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- Committer: Teddy Hogeborn
- Date: 2014-03-06 02:26:04 UTC
- Revision ID: teddy@recompile.se-20140306022604-4uc43taz25cflgi3
Bug fix: Free all memory and give better messages when memory is full.
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
- files added:
- debian/mandos-client.examples
- network-hooks.d
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
90
94
91
95
#ifdef __linux__
92
96
#include <sys/klog.h> /* klogctl() */
134
138
static const char sys_class_net[] = "/sys/class/net";
135
139
char *connect_to = NULL;
136
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
137
143
138
144
/* Doubly linked list that need to be circularly linked when used */
139
145
typedef struct server{
140
146
const char *ip;
141
uint16_t port;
147
in_port_t port;
142
148
AvahiIfIndex if_index;
143
149
int af;
144
150
struct timespec last_seen;
148
154
149
155
/* Used for passing in values through the Avahi callback functions */
150
156
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
157
AvahiServer *server;
153
158
gnutls_certificate_credentials_t cred;
154
159
unsigned int dh_bits;
156
161
const char *priority;
157
162
gpgme_ctx_t ctx;
158
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
159
166
} mandos_context;
160
167
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
166
170
167
171
sig_atomic_t quit_now = 0;
168
172
int signal_received = 0;
169
173
170
174
/* Function to use when printing errors */
171
175
void perror_plus(const char *print_text){
176
int e = errno;
172
177
fprintf(stderr, "Mandos plugin %s: ",
173
178
program_invocation_short_name);
179
errno = e;
174
180
perror(print_text);
175
181
}
176
182
183
__attribute__((format (gnu_printf, 2, 3)))
177
184
int fprintf_plus(FILE *stream, const char *format, ...){
178
185
va_list ap;
179
186
va_start (ap, format);
180
187
181
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
189
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
191
}
185
192
186
193
/*
191
198
size_t incbuffer(char **buffer, size_t buffer_length,
192
199
size_t buffer_capacity){
193
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
196
207
return 0;
197
208
}
209
*buffer = new_buf;
198
210
buffer_capacity += BUFFER_SIZE;
199
211
}
200
212
return buffer_capacity;
201
213
}
202
214
203
215
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
206
218
int ret;
207
219
server *new_server = malloc(sizeof(server));
208
220
if(new_server == NULL){
209
221
perror_plus("malloc");
210
return -1;
222
return false;
211
223
}
212
224
*new_server = (server){ .ip = strdup(ip),
213
225
.port = port,
215
227
.af = af };
216
228
if(new_server->ip == NULL){
217
229
perror_plus("strdup");
218
return -1;
230
return false;
219
231
}
220
232
/* Special case of first server */
221
if (mc.current_server == NULL){
233
if(*current_server == NULL){
222
234
new_server->next = new_server;
223
235
new_server->prev = new_server;
224
mc.current_server = new_server;
236
*current_server = new_server;
225
237
/* Place the new server last in the list */
226
238
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
229
241
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
242
(*current_server)->prev = new_server;
231
243
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
233
245
if(ret == -1){
234
246
perror_plus("clock_gettime");
235
return -1;
247
return false;
236
248
}
237
return 0;
249
return true;
238
250
}
239
251
240
252
/*
241
253
* Initialize GPGME.
242
254
*/
243
255
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
256
const char *tempdir, mandos_context *mc){
245
257
gpgme_error_t rc;
246
258
gpgme_engine_info_t engine_info;
247
259
248
249
260
/*
250
261
* Helper function to insert pub and seckey to the engine keyring.
