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- Committer: Teddy Hogeborn
- Date: 2016-07-03 03:28:57 UTC
- Revision ID: teddy@recompile.se-20160703032857-ss0r9fgv5a0r2u2o
Update old GnuTLS link in mandos-client(8mandos).
* plugins.d/mandos-client.xml (SEE ALSO): Update old GnuTLS link.
* plugins.d/mandos-client.xml (SEE ALSO): Update old GnuTLS link.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
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
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
65
70
program_invocation_short_name */
66
71
#include <time.h> /* nanosleep(), time(), sleep() */
67
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
77
*/
73
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
79
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
77
83
#include <iso646.h> /* not, or, and */
78
84
#include <argp.h> /* struct argp_option, error_t, struct
79
85
argp_state, struct argp,
91
97
argz_delete(), argz_append(),
92
98
argz_stringify(), argz_add(),
93
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
94
102
95
103
#ifdef __linux__
96
104
#include <sys/klog.h> /* klogctl() */
138
146
static const char sys_class_net[] = "/sys/class/net";
139
147
char *connect_to = NULL;
140
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
141
150
uid_t uid = 65534;
142
151
gid_t gid = 65534;
143
152
180
189
perror(print_text);
181
190
}
182
191
183
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
193
int fprintf_plus(FILE *stream, const char *format, ...){
185
194
va_list ap;
186
195
va_start (ap, format);
187
196
188
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
198
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
200
}
192
201
193
202
/*
195
204
* bytes. "buffer_capacity" is how much is currently allocated,
196
205
* "buffer_length" is how much is already used.
197
206
*/
207
__attribute__((nonnull, warn_unused_result))
198
208
size_t incbuffer(char **buffer, size_t buffer_length,
199
209
size_t buffer_capacity){
200
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
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;
203
217
return 0;
204
218
}
219
*buffer = new_buf;
205
220
buffer_capacity += BUFFER_SIZE;
206
221
}
207
222
return buffer_capacity;
208
223
}
209
224
210
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
211
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
228
int af, server **current_server){
213
229
int ret;
222
238
.af = af };
223
239
if(new_server->ip == NULL){
224
240
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);
225
256
return false;
226
257
}
227
258
/* Special case of first server */
229
260
new_server->next = new_server;
230
261
new_server->prev = new_server;
231
262
*current_server = new_server;
232
/* Place the new server last in the list */
233
263
} else {
264
/* Place the new server last in the list */
234
265
new_server->next = *current_server;
235
266
new_server->prev = (*current_server)->prev;
236
267
new_server->prev->next = new_server;
237
268
(*current_server)->prev = new_server;
238
269
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
270
return true;
245
271
}
246
272
247
273
/*
248
274
* Initialize GPGME.
249
275
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
252
281
gpgme_error_t rc;
253
282
gpgme_engine_info_t engine_info;
254
283
255
284
/*
256
285
* Helper function to insert pub and seckey to the engine keyring.
257
286
*/
258
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
259
288
int ret;
260
289
int fd;
261
290
gpgme_data_t pgp_data;
280
309
return false;
281
310
}
282
311
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
284
313
if(ret == -1){
285
314
perror_plus("close");
286
315
}
342
371
* Decrypt OpenPGP data.
343
372
* Returns -1 on error
344
373
*/
374
__attribute__((nonnull, warn_unused_result))
345
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
376
size_t crypto_size,
347
377
char **plaintext,
467
497
return plaintext_length;
468
498
}
469
499
470
static const char * safer_gnutls_strerror(int value){
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
471
509
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
510
return safe_string(ret);
475
511
}
476
512
477
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
478
515
static void debuggnutls(__attribute__((unused)) int level,
479
516
const char* string){
480
517
fprintf_plus(stderr, "GnuTLS: %s", string);
481
518
}
482
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
521
static int init_gnutls_global(const char *pubkeyfilename,
484
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
485
524
mandos_context *mc){
486
525
int ret;
526
unsigned int uret;
487
527
488
528
if(debug){
489
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
530
}
491
531
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
499
532
if(debug){
500
533
/* "Use a log level over 10 to enable all debugging options."
