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- Committer: Teddy Hogeborn
- Date: 2011-11-24 21:29:56 UTC
- mto: (505.2.9 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124212956-cvsltm0m2e1wi9on
* plugins.d/mandos-client.c (runnable_hook): Add debug output.
(run_network_hooks): Bug fix: Ignore quit_now. Also add debug output.
(main): Bug fix: Ignore return value from run_network_hooks when
passing "stop".
(run_network_hooks): Bug fix: Ignore quit_now. Also add debug output.
(main): Bug fix: Ignore return value from run_network_hooks when
passing "stop".
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
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() */
94
90
95
91
#ifdef __linux__
96
92
#include <sys/klog.h> /* klogctl() */
138
134
static const char sys_class_net[] = "/sys/class/net";
139
135
char *connect_to = NULL;
140
136
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
137
144
138
/* Doubly linked list that need to be circularly linked when used */
145
139
typedef struct server{
146
140
const char *ip;
147
in_port_t port;
141
uint16_t port;
148
142
AvahiIfIndex if_index;
149
143
int af;
150
144
struct timespec last_seen;
154
148
155
149
/* Used for passing in values through the Avahi callback functions */
156
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
157
152
AvahiServer *server;
158
153
gnutls_certificate_credentials_t cred;
159
154
unsigned int dh_bits;
161
156
const char *priority;
162
157
gpgme_ctx_t ctx;
163
158
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
159
} mandos_context;
167
160
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
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 };
170
166
171
167
sig_atomic_t quit_now = 0;
172
168
int signal_received = 0;
173
169
174
170
/* Function to use when printing errors */
175
171
void perror_plus(const char *print_text){
176
int e = errno;
177
172
fprintf(stderr, "Mandos plugin %s: ",
178
173
program_invocation_short_name);
179
errno = e;
180
174
perror(print_text);
181
175
}
182
176
183
__attribute__((format (gnu_printf, 2, 3)))
184
177
int fprintf_plus(FILE *stream, const char *format, ...){
185
178
va_list ap;
186
179
va_start (ap, format);
187
180
188
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
182
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
184
}
192
185
193
186
/*
198
191
size_t incbuffer(char **buffer, size_t buffer_length,
199
192
size_t buffer_capacity){
200
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
207
196
return 0;
208
197
}
209
*buffer = new_buf;
210
198
buffer_capacity += BUFFER_SIZE;
211
199
}
212
200
return buffer_capacity;
213
201
}
214
202
215
203
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
218
206
int ret;
219
207
server *new_server = malloc(sizeof(server));
220
208
if(new_server == NULL){
221
209
perror_plus("malloc");
222
return false;
210
return -1;
223
211
}
224
212
*new_server = (server){ .ip = strdup(ip),
225
213
.port = port,
227
215
.af = af };
228
216
if(new_server->ip == NULL){
229
217
perror_plus("strdup");
230
return false;
218
return -1;
231
219
}
232
220
/* Special case of first server */
233
if(*current_server == NULL){
221
if (mc.current_server == NULL){
234
222
new_server->next = new_server;
235
223
new_server->prev = new_server;
236
*current_server = new_server;
224
mc.current_server = new_server;
237
225
/* Place the new server last in the list */
238
226
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
241
229
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
230
mc.current_server->prev = new_server;
243
231
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
245
233
if(ret == -1){
246
234
perror_plus("clock_gettime");
247
return false;
235
return -1;
248
236
}
249
return true;
237
return 0;
250
238
}
251
239
252
240
/*
253
241
* Initialize GPGME.
254
242
*/
255
243
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
244
const char *tempdir){
257
245
gpgme_error_t rc;
258
246
gpgme_engine_info_t engine_info;
259
247
248
260
249
/*
261
250
* Helper function to insert pub and seckey to the engine keyring.