251
262
*/
267
278
return false;
268
279
}
269
280
270
rc = gpgme_op_import(mc.ctx, pgp_data);
281
rc = gpgme_op_import(mc->ctx, pgp_data);
271
282
if(rc != GPG_ERR_NO_ERROR){
272
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
284
gpgme_strsource(rc), gpgme_strerror(rc));
317
328
}
318
329
319
330
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
331
rc = gpgme_new(&(mc->ctx));
321
332
if(rc != GPG_ERR_NO_ERROR){
322
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
349
*/
339
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
351
size_t crypto_size,
341
char **plaintext){
352
char **plaintext,
353
mandos_context *mc){
342
354
gpgme_data_t dh_crypto, dh_plain;
343
355
gpgme_error_t rc;
344
356
ssize_t ret;
370
382
371
383
/* Decrypt data from the cryptotext data buffer to the plaintext
372
384
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
386
if(rc != GPG_ERR_NO_ERROR){
375
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
388
gpgme_strsource(rc), gpgme_strerror(rc));
377
389
plaintext_length = -1;
378
390
if(debug){
379
391
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
381
393
if(result == NULL){
382
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
395
} else {
461
473
}
462
474
463
475
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
476
const char *ret = gnutls_strerror(value);
466
477
if(ret == NULL)
467
478
ret = "(unknown)";
468
479
return ret;
475
486
}
476
487
477
488
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
489
const char *seckeyfilename,
490
mandos_context *mc){
479
491
int ret;
480
492
481
493
if(debug){
498
510
}
499
511
500
512
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
514
if(ret != GNUTLS_E_SUCCESS){
503
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
516
safer_gnutls_strerror(ret));
514
526
}
515
527
516
528
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
518
530
GNUTLS_OPENPGP_FMT_BASE64);
519
531
if(ret != GNUTLS_E_SUCCESS){
520
532
fprintf_plus(stderr,
526
538
}
527
539
528
540
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
530
542
if(ret != GNUTLS_E_SUCCESS){
531
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
544
" initialization: %s\n",
533
545
safer_gnutls_strerror(ret));
534
546
goto globalfail;
535
547
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
549
if(ret != GNUTLS_E_SUCCESS){
538
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
551
safer_gnutls_strerror(ret));
540
552
goto globalfail;
541
553
}
542
554
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
556
545
557
return 0;
546
558
547
559
globalfail:
548
560
549
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
550
562
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
552
564
return -1;
553
565
}
554
566
555
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
556
569
int ret;
557
570
/* GnuTLS session creation */
558
571
do {
570
583
{
571
584
const char *err;
572
585
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
587
if(quit_now){
575
588
gnutls_deinit(*session);
576
589
return -1;
587
600
588
601
do {
589
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
603
mc->cred);
591
604
if(quit_now){
592
605
gnutls_deinit(*session);
593
606
return -1;
603
616
/* ignore client certificate if any. */
604
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
618
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
620
608
621
return 0;
609
622
}
613
626
__attribute__((unused)) const char *txt){}
614
627
615
628
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
617
630
AvahiIfIndex if_index,
618
int af){
631
int af, mandos_context *mc){
619
632
int ret, tcp_sd = -1;
620
633
ssize_t sret;
621
634
union {
651
664
return -1;
652
665
}
653
666
654
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
655
700
if(ret != 0){
656
701
return -1;
657
702
}
658
703
659
704
if(debug){
660
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
706
PRIuMAX "\n", ip, (uintmax_t)port);
662
707
}
663
708
664
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
695
740
goto mandos_end;
696
741
}
697
742
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
702
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
705
753
if(if_index == AVAHI_IF_UNSPEC){
706
754
fprintf_plus(stderr, "An IPv6 link-local address is"
707
755
" incomplete without a network interface\n");
712
760
to.in6.sin6_scope_id = (uint32_t)if_index;
713
761
}
714
762
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
763
to.in.sin_port = htons(port);
718
764
}
719
765
720
766
if(quit_now){
728
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
775
perror_plus("if_indextoname");
730
776
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
733
779
}
734
780
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
737
783
}
738
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
