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- Committer: teddy at recompile
- Date: 2011-12-27 03:56:39 UTC
- mto: This revision was merged to the branch mainline in revision 541.
- Revision ID: teddy@recompile.se-20111227035639-hvvgrqchckawlg02
Add wireless network hook
* network-hooks.s/bridge: Use canonical syntax for "ip" command.
* network-hooks.s/wireless: New.
* network-hooks.s/wireless.conf: - '' -
* plugins.d/mandos-client.c (run_network_hooks): Add new "CONNECT"
environment variable.
* plugins.d/mandos-client.xml (NETWORK HOOKS/REQUIREMENTS): Document
"CONNECT"
environment
variable.
* network-hooks.s/bridge: Use canonical syntax for "ip" command.
* network-hooks.s/wireless: New.
* network-hooks.s/wireless.conf: - '' -
* plugins.d/mandos-client.c (run_network_hooks): Add new "CONNECT"
environment variable.
* plugins.d/mandos-client.xml (NETWORK HOOKS/REQUIREMENTS): Document
"CONNECT"
environment
variable.
- 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;
185
177
perror(print_text);
186
178
}
187
179
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
189
181
int fprintf_plus(FILE *stream, const char *format, ...){
190
182
va_list ap;
191
183
va_start (ap, format);
192
184
193
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
186
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
188
}
197
189
198
190
/*
200
192
* bytes. "buffer_capacity" is how much is currently allocated,
201
193
* "buffer_length" is how much is already used.
202
194
*/
203
__attribute__((nonnull, warn_unused_result))
204
195
size_t incbuffer(char **buffer, size_t buffer_length,
205
196
size_t buffer_capacity){
206
197
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;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
213
200
return 0;
214
201
}
215
*buffer = new_buf;
216
202
buffer_capacity += BUFFER_SIZE;
217
203
}
218
204
return buffer_capacity;
219
205
}
220
206
221
207
/* 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){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
225
210
int ret;
226
211
server *new_server = malloc(sizeof(server));
227
212
if(new_server == NULL){
234
219
.af = af };
235
220
if(new_server->ip == NULL){
236
221
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
222
return false;
253
223
}
254
224
/* Special case of first server */
255
if(*current_server == NULL){
225
if (mc.current_server == NULL){
256
226
new_server->next = new_server;
257
227
new_server->prev = new_server;
258
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
259
230
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
263
233
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
265
240
}
266
241
return true;
267
242
}
269
244
/*
270
245
* Initialize GPGME.
271
246
*/
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){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
277
249
gpgme_error_t rc;
278
250
gpgme_engine_info_t engine_info;
279
251
252
280
253
/*
281
254
* Helper function to insert pub and seckey to the engine keyring.
282
255
*/
283
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
284
257
int ret;
285
258
int fd;
286
259
gpgme_data_t pgp_data;
298
271
return false;
299
272
}
300
273
301
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
302
275
if(rc != GPG_ERR_NO_ERROR){
303
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
277
gpgme_strsource(rc), gpgme_strerror(rc));
348
321
}
349
322
350
323
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
352
325
if(rc != GPG_ERR_NO_ERROR){
353
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
340
* Decrypt OpenPGP data.
