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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
60
59
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
*/
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
64
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
73
*/
79
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
75
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
76
setgid(), pause(), _exit() */
83
77
#include <arpa/inet.h> /* inet_pton(), htons() */
84
78
#include <iso646.h> /* not, or, and */
85
79
#include <argp.h> /* struct argp_option, error_t, struct
147
141
static const char sys_class_net[] = "/sys/class/net";
148
142
char *connect_to = NULL;
149
143
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
144
uid_t uid = 65534;
152
145
gid_t gid = 65534;
153
146
239
232
.af = af };
240
233
if(new_server->ip == NULL){
241
234
perror_plus("strdup");
242
free(new_server);
243
235
return false;
244
236
}
245
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
238
if(ret == -1){
247
239
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);
257
240
return false;
258
241
}
259
242
/* Special case of first server */
275
258
* Initialize GPGME.
276
259
*/
277
260
__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){
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
282
263
gpgme_error_t rc;
283
264
gpgme_engine_info_t engine_info;
284
265
285
266
/*
286
267
* Helper function to insert pub and seckey to the engine keyring.
287
268
*/
288
bool import_key(const char * const filename){
269
bool import_key(const char *filename){
289
270
int ret;
290
271
int fd;
291
272
gpgme_data_t pgp_data;
310
291
return false;
311
292
}
312
293
313
ret = close(fd);
294
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
295
if(ret == -1){
315
296
perror_plus("close");
316
297
}
498
479
return plaintext_length;
499
480
}
500
481
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
482
__attribute__((warn_unused_result))
509
483
static const char *safer_gnutls_strerror(int value){
510
484
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
485
if(ret == NULL)
486
ret = "(unknown)";
487
return ret;
512
488
}
513
489
514
490
/* GnuTLS log function callback */
518
494
fprintf_plus(stderr, "GnuTLS: %s", string);
519
495
}
520
496
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
497
__attribute__((nonnull, warn_unused_result))
522
498
static int init_gnutls_global(const char *pubkeyfilename,
523
499
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
500
mandos_context *mc){
526
501
int ret;
527
unsigned int uret;
528
502
529
503
if(debug){
530
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
505
}
532
506
507
ret = gnutls_global_init();
508
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
511
return -1;
512
}
513
533
514
if(debug){
534
515
/* "Use a log level over 10 to enable all debugging options."
535
516
* - GnuTLS manual
543
524
if(ret != GNUTLS_E_SUCCESS){
544
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
526
safer_gnutls_strerror(ret));
527
gnutls_global_deinit();
546
528
return -1;
547
529
}
548
530
573
555
safer_gnutls_strerror(ret));
574
556
goto globalfail;
575
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
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
559
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
562
goto globalfail;
563
}
564
749
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
566
751
567
return 0;
753
569
globalfail:
754
570
755
571
gnutls_certificate_free_credentials(mc->cred);
572
gnutls_global_deinit();
756
573
gnutls_dh_params_deinit(mc->dh_params);
757
574
return -1;
758
575
}
810
627
/* ignore client certificate if any. */
811
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
629
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
631
813
632
return 0;
814
633
}
815
634
817
636
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
637
__attribute__((unused)) const char *txt){}
819
638
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
1038
639
/* Called when a Mandos server is found */
1039
640
__attribute__((nonnull, warn_unused_result))
1040
641
static int start_mandos_communication(const char *ip, in_port_t port,
1051
652
int retval = -1;
1052
653
gnutls_session_t session;
1053
654
int pf; /* Protocol family */
1054
bool route_added = false;
1055
655
1056
656
errno = 0;
1057
657
1079
679
bool match = false;
1080
680
{
1081
681
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
1085
684
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
685
match = true;
1087
686
break;
1116
715
PRIuMAX "\n", ip, (uintmax_t)port);
1117
716
}
1118
717
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
719
if(tcp_sd < 0){
1121
720
int e = errno;
1122
721
perror_plus("socket");
1129
728
goto mandos_end;
1130
729
}
1131
730
731
memset(&to, 0, sizeof(to));
1132
732
if(af == AF_INET6){
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);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1136
735
} else { /* IPv4 */
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);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1140
738
}
1141
739
if(ret < 0 ){
