ifr;
1737
1283
if(not get_flags(interface, &ifr)){
1745
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1746
1292
}
1747
1293
1748
__attribute__((nonnull, pure, warn_unused_result))
1749
1294
int notdotentries(const struct dirent *direntry){
1750
1295
/* Skip "." and ".." */
1751
1296
if(direntry->d_name[0] == '.'
1758
1303
}
1759
1304
1760
1305
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1762
1306
int runnable_hook(const struct dirent *direntry){
1763
1307
int ret;
1764
1308
size_t sret;
1772
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1773
1317
"abcdefghijklmnopqrstuvwxyz"
1774
1318
"0123456789"
1775
"_.-");
1319
"_-");
1776
1320
if((direntry->d_name)[sret] != '\0'){
1777
1321
/* Contains non-allowed characters */
1778
1322
if(debug){
1782
1326
return 0;
1783
1327
}
1784
1328
1785
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);
1786
1337
if(ret == -1){
1787
1338
if(debug){
1788
1339
perror_plus("Could not stat hook");
1812
1363
return 1;
1813
1364
}
1814
1365
1815
__attribute__((nonnull, warn_unused_result))
1816
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
1367
mandos_context *mc){
1818
1368
int ret;
1822
1372
1823
1373
while(true){
1824
1374
if(mc->current_server == NULL){
1825
if(debug){
1375
if (debug){
1826
1376
fprintf_plus(stderr, "Wait until first server is found."
1827
1377
" No timeout!\n");
1828
1378
}
1829
1379
ret = avahi_simple_poll_iterate(s, -1);
1830
1380
} else {
1831
if(debug){
1381
if (debug){
1832
1382
fprintf_plus(stderr, "Check current_server if we should run"
1833
1383
" it, or wait\n");
1834
1384
}
1851
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1852
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1853
1403
1854
if(debug){
1404
if (debug){
1855
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1856
1406
block_time);
1857
1407
}
1879
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1880
1430
}
1881
1431
if(ret != 0){
1882
if(ret > 0 or errno != EINTR){
1432
if (ret > 0 or errno != EINTR){
1883
1433
return (ret != 1) ? ret : 0;
1884
1434
}
1885
1435
}
1886
1436
}
1887
1437
}
1888
1438
1889
__attribute__((nonnull))
1890
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,
1891
1492
const float delay){
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1895
| O_CLOEXEC);
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1898
if(debug){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1901
}
1902
} else {
1903
perror_plus("open");
1904
}
1905
return;
1906
}
1907
}
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1910
1496
if(numhooks == -1){
1911
perror_plus("scandir");
1912
return;
1913
}
1914
struct dirent *direntry;
1915
int ret;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1917
if(devnull == -1){
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1919
return;
1920
}
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1923
if(debug){
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1925
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");
1926
1504
}
1927
pid_t hook_pid = fork();
1928
if(hook_pid == 0){
1929
/* Child */
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1932
if(errno != 0){
1933
perror_plus("Failed to raise privileges");
1934
_exit(EX_NOPERM);
1935
}
1936
/* Set group */
1937
errno = 0;
1938
ret = setgid(0);
1939
if(ret == -1){
1940
perror_plus("setgid");
1941
_exit(EX_NOPERM);
1942
}
1943
/* Reset supplementary groups */
1944
errno = 0;
1945
ret = setgroups(0, NULL);
1946
if(ret == -1){
1947
perror_plus("setgroups");
1948
_exit(EX_NOPERM);
1949
}
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1951
if(ret == -1){
1952
perror_plus("setenv");
1953
_exit(EX_OSERR);
1954
}
1955
ret = setenv("DEVICE", interface, 1);
1956
if(ret == -1){
1957
perror_plus("setenv");
1958
_exit(EX_OSERR);
1959
}
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1961
if(ret == -1){
1962
perror_plus("setenv");
1963
_exit(EX_OSERR);
1964
}
1965
ret = setenv("MODE", mode, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
char *delaystring;
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1972
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){
1973
1514
perror_plus("asprintf");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("DELAY", delaystring, 1);
1977
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
}
1978
1573
free(delaystring);
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
free(delaystring);
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
}
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1991
direntry->d_name,
