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- Committer: Teddy Hogeborn
- Date: 2014-03-10 10:11:37 UTC
- Revision ID: teddy@recompile.se-20140310101137-3khoc3qrntp13l08
White space fix: change "if (" to "if(" in C code.
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
* plugins.d/mandos-client.c (start_mandos_communication): White space
fix.
(avahi_loop_with_timeout, main): - '' -
- 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(), AT_REMOVEDIR */
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,
64
64
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
70
66
program_invocation_short_name */
71
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
77
73
*/
78
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
75
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
76
setgid(), pause(), _exit() */
82
77
#include <arpa/inet.h> /* inet_pton(), htons() */
83
78
#include <iso646.h> /* not, or, and */
84
79
#include <argp.h> /* struct argp_option, error_t, struct
146
141
static const char sys_class_net[] = "/sys/class/net";
147
142
char *connect_to = NULL;
148
143
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
144
uid_t uid = 65534;
151
145
gid_t gid = 65534;
152
146
189
183
perror(print_text);
190
184
}
191
185
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
193
187
int fprintf_plus(FILE *stream, const char *format, ...){
194
188
va_list ap;
195
189
va_start (ap, format);
204
198
* bytes. "buffer_capacity" is how much is currently allocated,
205
199
* "buffer_length" is how much is already used.
206
200
*/
207
__attribute__((nonnull, warn_unused_result))
208
201
size_t incbuffer(char **buffer, size_t buffer_length,
209
202
size_t buffer_capacity){
210
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
223
216
}
224
217
225
218
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
220
int af, server **current_server){
229
221
int ret;
238
230
.af = af };
239
231
if(new_server->ip == NULL){
240
232
perror_plus("strdup");
241
free(new_server);
242
233
return false;
243
234
}
244
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
236
if(ret == -1){
246
237
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
238
return false;
257
239
}
258
240
/* Special case of first server */
260
242
new_server->next = new_server;
261
243
new_server->prev = new_server;
262
244
*current_server = new_server;
245
/* Place the new server last in the list */
263
246
} else {
264
/* Place the new server last in the list */
265
247
new_server->next = *current_server;
266
248
new_server->prev = (*current_server)->prev;
267
249
new_server->prev->next = new_server;
273
255
/*
274
256
* Initialize GPGME.
275
257
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
281
260
gpgme_error_t rc;
282
261
gpgme_engine_info_t engine_info;
283
262
284
263
/*
285
264
* Helper function to insert pub and seckey to the engine keyring.
286
265
*/
287
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
288
267
int ret;
289
268
int fd;
290
269
gpgme_data_t pgp_data;
309
288
return false;
310
289
}
311
290
312
ret = close(fd);
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
292
if(ret == -1){
314
293
perror_plus("close");
315
294
}
371
350
* Decrypt OpenPGP data.
372
351
* Returns -1 on error
373
352
*/
374
__attribute__((nonnull, warn_unused_result))
375
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
354
size_t crypto_size,
377
355
char **plaintext,
497
475
return plaintext_length;
498
476
}
499
477
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
509
479
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
511
483
}
512
484
513
485
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
486
static void debuggnutls(__attribute__((unused)) int level,
516
487
const char* string){
517
488
fprintf_plus(stderr, "GnuTLS: %s", string);
518
489
}
519
490
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
491
static int init_gnutls_global(const char *pubkeyfilename,
522
492
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
493
mandos_context *mc){
525
494
int ret;
526
unsigned int uret;
527
495
528
496
if(debug){
529
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
498
}
531
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
532
507
if(debug){
533
508
/* "Use a log level over 10 to enable all debugging options."
