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237.7.172
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2013-10-13 15:43:42 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 303.
- Revision ID: teddy@recompile.se-20131013154342-2ztabynqog6xuk0t
* initramfs-unpack: Bug fix: Made executable.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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,
56
55
opendir(), DIR */
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
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,
64
#include <errno.h> /* perror(), errno,
71
65
program_invocation_short_name */
72
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
72
*/
79
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
74
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
84
77
#include <iso646.h> /* not, or, and */
85
78
#include <argp.h> /* struct argp_option, error_t, struct
86
79
argp_state, struct argp,
98
91
argz_delete(), argz_append(),
99
92
argz_stringify(), argz_add(),
100
93
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
94
104
95
#ifdef __linux__
105
96
#include <sys/klog.h> /* klogctl() */
147
138
static const char sys_class_net[] = "/sys/class/net";
148
139
char *connect_to = NULL;
149
140
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
141
uid_t uid = 65534;
152
142
gid_t gid = 65534;
153
143
190
180
perror(print_text);
191
181
}
192
182
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
194
184
int fprintf_plus(FILE *stream, const char *format, ...){
195
185
va_list ap;
196
186
va_start (ap, format);
205
195
* bytes. "buffer_capacity" is how much is currently allocated,
206
196
* "buffer_length" is how much is already used.
207
197
*/
208
__attribute__((nonnull, warn_unused_result))
209
198
size_t incbuffer(char **buffer, size_t buffer_length,
210
199
size_t buffer_capacity){
211
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
218
203
return 0;
219
204
}
220
*buffer = new_buf;
221
205
buffer_capacity += BUFFER_SIZE;
222
206
}
223
207
return buffer_capacity;
224
208
}
225
209
226
210
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
212
int af, server **current_server){
230
213
int ret;
239
222
.af = af };
240
223
if(new_server->ip == NULL){
241
224
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
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);
257
225
return false;
258
226
}
259
227
/* Special case of first server */
261
229
new_server->next = new_server;
262
230
new_server->prev = new_server;
263
231
*current_server = new_server;
232
/* Place the new server last in the list */
264
233
} else {
265
/* Place the new server last in the list */
266
234
new_server->next = *current_server;
267
235
new_server->prev = (*current_server)->prev;
268
236
new_server->prev->next = new_server;
269
237
(*current_server)->prev = new_server;
270
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
271
244
return true;
272
245
}
273
246
274
247
/*
275
248
* Initialize GPGME.
276
249
*/
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){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
282
252
gpgme_error_t rc;
283
253
gpgme_engine_info_t engine_info;
284
254
285
255
/*
286
256
* Helper function to insert pub and seckey to the engine keyring.
287
257
*/
288
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
289
259
int ret;
290
260
int fd;
291
261
gpgme_data_t pgp_data;
310
280
return false;
311
281
}
312
282
313
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
284
if(ret == -1){
315
285
perror_plus("close");
316
286
}
372
342
* Decrypt OpenPGP data.
373
343
* Returns -1 on error
374
344
*/
375
__attribute__((nonnull, warn_unused_result))
376
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
346
size_t crypto_size,
378
347
char **plaintext,
498
467
return plaintext_length;
499
468
}
500
469
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){
470
static const char * safer_gnutls_strerror(int value){
510
471
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
512
475
}
513
476
514
477
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
478
static void debuggnutls(__attribute__((unused)) int level,
517
479
const char* string){
518
480
fprintf_plus(stderr, "GnuTLS: %s", string);
519
481
}
520
482
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
483
static int init_gnutls_global(const char *pubkeyfilename,
523
484
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
485
mandos_context *mc){
526
486
int ret;
527
unsigned int uret;
528
487
529
488
if(debug){
530
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
490
}
532
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
533
499
if(debug){
534
500
/* "Use a log level over 10 to enable all debugging options."