501
534
* - GnuTLS manual
509
542
if(ret != GNUTLS_E_SUCCESS){
510
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
544
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
545
return -1;
514
546
}
515
547
540
572
safer_gnutls_strerror(ret));
541
573
goto globalfail;
542
574
}
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
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
}
550
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
748
552
749
return 0;
554
751
globalfail:
555
752
556
753
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
754
gnutls_dh_params_deinit(mc->dh_params);
559
755
return -1;
560
756
}
561
757
758
__attribute__((nonnull, warn_unused_result))
562
759
static int init_gnutls_session(gnutls_session_t *session,
563
760
mandos_context *mc){
564
761
int ret;
611
808
/* ignore client certificate if any. */
612
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
810
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
811
return 0;
617
812
}
618
813
620
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
816
__attribute__((unused)) const char *txt){}
622
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
623
1036
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
624
1038
static int start_mandos_communication(const char *ip, in_port_t port,
625
1039
AvahiIfIndex if_index,
626
1040
int af, mandos_context *mc){
627
1041
int ret, tcp_sd = -1;
628
1042
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1043
struct sockaddr_storage to;
633
1044
char *buffer = NULL;
634
1045
char *decrypted_buffer = NULL;
635
1046
size_t buffer_length = 0;
638
1049
int retval = -1;
639
1050
gnutls_session_t session;
640
1051
int pf; /* Protocol family */
1052
bool route_added = false;
641
1053
642
1054
errno = 0;
643
1055
701
1113
PRIuMAX "\n", ip, (uintmax_t)port);
702
1114
}
703
1115
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
705
1117
if(tcp_sd < 0){
706
1118
int e = errno;
707
1119
perror_plus("socket");
714
1126
goto mandos_end;
715
1127
}
716
1128
717
memset(&to, 0, sizeof(to));
718
1129
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
721
1133
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
724
1137
}
725
1138
if(ret < 0 ){
726
1139
int e = errno;
735
1148
goto mandos_end;
736
1149
}
737
1150
if(af == AF_INET6){
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*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
1154
if(if_index == AVAHI_IF_UNSPEC){
743
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
744
1156
" incomplete without a network interface\n");
746
1158
goto mandos_end;
747
1159
}
748
1160
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
1162
}
751
1163
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
1165
}
756
1166
757
1167
if(quit_now){
774
1184
}
775
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
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;
816
1267
}
817
1268
818
1269
const char *out = mandos_protocol_version;
972
1423
&decrypted_buffer, mc);
973
1424
if(decrypted_buffer_size >= 0){
974
1425
1426
clearerr(stdout);
975
1427
written = 0;
976
1428
while(written < (size_t) decrypted_buffer_size){
977
1429
if(quit_now){
993
1445
}
994
1446
written += (size_t)ret;
995
1447
}
1448
ret = fflush(stdout);
1449
if(ret != 0){
1450
int e = errno;
1451
if(debug){
1452
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1453
strerror(errno));
1454
}
1455
errno = e;
1456
goto mandos_end;
1457
}
996
1458
retval = 0;
997
1459
}
998
1460
}
1001
1463
1002
1464
mandos_end:
1003
1465
{
1466
if(route_added){
1467
if(not delete_local_route(ip, if_index)){
1468
fprintf_plus(stderr, "Failed to delete local route to %s on"
1469
" interface %d", ip, if_index);
1470
}
1471
}
1004
1472
int e = errno;
1005
1473
free(decrypted_buffer);
1006
1474
free(buffer);
1007
1475
if(tcp_sd >= 0){
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1476
ret = close(tcp_sd);
1009
1477
}
1010
1478
if(ret == -1){
1011
1479
if(e == 0){
1023
1491
return retval;
1024
1492
}
1025
