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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
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() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
70
65
program_invocation_short_name */
71
66
#include <time.h> /* nanosleep(), time(), sleep() */
72
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
77
72
*/
78
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
74
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
83
77
#include <iso646.h> /* not, or, and */
84
78
#include <argp.h> /* struct argp_option, error_t, struct
85
79
argp_state, struct argp,
97
91
argz_delete(), argz_append(),
98
92
argz_stringify(), argz_add(),
99
93
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
102
94
103
95
#ifdef __linux__
104
96
#include <sys/klog.h> /* klogctl() */
146
138
static const char sys_class_net[] = "/sys/class/net";
147
139
char *connect_to = NULL;
148
140
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
141
uid_t uid = 65534;
151
142
gid_t gid = 65534;
152
143
189
180
perror(print_text);
190
181
}
191
182
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
193
184
int fprintf_plus(FILE *stream, const char *format, ...){
194
185
va_list ap;
195
186
va_start (ap, format);
196
187
197
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
189
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
191
}
201
192
202
193
/*
204
195
* bytes. "buffer_capacity" is how much is currently allocated,
205
196
* "buffer_length" is how much is already used.
206
197
*/
207
__attribute__((nonnull, warn_unused_result))
208
198
size_t incbuffer(char **buffer, size_t buffer_length,
209
199
size_t buffer_capacity){
210
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
217
203
return 0;
218
204
}
219
*buffer = new_buf;
220
205
buffer_capacity += BUFFER_SIZE;
221
206
}
222
207
return buffer_capacity;
223
208
}
224
209
225
210
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
212
int af, server **current_server){
229
213
int ret;
238
222
.af = af };
239
223
if(new_server->ip == NULL){
240
224
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
225
return false;
257
226
}
258
227
/* Special case of first server */
260
229
new_server->next = new_server;
261
230
new_server->prev = new_server;
262
231
*current_server = new_server;
232
/* Place the new server last in the list */
263
233
} else {
264
/* Place the new server last in the list */
265
234
new_server->next = *current_server;
266
235
new_server->prev = (*current_server)->prev;
267
236
new_server->prev->next = new_server;
268
237
(*current_server)->prev = new_server;
269
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
270
244
return true;
271
245
}
272
246
273
247
/*
274
248
* Initialize GPGME.
275
249
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
281
252
gpgme_error_t rc;
282
253
gpgme_engine_info_t engine_info;
283
254
284
255
/*
285
256
* Helper function to insert pub and seckey to the engine keyring.
286
257
*/
287
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
288
259
int ret;
289
260
int fd;
290
261
gpgme_data_t pgp_data;
309
280
return false;
310
281
}
311
282
312
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
284
if(ret == -1){
314
285
perror_plus("close");
315
286
}
371
342
* Decrypt OpenPGP data.
372
343
* Returns -1 on error
373
344
*/
374
__attribute__((nonnull, warn_unused_result))
375
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
346
size_t crypto_size,
377
347
char **plaintext,
497
467
return plaintext_length;
498
468
}
499
469
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
509
471
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
511
475
}
512
476
513
477
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
478
static void debuggnutls(__attribute__((unused)) int level,
516
479
const char* string){
517
480
fprintf_plus(stderr, "GnuTLS: %s", string);
518
481
}
519
482
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
483
static int init_gnutls_global(const char *pubkeyfilename,
522
484
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
485
mandos_context *mc){
525
486
int ret;
526
unsigned int uret;
527
487
528
488
if(debug){
529
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
490
}
531
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
532
499
if(debug){
533
500
/* "Use a log level over 10 to enable all debugging options."
