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- Committer: Teddy Hogeborn
- Date: 2015-07-06 20:09:47 UTC
- mto: This revision was merged to the branch mainline in revision 759.
- Revision ID: teddy@recompile.se-20150706200947-w21u4eq74efgl6r5
Fix minor bugs and typos and add some more debug output.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
- files added:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
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() */
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() */
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 <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
170
178
171
179
/* Function to use when printing errors */
172
180
void perror_plus(const char *print_text){
181
int e = errno;
173
182
fprintf(stderr, "Mandos plugin %s: ",
174
183
program_invocation_short_name);
184
errno = e;
175
185
perror(print_text);
176
186
}
177
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
189
int fprintf_plus(FILE *stream, const char *format, ...){
179
190
va_list ap;
180
191
va_start (ap, format);
181
192
182
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
194
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
196
}
186
197
187
198
/*
189
200
* bytes. "buffer_capacity" is how much is currently allocated,
190
201
* "buffer_length" is how much is already used.
191
202
*/
203
__attribute__((nonnull, warn_unused_result))
192
204
size_t incbuffer(char **buffer, size_t buffer_length,
193
205
size_t buffer_capacity){
194
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
197
213
return 0;
198
214
}
215
*buffer = new_buf;
199
216
buffer_capacity += BUFFER_SIZE;
200
217
}
201
218
return buffer_capacity;
202
219
}
203
220
204
221
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
207
225
int ret;
208
226
server *new_server = malloc(sizeof(server));
209
227
if(new_server == NULL){
210
228
perror_plus("malloc");
211
return -1;
229
return false;
212
230
}
213
231
*new_server = (server){ .ip = strdup(ip),
214
232
.port = port,
216
234
.af = af };
217
235
if(new_server->ip == NULL){
218
236
perror_plus("strdup");
219
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
220
253
}
221
254
/* Special case of first server */
222
if (mc.current_server == NULL){
255
if(*current_server == NULL){
223
256
new_server->next = new_server;
224
257
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
258
*current_server = new_server;
227
259
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
230
263
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
239
267
}
240
268
241
269
/*
242
270
* Initialize GPGME.
243
271
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
246
277
gpgme_error_t rc;
247
278
gpgme_engine_info_t engine_info;
248
279
249
250
280
/*
251
281
* Helper function to insert pub and seckey to the engine keyring.
252
282
*/
253
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
254
284
int ret;
255
285
int fd;
256
286
gpgme_data_t pgp_data;
268
298
return false;
269
299
}
270
300
271
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
272
302
if(rc != GPG_ERR_NO_ERROR){
273
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
304
gpgme_strsource(rc), gpgme_strerror(rc));
318
348
}
319
349
320
350
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
322
352
if(rc != GPG_ERR_NO_ERROR){
323
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
367
* Decrypt OpenPGP data.
338
368
* Returns -1 on error
339
369
*/
370
__attribute__((nonnull, warn_unused_result))
340
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
372
size_t crypto_size,
342
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
343
375
gpgme_data_t dh_crypto, dh_plain;
344
376
gpgme_error_t rc;
345
377
ssize_t ret;
371
403
372
404
/* Decrypt data from the cryptotext data buffer to the plaintext
373
405
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
407
if(rc != GPG_ERR_NO_ERROR){
376
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
409
gpgme_strsource(rc), gpgme_strerror(rc));
378
410
plaintext_length = -1;
379
411
if(debug){
380
412
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
382
414
if(result == NULL){
383
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
416
} else {
461
493
return plaintext_length;
462
494
}
463
495
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
467
499
if(ret == NULL)
468
500
ret = "(unknown)";
469
501
return ret;
470
502
}
471
503
472
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
473
506
static void debuggnutls(__attribute__((unused)) int level,
474
507
const char* string){
475
508
fprintf_plus(stderr, "GnuTLS: %s", string);
476
509
}
477
510
511
__attribute__((nonnull, warn_unused_result))
478
512
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
480
515
int ret;
481
516
482
517
if(debug){
499
534
}
500
535
501
536
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
538
if(ret != GNUTLS_E_SUCCESS){
504
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
540
safer_gnutls_strerror(ret));
515
550
}
516
551
517
552
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
519
554
GNUTLS_OPENPGP_FMT_BASE64);
520
555
if(ret != GNUTLS_E_SUCCESS){
521
556
fprintf_plus(stderr,
527
562
}
528
563
529
564
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
531
566
if(ret != GNUTLS_E_SUCCESS){
532
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
568
" initialization: %s\n",
534
569
safer_gnutls_strerror(ret));
535
570
goto globalfail;
536
571
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
573
if(ret != GNUTLS_E_SUCCESS){
539
