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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:25:46 UTC
- Revision ID: teddy@recompile.se-20120616232546-dcrkmnhd4yhq6mvd
* plugins.d/mandos-client (mandos_context): Moved to inside "main()".
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 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
170
161
const char *priority;
171
162
gpgme_ctx_t ctx;
172
163
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
175
164
} mandos_context;
176
165
177
166
/* global so signal handler can reach it*/
189
178
perror(print_text);
190
179
}
191
180
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
__attribute__((format (gnu_printf, 2, 3)))
193
182
int fprintf_plus(FILE *stream, const char *format, ...){
194
183
va_list ap;
195
184
va_start (ap, format);
196
185
197
186
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
187
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
189
}
201
190
202
191
/*
204
193
* bytes. "buffer_capacity" is how much is currently allocated,
205
194
* "buffer_length" is how much is already used.
206
195
*/
207
__attribute__((nonnull, warn_unused_result))
208
196
size_t incbuffer(char **buffer, size_t buffer_length,
209
197
size_t buffer_capacity){
210
198
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;
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
if(buffer == NULL){
217
201
return 0;
218
202
}
219
*buffer = new_buf;
220
203
buffer_capacity += BUFFER_SIZE;
221
204
}
222
205
return buffer_capacity;
223
206
}
224
207
225
208
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
210
int af, server **current_server){
229
211
int ret;
238
220
.af = af };
239
221
if(new_server->ip == NULL){
240
222
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
223
return false;
257
224
}
258
225
/* Special case of first server */
260
227
new_server->next = new_server;
261
228
new_server->prev = new_server;
262
229
*current_server = new_server;
230
/* Place the new server last in the list */
263
231
} else {
264
/* Place the new server last in the list */
265
232
new_server->next = *current_server;
266
233
new_server->prev = (*current_server)->prev;
267
234
new_server->prev->next = new_server;
268
235
(*current_server)->prev = new_server;
269
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
270
242
return true;
271
243
}
272
244
273
245
/*
274
246
* Initialize GPGME.
275
247
*/
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){
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
281
250
gpgme_error_t rc;
282
251
gpgme_engine_info_t engine_info;
283
252
284
253
/*
285
254
* Helper function to insert pub and seckey to the engine keyring.
286
255
*/
287
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
288
257
int ret;
289
258
int fd;
290
259
gpgme_data_t pgp_data;
309
278
return false;
310
279
}
311
280
312
ret = close(fd);
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
282
if(ret == -1){
314
283
perror_plus("close");
315
284
}
371
340
* Decrypt OpenPGP data.
372
341
* Returns -1 on error
373
342
*/
374
__attribute__((nonnull, warn_unused_result))
375
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
344
size_t crypto_size,
377
345
char **plaintext,
497
465
return plaintext_length;
498
466
}
499
467
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){
468
static const char * safer_gnutls_strerror(int value){
509
469
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
511
473
}
512
474
513
475
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
476
static void debuggnutls(__attribute__((unused)) int level,
516
477
const char* string){
517
478
fprintf_plus(stderr, "GnuTLS: %s", string);
518
479
}
519
480
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
481
static int init_gnutls_global(const char *pubkeyfilename,
522
482
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
483
mandos_context *mc){
525
484
int ret;
526
unsigned int uret;
527
485
528
486
if(debug){
529
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
488
}
531
489
490
ret = gnutls_global_init();
491
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
494
return -1;
495
}
496
532
497
if(debug){
533
498
/* "Use a log level over 10 to enable all debugging options."