1142
740
int e = errno;
1212
810
goto mandos_end;
1213
811
}
1214
812
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;
813
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
816
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
819
}
820
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
int e = errno;
823
perror_plus("connect");
824
errno = e;
825
}
826
goto mandos_end;
827
}
828
829
if(quit_now){
830
errno = EINTR;
831
goto mandos_end;
1270
832
}
1271
833
1272
834
const char *out = mandos_protocol_version;
1426
988
&decrypted_buffer, mc);
1427
989
if(decrypted_buffer_size >= 0){
1428
990
1429
clearerr(stdout);
1430
991
written = 0;
1431
992
while(written < (size_t) decrypted_buffer_size){
1432
993
if(quit_now){
1448
1009
}
1449
1010
written += (size_t)ret;
1450
1011
}
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
}
1461
1012
retval = 0;
1462
1013
}
1463
1014
}
1466
1017
1467
1018
mandos_end:
1468
1019
{
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
}
1475
1020
int e = errno;
1476
1021
free(decrypted_buffer);
1477
1022
free(buffer);
1478
1023
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
1024
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
1025
}
1481
1026
if(ret == -1){
1482
1027
if(e == 0){
1494
1039
return retval;
1495
1040
}
1496
1041
1042
__attribute__((nonnull))
1497
1043
static void resolve_callback(AvahiSServiceResolver *r,
1498
1044
AvahiIfIndex interface,
1499
1045
AvahiProtocol proto,
1516
1062
timed out */
1517
1063
1518
1064
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1520
1065
return;
1521
1066
}
1522
1067
1636
1181
__attribute__((nonnull, warn_unused_result))
1637
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1183
int ret;
1639
int old_errno;
1184
error_t ret_errno;
1640
1185
1641
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1187
if(s < 0){
1643
old_errno = errno;
1188
ret_errno = errno;
1644
1189
perror_plus("socket");
1645
errno = old_errno;
1190
errno = ret_errno;
1646
1191
return false;
1647
1192
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1193
strcpy(ifr->ifr_name, ifname);
1650
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1195
if(ret == -1){
1652
1196
if(debug){
1653
old_errno = errno;
1197
ret_errno = errno;
1654
1198
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1199
errno = ret_errno;
1656
1200
}
1657
1201
return false;
1658
1202
}
1789
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
1334
"abcdefghijklmnopqrstuvwxyz"
1791
1335
"0123456789"
1792
"_.-");
1336
"_-");
1793
1337
if((direntry->d_name)[sret] != '\0'){
1794
1338
/* Contains non-allowed characters */
1795
1339
if(debug){
1799
1343
return 0;
1800
1344
}
1801
1345
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1803
1354
if(ret == -1){
1804
1355
if(debug){
1805
1356
perror_plus("Could not stat hook");
1903
1454
}
1904
1455
}
1905
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1906
1513
__attribute__((nonnull))
1907
1514
void run_network_hooks(const char *mode, const char *interface,
1908
1515
const float delay){
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);
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1927
1519
if(numhooks == -1){
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);
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1943
1527
}
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){
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1990
1537
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1995
1613
free(delaystring);
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;
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
2064
1625
} else {
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);
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
2084
1661
}
2085
1662
2086
1663
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
2090
1667
int ret;
2091
1668
struct ifreq network;
2092
1669
unsigned int if_index = if_nametoindex(interface);
2102
1679
}
2103
1680
2104
1681
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
1682
error_t ret_errno = 0, ioctl_errno = 0;
2107
1683
if(not get_flags(interface, &network)){
2108
1684
ret_errno = errno;
2109
1685
fprintf_plus(stderr, "Failed to get flags for interface "
2122
1698
}
2123
1699
2124
1700
if(quit_now){
2125
ret = close(sd);
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2126
1702
if(ret == -1){
2127
1703
perror_plus("close");
2128
1704
}
2137
1713
2138
1714
/* Raise privileges */
2139
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
2140
1717
if(ret_errno != 0){
2141
errno = ret_errno;
2142
1718
perror_plus("Failed to raise privileges");
2143
1719
}
2144
2145
1720
#ifdef __linux__
2146
1721
int ret_linux;
2147
bool restore_loglevel = false;
2148
1722
if(ret_errno == 0){
2149
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
1724
messages about the network interface to mess up the prompt */
2178
1752
}
2179
1753
2180
1754
/* Close the socket */
2181
ret = close(sd);
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1756
if(ret == -1){
2183
1757
perror_plus("close");
2184
1758
}
2196
1770
2197
1771
/* Sleep checking until interface is running.