534
509
* - GnuTLS manual
542
517
if(ret != GNUTLS_E_SUCCESS){
543
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
545
521
return -1;
546
522
}
547
523
572
548
safer_gnutls_strerror(ret));
573
549
goto globalfail;
574
550
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
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
747
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
748
559
749
560
return 0;
751
562
globalfail:
752
563
753
564
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
754
566
gnutls_dh_params_deinit(mc->dh_params);
755
567
return -1;
756
568
}
757
569
758
__attribute__((nonnull, warn_unused_result))
759
570
static int init_gnutls_session(gnutls_session_t *session,
760
571
mandos_context *mc){
761
572
int ret;
808
619
/* ignore client certificate if any. */
809
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
811
624
return 0;
812
625
}
813
626
815
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
629
__attribute__((unused)) const char *txt){}
817
630
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
631
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
632
static int start_mandos_communication(const char *ip, in_port_t port,
1039
633
AvahiIfIndex if_index,
1040
634
int af, mandos_context *mc){
1049
643
int retval = -1;
1050
644
gnutls_session_t session;
1051
645
int pf; /* Protocol family */
1052
bool route_added = false;
1053
646
1054
647
errno = 0;
1055
648
1113
706
PRIuMAX "\n", ip, (uintmax_t)port);
1114
707
}
1115
708
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
710
if(tcp_sd < 0){
1118
711
int e = errno;
1119
712
perror_plus("socket");
1126
719
goto mandos_end;
1127
720
}
1128
721
722
memset(&to, 0, sizeof(to));
1129
723
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
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);
1133
726
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
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);
1137
729
}
1138
730
if(ret < 0 ){
1139
731
int e = errno;
1148
740
goto mandos_end;
1149
741
}
1150
742
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
744
if(IN6_IS_ADDR_LINKLOCAL
1153
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1154
746
if(if_index == AVAHI_IF_UNSPEC){
1209
801
goto mandos_end;
1210
802
}
1211
803
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
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;
1267
823
}
1268
824
1269
825
const char *out = mandos_protocol_version;
1452
1008
1453
1009
mandos_end:
1454
1010
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
1461
1011
int e = errno;
1462
1012
free(decrypted_buffer);
1463
1013
free(buffer);
1464
1014
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
1016
}
1467
1017
if(ret == -1){
1468
1018
if(e == 0){
1480
1030
return retval;
1481
1031
}
1482
1032
1483
__attribute__((nonnull))
1484
1033
static void resolve_callback(AvahiSServiceResolver *r,
1485
1034
AvahiIfIndex interface,
1486
1035
AvahiProtocol proto,
1494
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
1495
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
1045
flags,
1497
void *mc){
1046
void* mc){
1498
1047
if(r == NULL){
1499
1048
return;
1500
1049
}
1503
1052
timed out */
1504
1053
1505
1054
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
1055
return;
1508
1056
}
1509
1057
1554
1102
const char *domain,
1555
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1556
1104
flags,
1557
void *mc){
1105
void* mc){
1558
1106
if(b == NULL){
1559
1107
return;
1560
1108
}
1620
1168
errno = old_errno;
1621
1169
}
1622
1170
1623
__attribute__((nonnull, warn_unused_result))
1624
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
1172
int ret;
1626
1173
error_t ret_errno;
1632
1179
errno = ret_errno;
1633
1180
return false;
1634
1181
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1182
strcpy(ifr->ifr_name, ifname);
1637
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
1184
if(ret == -1){
1639
1185
if(debug){
1646
1192
return true;
1647
1193
}
1648
1194
1649
__attribute__((nonnull, warn_unused_result))
1650
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1651
1196
1652
1197
/* Reject the loopback device */
1694
1239
* corresponds to an acceptable network device.
1695
1240
* (This function is passed to scandir(3) as a filter function.)
1696
1241
*/
1697
__attribute__((nonnull, warn_unused_result))
1698
1242
int good_interface(const struct dirent *if_entry){
1699
1243
if(if_entry->d_name[0] == '.'){
1700
1244
return 0;
1718
1262
/*
1719
1263
* This function determines if a network interface is up.
1720
1264
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
1265
bool interface_is_up(const char *interface){
1723
1266
struct ifreq ifr;
1724
1267
if(not get_flags(interface, &ifr)){
1735
1278
/*
1736
1279
* This function determines if a network interface is running
1737
1280
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1281
bool interface_is_running(const char *interface){
1740
1282
struct ifreq ifr;
1741
1283
if(not get_flags(interface, &ifr)){
1749
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
1292
}
1751
1293
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
1294
int notdotentries(const struct dirent *direntry){
1754
1295
/* Skip "." and ".." */
1755
1296
if(direntry->d_name[0] == '.'