368
341
* Returns -1 on error
369
342
*/
370
__attribute__((nonnull, warn_unused_result))
371
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
344
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
345
char **plaintext){
375
346
gpgme_data_t dh_crypto, dh_plain;
376
347
gpgme_error_t rc;
377
348
ssize_t ret;
403
374
404
375
/* Decrypt data from the cryptotext data buffer to the plaintext
405
376
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
378
if(rc != GPG_ERR_NO_ERROR){
408
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
380
gpgme_strsource(rc), gpgme_strerror(rc));
410
381
plaintext_length = -1;
411
382
if(debug){
412
383
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
414
385
if(result == NULL){
415
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
387
} else {
493
464
return plaintext_length;
494
465
}
495
466
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
499
470
if(ret == NULL)
500
471
ret = "(unknown)";
501
472
return ret;
502
473
}
503
474
504
475
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
476
static void debuggnutls(__attribute__((unused)) int level,
507
477
const char* string){
508
478
fprintf_plus(stderr, "GnuTLS: %s", string);
509
479
}
510
480
511
__attribute__((nonnull, warn_unused_result))
512
481
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
482
const char *seckeyfilename){
515
483
int ret;
516
484
517
485
if(debug){
534
502
}
535
503
536
504
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
506
if(ret != GNUTLS_E_SUCCESS){
539
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
508
safer_gnutls_strerror(ret));
550
518
}
551
519
552
520
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
554
522
GNUTLS_OPENPGP_FMT_BASE64);
555
523
if(ret != GNUTLS_E_SUCCESS){
556
524
fprintf_plus(stderr,
562
530
}
563
531
564
532
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
566
534
if(ret != GNUTLS_E_SUCCESS){
567
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
536
" initialization: %s\n",
569
537
safer_gnutls_strerror(ret));
570
538
goto globalfail;
571
539
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
541
if(ret != GNUTLS_E_SUCCESS){
574
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
543
safer_gnutls_strerror(ret));
576
544
goto globalfail;
577
545
}
578
546
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
548
581
549
return 0;
582
550
583
551
globalfail:
584
552
585
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
586
554
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
588
556
return -1;
589
557
}
590
558
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
594
560
int ret;
595
561
/* GnuTLS session creation */
596
562
do {
608
574
{
609
575
const char *err;
610
576
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
578
if(quit_now){
613
579
gnutls_deinit(*session);
614
580
return -1;
625
591
626
592
do {
627
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
594
mc.cred);
629
595
if(quit_now){
630
596
gnutls_deinit(*session);
631
597
return -1;
641
607
/* ignore client certificate if any. */
642
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
609
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
611
646
612
return 0;
647
613
}
651
617
__attribute__((unused)) const char *txt){}
652
618
653
619
/* 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,
620
static int start_mandos_communication(const char *ip, uint16_t port,
656
621
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
622
int af){
658
623
int ret, tcp_sd = -1;
659
624
ssize_t sret;
660
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
661
629
char *buffer = NULL;
662
630
char *decrypted_buffer = NULL;
663
631
size_t buffer_length = 0;
687
655
return -1;
688
656
}
689
657
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);
658
ret = init_gnutls_session(&session);
723
659
if(ret != 0){
724
660
return -1;
725
661
}
726
662
727
663
if(debug){
728
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
730
666
}
731
667
732
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
680
745
681
memset(&to, 0, sizeof(to));
746
682
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);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
685
} 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);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
752
688
}
753
689
if(ret < 0 ){
754
690
int e = errno;
763
699
goto mandos_end;
764
700
}
765
701
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)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
769
709
if(if_index == AVAHI_IF_UNSPEC){
770
710
fprintf_plus(stderr, "An IPv6 link-local address is"
771
711
" incomplete without a network interface\n");
773
713
goto mandos_end;
774
714
}
775
715
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
777
717
}
778
718
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
780
722
}
781
723
782
724
if(quit_now){
790
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
733
perror_plus("if_indextoname");
792
734
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
795
737
}
796
738
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
799
741
}
800
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
802
745
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
807
748
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
812
751
}
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);
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
819
758
}
820
759
}
821
760
825
764
}
826
765
827
766
