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- Committer: Teddy Hogeborn
- Date: 2013-10-22 19:24:01 UTC
- Revision ID: teddy@recompile.se-20131022192401-op6mwsb7f7gygjyh
* mandos (priority): Bug fix: Add even more magic to make the old
DSA/ELG 2048-bit keys work with GnuTLS.
* mandos-keygen (KEYCOMMENT): Changed default to "".
* mandos-keygen (OPTIONS): Document new default value of "--comment".
* mandos-options.xml (priority): Document new default value.
* mandos.conf (priority): - '' -
DSA/ELG 2048-bit keys work with GnuTLS.
* mandos-keygen (KEYCOMMENT): Changed default to "".
* mandos-keygen (OPTIONS): Document new default value of "--comment".
* mandos-options.xml (priority): Document new default value.
* mandos.conf (priority): - '' -
- files added:
- 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 © 2008-2011 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() */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
90
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() */
91
94
92
95
#ifdef __linux__
93
96
#include <sys/klog.h> /* klogctl() */
135
138
static const char sys_class_net[] = "/sys/class/net";
136
139
char *connect_to = NULL;
137
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
138
143
139
144
/* Doubly linked list that need to be circularly linked when used */
140
145
typedef struct server{
141
146
const char *ip;
142
uint16_t port;
147
in_port_t port;
143
148
AvahiIfIndex if_index;
144
149
int af;
145
150
struct timespec last_seen;
149
154
150
155
/* Used for passing in values through the Avahi callback functions */
151
156
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
157
AvahiServer *server;
154
158
gnutls_certificate_credentials_t cred;
155
159
unsigned int dh_bits;
157
161
const char *priority;
158
162
gpgme_ctx_t ctx;
159
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
160
166
} mandos_context;
161
167
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
167
170
168
171
sig_atomic_t quit_now = 0;
169
172
int signal_received = 0;
170
173
171
174
/* Function to use when printing errors */
172
175
void perror_plus(const char *print_text){
176
int e = errno;
173
177
fprintf(stderr, "Mandos plugin %s: ",
174
178
program_invocation_short_name);
179
errno = e;
175
180
perror(print_text);
176
181
}
177
182
183
__attribute__((format (gnu_printf, 2, 3)))
178
184
int fprintf_plus(FILE *stream, const char *format, ...){
179
185
va_list ap;
180
186
va_start (ap, format);
181
187
182
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
189
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
191
}
186
192
187
193
/*
202
208
}
203
209
204
210
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
207
213
int ret;
208
214
server *new_server = malloc(sizeof(server));
209
215
if(new_server == NULL){
210
216
perror_plus("malloc");
211
return -1;
217
return false;
212
218
}
213
219
*new_server = (server){ .ip = strdup(ip),
214
220
.port = port,
216
222
.af = af };
217
223
if(new_server->ip == NULL){
218
224
perror_plus("strdup");
219
return -1;
225
return false;
220
226
}
221
227
/* Special case of first server */
222
if (mc.current_server == NULL){
228
if(*current_server == NULL){
223
229
new_server->next = new_server;
224
230
new_server->prev = new_server;
225
mc.current_server = new_server;
231
*current_server = new_server;
226
232
/* Place the new server last in the list */
227
233
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
230
236
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
232
238
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
234
240
if(ret == -1){
235
241
perror_plus("clock_gettime");
236
return -1;
242
return false;
237
243
}
238
return 0;
244
return true;
239
245
}
240
246
241
247
/*
242
248
* Initialize GPGME.
243
249
*/
244
250
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
251
const char *tempdir, mandos_context *mc){
246
252
gpgme_error_t rc;
247
253
gpgme_engine_info_t engine_info;
248
254
249
250
255
/*
251
256
* Helper function to insert pub and seckey to the engine keyring.
