To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 532
- compare with another revision
- download diff
- download tarball
- view history from revision 532
- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
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() */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#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() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
__attribute__((format (gnu_printf, 2, 3)))
189
179
int fprintf_plus(FILE *stream, const char *format, ...){
190
180
va_list ap;
191
181
va_start (ap, format);
192
182
193
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
184
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
186
}
197
187
198
188
/*
200
190
* bytes. "buffer_capacity" is how much is currently allocated,
201
191
* "buffer_length" is how much is already used.
202
192
*/
203
__attribute__((nonnull, warn_unused_result))
204
193
size_t incbuffer(char **buffer, size_t buffer_length,
205
194
size_t buffer_capacity){
206
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
213
198
return 0;
214
199
}
215
*buffer = new_buf;
216
200
buffer_capacity += BUFFER_SIZE;
217
201
}
218
202
return buffer_capacity;
219
203
}
220
204
221
205
/* Add server to set of servers to retry periodically */
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){
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
225
208
int ret;
226
209
server *new_server = malloc(sizeof(server));
227
210
if(new_server == NULL){
234
217
.af = af };
235
218
if(new_server->ip == NULL){
236
219
perror_plus("strdup");
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
220
return false;
253
221
}
254
222
/* Special case of first server */
255
if(*current_server == NULL){
223
if (mc.current_server == NULL){
256
224
new_server->next = new_server;
257
225
new_server->prev = new_server;
258
*current_server = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
259
228
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
263
231
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
265
238
}
266
239
return true;
267
240
}
269
242
/*
270
243
* Initialize GPGME.
271
244
*/
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){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
277
247
gpgme_error_t rc;
278
248
gpgme_engine_info_t engine_info;
279
249
250
280
251
/*
281
252
* Helper function to insert pub and seckey to the engine keyring.
282
253
*/
283
bool import_key(const char * const filename){
254
bool import_key(const char *filename){
284
255
int ret;
285
256
int fd;
286
257
gpgme_data_t pgp_data;
298
269
return false;
299
270
}
300
271
301
rc = gpgme_op_import(mc->ctx, pgp_data);
272
rc = gpgme_op_import(mc.ctx, pgp_data);
302
273
if(rc != GPG_ERR_NO_ERROR){
303
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
275
gpgme_strsource(rc), gpgme_strerror(rc));
348
319
}
349
320
350
321
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
322
rc = gpgme_new(&(mc.ctx));
352
323
if(rc != GPG_ERR_NO_ERROR){
353
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
338
* Decrypt OpenPGP data.
368
339
* Returns -1 on error
369
340
*/
370
__attribute__((nonnull, warn_unused_result))
371
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
342
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
343
char **plaintext){
375
344
gpgme_data_t dh_crypto, dh_plain;
376
345
gpgme_error_t rc;
377
346
ssize_t ret;
403
372
404
373
/* Decrypt data from the cryptotext data buffer to the plaintext
405
374
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
376
if(rc != GPG_ERR_NO_ERROR){
408
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
378
gpgme_strsource(rc), gpgme_strerror(rc));
410
379
plaintext_length = -1;
411
380
if(debug){
412
381
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
382
result = gpgme_op_decrypt_result(mc.ctx);
414
383
if(result == NULL){
415
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
385
} else {
493
462
return plaintext_length;
494
463
}
495
464
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
499
468
if(ret == NULL)
500
469
ret = "(unknown)";
501
470
return ret;
502
471
}
503
472
504
473
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
474
static void debuggnutls(__attribute__((unused)) int level,
507
475
const char* string){
508
476
fprintf_plus(stderr, "GnuTLS: %s", string);
509
477
}
510
478
511
__attribute__((nonnull, warn_unused_result))
512
479
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
480
const char *seckeyfilename){
515
481
int ret;
516
482
517
483
if(debug){
534
500
}
535
501
536
502
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
504
if(ret != GNUTLS_E_SUCCESS){
539
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
506
safer_gnutls_strerror(ret));
550
516
}
551
517
552
518
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
554
520
GNUTLS_OPENPGP_FMT_BASE64);