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
768
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
770
}
834
771
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
773
int e = errno;
837
774
perror_plus("connect");
838
775
errno = e;
884
821
goto mandos_end;
885
822
}
886
823
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);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
892
826
893
827
if(quit_now){
894
828
errno = EINTR;
999
933
if(buffer_length > 0){
1000
934
ssize_t decrypted_buffer_size;
1001
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
936
&decrypted_buffer);
1003
937
if(decrypted_buffer_size >= 0){
1004
938
1005
939
written = 0;
1053
987
return retval;
1054
988
}
1055
989
1056
__attribute__((nonnull))
1057
990
static void resolve_callback(AvahiSServiceResolver *r,
1058
991
AvahiIfIndex interface,
1059
992
AvahiProtocol proto,
1067
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
1002
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1074
1005
1075
1006
/* Called whenever a service has been resolved successfully or
1076
1007
timed out */
1077
1008
1078
1009
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
1010
return;
1081
1011
}
1082
1012
1086
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
1018
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1019
avahi_strerror(avahi_server_errno(mc.server)));
1091
1020
break;
1092
1021
1093
1022
case AVAHI_RESOLVER_FOUND:
1099
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
1029
host_name, ip, (intmax_t)interface, port);
1101
1030
}
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1106
1033
if(ret == 0){
1107
avahi_simple_poll_quit(simple_poll);
1034
avahi_simple_poll_quit(mc.simple_poll);
1108
1035
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1112
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
1039
" list\n", name);
1114
1040
}
1127
1053
const char *domain,
1128
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1129
1055
flags,
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1134
1058
1135
1059
/* Called whenever a new services becomes available on the LAN or
1136
1060
is removed from the LAN */
1144
1068
case AVAHI_BROWSER_FAILURE:
1145
1069
1146
1070
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);
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1150
1073
return;
1151
1074
1152
1075
case AVAHI_BROWSER_NEW:
1155
1078
the callback function is called the Avahi server will free the
1156
1079
resolver for us. */
1157
1080
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)
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1162
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
1085
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1086
avahi_strerror(avahi_server_errno(mc.server)));
1166
1087
break;
1167
1088
1168
1089
case AVAHI_BROWSER_REMOVE:
1187
1108
signal_received = sig;
1188
1109
int old_errno = errno;
1189
1110
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1192
1113
}
1193
1114
errno = old_errno;
1194
1115
}
1195
1116
1196
__attribute__((nonnull, warn_unused_result))
1197
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
1118
int ret;
1199
error_t ret_errno;
1200
1119
1201
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1121
if(s < 0){
1203
ret_errno = errno;
1204
1122
perror_plus("socket");
1205
errno = ret_errno;
1206
1123
return false;
1207
1124
}
1208
1125
strcpy(ifr->ifr_name, ifname);
1209
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
1127
if(ret == -1){
1211
1128
if(debug){
1212
ret_errno = errno;
1213
1129
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
1130
}
1216
1131
return false;
1217
1132
}
1218
1133
return true;
1219
1134
}
1220
1135
1221
__attribute__((nonnull, warn_unused_result))
1222
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1137
1224
1138
/* Reject the loopback device */
1266
1180
* corresponds to an acceptable network device.
1267
1181
* (This function is passed to scandir(3) as a filter function.)
1268
1182
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
1183
int good_interface(const struct dirent *if_entry){
1271
1184
if(if_entry->d_name[0] == '.'){
1272
1185
return 0;
1288
1201
}
1289
1202
1290
1203
/*
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))
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1325
1246
int notdotentries(const struct dirent *direntry){
1326
1247
/* Skip "." and ".." */
1327
1248
if(direntry->d_name[0] == '.'
1334
1255
}
1335
1256
1336
1257
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
1258
int runnable_hook(const struct dirent *direntry){
1339
1259
int ret;
1340
1260
size_t sret;
1348
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
1269
"abcdefghijklmnopqrstuvwxyz"
1350
1270
"0123456789"
1351
"_.-");
1271
"_-");
1352
1272
if((direntry->d_name)[sret] != '\0'){
1353
1273
/* Contains non-allowed characters */
1354
1274
if(debug){
1358
1278
return 0;
1359
1279
}
1360
1280
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1362
1289
if(ret == -1){
1363
1290
if(debug){
1364
1291
perror_plus("Could not stat hook");
1388
1315
return 1;
1389
1316
}
1390
1317
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1394
1319
int ret;
1395
1320
struct timespec now;
1396
1321
struct timespec waited_time;
1397
1322
intmax_t block_time;
1398
1323
1399
1324
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1325
if(mc.current_server == NULL){
1326
if (debug){
1402
1327
fprintf_plus(stderr, "Wait until first server is found."
