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- Committer: Teddy Hogeborn
- Date: 2017-08-20 14:41:20 UTC
- Revision ID: teddy@recompile.se-20170820144120-ee0hsyhvo1geg8ms
Handle multiple lines better in cryptroot file.
* initramfs-tools-script: Avoid running plugin-runner more than once
if the root file system device is specially marked in the cryptroot
file. Also never run plugin-runner for a resume (usually swap)
device.
* initramfs-tools-script: Avoid running plugin-runner more than once
if the root file system device is specially marked in the cryptroot
file. Also never run plugin-runner for a resume (usually swap)
device.
- 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 © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
59
inet_pton(), connect(),
59
60
getnameinfo() */
60
#include <fcntl.h> /* open() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
63
*/
63
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
65
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
77
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
141
147
static const char sys_class_net[] = "/sys/class/net";
142
148
char *connect_to = NULL;
143
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
144
151
uid_t uid = 65534;
145
152
gid_t gid = 65534;
146
153
183
190
perror(print_text);
184
191
}
185
192
186
__attribute__((format (gnu_printf, 2, 3)))
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
194
int fprintf_plus(FILE *stream, const char *format, ...){
188
195
va_list ap;
189
196
va_start (ap, format);
198
205
* bytes. "buffer_capacity" is how much is currently allocated,
199
206
* "buffer_length" is how much is already used.
200
207
*/
208
__attribute__((nonnull, warn_unused_result))
201
209
size_t incbuffer(char **buffer, size_t buffer_length,
202
210
size_t buffer_capacity){
203
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
216
224
}
217
225
218
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
219
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
229
int af, server **current_server){
221
230
int ret;
230
239
.af = af };
231
240
if(new_server->ip == NULL){
232
241
perror_plus("strdup");
242
free(new_server);
233
243
return false;
234
244
}
235
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
246
if(ret == -1){
237
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
238
257
return false;
239
258
}
240
259
/* Special case of first server */
242
261
new_server->next = new_server;
243
262
new_server->prev = new_server;
244
263
*current_server = new_server;
245
/* Place the new server last in the list */
246
264
} else {
265
/* Place the new server last in the list */
247
266
new_server->next = *current_server;
248
267
new_server->prev = (*current_server)->prev;
249
268
new_server->prev->next = new_server;
255
274
/*
256
275
* Initialize GPGME.
257
276
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
260
282
gpgme_error_t rc;
261
283
gpgme_engine_info_t engine_info;
262
284
263
285
/*
264
286
* Helper function to insert pub and seckey to the engine keyring.
265
287
*/
266
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
267
289
int ret;
268
290
int fd;
269
291
gpgme_data_t pgp_data;
288
310
return false;
289
311
}
290
312
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
292
314
if(ret == -1){
293
315
perror_plus("close");
294
316
}
350
372
* Decrypt OpenPGP data.
351
373
* Returns -1 on error
352
374
*/
375
__attribute__((nonnull, warn_unused_result))
353
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
377
size_t crypto_size,
355
378
char **plaintext,
475
498
return plaintext_length;
476
499
}
477
500
478
static const char * safer_gnutls_strerror(int value){
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
479
510
const char *ret = gnutls_strerror(value);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
511
return safe_string(ret);
483
512
}
484
513
485
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
486
516
static void debuggnutls(__attribute__((unused)) int level,
487
517
const char* string){
488
518
fprintf_plus(stderr, "GnuTLS: %s", string);
489
519
}
490
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
491
522
static int init_gnutls_global(const char *pubkeyfilename,
492
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
493
525
mandos_context *mc){
494
526
int ret;
527
unsigned int uret;
495
528
496
529
if(debug){
497
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
498
531
}
499
532
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
533
if(debug){
508
534
/* "Use a log level over 10 to enable all debugging options."
