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- Committer: Teddy Hogeborn
- Date: 2016-06-03 17:18:46 UTC
- Revision ID: teddy@recompile.se-20160603171846-zr11h4gshlkgoona
mandos-keygen: Try to use ECDSA keys with ssh-keyscan(1) by default.
* mandos-keygen (password): Add "ecdsa-sha2-nistp256" first in list of
SSH key types to try to scan for.
* mandos-keygen (password): Add "ecdsa-sha2-nistp256" first in list of
SSH key types to try to scan for.
- files added:
- bugs.xml
- debian/upstream
- plugin-helpers
- files removed:
- debian/upstream-signing-key.pgp
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
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> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
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() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
77
*/
74
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
79
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
77
82
#include <arpa/inet.h> /* inet_pton(), htons() */
78
83
#include <iso646.h> /* not, or, and */
79
84
#include <argp.h> /* struct argp_option, error_t, struct
141
146
static const char sys_class_net[] = "/sys/class/net";
142
147
char *connect_to = NULL;
143
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
144
150
uid_t uid = 65534;
145
151
gid_t gid = 65534;
146
152
183
189
perror(print_text);
184
190
}
185
191
186
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
193
int fprintf_plus(FILE *stream, const char *format, ...){
188
194
va_list ap;
189
195
va_start (ap, format);
198
204
* bytes. "buffer_capacity" is how much is currently allocated,
199
205
* "buffer_length" is how much is already used.
200
206
*/
207
__attribute__((nonnull, warn_unused_result))
201
208
size_t incbuffer(char **buffer, size_t buffer_length,
202
209
size_t buffer_capacity){
203
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
216
223
}
217
224
218
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
219
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
228
int af, server **current_server){
221
229
int ret;
230
238
.af = af };
231
239
if(new_server->ip == NULL){
232
240
perror_plus("strdup");
241
free(new_server);
233
242
return false;
234
243
}
235
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
245
if(ret == -1){
237
246
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);
238
256
return false;
239
257
}
240
258
/* Special case of first server */
242
260
new_server->next = new_server;
243
261
new_server->prev = new_server;
244
262
*current_server = new_server;
245
/* Place the new server last in the list */
246
263
} else {
264
/* Place the new server last in the list */
247
265
new_server->next = *current_server;
248
266
new_server->prev = (*current_server)->prev;
249
267
new_server->prev->next = new_server;
255
273
/*
256
274
* Initialize GPGME.
257
275
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
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){
260
281
gpgme_error_t rc;
261
282
gpgme_engine_info_t engine_info;
262
283
263
284
/*
264
285
* Helper function to insert pub and seckey to the engine keyring.
265
286
*/
266
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
267
288
int ret;
268
289
int fd;
269
290
gpgme_data_t pgp_data;
288
309
return false;
289
310
}
290
311
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
292
313
if(ret == -1){
293
314
perror_plus("close");
294
315
}
350
371
* Decrypt OpenPGP data.
351
372
* Returns -1 on error
352
373
*/
374
__attribute__((nonnull, warn_unused_result))
353
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
376
size_t crypto_size,
355
377
char **plaintext,
475
497
return plaintext_length;
476
498
}
477
499
478
static const char * safer_gnutls_strerror(int value){
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){
479
509
const char *ret = gnutls_strerror(value);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
510
return safe_string(ret);
483
511
}
484
512
485
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
486
515
static void debuggnutls(__attribute__((unused)) int level,
487
516
const char* string){
488
517
fprintf_plus(stderr, "GnuTLS: %s", string);
489
518
}
490
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
491
521
static int init_gnutls_global(const char *pubkeyfilename,
492
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
493
524
mandos_context *mc){
494
525
int ret;
526
unsigned int uret;
495
527
496
528
if(debug){
497
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
498
530
}
499
531
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
507
532
if(debug){
508
533
/* "Use a log level over 10 to enable all debugging options."