2198
1772
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
1773
for(int i=0; i < delay * 4; i++){
2200
1774
if(interface_is_running(interface)){
2201
1775
break;
2202
1776
}
2212
1786
}
2213
1787
2214
1788
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
2217
1791
struct ifreq network;
2218
1792
unsigned int if_index = if_nametoindex(interface);
2219
1793
if(if_index == 0){
2222
1796
return ENXIO;
2223
1797
}
2224
1798
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
1799
error_t ret_errno = 0, ioctl_errno = 0;
2227
1800
if(not get_flags(interface, &network) and debug){
2228
1801
ret_errno = errno;
2229
1802
fprintf_plus(stderr, "Failed to get flags for interface "
2249
1822
/* Raise privileges */
2250
1823
ret_errno = raise_privileges();
2251
1824
if(ret_errno != 0){
2252
errno = ret_errno;
2253
1825
perror_plus("Failed to raise privileges");
2254
1826
}
2255
2256
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
1828
ioctl_errno = errno;
2258
1829
2267
1838
}
2268
1839
2269
1840
/* Close the socket */
2270
int ret = close(sd);
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1842
if(ret == -1){
2272
1843
perror_plus("close");
2273
1844
}
2288
1859
}
2289
1860
2290
1861
int main(int argc, char *argv[]){
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 };
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
2296
1866
AvahiSServiceBrowser *sb = NULL;
2297
1867
error_t ret_errno;
2298
1868
int ret;
2301
1871
int exitcode = EXIT_SUCCESS;
2302
1872
char *interfaces_to_take_down = NULL;
2303
1873
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1874
char tempdir[] = "/tmp/mandosXXXXXX";
1875
bool tempdir_created = false;
2307
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1877
const char *seckey = PATHDIR "/" SECKEY;
2309
1878
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
1879
char *interfaces_hooks = NULL;
2312
1880
2313
1881
bool gnutls_initialized = false;
2366
1934
.doc = "Bit length of the prime number used in the"
2367
1935
" Diffie-Hellman key exchange",
2368
1936
.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 },
2374
1937
{ .name = "priority", .key = 130,
2375
1938
.arg = "STRING",
2376
1939
.doc = "GnuTLS priority string for the TLS handshake",
2431
1994
}
2432
1995
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1996
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1997
case 130: /* --priority */
2438
1998
mc.priority = arg;
2439
1999
break;
2479
2039
.args_doc = "",
2480
2040
.doc = "Mandos client -- Get and decrypt"
2481
2041
" passwords from a Mandos server" };
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2042
ret = argp_parse(&argp, argc, argv,
2043
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2044
switch(ret){
2485
2045
case 0:
2486
2046
break;
2487
2047
case ENOMEM:
2488
2048
default:
2489
errno = ret_errno;
2049
errno = ret;
2490
2050
perror_plus("argp_parse");
2491
2051
exitcode = EX_OSERR;
2492
2052
goto end;
2495
2055
goto end;
2496
2056
}
2497
2057
}
2498
2058
2499
2059
{
2500
2060
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2061
<http://bugs.debian.org/633582> */
2502
2062
2503
2063
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2507
2067
perror_plus("Failed to raise privileges");
2508
2068
} else {
2509
2069
struct stat st;
2525
2085
}
2526
2086
}
2527
2087
}
2528
close(seckey_fd);
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2089
}
2530
2090
}
2531
2091
2532
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2094
if(pubkey_fd == -1){
2546
2106
}
2547
2107
}
2548
2108
}
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
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2575
2113
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2579
2117
perror_plus("Failed to lower privileges");
2580
2118
}
2581
2119
}
2694
2232
2695
2233
/* If no interfaces were specified, make a list */
2696
2234
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2235
struct dirent **direntries;
2698
2236
/* Look for any good interfaces */
2699
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2700
2238
alphasort);
2706
2244
if(ret_errno != 0){
2707
2245
errno = ret_errno;
2708
2246
perror_plus("argz_add");
2709
free(direntries[i]);
2710
2247
continue;
2711
2248
}
2712
2249
if(debug){
2713