252
257
*/
268
273
return false;
269
274
}
270
275
271
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
272
277
if(rc != GPG_ERR_NO_ERROR){
273
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
279
gpgme_strsource(rc), gpgme_strerror(rc));
318
323
}
319
324
320
325
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
322
327
if(rc != GPG_ERR_NO_ERROR){
323
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
339
344
*/
340
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
346
size_t crypto_size,
342
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
343
349
gpgme_data_t dh_crypto, dh_plain;
344
350
gpgme_error_t rc;
345
351
ssize_t ret;
371
377
372
378
/* Decrypt data from the cryptotext data buffer to the plaintext
373
379
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
381
if(rc != GPG_ERR_NO_ERROR){
376
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
383
gpgme_strsource(rc), gpgme_strerror(rc));
378
384
plaintext_length = -1;
379
385
if(debug){
380
386
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
382
388
if(result == NULL){
383
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
390
} else {
462
468
}
463
469
464
470
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
467
472
if(ret == NULL)
468
473
ret = "(unknown)";
469
474
return ret;
476
481
}
477
482
478
483
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
480
486
int ret;
481
487
482
488
if(debug){
499
505
}
500
506
501
507
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
509
if(ret != GNUTLS_E_SUCCESS){
504
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
511
safer_gnutls_strerror(ret));
515
521
}
516
522
517
523
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
519
525
GNUTLS_OPENPGP_FMT_BASE64);
520
526
if(ret != GNUTLS_E_SUCCESS){
521
527
fprintf_plus(stderr,
527
533
}
528
534
529
535
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
531
537
if(ret != GNUTLS_E_SUCCESS){
532
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
539
" initialization: %s\n",
534
540
safer_gnutls_strerror(ret));
535
541
goto globalfail;
536
542
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
544
if(ret != GNUTLS_E_SUCCESS){
539
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
546
safer_gnutls_strerror(ret));
541
547
goto globalfail;
542
548
}
543
549
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
551
546
552
return 0;
547
553
548
554
globalfail:
549
555
550
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
551
557
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
553
559
return -1;
554
560
}
555
561
556
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
557
564
int ret;
558
565
/* GnuTLS session creation */
559
566
do {
571
578
{
572
579
const char *err;
573
580
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
582
if(quit_now){
576
583
gnutls_deinit(*session);
577
584
return -1;
588
595
589
596
do {
590
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
598
mc->cred);
592
599
if(quit_now){
593
600
gnutls_deinit(*session);
594
601
return -1;
604
611
/* ignore client certificate if any. */
605
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
613
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
615
609
616
return 0;
610
617
}
614
621
__attribute__((unused)) const char *txt){}
615
622
616
623
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
618
625
AvahiIfIndex if_index,
619
int af){
626
int af, mandos_context *mc){
620
627
int ret, tcp_sd = -1;
621
628
ssize_t sret;
622
629
union {
652
659
return -1;
653
660
}
654
661
655
ret = init_gnutls_session(&session);
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
656
695
if(ret != 0){
657
696
return -1;
658
697
}
659
698
660
699
if(debug){
661
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
701
PRIuMAX "\n", ip, (uintmax_t)port);
663
702
}
664
703
665
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
696
735
goto mandos_end;
697
736
}
698
737
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
738
to.in6.sin6_port = htons(port);
703
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
741
-Wunreachable-code*/
729
765
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
766
perror_plus("if_indextoname");
731
767
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
734
770
}
735
771
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
738
774
}
739
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
818
854
goto mandos_end;
819
855
}
820
856
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
862
824
863
if(quit_now){
825
864
errno = EINTR;
930
969
if(buffer_length > 0){
931
970
ssize_t decrypted_buffer_size;
932
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
972
&decrypted_buffer, mc);
934
973
if(decrypted_buffer_size >= 0){
935
974
936
975
written = 0;
997
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1038
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1002
1043
1003
1044
/* Called whenever a service has been resolved successfully or
1004
1045
timed out */
1013
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1056
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
1017
1059
break;
1018
1060
1019
1061
case AVAHI_RESOLVER_FOUND:
1025
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1068
host_name, ip, (intmax_t)interface, port);
1027
1069
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1030
1074
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1075
avahi_simple_poll_quit(simple_poll);
1032
1076
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1035
1083
}
1036
1084
}
1037
1085
}
1047
1095
const char *domain,
1048
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1097
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1052
1102
1053
1103
/* Called whenever a new services becomes available on the LAN or
1054
1104
is removed from the LAN */
1062
1112
case AVAHI_BROWSER_FAILURE:
1063
1113
1064
1114
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1067
1118
return;
1068
1119
1069
1120
case AVAHI_BROWSER_NEW:
1072
1123
the callback function is called the Avahi server will free the
1073
1124
resolver for us. */
1074
1125
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1078
1130
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1131
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1081
1134
break;
1082
1135
1083
1136
case AVAHI_BROWSER_REMOVE:
1102
1155
signal_received = sig;
1103
1156
int old_errno = errno;
1104
1157
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1107
1160
}
1108
1161
errno = old_errno;
1109
1162
}
1110
1163
1111
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1165
int ret;
1166
error_t ret_errno;
1113
1167
1114
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1169
if(s < 0){
1170
ret_errno = errno;
1116
1171
perror_plus("socket");
1172
errno = ret_errno;
1117
1173
return false;
1118
1174
}
1119
1175
strcpy(ifr->ifr_name, ifname);
1120
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1177
if(ret == -1){
1122
1178
if(debug){
1179
ret_errno = errno;
1123
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1124
1182
}
1125
1183
return false;
1126
1184
}
1195
1253
}
1196
1254
1197
1255
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1238
1285
}
1239
1286
1240
1287
int notdotentries(const struct dirent *direntry){
1309
1356
return 1;
1310
1357
}
1311
1358
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1313
1361
int ret;
1314
1362
struct timespec now;
1315
1363
struct timespec waited_time;
1316
1364
intmax_t block_time;
1317
1365
1318
1366
while(true){
1319
if(mc.current_server == NULL){
1367
if(mc->current_server == NULL){
1320
1368
if (debug){
1321
1369
fprintf_plus(stderr, "Wait until first server is found."