534
501
* - GnuTLS manual
542
509
if(ret != GNUTLS_E_SUCCESS){
543
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
545
513
return -1;
546
514
}
547
515
572
540
safer_gnutls_strerror(ret));
573
541
goto globalfail;
574
542
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
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
747
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
748
551
749
552
return 0;
751
554
globalfail:
752
555
753
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
754
558
gnutls_dh_params_deinit(mc->dh_params);
755
559
return -1;
756
560
}
757
561
758
__attribute__((nonnull, warn_unused_result))
759
562
static int init_gnutls_session(gnutls_session_t *session,
760
563
mandos_context *mc){
761
564
int ret;
808
611
/* ignore client certificate if any. */
809
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
811
616
return 0;
812
617
}
813
618
815
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
621
__attribute__((unused)) const char *txt){}
817
622
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
623
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
624
static int start_mandos_communication(const char *ip, in_port_t port,
1039
625
AvahiIfIndex if_index,
1040
626
int af, mandos_context *mc){
1041
627
int ret, tcp_sd = -1;
1042
628
ssize_t sret;
1043
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1044
633
char *buffer = NULL;
1045
634
char *decrypted_buffer = NULL;
1046
635
size_t buffer_length = 0;
1049
638
int retval = -1;
1050
639
gnutls_session_t session;
1051
640
int pf; /* Protocol family */
1052
bool route_added = false;
1053
641
1054
642
errno = 0;
1055
643
1071
659
return -1;
1072
660
}
1073
661
1074
/* If the interface is specified and we have a list of interfaces */
1075
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
663
/* Check if the interface is one of the interfaces we are using */
1077
664
bool match = false;
1086
673
}
1087
674
}
1088
675
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
676
if(debug){
1092
677
char interface[IF_NAMESIZE];
1093
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1113
698
PRIuMAX "\n", ip, (uintmax_t)port);
1114
699
}
1115
700
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
702
if(tcp_sd < 0){
1118
703
int e = errno;
1119
704
perror_plus("socket");
1126
711
goto mandos_end;
1127
712
}
1128
713
714
memset(&to, 0, sizeof(to));
1129
715
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
716
to.in6.sin6_family = (sa_family_t)af;
717
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
718
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
719
to.in.sin_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
721
}
1138
722
if(ret < 0 ){
1139
723
int e = errno;
1148
732
goto mandos_end;
1149
733
}
1150
734
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
735
to.in6.sin6_port = htons(port);
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
-Wunreachable-code*/
1154
739
if(if_index == AVAHI_IF_UNSPEC){
1155
740
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
741
" incomplete without a network interface\n");
1158
743
goto mandos_end;
1159
744
}
1160
745
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
746
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
747
}
1163
748
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
749
to.in.sin_port = htons(port); /* Spurious warnings from
750
-Wconversion and
751
-Wunreachable-code */
1165
752
}
1166
753
1167
754
if(quit_now){
1184
771
}
1185
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
774
const char *pcret;
775
if(af == AF_INET6){
776
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
777
sizeof(addrstr));
778
} else {
779
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
780
sizeof(addrstr));
781
}
782
if(pcret == NULL){
783
perror_plus("inet_ntop");
784
} else {
785
if(strcmp(addrstr, ip) != 0){
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
787
}
788
}
789
}
790
791
if(quit_now){
792
errno = EINTR;
793
goto mandos_end;
794
}
795
796
if(af == AF_INET6){
797
ret = connect(tcp_sd, &to.in6, sizeof(to));
798
} else {
799
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
800
}
801
if(ret < 0){
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
803
int e = errno;
804
perror_plus("connect");
805
errno = e;
806
}
807
goto mandos_end;
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
1267
813
}
1268
814
1269
815
const char *out = mandos_protocol_version;
1452
998
1453
999
mandos_end:
1454
1000
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
1461
1001
int e = errno;
1462
1002
free(decrypted_buffer);
1463
1003
free(buffer);
1464
1004
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
1005
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
1006
}
1467
1007
if(ret == -1){
1468
1008
if(e == 0){
1480
1020
return retval;
1481
1021
}
1482
1022
1483
__attribute__((nonnull))
1484
1023
static void resolve_callback(AvahiSServiceResolver *r,
1485
1024
AvahiIfIndex interface,
1486
1025
AvahiProtocol proto,
1494
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
1495
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
1035
flags,
1497
void *mc){
1036
void* mc){
1498
1037
if(r == NULL){
1499
1038
return;
1500
1039
}
1503
1042
timed out */
1504
1043
1505
1044
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
1045
return;
1508
1046
}
1509
1047
1554
1092
const char *domain,
1555
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1556
1094
flags,
1557
void *mc){
1095
void* mc){
1558
1096
if(b == NULL){
1559
1097
return;
1560
1098
}
1620
1158
errno = old_errno;
1621
1159
}
1622
1160
1623
__attribute__((nonnull, warn_unused_result))
1624
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
1162
int ret;
1626
int old_errno;
1163
error_t ret_errno;
1627
1164
1628
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1629
1166
if(s < 0){
1630
old_errno = errno;
1167
ret_errno = errno;
1631
1168
perror_plus("socket");
1632
errno = old_errno;
1169
errno = ret_errno;
1633
1170
return false;
1634
1171
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1172
strcpy(ifr->ifr_name, ifname);
1637
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
1174
if(ret == -1){
1639
1175
if(debug){
1640
old_errno = errno;
1176
ret_errno = errno;
1641
1177
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = old_errno;
1178
errno = ret_errno;
1643
1179
}
1644
1180
return false;
1645
1181
}
1646
1182
return true;
1647
1183
}
1648
1184
1649
__attribute__((nonnull, warn_unused_result))
1650
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1651
1186
1652
1187
/* Reject the loopback device */
1694
1229
* corresponds to an acceptable network device.