535
501
* - GnuTLS manual
543
509
if(ret != GNUTLS_E_SUCCESS){
544
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
546
513
return -1;
547
514
}
548
515
573
540
safer_gnutls_strerror(ret));
574
541
goto globalfail;
575
542
}
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
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
749
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
750
551
751
552
return 0;
753
554
globalfail:
754
555
755
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
756
558
gnutls_dh_params_deinit(mc->dh_params);
757
559
return -1;
758
560
}
759
561
760
__attribute__((nonnull, warn_unused_result))
761
562
static int init_gnutls_session(gnutls_session_t *session,
762
563
mandos_context *mc){
763
564
int ret;
810
611
/* ignore client certificate if any. */
811
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
813
616
return 0;
814
617
}
815
618
817
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
621
__attribute__((unused)) const char *txt){}
819
622
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
623
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
624
static int start_mandos_communication(const char *ip, in_port_t port,
1041
625
AvahiIfIndex if_index,
1042
626
int af, mandos_context *mc){
1043
627
int ret, tcp_sd = -1;
1044
628
ssize_t sret;
1045
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1046
633
char *buffer = NULL;
1047
634
char *decrypted_buffer = NULL;
1048
635
size_t buffer_length = 0;
1051
638
int retval = -1;
1052
639
gnutls_session_t session;
1053
640
int pf; /* Protocol family */
1054
bool route_added = false;
1055
641
1056
642
errno = 0;
1057
643
1115
701
PRIuMAX "\n", ip, (uintmax_t)port);
1116
702
}
1117
703
1118
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
705
if(tcp_sd < 0){
1120
706
int e = errno;
1121
707
perror_plus("socket");
1128
714
goto mandos_end;
1129
715
}
1130
716
717
memset(&to, 0, sizeof(to));
1131
718
if(af == AF_INET6){
1132
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1133
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1134
ret = inet_pton(af, ip, &to6->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
721
} else { /* IPv4 */
1136
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1137
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1138
ret = inet_pton(af, ip, &to4->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
724
}
1140
725
if(ret < 0 ){
1141
726
int e = errno;
1150
735
goto mandos_end;
1151
736
}
1152
737
if(af == AF_INET6){
1153
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1154
if(IN6_IS_ADDR_LINKLOCAL
1155
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1156
742
if(if_index == AVAHI_IF_UNSPEC){
1157
743
fprintf_plus(stderr, "An IPv6 link-local address is"
1158
744
" incomplete without a network interface\n");
1160
746
goto mandos_end;
1161
747
}
1162
748
/* Set the network interface number as scope */
1163
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
750
}
1165
751
} else {
1166
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1167
755
}
1168
756
1169
757
if(quit_now){
1186
774
}
1187
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1188
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1189
if(af == AF_INET6){
1190
ret = getnameinfo((struct sockaddr *)&to,
1191
sizeof(struct sockaddr_in6),
1192
addrstr, sizeof(addrstr), NULL, 0,
1193
NI_NUMERICHOST);
1194
} else {
1195
ret = getnameinfo((struct sockaddr *)&to,
1196
sizeof(struct sockaddr_in),
1197
addrstr, sizeof(addrstr), NULL, 0,
1198
NI_NUMERICHOST);
1199
}
1200
if(ret == EAI_SYSTEM){
1201
perror_plus("getnameinfo");
1202
} else if(ret != 0) {
1203
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1204
} else if(strcmp(addrstr, ip) != 0){
1205
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1206
}
1207
}
1208
1209
if(quit_now){
1210
errno = EINTR;
1211
goto mandos_end;
1212
}
1213
1214
while(true){
1215
if(af == AF_INET6){
1216
ret = connect(tcp_sd, (struct sockaddr *)&to,
1217
sizeof(struct sockaddr_in6));
1218
} else {
1219
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1220
sizeof(struct sockaddr_in));
1221
}
1222
if(ret < 0){
1223
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
and if_index != AVAHI_IF_UNSPEC
1225
and connect_to == NULL
1226
and not route_added and
1227
((af == AF_INET6 and not
1228
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1229
&to)->sin6_addr)))
1230
or (af == AF_INET and
1231
/* Not a a IPv4LL address */
1232
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1233
& 0xFFFF0000L) != 0xA9FE0000L))){
1234
/* Work around Avahi bug - Avahi does not announce link-local
1235
addresses if it has a global address, so local hosts with
1236
*only* a link-local address (e.g. Mandos clients) cannot
1237
connect to a Mandos server announced by Avahi on a server
1238
host with a global address. Work around this by retrying
1239
with an explicit route added with the server's address.