817
863
goto mandos_end;
818
864
}
819
865
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
871
823
872
if(quit_now){
824
873
errno = EINTR;
929
978
if(buffer_length > 0){
930
979
ssize_t decrypted_buffer_size;
931
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
981
&decrypted_buffer, mc);
933
982
if(decrypted_buffer_size >= 0){
934
983
935
984
written = 0;
996
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1047
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
1001
1052
1002
1053
/* Called whenever a service has been resolved successfully or
1003
1054
timed out */
1012
1063
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1064
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1065
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
1016
1068
break;
1017
1069
1018
1070
case AVAHI_RESOLVER_FOUND:
1024
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1077
host_name, ip, (intmax_t)interface, port);
1026
1078
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1029
1083
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1031
1085
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
1034
1092
}
1035
1093
}
1036
1094
}
1046
1104
const char *domain,
1047
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1106
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1051
1111
1052
1112
/* Called whenever a new services becomes available on the LAN or
1053
1113
is removed from the LAN */
1061
1121
case AVAHI_BROWSER_FAILURE:
1062
1122
1063
1123
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1066
1127
return;
1067
1128
1068
1129
case AVAHI_BROWSER_NEW:
1071
1132
the callback function is called the Avahi server will free the
1072
1133
resolver for us. */
1073
1134
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1077
1139
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1140
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
1080
1143
break;
1081
1144
1082
1145
case AVAHI_BROWSER_REMOVE:
1101
1164
signal_received = sig;
1102
1165
int old_errno = errno;
1103
1166
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1106
1169
}
1107
1170
errno = old_errno;
1108
1171
}
1109
1172
1110
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1174
int ret;
1175
error_t ret_errno;
1112
1176
1113
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1178
if(s < 0){
1179
ret_errno = errno;
1115
1180
perror_plus("socket");
1181
errno = ret_errno;
1116
1182
return false;
1117
1183
}
1118
1184
strcpy(ifr->ifr_name, ifname);
1119
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1186
if(ret == -1){
1121
1187
if(debug){
1188
ret_errno = errno;
1122
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1123
1191
}
1124
1192
return false;
1125
1193
}
1194
1262
}
1195
1263
1196
1264
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(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_RUNNING);
1237
1294
}
1238
1295
1239
1296
int notdotentries(const struct dirent *direntry){
1301
1358
}
1302
1359
return 0;
1303
1360
}
1361
if(debug){
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
direntry->d_name);
1364
}
1304
1365
return 1;
1305
1366
}
1306
1367
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1308
1370
int ret;
1309
1371
struct timespec now;
1310
1372
struct timespec waited_time;
1311
1373
intmax_t block_time;
1312
1374
1313
1375
while(true){
1314
if(mc.current_server == NULL){
1376
if(mc->current_server == NULL){
1315
1377
if (debug){
1316
1378
fprintf_plus(stderr, "Wait until first server is found."
1317
1379
" No timeout!\n");
1331
1393
/* Calculating in ms how long time between now and server
1332
1394
who we visted longest time ago. Now - last seen. */
1333
1395
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1396
- mc->current_server->last_seen.tv_sec);
1335
1397
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1398
- mc->current_server->last_seen.tv_nsec);
1337
1399
/* total time is 10s/10,000ms.
1338
1400
Converting to s from ms by dividing by 1,000,
1339
1401
and ns to ms by dividing by 1,000,000. */
1347
1409
}
1348
1410
1349
1411
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1354
1416
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1417
avahi_simple_poll_quit(s);
1356
1418
return 0;
1357
1419
}
1358
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1421
&mc->current_server->last_seen);
1360
1422
if(ret == -1){
1361
1423
perror_plus("clock_gettime");
1362
1424
return -1;
1363
1425
}
1364
mc.current_server = mc.current_server->next;
1426
mc->current_server = mc->current_server->next;
1365
1427
block_time = 0; /* Call avahi to find new Mandos
1366
1428
servers, but don't block */
1367
1429
}
1376
1438
}
1377
1439
}
1378
1440
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1379
1493
bool run_network_hooks(const char *mode, const char *interface,