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
575
safer_gnutls_strerror(ret));
541
576
goto globalfail;
542
577
}
543
578
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
580
546
581
return 0;
547
582
548
583
globalfail:
549
584
550
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
551
586
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
553
588
return -1;
554
589
}
555
590
556
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
557
594
int ret;
558
595
/* GnuTLS session creation */
559
596
do {
571
608
{
572
609
const char *err;
573
610
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
612
if(quit_now){
576
613
gnutls_deinit(*session);
577
614
return -1;
588
625
589
626
do {
590
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
628
mc->cred);
592
629
if(quit_now){
593
630
gnutls_deinit(*session);
594
631
return -1;
604
641
/* ignore client certificate if any. */
605
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
643
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
645
609
646
return 0;
610
647
}
613
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
651
__attribute__((unused)) const char *txt){}
615
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
717
if(debug){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
720
}
721
return false;
722
}
723
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
727
return false;
728
}
729
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
if(devnull == -1){
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
733
return false;
734
}
735
pid_t pid = fork();
736
if(pid == 0){
737
/* Child */
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
740
if(errno != 0){
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
743
} else {
744
/* Set group */
745
errno = 0;
746
ret = setgid(0);
747
if(ret == -1){
748
perror_plus("setgid");
749
_exit(EX_NOPERM);
750
}
751
/* Reset supplementary groups */
752
errno = 0;
753
ret = setgroups(0, NULL);
754
if(ret == -1){
755
perror_plus("setgroups");
756
_exit(EX_NOPERM);
757
}
758
}
759
ret = dup2(devnull, STDIN_FILENO);
760
if(ret == -1){
761
perror_plus("dup2(devnull, STDIN_FILENO)");
762
_exit(EX_OSERR);
763
}
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
if(ret == -1){
766
perror_plus("close");
767
_exit(EX_OSERR);
768
}
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
if(ret == -1){
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
772
_exit(EX_OSERR);
773
}
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
775
O_RDONLY
776
| O_DIRECTORY
777
| O_PATH
778
| O_CLOEXEC));
779
if(helperdir_fd == -1){
780
perror_plus("open");
781
_exit(EX_UNAVAILABLE);
782
}
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
784
helper, O_RDONLY));
785
if(helper_fd == -1){
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
788
}
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#ifdef __GNUC__
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
793
#endif
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
797
environ) == -1){
798
#ifdef __GNUC__
799
#pragma GCC diagnostic pop
800
#endif
801
perror_plus("fexecve");
802
_exit(EXIT_FAILURE);
803
}
804
}
805
if(pid == -1){
806
perror_plus("fork");
807
return false;
808
}
809
int status;
810
pid_t pret = -1;
811
errno = 0;
812
do {
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
820
}
821
if(kill(pid, SIGTERM) == -1){
822
perror_plus("kill");
823
}
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
826
" helper program");
827
}
828
return false;
829
}
830
} while(pret == -1 and errno == EINTR);
831
if(pret == -1){
832
perror_plus("waitpid");
833
return false;
834
}
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
839
return false;
840
}
841
return true;
842
}
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
846
return false;
847
}
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
849
return false;
850
}
851
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
855
if(debug){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
857
}
858
return add_delete_local_route(true, address, if_index);
859
}
860
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
864
if(debug){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
866
}
867
return add_delete_local_route(false, address, if_index);
868
}
869
616
870
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
618
873
AvahiIfIndex if_index,
619
int af){
874
int af, mandos_context *mc){
620
875
int ret, tcp_sd = -1;
621
876
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
877
struct sockaddr_storage to;
626
878
char *buffer = NULL;
627
879
char *decrypted_buffer = NULL;
628
880
size_t buffer_length = 0;
631
883
int retval = -1;
632
884
gnutls_session_t session;
633
885
int pf; /* Protocol family */
886
bool route_added = false;
634
887
635
888
errno = 0;
636
889
652
905
return -1;
653
906
}
654
907
655
ret = init_gnutls_session(&session);
908
/* If the interface is specified and we have a list of interfaces */
909
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
910
/* Check if the interface is one of the interfaces we are using */
911
bool match = false;
912
{
913
char *interface = NULL;
914
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
915
interface))){
916
if(if_nametoindex(interface) == (unsigned int)if_index){
917
match = true;
918
break;
919
}
920
}
921
}
922
if(not match){
923
/* This interface does not match any in the list, so we don't
924
connect to the server */
925
if(debug){
926
char interface[IF_NAMESIZE];
927
if(if_indextoname((unsigned int)if_index, interface) == NULL){
928