1762
1303
}
1763
1304
1764
1305
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
1306
int runnable_hook(const struct dirent *direntry){
1767
1307
int ret;
1768
1308
size_t sret;
1776
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
1317
"abcdefghijklmnopqrstuvwxyz"
1778
1318
"0123456789"
1779
"_.-");
1319
"_-");
1780
1320
if((direntry->d_name)[sret] != '\0'){
1781
1321
/* Contains non-allowed characters */
1782
1322
if(debug){
1786
1326
return 0;
1787
1327
}
1788
1328
1789
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);
1790
1337
if(ret == -1){
1791
1338
if(debug){
1792
1339
perror_plus("Could not stat hook");
1816
1363
return 1;
1817
1364
}
1818
1365
1819
__attribute__((nonnull, warn_unused_result))
1820
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
1367
mandos_context *mc){
1822
1368
int ret;
1890
1436
}
1891
1437
}
1892
1438
1893
__attribute__((nonnull))
1894
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,
1895
1492
const float delay){
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1914
1496
if(numhooks == -1){
1915
perror_plus("scandir");
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
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");
1930
1504
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
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){
1977
1514
perror_plus("asprintf");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
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
}
1982
1573
free(delaystring);
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
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
}
2051
1585
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
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;
2071
1622
}
2072
1623
2073
__attribute__((nonnull, warn_unused_result))
2074
1624
error_t bring_up_interface(const char *const interface,
2075
1625
const float delay){
1626
int sd = -1;
2076
1627
error_t old_errno = errno;
2077
int ret;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2078
1630
struct ifreq network;
2079
1631
unsigned int if_index = if_nametoindex(interface);
2080
1632
if(if_index == 0){
2089
1641
}
2090
1642
2091
1643
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
1644
if(not get_flags(interface, &network) and debug){
2094
1645
ret_errno = errno;
2095
1646
fprintf_plus(stderr, "Failed to get flags for interface "
2096
1647
"\"%s\"\n", interface);
2097
errno = old_errno;
2098
1648
return ret_errno;
2099
1649
}
2100
network.ifr_flags |= IFF_UP; /* set flag */
1650
network.ifr_flags |= IFF_UP;
2101
1651
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2104
1654
ret_errno = errno;
2105
1655
perror_plus("socket");
2106
1656
errno = old_errno;
2107
1657
return ret_errno;
2108
1658
}
2109
1659
2110
1660
if(quit_now){
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
1661
close(sd);
2115
1662
errno = old_errno;
2116
1663
return EINTR;
2117
1664
}
2121
1668
interface);
2122
1669
}
2123
1670
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
1671
/* Raise priviliges */
1672
raise_privileges();
2130
1673
2131
1674
#ifdef __linux__
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
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");
2143
1682
}
2144
1683
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2147
1686
#ifdef __linux__
2148
1687
if(restore_loglevel){
2149
1688
ret_linux = klogctl(7, NULL, 0);
2153
1692
}
2154
1693
#endif /* __linux__ */
2155
1694
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
1695
/* Lower privileges */
1696
lower_privileges();
2165
1697
2166
1698
/* Close the socket */
2167
ret = close(sd);
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
1700
if(ret == -1){
2169
1701
perror_plus("close");
2170
1702
}
2171
1703
2172
1704
if(ret_setflags == -1){
2173
errno = ioctl_errno;
1705
errno = ret_errno;
2174
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
1707
errno = old_errno;
2176
return ioctl_errno;
1708
return ret_errno;
2177
1709
}
2178
1710
} else if(debug){
2179
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
1729
return 0;
2198
1730
}
2199
1731
2200
__attribute__((nonnull, warn_unused_result))
2201
1732
error_t take_down_interface(const char *const interface){
2202
1733
error_t old_errno = errno;
2203
1734
struct ifreq network;
2208
1739
return ENXIO;
2209
1740
}
2210
1741
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
1742
error_t ret_errno = 0;
2212
1743
if(not get_flags(interface, &network) and debug){
2213
1744
ret_errno = errno;
2214
1745
fprintf_plus(stderr, "Failed to get flags for interface "
2215
1746
"\"%s\"\n", interface);
2216
errno = old_errno;
2217
1747
return ret_errno;
2218
1748
}
2219
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2220
1750
2221
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
1752
if(sd < 0){
2223
1753
ret_errno = errno;
2224
1754
perror_plus("socket");
2225
1755
errno = old_errno;
2231
1761
interface);
2232
1762
}
2233
1763
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
1764
/* Raise priviliges */
1765
raise_privileges();
2240
1766
2241
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
1768
ret_errno = errno;
2243
1769
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
1770
/* Lower privileges */
1771
lower_privileges();
2253
1772
2254
1773
/* Close the socket */
2255
int ret = close(sd);
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
1775
if(ret == -1){
2257
1776
perror_plus("close");
2258
1777
}
2259
1778
2260
1779
if(ret_setflags == -1){
2261
errno = ioctl_errno;
1780
errno = ret_errno;
2262
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
1782
errno = old_errno;
2264
return ioctl_errno;
1783
return ret_errno;
2265
1784
}
2266