509
535
* - GnuTLS manual
517
543
if(ret != GNUTLS_E_SUCCESS){
518
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
545
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
521
546
return -1;
522
547
}
523
548
548
573
safer_gnutls_strerror(ret));
549
574
goto globalfail;
550
575
}
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
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
558
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
750
560
751
return 0;
562
753
globalfail:
563
754
564
755
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
566
756
gnutls_dh_params_deinit(mc->dh_params);
567
757
return -1;
568
758
}
569
759
760
__attribute__((nonnull, warn_unused_result))
570
761
static int init_gnutls_session(gnutls_session_t *session,
571
762
mandos_context *mc){
572
763
int ret;
619
810
/* ignore client certificate if any. */
620
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
812
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
624
813
return 0;
625
814
}
626
815
628
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
629
818
__attribute__((unused)) const char *txt){}
630
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
631
1038
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
632
1040
static int start_mandos_communication(const char *ip, in_port_t port,
633
1041
AvahiIfIndex if_index,
634
1042
int af, mandos_context *mc){
643
1051
int retval = -1;
644
1052
gnutls_session_t session;
645
1053
int pf; /* Protocol family */
1054
bool route_added = false;
646
1055
647
1056
errno = 0;
648
1057
670
1079
bool match = false;
671
1080
{
672
1081
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
675
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
676
1086
match = true;
677
1087
break;
706
1116
PRIuMAX "\n", ip, (uintmax_t)port);
707
1117
}
708
1118
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
710
1120
if(tcp_sd < 0){
711
1121
int e = errno;
712
1122
perror_plus("socket");
719
1129
goto mandos_end;
720
1130
}
721
1131
722
memset(&to, 0, sizeof(to));
723
1132
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);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
726
1136
} 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);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
729
1140
}
730
1141
if(ret < 0 ){
731
1142
int e = errno;
740
1151
goto mandos_end;
741
1152
}
742
1153
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
1155
if(IN6_IS_ADDR_LINKLOCAL
745
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
1157
if(if_index == AVAHI_IF_UNSPEC){
801
1212
goto mandos_end;
802
1213
}
803
1214
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;
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
823
1270
}
824
1271
825
1272
const char *out = mandos_protocol_version;
979
1426
&decrypted_buffer, mc);
980
1427
if(decrypted_buffer_size >= 0){
981
1428
1429
clearerr(stdout);
982
1430
written = 0;
983
1431
while(written < (size_t) decrypted_buffer_size){
984
1432
if(quit_now){
1000
1448
}
1001
1449
written += (size_t)ret;
1002
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1003
1461
retval = 0;
1004
1462
}
1005
1463
}
1008
1466
1009
1467
mandos_end:
1010
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1011
1475
int e = errno;
1012
1476
free(decrypted_buffer);
1013
1477
free(buffer);
1014
1478
if(tcp_sd >= 0){
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
1016
1480
}
1017
1481
if(ret == -1){
1018
1482
if(e == 0){
1043
1507
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
1508
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
1509
flags,
1046
void* mc){
1510
void *mc){
1047
1511
if(r == NULL){
1048
1512
return;
1049
1513
}
1052
1516
timed out */
1053
1517
1054
1518
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1055
1520
return;
1056
1521
}
1057
1522
1102
1567
const char *domain,
1103
1568
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1569
flags,
1105
void* mc){
1570
void *mc){
1106
1571
if(b == NULL){
1107
1572
return;
1108
1573
}
1168
1633
errno = old_errno;
1169
1634
}
1170
1635
1636
__attribute__((nonnull, warn_unused_result))
1171
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1638
int ret;
1173
error_t ret_errno;
1639
int old_errno;
1174
1640
1175
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1642
if(s < 0){
1177
ret_errno = errno;
1643
old_errno = errno;
1178
1644
perror_plus("socket");
1179
errno = ret_errno;
1645
errno = old_errno;
1180
1646
return false;
1181
1647
}
1182
strcpy(ifr->ifr_name, ifname);
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1183
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1651
if(ret == -1){
1185
1652
if(debug){
1186
ret_errno = errno;
1653
old_errno = errno;
1187
1654
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1655
errno = old_errno;
1189
1656
}
1190
1657
return false;
1191
1658
}
1192
1659
return true;
1193
1660
}
1194
1661
1662
__attribute__((nonnull, warn_unused_result))
1195
1663
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1664
1197
1665
/* Reject the loopback device */
1239
1707
* corresponds to an acceptable network device.