1322
1370
" No timeout!\n");
1336
1384
/* Calculating in ms how long time between now and server
1337
1385
who we visted longest time ago. Now - last seen. */
1338
1386
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1387
- mc->current_server->last_seen.tv_sec);
1340
1388
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1389
- mc->current_server->last_seen.tv_nsec);
1342
1390
/* total time is 10s/10,000ms.
1343
1391
Converting to s from ms by dividing by 1,000,
1344
1392
and ns to ms by dividing by 1,000,000. */
1352
1400
}
1353
1401
1354
1402
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
1359
1407
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1408
avahi_simple_poll_quit(s);
1361
1409
return 0;
1362
1410
}
1363
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1412
&mc->current_server->last_seen);
1365
1413
if(ret == -1){
1366
1414
perror_plus("clock_gettime");
1367
1415
return -1;
1368
1416
}
1369
mc.current_server = mc.current_server->next;
1417
mc->current_server = mc->current_server->next;
1370
1418
block_time = 0; /* Call avahi to find new Mandos
1371
1419
servers, but don't block */
1372
1420
}
1381
1429
}
1382
1430
}
1383
1431
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1384
1484
bool run_network_hooks(const char *mode, const char *interface,
1385
1485
const float delay){
1386
1486
struct dirent **direntries;
1389
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
1490
alphasort);
1391
1491
if(numhooks == -1){
1392
perror_plus("scandir");
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1393
1500
} else {
1394
1501
int devnull = open("/dev/null", O_RDONLY);
1395
1502
for(int i = 0; i < numhooks; i++){
1408
1515
if(hook_pid == 0){
1409
1516
/* Child */
1410
1517
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1518
raise_privileges_permanently();
1422
1519
/* Set group */
1423
1520
errno = 0;
1424
1521
ret = setgid(0);
1444
1541
perror_plus("setenv");
1445
1542
_exit(EX_OSERR);
1446
1543
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1448
1545
if(ret == -1){
1449
1546
perror_plus("setenv");
1450
1547
_exit(EX_OSERR);
1467
1564
_exit(EX_OSERR);
1468
1565
}
1469
1566
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1472
1578
} else {
1473
1579
int status;
1474
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1508
1614
return true;
1509
1615
}
1510
1616
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1511
1789
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1512
1794
AvahiSServiceBrowser *sb = NULL;
1513
int error;
1795
error_t ret_errno;
1514
1796
int ret;
1515
1797
intmax_t tmpmax;
1516
1798
char *tmp;
1517
1799
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1524
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1525
1803
bool tempdir_created = false;
1526
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
1805
const char *seckey = PATHDIR "/" SECKEY;
1528
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1529
1809
1530
1810
bool gnutls_initialized = false;
1531
1811
bool gpgme_initialized = false;
1593
1873
.group = 2 },
1594
1874
{ .name = "retry", .key = 132,
1595
1875
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1876
.doc = "Retry interval used when denied by the Mandos server",
1597
1877
.group = 2 },
1598
1878
{ .name = "network-hook-dir", .key = 133,
1599
1879
.arg = "DIR",
1622
1902
connect_to = arg;
1623
1903
break;
1624
1904
case 'i': /* --interface */
1625
interface = arg;
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1626
1910
break;
1627
1911
case 's': /* --seckey */
1628
1912
seckey = arg;
1671
1955
argp_state_help(state, state->out_stream,
1672
1956
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
1957
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
1959
exit(argp_err_exit_status);
1678
1960
break;
1708
1990
<http://bugs.debian.org/633582> */
1709
1991
1710
1992
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1993
if(raise_privileges() == 0){
1716
1994
struct stat st;
1717
1995
1718
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1758
2036
}
1759
2037
1760
2038
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
1765
2056
}
1766
2057
}
1767
2058
}
1768
2059
1769
2060
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
1772
2077
}
1773
2078
1774
2079
if(not debug){
1775
2080
avahi_set_log_function(empty_log);
1776
2081
}
1777
2082
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