509
534
* - GnuTLS manual
517
542
if(ret != GNUTLS_E_SUCCESS){
518
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
544
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
521
545
return -1;
522
546
}
523
547
548
572
safer_gnutls_strerror(ret));
549
573
goto globalfail;
550
574
}
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
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
}
558
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
748
560
749
return 0;
562
751
globalfail:
563
752
564
753
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
566
754
gnutls_dh_params_deinit(mc->dh_params);
567
755
return -1;
568
756
}
569
757
758
__attribute__((nonnull, warn_unused_result))
570
759
static int init_gnutls_session(gnutls_session_t *session,
571
760
mandos_context *mc){
572
761
int ret;
619
808
/* ignore client certificate if any. */
620
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
810
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
624
811
return 0;
625
812
}
626
813
628
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
629
816
__attribute__((unused)) const char *txt){}
630
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
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
631
1036
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
632
1038
static int start_mandos_communication(const char *ip, in_port_t port,
633
1039
AvahiIfIndex if_index,
634
1040
int af, mandos_context *mc){
643
1049
int retval = -1;
644
1050
gnutls_session_t session;
645
1051
int pf; /* Protocol family */
1052
bool route_added = false;
646
1053
647
1054
errno = 0;
648
1055
706
1113
PRIuMAX "\n", ip, (uintmax_t)port);
707
1114
}
708
1115
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
710
1117
if(tcp_sd < 0){
711
1118
int e = errno;
712
1119
perror_plus("socket");
719
1126
goto mandos_end;
720
1127
}
721
1128
722
memset(&to, 0, sizeof(to));
723
1129
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
726
1133
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
729
1137
}
730
1138
if(ret < 0 ){
731
1139
int e = errno;
740
1148
goto mandos_end;
741
1149
}
742
1150
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
1152
if(IN6_IS_ADDR_LINKLOCAL
745
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
1154
if(if_index == AVAHI_IF_UNSPEC){
801
1209
goto mandos_end;
802
1210
}
803
1211
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;
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;
823
1267
}
824
1268
825
1269
const char *out = mandos_protocol_version;
1008
1452
1009
1453
mandos_end:
1010
1454
{
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
}
1011
1461
int e = errno;
1012
1462
free(decrypted_buffer);
1013
1463
free(buffer);
1014
1464
if(tcp_sd >= 0){
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
1016
1466
}
1017
1467
if(ret == -1){
1018
1468
if(e == 0){
1030
1480
return retval;
1031
1481
}
1032
1482
1483
__attribute__((nonnull))
1033
1484
static void resolve_callback(AvahiSServiceResolver *r,
1034
1485
AvahiIfIndex interface,
1035
1486
AvahiProtocol proto,
1043
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
1496
flags,
1046
void* mc){
1497
void *mc){
1047
1498
if(r == NULL){
1048
1499
return;
1049
1500
}
1052
1503
timed out */
1053
1504
1054
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1055
1507
return;
1056
1508
}
1057
1509
1102
1554
const char *domain,
1103
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1556
flags,
1105
void* mc){
1557
void *mc){
1106
1558
if(b == NULL){
1107
1559
return;
1108
1560
}
1168
1620
errno = old_errno;
1169
1621
}
1170
1622
1623
__attribute__((nonnull, warn_unused_result))
1171
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1625
int ret;
1173
error_t ret_errno;
1626
int old_errno;
1174
1627
1175
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1629
if(s < 0){
1177
ret_errno = errno;
1630
old_errno = errno;
1178
1631
perror_plus("socket");
1179
errno = ret_errno;
1632
errno = old_errno;
1180
1633
return false;
1181
1634
}
1182
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1183
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1638
if(ret == -1){
1185
1639
if(debug){
1186
ret_errno = errno;
1640
old_errno = errno;
1187
1641
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1642
errno = old_errno;
1189
1643
}
1190
1644
return false;
1191
1645
}
1192
1646
return true;
1193
1647
}
1194
1648
1649
__attribute__((nonnull, warn_unused_result))
1195
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1651
1197
1652
/* Reject the loopback device */
1239
1694
* corresponds to an acceptable network device.
1240
1695
* (This function is passed to scandir(3) as a filter function.)
1241
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1242
1698
int good_interface(const struct dirent *if_entry){
1243
1699
if(if_entry->d_name[0] == '.'){
1244
1700
return 0;
1262
1718
/*
1263
1719
* This function determines if a network interface is up.
1264
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1265
1722
bool interface_is_up(const char *interface){
1266
1723
struct ifreq ifr;
1267
1724
if(not get_flags(interface, &ifr)){
1278
1735
/*
1279
1736
* This function determines if a network interface is running
1280
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1281
1739
bool interface_is_running(const char *interface){
1282
1740
struct ifreq ifr;
1283
1741
if(not get_flags(interface, &ifr)){
1291
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1292
1750
}
1293
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1294
1753
int notdotentries(const struct dirent *direntry){
1295
1754
/* Skip "." and ".." */
1296
1755
if(direntry->d_name[0] == '.'