262
251
*/
278
267
return false;
279
268
}
280
269
281
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
282
271
if(rc != GPG_ERR_NO_ERROR){
283
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
273
gpgme_strsource(rc), gpgme_strerror(rc));
328
317
}
329
318
330
319
/* Create new GPGME "context" */
331
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
332
321
if(rc != GPG_ERR_NO_ERROR){
333
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
349
338
*/
350
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
340
size_t crypto_size,
352
char **plaintext,
353
mandos_context *mc){
341
char **plaintext){
354
342
gpgme_data_t dh_crypto, dh_plain;
355
343
gpgme_error_t rc;
356
344
ssize_t ret;
382
370
383
371
/* Decrypt data from the cryptotext data buffer to the plaintext
384
372
data buffer */
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
386
374
if(rc != GPG_ERR_NO_ERROR){
387
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
376
gpgme_strsource(rc), gpgme_strerror(rc));
389
377
plaintext_length = -1;
390
378
if(debug){
391
379
gpgme_decrypt_result_t result;
392
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
393
381
if(result == NULL){
394
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
395
383
} else {
473
461
}
474
462
475
463
static const char * safer_gnutls_strerror(int value){
476
const char *ret = gnutls_strerror(value);
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
477
466
if(ret == NULL)
478
467
ret = "(unknown)";
479
468
return ret;
486
475
}
487
476
488
477
static int init_gnutls_global(const char *pubkeyfilename,
489
const char *seckeyfilename,
490
mandos_context *mc){
478
const char *seckeyfilename){
491
479
int ret;
492
480
493
481
if(debug){
510
498
}
511
499
512
500
/* OpenPGP credentials */
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
514
502
if(ret != GNUTLS_E_SUCCESS){
515
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
504
safer_gnutls_strerror(ret));
526
514
}
527
515
528
516
ret = gnutls_certificate_set_openpgp_key_file
529
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
530
518
GNUTLS_OPENPGP_FMT_BASE64);
531
519
if(ret != GNUTLS_E_SUCCESS){
532
520
fprintf_plus(stderr,
538
526
}
539
527
540
528
/* GnuTLS server initialization */
541
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
542
530
if(ret != GNUTLS_E_SUCCESS){
543
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
532
" initialization: %s\n",
545
533
safer_gnutls_strerror(ret));
546
534
goto globalfail;
547
535
}
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
549
537
if(ret != GNUTLS_E_SUCCESS){
550
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
539
safer_gnutls_strerror(ret));
552
540
goto globalfail;
553
541
}
554
542
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
544
557
545
return 0;
558
546
559
547
globalfail:
560
548
561
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
562
550
gnutls_global_deinit();
563
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
564
552
return -1;
565
553
}
566
554
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
569
556
int ret;
570
557
/* GnuTLS session creation */
571
558
do {
583
570
{
584
571
const char *err;
585
572
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
574
if(quit_now){
588
575
gnutls_deinit(*session);
589
576
return -1;
600
587
601
588
do {
602
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
590
mc.cred);
604
591
if(quit_now){
605
592
gnutls_deinit(*session);
606
593
return -1;
616
603
/* ignore client certificate if any. */
617
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
605
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
607
621
608
return 0;
622
609
}
626
613
__attribute__((unused)) const char *txt){}
627
614
628
615
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
630
617
AvahiIfIndex if_index,
631
int af, mandos_context *mc){
618
int af){
632
619
int ret, tcp_sd = -1;
633
620
ssize_t sret;
634
621
union {
664
651
return -1;
665
652
}
666
653
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);
654
ret = init_gnutls_session(&session);
700
655
if(ret != 0){
701
656
return -1;
702
657
}
703
658
704
659
if(debug){
705
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
707
662
}
708
663
709
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
740
695
goto mandos_end;
741
696
}
742
697
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
748
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
753
705
if(if_index == AVAHI_IF_UNSPEC){
754
706
