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- Committer: Teddy Hogeborn
- Date: 2012-05-01 20:07:28 UTC
- Revision ID: teddy@recompile.se-20120501200728-tv1dn5uern8jshyn
* mandos (Client.stop_checker): Use new Popen.terminate() method.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
91
98
92
#ifdef __linux__
99
93
#include <sys/klog.h> /* klogctl() */
141
135
static const char sys_class_net[] = "/sys/class/net";
142
136
char *connect_to = NULL;
143
137
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
138
147
139
/* Doubly linked list that need to be circularly linked when used */
148
140
typedef struct server{
149
141
const char *ip;
150
in_port_t port;
142
uint16_t port;
151
143
AvahiIfIndex if_index;
152
144
int af;
153
145
struct timespec last_seen;
157
149
158
150
/* Used for passing in values through the Avahi callback functions */
159
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
160
153
AvahiServer *server;
161
154
gnutls_certificate_credentials_t cred;
162
155
unsigned int dh_bits;
164
157
const char *priority;
165
158
gpgme_ctx_t ctx;
166
159
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
160
} mandos_context;
170
161
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
167
174
168
sig_atomic_t quit_now = 0;
175
169
int signal_received = 0;
190
184
191
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
186
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
188
}
195
189
196
190
/*
201
195
size_t incbuffer(char **buffer, size_t buffer_length,
202
196
size_t buffer_capacity){
203
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
210
200
return 0;
211
201
}
212
*buffer = new_buf;
213
202
buffer_capacity += BUFFER_SIZE;
214
203
}
215
204
return buffer_capacity;
216
205
}
217
206
218
207
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
221
210
int ret;
222
211
server *new_server = malloc(sizeof(server));
223
212
if(new_server == NULL){
233
222
return false;
234
223
}
235
224
/* Special case of first server */
236
if(*current_server == NULL){
225
if (mc.current_server == NULL){
237
226
new_server->next = new_server;
238
227
new_server->prev = new_server;
239
*current_server = new_server;
228
mc.current_server = new_server;
240
229
/* Place the new server last in the list */
241
230
} else {
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
244
233
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
246
235
}
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
248
237
if(ret == -1){
249
238
perror_plus("clock_gettime");
250
239
return false;
256
245
* Initialize GPGME.
257
246
*/
258
247
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
248
const char *tempdir){
260
249
gpgme_error_t rc;
261
250
gpgme_engine_info_t engine_info;
262
251
252
263
253
/*
264
254
* Helper function to insert pub and seckey to the engine keyring.
265
255
*/
281
271
return false;
282
272
}
283
273
284
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
285
275
if(rc != GPG_ERR_NO_ERROR){
286
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
277
gpgme_strsource(rc), gpgme_strerror(rc));
331
321
}
332
322
333
323
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
335
325
if(rc != GPG_ERR_NO_ERROR){
336
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
342
*/
353
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
344
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
345
char **plaintext){
357
346
gpgme_data_t dh_crypto, dh_plain;
358
347
gpgme_error_t rc;
359
348
ssize_t ret;
385
374
386
375
/* Decrypt data from the cryptotext data buffer to the plaintext
387
376
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
378
if(rc != GPG_ERR_NO_ERROR){
390
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
380
gpgme_strsource(rc), gpgme_strerror(rc));
392
381
plaintext_length = -1;
393
382
if(debug){
394
383
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
396
385
if(result == NULL){
397
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
387
} else {
476
465
}
477
466
478
467
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
480
470
if(ret == NULL)
481
471
ret = "(unknown)";
482
472
return ret;
489
479
}
490
480
491
481
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
482
const char *seckeyfilename){
494
483
int ret;
495
484
496
485
if(debug){
513
502
}
514
503
515
504
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
506
if(ret != GNUTLS_E_SUCCESS){
518
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
508
safer_gnutls_strerror(ret));
529
518
}
530
519
531
520
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
533
522
GNUTLS_OPENPGP_FMT_BASE64);
534
523
if(ret != GNUTLS_E_SUCCESS){
535
524
fprintf_plus(stderr,
541
530
}
542
531
543
532
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
545
534
if(ret != GNUTLS_E_SUCCESS){
546
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
536
" initialization: %s\n",
548
537
safer_gnutls_strerror(ret));
549
538
goto globalfail;
550
539
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
541
if(ret != GNUTLS_E_SUCCESS){
553
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
543
safer_gnutls_strerror(ret));
555
544
goto globalfail;
556
545
}
557
546
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
548
560
549
return 0;
561
550
562
551
globalfail:
563
552
564
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
565
554
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
567
556
return -1;
568
557
}
569
558
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
572
560
int ret;
573
561
/* GnuTLS session creation */
574
562
do {
586
574
{
587
575
const char *err;
588
576
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
578
if(quit_now){
591
579
gnutls_deinit(*session);
592
580
return -1;
603
591
604
592
do {
605
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
594
mc.cred);
607
595
if(quit_now){
608
596
gnutls_deinit(*session);
609
597
return -1;
619
607
/* ignore client certificate if any. */
620
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
609
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
611
624
612
return 0;
625
613
}
629
617
__attribute__((unused)) const char *txt){}
630
618
631
619
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
633
621
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
622
int af){
635
623
int ret, tcp_sd = -1;
636
624
ssize_t sret;
637
625
union {
667
655
return -1;
668
656
}
669
657
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