1493
1494
__attribute__((nonnull))
1026
1495
static void resolve_callback(AvahiSServiceResolver *r,
1027
1496
AvahiIfIndex interface,
1028
1497
AvahiProtocol proto,
1036
1505
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1506
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1507
flags,
1039
void* mc){
1508
void *mc){
1040
1509
if(r == NULL){
1041
1510
return;
1042
1511
}
1045
1514
timed out */
1046
1515
1047
1516
if(quit_now){
1517
avahi_s_service_resolver_free(r);
1048
1518
return;
1049
1519
}
1050
1520
1095
1565
const char *domain,
1096
1566
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1567
flags,
1098
void* mc){
1568
void *mc){
1099
1569
if(b == NULL){
1100
1570
return;
1101
1571
}
1161
1631
errno = old_errno;
1162
1632
}
1163
1633
1634
__attribute__((nonnull, warn_unused_result))
1164
1635
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1636
int ret;
1166
error_t ret_errno;
1637
int old_errno;
1167
1638
1168
1639
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1640
if(s < 0){
1170
ret_errno = errno;
1641
old_errno = errno;
1171
1642
perror_plus("socket");
1172
errno = ret_errno;
1643
errno = old_errno;
1173
1644
return false;
1174
1645
}
1175
strcpy(ifr->ifr_name, ifname);
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1176
1648
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1649
if(ret == -1){
1178
1650
if(debug){
1179
ret_errno = errno;
1651
old_errno = errno;
1180
1652
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1653
errno = old_errno;
1182
1654
}
1183
1655
return false;
1184
1656
}
1185
1657
return true;
1186
1658
}
1187
1659
1660
__attribute__((nonnull, warn_unused_result))
1188
1661
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1662
1190
1663
/* Reject the loopback device */
1232
1705
* corresponds to an acceptable network device.
1233
1706
* (This function is passed to scandir(3) as a filter function.)
1234
1707
*/
1708
__attribute__((nonnull, warn_unused_result))
1235
1709
int good_interface(const struct dirent *if_entry){
1236
1710
if(if_entry->d_name[0] == '.'){
1237
1711
return 0;
1255
1729
/*
1256
1730
* This function determines if a network interface is up.
1257
1731
*/
1732
__attribute__((nonnull, warn_unused_result))
1258
1733
bool interface_is_up(const char *interface){
1259
1734
struct ifreq ifr;
1260
1735
if(not get_flags(interface, &ifr)){
1271
1746
/*
1272
1747
* This function determines if a network interface is running
1273
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1274
1750
bool interface_is_running(const char *interface){
1275
1751
struct ifreq ifr;
1276
1752
if(not get_flags(interface, &ifr)){
1284
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1761
}
1286
1762
1763
__attribute__((nonnull, pure, warn_unused_result))
1287
1764
int notdotentries(const struct dirent *direntry){
1288
1765
/* Skip "." and ".." */
1289
1766
if(direntry->d_name[0] == '.'
1296
1773
}
1297
1774
1298
1775
/* Is this directory entry a runnable program? */
1776
__attribute__((nonnull, warn_unused_result))
1299
1777
int runnable_hook(const struct dirent *direntry){
1300
1778
int ret;
1301
1779
size_t sret;
1309
1787
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1788
"abcdefghijklmnopqrstuvwxyz"
1311
1789
"0123456789"
1312
"_-");
1790
"_.-");
1313
1791
if((direntry->d_name)[sret] != '\0'){
1314
1792
/* Contains non-allowed characters */
1315
1793
if(debug){
1319
1797
return 0;
1320
1798
}
1321
1799
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);
1800
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1330
1801
if(ret == -1){
1331
1802
if(debug){
1332
1803
perror_plus("Could not stat hook");
1356
1827
return 1;
1357
1828
}
1358
1829
1830
__attribute__((nonnull, warn_unused_result))
1359
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1832
mandos_context *mc){
1361
1833
int ret;
1365
1837
1366
1838
while(true){
1367
1839
if(mc->current_server == NULL){
1368
if (debug){
1840
if(debug){
1369
1841
fprintf_plus(stderr, "Wait until first server is found."