534
499
* - GnuTLS manual
542
507
if(ret != GNUTLS_E_SUCCESS){
543
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
509
safer_gnutls_strerror(ret));
510
gnutls_global_deinit();
545
511
return -1;
546
512
}
547
513
572
538
safer_gnutls_strerror(ret));
573
539
goto globalfail;
574
540
}
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
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
545
goto globalfail;
546
}
547
747
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
748
549
749
550
return 0;
751
552
globalfail:
752
553
753
554
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_global_deinit();
754
556
gnutls_dh_params_deinit(mc->dh_params);
755
557
return -1;
756
558
}
757
559
758
__attribute__((nonnull, warn_unused_result))
759
560
static int init_gnutls_session(gnutls_session_t *session,
760
561
mandos_context *mc){
761
562
int ret;
808
609
/* ignore client certificate if any. */
809
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
611
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
613
811
614
return 0;
812
615
}
813
616
815
618
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
619
__attribute__((unused)) const char *txt){}
817
620
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
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
621
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
622
static int start_mandos_communication(const char *ip, in_port_t port,
1039
623
AvahiIfIndex if_index,
1040
624
int af, mandos_context *mc){
1041
625
int ret, tcp_sd = -1;
1042
626
ssize_t sret;
1043
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1044
631
char *buffer = NULL;
1045
632
char *decrypted_buffer = NULL;
1046
633
size_t buffer_length = 0;
1049
636
int retval = -1;
1050
637
gnutls_session_t session;
1051
638
int pf; /* Protocol family */
1052
bool route_added = false;
1053
639
1054
640
errno = 0;
1055
641
1071
657
return -1;
1072
658
}
1073
659
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
660
ret = init_gnutls_session(&session, mc);
1107
661
if(ret != 0){
1108
662
return -1;
1113
667
PRIuMAX "\n", ip, (uintmax_t)port);
1114
668
}
1115
669
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
671
if(tcp_sd < 0){
1118
672
int e = errno;
1119
673
perror_plus("socket");
1126
680
goto mandos_end;
1127
681
}
1128
682
683
memset(&to, 0, sizeof(to));
1129
684
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);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
687
} 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);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
690
}
1138
691
if(ret < 0 ){
1139
692
int e = errno;
1148
701
goto mandos_end;
1149
702
}
1150
703
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)){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1154
708
if(if_index == AVAHI_IF_UNSPEC){
1155
709
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
710
" incomplete without a network interface\n");
1158
712
goto mandos_end;
1159
713
}
1160
714
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
716
}
1163
717
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1165
721
}
1166
722
1167
723
if(quit_now){
1184
740
}
1185
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
742
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;
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
1267
782
}
1268
783
1269
784
const char *out = mandos_protocol_version;
1452
967
1453
968
mandos_end:
1454
969
{
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
970
int e = errno;
1462
971
free(decrypted_buffer);
1463
972
free(buffer);
1464
973
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
975
}
1467
976
if(ret == -1){
1468
977
if(e == 0){
1480
989
return retval;
1481
990
}
1482
991
1483
__attribute__((nonnull))
1484
992
static void resolve_callback(AvahiSServiceResolver *r,
1485
993
AvahiIfIndex interface,
1486
994
AvahiProtocol proto,
1494
1002
AVAHI_GCC_UNUSED AvahiStringList *txt,
1495
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
1004
flags,
1497
void *mc){
1005
void* mc){
1498
1006
if(r == NULL){
1499
1007
return;
1500
1008
}
1503
1011
timed out */
1504
1012
1505
1013
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
1014
return;
1508
1015
}
1509
1016
1554
1061
const char *domain,
1555
1062
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1556
1063
flags,
1557
void *mc){
1064
void* mc){
1558
1065
if(b == NULL){
1559
1066
return;
1560
1067
}
1620
1127
errno = old_errno;
1621
1128
}
1622
1129
1623
__attribute__((nonnull, warn_unused_result))
1624
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
1131
int ret;
1626
1132
error_t ret_errno;
1632
1138
errno = ret_errno;
1633
1139
return false;
1634
1140
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1141
strcpy(ifr->ifr_name, ifname);
1637
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
1143
if(ret == -1){
1639
1144
if(debug){
1646
1151
return true;
1647
1152
}
1648
1153
1649
__attribute__((nonnull, warn_unused_result))
1650
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1651
1155
1652
1156
/* Reject the loopback device */
1694
1198
* corresponds to an acceptable network device.
1695
1199
* (This function is passed to scandir(3) as a filter function.)
1696
1200
*/
1697
__attribute__((nonnull, warn_unused_result))
1698
1201
int good_interface(const struct dirent *if_entry){
1699
1202
if(if_entry->d_name[0] == '.'){
1700
1203
return 0;
1718
1221
/*
1719
1222
* This function determines if a network interface is up.
1720
1223
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
1224
bool interface_is_up(const char *interface){
1723
1225
struct ifreq ifr;
1724
1226
if(not get_flags(interface, &ifr)){
1735
1237
/*
1736
1238
* This function determines if a network interface is running
1737
1239
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
1240
bool interface_is_running(const char *interface){
1740
1241
struct ifreq ifr;
1741
1242
if(not get_flags(interface, &ifr)){
1749
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
1251
}
1751
1252
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
1253
int notdotentries(const struct dirent *direntry){
1754
1254
/* Skip "." and ".." */
1755
1255
if(direntry->d_name[0] == '.'