555
521
if(ret != GNUTLS_E_SUCCESS){
556
522
fprintf_plus(stderr,
562
528
}
563
529
564
530
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
531
ret = gnutls_dh_params_init(&mc.dh_params);
566
532
if(ret != GNUTLS_E_SUCCESS){
567
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
534
" initialization: %s\n",
569
535
safer_gnutls_strerror(ret));
570
536
goto globalfail;
571
537
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
539
if(ret != GNUTLS_E_SUCCESS){
574
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
541
safer_gnutls_strerror(ret));
576
542
goto globalfail;
577
543
}
578
544
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
546
581
547
return 0;
582
548
583
549
globalfail:
584
550
585
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
586
552
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_dh_params_deinit(mc.dh_params);
588
554
return -1;
589
555
}
590
556
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
557
static int init_gnutls_session(gnutls_session_t *session){
594
558
int ret;
595
559
/* GnuTLS session creation */
596
560
do {
608
572
{
609
573
const char *err;
610
574
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
576
if(quit_now){
613
577
gnutls_deinit(*session);
614
578
return -1;
625
589
626
590
do {
627
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
592
mc.cred);
629
593
if(quit_now){
630
594
gnutls_deinit(*session);
631
595
return -1;
641
605
/* ignore client certificate if any. */
642
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
607
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
609
646
610
return 0;
647
611
}
651
615
__attribute__((unused)) const char *txt){}
652
616
653
617
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
618
static int start_mandos_communication(const char *ip, uint16_t port,
656
619
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
620
int af){
658
621
int ret, tcp_sd = -1;
659
622
ssize_t sret;
660
struct sockaddr_storage to;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
661
627
char *buffer = NULL;
662
628
char *decrypted_buffer = NULL;
663
629
size_t buffer_length = 0;
687
653
return -1;
688
654
}
689
655
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
656
ret = init_gnutls_session(&session);
723
657
if(ret != 0){
724
658
return -1;
725
659
}
726
660
727
661
if(debug){
728
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
663
PRIu16 "\n", ip, port);
730
664
}
731
665
732
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
678
745
679
memset(&to, 0, sizeof(to));
746
680
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
683
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
752
686
}
753
687
if(ret < 0 ){
754
688
int e = errno;
763
697
goto mandos_end;
764
698
}
765
699
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
769
707
if(if_index == AVAHI_IF_UNSPEC){
770
708
fprintf_plus(stderr, "An IPv6 link-local address is"
771
709
" incomplete without a network interface\n");
773
711
goto mandos_end;
774
712
}
775
713
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
to.in6.sin6_scope_id = (uint32_t)if_index;
777
715
}
778
716
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
780
720
}
781
721
782
722
if(quit_now){
790
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
731
perror_plus("if_indextoname");
792
732
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
795
735
}
796
736
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
799
739
}
800
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
802
743
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
807
746
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
812
749
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
752
} else {
753
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
819
756
}
820
757
}
821
758
825
762
}
826
763
827
764
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
766
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
768
}
834
769
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
771
int e = errno;
837
772
perror_plus("connect");
838
773
errno = e;
884
819
goto mandos_end;
885
820
}
886
821
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
892
824
893
825
if(quit_now){
894
826
errno = EINTR;
999
931
if(buffer_length > 0){
1000
932
ssize_t decrypted_buffer_size;
1001
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
934
&decrypted_buffer);
1003
935
if(decrypted_buffer_size >= 0){
1004
936
1005
937
written = 0;
1053
985
return retval;
1054
986
}
1055
987
1056
__attribute__((nonnull))
1057
988
static void resolve_callback(AvahiSServiceResolver *r,
1058
989
AvahiIfIndex interface,
1059
990
AvahiProtocol proto,
1067
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
1000
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1074
1003
1075
1004
/* Called whenever a service has been resolved successfully or
1076