1370
1842
" No timeout!\n");
1371
1843
}
1372
1844
ret = avahi_simple_poll_iterate(s, -1);
1373
1845
} else {
1374
if (debug){
1846
if(debug){
1375
1847
fprintf_plus(stderr, "Check current_server if we should run"
1376
1848
" it, or wait\n");
1377
1849
}
1394
1866
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1867
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1868
1397
if (debug){
1869
if(debug){
1398
1870
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1871
block_time);
1400
1872
}
1422
1894
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1895
}
1424
1896
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1897
if(ret > 0 or errno != EINTR){
1426
1898
return (ret != 1) ? ret : 0;
1427
1899
}
1428
1900
}
1429
1901
}
1430
1902
}
1431
1903
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,
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1485
1906
const float delay){
1486
struct dirent **direntries;
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1910
| O_CLOEXEC);
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1913
if(debug){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1916
}
1917
} else {
1918
perror_plus("open");
1919
}
1920
return;
1921
}
1922
}
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1925
if(numhooks == -1){
1926
perror_plus("scandir");
1927
return;
1928
}
1487
1929
struct dirent *direntry;
1488
1930
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
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");
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1932
if(devnull == -1){
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1934
return;
1935
}
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1938
if(debug){
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1940
direntry->d_name);
1499
1941
}
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){
1942
pid_t hook_pid = fork();
1943
if(hook_pid == 0){
1944
/* Child */
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1947
if(errno != 0){
1948
perror_plus("Failed to raise privileges");
1949
_exit(EX_NOPERM);
1950
}
1951
/* Set group */
1952
errno = 0;
1953
ret = setgid(0);
1954
if(ret == -1){
1955
perror_plus("setgid");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Reset supplementary groups */
1959
errno = 0;
1960
ret = setgroups(0, NULL);
1961
if(ret == -1){
1962
perror_plus("setgroups");
1963
_exit(EX_NOPERM);
1964
}
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
ret = setenv("DEVICE", interface, 1);
1971
if(ret == -1){
1972
perror_plus("setenv");
1973
_exit(EX_OSERR);
1974
}
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1976
if(ret == -1){
1977
perror_plus("setenv");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("MODE", mode, 1);
1981
if(ret == -1){
1982
perror_plus("setenv");
1983
_exit(EX_OSERR);
1984
}
1985
char *delaystring;
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1987
if(ret == -1){
1507
1988
perror_plus("asprintf");
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
}
1989
_exit(EX_OSERR);
1990
}
1991
ret = setenv("DELAY", delaystring, 1);
1992
if(ret == -1){
1566
1993
free(delaystring);
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
}
1994
perror_plus("setenv");
1995
_exit(EX_OSERR);
1996
}
1997
free(delaystring);
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2000
if(ret == -1){
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
}
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2006
direntry->d_name,
2007
O_RDONLY));
2008
if(hook_fd == -1){
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2011
}
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2015
}
2016
ret = dup2(devnull, STDIN_FILENO);
2017
if(ret == -1){
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2019
_exit(EX_OSERR);
2020
}
2021
ret = close(devnull);
2022
if(ret == -1){
2023
perror_plus("close");
2024
_exit(EX_OSERR);
2025
}
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2027
if(ret == -1){
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2029
_exit(EX_OSERR);
2030
}
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2032
environ) == -1){
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2035
}
2036
} else {
2037
if(hook_pid == -1){
2038
perror_plus("fork");
2039
free(direntry);
2040
continue;
2041
}
2042
int status;
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2045
free(direntry);
2046
continue;
2047
}
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2053
free(direntry);
2054
continue;
2055
}
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2059
WTERMSIG(status));
2060
free(direntry);
2061
continue;
1578
2062
} else {