1695
1230
* (This function is passed to scandir(3) as a filter function.)
1696
1231
*/
1697
__attribute__((nonnull, warn_unused_result))
1698
1232
int good_interface(const struct dirent *if_entry){
1699
1233
if(if_entry->d_name[0] == '.'){
1700
1234
return 0;
1718
1252
/*
1719
1253
* This function determines if a network interface is up.
1720
1254
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
1255
bool interface_is_up(const char *interface){
1723
1256
struct ifreq ifr;
1724
1257
if(not get_flags(interface, &ifr)){
1735
1268
/*
1736
1269
* This function determines if a network interface is running
1737
1270
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1271
bool interface_is_running(const char *interface){
1740
1272
struct ifreq ifr;
1741
1273
if(not get_flags(interface, &ifr)){
1749
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
1282
}
1751
1283
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
1284
int notdotentries(const struct dirent *direntry){
1754
1285
/* Skip "." and ".." */
1755
1286
if(direntry->d_name[0] == '.'
1762
1293
}
1763
1294
1764
1295
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
1296
int runnable_hook(const struct dirent *direntry){
1767
1297
int ret;
1768
1298
size_t sret;
1776
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
1307
"abcdefghijklmnopqrstuvwxyz"
1778
1308
"0123456789"
1779
"_.-");
1309
"_-");
1780
1310
if((direntry->d_name)[sret] != '\0'){
1781
1311
/* Contains non-allowed characters */
1782
1312
if(debug){
1786
1316
return 0;
1787
1317
}
1788
1318
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1790
1327
if(ret == -1){
1791
1328
if(debug){
1792
1329
perror_plus("Could not stat hook");
1816
1353
return 1;
1817
1354
}
1818
1355
1819
__attribute__((nonnull, warn_unused_result))
1820
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
1357
mandos_context *mc){
1822
1358
int ret;
1826
1362
1827
1363
while(true){
1828
1364
if(mc->current_server == NULL){
1829
if(debug){
1365
if (debug){
1830
1366
fprintf_plus(stderr, "Wait until first server is found."
1831
1367
" No timeout!\n");
1832
1368
}
1833
1369
ret = avahi_simple_poll_iterate(s, -1);
1834
1370
} else {
1835
if(debug){
1371
if (debug){
1836
1372
fprintf_plus(stderr, "Check current_server if we should run"
1837
1373
" it, or wait\n");
1838
1374
}
1855
1391
- ((intmax_t)waited_time.tv_sec * 1000))
1856
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1857
1393
1858
if(debug){
1394
if (debug){
1859
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1860
1396
block_time);
1861
1397
}
1883
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1884
1420
}
1885
1421
if(ret != 0){
1886
if(ret > 0 or errno != EINTR){
1422
if (ret > 0 or errno != EINTR){
1887
1423
return (ret != 1) ? ret : 0;
1888
1424
}
1889
1425
}
1890
1426
}
1891
1427
}
1892
1428
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
1895
1482
const float delay){
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1914
1488
if(numhooks == -1){
1915
perror_plus("scandir");
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1930
1496
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
1977
1504
perror_plus("asprintf");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1982
1563
free(delaystring);
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
2051
1575
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
2071
1612
}
2072
1613
2073
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2077
int ret;
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
2078
1620
struct ifreq network;
2079
1621
unsigned int if_index = if_nametoindex(interface);
2080
1622
if(if_index == 0){
2089
1631
}
2090
1632
2091
1633
if(not interface_is_up(interface)){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2094
if(not get_flags(interface, &network)){
1634
if(not get_flags(interface, &network) and debug){
2095
1635
ret_errno = errno;
2096
1636
fprintf_plus(stderr, "Failed to get flags for interface "
2097
1637
"\"%s\"\n", interface);
2098
errno = old_errno;
2099
1638
return ret_errno;
2100
1639
}
2101
network.ifr_flags |= IFF_UP; /* set flag */
1640
network.ifr_flags |= IFF_UP;
2102
1641
2103
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2104
if(sd == -1){
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
2105
1644
ret_errno = errno;
2106
1645
perror_plus("socket");
2107
1646
errno = old_errno;
2108
1647
return ret_errno;
2109
1648
}
2110