1403
1328
" No timeout!\n");
1404
1329
}
1405
1330
ret = avahi_simple_poll_iterate(s, -1);
1406
1331
} else {
1407
if(debug){
1332
if (debug){
1408
1333
fprintf_plus(stderr, "Check current_server if we should run"
1409
1334
" it, or wait\n");
1410
1335
}
1417
1342
/* Calculating in ms how long time between now and server
1418
1343
who we visted longest time ago. Now - last seen. */
1419
1344
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1345
- mc.current_server->last_seen.tv_sec);
1421
1346
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1347
- mc.current_server->last_seen.tv_nsec);
1423
1348
/* total time is 10s/10,000ms.
1424
1349
Converting to s from ms by dividing by 1,000,
1425
1350
and ns to ms by dividing by 1,000,000. */
1427
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1428
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1354
1430
if(debug){
1355
if (debug){
1431
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
1357
block_time);
1433
1358
}
1434
1359
1435
1360
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);
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1440
1365
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1366
avahi_simple_poll_quit(mc.simple_poll);
1442
1367
return 0;
1443
1368
}
1444
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1370
&mc.current_server->last_seen);
1446
1371
if(ret == -1){
1447
1372
perror_plus("clock_gettime");
1448
1373
return -1;
1449
1374
}
1450
mc->current_server = mc->current_server->next;
1375
mc.current_server = mc.current_server->next;
1451
1376
block_time = 0; /* Call avahi to find new Mandos
1452
1377
servers, but don't block */
1453
1378
}
1455
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
1381
}
1457
1382
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1383
if (ret > 0 or errno != EINTR){
1459
1384
return (ret != 1) ? ret : 0;
1460
1385
}
1461
1386
}
1462
1387
}
1463
1388
}
1464
1389
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,
1390
bool run_network_hooks(const char *mode, const char *interface,
1519
1391
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__ */
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1547
1397
if(numhooks == -1){
1548
1398
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){
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1621
1406
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1626
1475
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
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1678
} else {
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1698
}
1699
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
1704
int ret;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1707
if(if_index == 0){
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1709
errno = old_errno;
1710
return ENXIO;
1711
}
1712
1713
if(quit_now){
1714
errno = old_errno;
1715
return EINTR;
1716
}
1717
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1721
ret_errno = errno;
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1725
return ret_errno;
1726
}
1727
network.ifr_flags |= IFF_UP; /* set flag */
1728
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1731
ret_errno = errno;
1732
perror_plus("socket");
1733
errno = old_errno;
1734
return ret_errno;
1735
}
1736
1737
if(quit_now){
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
errno = old_errno;
1743
return EINTR;
1744
}
1745
1746
if(debug){
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1748
interface);
1749
}
1750
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1757
1758
#ifdef __linux__
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1770
}
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1774
#ifdef __linux__
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1779
}
1780
}
1781
#endif /* __linux__ */
1782
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1792
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1795
if(ret == -1){
1796
perror_plus("close");
1797
}
1798
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1802
errno = old_errno;
1803
return ioctl_errno;
1804
}
1805
} else if(debug){
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1807
interface);
1808
}
1809
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1814
break;
1815
}
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1820
}
1821
}
1822
1823
errno = old_errno;
1824
return 0;
1825
}
1826
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1832
if(if_index == 0){
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1834
errno = old_errno;
1835
return ENXIO;
1836
}
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1840