1762
1262
}
1763
1263
1764
1264
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
1265
int runnable_hook(const struct dirent *direntry){
1767
1266
int ret;
1768
1267
size_t sret;
1776
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
1276
"abcdefghijklmnopqrstuvwxyz"
1778
1277
"0123456789"
1779
"_.-");
1278
"_-");
1780
1279
if((direntry->d_name)[sret] != '\0'){
1781
1280
/* Contains non-allowed characters */
1782
1281
if(debug){
1786
1285
return 0;
1787
1286
}
1788
1287
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1790
1296
if(ret == -1){
1791
1297
if(debug){
1792
1298
perror_plus("Could not stat hook");
1816
1322
return 1;
1817
1323
}
1818
1324
1819
__attribute__((nonnull, warn_unused_result))
1820
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
1326
mandos_context *mc){
1822
1327
int ret;
1826
1331
1827
1332
while(true){
1828
1333
if(mc->current_server == NULL){
1829
if(debug){
1334
if (debug){
1830
1335
fprintf_plus(stderr, "Wait until first server is found."
1831
1336
" No timeout!\n");
1832
1337
}
1833
1338
ret = avahi_simple_poll_iterate(s, -1);
1834
1339
} else {
1835
if(debug){
1340
if (debug){
1836
1341
fprintf_plus(stderr, "Check current_server if we should run"
1837
1342
" it, or wait\n");
1838
1343
}
1855
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1856
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1857
1362
1858
if(debug){
1363
if (debug){
1859
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1860
1365
block_time);
1861
1366
}
1883
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1884
1389
}
1885
1390
if(ret != 0){
1886
if(ret > 0 or errno != EINTR){
1391
if (ret > 0 or errno != EINTR){
1887
1392
return (ret != 1) ? ret : 0;
1888
1393
}
1889
1394
}
1890
1395
}
1891
1396
}
1892
1397
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
1895
1451
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);
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1454
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1914
1457
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);
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1930
1465
}
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){
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1977
1473
perror_plus("asprintf");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1982
1532
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;
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
2051
1544
} 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);
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
2071
1581
}
2072
1582
2073
__attribute__((nonnull, warn_unused_result))
2074
1583
error_t bring_up_interface(const char *const interface,
2075
1584
const float delay){
1585
int sd = -1;
2076
1586
error_t old_errno = errno;
2077
int ret;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
2078
1589
struct ifreq network;
2079
1590
unsigned int if_index = if_nametoindex(interface);
2080
1591
if(if_index == 0){
2089
1600
}
2090
1601
2091
1602
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
1603
if(not get_flags(interface, &network) and debug){
2094
1604
ret_errno = errno;
2095
1605
fprintf_plus(stderr, "Failed to get flags for interface "
2096
1606
"\"%s\"\n", interface);
2097
errno = old_errno;
2098
1607
return ret_errno;
2099
1608
}
2100
network.ifr_flags |= IFF_UP; /* set flag */
1609
network.ifr_flags |= IFF_UP;
2101
1610
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
2104
1613
ret_errno = errno;
2105
1614
perror_plus("socket");
2106
1615
errno = old_errno;
2107
1616
return ret_errno;
2108
1617
}
2109
1618
2110
1619
if(quit_now){
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
1620
close(sd);
2115
1621
errno = old_errno;
2116
1622
return EINTR;
2117
1623
}
2121
1627
interface);
2122
1628
}
2123
1629
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
1630
/* Raise priviliges */
1631
raise_privileges();
2130
1632
2131
1633
#ifdef __linux__
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
2143
1641
}
2144
1642
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
2147
1645
#ifdef __linux__
2148
1646
if(restore_loglevel){
2149
1647
ret_linux = klogctl(7, NULL, 0);
2153
1651
}
2154
1652
#endif /* __linux__ */
2155
1653
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
1654
/* Lower privileges */
1655
lower_privileges();
2165
1656
2166
1657
/* Close the socket */
2167
ret = close(sd);
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
1659
if(ret == -1){
2169
1660
perror_plus("close");
2170
1661
}
2171
1662
2172
1663
if(ret_setflags == -1){
2173
errno = ioctl_errno;
1664
errno = ret_errno;
2174
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
1666
errno = old_errno;
2176
return ioctl_errno;
1667
return ret_errno;
2177
1668
}
2178
1669
} else if(debug){
2179
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
1688
return 0;
2198
1689
}
2199
1690
2200
__attribute__((nonnull, warn_unused_result))
2201
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
2202