fprintf_plus(stderr, "An IPv6 link-local address is"
755
707
" incomplete without a network interface\n");
760
712
to.in6.sin6_scope_id = (uint32_t)if_index;
761
713
}
762
714
} else {
763
to.in.sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
764
718
}
765
719
766
720
if(quit_now){
774
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
775
729
perror_plus("if_indextoname");
776
730
} else {
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
779
733
}
780
734
} else {
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
783
737
}
784
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
863
817
goto mandos_end;
864
818
}
865
819
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);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
871
822
872
823
if(quit_now){
873
824
errno = EINTR;
978
929
if(buffer_length > 0){
979
930
ssize_t decrypted_buffer_size;
980
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
932
&decrypted_buffer);
982
933
if(decrypted_buffer_size >= 0){
983
934
984
935
written = 0;
1045
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
998
flags,
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1052
1001
1053
1002
/* Called whenever a service has been resolved successfully or
1054
1003
timed out */
1063
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
1014
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1068
1016
break;
1069
1017
1070
1018
case AVAHI_RESOLVER_FOUND:
1076
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
1025
host_name, ip, (intmax_t)interface, port);
1078
1026
}
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1083
1029
if(ret == 0){
1084
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1085
1031
} else {
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
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1092
1034
}
1093
1035
}
1094
1036
}
1104
1046
const char *domain,
1105
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1048
flags,
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1111
1051
1112
1052
/* Called whenever a new services becomes available on the LAN or
1113
1053
is removed from the LAN */
1121
1061
case AVAHI_BROWSER_FAILURE:
1122
1062
1123
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1127
1066
return;
1128
1067
1129
1068
case AVAHI_BROWSER_NEW:
1132
1071
the callback function is called the Avahi server will free the
1133
1072
resolver for us. */
1134
1073
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)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1139
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
1078
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1143
1080
break;
1144
1081
1145
1082
case AVAHI_BROWSER_REMOVE:
1164
1101
signal_received = sig;
1165
1102
int old_errno = errno;
1166
1103
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1169
1106
}
1170
1107
errno = old_errno;
1171
1108
}
1172
1109
1173
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
1111
int ret;
1175
error_t ret_errno;
1176
1112
1177
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
1114
if(s < 0){
1179
ret_errno = errno;
1180
1115
perror_plus("socket");
1181
errno = ret_errno;
1182
1116
return false;
1183
1117
}
1184
1118
strcpy(ifr->ifr_name, ifname);
1185
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
1120
if(ret == -1){
1187
1121
if(debug){
1188
ret_errno = errno;
1189
1122
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
1123
}
1192
1124
return false;
1193
1125
}
1262
1194
}
1263
1195
1264
1196
/*
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);
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;
1294
1237
}
1295
1238
1296
1239
int notdotentries(const struct dirent *direntry){
1365
1308
return 1;
1366
1309
}
1367
1310
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1370
1312
int ret;
1371
1313
struct timespec now;
1372
1314
struct timespec waited_time;
1373
1315
intmax_t block_time;
1374
1316
1375
1317
while(true){
1376
if(mc->current_server == NULL){
1318
if(mc.current_server == NULL){
1377
1319
if (debug){
1378
1320
fprintf_plus(stderr, "Wait until first server is found."
1379
1321
" No timeout!\n");
1393
1335
/* Calculating in ms how long time between now and server
1394
1336
who we visted longest time ago. Now - last seen. */
1395
1337
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1338
- mc.current_server->last_seen.tv_sec);
1397
1339
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1340
- mc.current_server->last_seen.tv_nsec);
1399
1341
/* total time is 10s/10,000ms.