1240
1241
Avahi bug reference:
1242
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
https://bugs.debian.org/587961
1244
*/
1245
if(debug){
1246
fprintf_plus(stderr, "Mandos server unreachable, trying"
1247
" direct route\n");
1248
}
1249
int e = errno;
1250
route_added = add_local_route(ip, if_index);
1251
if(route_added){
1252
continue;
1253
}
1254
errno = e;
1255
}
1256
if(errno != ECONNREFUSED or debug){
1257
int e = errno;
1258
perror_plus("connect");
1259
errno = e;
1260
}
1261
goto mandos_end;
1262
}
1263
1264
if(quit_now){
1265
errno = EINTR;
1266
goto mandos_end;
1267
}
1268
break;
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1269
816
}
1270
817
1271
818
const char *out = mandos_protocol_version;
1425
972
&decrypted_buffer, mc);
1426
973
if(decrypted_buffer_size >= 0){
1427
974
1428
clearerr(stdout);
1429
975
written = 0;
1430
976
while(written < (size_t) decrypted_buffer_size){
1431
977
if(quit_now){
1447
993
}
1448
994
written += (size_t)ret;
1449
995
}
1450
ret = fflush(stdout);
1451
if(ret != 0){
1452
int e = errno;
1453
if(debug){
1454
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1455
strerror(errno));
1456
}
1457
errno = e;
1458
goto mandos_end;
1459
}
1460
996
retval = 0;
1461
997
}
1462
998
}
1465
1001
1466
1002
mandos_end:
1467
1003
{
1468
if(route_added){
1469
if(not delete_local_route(ip, if_index)){
1470
fprintf_plus(stderr, "Failed to delete local route to %s on"
1471
" interface %d", ip, if_index);
1472
}
1473
}
1474
1004
int e = errno;
1475
1005
free(decrypted_buffer);
1476
1006
free(buffer);
1477
1007
if(tcp_sd >= 0){
1478
ret = close(tcp_sd);
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
1009
}
1480
1010
if(ret == -1){
1481
1011
if(e == 0){
1493
1023
return retval;
1494
1024
}
1495
1025
1496
__attribute__((nonnull))
1497
1026
static void resolve_callback(AvahiSServiceResolver *r,
1498
1027
AvahiIfIndex interface,
1499
1028
AvahiProtocol proto,
1507
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1508
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1509
1038
flags,
1510
void *mc){
1039
void* mc){
1511
1040
if(r == NULL){
1512
1041
return;
1513
1042
}
1516
1045
timed out */
1517
1046
1518
1047
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1520
1048
return;
1521
1049
}
1522
1050
1567
1095
const char *domain,
1568
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1569
1097
flags,
1570
void *mc){
1098
void* mc){
1571
1099
if(b == NULL){
1572
1100
return;
1573
1101
}
1633
1161
errno = old_errno;
1634
1162
}
1635
1163
1636
__attribute__((nonnull, warn_unused_result))
1637
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1165
int ret;
1639
int old_errno;
1166
error_t ret_errno;
1640
1167
1641
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1169
if(s < 0){
1643
old_errno = errno;
1170
ret_errno = errno;
1644
1171
perror_plus("socket");
1645
errno = old_errno;
1172
errno = ret_errno;
1646
1173
return false;
1647
1174
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1175
strcpy(ifr->ifr_name, ifname);
1650
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1177
if(ret == -1){
1652
1178
if(debug){
1653
old_errno = errno;
1179
ret_errno = errno;
1654
1180
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1181
errno = ret_errno;
1656
1182
}
1657
1183
return false;
1658
1184
}
1659
1185
return true;
1660
1186
}
1661
1187
1662
__attribute__((nonnull, warn_unused_result))
1663
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1664
1189
1665
1190
/* Reject the loopback device */
1707
1232
* corresponds to an acceptable network device.