1303
1762
}
1304
1763
1305
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1306
1766
int runnable_hook(const struct dirent *direntry){
1307
1767
int ret;
1308
1768
size_t sret;
1316
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
1777
"abcdefghijklmnopqrstuvwxyz"
1318
1778
"0123456789"
1319
"_-");
1779
"_.-");
1320
1780
if((direntry->d_name)[sret] != '\0'){
1321
1781
/* Contains non-allowed characters */
1322
1782
if(debug){
1326
1786
return 0;
1327
1787
}
1328
1788
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);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1337
1790
if(ret == -1){
1338
1791
if(debug){
1339
1792
perror_plus("Could not stat hook");
1363
1816
return 1;
1364
1817
}
1365
1818
1819
__attribute__((nonnull, warn_unused_result))
1366
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
1821
mandos_context *mc){
1368
1822
int ret;
1436
1890
}
1437
1891
}
1438
1892
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,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1492
1895
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
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);
1496
1914
if(numhooks == -1){
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");
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);
1504
1930
}
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){
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){
1514
1977
perror_plus("asprintf");
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
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1573
1982
free(delaystring);
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
}
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;
1585
2051
} else {
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;
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);
1622
2071
}
1623
2072
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2073
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2077
int ret;
1630
2078
struct ifreq network;
1631
2079
unsigned int if_index = if_nametoindex(interface);
1632
2080
if(if_index == 0){
1641
2089
}
1642
2090
1643
2091
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2094
if(not get_flags(interface, &network)){
1645
2095
ret_errno = errno;
1646
2096
fprintf_plus(stderr, "Failed to get flags for interface "
1647
2097
"\"%s\"\n", interface);
2098
errno = old_errno;
1648
2099
return ret_errno;
1649
2100
}
1650
network.ifr_flags |= IFF_UP;
2101
network.ifr_flags |= IFF_UP; /* set flag */
1651
2102
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2103
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2104
if(sd == -1){
1654
2105
ret_errno = errno;
1655
2106
perror_plus("socket");
1656
2107
errno = old_errno;
1657
2108
return ret_errno;
1658
2109
}
1659
2110
1660
2111
if(quit_now){
1661
close(sd);
2112
ret = close(sd);
2113
if(ret == -1){
2114
perror_plus("close");
2115
}
1662
2116
errno = old_errno;
1663
2117
return EINTR;
1664
2118
}
1668
2122
interface);
1669
2123
}
1670
2124
1671
/* Raise priviliges */
1672
raise_privileges();
2125
/* Raise privileges */
2126
ret_errno = raise_privileges();
2127
if(ret_errno != 0){
2128
errno = ret_errno;
2129
perror_plus("Failed to raise privileges");
2130
}
1673
2131
1674
2132
#ifdef __linux__
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");
2133
int ret_linux;
2134
bool restore_loglevel = false;
2135
if(ret_errno == 0){
2136
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2137
messages about the network interface to mess up the prompt */
2138
ret_linux = klogctl(8, NULL, 5);
2139
if(ret_linux == -1){
2140
perror_plus("klogctl");
2141
} else {
2142
restore_loglevel = true;
2143
}
1682
2144
}
1683
2145
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2146
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2147
ioctl_errno = errno;
1686
2148
#ifdef __linux__
1687
2149
if(restore_loglevel){
1688
2150
ret_linux = klogctl(7, NULL, 0);
1692
2154
}
1693
2155
#endif /* __linux__ */
1694
2156
1695
/* Lower privileges */
1696
lower_privileges();
2157
/* If raise_privileges() succeeded above */
2158
if(ret_errno == 0){
2159
/* Lower privileges */
2160
ret_errno = lower_privileges();
2161
if(ret_errno != 0){
2162
errno = ret_errno;
2163
perror_plus("Failed to lower privileges");
2164
}
2165
}
1697
2166
1698
2167
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
ret = close(sd);
1700
2169
if(ret == -1){
1701
2170
perror_plus("close");
1702
2171
}
1703
2172
1704
2173
if(ret_setflags == -1){
1705
errno = ret_errno;
2174
errno = ioctl_errno;
1706
2175
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
2176
errno = old_errno;
1708
return ret_errno;
2177
return ioctl_errno;
1709
2178
}
1710
2179
} else if(debug){
1711
2180
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1729
2198
return 0;
1730
2199
}
1731
2200
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
2201