1240
1708
* (This function is passed to scandir(3) as a filter function.)
1241
1709
*/
1710
__attribute__((nonnull, warn_unused_result))
1242
1711
int good_interface(const struct dirent *if_entry){
1243
1712
if(if_entry->d_name[0] == '.'){
1244
1713
return 0;
1262
1731
/*
1263
1732
* This function determines if a network interface is up.
1264
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1265
1735
bool interface_is_up(const char *interface){
1266
1736
struct ifreq ifr;
1267
1737
if(not get_flags(interface, &ifr)){
1278
1748
/*
1279
1749
* This function determines if a network interface is running
1280
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1281
1752
bool interface_is_running(const char *interface){
1282
1753
struct ifreq ifr;
1283
1754
if(not get_flags(interface, &ifr)){
1291
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1292
1763
}
1293
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1294
1766
int notdotentries(const struct dirent *direntry){
1295
1767
/* Skip "." and ".." */
1296
1768
if(direntry->d_name[0] == '.'
1303
1775
}
1304
1776
1305
1777
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1306
1779
int runnable_hook(const struct dirent *direntry){
1307
1780
int ret;
1308
1781
size_t sret;
1316
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
1790
"abcdefghijklmnopqrstuvwxyz"
1318
1791
"0123456789"
1319
"_-");
1792
"_.-");
1320
1793
if((direntry->d_name)[sret] != '\0'){
1321
1794
/* Contains non-allowed characters */
1322
1795
if(debug){
1326
1799
return 0;
1327
1800
}
1328
1801
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);
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1337
1803
if(ret == -1){
1338
1804
if(debug){
1339
1805
perror_plus("Could not stat hook");
1363
1829
return 1;
1364
1830
}
1365
1831
1832
__attribute__((nonnull, warn_unused_result))
1366
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
1834
mandos_context *mc){
1368
1835
int ret;
1436
1903
}
1437
1904
}
1438
1905
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,
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1492
1908
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1496
1927
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");
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1504
1943
}
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){
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1514
1990
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
}
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1573
1995
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
}
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
1585
2064
} 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;
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
1622
2084
}
1623
2085
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;
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
1630
2091
struct ifreq network;
1631
2092
unsigned int if_index = if_nametoindex(interface);
1632
2093
if(if_index == 0){
1641
2102
}
1642
2103
1643
2104
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
1645
2108
ret_errno = errno;
1646
2109
fprintf_plus(stderr, "Failed to get flags for interface "
1647
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
1648
2112
return ret_errno;
1649
2113
}
1650
network.ifr_flags |= IFF_UP;
2114
network.ifr_flags |= IFF_UP; /* set flag */
1651
2115
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
1654
2118
ret_errno = errno;
1655
2119
perror_plus("socket");
1656
2120
errno = old_errno;
1657
2121
return ret_errno;
1658
2122
}
1659
2123
1660
2124
if(quit_now){
1661
close(sd);
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
1662
2129
errno = old_errno;
1663
2130
return EINTR;
1664
2131
}
1668
2135
interface);
1669
2136
}
1670
2137
1671
/* Raise priviliges */
1672
raise_privileges();
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
1673
2144
1674
2145
#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");
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
1682
2157
}
1683
2158
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
1686
2161
#ifdef __linux__
1687
2162
if(restore_loglevel){
1688
2163
ret_linux = klogctl(7, NULL, 0);
1692
2167
}
1693
2168
#endif /* __linux__ */
1694
2169
1695
/* Lower privileges */
1696
lower_privileges();
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
1697
2179
1698
2180
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
ret = close(sd);
1700
2182
if(ret == -1){
1701
2183
perror_plus("close");
1702
2184
}
1703
2185
1704
2186
if(ret_setflags == -1){
1705
errno = ret_errno;
2187
errno = ioctl_errno;
1706
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
2189
errno = old_errno;
1708
return ret_errno;
2190
return ioctl_errno;
1709
2191
}
1710
2192
} else if(debug){
1711
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
2196
1715
2197
/* Sleep checking until interface is running.