1992
O_RDONLY));
1993
if(hook_fd == -1){
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1996
}
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2000
}
2001
ret = dup2(devnull, STDIN_FILENO);
2002
if(ret == -1){
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2004
_exit(EX_OSERR);
2005
}
2006
ret = close(devnull);
2007
if(ret == -1){
2008
perror_plus("close");
2009
_exit(EX_OSERR);
2010
}
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2012
if(ret == -1){
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2014
_exit(EX_OSERR);
2015
}
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2017
environ) == -1){
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2020
}
2021
} else {
2022
if(hook_pid == -1){
2023
perror_plus("fork");
2024
free(direntry);
2025
continue;
2026
}
2027
int status;
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2030
free(direntry);
2031
continue;
2032
}
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2038
free(direntry);
2039
continue;
2040
}
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2044
WTERMSIG(status));
2045
free(direntry);
2046
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
}
2047
1585
} else {
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2050
free(direntry);
2051
continue;
2052
}
2053
}
2054
if(debug){
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2056
direntry->d_name);
2057
}
2058
free(direntry);
2059
}
2060
free(direntries);
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2063
} else {
2064
hookdir_fd = -1;
2065
}
2066
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;
2067
1622
}
2068
1623
2069
__attribute__((nonnull, warn_unused_result))
2070
1624
error_t bring_up_interface(const char *const interface,
2071
1625
const float delay){
1626
int sd = -1;
2072
1627
error_t old_errno = errno;
2073
int ret;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2074
1630
struct ifreq network;
2075
1631
unsigned int if_index = if_nametoindex(interface);
2076
1632
if(if_index == 0){
2085
1641
}
2086
1642
2087
1643
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
1644
if(not get_flags(interface, &network) and debug){
2090
1645
ret_errno = errno;
2091
1646
fprintf_plus(stderr, "Failed to get flags for interface "
2092
1647
"\"%s\"\n", interface);
2093
errno = old_errno;
2094
1648
return ret_errno;
2095
1649
}
2096
network.ifr_flags |= IFF_UP; /* set flag */
1650
network.ifr_flags |= IFF_UP;
2097
1651
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2099
if(sd == -1){
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2100
1654
ret_errno = errno;
2101
1655
perror_plus("socket");
2102
1656
errno = old_errno;
2103
1657
return ret_errno;
2104
1658
}
2105
1659
2106
1660
if(quit_now){
2107
ret = close(sd);
2108
if(ret == -1){
2109
perror_plus("close");
2110
}
1661
close(sd);
2111
1662
errno = old_errno;
2112
1663
return EINTR;
2113
1664
}
2117
1668
interface);
2118
1669
}
2119
1670
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2122
if(ret_errno != 0){
2123
errno = ret_errno;
2124
perror_plus("Failed to raise privileges");
2125
}
1671
/* Raise priviliges */
1672
raise_privileges();
2126
1673
2127
1674
#ifdef __linux__
2128
int ret_linux;
2129
bool restore_loglevel = false;
2130
if(ret_errno == 0){
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2136
} else {
2137
restore_loglevel = true;
2138
}
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");
2139
1682
}
2140
1683
#endif /* __linux__ */
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2143
1686
#ifdef __linux__
2144
1687
if(restore_loglevel){
2145
1688
ret_linux = klogctl(7, NULL, 0);
2149
1692
}
2150
1693
#endif /* __linux__ */
2151
1694
2152
/* If raise_privileges() succeeded above */
2153
if(ret_errno == 0){
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to lower privileges");
2159
}
2160
}
1695
/* Lower privileges */
1696
lower_privileges();
2161
1697
2162
1698
/* Close the socket */
2163
ret = close(sd);
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2164
1700
if(ret == -1){
2165
1701
perror_plus("close");
2166
1702
}
2167
1703
2168
1704
if(ret_setflags == -1){
2169
errno = ioctl_errno;
1705
errno = ret_errno;
2170
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2171
1707
errno = old_errno;
2172
return ioctl_errno;
1708
return ret_errno;
2173
1709
}
2174
1710
} else if(debug){
2175
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
1729
return 0;
2194
1730
}
2195
1731
2196
__attribute__((nonnull, warn_unused_result))
2197
1732
error_t take_down_interface(const char *const interface){