perror_plus("if_indextoname");
929
} else {
930
fprintf_plus(stderr, "Skipping server on non-used interface"
931
" \"%s\"\n",
932
if_indextoname((unsigned int)if_index,
933
interface));
934
}
935
}
936
return -1;
937
}
938
}
939
940
ret = init_gnutls_session(&session, mc);
656
941
if(ret != 0){
657
942
return -1;
658
943
}
659
944
660
945
if(debug){
661
946
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
947
PRIuMAX "\n", ip, (uintmax_t)port);
663
948
}
664
949
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
950
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
666
951
if(tcp_sd < 0){
667
952
int e = errno;
668
953
perror_plus("socket");
677
962
678
963
memset(&to, 0, sizeof(to));
679
964
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
965
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
966
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
682
967
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
968
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
969
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
685
970
}
686
971
if(ret < 0 ){
687
972
int e = errno;
696
981
goto mandos_end;
697
982
}
698
983
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
984
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
985
if(IN6_IS_ADDR_LINKLOCAL
986
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
987
if(if_index == AVAHI_IF_UNSPEC){
707
988
fprintf_plus(stderr, "An IPv6 link-local address is"
708
989
" incomplete without a network interface\n");
710
991
goto mandos_end;
711
992
}
712
993
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
994
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
995
}
715
996
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
997
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
998
}
720
999
721
1000
if(quit_now){
729
1008
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
1009
perror_plus("if_indextoname");
731
1010
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
734
1013
}
735
1014
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
738
1017
}
739
1018
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
1019
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
1020
if(af == AF_INET6){
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1024
NI_NUMERICHOST);
1025
} else {
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1029
NI_NUMERICHOST);
1030
}
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1037
}
1038
}
1039
1040
if(quit_now){
1041
errno = EINTR;
1042
goto mandos_end;
1043
}
1044
1045
while(true){
1046
if(af == AF_INET6){
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1049
} else {
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1052
}
1053
if(ret < 0){
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1060
&to)->sin6_addr)))
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1071
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1075
*/
1076
if(debug){
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1078
" direct route\n");
1079
}
1080
int e = errno;
1081
route_added = add_local_route(ip, if_index);
1082
if(route_added){
1083
continue;
1084
}
1085
errno = e;
1086
}
1087
if(errno != ECONNREFUSED or debug){
1088
int e = errno;
1089
perror_plus("connect");
1090
errno = e;
1091
}
1092
goto mandos_end;
1093
}
1094
1095
if(quit_now){
1096
errno = EINTR;
1097
goto mandos_end;
1098
}
1099
break;
780
1100
}
781
1101
782
1102
const char *out = mandos_protocol_version;
818
1138
goto mandos_end;
819
1139
}
820
1140
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1141
/* This casting via intptr_t is to eliminate warning about casting
1142
an int to a pointer type. This is exactly how the GnuTLS Guile
1143
function "set-session-transport-fd!" does it. */
1144
gnutls_transport_set_ptr(session,
1145
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
1146
824
1147
if(quit_now){
825
1148
errno = EINTR;
930
1253
if(buffer_length > 0){
931
1254
ssize_t decrypted_buffer_size;
932
1255
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
1256
&decrypted_buffer, mc);
934
1257
if(decrypted_buffer_size >= 0){
935
1258
936
1259
written = 0;
962
1285
963
1286
mandos_end:
964
1287
{
1288
if(route_added){
1289
if(not delete_local_route(ip, if_index)){
1290
fprintf_plus(stderr, "Failed to delete local route to %s on"
1291
" interface %d", ip, if_index);
1292
}
1293
}
965
1294
int e = errno;
966
1295
free(decrypted_buffer);
967
1296
free(buffer);
984
1313
return retval;
985
1314
}
986
1315
1316
__attribute__((nonnull))
987
1317
static void resolve_callback(AvahiSServiceResolver *r,
988
1318
AvahiIfIndex interface,
989
1319
AvahiProtocol proto,
997
1327
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1328
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1329
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1330
void *mc){
1331
if(r == NULL){
1332
return;
1333
}
1002
1334
1003
1335
/* Called whenever a service has been resolved successfully or
1004
1336
timed out */
1005
1337
1006
1338
if(quit_now){
1339
avahi_s_service_resolver_free(r);
1007
1340
return;
1008
1341
}
1009
1342
1013
1346
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1347
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1348
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1349
avahi_strerror(avahi_server_errno
1350
(((mandos_context*)mc)->server)));
1017
1351
break;
1018
1352
1019
1353
case AVAHI_RESOLVER_FOUND:
1025
1359
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1360
host_name, ip, (intmax_t)interface, port);
1027
1361
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1362