1785
} else if(debug){
2267
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2273
1792
}
2274
1793
2275
1794
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.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 };
2281
1799
AvahiSServiceBrowser *sb = NULL;
2282
1800
error_t ret_errno;
2283
1801
int ret;
2286
1804
int exitcode = EXIT_SUCCESS;
2287
1805
char *interfaces_to_take_down = NULL;
2288
1806
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2292
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2293
1810
const char *seckey = PATHDIR "/" SECKEY;
2294
1811
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
1812
char *interfaces_hooks = NULL;
2297
1813
2298
1814
bool gnutls_initialized = false;
2351
1867
.doc = "Bit length of the prime number used in the"
2352
1868
" Diffie-Hellman key exchange",
2353
1869
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
2359
1870
{ .name = "priority", .key = 130,
2360
1871
.arg = "STRING",
2361
1872
.doc = "GnuTLS priority string for the TLS handshake",
2416
1927
}
2417
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2418
1929
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
2422
1930
case 130: /* --priority */
2423
1931
mc.priority = arg;
2424
1932
break;
2480
1988
goto end;
2481
1989
}
2482
1990
}
2483
1991
2484
1992
{
2485
1993
/* Work around Debian bug #633582:
2486
1994
<http://bugs.debian.org/633582> */
2487
1995
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
2493
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2494
1998
struct stat st;
2495
1999
2496
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
2014
}
2511
2015
}
2512
2016
}
2513
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2514
2018
}
2515
2019
}
2516
2020
2517
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2518
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2519
2023
if(pubkey_fd == -1){
2531
2035
}
2532
2036
}
2533
2037
}
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2560
2042
/* Lower privileges */
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2565
}
2043
lower_privileges();
2566
2044
}
2567
2045
}
2568
2046
2594
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
2074
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2599
2079
}
2600
2080
2601
2081
if(not debug){
2679
2159
2680
2160
/* If no interfaces were specified, make a list */
2681
2161
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2162
struct dirent **direntries;
2683
2163
/* Look for any good interfaces */
2684
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2685
2165
alphasort);
2691
2171
if(ret_errno != 0){
2692
2172
errno = ret_errno;
2693
2173
perror_plus("argz_add");
2694
free(direntries[i]);
2695
2174
continue;
2696
2175
}
2697
2176
if(debug){
2698
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
2178
direntries[i]->d_name);
2700
2179
}
2701
free(direntries[i]);
2702
2180
}
2703
2181
free(direntries);
2704
2182
} else {
2705
if(ret == 0){
2706
free(direntries);
2707
}
2183
free(direntries);
2708
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2709
2185
exitcode = EXIT_FAILURE;
2710
2186
goto end;
2733
2209
break;
2734
2210
}
2735
2211
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2212
ret = bring_up_interface(interface, delay);
2737
2213
if(not interface_was_up){
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2741
2217
} else {
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
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;
2746
2223
perror_plus("argz_add");
2747
2224
}
2748
2225
}
2766
2243
goto end;
2767
2244
}
2768
2245
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2770
2247
if(ret == -1){
2771
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2772
2249
exitcode = EX_UNAVAILABLE;
2779
2256
goto end;
2780
2257
}
2781
2258
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
2259
if(mkdtemp(tempdir) == NULL){
2792
2260
perror_plus("mkdtemp");
2793
2261
goto end;
2794
2262
}
2263
tempdir_created = true;
2795
2264
2796
2265
if(quit_now){
2797
2266
goto end;
2933
2402
if(debug){
2934
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2935
2404
}
2936
2405
2937
2406
ret = avahi_loop_with_timeout(simple_poll,
2938
2407
(int)(retry_interval * 1000), &mc);
2939
2408
if(debug){
2961
2430
2962
2431
if(gnutls_initialized){
2963
2432
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2964
2434
gnutls_dh_params_deinit(mc.dh_params);
2965
2435
}
2966
2436
2974
2444
mc.current_server->prev->next = NULL;
2975
2445
while(mc.current_server != NULL){
2976
2446
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2985
2447
free(mc.current_server);
2986
2448
mc.current_server = next;
2987
2449
}
2988
2450
}
2989
2451
2990
/* Re-raise privileges */
2452
/* Re-raise priviliges */
2991
2453
{
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
3019
}
3020
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
3025
}
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();
3026
2479
}
3027
2480
3028
2481
free(interfaces_to_take_down);
3029
2482
free(interfaces_hooks);
3030
2483
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
2484
/* Removes the GPGME temp directory and all files inside */
2485
if(tempdir_created){
3033
2486
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if(numentries > 0){
3046
2491
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
3085
}
3086
3087
/* Removes the GPGME temp directory and all files inside */
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
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);
2506
}
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");
2517
}
3090
2518
}
3091
2519
3092
2520
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0