1400
1342
Converting to s from ms by dividing by 1,000,
1401
1343
and ns to ms by dividing by 1,000,000. */
1409
1351
}
1410
1352
1411
1353
if(block_time <= 0){
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
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1416
1358
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1359
avahi_simple_poll_quit(mc.simple_poll);
1418
1360
return 0;
1419
1361
}
1420
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1363
&mc.current_server->last_seen);
1422
1364
if(ret == -1){
1423
1365
perror_plus("clock_gettime");
1424
1366
return -1;
1425
1367
}
1426
mc->current_server = mc->current_server->next;
1368
mc.current_server = mc.current_server->next;
1427
1369
block_time = 0; /* Call avahi to find new Mandos
1428
1370
servers, but don't block */
1429
1371
}
1438
1380
}
1439
1381
}
1440
1382
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
1493
1383
bool run_network_hooks(const char *mode, const char *interface,
1494
1384
const float delay){
1495
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1496
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
1389
alphasort);
1498
1390
if(numhooks == -1){
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
}
1391
perror_plus("scandir");
1507
1392
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
1393
int devnull = open("/dev/null", O_RDONLY);
1511
1394
for(int i = 0; i < numhooks; i++){
1512
1395
direntry = direntries[i];
1523
1406
pid_t hook_pid = fork();
1524
1407
if(hook_pid == 0){
1525
1408
/* 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
}
1540
1409
dup2(devnull, STDIN_FILENO);
1541
1410
close(devnull);
1542
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
1413
if(ret == -1){
1545
1414
perror_plus("setenv");
1546
_exit(EX_OSERR);
1415
return false;
1547
1416
}
1548
1417
ret = setenv("DEVICE", interface, 1);
1549
1418
if(ret == -1){
1550
1419
perror_plus("setenv");
1551
_exit(EX_OSERR);
1420
return false;
1552
1421
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1554
1423
if(ret == -1){
1555
1424
perror_plus("setenv");
1556
_exit(EX_OSERR);
1425
return false;
1557
1426
}
1558
1427
ret = setenv("MODE", mode, 1);
1559
1428
if(ret == -1){
1560
1429
perror_plus("setenv");
1561
_exit(EX_OSERR);
1430
return false;
1562
1431
}
1563
1432
char *delaystring;
1564
1433
ret = asprintf(&delaystring, "%f", delay);
1565
1434
if(ret == -1){
1566
1435
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1436
return false;
1568
1437
}
1569
1438
ret = setenv("DELAY", delaystring, 1);
1570
1439
if(ret == -1){
1571
1440
free(delaystring);
1572
1441
perror_plus("setenv");
1573
_exit(EX_OSERR);
1442
return false;
1574
1443
}
1575
1444
free(delaystring);
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
}
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1587
1447
} else {
1588
1448
int status;
1589
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1623
1483
return true;
1624
1484
}
1625
1485
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
1796
1486
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 };
1801
1487
AvahiSServiceBrowser *sb = NULL;
1802
error_t ret_errno;
1488
int error;
1803
1489
int ret;
1804
1490
intmax_t tmpmax;
1805
1491
char *tmp;
1806
1492
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1809
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1810
1500
bool tempdir_created = false;
1811
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1502
const char *seckey = PATHDIR "/" SECKEY;
1813
1503
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1815
1504
1816
1505
bool gnutls_initialized = false;
1817
1506
bool gpgme_initialized = false;
1879
1568
.group = 2 },
1880
1569
{ .name = "retry", .key = 132,
1881
1570
.arg = "SECONDS",
1882
.doc = "Retry interval used when denied by the Mandos server",
1571
.doc = "Retry interval used when denied by the mandos server",
1883
1572
.group = 2 },
1884
1573
{ .name = "network-hook-dir", .key = 133,
1885
1574
.arg = "DIR",
1908
1597
connect_to = arg;
1909
1598
break;
1910
1599
case 'i': /* --interface */
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
}
1600
interface = arg;
1916
1601
break;
1917
1602
case 's': /* --seckey */
1918
1603
seckey = arg;
1961
1646
argp_state_help(state, state->out_stream,
1962
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1963
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1964
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1965
1652
exit(argp_err_exit_status);
1966
1653
break;
1991
1678
}
1992
1679
}
1993
1680
1994
{
1681
if(getuid() == 0){
1995
1682
/* Work around Debian bug #633582:
1996
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1997
1685
1998
1686
/* Re-raise priviliges */
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
}
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
2063
1740
}
2064
1741
}
2065
1742
2066
1743
/* Run network hooks */
2067
1744
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
2073
1751
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
1752
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1753
