(root)/mandos/release
» Revision
237.7.254
(compared to revision 237.7.79)
: plugins.d/mandos-client.c
To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.7.254
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.254
- Committer: Teddy Hogeborn
- Date: 2014-06-15 01:01:14 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140615010114-fzz32p5naoo8nket
mandos-client: Better error messages.
* Makefile (run-client): Update message to match current messages.
Also set GNOME_KEYRING_CONTROL to empty
string to block pam_gnome_keyring.
* plugins.d/mandos-client (raise_privileges): Do not print errors.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(run_network_hooks): Print errors from above functions correctly.
(bring_up_interface, take_down_interface, main): - '' -
* Makefile (run-client): Update message to match current messages.
Also set GNOME_KEYRING_CONTROL to empty
string to block pam_gnome_keyring.
* plugins.d/mandos-client (raise_privileges): Do not print errors.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(run_network_hooks): Print errors from above functions correctly.
(bring_up_interface, take_down_interface, main): - '' -
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
170
178
171
179
/* Function to use when printing errors */
172
180
void perror_plus(const char *print_text){
181
int e = errno;
173
182
fprintf(stderr, "Mandos plugin %s: ",
174
183
program_invocation_short_name);
184
errno = e;
175
185
perror(print_text);
176
186
}
177
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
189
int fprintf_plus(FILE *stream, const char *format, ...){
179
190
va_list ap;
180
191
va_start (ap, format);
181
192
182
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
194
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
196
}
186
197
187
198
/*
189
200
* bytes. "buffer_capacity" is how much is currently allocated,
190
201
* "buffer_length" is how much is already used.
191
202
*/
203
__attribute__((nonnull, warn_unused_result))
192
204
size_t incbuffer(char **buffer, size_t buffer_length,
193
205
size_t buffer_capacity){
194
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
197
213
return 0;
198
214
}
215
*buffer = new_buf;
199
216
buffer_capacity += BUFFER_SIZE;
200
217
}
201
218
return buffer_capacity;
202
219
}
203
220
204
221
/* Add server to set of servers to retry periodically */
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
207
225
int ret;
208
226
server *new_server = malloc(sizeof(server));
209
227
if(new_server == NULL){
218
236
perror_plus("strdup");
219
237
return false;
220
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
221
244
/* Special case of first server */
222
if (mc.current_server == NULL){
245
if(*current_server == NULL){
223
246
new_server->next = new_server;
224
247
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
248
*current_server = new_server;
227
249
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
230
253
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
254
(*current_server)->prev = new_server;
237
255
}
238
256
return true;
239
257
}
241
259
/*
242
260
* Initialize GPGME.
243
261
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
246
267
gpgme_error_t rc;
247
268
gpgme_engine_info_t engine_info;
248
269
249
250
270
/*
251
271
* Helper function to insert pub and seckey to the engine keyring.
252
272
*/
253
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
254
274
int ret;
255
275
int fd;
256
276
gpgme_data_t pgp_data;
268
288
return false;
269
289
}
270
290
271
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
272
292
if(rc != GPG_ERR_NO_ERROR){
273
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
294
gpgme_strsource(rc), gpgme_strerror(rc));
318
338
}
319
339
320
340
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
322
342
if(rc != GPG_ERR_NO_ERROR){
323
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
357
* Decrypt OpenPGP data.