1708
1233
* (This function is passed to scandir(3) as a filter function.)
1709
1234
*/
1710
__attribute__((nonnull, warn_unused_result))
1711
1235
int good_interface(const struct dirent *if_entry){
1712
1236
if(if_entry->d_name[0] == '.'){
1713
1237
return 0;
1731
1255
/*
1732
1256
* This function determines if a network interface is up.
1733
1257
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
1258
bool interface_is_up(const char *interface){
1736
1259
struct ifreq ifr;
1737
1260
if(not get_flags(interface, &ifr)){
1748
1271
/*
1749
1272
* This function determines if a network interface is running
1750
1273
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
1274
bool interface_is_running(const char *interface){
1753
1275
struct ifreq ifr;
1754
1276
if(not get_flags(interface, &ifr)){
1762
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
1285
}
1764
1286
1765
__attribute__((nonnull, pure, warn_unused_result))
1766
1287
int notdotentries(const struct dirent *direntry){
1767
1288
/* Skip "." and ".." */
1768
1289
if(direntry->d_name[0] == '.'
1775
1296
}
1776
1297
1777
1298
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1779
1299
int runnable_hook(const struct dirent *direntry){
1780
1300
int ret;
1781
1301
size_t sret;
1789
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
1310
"abcdefghijklmnopqrstuvwxyz"
1791
1311
"0123456789"
1792
"_.-");
1312
"_-");
1793
1313
if((direntry->d_name)[sret] != '\0'){
1794
1314
/* Contains non-allowed characters */
1795
1315
if(debug){
1799
1319
return 0;
1800
1320
}
1801
1321
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1803
1330
if(ret == -1){
1804
1331
if(debug){
1805
1332
perror_plus("Could not stat hook");
1829
1356
return 1;
1830
1357
}
1831
1358
1832
__attribute__((nonnull, warn_unused_result))
1833
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
1360
mandos_context *mc){
1835
1361
int ret;
1839
1365
1840
1366
while(true){
1841
1367
if(mc->current_server == NULL){
1842
if(debug){
1368
if (debug){
1843
1369
fprintf_plus(stderr, "Wait until first server is found."
1844
1370
" No timeout!\n");
1845
1371
}
1846
1372
ret = avahi_simple_poll_iterate(s, -1);
1847
1373
} else {
1848
if(debug){
1374
if (debug){
1849
1375
fprintf_plus(stderr, "Check current_server if we should run"
1850
1376
" it, or wait\n");
1851
1377
}
1868
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1869
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1870
1396
1871
if(debug){
1397
if (debug){
1872
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1873
1399
block_time);
1874
1400
}
1896
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
1423
}
1898
1424
if(ret != 0){
1899
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1900
1426
return (ret != 1) ? ret : 0;
1901
1427
}
1902
1428
}
1903
1429
}
1904
1430
}
1905
1431
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1908
1485
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);
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1927
1491
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);
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1943
1499
}
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){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1990
1507
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1995
1566
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;
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
2064
1578
} 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);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2084
1615
}
2085
1616
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;
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2091
1623
struct ifreq network;
2092
1624
unsigned int if_index = if_nametoindex(interface);
2093
1625
if(if_index == 0){
2102
1634
}
2103
1635
2104
1636
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
2108
1638
ret_errno = errno;
2109
1639
fprintf_plus(stderr, "Failed to get flags for interface "
2110
1640
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
1641
return ret_errno;
2113
1642
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
2115
1644
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2118
1647
ret_errno = errno;
2119
1648
perror_plus("socket");
2120
1649
errno = old_errno;
2121
1650
return ret_errno;
2122
1651
}
2123
1652
2124
1653
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
1654
close(sd);
2129
1655
errno = old_errno;
2130
1656
return EINTR;
2131
1657
}
2135
1661
interface);
2136
1662
}
2137
1663