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
2203
1696
struct ifreq network;
2204
1697
unsigned int if_index = if_nametoindex(interface);
2205
1698
if(if_index == 0){
2208
1701
return ENXIO;
2209
1702
}
2210
1703
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
1704
if(not get_flags(interface, &network) and debug){
2213
1705
ret_errno = errno;
2214
1706
fprintf_plus(stderr, "Failed to get flags for interface "
2215
1707
"\"%s\"\n", interface);
2216
errno = old_errno;
2217
1708
return ret_errno;
2218
1709
}
2219
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2220
1711
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
2223
1714
ret_errno = errno;
2224
1715
perror_plus("socket");
2225
1716
errno = old_errno;
2231
1722
interface);
2232
1723
}
2233
1724
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
2240
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2243
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
2253
1733
2254
1734
/* Close the socket */
2255
int ret = close(sd);
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
1736
if(ret == -1){
2257
1737
perror_plus("close");
2258
1738
}
2259
1739
2260
1740
if(ret_setflags == -1){
2261
errno = ioctl_errno;
1741
errno = ret_errno;
2262
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
1743
errno = old_errno;
2264
return ioctl_errno;
1744
return ret_errno;
2265
1745
}
2266
1746
} else if(debug){
2267
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2273
1753
}
2274
1754
2275
1755
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
2281
1759
AvahiSServiceBrowser *sb = NULL;
2282
1760
error_t ret_errno;
2283
1761
int ret;
2284
1762
intmax_t tmpmax;
2285
1763
char *tmp;
2286
1764
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
2287
1767
char *interfaces_to_take_down = NULL;
2288
1768
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2292
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2293
1772
const char *seckey = PATHDIR "/" SECKEY;
2294
1773
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
2297
1776
2298
1777
bool gnutls_initialized = false;
2299
1778
bool gpgme_initialized = false;
2351
1830
.doc = "Bit length of the prime number used in the"
2352
1831
" Diffie-Hellman key exchange",
2353
1832
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
2359
1833
{ .name = "priority", .key = 130,
2360
1834
.arg = "STRING",
2361
1835
.doc = "GnuTLS priority string for the TLS handshake",
2395
1869
connect_to = arg;
2396
1870
break;
2397
1871
case 'i': /* --interface */
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2399
arg, (int)',');
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2400
1874
if(ret_errno != 0){
2401
1875
argp_error(state, "%s", strerror(ret_errno));
2402
1876
}
2416
1890
}
2417
1891
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2418
1892
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
2422
1893
case 130: /* --priority */
2423
1894
mc.priority = arg;
2424
1895
break;
2480
1951
goto end;
2481
1952
}
2482
1953
}
2483
1954
2484
1955
{
2485
1956
/* Work around Debian bug #633582:
2486
1957
<http://bugs.debian.org/633582> */
2487
1958
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
2493
} else {
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2494
1961
struct stat st;
2495
1962
2496
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
1977
}
2511
1978
}
2512
1979
}
2513
close(seckey_fd);
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
2514
1981
}
2515
1982
}
2516
1983
2517
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2518
1985
int pubkey_fd = open(pubkey, O_RDONLY);
2519
1986
if(pubkey_fd == -1){
2531
1998
}
2532
1999
}
2533
2000
}
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2560
2005
/* Lower privileges */
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2565
2010
}
2566
2011
}
2567
2012
}
2568
2013
2569
/* Remove invalid interface names (except "none") */
2014
/* Remove empty interface names */
2570
2015
{
2571
2016
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2017
while((interface = argz_next(interfaces, interfaces_size,
2573
2018
interface))){
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2577
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2578
2022
" \"%s\"\n", interface);
2579
2023
}
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2024
argz_delete(&interfaces, &interfaces_size, interface);
2581
2025
interface = NULL;
2582
2026
}
2583
2027
}
2585
2029
2586
2030
/* Run network hooks */
2587
2031
{
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2590
2035
if(interfaces_hooks == NULL){
2591
2036
perror_plus("malloc");
2592
2037
goto end;
2593
2038
}
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2599
2048
}
2600
2049
2601
2050
if(not debug){
2678
2127
}
2679
2128
2680
2129
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2683
2132
/* Look for any good interfaces */
2684
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2685
2134
alphasort);
2686
2135
if(ret >= 1){
2687
2136
/* Add all found interfaces to interfaces list */
2688
2137