338
358
* Returns -1 on error
339
359
*/
360
__attribute__((nonnull, warn_unused_result))
340
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
362
size_t crypto_size,
342
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
343
365
gpgme_data_t dh_crypto, dh_plain;
344
366
gpgme_error_t rc;
345
367
ssize_t ret;
371
393
372
394
/* Decrypt data from the cryptotext data buffer to the plaintext
373
395
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
397
if(rc != GPG_ERR_NO_ERROR){
376
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
399
gpgme_strsource(rc), gpgme_strerror(rc));
378
400
plaintext_length = -1;
379
401
if(debug){
380
402
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
382
404
if(result == NULL){
383
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
406
} else {
461
483
return plaintext_length;
462
484
}
463
485
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
467
489
if(ret == NULL)
468
490
ret = "(unknown)";
469
491
return ret;
470
492
}
471
493
472
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
473
496
static void debuggnutls(__attribute__((unused)) int level,
474
497
const char* string){
475
498
fprintf_plus(stderr, "GnuTLS: %s", string);
476
499
}
477
500
501
__attribute__((nonnull, warn_unused_result))
478
502
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
480
505
int ret;
481
506
482
507
if(debug){
499
524
}
500
525
501
526
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
528
if(ret != GNUTLS_E_SUCCESS){
504
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
530
safer_gnutls_strerror(ret));
515
540
}
516
541
517
542
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
519
544
GNUTLS_OPENPGP_FMT_BASE64);
520
545
if(ret != GNUTLS_E_SUCCESS){
521
546
fprintf_plus(stderr,
527
552
}
528
553
529
554
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
531
556
if(ret != GNUTLS_E_SUCCESS){
532
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
558
" initialization: %s\n",
534
559
safer_gnutls_strerror(ret));
535
560
goto globalfail;
536
561
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
563
if(ret != GNUTLS_E_SUCCESS){
539
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
565
safer_gnutls_strerror(ret));
541
566
goto globalfail;
542
567
}
543
568
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
570
546
571
return 0;
547
572
548
573
globalfail:
549
574
550
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
551
576
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
553
578
return -1;
554
579
}
555
580
556
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
557
584
int ret;
558
585
/* GnuTLS session creation */
559
586
do {
571
598
{
572
599
const char *err;
573
600
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
602
if(quit_now){
576
603
gnutls_deinit(*session);
577
604
return -1;
588
615
589
616
do {
590
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
618
mc->cred);
592
619
if(quit_now){
593
620
gnutls_deinit(*session);
594
621
return -1;
604
631
/* ignore client certificate if any. */
605
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
633
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
635
609
636
return 0;
610
637
}
614
641
__attribute__((unused)) const char *txt){}
615
642
616
643
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
618
646
AvahiIfIndex if_index,
619
int af){
647
int af, mandos_context *mc){
620
648
int ret, tcp_sd = -1;
621
649
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
650
struct sockaddr_storage to;
626
651
char *buffer = NULL;
627
652
char *decrypted_buffer = NULL;
628
653
size_t buffer_length = 0;
652
677
return -1;
653
678
}
654
679
655
ret = init_gnutls_session(&session);
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
656
713
if(ret != 0){
657
714
return -1;
658
715
}
659
716
660
717
if(debug){
661
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
719
PRIuMAX "\n", ip, (uintmax_t)port);
663
720
}
664
721
665
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
677
734
678
735
memset(&to, 0, sizeof(to));
679
736
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
682
739
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
685
742
}
686
743
if(ret < 0 ){
687
744
int e = errno;
696
753
goto mandos_end;
697
754
}
698
755
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
759
if(if_index == AVAHI_IF_UNSPEC){
707
760
fprintf_plus(stderr, "An IPv6 link-local address is"
708
761
" incomplete without a network interface\n");
710
763
goto mandos_end;
711
764
}
712
765
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
767
}
715
768
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
770
}
720
771
721
772
if(quit_now){
729
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
781
perror_plus("if_indextoname");
731
782
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
734
785
}
735
786
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
738
789
}
739
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
792
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
745
797
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
748
802
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
809
}
756
810
}
757
811
761
815
}
762
816
763
817
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