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;
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2065
free(direntry);
2066
continue;
2067
}
2068
}
2069
if(debug){
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2071
direntry->d_name);
2072
}
2073
free(direntry);
2074
}
2075
free(direntries);
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2078
} else {
2079
hookdir_fd = -1;
2080
}
2081
close(devnull);
1615
2082
}
1616
2083
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;
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2086
const float delay){
2087
int old_errno = errno;
2088
int ret;
1623
2089
struct ifreq network;
1624
2090
unsigned int if_index = if_nametoindex(interface);
1625
2091
if(if_index == 0){
1634
2100
}
1635
2101
1636
2102
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
2103
int ret_errno = 0;
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
1638
2106
ret_errno = errno;
1639
2107
fprintf_plus(stderr, "Failed to get flags for interface "
1640
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
1641
2110
return ret_errno;
1642
2111
}
1643
network.ifr_flags |= IFF_UP;
2112
network.ifr_flags |= IFF_UP; /* set flag */
1644
2113
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
1647
2116
ret_errno = errno;
1648
2117
perror_plus("socket");
1649
2118
errno = old_errno;
1650
2119
return ret_errno;
1651
2120
}
1652
2121
1653
2122
if(quit_now){
1654
close(sd);
2123
ret = close(sd);
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
1655
2127
errno = old_errno;
1656
2128
return EINTR;
1657
2129
}
1661
2133
interface);
1662
2134
}
1663
2135
1664
/* Raise priviliges */
1665
raise_privileges();
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
1666
2142
1667
2143
#ifdef __linux__
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");
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
1675
2155
}
1676
2156
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
1679
2159
#ifdef __linux__
1680
2160
if(restore_loglevel){
1681
2161
ret_linux = klogctl(7, NULL, 0);
1685
2165
}
1686
2166
#endif /* __linux__ */
1687
2167
1688
/* Lower privileges */
1689
lower_privileges();
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
1690
2177
1691
2178
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2179
ret = close(sd);
1693
2180
if(ret == -1){
1694
2181
perror_plus("close");
1695
2182
}
1696
2183
1697
2184
if(ret_setflags == -1){
1698
errno = ret_errno;
2185
errno = ioctl_errno;
1699
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
2187
errno = old_errno;
1701
return ret_errno;
2188
return ioctl_errno;
1702
2189
}
1703
2190
} else if(debug){
1704
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1722
2209
return 0;
1723
2210
}
1724
2211
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;
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
1730
2215
struct ifreq network;
1731
2216
unsigned int if_index = if_nametoindex(interface);
1732
2217
if(if_index == 0){
1735
2220
return ENXIO;
1736
2221
}
1737
2222
if(interface_is_up(interface)){
2223
int ret_errno = 0;
2224
int ioctl_errno = 0;
1738
2225
if(not get_flags(interface, &network) and debug){
1739
2226
ret_errno = errno;
1740
2227
fprintf_plus(stderr, "Failed to get flags for interface "
1741
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
1742
2230
return ret_errno;
1743
2231
}
1744
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
2233
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
1748
2236
ret_errno = errno;
1749
2237
perror_plus("socket");
1750
2238
errno = old_errno;
1756
2244
interface);
1757
2245
}
1758
2246
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();
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
1767
2266
1768
2267
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
int ret = close(sd);
1770
2269
if(ret == -1){
1771
2270
perror_plus("close");
1772
2271
}
1773
2272
1774
2273
if(ret_setflags == -1){
1775
errno = ret_errno;
2274
errno = ioctl_errno;
1776
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
2276
errno = old_errno;
1778
return ret_errno;
2277
return ioctl_errno;
1779
2278
}
1780
2279
} else if(debug){
1781
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
2286
}
1788
2287
1789
2288
int main(int argc, char *argv[]){
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 };
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.interfaces_size = 0 };
1794
2294
AvahiSServiceBrowser *sb = NULL;
1795
2295
error_t ret_errno;
1796
2296
int ret;
1799
2299
int exitcode = EXIT_SUCCESS;
1800
2300
char *interfaces_to_take_down = NULL;
1801
2301
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
1804
2305