2198
1733
error_t old_errno = errno;
2199
1734
struct ifreq network;
2204
1739
return ENXIO;
2205
1740
}
2206
1741
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
1742
error_t ret_errno = 0;
2208
1743
if(not get_flags(interface, &network) and debug){
2209
1744
ret_errno = errno;
2210
1745
fprintf_plus(stderr, "Failed to get flags for interface "
2211
1746
"\"%s\"\n", interface);
2212
errno = old_errno;
2213
1747
return ret_errno;
2214
1748
}
2215
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2216
1750
2217
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2218
if(sd == -1){
1752
if(sd < 0){
2219
1753
ret_errno = errno;
2220
1754
perror_plus("socket");
2221
1755
errno = old_errno;
2227
1761
interface);
2228
1762
}
2229
1763
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2232
if(ret_errno != 0){
2233
errno = ret_errno;
2234
perror_plus("Failed to raise privileges");
2235
}
1764
/* Raise priviliges */
1765
raise_privileges();
2236
1766
2237
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
1768
ret_errno = errno;
2239
1769
2240
/* If raise_privileges() succeeded above */
2241
if(ret_errno == 0){
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("Failed to lower privileges");
2247
}
2248
}
1770
/* Lower privileges */
1771
lower_privileges();
2249
1772
2250
1773
/* Close the socket */
2251
int ret = close(sd);
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
1775
if(ret == -1){
2253
1776
perror_plus("close");
2254
1777
}
2255
1778
2256
1779
if(ret_setflags == -1){
2257
errno = ioctl_errno;
1780
errno = ret_errno;
2258
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
1782
errno = old_errno;
2260
return ioctl_errno;
1783
return ret_errno;
2261
1784
}
2262
1785
} else if(debug){
2263
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2269
1792
}
2270
1793
2271
1794
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.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 };
2277
1799
AvahiSServiceBrowser *sb = NULL;
2278
1800
error_t ret_errno;
2279
1801
int ret;
2282
1804
int exitcode = EXIT_SUCCESS;
2283
1805
char *interfaces_to_take_down = NULL;
2284
1806
size_t interfaces_to_take_down_size = 0;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2288
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2289
1810
const char *seckey = PATHDIR "/" SECKEY;
2290
1811
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
2292
1812
char *interfaces_hooks = NULL;
2293
1813
2294
1814
bool gnutls_initialized = false;
2347
1867
.doc = "Bit length of the prime number used in the"
2348
1868
" Diffie-Hellman key exchange",
2349
1869
.group = 2 },
2350
{ .name = "dh-params", .key = 134,
2351
.arg = "FILE",
2352
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2353
" for the Diffie-Hellman key exchange",
2354
.group = 2 },
2355
1870
{ .name = "priority", .key = 130,
2356
1871
.arg = "STRING",
2357
1872
.doc = "GnuTLS priority string for the TLS handshake",
2412
1927
}
2413
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2414
1929
break;
2415
case 134: /* --dh-params */
2416
dh_params_file = arg;
2417
break;
2418
1930
case 130: /* --priority */
2419
1931
mc.priority = arg;
2420
1932
break;
2476
1988
goto end;
2477
1989
}
2478
1990
}
2479
1991
2480
1992
{
2481
1993
/* Work around Debian bug #633582:
2482
1994
<http://bugs.debian.org/633582> */
2483
1995
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2488
perror_plus("Failed to raise privileges");
2489
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2490
1998
struct stat st;
2491
1999
2492
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2506
2014
}
2507
2015
}
2508
2016
}
2509
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2510
2018
}
2511
2019
}
2512
2020
2513
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2514
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2515
2023
if(pubkey_fd == -1){
2527
2035
}
2528
2036
}
2529
2037
}
2530
close(pubkey_fd);
2531
}
2532
}
2533
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2539
} else {
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2541
if(ret == -1){
2542
perror_plus("fstat");
2543
} else {
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2547
if(ret == -1){
2548
perror_plus("fchown");
2549
}
2550
}
2551
}
2552
close(dhparams_fd);
2553
}
2554
}
2555
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2556
2042
/* Lower privileges */
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2560
perror_plus("Failed to lower privileges");
2561
}
2043
lower_privileges();
2562
2044
}
2563