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
}
1664
/* Raise priviliges */
1665
raise_privileges();
2144
1666
2145
1667
#ifdef __linux__
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
}
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2157
1675
}
2158
1676
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2161
1679
#ifdef __linux__
2162
1680
if(restore_loglevel){
2163
1681
ret_linux = klogctl(7, NULL, 0);
2167
1685
}
2168
1686
#endif /* __linux__ */
2169
1687
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
}
1688
/* Lower privileges */
1689
lower_privileges();
2179
1690
2180
1691
/* Close the socket */
2181
ret = close(sd);
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1693
if(ret == -1){
2183
1694
perror_plus("close");
2184
1695
}
2185
1696
2186
1697
if(ret_setflags == -1){
2187
errno = ioctl_errno;
1698
errno = ret_errno;
2188
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
1700
errno = old_errno;
2190
return ioctl_errno;
1701
return ret_errno;
2191
1702
}
2192
1703
} else if(debug){
2193
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2211
1722
return 0;
2212
1723
}
2213
1724
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2217
1730
struct ifreq network;
2218
1731
unsigned int if_index = if_nametoindex(interface);
2219
1732
if(if_index == 0){
2222
1735
return ENXIO;
2223
1736
}
2224
1737
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
1738
if(not get_flags(interface, &network) and debug){
2228
1739
ret_errno = errno;
2229
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2230
1741
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
1742
return ret_errno;
2233
1743
}
2234
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
1745
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2238
1748
ret_errno = errno;
2239
1749
perror_plus("socket");
2240
1750
errno = old_errno;
2246
1756
interface);
2247
1757
}
2248
1758
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
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
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
}
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2268
1767
2269
1768
/* Close the socket */
2270
int ret = close(sd);
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
1770
if(ret == -1){
2272
1771
perror_plus("close");
2273
1772
}
2274
1773
2275
1774
if(ret_setflags == -1){
2276
errno = ioctl_errno;
1775
errno = ret_errno;
2277
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
1777
errno = old_errno;
2279
return ioctl_errno;
1778
return ret_errno;
2280
1779
}
2281
1780
} else if(debug){
2282
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
1787
}
2289
1788
2290
1789
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 };
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2296
1794
AvahiSServiceBrowser *sb = NULL;
2297
1795
error_t ret_errno;
2298
1796
int ret;
2301
1799
int exitcode = EXIT_SUCCESS;
2302
1800
char *interfaces_to_take_down = NULL;
2303
1801
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;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2307
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1805
const char *seckey = PATHDIR "/" SECKEY;
2309
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2312
1809
2313
1810
bool gnutls_initialized = false;
2314
1811
bool gpgme_initialized = false;
2366
1863
.doc = "Bit length of the prime number used in the"
2367
1864
" Diffie-Hellman key exchange",
2368
1865
.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
1866
{ .name = "priority", .key = 130,
2375
1867
.arg = "STRING",
2376
1868
.doc = "GnuTLS priority string for the TLS handshake",
2431
1923
}
2432
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1925
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1926
case 130: /* --priority */
2438
1927
mc.priority = arg;
2439
1928
break;
2479
1968
.args_doc = "",
2480
1969
.doc = "Mandos client -- Get and decrypt"
2481
1970
" 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){
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2485
1974
case 0:
2486
1975
break;
2487
1976
case ENOMEM:
2488
1977
default:
2489
errno = ret_errno;
1978
errno = ret;
2490
1979
perror_plus("argp_parse");
2491
1980
exitcode = EX_OSERR;
2492
1981
goto end;
2495
1984
goto end;
2496
1985
}
2497
1986
}
2498
1987
2499
1988
{
2500
1989
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
1990
<http://bugs.debian.org/633582> */
2502
1991
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
2508
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2509
1994