1649
2111
1650
if(quit_now){
2112
ret = close(sd);
2113
if(ret == -1){
2114
perror_plus("close");
2115
}
1651
close(sd);
2116
1652
errno = old_errno;
2117
1653
return EINTR;
2118
1654
}
2122
1658
interface);
2123
1659
}
2124
1660
2125
/* Raise privileges */
2126
ret_errno = raise_privileges();
2127
if(ret_errno != 0){
2128
errno = ret_errno;
2129
perror_plus("Failed to raise privileges");
2130
}
1661
/* Raise priviliges */
1662
raise_privileges();
2131
1663
2132
1664
#ifdef __linux__
2133
int ret_linux;
2134
bool restore_loglevel = false;
2135
if(ret_errno == 0){
2136
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2137
messages about the network interface to mess up the prompt */
2138
ret_linux = klogctl(8, NULL, 5);
2139
if(ret_linux == -1){
2140
perror_plus("klogctl");
2141
} else {
2142
restore_loglevel = true;
2143
}
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
2144
1672
}
2145
1673
#endif /* __linux__ */
2146
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2147
ioctl_errno = errno;
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
2148
1676
#ifdef __linux__
2149
1677
if(restore_loglevel){
2150
1678
ret_linux = klogctl(7, NULL, 0);
2154
1682
}
2155
1683
#endif /* __linux__ */
2156
1684
2157
/* If raise_privileges() succeeded above */
2158
if(ret_errno == 0){
2159
/* Lower privileges */
2160
ret_errno = lower_privileges();
2161
if(ret_errno != 0){
2162
errno = ret_errno;
2163
perror_plus("Failed to lower privileges");
2164
}
2165
}
1685
/* Lower privileges */
1686
lower_privileges();
2166
1687
2167
1688
/* Close the socket */
2168
ret = close(sd);
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2169
1690
if(ret == -1){
2170
1691
perror_plus("close");
2171
1692
}
2172
1693
2173
1694
if(ret_setflags == -1){
2174
errno = ioctl_errno;
1695
errno = ret_errno;
2175
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2176
1697
errno = old_errno;
2177
return ioctl_errno;
1698
return ret_errno;
2178
1699
}
2179
1700
} else if(debug){
2180
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2198
1719
return 0;
2199
1720
}
2200
1721
2201
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
2204
1727
struct ifreq network;
2205
1728
unsigned int if_index = if_nametoindex(interface);
2206
1729
if(if_index == 0){
2209
1732
return ENXIO;
2210
1733
}
2211
1734
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
2214
1735
if(not get_flags(interface, &network) and debug){
2215
1736
ret_errno = errno;
2216
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2217
1738
"\"%s\"\n", interface);
2218
errno = old_errno;
2219
1739
return ret_errno;
2220
1740
}
2221
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2222
1742
2223
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
if(sd == -1){
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
2225
1745
ret_errno = errno;
2226
1746
perror_plus("socket");
2227
1747
errno = old_errno;
2233
1753
interface);
2234
1754
}
2235
1755
2236
/* Raise privileges */
2237
ret_errno = raise_privileges();
2238
if(ret_errno != 0){
2239
errno = ret_errno;
2240
perror_plus("Failed to raise privileges");
2241
}
2242
2243
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2244
ioctl_errno = errno;
2245
2246
/* If raise_privileges() succeeded above */
2247
if(ret_errno == 0){
2248
/* Lower privileges */
2249
ret_errno = lower_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to lower privileges");
2253
}
2254
}
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
2255
1764
2256
1765
/* Close the socket */
2257
int ret = close(sd);
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
1767
if(ret == -1){
2259
1768
perror_plus("close");
2260
1769
}
2261
1770
2262
1771
if(ret_setflags == -1){
2263
errno = ioctl_errno;
1772
errno = ret_errno;
2264
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
1774
errno = old_errno;
2266
return ioctl_errno;
1775
return ret_errno;
2267
1776
}
2268
1777
} else if(debug){
2269
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2275
1784
}
2276
1785
2277
1786
int main(int argc, char *argv[]){
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
2283
1791
AvahiSServiceBrowser *sb = NULL;
2284
1792
error_t ret_errno;
2285
1793
int ret;
2288
1796
int exitcode = EXIT_SUCCESS;
2289
1797
char *interfaces_to_take_down = NULL;
2290
1798
size_t interfaces_to_take_down_size = 0;
2291
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2292