int ret = start_mandos_communication(ip, (in_port_t)port,
1363
interface,
1364
avahi_proto_to_af(proto),
1365
mc);
1030
1366
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1032
1368
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1369
if(not add_server(ip, (in_port_t)port, interface,
1370
avahi_proto_to_af(proto),
1371
&((mandos_context*)mc)->current_server)){
1372
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1373
" list\n", name);
1374
}
1035
1375
}
1036
1376
}
1037
1377
}
1047
1387
const char *domain,
1048
1388
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1389
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1390
void *mc){
1391
if(b == NULL){
1392
return;
1393
}
1052
1394
1053
1395
/* Called whenever a new services becomes available on the LAN or
1054
1396
is removed from the LAN */
1062
1404
case AVAHI_BROWSER_FAILURE:
1063
1405
1064
1406
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1407
avahi_strerror(avahi_server_errno
1408
(((mandos_context*)mc)->server)));
1409
avahi_simple_poll_quit(simple_poll);
1067
1410
return;
1068
1411
1069
1412
case AVAHI_BROWSER_NEW:
1072
1415
the callback function is called the Avahi server will free the
1073
1416
resolver for us. */
1074
1417
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1418
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1419
interface, protocol, name, type,
1420
domain, protocol, 0,
1421
resolve_callback, mc) == NULL)
1078
1422
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1423
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1424
avahi_strerror(avahi_server_errno
1425
(((mandos_context*)mc)->server)));
1081
1426
break;
1082
1427
1083
1428
case AVAHI_BROWSER_REMOVE:
1102
1447
signal_received = sig;
1103
1448
int old_errno = errno;
1104
1449
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1450
if(simple_poll != NULL){
1451
avahi_simple_poll_quit(simple_poll);
1107
1452
}
1108
1453
errno = old_errno;
1109
1454
}
1110
1455
1456
__attribute__((nonnull, warn_unused_result))
1111
1457
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1458
int ret;
1459
error_t ret_errno;
1113
1460
1114
1461
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1462
if(s < 0){
1463
ret_errno = errno;
1116
1464
perror_plus("socket");
1465
errno = ret_errno;
1117
1466
return false;
1118
1467
}
1119
1468
strcpy(ifr->ifr_name, ifname);
1120
1469
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1470
if(ret == -1){
1122
1471
if(debug){
1472
ret_errno = errno;
1123
1473
perror_plus("ioctl SIOCGIFFLAGS");
1474
errno = ret_errno;
1124
1475
}
1125
1476
return false;
1126
1477
}
1127
1478
return true;
1128
1479
}
1129
1480
1481
__attribute__((nonnull, warn_unused_result))
1130
1482
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1483
1132
1484
/* Reject the loopback device */
1174
1526
* corresponds to an acceptable network device.
1175
1527
* (This function is passed to scandir(3) as a filter function.)
1176
1528
*/
1529
__attribute__((nonnull, warn_unused_result))
1177
1530
int good_interface(const struct dirent *if_entry){
1178
1531
if(if_entry->d_name[0] == '.'){
1179
1532
return 0;
1195
1548
}
1196
1549
1197
1550
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1551
* This function determines if a network interface is up.
1552
*/
1553
__attribute__((nonnull, warn_unused_result))
1554
bool interface_is_up(const char *interface){
1555
struct ifreq ifr;
1556
if(not get_flags(interface, &ifr)){
1557
if(debug){
1558
fprintf_plus(stderr, "Failed to get flags for interface "
1559
"\"%s\"\n", interface);
1560
}
1561
return false;
1562
}
1563
1564
return (bool)(ifr.ifr_flags & IFF_UP);
1565
}
1566
1567
/*
1568
* This function determines if a network interface is running
1569
*/
1570
__attribute__((nonnull, warn_unused_result))
1571
bool interface_is_running(const char *interface){
1572
struct ifreq ifr;
1573
if(not get_flags(interface, &ifr)){
1574
if(debug){
1575
fprintf_plus(stderr, "Failed to get flags for interface "
1576
"\"%s\"\n", interface);
1577
}
1578
return false;
1579
}
1580
1581
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1582
}
1583
1584
__attribute__((nonnull, pure, warn_unused_result))
1240
1585
int notdotentries(const struct dirent *direntry){
1241
1586
/* Skip "." and ".." */
1242
1587
if(direntry->d_name[0] == '.'
1249
1594
}
1250
1595
1251
1596
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1252
1598
int runnable_hook(const struct dirent *direntry){
1253
1599
int ret;
1254
1600
size_t sret;
1262
1608
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
1609
"abcdefghijklmnopqrstuvwxyz"
1264
1610
"0123456789"
1265
"_-");
1611
"_.-");
1266
1612
if((direntry->d_name)[sret] != '\0'){
1267
1613
/* Contains non-allowed characters */
1268
1614
if(debug){
1272
1618
return 0;
1273
1619
}
1274
1620
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1621
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1283
1622
if(ret == -1){
1284
1623
if(debug){
1285
1624
perror_plus("Could not stat hook");
1309
1648
return 1;
1310
1649
}
1311
1650
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1651
__attribute__((nonnull, warn_unused_result))
1652
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
mandos_context *mc){
1313
1654
int ret;
1314
1655
struct timespec now;
1315
1656
struct timespec waited_time;
1316
1657
intmax_t block_time;
1317
1658
1318
1659
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1660
if(mc->current_server == NULL){
1661
if(debug){
1321
1662
fprintf_plus(stderr, "Wait until first server is found."