ret_errno = errno;
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1844
return ret_errno;
1845
}
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1847
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1850
ret_errno = errno;
1851
perror_plus("socket");
1852
errno = old_errno;
1853
return ret_errno;
1854
}
1855
1856
if(debug){
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1858
interface);
1859
}
1860
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1880
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1883
if(ret == -1){
1884
perror_plus("close");
1885
}
1886
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1890
errno = old_errno;
1891
return ioctl_errno;
1892
}
1893
} else if(debug){
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1895
interface);
1896
}
1897
1898
errno = old_errno;
1899
return 0;
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1900
1524
}
1901
1525
1902
1526
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1907
1527
AvahiSServiceBrowser *sb = NULL;
1908
error_t ret_errno;
1528
int error;
1909
1529
int ret;
1910
1530
intmax_t tmpmax;
1911
1531
char *tmp;
1912
1532
int exitcode = EXIT_SUCCESS;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1918
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1919
1542
const char *seckey = PATHDIR "/" SECKEY;
1920
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
1922
1544
1923
1545
bool gnutls_initialized = false;
1924
1546
bool gpgme_initialized = false;
2015
1637
connect_to = arg;
2016
1638
break;
2017
1639
case 'i': /* --interface */
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
2020
if(ret_errno != 0){
2021
argp_error(state, "%s", strerror(ret_errno));
2022
}
1640
interface = arg;
2023
1641
break;
2024
1642
case 's': /* --seckey */
2025
1643
seckey = arg;
2102
1720
/* Work around Debian bug #633582:
2103
1721
<http://bugs.debian.org/633582> */
2104
1722
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2110
1728
} else {
2111
1729
struct stat st;
2112
1730
2153
1771
}
2154
1772
2155
1773
/* Lower privileges */
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2160
}
2161
}
2162
}
2163
2164
/* Remove invalid interface names (except "none") */
2165
{
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2168
interface))){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2174
}
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
interface = NULL;
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2177
1778
}
2178
1779
}
2179
1780
}
2180
1781
2181
1782
/* Run network hooks */
2182
{
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
2187
goto end;
2188
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2194
1785
}
2195
1786
2196
1787
if(not debug){
2197
1788
avahi_set_log_function(empty_log);
2198
1789
}
2199
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
2200
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2201
1824
from the signal handler */
2202
1825
/* Initialize the pseudo-RNG for Avahi */
2203
1826
srand((unsigned int) time(NULL));
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2206
1829
fprintf_plus(stderr,
2207
1830
"Avahi: Failed to create simple poll object.\n");
2208
1831
exitcode = EX_UNAVAILABLE;
2272
1895
}
2273
1896
}
2274
1897
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2280
alphasort);
2281
if(ret >= 1){
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2290
continue;
2291
}
2292
if(debug){
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2295
}
2296
free(direntries[i]);
2297
}
2298
free(direntries);
2299
} else {
2300
if(ret == 0){
2301
free(direntries);
2302
}
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2305
goto end;
2306
}
2307
}
2308
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2326
1983
}
2327
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2328
2002
break;
2329
2003
}
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2333
if(errno != 0){
2334
perror_plus("Failed to bring up interface");
2335
} else {
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2342
}
2343
}
2344
}
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2347
}
2348
}
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2357
2033
}
2358
2034
2359
2035
if(quit_now){
2360
2036
goto end;
2361
2037
}
2362
2038
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2039
ret = init_gnutls_global(pubkey, seckey);
2364
2040
if(ret == -1){
2365
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2366
2042
exitcode = EX_UNAVAILABLE;
2373
2049
goto end;
2374
2050
}
2375
2051
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2052