765
820
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
767
823
}
768
824
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
826
int e = errno;
771
827
perror_plus("connect");
772
828
errno = e;
818
874
goto mandos_end;
819
875
}
820
876
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
882
824
883
if(quit_now){
825
884
errno = EINTR;
930
989
if(buffer_length > 0){
931
990
ssize_t decrypted_buffer_size;
932
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
992
&decrypted_buffer, mc);
934
993
if(decrypted_buffer_size >= 0){
935
994
936
995
written = 0;
984
1043
return retval;
985
1044
}
986
1045
1046
__attribute__((nonnull))
987
1047
static void resolve_callback(AvahiSServiceResolver *r,
988
1048
AvahiIfIndex interface,
989
1049
AvahiProtocol proto,
997
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1059
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1002
1064
1003
1065
/* Called whenever a service has been resolved successfully or
1004
1066
timed out */
1013
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1077
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1017
1080
break;
1018
1081
1019
1082
case AVAHI_RESOLVER_FOUND:
1025
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1089
host_name, ip, (intmax_t)interface, port);
1027
1090
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1030
1095
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1032
1097
} else {
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1035
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
1102
" list\n", name);
1037
1103
}
1050
1116
const char *domain,
1051
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1052
1118
flags,
1053
AVAHI_GCC_UNUSED void* userdata){
1054
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1055
1123
1056
1124
/* Called whenever a new services becomes available on the LAN or
1057
1125
is removed from the LAN */
1065
1133
case AVAHI_BROWSER_FAILURE:
1066
1134
1067
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1070
1139
return;
1071
1140
1072
1141
case AVAHI_BROWSER_NEW:
1075
1144
the callback function is called the Avahi server will free the
1076
1145
resolver for us. */
1077
1146
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
name, type, domain, protocol, 0,
1080
resolve_callback, NULL) == NULL)
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1081
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
1152
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1084
1155
break;
1085
1156
1086
1157
case AVAHI_BROWSER_REMOVE:
1105
1176
signal_received = sig;
1106
1177
int old_errno = errno;
1107
1178
/* set main loop to exit */
1108
if(mc.simple_poll != NULL){
1109
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1110
1181
}
1111
1182
errno = old_errno;
1112
1183
}
1113
1184
1185
__attribute__((nonnull, warn_unused_result))
1114
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
1187
int ret;
1188
error_t ret_errno;
1116
1189
1117
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
1191
if(s < 0){
1192
ret_errno = errno;
1119
1193
perror_plus("socket");
1194
errno = ret_errno;
1120
1195
return false;
1121
1196
}
1122
1197
strcpy(ifr->ifr_name, ifname);
1123
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
1199
if(ret == -1){
1125
1200
if(debug){
1201
ret_errno = errno;
1126
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1127
1204
}
1128
1205
return false;
1129
1206
}
1130
1207
return true;
1131
1208
}
1132
1209
1210
__attribute__((nonnull, warn_unused_result))
1133
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1212
1135
1213
/* Reject the loopback device */
1177
1255
* corresponds to an acceptable network device.
1178
1256
* (This function is passed to scandir(3) as a filter function.)
1179
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1180
1259
int good_interface(const struct dirent *if_entry){
1181
1260
if(if_entry->d_name[0] == '.'){
1182
1261
return 0;
1198
1277
}
1199
1278
1200
1279
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1243
1314
int notdotentries(const struct dirent *direntry){
1244
1315
/* Skip "." and ".." */
1245
1316
if(direntry->d_name[0] == '.'
1252
1323
}
1253
1324
1254
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1255
1327
int runnable_hook(const struct dirent *direntry){
1256
1328
int ret;
1257
1329
size_t sret;
1265
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
1338
"abcdefghijklmnopqrstuvwxyz"
1267
1339
"0123456789"
1268
"_-");
1340
"_.-");
1269
1341
if((direntry->d_name)[sret] != '\0'){
1270
1342
/* Contains non-allowed characters */
1271
1343
if(debug){
1275
1347
return 0;
1276
1348
}
1277
1349
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1286
1351
if(ret == -1){
1287
1352
if(debug){
1288
1353
perror_plus("Could not stat hook");
1312
1377
return 1;
1313
1378
}
1314
1379
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1316
1383
int ret;
1317
1384
struct timespec now;
1318
1385
struct timespec waited_time;
1319
1386
intmax_t block_time;
1320
1387
1321
1388
while(true){
1322
if(mc.current_server == NULL){
1323
if (debug){
1389
if(mc->current_server == NULL){
1390
if(debug){
1324
1391
fprintf_plus(stderr, "Wait until first server is found."