1005
timed out */
1077
1006
1078
1007
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
1008
return;
1081
1009
}
1082
1010
1086
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
1016
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1017
avahi_strerror(avahi_server_errno(mc.server)));
1091
1018
break;
1092
1019
1093
1020
case AVAHI_RESOLVER_FOUND:
1099
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
1027
host_name, ip, (intmax_t)interface, port);
1101
1028
}
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1106
1031
if(ret == 0){
1107
avahi_simple_poll_quit(simple_poll);
1032
avahi_simple_poll_quit(mc.simple_poll);
1108
1033
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1112
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
1037
" list\n", name);
1114
1038
}
1127
1051
const char *domain,
1128
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1129
1053
flags,
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1134
1056
1135
1057
/* Called whenever a new services becomes available on the LAN or
1136
1058
is removed from the LAN */
1144
1066
case AVAHI_BROWSER_FAILURE:
1145
1067
1146
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1150
1071
return;
1151
1072
1152
1073
case AVAHI_BROWSER_NEW:
1155
1076
the callback function is called the Avahi server will free the
1156
1077
resolver for us. */
1157
1078
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1162
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
1083
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1084
avahi_strerror(avahi_server_errno(mc.server)));
1166
1085
break;
1167
1086
1168
1087
case AVAHI_BROWSER_REMOVE:
1187
1106
signal_received = sig;
1188
1107
int old_errno = errno;
1189
1108
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1192
1111
}
1193
1112
errno = old_errno;
1194
1113
}
1195
1114
1196
__attribute__((nonnull, warn_unused_result))
1197
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
1116
int ret;
1199
error_t ret_errno;
1200
1117
1201
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1119
if(s < 0){
1203
ret_errno = errno;
1204
1120
perror_plus("socket");
1205
errno = ret_errno;
1206
1121
return false;
1207
1122
}
1208
1123
strcpy(ifr->ifr_name, ifname);
1209
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
1125
if(ret == -1){
1211
1126
if(debug){
1212
ret_errno = errno;
1213
1127
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
1128
}
1216
1129
return false;
1217
1130
}
1218
1131
return true;
1219
1132
}
1220
1133
1221
__attribute__((nonnull, warn_unused_result))
1222
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1135
1224
1136
/* Reject the loopback device */
1266
1178
* corresponds to an acceptable network device.
1267
1179
* (This function is passed to scandir(3) as a filter function.)
1268
1180
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
1181
int good_interface(const struct dirent *if_entry){
1271
1182
if(if_entry->d_name[0] == '.'){
1272
1183
return 0;
1288
1199
}
1289
1200
1290
1201
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1325
1244
int notdotentries(const struct dirent *direntry){
1326
1245
/* Skip "." and ".." */
1327
1246
if(direntry->d_name[0] == '.'
1334
1253
}
1335
1254
1336
1255
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
1256
int runnable_hook(const struct dirent *direntry){
1339
1257
int ret;
1340
1258
size_t sret;
1348
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
1267
"abcdefghijklmnopqrstuvwxyz"
1350
1268
"0123456789"
1351
"_.-");
1269
"_-");
1352
1270
if((direntry->d_name)[sret] != '\0'){
1353
1271
/* Contains non-allowed characters */
1354
1272
if(debug){
1358
1276
return 0;
1359
1277
}
1360
1278
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1362
1287
if(ret == -1){
1363
1288
if(debug){
1364
1289
perror_plus("Could not stat hook");
1388
1313
return 1;
1389
1314
}
1390
1315
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1394
1317
int ret;
1395
1318
struct timespec now;
1396
1319
struct timespec waited_time;
1397
1320
intmax_t block_time;
1398
1321
1399
1322
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1323
if(mc.current_server == NULL){
1324
if (debug){
1402
1325
fprintf_plus(stderr, "Wait until first server is found."
1403
1326
" No timeout!\n");
1404
1327
}
1405
1328
ret = avahi_simple_poll_iterate(s, -1);
1406
1329
} else {
1407
if(debug){
1330
if (debug){
1408
1331
fprintf_plus(stderr, "Check current_server if we should run"
1409
1332
" it, or wait\n");
1410
1333
}
1417
1340
/* Calculating in ms how long time between now and server
1418
1341
who we visted longest time ago. Now - last seen. */
1419
1342
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1343
- mc.current_server->last_seen.tv_sec);
1421
1344
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1345
- mc.current_server->last_seen.tv_nsec);
1423
1346
/* total time is 10s/10,000ms.