1322
1663
" No timeout!\n");
1323
1664
}
1324
1665
ret = avahi_simple_poll_iterate(s, -1);
1325
1666
} else {
1326
if (debug){
1667
if(debug){
1327
1668
fprintf_plus(stderr, "Check current_server if we should run"
1328
1669
" it, or wait\n");
1329
1670
}
1336
1677
/* Calculating in ms how long time between now and server
1337
1678
who we visted longest time ago. Now - last seen. */
1338
1679
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1680
- mc->current_server->last_seen.tv_sec);
1340
1681
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1682
- mc->current_server->last_seen.tv_nsec);
1342
1683
/* total time is 10s/10,000ms.
1343
1684
Converting to s from ms by dividing by 1,000,
1344
1685
and ns to ms by dividing by 1,000,000. */
1346
1687
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1688
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1689
1349
if (debug){
1690
if(debug){
1350
1691
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
1692
block_time);
1352
1693
}
1353
1694
1354
1695
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1696
ret = start_mandos_communication(mc->current_server->ip,
1697
mc->current_server->port,
1698
mc->current_server->if_index,
1699
mc->current_server->af, mc);
1359
1700
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1701
avahi_simple_poll_quit(s);
1361
1702
return 0;
1362
1703
}
1363
1704
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1705
&mc->current_server->last_seen);
1365
1706
if(ret == -1){
1366
1707
perror_plus("clock_gettime");
1367
1708
return -1;
1368
1709
}
1369
mc.current_server = mc.current_server->next;
1710
mc->current_server = mc->current_server->next;
1370
1711
block_time = 0; /* Call avahi to find new Mandos
1371
1712
servers, but don't block */
1372
1713
}
1374
1715
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1716
}
1376
1717
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1718
if(ret > 0 or errno != EINTR){
1378
1719
return (ret != 1) ? ret : 0;
1379
1720
}
1380
1721
}
1381
1722
}
1382
1723
}
1383
1724
1384
bool run_network_hooks(const char *mode, const char *interface,
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1385
1727
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1731
| O_CLOEXEC);
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1734
if(debug){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1737
}
1738
} else {
1739
perror_plus("open");
1740
}
1741
return;
1742
}
1743
}
1744
#ifdef __GLIBC__
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1750
alphasort);
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1754
alphasort);
1755
#endif /* not __GLIBC__ */
1391
1756
if(numhooks == -1){
1392
1757
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1758
return;
1759
}
1760
struct dirent *direntry;
1761
int ret;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1763
if(devnull == -1){
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1765
return;
1766
}
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1769
if(debug){
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1771
direntry->d_name);
1772
}
1773
pid_t hook_pid = fork();
1774
if(hook_pid == 0){
1775
/* Child */
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1778
if(errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
_exit(EX_NOPERM);
1781
}
1782
/* Set group */
1783
errno = 0;
1784
ret = setgid(0);
1785
if(ret == -1){
1786
perror_plus("setgid");
1787
_exit(EX_NOPERM);
1788
}
1789
/* Reset supplementary groups */
1790
errno = 0;
1791
ret = setgroups(0, NULL);
1792
if(ret == -1){
1793
perror_plus("setgroups");
1794
_exit(EX_NOPERM);
1795
}
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1797
if(ret == -1){
1798
perror_plus("setenv");
1799
_exit(EX_OSERR);
1800
}
1801
ret = setenv("DEVICE", interface, 1);
1802
if(ret == -1){
1803
perror_plus("setenv");
1804
_exit(EX_OSERR);
1805
}
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1807
if(ret == -1){
1808
perror_plus("setenv");
1809
_exit(EX_OSERR);
1810
}
1811
ret = setenv("MODE", mode, 1);
1812
if(ret == -1){
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
char *delaystring;
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1818
if(ret == -1){
1400
1819
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1820
_exit(EX_OSERR);
1821
}
1822
ret = setenv("DELAY", delaystring, 1);
1823
if(ret == -1){
1471
1824
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1825
perror_plus("setenv");
1826
_exit(EX_OSERR);
1827
}
1828
free(delaystring);
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1831
if(ret == -1){
1832
perror_plus("setenv");
1833
_exit(EX_OSERR);
1834
}
1835
}
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1837
direntry->d_name,
1838
O_RDONLY));
1839
if(hook_fd == -1){
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1842
}
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1846
}
1847
ret = dup2(devnull, STDIN_FILENO);
1848
if(ret == -1){
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1850
_exit(EX_OSERR);
1851
}
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1853
if(ret == -1){
1854
perror_plus("close");
1855
_exit(EX_OSERR);
1856
}
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1858
if(ret == -1){
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1860
_exit(EX_OSERR);
1861
}
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1863
environ) == -1){
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1866
}
1867
} else {
1868
if(hook_pid == -1){
1869
perror_plus("fork");
1870
free(direntry);
1871
continue;