char old_tempdir[] = "/tmp/mandosXXXXXX";
2293
char *tempdir = NULL;
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1800
bool tempdir_created = false;
2294
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2295
1802
const char *seckey = PATHDIR "/" SECKEY;
2296
1803
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
2298
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
2299
1806
2300
1807
bool gnutls_initialized = false;
2301
1808
bool gpgme_initialized = false;
2353
1860
.doc = "Bit length of the prime number used in the"
2354
1861
" Diffie-Hellman key exchange",
2355
1862
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
2361
1863
{ .name = "priority", .key = 130,
2362
1864
.arg = "STRING",
2363
1865
.doc = "GnuTLS priority string for the TLS handshake",
2418
1920
}
2419
1921
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2420
1922
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
2424
1923
case 130: /* --priority */
2425
1924
mc.priority = arg;
2426
1925
break;
2466
1965
.args_doc = "",
2467
1966
.doc = "Mandos client -- Get and decrypt"
2468
1967
" passwords from a Mandos server" };
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1970
switch(ret){
2472
1971
case 0:
2473
1972
break;
2474
1973
case ENOMEM:
2475
1974
default:
2476
errno = ret_errno;
1975
errno = ret;
2477
1976
perror_plus("argp_parse");
2478
1977
exitcode = EX_OSERR;
2479
1978
goto end;
2482
1981
goto end;
2483
1982
}
2484
1983
}
2485
1984
2486
1985
{
2487
1986
/* Work around Debian bug #633582:
2488
1987
<http://bugs.debian.org/633582> */
2489
1988
2490
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2494
perror_plus("Failed to raise privileges");
2495
} else {
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
2496
1991
struct stat st;
2497
1992
2498
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
2007
}
2513
2008
}
2514
2009
}
2515
close(seckey_fd);
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2516
2011
}
2517
2012
}
2518
2013
2519
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2520
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2521
2016
if(pubkey_fd == -1){
2533
2028
}
2534
2029
}
2535
2030
}
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2562
2035
/* Lower privileges */
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2566
perror_plus("Failed to lower privileges");
2567
}
2036
lower_privileges();
2568
2037
}
2569
2038
}
2570
2039
2594
2063
goto end;
2595
2064
}
2596
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2597
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2598
}
2599
run_network_hooks("start", interfaces_hooks != NULL ?
2600
interfaces_hooks : "", delay);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2601
2074
}
2602
2075
2603
2076
if(not debug){
2681
2154
2682
2155
/* If no interfaces were specified, make a list */
2683
2156
if(mc.interfaces == NULL){
2684
struct dirent **direntries = NULL;
2157
struct dirent **direntries;
2685
2158
/* Look for any good interfaces */
2686
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2687
2160
alphasort);
2691
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2692
2165
direntries[i]->d_name);
2693
2166
if(ret_errno != 0){
2694
errno = ret_errno;
2695
2167
perror_plus("argz_add");
2696
free(direntries[i]);
2697
2168
continue;
2698
2169
}
2699
2170
if(debug){
2700
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2701
2172
direntries[i]->d_name);
2702
2173
}
2703
free(direntries[i]);
2704
2174
}
2705
2175
free(direntries);
2706
2176
} else {
2707
if(ret == 0){
2708
free(direntries);
2709
}
2177
free(direntries);
2710
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2711
2179
exitcode = EXIT_FAILURE;
2712
2180
goto end;
2713
2181
}
2714
2182
}
2715
2183
2716
/* Bring up interfaces which are down, and remove any "none"s */
2184
/* Bring up interfaces which are down */
2717
2185
{
2718
2186
char *interface = NULL;
2719
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2735
2203
break;
2736
2204
}
2737
2205
bool interface_was_up = interface_is_up(interface);
2738
errno = bring_up_interface(interface, delay);
2206
ret = bring_up_interface(interface, delay);
2739
2207
if(not interface_was_up){
2740
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2743
2211
} else {
2744
errno = argz_add(&interfaces_to_take_down,
2745
&interfaces_to_take_down_size,
2746
interface);
2747
if(errno != 0){
2748
perror_plus("argz_add");
2749
}