1325
1392
" No timeout!\n");
1326
1393
}
1327
1394
ret = avahi_simple_poll_iterate(s, -1);
1328
1395
} else {
1329
if (debug){
1396
if(debug){
1330
1397
fprintf_plus(stderr, "Check current_server if we should run"
1331
1398
" it, or wait\n");
1332
1399
}
1339
1406
/* Calculating in ms how long time between now and server
1340
1407
who we visted longest time ago. Now - last seen. */
1341
1408
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1343
1410
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1345
1412
/* total time is 10s/10,000ms.
1346
1413
Converting to s from ms by dividing by 1,000,
1347
1414
and ns to ms by dividing by 1,000,000. */
1349
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1350
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1351
1418
1352
if (debug){
1419
if(debug){
1353
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
1421
block_time);
1355
1422
}
1356
1423
1357
1424
if(block_time <= 0){
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1362
1429
if(ret == 0){
1363
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1364
1431
return 0;
1365
1432
}
1366
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1368
1435
if(ret == -1){
1369
1436
perror_plus("clock_gettime");
1370
1437
return -1;
1371
1438
}
1372
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1373
1440
block_time = 0; /* Call avahi to find new Mandos
1374
1441
servers, but don't block */
1375
1442
}
1377
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1378
1445
}
1379
1446
if(ret != 0){
1380
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1381
1448
return (ret != 1) ? ret : 0;
1382
1449
}
1383
1450
}
1384
1451
}
1385
1452
}
1386
1453
1387
bool run_network_hooks(const char *mode, const char *interface,
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1388
1508
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1394
1536
if(numhooks == -1){
1395
1537
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1403
1610
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1472
1615
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1512
1879
}
1513
1880
1514
1881
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1515
1886
AvahiSServiceBrowser *sb = NULL;
1516
int error;
1887
error_t ret_errno;
1517
1888
int ret;
1518
1889
intmax_t tmpmax;
1519
1890
char *tmp;
1520
1891
int exitcode = EXIT_SUCCESS;
1521
const char *interface = "";
1522
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
1525
uid_t uid;
1526
gid_t gid;
1527
char tempdir[] = "/tmp/mandosXXXXXX";
1528
bool tempdir_created = false;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1529
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
1898
const char *seckey = PATHDIR "/" SECKEY;
1531
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1532
1901
1533
1902
bool gnutls_initialized = false;
1534
1903
bool gpgme_initialized = false;
1596
1965
.group = 2 },
1597
1966
{ .name = "retry", .key = 132,
1598
1967
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1968
.doc = "Retry interval used when denied by the Mandos server",
1600
1969
.group = 2 },
1601
1970
{ .name = "network-hook-dir", .key = 133,
1602
1971
.arg = "DIR",
1625
1994
connect_to = arg;
1626
1995
break;
1627
1996
case 'i': /* --interface */
1628
interface = arg;
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1629
2002
break;
1630
2003
case 's': /* --seckey */
1631
2004
seckey = arg;
1708
2081
/* Work around Debian bug #633582:
1709
2082
<http://bugs.debian.org/633582> */
1710
2083
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
1716
2089
} else {
1717
2090
struct stat st;
1718
2091
1759
2132
}
1760
2133
1761
2134
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
1766
2156
}
1767
2157
}
1768
2158
}
1769
2159
1770
2160
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
1773
2173
}
1774
2174
1775
2175
if(not debug){
1776
2176
avahi_set_log_function(empty_log);
1777
2177
}
1778
2178
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
if(ret >= 1){
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1793
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1806
exitcode = EXIT_FAILURE;
1807
goto end;
1808
}
1809
}
1810
1811