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
2306
const char *seckey = PATHDIR "/" SECKEY;
1806
2307
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
1807
2309
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
2310
1810
2311
bool gnutls_initialized = false;
1811
2312
bool gpgme_initialized = false;
1863
2364
.doc = "Bit length of the prime number used in the"
1864
2365
" Diffie-Hellman key exchange",
1865
2366
.group = 2 },
2367
{ .name = "dh-params", .key = 134,
2368
.arg = "FILE",
2369
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2370
" for the Diffie-Hellman key exchange",
2371
.group = 2 },
1866
2372
{ .name = "priority", .key = 130,
1867
2373
.arg = "STRING",
1868
2374
.doc = "GnuTLS priority string for the TLS handshake",
1923
2429
}
1924
2430
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1925
2431
break;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2434
break;
1926
2435
case 130: /* --priority */
1927
2436
mc.priority = arg;
1928
2437
break;
1968
2477
.args_doc = "",
1969
2478
.doc = "Mandos client -- Get and decrypt"
1970
2479
" passwords from a Mandos server" };
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2480
ret_errno = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2482
switch(ret_errno){
1974
2483
case 0:
1975
2484
break;
1976
2485
case ENOMEM:
1977
2486
default:
1978
errno = ret;
2487
errno = ret_errno;
1979
2488
perror_plus("argp_parse");
1980
2489
exitcode = EX_OSERR;
1981
2490
goto end;
1984
2493
goto end;
1985
2494
}
1986
2495
}
1987
2496
1988
2497
{
1989
2498
/* Work around Debian bug #633582:
1990
2499
<http://bugs.debian.org/633582> */
1991
2500
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2501
/* Re-raise privileges */
2502
ret = raise_privileges();
2503
if(ret != 0){
2504
errno = ret;
2505
perror_plus("Failed to raise privileges");
2506
} else {
1994
2507
struct stat st;
1995
2508
1996
2509
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2010
2523
}
2011
2524
}
2012
2525
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2526
close(seckey_fd);
2014
2527
}
2015
2528
}
2016
2529
2017
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
2531
int pubkey_fd = open(pubkey, O_RDONLY);
2019
2532
if(pubkey_fd == -1){
2031
2544
}
2032
2545
}
2033
2546
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2547
close(pubkey_fd);
2548
}
2549
}
2550
2551
if(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2556
} else {
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2558
if(ret == -1){
2559
perror_plus("fstat");
2560
} else {
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2564
if(ret == -1){
2565
perror_plus("fchown");
2566
}
2567
}
2568
}
2569
close(dhparams_fd);
2570
}
2571
}
2572
2038
2573
/* Lower privileges */
2039
lower_privileges();
2574
ret = lower_privileges();
2575
if(ret != 0){
2576
errno = ret;
2577
perror_plus("Failed to lower privileges");
2578
}
2040
2579
}
2041
2580
}
2042
2581
2066
2605
goto end;
2067
2606
}
2068
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
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
}
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2609
}
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
2077
2612
}
2078
2613
2079
2614
if(not debug){
2157
2692
2158
2693
/* If no interfaces were specified, make a list */
2159
2694
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2695
struct dirent **direntries = NULL;
2161
2696
/* Look for any good interfaces */
2162
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2163
2698
alphasort);
2167
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2703
direntries[i]->d_name);
2169
2704
if(ret_errno != 0){
2705
errno = ret_errno;
2170
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2171
2708
continue;
2172
2709
}
2173
2710
if(debug){
2174
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
2712
direntries[i]->d_name);
2176
2713
}
2714
free(direntries[i]);
2177
2715
}
2178
2716
free(direntries);
2179
2717
} else {
2180
free(direntries);
2718
if(ret == 0){
2719
free(direntries);
2720
}
2181
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2182
2722
exitcode = EXIT_FAILURE;
2183
2723
goto end;
2206
2746
break;
2207
2747
}
2208
2748
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2749
errno = bring_up_interface(interface, delay);
2210
2750
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2751
if(errno != 0){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2214
2754
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2757
interface);
2758
if(errno != 0){
2759
perror_plus("argz_add");
2760
}
2218
2761
}
2219
2762
}
2220
2763
}
2236
2779
goto end;
2237
2780
}
2238
2781