2083
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
2084
from the signal handler */
1812
2085
/* Initialize the pseudo-RNG for Avahi */
1813
2086
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
1816
2089
fprintf_plus(stderr,
1817
2090
"Avahi: Failed to create simple poll object.\n");
1818
2091
exitcode = EX_UNAVAILABLE;
1882
2155
}
1883
2156
}
1884
2157
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
1970
2204
}
1971
2205
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
1989
2206
break;
1990
2207
}
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2020
2233
}
2021
2234
2022
2235
if(quit_now){
2023
2236
goto end;
2024
2237
}
2025
2238
2026
ret = init_gnutls_global(pubkey, seckey);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2027
2240
if(ret == -1){
2028
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
2242
exitcode = EX_UNAVAILABLE;
2046
2259
goto end;
2047
2260
}
2048
2261
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2050
2263
fprintf_plus(stderr, "init_gpgme failed\n");
2051
2264
exitcode = EX_UNAVAILABLE;
2052
2265
goto end;
2062
2275
/* Connect directly, do not use Zeroconf */
2063
2276
/* (Mainly meant for debugging) */
2064
2277
char *address = strrchr(connect_to, ':');
2278
2065
2279
if(address == NULL){
2066
2280
fprintf_plus(stderr, "No colon in address\n");
2067
2281
exitcode = EX_USAGE;
2072
2286
goto end;
2073
2287
}
2074
2288
2075
uint16_t port;
2289
in_port_t port;
2076
2290
errno = 0;
2077
2291
tmpmax = strtoimax(address+1, &tmp, 10);
2078
2292
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2293
or tmpmax != (in_port_t)tmpmax){
2080
2294
fprintf_plus(stderr, "Bad port number\n");
2081
2295
exitcode = EX_USAGE;
2082
2296
goto end;
2083
2297
}
2084
2298
2085
2299
if(quit_now){
2086
2300
goto end;
2087
2301
}
2088
2302
2089
port = (uint16_t)tmpmax;
2303
port = (in_port_t)tmpmax;
2090
2304
*address = '\0';
2091
2305
/* Colon in address indicates IPv6 */
2092
2306
int af;
2108
2322
}
2109
2323
2110
2324
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2112
2327
if(quit_now or ret == 0){
2113
2328
break;
2114
2329
}
2116
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
2332
(int)retry_interval);
2118
2333
}
2119
sleep((int)retry_interval);
2334
sleep((unsigned int)retry_interval);
2120
2335
}
2121
2336
2122
2337
if (not quit_now){
2140
2355
config.publish_domain = 0;
2141
2356
2142
2357
/* Allocate a new server */
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2146
2360
2147
2361
/* Free the Avahi configuration data */
2148
2362
avahi_server_config_free(&config);
2151
2365
/* Check if creating the Avahi server object succeeded */
2152
2366
if(mc.server == NULL){
2153
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2368
avahi_strerror(ret_errno));
2155
2369
exitcode = EX_UNAVAILABLE;
2156
2370
goto end;
2157
2371
}
2163
2377
/* Create the Avahi service browser */
2164
2378
sb = avahi_s_service_browser_new(mc.server, if_index,
2165
2379
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
NULL, 0, browse_callback, NULL);
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2167
2382
if(sb == NULL){
2168
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
2384
avahi_strerror(avahi_server_errno(mc.server)));
2181
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
2397
}
2183
2398
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2186
2401
if(debug){
2187
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
2403
(ret == 0) ? "successfully" : "with error");
2195
2410
}
2196
2411
2197
2412
/* Cleanup things */
2413
free(mc.interfaces);
2414
2198
2415
if(sb != NULL)
2199
2416
avahi_s_service_browser_free(sb);
2200
2417
2201
2418
if(mc.server != NULL)
2202
2419
avahi_server_free(mc.server);
2203
2420
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2206
2423
2207
2424
if(gnutls_initialized){
2208
2425
gnutls_certificate_free_credentials(mc.cred);
2225
2442
}
2226
2443
}
2227
2444
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
2445
/* Re-raise priviliges */
2232
2446
{
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2249
2463
}
2250
2464
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2254
2468
}
2255
2469
}
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2263
2476
2264
2477
/* Removes the GPGME temp directory and all files inside */
2265
2478
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0