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2750
2215
}
2751
2216
}
2752
2217
}
2768
2233
goto end;
2769
2234
}
2770
2235
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2772
2237
if(ret == -1){
2773
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2774
2239
exitcode = EX_UNAVAILABLE;
2781
2246
goto end;
2782
2247
}
2783
2248
2784
/* Try /run/tmp before /tmp */
2785
tempdir = mkdtemp(run_tempdir);
2786
if(tempdir == NULL and errno == ENOENT){
2787
if(debug){
2788
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2789
run_tempdir, old_tempdir);
2790
}
2791
tempdir = mkdtemp(old_tempdir);
2792
}
2793
if(tempdir == NULL){
2249
if(mkdtemp(tempdir) == NULL){
2794
2250
perror_plus("mkdtemp");
2795
2251
goto end;
2796
2252
}
2253
tempdir_created = true;
2797
2254
2798
2255
if(quit_now){
2799
2256
goto end;
2871
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2872
2329
(int)retry_interval);
2873
2330
}
2874
sleep((unsigned int)retry_interval);
2331
sleep((int)retry_interval);
2875
2332
}
2876
2333
2877
if(not quit_now){
2334
if (not quit_now){
2878
2335
exitcode = EXIT_SUCCESS;
2879
2336
}
2880
2337
2896
2353
2897
2354
/* Allocate a new server */
2898
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
2356
&config, NULL, NULL, &ret_errno);
2900
2357
2901
2358
/* Free the Avahi configuration data */
2902
2359
avahi_server_config_free(&config);
2905
2362
/* Check if creating the Avahi server object succeeded */
2906
2363
if(mc.server == NULL){
2907
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2908
avahi_strerror(ret));
2365
avahi_strerror(ret_errno));
2909
2366
exitcode = EX_UNAVAILABLE;
2910
2367
goto end;
2911
2368
}
2935
2392
if(debug){
2936
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2937
2394
}
2938
2395
2939
2396
ret = avahi_loop_with_timeout(simple_poll,
2940
2397
(int)(retry_interval * 1000), &mc);
2941
2398
if(debug){
2963
2420
2964
2421
if(gnutls_initialized){
2965
2422
gnutls_certificate_free_credentials(mc.cred);
2423
gnutls_global_deinit();
2966
2424
gnutls_dh_params_deinit(mc.dh_params);
2967
2425
}
2968
2426
2976
2434
mc.current_server->prev->next = NULL;
2977
2435
while(mc.current_server != NULL){
2978
2436
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2987
2437
free(mc.current_server);
2988
2438
mc.current_server = next;
2989
2439
}
2990
2440
}
2991
2441
2992
/* Re-raise privileges */
2442
/* Re-raise priviliges */
2993
2443
{
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2997
perror_plus("Failed to raise privileges");
2998
} else {
2999
3000
/* Run network hooks */
3001
run_network_hooks("stop", interfaces_hooks != NULL ?
3002
interfaces_hooks : "", delay);
3003
3004
/* Take down the network interfaces which were brought up */
3005
{
3006
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3013
perror_plus("Failed to take down interface");
3014
}
3015
}
3016
if(debug and (interfaces_to_take_down == NULL)){
3017
fprintf_plus(stderr, "No interfaces needed to be taken"
3018
" down\n");
3019
}
3020
}
3021
}
3022
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3026
perror_plus("Failed to lower privileges permanently");
3027
}
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2460
}
2461
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2465
}
2466
}
2467
2468
lower_privileges_permanently();
3028
2469
}
3029
2470
3030
2471
free(interfaces_to_take_down);
3031
2472
free(interfaces_hooks);
3032
2473
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
2474
/* Removes the GPGME temp directory and all files inside */
2475
if(tempdir_created){
3035
2476
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
3048
2481
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
3089
/* Removes the GPGME temp directory and all files inside */
3090
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
2482
direntry = direntries[i];
2483
char *fullname = NULL;
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
2485
direntry->d_name);
2486
if(ret < 0){
2487
perror_plus("asprintf");
2488
continue;
2489
}
2490
ret = remove(fullname);
2491
if(ret == -1){
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2494
}
2495
free(fullname);
2496
}
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
2503
}
2504
ret = rmdir(tempdir);
2505
if(ret == -1 and errno != ENOENT){
2506
perror_plus("rmdir");
2507
}
3092
2508
}
3093
2509
3094
2510
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0