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
1734
2204
struct ifreq network;
1735
2205
unsigned int if_index = if_nametoindex(interface);
1736
2206
if(if_index == 0){
1739
2209
return ENXIO;
1740
2210
}
1741
2211
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
1743
2214
if(not get_flags(interface, &network) and debug){
1744
2215
ret_errno = errno;
1745
2216
fprintf_plus(stderr, "Failed to get flags for interface "
1746
2217
"\"%s\"\n", interface);
2218
errno = old_errno;
1747
2219
return ret_errno;
1748
2220
}
1749
2221
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
2222
1751
2223
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
2224
if(sd == -1){
1753
2225
ret_errno = errno;
1754
2226
perror_plus("socket");
1755
2227
errno = old_errno;
1761
2233
interface);
1762
2234
}
1763
2235
1764
/* Raise priviliges */
1765
raise_privileges();
2236
/* Raise privileges */
2237
ret_errno = raise_privileges();
2238
if(ret_errno != 0){
2239
errno = ret_errno;
2240
perror_plus("Failed to raise privileges");
2241
}
1766
2242
1767
2243
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
2244
ioctl_errno = errno;
1769
2245
1770
/* Lower privileges */
1771
lower_privileges();
2246
/* If raise_privileges() succeeded above */
2247
if(ret_errno == 0){
2248
/* Lower privileges */
2249
ret_errno = lower_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to lower privileges");
2253
}
2254
}
1772
2255
1773
2256
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
int ret = close(sd);
1775
2258
if(ret == -1){
1776
2259
perror_plus("close");
1777
2260
}
1778
2261
1779
2262
if(ret_setflags == -1){
1780
errno = ret_errno;
2263
errno = ioctl_errno;
1781
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
2265
errno = old_errno;
1783
return ret_errno;
2266
return ioctl_errno;
1784
2267
}
1785
2268
} else if(debug){
1786
2269
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1792
2275
}
1793
2276
1794
2277
int main(int argc, char *argv[]){
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 };
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
1799
2283
AvahiSServiceBrowser *sb = NULL;
1800
2284
error_t ret_errno;
1801
2285
int ret;
1804
2288
int exitcode = EXIT_SUCCESS;
1805
2289
char *interfaces_to_take_down = NULL;
1806
2290
size_t interfaces_to_take_down_size = 0;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2291
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2292
char old_tempdir[] = "/tmp/mandosXXXXXX";
2293
char *tempdir = NULL;
1809
2294
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
2295
const char *seckey = PATHDIR "/" SECKEY;
1811
2296
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
1812
2298
char *interfaces_hooks = NULL;
1813
2299
1814
2300
bool gnutls_initialized = false;
1867
2353
.doc = "Bit length of the prime number used in the"
1868
2354
" Diffie-Hellman key exchange",
1869
2355
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
1870
2361
{ .name = "priority", .key = 130,
1871
2362
.arg = "STRING",
1872
2363
.doc = "GnuTLS priority string for the TLS handshake",
1927
2418
}
1928
2419
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
2420
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
1930
2424
case 130: /* --priority */
1931
2425
mc.priority = arg;
1932
2426
break;
1972
2466
.args_doc = "",
1973
2467
.doc = "Mandos client -- Get and decrypt"
1974
2468
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
1978
2472
case 0:
1979
2473
break;
1980
2474
case ENOMEM:
1981
2475
default:
1982
errno = ret;
2476
errno = ret_errno;
1983
2477
perror_plus("argp_parse");
1984
2478
exitcode = EX_OSERR;
1985
2479
goto end;
1988
2482
goto end;
1989
2483
}
1990
2484
}
1991
2485
1992
2486
{
1993
2487
/* Work around Debian bug #633582:
1994
2488
<http://bugs.debian.org/633582> */
1995
2489
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2490
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2494
perror_plus("Failed to raise privileges");
2495
} else {
1998
2496
struct stat st;
1999
2497
2000
2498
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2014
2512
}
2015
2513
}
2016
2514
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2515
close(seckey_fd);
2018
2516
}
2019
2517
}
2020
2518
2021
2519
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
2520
int pubkey_fd = open(pubkey, O_RDONLY);
2023
2521
if(pubkey_fd == -1){
2035
2533
}
2036
2534
}
2037
2535
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
2042
2562
/* Lower privileges */
2043
lower_privileges();
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2566
perror_plus("Failed to lower privileges");
2567
}
2044
2568
}
2045
2569
}
2046
2570
2072
2596
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
2597
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
2598
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2599
run_network_hooks("start", interfaces_hooks != NULL ?