if(not run_network_hooks("start", interface, delay)){
2079
1754
goto end;
2080
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
2081
1764
}
2082
1765
2083
1766
if(not debug){
2084
1767
avahi_set_log_function(empty_log);
2085
1768
}
2086
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
2087
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1803
from the signal handler */
2089
1804
/* Initialize the pseudo-RNG for Avahi */
2090
1805
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2093
1808
fprintf_plus(stderr,
2094
1809
"Avahi: Failed to create simple poll object.\n");
2095
1810
exitcode = EX_UNAVAILABLE;
2159
1874
}
2160
1875
}
2161
1876
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;
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2209
1962
}
2210
1963
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
2211
1981
break;
2212
1982
}
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);
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2242
2012
}
2243
2013
2244
2014
if(quit_now){
2245
2015
goto end;
2246
2016
}
2247
2017
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2018
ret = init_gnutls_global(pubkey, seckey);
2249
2019
if(ret == -1){
2250
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
2021
exitcode = EX_UNAVAILABLE;
2268
2038
goto end;
2269
2039
}
2270
2040
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2272
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2273
2043
exitcode = EX_UNAVAILABLE;
2274
2044
goto end;
2284
2054
/* Connect directly, do not use Zeroconf */
2285
2055
/* (Mainly meant for debugging) */
2286
2056
char *address = strrchr(connect_to, ':');
2287
2288
2057
if(address == NULL){
2289
2058
fprintf_plus(stderr, "No colon in address\n");
2290
2059
exitcode = EX_USAGE;
2295
2064
goto end;
2296
2065
}
2297
2066
2298
in_port_t port;
2067
uint16_t port;
2299
2068
errno = 0;
2300
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2301
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2302
or tmpmax != (in_port_t)tmpmax){
2071
or tmpmax != (uint16_t)tmpmax){
2303
2072
fprintf_plus(stderr, "Bad port number\n");
2304
2073
exitcode = EX_USAGE;
2305
2074
goto end;
2306
2075
}
2307
2076
2308
2077
if(quit_now){
2309
2078
goto end;
2310
2079
}
2311
2080
2312
port = (in_port_t)tmpmax;
2081
port = (uint16_t)tmpmax;
2313
2082
*address = '\0';
2314
2083
/* Colon in address indicates IPv6 */
2315
2084
int af;
2331
2100
}
2332
2101
2333
2102
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2103
ret = start_mandos_communication(address, port, if_index, af);
2336
2104
if(quit_now or ret == 0){
2337
2105
break;
2338
2106
}
2340
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
2109
(int)retry_interval);
2342
2110
}
2343
sleep((unsigned int)retry_interval);
2111
sleep((int)retry_interval);
2344
2112
}
2345
2113
2346
2114
if (not quit_now){
2364
2132
config.publish_domain = 0;
2365
2133
2366
2134
/* Allocate a new server */
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
2369
2138
2370
2139
/* Free the Avahi configuration data */
2371
2140
avahi_server_config_free(&config);
2374
2143
/* Check if creating the Avahi server object succeeded */
2375
2144
if(mc.server == NULL){
2376
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2146
avahi_strerror(error));
2378
2147
exitcode = EX_UNAVAILABLE;
2379
2148
goto end;
2380
2149
}
2386
2155
/* Create the Avahi service browser */
2387
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
2388
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
2158
NULL, 0, browse_callback, NULL);
2391
2159
if(sb == NULL){
2392
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
2161
avahi_strerror(avahi_server_errno(mc.server)));
2405
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
2174
}
2407
2175
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2410
2178
if(debug){
2411
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
2180
(ret == 0) ? "successfully" : "with error");
2419
2187
}
2420
2188
2421
2189
/* Cleanup things */
2422
free(mc.interfaces);
2423
2424
2190
if(sb != NULL)
2425
2191
avahi_s_service_browser_free(sb);
2426
2192
2427
2193
if(mc.server != NULL)
2428
2194
avahi_server_free(mc.server);
2429
2195
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2432
2198
2433
2199
if(gnutls_initialized){
2434
2200
gnutls_certificate_free_credentials(mc.cred);
2453
2219
2454
2220
/* Re-raise priviliges */
2455
2221
{
2456
raise_privileges();
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2457
2229
2458
2230
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2231
run_network_hooks("stop", interface, delay);
2461
2232
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");
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2472
2243
}
2473
2244
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2477
2248
}
2478
2249
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2485
2259
2486
2260
/* Removes the GPGME temp directory and all files inside */
2487
2261
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0