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2240
2783
if(ret == -1){
2241
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2785
exitcode = EX_UNAVAILABLE;
2249
2792
goto end;
2250
2793
}
2251
2794
2252
if(mkdtemp(tempdir) == NULL){
2795
/* Try /run/tmp before /tmp */
2796
tempdir = mkdtemp(run_tempdir);
2797
if(tempdir == NULL and errno == ENOENT){
2798
if(debug){
2799
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2800
run_tempdir, old_tempdir);
2801
}
2802
tempdir = mkdtemp(old_tempdir);
2803
}
2804
if(tempdir == NULL){
2253
2805
perror_plus("mkdtemp");
2254
2806
goto end;
2255
2807
}
2256
tempdir_created = true;
2257
2808
2258
2809
if(quit_now){
2259
2810
goto end;
2334
2885
sleep((unsigned int)retry_interval);
2335
2886
}
2336
2887
2337
if (not quit_now){
2888
if(not quit_now){
2338
2889
exitcode = EXIT_SUCCESS;
2339
2890
}
2340
2891
2356
2907
2357
2908
/* Allocate a new server */
2358
2909
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2910
&config, NULL, NULL, &ret);
2360
2911
2361
2912
/* Free the Avahi configuration data */
2362
2913
avahi_server_config_free(&config);
2365
2916
/* Check if creating the Avahi server object succeeded */
2366
2917
if(mc.server == NULL){
2367
2918
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2919
avahi_strerror(ret));
2369
2920
exitcode = EX_UNAVAILABLE;
2370
2921
goto end;
2371
2922
}
2395
2946
if(debug){
2396
2947
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
2948
}
2398
2949
2399
2950
ret = avahi_loop_with_timeout(simple_poll,
2400
2951
(int)(retry_interval * 1000), &mc);
2401
2952
if(debug){
2423
2974
2424
2975
if(gnutls_initialized){
2425
2976
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2427
2977
gnutls_dh_params_deinit(mc.dh_params);
2428
2978
}
2429
2979
2437
2987
mc.current_server->prev->next = NULL;
2438
2988
while(mc.current_server != NULL){
2439
2989
server *next = mc.current_server->next;
2990
#ifdef __GNUC__
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2993
#endif
2994
free((char *)(mc.current_server->ip));
2995
#ifdef __GNUC__
2996
#pragma GCC diagnostic pop
2997
#endif
2440
2998
free(mc.current_server);
2441
2999
mc.current_server = next;
2442
3000
}
2443
3001
}
2444
3002
2445
/* Re-raise priviliges */
3003
/* Re-raise privileges */
2446
3004
{
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();
3005
ret = raise_privileges();
3006
if(ret != 0){
3007
errno = ret;
3008
perror_plus("Failed to raise privileges");
3009
} else {
3010
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3014
3015
/* Take down the network interfaces which were brought up */
3016
{
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3020
interface))){
3021
ret = take_down_interface(interface);
3022
if(ret != 0){
3023
errno = ret;
3024
perror_plus("Failed to take down interface");
3025
}
3026
}
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
3029
" down\n");
3030
}
3031
}
3032
}
3033
3034
ret = lower_privileges_permanently();
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to lower privileges permanently");
3038
}
2472
3039
}
2473
3040
2474
3041
free(interfaces_to_take_down);
2475
3042
free(interfaces_hooks);
2476
3043
3044
void clean_dir_at(int base, const char * const dirname,
3045
uintmax_t level){
3046
struct dirent **direntries = NULL;
3047
int dret;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3049
O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(dir_fd == -1){
3054
perror_plus("open");
3055
}
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
3059
for(int i = 0; i < numentries; i++){
3060
if(debug){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3063
}
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3065
if(dret == -1){
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3068
AT_REMOVEDIR);
3069
}
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3075
dret = 0;
3076
}
3077
if(dret == -1){
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3080
}
3081
}
3082
free(direntries[i]);
3083
}
3084
3085
/* need to clean even if 0 because man page doesn't specify */
3086
free(direntries);
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3089
}
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3093
}
3094
} else {
3095
perror_plus("scandirat");
3096
}
3097
close(dir_fd);
3098
}
3099
2477
3100
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2479
struct dirent **direntries = NULL;
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
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
}
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
2511
3103
}
2512
3104
2513
3105
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0