struct stat st;
2510
1995
2511
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2525
2010
}
2526
2011
}
2527
2012
}
2528
close(seckey_fd);
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
2014
}
2530
2015
}
2531
2016
2532
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2534
2019
if(pubkey_fd == -1){
2546
2031
}
2547
2032
}
2548
2033
}
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
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2575
2038
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2039
lower_privileges();
2581
2040
}
2582
2041
}
2583
2042
2607
2066
goto end;
2608
2067
}
2609
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2614
2077
}
2615
2078
2616
2079
if(not debug){
2694
2157
2695
2158
/* If no interfaces were specified, make a list */
2696
2159
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2698
2161
/* Look for any good interfaces */
2699
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2700
2163
alphasort);
2704
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
2168
direntries[i]->d_name);
2706
2169
if(ret_errno != 0){
2707
errno = ret_errno;
2708
2170
perror_plus("argz_add");
2709
free(direntries[i]);
2710
2171
continue;
2711
2172
}
2712
2173
if(debug){
2713
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
2175
direntries[i]->d_name);
2715
2176
}
2716
free(direntries[i]);
2717
2177
}
2718
2178
free(direntries);
2719
2179
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2180
free(direntries);
2723
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2724
2182
exitcode = EXIT_FAILURE;
2725
2183
goto end;
2748
2206
break;
2749
2207
}
2750
2208
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2752
2210
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2756
2214
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2763
2218
}
2764
2219
}
2765
2220
}
2781
2236
goto end;
2782
2237
}
2783
2238
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2785
2240
if(ret == -1){
2786
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2242
exitcode = EX_UNAVAILABLE;
2794
2249
goto end;
2795
2250
}
2796
2251
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){
2252
if(mkdtemp(tempdir) == NULL){
2807
2253
perror_plus("mkdtemp");
2808
2254
goto end;
2809
2255
}
2256
tempdir_created = true;
2810
2257
2811
2258
if(quit_now){
2812
2259
goto end;
2887
2334
sleep((unsigned int)retry_interval);
2888
2335
}
2889
2336
2890
if(not quit_now){
2337
if (not quit_now){
2891
2338
exitcode = EXIT_SUCCESS;
2892
2339
}
2893
2340
2909
2356
2910
2357
/* Allocate a new server */
2911
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2359
&config, NULL, NULL, &ret_errno);
2913
2360
2914
2361
/* Free the Avahi configuration data */
2915
2362
avahi_server_config_free(&config);
2918
2365
/* Check if creating the Avahi server object succeeded */
2919
2366
if(mc.server == NULL){
2920
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2368
avahi_strerror(ret_errno));
2922
2369
exitcode = EX_UNAVAILABLE;
2923
2370
goto end;
2924
2371
}
2948
2395
if(debug){
2949
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2397
}
2951
2398
2952
2399
ret = avahi_loop_with_timeout(simple_poll,
2953
2400
(int)(retry_interval * 1000), &mc);
2954
2401
if(debug){
2959
2406
end:
2960
2407
2961
2408
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
}
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2410
}
2970
2411
2971
2412
/* Cleanup things */
2982
2423
2983
2424
if(gnutls_initialized){
2984
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2985
2427
gnutls_dh_params_deinit(mc.dh_params);
2986
2428
}
2987
2429
2995
2437
mc.current_server->prev->next = NULL;
2996
2438
while(mc.current_server != NULL){
2997
2439
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
2440
free(mc.current_server);
3007
2441
mc.current_server = next;
3008
2442
}
3009
2443
}
3010
2444
3011
/* Re-raise privileges */
2445
/* Re-raise priviliges */
3012
2446
{
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
}
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3047
2472
}
3048
2473
3049
2474
free(interfaces_to_take_down);
3050
2475
free(interfaces_hooks);
3051
2476
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
3054
2479
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){
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
3067
2484
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);
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3111
2511
}
3112
2512
3113
2513
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0