if(mkdtemp(tempdir) == NULL){
2386
2053
perror_plus("mkdtemp");
2387
2054
goto end;
2388
2055
}
2056
tempdir_created = true;
2389
2057
2390
2058
if(quit_now){
2391
2059
goto end;
2392
2060
}
2393
2061
2394
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2395
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2396
2064
exitcode = EX_UNAVAILABLE;
2397
2065
goto end;
2407
2075
/* Connect directly, do not use Zeroconf */
2408
2076
/* (Mainly meant for debugging) */
2409
2077
char *address = strrchr(connect_to, ':');
2410
2411
2078
if(address == NULL){
2412
2079
fprintf_plus(stderr, "No colon in address\n");
2413
2080
exitcode = EX_USAGE;
2418
2085
goto end;
2419
2086
}
2420
2087
2421
in_port_t port;
2088
uint16_t port;
2422
2089
errno = 0;
2423
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2424
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2425
or tmpmax != (in_port_t)tmpmax){
2092
or tmpmax != (uint16_t)tmpmax){
2426
2093
fprintf_plus(stderr, "Bad port number\n");
2427
2094
exitcode = EX_USAGE;
2428
2095
goto end;
2429
2096
}
2430
2097
2431
2098
if(quit_now){
2432
2099
goto end;
2433
2100
}
2434
2101
2435
port = (in_port_t)tmpmax;
2102
port = (uint16_t)tmpmax;
2436
2103
*address = '\0';
2437
2104
/* Colon in address indicates IPv6 */
2438
2105
int af;
2454
2121
}
2455
2122
2456
2123
while(not quit_now){
2457
ret = start_mandos_communication(address, port, if_index, af,
2458
&mc);
2124
ret = start_mandos_communication(address, port, if_index, af);
2459
2125
if(quit_now or ret == 0){
2460
2126
break;
2461
2127
}
2463
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2464
2130
(int)retry_interval);
2465
2131
}
2466
sleep((unsigned int)retry_interval);
2132
sleep((int)retry_interval);
2467
2133
}
2468
2134
2469
if(not quit_now){
2135
if (not quit_now){
2470
2136
exitcode = EXIT_SUCCESS;
2471
2137
}
2472
2138
2487
2153
config.publish_domain = 0;
2488
2154
2489
2155
/* Allocate a new server */
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2491
&config, NULL, NULL, &ret_errno);
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2492
2159
2493
2160
/* Free the Avahi configuration data */
2494
2161
avahi_server_config_free(&config);
2497
2164
/* Check if creating the Avahi server object succeeded */
2498
2165
if(mc.server == NULL){
2499
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2500
avahi_strerror(ret_errno));
2167
avahi_strerror(error));
2501
2168
exitcode = EX_UNAVAILABLE;
2502
2169
goto end;
2503
2170
}
2509
2176
/* Create the Avahi service browser */
2510
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2511
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2512
NULL, 0, browse_callback,
2513
(void *)&mc);
2179
NULL, 0, browse_callback, NULL);
2514
2180
if(sb == NULL){
2515
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2516
2182
avahi_strerror(avahi_server_errno(mc.server)));
2527
2193
if(debug){
2528
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2529
2195
}
2530
2531
ret = avahi_loop_with_timeout(simple_poll,
2532
(int)(retry_interval * 1000), &mc);
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2533
2199
if(debug){
2534
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2535
2201
(ret == 0) ? "successfully" : "with error");
2542
2208
}
2543
2209
2544
2210
/* Cleanup things */
2545
free(mc.interfaces);
2546
2547
2211
if(sb != NULL)
2548
2212
avahi_s_service_browser_free(sb);
2549
2213
2550
2214
if(mc.server != NULL)
2551
2215
avahi_server_free(mc.server);
2552
2216
2553
if(simple_poll != NULL)
2554
avahi_simple_poll_free(simple_poll);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2555
2219
2556
2220
if(gnutls_initialized){
2557
2221
gnutls_certificate_free_credentials(mc.cred);
2569
2233
mc.current_server->prev->next = NULL;
2570
2234
while(mc.current_server != NULL){
2571
2235
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2580
2236
free(mc.current_server);
2581
2237
mc.current_server = next;
2582
2238
}
2583
2239
}
2584
2240
2585
/* Re-raise privileges */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2586
2245
{
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2614
2250
}
2615
2251
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
2620
2268
}
2621
2269
}
2622
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2625
2276
2626
2277
/* Removes the GPGME temp directory and all files inside */
2627
if(tempdir != NULL){
2278
if(tempdir_created){
2628
2279
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2666
2299
}
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2668
2310
}
2669
2311
}
2670
2312
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0