2600
interfaces_hooks : "", delay);
2079
2601
}
2080
2602
2081
2603
if(not debug){
2159
2681
2160
2682
/* If no interfaces were specified, make a list */
2161
2683
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2684
struct dirent **direntries = NULL;
2163
2685
/* Look for any good interfaces */
2164
2686
ret = scandir(sys_class_net, &direntries, good_interface,
2165
2687
alphasort);
2171
2693
if(ret_errno != 0){
2172
2694
errno = ret_errno;
2173
2695
perror_plus("argz_add");
2696
free(direntries[i]);
2174
2697
continue;
2175
2698
}
2176
2699
if(debug){
2177
2700
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
2701
direntries[i]->d_name);
2179
2702
}
2703
free(direntries[i]);
2180
2704
}
2181
2705
free(direntries);
2182
2706
} else {
2183
free(direntries);
2707
if(ret == 0){
2708
free(direntries);
2709
}
2184
2710
fprintf_plus(stderr, "Could not find a network interface\n");
2185
2711
exitcode = EXIT_FAILURE;
2186
2712
goto end;
2209
2735
break;
2210
2736
}
2211
2737
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2738
errno = bring_up_interface(interface, delay);
2213
2739
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2740
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2217
2743
} else {
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;
2744
errno = argz_add(&interfaces_to_take_down,
2745
&interfaces_to_take_down_size,
2746
interface);
2747
if(errno != 0){
2223
2748
perror_plus("argz_add");
2224
2749
}
2225
2750
}
2243
2768
goto end;
2244
2769
}
2245
2770
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2247
2772
if(ret == -1){
2248
2773
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
2774
exitcode = EX_UNAVAILABLE;
2256
2781
goto end;
2257
2782
}
2258
2783
2259
if(mkdtemp(tempdir) == NULL){
2784
/* Try /run/tmp before /tmp */
2785
tempdir = mkdtemp(run_tempdir);
2786
if(tempdir == NULL and errno == ENOENT){
2787
if(debug){
2788
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2789
run_tempdir, old_tempdir);
2790
}
2791
tempdir = mkdtemp(old_tempdir);
2792
}
2793
if(tempdir == NULL){
2260
2794
perror_plus("mkdtemp");
2261
2795
goto end;
2262
2796
}
2263
tempdir_created = true;
2264
2797
2265
2798
if(quit_now){
2266
2799
goto end;
2363
2896
2364
2897
/* Allocate a new server */
2365
2898
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2899
&config, NULL, NULL, &ret);
2367
2900
2368
2901
/* Free the Avahi configuration data */
2369
2902
avahi_server_config_free(&config);
2372
2905
/* Check if creating the Avahi server object succeeded */
2373
2906
if(mc.server == NULL){
2374
2907
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2908
avahi_strerror(ret));
2376
2909
exitcode = EX_UNAVAILABLE;
2377
2910
goto end;
2378
2911
}
2402
2935
if(debug){
2403
2936
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
2937
}
2405
2938
2406
2939
ret = avahi_loop_with_timeout(simple_poll,
2407
2940
(int)(retry_interval * 1000), &mc);
2408
2941
if(debug){
2430
2963
2431
2964
if(gnutls_initialized){
2432
2965
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2434
2966
gnutls_dh_params_deinit(mc.dh_params);
2435
2967
}
2436
2968
2444
2976
mc.current_server->prev->next = NULL;
2445
2977
while(mc.current_server != NULL){
2446
2978
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2447
2987
free(mc.current_server);
2448
2988
mc.current_server = next;
2449
2989
}
2450
2990
}
2451
2991
2452
/* Re-raise priviliges */
2992
/* Re-raise privileges */
2453
2993
{
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();
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2997
perror_plus("Failed to raise privileges");
2998
} else {
2999
3000
/* Run network hooks */
3001
run_network_hooks("stop", interfaces_hooks != NULL ?
3002
interfaces_hooks : "", delay);
3003
3004
/* Take down the network interfaces which were brought up */
3005
{
3006
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3013
perror_plus("Failed to take down interface");
3014
}
3015
}
3016
if(debug and (interfaces_to_take_down == NULL)){
3017
fprintf_plus(stderr, "No interfaces needed to be taken"
3018
" down\n");
3019
}
3020
}
3021
}
3022
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3026
perror_plus("Failed to lower privileges permanently");
3027
}
2479
3028
}
2480
3029
2481
3030
free(interfaces_to_take_down);
2482
3031
free(interfaces_hooks);
2483
3032
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
2484
3089
/* Removes the GPGME temp directory and all files inside */
2485
if(tempdir_created){
2486
struct dirent **direntries = NULL;
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);
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
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
2518
3092
}
2519
3093
2520
3094
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0