1424
1347
Converting to s from ms by dividing by 1,000,
1425
1348
and ns to ms by dividing by 1,000,000. */
1427
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1428
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1352
1430
if(debug){
1353
if (debug){
1431
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
1355
block_time);
1433
1356
}
1434
1357
1435
1358
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1440
1363
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1364
avahi_simple_poll_quit(mc.simple_poll);
1442
1365
return 0;
1443
1366
}
1444
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1368
&mc.current_server->last_seen);
1446
1369
if(ret == -1){
1447
1370
perror_plus("clock_gettime");
1448
1371
return -1;
1449
1372
}
1450
mc->current_server = mc->current_server->next;
1373
mc.current_server = mc.current_server->next;
1451
1374
block_time = 0; /* Call avahi to find new Mandos
1452
1375
servers, but don't block */
1453
1376
}
1455
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
1379
}
1457
1380
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1381
if (ret > 0 or errno != EINTR){
1459
1382
return (ret != 1) ? ret : 0;
1460
1383
}
1461
1384
}
1462
1385
}
1463
1386
}
1464
1387
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1388
bool run_network_hooks(const char *mode, const char *interface,
1519
1389
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1547
1395
if(numhooks == -1){
1548
1396
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1621
1404
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1626
1473
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1673
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1693
}
1694
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1699
int ret;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1702
if(if_index == 0){
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
errno = old_errno;
1705
return ENXIO;
1706
}
1707
1708
if(quit_now){
1709
errno = old_errno;
1710
return EINTR;
1711
}
1712
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1790
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1797
errno = old_errno;
1798
return ioctl_errno;
1799
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
}
1804
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1809
break;
1810
}
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1815
}
1816
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1831
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1878
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1891
}
1892
1893
errno = old_errno;
1894
return 0;
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1895
1515
}
1896
1516
1897
1517
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1902
1518
AvahiSServiceBrowser *sb = NULL;
1903
error_t ret_errno;
1519
int error;
1904
1520
int ret;
1905
1521
intmax_t tmpmax;
1906
1522
char *tmp;
1907
1523
int exitcode = EXIT_SUCCESS;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
1913
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1914
1533
const char *seckey = PATHDIR "/" SECKEY;
1915
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1917
1535
1918
1536
bool gnutls_initialized = false;
1919
1537
bool gpgme_initialized = false;
1981
1599
.group = 2 },
1982
1600
{ .name = "retry", .key = 132,
1983
1601
.arg = "SECONDS",
1984
.doc = "Retry interval used when denied by the Mandos server",
1602
.doc = "Retry interval used when denied by the mandos server",
1985
1603
.group = 2 },
1986
1604
{ .name = "network-hook-dir", .key = 133,
1987
1605
.arg = "DIR",
2010
1628
connect_to = arg;
2011
1629
break;
2012
1630
case 'i': /* --interface */
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
1631
interface = arg;
2018
1632
break;
2019
1633
case 's': /* --seckey */
2020
1634
seckey = arg;
2097
1711
/* Work around Debian bug #633582:
2098
1712
<http://bugs.debian.org/633582> */
2099
1713
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2105
1719
} else {
2106
1720
struct stat st;
2107
1721
2148
1762
}
2149
1763
2150
1764
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2172
1769
}
2173
1770
}
2174
1771
}
2175
1772
2176
1773
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
2182
goto end;
2183
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2186
}
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2189
1776
}
2190
1777
2191
1778
if(not debug){
2192
1779
avahi_set_log_function(empty_log);
2193
1780
}
2194
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
2195
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2196
1815
from the signal handler */
2197
1816
/* Initialize the pseudo-RNG for Avahi */
2198
1817
srand((unsigned int) time(NULL));
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2201
1820
fprintf_plus(stderr,
2202
1821
"Avahi: Failed to create simple poll object.\n");
2203
1822
exitcode = EX_UNAVAILABLE;