1380
1494
const float delay){
1381
1495
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
1497
alphasort);
1386
1498
if(numhooks == -1){
1387
perror_plus("scandir");
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1388
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1389
1510
int devnull = open("/dev/null", O_RDONLY);
1390
1511
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1512
direntry = direntries[i];
1392
1513
char *fullname = NULL;
1393
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
1515
if(ret < 0){
1395
1516
perror_plus("asprintf");
1396
1517
continue;
1397
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1398
1523
pid_t hook_pid = fork();
1399
1524
if(hook_pid == 0){
1400
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1401
1540
dup2(devnull, STDIN_FILENO);
1402
1541
close(devnull);
1403
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
1544
if(ret == -1){
1406
1545
perror_plus("setenv");
1407
return false;
1546
_exit(EX_OSERR);
1408
1547
}
1409
1548
ret = setenv("DEVICE", interface, 1);
1410
1549
if(ret == -1){
1411
1550
perror_plus("setenv");
1412
return false;
1551
_exit(EX_OSERR);
1413
1552
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1415
1554
if(ret == -1){
1416
1555
perror_plus("setenv");
1417
return false;
1556
_exit(EX_OSERR);
1418
1557
}
1419
1558
ret = setenv("MODE", mode, 1);
1420
1559
if(ret == -1){
1421
1560
perror_plus("setenv");
1422
return false;
1561
_exit(EX_OSERR);
1423
1562
}
1424
1563
char *delaystring;
1425
1564
ret = asprintf(&delaystring, "%f", delay);
1426
1565
if(ret == -1){
1427
1566
perror_plus("asprintf");
1428
return false;
1567
_exit(EX_OSERR);
1429
1568
}
1430
1569
ret = setenv("DELAY", delaystring, 1);
1431
1570
if(ret == -1){
1432
1571
free(delaystring);
1433
1572
perror_plus("setenv");
1434
return false;
1573
_exit(EX_OSERR);
1435
1574
}
1436
1575
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1439
1587
} else {
1440
1588
int status;
1441
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1465
1613
}
1466
1614
}
1467
1615
free(fullname);
1468
if(quit_now){
1469
break;
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1470
1619
}
1471
1620
}
1472
1621
close(devnull);
1474
1623
return true;
1475
1624
}
1476
1625
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
1477
1796
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1478
1801
AvahiSServiceBrowser *sb = NULL;
1479
int error;
1802
error_t ret_errno;
1480
1803
int ret;
1481
1804
intmax_t tmpmax;
1482
1805
char *tmp;
1483
1806
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1490
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1491
1810
bool tempdir_created = false;
1492
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
1812
const char *seckey = PATHDIR "/" SECKEY;
1494
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1495
1815
1496
1816
bool gnutls_initialized = false;
1497
1817
bool gpgme_initialized = false;
1559
1879
.group = 2 },
1560
1880
{ .name = "retry", .key = 132,
1561
1881
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1882
.doc = "Retry interval used when denied by the Mandos server",
1563
1883
.group = 2 },
1564
1884
{ .name = "network-hook-dir", .key = 133,
1565
1885
.arg = "DIR",
1588
1908
connect_to = arg;
1589
1909
break;
1590
1910
case 'i': /* --interface */
1591
interface = arg;
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1592
1916
break;
1593
1917
case 's': /* --seckey */
1594
1918
seckey = arg;
1637
1961
argp_state_help(state, state->out_stream,
1638
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
1963
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
1965
exit(argp_err_exit_status);
1644
1966
break;
1672
1994
{
1673
1995
/* Work around Debian bug #633582:
1674
1996
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1997
1677
1998
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1999
if(raise_privileges() == 0){
2000
struct stat st;
2001
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2006
} else {
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2008
if(ret == -1){
2009
perror_plus("fstat");
2010
} else {
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2014
if(ret == -1){
2015
perror_plus("fchown");
2016
}
2017
}
2018
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2020
}
2021
}
2022
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2027
} else {
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2029
if(ret == -1){
2030
perror_plus("fstat");
2031
} else {
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2035
if(ret == -1){
2036
perror_plus("fchown");
2037
}
2038
}
2039
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2044
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
2062
}
1731
2063
}
1732
2064
}
1733
2065
1734
2066
/* Run network hooks */
1735
2067