1872
}
1873
int status;
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1876
free(direntry);
1877
continue;
1878
}
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1884
free(direntry);
1885
continue;
1886
}
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1890
WTERMSIG(status));
1891
free(direntry);
1892
continue;
1893
} else {
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1896
free(direntry);
1897
continue;
1898
}
1899
}
1900
if(debug){
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1902
direntry->d_name);
1903
}
1904
free(direntry);
1905
}
1906
free(direntries);
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1909
} else {
1910
hookdir_fd = -1;
1911
}
1912
close(devnull);
1913
}
1914
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1917
const float delay){
1918
error_t old_errno = errno;
1919
int ret;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1922
if(if_index == 0){
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1924
errno = old_errno;
1925
return ENXIO;
1926
}
1927
1928
if(quit_now){
1929
errno = old_errno;
1930
return EINTR;
1931
}
1932
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1936
ret_errno = errno;
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1939
errno = old_errno;
1940
return ret_errno;
1941
}
1942
network.ifr_flags |= IFF_UP; /* set flag */
1943
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1945
if(sd == -1){
1946
ret_errno = errno;
1947
perror_plus("socket");
1948
errno = old_errno;
1949
return ret_errno;
1950
}
1951
1952
if(quit_now){
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1954
if(ret == -1){
1955
perror_plus("close");
1956
}
1957
errno = old_errno;
1958
return EINTR;
1959
}
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1963
interface);
1964
}
1965
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1968
if(ret_errno != 0){
1969
errno = ret_errno;
1970
perror_plus("Failed to raise privileges");
1971
}
1972
1973
#ifdef __linux__
1974
int ret_linux;
1975
bool restore_loglevel = false;
1976
if(ret_errno == 0){
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
} else {
1983
restore_loglevel = true;
1984
}
1985
}
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1989
#ifdef __linux__
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
1998
/* If raise_privileges() succeeded above */
1999
if(ret_errno == 0){
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2002
if(ret_errno != 0){
2003
errno = ret_errno;
2004
perror_plus("Failed to lower privileges");
2005
}
2006
}
2007
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2010
if(ret == -1){
2011
perror_plus("close");
2012
}
2013
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2017
errno = old_errno;
2018
return ioctl_errno;
2019
}
2020
} else if(debug){
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2022
interface);
2023
}
2024
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2029
break;
2030
}
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2035
}
2036
}
2037
2038
errno = old_errno;
2039
return 0;
2040
}
2041
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2047
if(if_index == 0){
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2049
errno = old_errno;
2050
return ENXIO;
2051
}
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2055
ret_errno = errno;
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2058
errno = old_errno;
2059
return ret_errno;
2060
}
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2062
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2064
if(sd == -1){
2065
ret_errno = errno;
2066
perror_plus("socket");
2067
errno = old_errno;
2068
return ret_errno;
2069
}
2070
2071
if(debug){
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2073
interface);
2074
}
2075
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to raise privileges");
2081
}
2082
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2085
2086
/* If raise_privileges() succeeded above */
2087
if(ret_errno == 0){
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2090
if(ret_errno != 0){
2091
errno = ret_errno;
2092
perror_plus("Failed to lower privileges");
2093
}
2094
}
2095
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2098
if(ret == -1){
2099
perror_plus("close");
2100
}
2101
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2105
errno = old_errno;
2106
return ioctl_errno;
2107
}
2108
} else if(debug){
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2110
interface);
2111
}
2112
2113
errno = old_errno;
2114
return 0;
1511
2115
}
1512
2116
1513
2117
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
1514
2122
AvahiSServiceBrowser *sb = NULL;
1515
int error;
2123
error_t ret_errno;
1516
2124
int ret;
1517
2125
intmax_t tmpmax;
1518
2126
char *tmp;
1519
2127
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
1528
2133
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
2134
const char *seckey = PATHDIR "/" SECKEY;
1530
2135
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
1531
2137
1532
2138
bool gnutls_initialized = false;
1533
2139
bool gpgme_initialized = false;
1595
2201
.group = 2 },
1596
2202
{ .name = "retry", .key = 132,
1597
2203
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
2204
.doc = "Retry interval used when denied by the Mandos server",
1599
2205
.group = 2 },
1600
2206
{ .name = "network-hook-dir", .key = 133,
1601
2207
.arg = "DIR",
1624
2230
connect_to = arg;
1625
2231
break;
1626
2232
case 'i': /* --interface */
1627
interface = arg;
2233
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2234