1716
2198
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
2199
for(int i = 0; i < delay * 4; i++){
1718
2200
if(interface_is_running(interface)){
1719
2201
break;
1720
2202
}
1729
2211
return 0;
1730
2212
}
1731
2213
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
1734
2217
struct ifreq network;
1735
2218
unsigned int if_index = if_nametoindex(interface);
1736
2219
if(if_index == 0){
1739
2222
return ENXIO;
1740
2223
}
1741
2224
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
1743
2227
if(not get_flags(interface, &network) and debug){
1744
2228
ret_errno = errno;
1745
2229
fprintf_plus(stderr, "Failed to get flags for interface "
1746
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
1747
2232
return ret_errno;
1748
2233
}
1749
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
2235
1751
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
2237
if(sd == -1){
1753
2238
ret_errno = errno;
1754
2239
perror_plus("socket");
1755
2240
errno = old_errno;
1761
2246
interface);
1762
2247
}
1763
2248
1764
/* Raise priviliges */
1765
raise_privileges();
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
1766
2255
1767
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
2257
ioctl_errno = errno;
1769
2258
1770
/* Lower privileges */
1771
lower_privileges();
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
1772
2268
1773
2269
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
int ret = close(sd);
1775
2271
if(ret == -1){
1776
2272
perror_plus("close");
1777
2273
}
1778
2274
1779
2275
if(ret_setflags == -1){
1780
errno = ret_errno;
2276
errno = ioctl_errno;
1781
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
2278
errno = old_errno;
1783
return ret_errno;
2279
return ioctl_errno;
1784
2280
}
1785
2281
} else if(debug){
1786
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1792
2288
}
1793
2289
1794
2290
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 };
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1799
2296
AvahiSServiceBrowser *sb = NULL;
1800
2297
error_t ret_errno;
1801
2298
int ret;
1804
2301
int exitcode = EXIT_SUCCESS;
1805
2302
char *interfaces_to_take_down = NULL;
1806
2303
size_t interfaces_to_take_down_size = 0;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1809
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
2308
const char *seckey = PATHDIR "/" SECKEY;
1811
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
1812
2311
char *interfaces_hooks = NULL;
1813
2312
1814
2313
bool gnutls_initialized = false;
1867
2366
.doc = "Bit length of the prime number used in the"
1868
2367
" Diffie-Hellman key exchange",
1869
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
1870
2374
{ .name = "priority", .key = 130,
1871
2375
.arg = "STRING",
1872
2376
.doc = "GnuTLS priority string for the TLS handshake",
1927
2431
}
1928
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1930
2437
case 130: /* --priority */
1931
2438
mc.priority = arg;
1932
2439
break;
1972
2479
.args_doc = "",
1973
2480
.doc = "Mandos client -- Get and decrypt"
1974
2481
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
1978
2485
case 0:
1979
2486
break;
1980
2487
case ENOMEM:
1981
2488
default:
1982
errno = ret;
2489
errno = ret_errno;
1983
2490
perror_plus("argp_parse");
1984
2491
exitcode = EX_OSERR;
1985
2492
goto end;
1988
2495
goto end;
1989
2496
}
1990
2497
}
1991
2498
1992
2499
{
1993
2500
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
2501
<https://bugs.debian.org/633582> */
1995
2502
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
2508
} else {
1998
2509
struct stat st;
1999
2510
2000
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2014
2525
}
2015
2526
}
2016
2527
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
close(seckey_fd);
2018
2529
}
2019
2530
}
2020
2531
2021
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2023
2534
if(pubkey_fd == -1){
2035
2546
}
2036
2547
}
2037
2548
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2042