2267
1886
}
2268
1887
}
2269
1888
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
2321
1974
}
2322
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
2323
1993
break;
2324
1994
}
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2352
2024
}
2353
2025
2354
2026
if(quit_now){
2355
2027
goto end;
2356
2028
}
2357
2029
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
ret = init_gnutls_global(pubkey, seckey);
2359
2031
if(ret == -1){
2360
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2361
2033
exitcode = EX_UNAVAILABLE;
2368
2040
goto end;
2369
2041
}
2370
2042
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
2043
if(mkdtemp(tempdir) == NULL){
2381
2044
perror_plus("mkdtemp");
2382
2045
goto end;
2383
2046
}
2047
tempdir_created = true;
2384
2048
2385
2049
if(quit_now){
2386
2050
goto end;
2387
2051
}
2388
2052
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2390
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2391
2055
exitcode = EX_UNAVAILABLE;
2392
2056
goto end;
2402
2066
/* Connect directly, do not use Zeroconf */
2403
2067
/* (Mainly meant for debugging) */
2404
2068
char *address = strrchr(connect_to, ':');
2405
2406
2069
if(address == NULL){
2407
2070
fprintf_plus(stderr, "No colon in address\n");
2408
2071
exitcode = EX_USAGE;
2413
2076
goto end;
2414
2077
}
2415
2078
2416
in_port_t port;
2079
uint16_t port;
2417
2080
errno = 0;
2418
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2419
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2420
or tmpmax != (in_port_t)tmpmax){
2083
or tmpmax != (uint16_t)tmpmax){
2421
2084
fprintf_plus(stderr, "Bad port number\n");
2422
2085
exitcode = EX_USAGE;
2423
2086
goto end;
2424
2087
}
2425
2088
2426
2089
if(quit_now){
2427
2090
goto end;
2428
2091
}
2429
2092
2430
port = (in_port_t)tmpmax;
2093
port = (uint16_t)tmpmax;
2431
2094
*address = '\0';
2432
2095
/* Colon in address indicates IPv6 */
2433
2096
int af;
2449
2112
}
2450
2113
2451
2114
while(not quit_now){
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
2115
ret = start_mandos_communication(address, port, if_index, af);
2454
2116
if(quit_now or ret == 0){
2455
2117
break;
2456
2118
}
2458
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
2121
(int)retry_interval);
2460
2122
}
2461
sleep((unsigned int)retry_interval);
2123
sleep((int)retry_interval);
2462
2124
}
2463
2125
2464
if(not quit_now){
2126
if (not quit_now){
2465
2127
exitcode = EXIT_SUCCESS;
2466
2128
}
2467
2129
2482
2144
config.publish_domain = 0;
2483
2145
2484
2146
/* Allocate a new server */
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2487
2150
2488
2151
/* Free the Avahi configuration data */
2489
2152
avahi_server_config_free(&config);
2492
2155
/* Check if creating the Avahi server object succeeded */
2493
2156
if(mc.server == NULL){
2494
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2158
avahi_strerror(error));
2496
2159
exitcode = EX_UNAVAILABLE;
2497
2160
goto end;
2498
2161
}
2504
2167
/* Create the Avahi service browser */
2505
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2506
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
2170
NULL, 0, browse_callback, NULL);
2509
2171
if(sb == NULL){
2510
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
2173
avahi_strerror(avahi_server_errno(mc.server)));
2522
2184
if(debug){
2523
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2524
2186
}
2525
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2528
2190
if(debug){
2529
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
2192
(ret == 0) ? "successfully" : "with error");
2537
2199
}
2538
2200
2539
2201
/* Cleanup things */
2540
free(mc.interfaces);
2541
2542
2202
if(sb != NULL)
2543
2203
avahi_s_service_browser_free(sb);
2544
2204
2545
2205
if(mc.server != NULL)
2546
2206
avahi_server_free(mc.server);
2547
2207
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2550
2210
2551
2211
if(gnutls_initialized){
2552
2212
gnutls_certificate_free_credentials(mc.cred);
2564
2224
mc.current_server->prev->next = NULL;
2565
2225
while(mc.current_server != NULL){
2566
2226
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2575
2227
free(mc.current_server);
2576
2228
mc.current_server = next;
2577
2229
}
2578
2230
}
2579
2231
2580
/* Re-raise privileges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2581
2236
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2609
2241
}
2610
2242
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2615
2259
}
2616
2260
}
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2620
2267
2621
2268
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2269
if(tempdir_created){
2623
2270
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
2661
2290
}
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2663
2301
}
2664
2302
}
2665
2303
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0