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1741
2076
}
1742
if(not run_network_hooks("start", interface, delay)){
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1743
2079
goto end;
1744
2080
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
1751
2081
}
1752
2082
1753
2083
if(not debug){
1754
2084
avahi_set_log_function(empty_log);
1755
2085
}
1756
2086
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2088
from the signal handler */
1791
2089
/* Initialize the pseudo-RNG for Avahi */
1792
2090
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1795
2093
fprintf_plus(stderr,
1796
2094
"Avahi: Failed to create simple poll object.\n");
1797
2095
exitcode = EX_UNAVAILABLE;
1861
2159
}
1862
2160
}
1863
2161
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
1949
2209
}
1950
2210
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
1968
2211
break;
1969
2212
}
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1999
2242
}
2000
2243
2001
2244
if(quit_now){
2002
2245
goto end;
2003
2246
}
2004
2247
2005
ret = init_gnutls_global(pubkey, seckey);
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2006
2249
if(ret == -1){
2007
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
2251
exitcode = EX_UNAVAILABLE;
2025
2268
goto end;
2026
2269
}
2027
2270
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2029
2272
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2273
exitcode = EX_UNAVAILABLE;
2031
2274
goto end;
2041
2284
/* Connect directly, do not use Zeroconf */
2042
2285
/* (Mainly meant for debugging) */
2043
2286
char *address = strrchr(connect_to, ':');
2287
2044
2288
if(address == NULL){
2045
2289
fprintf_plus(stderr, "No colon in address\n");
2046
2290
exitcode = EX_USAGE;
2051
2295
goto end;
2052
2296
}
2053
2297
2054
uint16_t port;
2298
in_port_t port;
2055
2299
errno = 0;
2056
2300
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2302
or tmpmax != (in_port_t)tmpmax){
2059
2303
fprintf_plus(stderr, "Bad port number\n");
2060
2304
exitcode = EX_USAGE;
2061
2305
goto end;
2062
2306
}
2063
2307
2064
2308
if(quit_now){
2065
2309
goto end;
2066
2310
}
2067
2311
2068
port = (uint16_t)tmpmax;
2312
port = (in_port_t)tmpmax;
2069
2313
*address = '\0';
2070
2314
/* Colon in address indicates IPv6 */
2071
2315
int af;
2087
2331
}
2088
2332
2089
2333
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2091
2336
if(quit_now or ret == 0){
2092
2337
break;
2093
2338
}
2095
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
2341
(int)retry_interval);
2097
2342
}
2098
sleep((int)retry_interval);
2343
sleep((unsigned int)retry_interval);
2099
2344
}
2100
2345
2101
2346
if (not quit_now){
2119
2364
config.publish_domain = 0;
2120
2365
2121
2366
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2125
2369
2126
2370
/* Free the Avahi configuration data */
2127
2371
avahi_server_config_free(&config);
2130
2374
/* Check if creating the Avahi server object succeeded */
2131
2375
if(mc.server == NULL){
2132
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2377
avahi_strerror(ret_errno));
2134
2378
exitcode = EX_UNAVAILABLE;
2135
2379
goto end;
2136
2380
}
2142
2386
/* Create the Avahi service browser */
2143
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2146
2391
if(sb == NULL){
2147
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
2393
avahi_strerror(avahi_server_errno(mc.server)));
2160
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
2406
}
2162
2407
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2165
2410
if(debug){
2166
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
2412
(ret == 0) ? "successfully" : "with error");
2174
2419
}
2175
2420
2176
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
2177
2424
if(sb != NULL)
2178
2425
avahi_s_service_browser_free(sb);
2179
2426
2180
2427
if(mc.server != NULL)
2181
2428
avahi_server_free(mc.server);
2182
2429
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2185
2432
2186
2433
if(gnutls_initialized){
2187
2434
gnutls_certificate_free_credentials(mc.cred);
2192
2439
if(gpgme_initialized){
2193
2440
gpgme_release(mc.ctx);
2194
2441
}
2195
2442
2196
2443
/* Cleans up the circular linked list of Mandos servers the client
2197
2444
has seen */
2198
2445
if(mc.current_server != NULL){
2206
2453
2207
2454
/* Re-raise priviliges */
2208
2455
{
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2456
raise_privileges();
2457
2214
2458
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2218
2461
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2229
2472
}
2230
2473
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2234
2477
}
2235
2478
}
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2243
2485
2244
2486
/* Removes the GPGME temp directory and all files inside */
2245
2487
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0