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
2251
direntries[i]->d_name);
2715
2252
}
2716
free(direntries[i]);
2717
2253
}
2718
2254
free(direntries);
2719
2255
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2256
free(direntries);
2723
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2724
2258
exitcode = EXIT_FAILURE;
2725
2259
goto end;
2751
2285
errno = bring_up_interface(interface, delay);
2752
2286
if(not interface_was_up){
2753
2287
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2288
perror_plus("Failed to bring up interface");
2756
2289
} else {
2757
2290
errno = argz_add(&interfaces_to_take_down,
2758
2291
&interfaces_to_take_down_size,
2781
2314
goto end;
2782
2315
}
2783
2316
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2318
if(ret == -1){
2786
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2320
exitcode = EX_UNAVAILABLE;
2794
2327
goto end;
2795
2328
}
2796
2329
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){
2330
if(mkdtemp(tempdir) == NULL){
2807
2331
perror_plus("mkdtemp");
2808
2332
goto end;
2809
2333
}
2334
tempdir_created = true;
2810
2335
2811
2336
if(quit_now){
2812
2337
goto end;
2909
2434
2910
2435
/* Allocate a new server */
2911
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2437
&config, NULL, NULL, &ret_errno);
2913
2438
2914
2439
/* Free the Avahi configuration data */
2915
2440
avahi_server_config_free(&config);
2918
2443
/* Check if creating the Avahi server object succeeded */
2919
2444
if(mc.server == NULL){
2920
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2446
avahi_strerror(ret_errno));
2922
2447
exitcode = EX_UNAVAILABLE;
2923
2448
goto end;
2924
2449
}
2948
2473
if(debug){
2949
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2475
}
2951
2476
2952
2477
ret = avahi_loop_with_timeout(simple_poll,
2953
2478
(int)(retry_interval * 1000), &mc);
2954
2479
if(debug){
2959
2484
end:
2960
2485
2961
2486
if(debug){
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
}
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2488
}
2970
2489
2971
2490
/* Cleanup things */
2982
2501
2983
2502
if(gnutls_initialized){
2984
2503
gnutls_certificate_free_credentials(mc.cred);
2504
gnutls_global_deinit();
2985
2505
gnutls_dh_params_deinit(mc.dh_params);
2986
2506
}
2987
2507
2995
2515
mc.current_server->prev->next = NULL;
2996
2516
while(mc.current_server != NULL){
2997
2517
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
3006
2518
free(mc.current_server);
3007
2519
mc.current_server = next;
3008
2520
}
3010
2522
3011
2523
/* Re-raise privileges */
3012
2524
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
3016
2527
perror_plus("Failed to raise privileges");
3017
2528
} else {
3018
2529
3023
2534
/* Take down the network interfaces which were brought up */
3024
2535
{
3025
2536
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;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
3032
2543
perror_plus("Failed to take down interface");
3033
2544
}
3034
2545
}
3038
2549
}
3039
2550
}
3040
2551
}
3041
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
3045
2554
perror_plus("Failed to lower privileges permanently");
3046
2555
}
3047
2556
}
3049
2558
free(interfaces_to_take_down);
3050
2559
free(interfaces_hooks);
3051
2560
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
2561
/* Removes the GPGME temp directory and all files inside */
2562
if(tempdir_created){
3054
2563
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){
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
3067
2568
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
3108
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2569
direntry = direntries[i];
2570
char *fullname = NULL;
2571
ret = asprintf(&fullname, "%s/%s", tempdir,
2572
direntry->d_name);
2573
if(ret < 0){
2574
perror_plus("asprintf");
2575
continue;
2576
}
2577
ret = remove(fullname);
2578
if(ret == -1){
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
2581
}
2582
free(fullname);
2583
}
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
2590
}
2591
ret = rmdir(tempdir);
2592
if(ret == -1 and errno != ENOENT){
2593
perror_plus("rmdir");
2594
}
3111
2595
}
3112
2596
3113
2597
if(quit_now){
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Version: 2.0.2.dev0