2045
}
2564
2046
2590
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2592
2074
}
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2595
2079
}
2596
2080
2597
2081
if(not debug){
2675
2159
2676
2160
/* If no interfaces were specified, make a list */
2677
2161
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2162
struct dirent **direntries;
2679
2163
/* Look for any good interfaces */
2680
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2681
2165
alphasort);
2687
2171
if(ret_errno != 0){
2688
2172
errno = ret_errno;
2689
2173
perror_plus("argz_add");
2690
free(direntries[i]);
2691
2174
continue;
2692
2175
}
2693
2176
if(debug){
2694
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2695
2178
direntries[i]->d_name);
2696
2179
}
2697
free(direntries[i]);
2698
2180
}
2699
2181
free(direntries);
2700
2182
} else {
2701
if(ret == 0){
2702
free(direntries);
2703
}
2183
free(direntries);
2704
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2705
2185
exitcode = EXIT_FAILURE;
2706
2186
goto end;
2729
2209
break;
2730
2210
}
2731
2211
bool interface_was_up = interface_is_up(interface);
2732
errno = bring_up_interface(interface, delay);
2212
ret = bring_up_interface(interface, delay);
2733
2213
if(not interface_was_up){
2734
if(errno != 0){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2737
2217
} else {
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2740
interface);
2741
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;
2742
2223
perror_plus("argz_add");
2743
2224
}
2744
2225
}
2762
2243
goto end;
2763
2244
}
2764
2245
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2766
2247
if(ret == -1){
2767
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2768
2249
exitcode = EX_UNAVAILABLE;
2775
2256
goto end;
2776
2257
}
2777
2258
2778
/* Try /run/tmp before /tmp */
2779
tempdir = mkdtemp(run_tempdir);
2780
if(tempdir == NULL and errno == ENOENT){
2781
if(debug){
2782
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2783
run_tempdir, old_tempdir);
2784
}
2785
tempdir = mkdtemp(old_tempdir);
2786
}
2787
if(tempdir == NULL){
2259
if(mkdtemp(tempdir) == NULL){
2788
2260
perror_plus("mkdtemp");
2789
2261
goto end;
2790
2262
}
2263
tempdir_created = true;
2791
2264
2792
2265
if(quit_now){
2793
2266
goto end;
2868
2341
sleep((unsigned int)retry_interval);
2869
2342
}
2870
2343
2871
if(not quit_now){
2344
if (not quit_now){
2872
2345
exitcode = EXIT_SUCCESS;
2873
2346
}
2874
2347
2929
2402
if(debug){
2930
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2931
2404
}
2932
2405
2933
2406
ret = avahi_loop_with_timeout(simple_poll,
2934
2407
(int)(retry_interval * 1000), &mc);
2935
2408
if(debug){
2957
2430
2958
2431
if(gnutls_initialized){
2959
2432
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2960
2434
gnutls_dh_params_deinit(mc.dh_params);
2961
2435
}
2962
2436
2970
2444
mc.current_server->prev->next = NULL;
2971
2445
while(mc.current_server != NULL){
2972
2446
server *next = mc.current_server->next;
2973
#ifdef __GNUC__
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2976
#endif
2977
free((char *)(mc.current_server->ip));
2978
#ifdef __GNUC__
2979
#pragma GCC diagnostic pop
2980
#endif
2981
2447
free(mc.current_server);
2982
2448
mc.current_server = next;
2983
2449
}
2984
2450
}
2985
2451
2986
/* Re-raise privileges */
2452
/* Re-raise priviliges */
2987
2453
{
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2991
perror_plus("Failed to raise privileges");
2992
} else {
2993
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2997
2998
/* Take down the network interfaces which were brought up */
2999
{
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3003
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to take down interface");
3008
}
3009
}
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
3012
" down\n");
3013
}
3014
}
3015
}
3016
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3020
perror_plus("Failed to lower privileges permanently");
3021
}
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();
3022
2479
}
3023
2480
3024
2481
free(interfaces_to_take_down);
3025
2482
free(interfaces_hooks);
3026
2483
3027
2484
/* Removes the GPGME temp directory and all files inside */
3028
if(tempdir != NULL){
2485
if(tempdir_created){
3029
2486
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
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);
3059
2506
}
3060
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");
3061
2517
}
3062
2518
}
3063
2519
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0