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2690
2139
direntries[i]->d_name);
2691
2140
if(ret_errno != 0){
2692
errno = ret_errno;
2693
2141
perror_plus("argz_add");
2694
free(direntries[i]);
2695
2142
continue;
2696
2143
}
2697
2144
if(debug){
2698
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
2146
direntries[i]->d_name);
2700
2147
}
2701
free(direntries[i]);
2702
2148
}
2703
2149
free(direntries);
2704
2150
} else {
2705
if(ret == 0){
2706
free(direntries);
2707
}
2151
free(direntries);
2708
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2709
2153
exitcode = EXIT_FAILURE;
2710
2154
goto end;
2711
2155
}
2712
2156
}
2713
2157
2714
/* Bring up interfaces which are down, and remove any "none"s */
2715
{
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2716
2170
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2171
while((interface = argz_next(interfaces, interfaces_size,
2718
2172
interface))){
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2723
interface);
2724
interface = NULL;
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2729
interface);
2730
interface = NULL;
2731
}
2732
}
2733
break;
2734
}
2735
2173
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2174
ret = bring_up_interface(interface, delay);
2737
2175
if(not interface_was_up){
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2741
2179
} else {
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
if(errno != 0){
2746
perror_plus("argz_add");
2747
}
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2748
2183
}
2749
2184
}
2750
2185
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2751
2189
if(debug and (interfaces_to_take_down == NULL)){
2752
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2753
2191
}
2754
2192
}
2755
2193
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2758
if(debug){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2760
mc.interfaces);
2761
}
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2763
}
2764
2765
2194
if(quit_now){
2766
2195
goto end;
2767
2196
}
2768
2197
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
2770
2199
if(ret == -1){
2771
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
2772
2201
exitcode = EX_UNAVAILABLE;
2779
2208
goto end;
2780
2209
}
2781
2210
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
2211
if(mkdtemp(tempdir) == NULL){
2792
2212
perror_plus("mkdtemp");
2793
2213
goto end;
2794
2214
}
2215
tempdir_created = true;
2795
2216
2796
2217
if(quit_now){
2797
2218
goto end;
2833
2254
exitcode = EX_USAGE;
2834
2255
goto end;
2835
2256
}
2836
2257
2837
2258
if(quit_now){
2838
2259
goto end;
2839
2260
}
2869
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2870
2291
(int)retry_interval);
2871
2292
}
2872
sleep((unsigned int)retry_interval);
2293
sleep((int)retry_interval);
2873
2294
}
2874
2295
2875
if(not quit_now){
2296
if (not quit_now){
2876
2297
exitcode = EXIT_SUCCESS;
2877
2298
}
2878
2299
2933
2354
if(debug){
2934
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
2935
2356
}
2936
2357
2937
2358
ret = avahi_loop_with_timeout(simple_poll,
2938
2359
(int)(retry_interval * 1000), &mc);
2939
2360
if(debug){
2948
2369
}
2949
2370
2950
2371
/* Cleanup things */
2951
free(mc.interfaces);
2952
2953
2372
if(sb != NULL)
2954
2373
avahi_s_service_browser_free(sb);
2955
2374
2961
2380
2962
2381
if(gnutls_initialized){
2963
2382
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2964
2384
gnutls_dh_params_deinit(mc.dh_params);
2965
2385
}
2966
2386
2974
2394
mc.current_server->prev->next = NULL;
2975
2395
while(mc.current_server != NULL){
2976
2396
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2985
2397
free(mc.current_server);
2986
2398
mc.current_server = next;
2987
2399
}
2988
2400
}
2989
2401
2990
/* Re-raise privileges */
2402
/* Re-raise priviliges */
2991
2403
{
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
3019
}
3020
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
3025
}
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
2420
}
2421
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2425
}
2426
}
2427
2428
lower_privileges_permanently();
3026
2429
}
3027
2430
3028
2431
free(interfaces_to_take_down);
3029
2432
free(interfaces_hooks);
3030
2433
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
2434
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
3033
2436
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
3046
2441
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
3085
}
3086
3087
/* Removes the GPGME temp directory and all files inside */
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
direntry->d_name);
2446
if(ret < 0){
2447
perror_plus("asprintf");
2448
continue;
2449
}
2450
ret = remove(fullname);
2451
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2454
}
2455
free(fullname);
2456
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
2463
}
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2467
}
3090
2468
}
3091
2469
3092
2470
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0