arg, (int)',');
2235
if(ret_errno != 0){
2236
argp_error(state, "%s", strerror(ret_errno));
2237
}
1628
2238
break;
1629
2239
case 's': /* --seckey */
1630
2240
seckey = arg;
1673
2283
argp_state_help(state, state->out_stream,
1674
2284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
2285
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
2286
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
2287
exit(argp_err_exit_status);
1680
2288
break;
1704
2312
goto end;
1705
2313
}
1706
2314
}
1707
2315
1708
2316
{
1709
2317
/* Work around Debian bug #633582:
1710
2318
<http://bugs.debian.org/633582> */
1711
2319
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2322
if(ret_errno != 0){
2323
errno = ret_errno;
2324
perror_plus("Failed to raise privileges");
1717
2325
} else {
1718
2326
struct stat st;
1719
2327
1737
2345
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
2346
}
1739
2347
}
1740
2348
1741
2349
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
2350
int pubkey_fd = open(pubkey, O_RDONLY);
1743
2351
if(pubkey_fd == -1){
1758
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
2367
}
1760
2368
}
1761
2369
1762
2370
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2371
ret_errno = lower_privileges();
2372
if(ret_errno != 0){
2373
errno = ret_errno;
2374
perror_plus("Failed to lower privileges");
2375
}
2376
}
2377
}
2378
2379
/* Remove invalid interface names (except "none") */
2380
{
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2383
interface))){
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2389
}
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2391
interface = NULL;
1767
2392
}
1768
2393
}
1769
2394
}
1770
2395
1771
2396
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2397
{
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
2402
goto end;
2403
}
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2406
}
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1774
2409
}
1775
2410
1776
2411
if(not debug){
1777
2412
avahi_set_log_function(empty_log);
1778
2413
}
1779
2414
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
2415
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2416
from the signal handler */
1814
2417
/* Initialize the pseudo-RNG for Avahi */
1815
2418
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
1818
2421
fprintf_plus(stderr,
1819
2422
"Avahi: Failed to create simple poll object.\n");
1820
2423
exitcode = EX_UNAVAILABLE;
1884
2487
}
1885
2488
}
1886
2489
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2495
alphasort);
2496
if(ret >= 1){
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2505
continue;
2506
}
2507
if(debug){
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2510
}
2511
free(direntries[i]);
2512
}
2513
free(direntries);
2514
} else {
2515
if(ret == 0){
2516
free(direntries);
2517
}
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2520
goto end;
2521
}
2522
}
2523
2524
/* Bring up interfaces which are down, and remove any "none"s */
2525
{
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2528
interface))){
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2533
interface);
2534
interface = NULL;
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
2539
interface);
2540
interface = NULL;
1972
2541
}
1973
2542
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
1991
2543
break;
1992
2544
}
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2548
if(errno != 0){
2549
perror_plus("Failed to bring up interface");
2550
} else {
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2553
interface);
2554
if(errno != 0){
2555
perror_plus("argz_add");
2556
}
2557
}
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2562
}
2563
}
2564
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2567
if(debug){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2569
mc.interfaces);
2570
}
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2022
2572
}
2023
2573
2024
2574
if(quit_now){
2025
2575
goto end;
2026
2576
}
2027
2577
2028
ret = init_gnutls_global(pubkey, seckey);
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
2029
2579
if(ret == -1){
2030
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
2581
exitcode = EX_UNAVAILABLE;
2038
2588
goto end;
2039
2589
}
2040
2590
2041
if(mkdtemp(tempdir) == NULL){
2591
/* Try /run/tmp before /tmp */
2592
tempdir = mkdtemp(run_tempdir);
2593
if(tempdir == NULL and errno == ENOENT){
2594
if(debug){
2595
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2596
run_tempdir, old_tempdir);
2597
}
2598
tempdir = mkdtemp(old_tempdir);
2599
}
2600
if(tempdir == NULL){
2042
2601
perror_plus("mkdtemp");
2043
2602
goto end;
2044
2603
}
2045
tempdir_created = true;
2046
2604
2047
2605
if(quit_now){
2048
2606
goto end;
2049
2607
}
2050
2608
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2609
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2052
2610
fprintf_plus(stderr, "init_gpgme failed\n");
2053
2611
exitcode = EX_UNAVAILABLE;
2054
2612
goto end;
2064
2622
/* Connect directly, do not use Zeroconf */
2065
2623
/* (Mainly meant for debugging) */
2066
2624
char *address = strrchr(connect_to, ':');
2625
2067
2626
if(address == NULL){
2068
2627
fprintf_plus(stderr, "No colon in address\n");
2069
2628
exitcode = EX_USAGE;
2074
2633
goto end;
2075
2634
}
2076
2635
2077
uint16_t port;
2636
in_port_t port;
2078
2637
errno = 0;
2079
2638
tmpmax = strtoimax(address+1, &tmp, 10);
2080
2639
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2640
or tmpmax != (in_port_t)tmpmax){