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1812
2180
from the signal handler */
1813
2181
/* Initialize the pseudo-RNG for Avahi */
1814
2182
srand((unsigned int) time(NULL));
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
1817
2185
fprintf_plus(stderr,
1818
2186
"Avahi: Failed to create simple poll object.\n");
1819
2187
exitcode = EX_UNAVAILABLE;
1883
2251
}
1884
2252
}
1885
2253
1886
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
if(if_index == 0){
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1892
goto end;
1893
}
1894
1895
if(quit_now){
1896
goto end;
1897
}
1898
1899
/* Re-raise priviliges */
1900
errno = 0;
1901
ret = seteuid(0);
1902
if(ret == -1){
1903
perror_plus("seteuid");
1904
}
1905
1906
#ifdef __linux__
1907
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
1909
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1911
if(ret == -1){
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
1914
}
1915
#endif /* __linux__ */
1916
1917
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
if(sd < 0){
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1924
if(ret == -1){
1925
perror_plus("klogctl");
1926
}
1927
}
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1930
errno = 0;
1931
ret = seteuid(uid);
1932
if(ret == -1){
1933
perror_plus("seteuid");
1934
}
1935
goto end;
1936
}
1937
strcpy(network.ifr_name, interface);
1938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
1941
#ifdef __linux__
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1944
if(ret == -1){
1945
perror_plus("klogctl");
1946
}
1947
}
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1951
errno = 0;
1952
ret = seteuid(uid);
1953
if(ret == -1){
1954
perror_plus("seteuid");
1955
}
1956
goto end;
1957
}
1958
if((network.ifr_flags & IFF_UP) == 0){
1959
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
if(ret == -1){
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
1966
#ifdef __linux__
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1969
if(ret == -1){
1970
perror_plus("klogctl");
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
1971
2303
}
1972
2304
}
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1975
errno = 0;
1976
ret = seteuid(uid);
1977
if(ret == -1){
1978
perror_plus("seteuid");
1979
}
1980
goto end;
1981
}
1982
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1985
for(int i=0; i < delay * 4; i++){
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1989
} else if(network.ifr_flags & IFF_RUNNING){
1990
2305
break;
1991
2306
}
1992
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
ret = nanosleep(&sleeptime, NULL);
1994
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1996
}
1997
}
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
if(ret == -1){
2002
perror_plus("close");
2003
}
2004
}
2005
#ifdef __linux__
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2009
if(ret == -1){
2010
perror_plus("klogctl");
2011
}
2012
}
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2015
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
2020
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2021
2334
}
2022
2335
2023
2336
if(quit_now){
2024
2337
goto end;
2025
2338
}
2026
2339
2027
ret = init_gnutls_global(pubkey, seckey);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
2341
if(ret == -1){
2029
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2030
2343
exitcode = EX_UNAVAILABLE;
2037
2350
goto end;
2038
2351
}
2039
2352
2040
if(mkdtemp(tempdir) == NULL){
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2041
2363
perror_plus("mkdtemp");
2042
2364
goto end;
2043
2365
}
2044
tempdir_created = true;
2045
2366
2046
2367
if(quit_now){
2047
2368
goto end;
2048
2369
}
2049
2370
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2052
2373
exitcode = EX_UNAVAILABLE;
2053
2374
goto end;
2063
2384
/* Connect directly, do not use Zeroconf */
2064
2385
/* (Mainly meant for debugging) */
2065
2386
char *address = strrchr(connect_to, ':');
2387
2066
2388
if(address == NULL){
2067
2389
fprintf_plus(stderr, "No colon in address\n");
2068
2390
exitcode = EX_USAGE;
2073
2395
goto end;
2074
2396
}
2075
2397
2076
uint16_t port;
2398