2575
/* Lower privileges */
2043
lower_privileges();
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2044
2581
}
2045
2582
}
2046
2583
2072
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
2611
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2079
2614
}
2080
2615
2081
2616
if(not debug){
2159
2694
2160
2695
/* If no interfaces were specified, make a list */
2161
2696
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2697
struct dirent **direntries = NULL;
2163
2698
/* Look for any good interfaces */
2164
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2165
2700
alphasort);
2171
2706
if(ret_errno != 0){
2172
2707
errno = ret_errno;
2173
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2174
2710
continue;
2175
2711
}
2176
2712
if(debug){
2177
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
2714
direntries[i]->d_name);
2179
2715
}
2716
free(direntries[i]);
2180
2717
}
2181
2718
free(direntries);
2182
2719
} else {
2183
free(direntries);
2720
if(ret == 0){
2721
free(direntries);
2722
}
2184
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2185
2724
exitcode = EXIT_FAILURE;
2186
2725
goto end;
2209
2748
break;
2210
2749
}
2211
2750
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2751
errno = bring_up_interface(interface, delay);
2213
2752
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2217
2756
} 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;
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2223
2761
perror_plus("argz_add");
2224
2762
}
2225
2763
}
2243
2781
goto end;
2244
2782
}
2245
2783
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2247
2785
if(ret == -1){
2248
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
2787
exitcode = EX_UNAVAILABLE;
2256
2794
goto end;
2257
2795
}
2258
2796
2259
if(mkdtemp(tempdir) == NULL){
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2260
2807
perror_plus("mkdtemp");
2261
2808
goto end;
2262
2809
}
2263
tempdir_created = true;
2264
2810
2265
2811
if(quit_now){
2266
2812
goto end;
2363
2909
2364
2910
/* Allocate a new server */
2365
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2912
&config, NULL, NULL, &ret);
2367
2913
2368
2914
/* Free the Avahi configuration data */
2369
2915
avahi_server_config_free(&config);
2372
2918
/* Check if creating the Avahi server object succeeded */
2373
2919
if(mc.server == NULL){
2374
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2921
avahi_strerror(ret));
2376
2922
exitcode = EX_UNAVAILABLE;
2377
2923
goto end;
2378
2924
}
2402
2948
if(debug){
2403
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
2950
}
2405
2951
2406
2952
ret = avahi_loop_with_timeout(simple_poll,
2407
2953
(int)(retry_interval * 1000), &mc);
2408
2954
if(debug){
2413
2959
end:
2414
2960
2415
2961
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2417
2969
}
2418
2970
2419
2971
/* Cleanup things */
2430
2982
2431
2983
if(gnutls_initialized){
2432
2984
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2434
2985
gnutls_dh_params_deinit(mc.dh_params);
2435
2986
}
2436
2987
2444
2995
mc.current_server->prev->next = NULL;
2445
2996
while(mc.current_server != NULL){
2446
2997
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
2447
3006
free(mc.current_server);
2448
3007
mc.current_server = next;
2449
3008
}
2450
3009
}
2451
3010
2452
/* Re-raise priviliges */
3011
/* Re-raise privileges */
2453
3012
{
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();
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
3040
}
3041
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
3046
}
2479
3047
}
2480
3048
2481
3049
free(interfaces_to_take_down);
2482
3050
free(interfaces_hooks);
2483
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
2484
3108
/* 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
}
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2518
3111
}
2519
3112
2520
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0