2082
2641
fprintf_plus(stderr, "Bad port number\n");
2083
2642
exitcode = EX_USAGE;
2084
2643
goto end;
2085
2644
}
2086
2645
2087
2646
if(quit_now){
2088
2647
goto end;
2089
2648
}
2090
2649
2091
port = (uint16_t)tmpmax;
2650
port = (in_port_t)tmpmax;
2092
2651
*address = '\0';
2093
2652
/* Colon in address indicates IPv6 */
2094
2653
int af;
2110
2669
}
2111
2670
2112
2671
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2672
ret = start_mandos_communication(address, port, if_index, af,
2673
&mc);
2114
2674
if(quit_now or ret == 0){
2115
2675
break;
2116
2676
}
2118
2678
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
2679
(int)retry_interval);
2120
2680
}
2121
sleep((int)retry_interval);
2681
sleep((unsigned int)retry_interval);
2122
2682
}
2123
2683
2124
if (not quit_now){
2684
if(not quit_now){
2125
2685
exitcode = EXIT_SUCCESS;
2126
2686
}
2127
2687
2142
2702
config.publish_domain = 0;
2143
2703
2144
2704
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2705
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2706
&config, NULL, NULL, &ret_errno);
2148
2707
2149
2708
/* Free the Avahi configuration data */
2150
2709
avahi_server_config_free(&config);
2153
2712
/* Check if creating the Avahi server object succeeded */
2154
2713
if(mc.server == NULL){
2155
2714
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2715
avahi_strerror(ret_errno));
2157
2716
exitcode = EX_UNAVAILABLE;
2158
2717
goto end;
2159
2718
}
2165
2724
/* Create the Avahi service browser */
2166
2725
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
2726
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
2727
NULL, 0, browse_callback,
2728
(void *)&mc);
2169
2729
if(sb == NULL){
2170
2730
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
2731
avahi_strerror(avahi_server_errno(mc.server)));
2182
2742
if(debug){
2183
2743
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
2744
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2745
2746
ret = avahi_loop_with_timeout(simple_poll,
2747
(int)(retry_interval * 1000), &mc);
2188
2748
if(debug){
2189
2749
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
2750
(ret == 0) ? "successfully" : "with error");
2197
2757
}
2198
2758
2199
2759
/* Cleanup things */
2760
free(mc.interfaces);
2761
2200
2762
if(sb != NULL)
2201
2763
avahi_s_service_browser_free(sb);
2202
2764
2203
2765
if(mc.server != NULL)
2204
2766
avahi_server_free(mc.server);
2205
2767
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2768
if(simple_poll != NULL)
2769
avahi_simple_poll_free(simple_poll);
2208
2770
2209
2771
if(gnutls_initialized){
2210
2772
gnutls_certificate_free_credentials(mc.cred);
2222
2784
mc.current_server->prev->next = NULL;
2223
2785
while(mc.current_server != NULL){
2224
2786
server *next = mc.current_server->next;
2787
#ifdef __GNUC__
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2790
#endif
2791
free((char *)(mc.current_server->ip));
2792
#ifdef __GNUC__
2793
#pragma GCC diagnostic pop
2794
#endif
2225
2795
free(mc.current_server);
2226
2796
mc.current_server = next;
2227
2797
}
2228
2798
}
2229
2799
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2800
/* Re-raise privileges */
2234
2801
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2802
ret_errno = raise_privileges();
2803
if(ret_errno != 0){
2804
errno = ret_errno;
2805
perror_plus("Failed to raise privileges");
2806
} else {
2807
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2811
2812
/* Take down the network interfaces which were brought up */
2813
{
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2817
interface))){
2818
ret_errno = take_down_interface(interface);
2819
if(ret_errno != 0){
2820
errno = ret_errno;
2821
perror_plus("Failed to take down interface");
2822
}
2823
}
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2826
" down\n");
2827
}
2828
}
2239
2829
}
2240
2830
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2831
ret_errno = lower_privileges_permanently();
2832
if(ret_errno != 0){
2833
errno = ret_errno;
2834
perror_plus("Failed to lower privileges permanently");
2257
2835
}
2258
2836
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2837
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
2265
2840
2266
2841
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
2842
if(tempdir != NULL){
2268
2843
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
direntry->d_name);
2278
if(ret < 0){
2279
perror_plus("asprintf");
2280
continue;
2281
}
2282
ret = remove(fullname);
2283
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
2286
}
2287
free(fullname);
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2845
| O_NOFOLLOW
2846
| O_DIRECTORY
2847
| O_PATH));
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2850
} else {
2851
#ifdef __GLIBC__
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2857
alphasort);
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2861
alphasort);
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2866
if(ret == -1){
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2870
}
2871
free(direntries[i]);
2872
}
2873
2874
/* need to clean even if 0 because man page doesn't specify */
2875
free(direntries);
2876
if(numentries == -1){
2877
perror_plus("scandir");
2878
}
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2882
}
2288
2883
}
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
2295
}
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));
2299
2885
}
2300
2886
}
2301
2887
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0