in_port_t port;
2077
2399
errno = 0;
2078
2400
tmpmax = strtoimax(address+1, &tmp, 10);
2079
2401
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
or tmpmax != (uint16_t)tmpmax){
2402
or tmpmax != (in_port_t)tmpmax){
2081
2403
fprintf_plus(stderr, "Bad port number\n");
2082
2404
exitcode = EX_USAGE;
2083
2405
goto end;
2084
2406
}
2085
2407
2086
2408
if(quit_now){
2087
2409
goto end;
2088
2410
}
2089
2411
2090
port = (uint16_t)tmpmax;
2412
port = (in_port_t)tmpmax;
2091
2413
*address = '\0';
2092
2414
/* Colon in address indicates IPv6 */
2093
2415
int af;
2109
2431
}
2110
2432
2111
2433
while(not quit_now){
2112
ret = start_mandos_communication(address, port, if_index, af);
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2113
2436
if(quit_now or ret == 0){
2114
2437
break;
2115
2438
}
2117
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
2441
(int)retry_interval);
2119
2442
}
2120
sleep((int)retry_interval);
2443
sleep((unsigned int)retry_interval);
2121
2444
}
2122
2445
2123
if (not quit_now){
2446
if(not quit_now){
2124
2447
exitcode = EXIT_SUCCESS;
2125
2448
}
2126
2449
2141
2464
config.publish_domain = 0;
2142
2465
2143
2466
/* Allocate a new server */
2144
mc.server = avahi_server_new(avahi_simple_poll_get
2145
(mc.simple_poll), &config, NULL,
2146
NULL, &error);
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2147
2469
2148
2470
/* Free the Avahi configuration data */
2149
2471
avahi_server_config_free(&config);
2152
2474
/* Check if creating the Avahi server object succeeded */
2153
2475
if(mc.server == NULL){
2154
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
2477
avahi_strerror(ret_errno));
2156
2478
exitcode = EX_UNAVAILABLE;
2157
2479
goto end;
2158
2480
}
2164
2486
/* Create the Avahi service browser */
2165
2487
sb = avahi_s_service_browser_new(mc.server, if_index,
2166
2488
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2167
NULL, 0, browse_callback, NULL);
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2168
2491
if(sb == NULL){
2169
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
2493
avahi_strerror(avahi_server_errno(mc.server)));
2181
2504
if(debug){
2182
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
2183
2506
}
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2187
2510
if(debug){
2188
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
2512
(ret == 0) ? "successfully" : "with error");
2196
2519
}
2197
2520
2198
2521
/* Cleanup things */
2522
free(mc.interfaces);
2523
2199
2524
if(sb != NULL)
2200
2525
avahi_s_service_browser_free(sb);
2201
2526
2202
2527
if(mc.server != NULL)
2203
2528
avahi_server_free(mc.server);
2204
2529
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2207
2532
2208
2533
if(gnutls_initialized){
2209
2534
gnutls_certificate_free_credentials(mc.cred);
2226
2551
}
2227
2552
}
2228
2553
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2554
/* Re-raise privileges */
2233
2555
{
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2238
2583
}
2239
2584
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
}
2251
}
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
if(ret == -1){
2254
perror_plus("close");
2255
}
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2256
2589
}
2257
2590
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2591
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2264
2594
2265
2595
/* Removes the GPGME temp directory and all files inside */
2266
if(tempdir_created){
2596
if(tempdir != NULL){
2267
2597
struct dirent **direntries = NULL;
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
2274
char *fullname = NULL;
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
direntry->d_name);
2277
if(ret < 0){
2278
perror_plus("asprintf");
2279
continue;
2280
}
2281
ret = remove(fullname);
2282
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
2285
}
2286
free(fullname);
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2287
2634
}
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
2294
}
2295
ret = rmdir(tempdir);
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2298
2636
}
2299
2637
}
2300
2638
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0