703
659
if(ret != 0){
704
660
return -1;
705
661
}
706
662
707
663
if(debug){
708
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
710
666
}
711
667
712
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
743
699
goto mandos_end;
744
700
}
745
701
if(af == AF_INET6){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
751
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
756
709
if(if_index == AVAHI_IF_UNSPEC){
757
710
fprintf_plus(stderr, "An IPv6 link-local address is"
758
711
" incomplete without a network interface\n");
763
716
to.in6.sin6_scope_id = (uint32_t)if_index;
764
717
}
765
718
} else {
766
to.in.sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
767
722
}
768
723
769
724
if(quit_now){
777
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
733
perror_plus("if_indextoname");
779
734
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
782
737
}
783
738
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
786
741
}
787
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
789
745
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
793
748
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
797
751
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
804
758
}
805
759
}
806
760
867
821
goto mandos_end;
868
822
}
869
823
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
826
876
827
if(quit_now){
877
828
errno = EINTR;
982
933
if(buffer_length > 0){
983
934
ssize_t decrypted_buffer_size;
984
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
936
&decrypted_buffer);
986
937
if(decrypted_buffer_size >= 0){
987
938
988
939
written = 0;
1049
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1050
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1051
1002
flags,
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1056
1005
1057
1006
/* Called whenever a service has been resolved successfully or
1058
1007
timed out */
1067
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
1018
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
1019
avahi_strerror(avahi_server_errno(mc.server)));
1072
1020
break;
1073
1021
1074
1022
case AVAHI_RESOLVER_FOUND:
1080
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
1029
host_name, ip, (intmax_t)interface, port);
1082
1030
}
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1087
1033
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1034
avahi_simple_poll_quit(mc.simple_poll);
1089
1035
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1093
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
1039
" list\n", name);
1095
1040
}
1108
1053
const char *domain,
1109
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
1055
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1115
1058
1116
1059
/* Called whenever a new services becomes available on the LAN or
1117
1060
is removed from the LAN */
1125
1068
case AVAHI_BROWSER_FAILURE:
1126
1069
1127
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1131
1073
return;
1132
1074
1133
1075
case AVAHI_BROWSER_NEW:
1136
1078
the callback function is called the Avahi server will free the
1137
1079
resolver for us. */
1138
1080
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1143
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
1085
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
1086
avahi_strerror(avahi_server_errno(mc.server)));
1147
1087
break;
1148
1088
1149
1089
case AVAHI_BROWSER_REMOVE:
1168
1108
signal_received = sig;
1169
1109
int old_errno = errno;
1170
1110
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1173
1113
}
1174
1114
errno = old_errno;
1175
1115
}
1176
1116
1177
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
1118
int ret;
1179
error_t ret_errno;
1180
1119
1181
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
1121
if(s < 0){
1183
ret_errno = errno;
1184
1122
perror_plus("socket");
1185
errno = ret_errno;
1186
1123
return false;
1187
1124
}
1188
1125
strcpy(ifr->ifr_name, ifname);
1189
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
1127
if(ret == -1){
1191
1128
if(debug){
1192
ret_errno = errno;
1193
1129
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
1130
}
1196
1131
return false;
1197
1132
}
1266
1201
}
1267
1202
1268
1203
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1298
1244
}
1299
1245
1300
1246
int notdotentries(const struct dirent *direntry){
1369
1315
return 1;
1370
1316
}
1371
1317
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1374
1319
int ret;
1375
1320
struct timespec now;
1376
1321
struct timespec waited_time;
1377
1322
intmax_t block_time;
1378
1323
1379
1324
while(true){
1380
if(mc->current_server == NULL){
1325
if(mc.current_server == NULL){
1381
1326
if (debug){
1382
1327
fprintf_plus(stderr, "Wait until first server is found."
1383
1328
" No timeout!\n");
1397
1342
/* Calculating in ms how long time between now and server
1398
1343
who we visted longest time ago. Now - last seen. */
1399
1344
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1345
- mc.current_server->last_seen.tv_sec);
1401
1346
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1347
- mc.current_server->last_seen.tv_nsec);
1403
1348
/* total time is 10s/10,000ms.
1404
1349
Converting to s from ms by dividing by 1,000,
1405
1350
and ns to ms by dividing by 1,000,000. */
1413
1358
}
1414
1359
1415
1360
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1420
1365
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1366
avahi_simple_poll_quit(mc.simple_poll);
1422
1367
return 0;
1423
1368
}
1424
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1370
&mc.current_server->last_seen);
1426
1371
if(ret == -1){
1427
1372
perror_plus("clock_gettime");
1428
1373
return -1;
1429
1374
}
1430
mc->current_server = mc->current_server->next;
1375
mc.current_server = mc.current_server->next;
1431
1376
block_time = 0; /* Call avahi to find new Mandos
1432
1377
servers, but don't block */
1433
1378
}
1442
1387
}
1443
1388
}
1444
1389
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
1390
bool run_network_hooks(const char *mode, const char *interface,
1498
1391
const float delay){
1499
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1500
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
1396
alphasort);
1502
1397
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1398
perror_plus("scandir");
1511
1399
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
1400
int devnull = open("/dev/null", O_RDONLY);
1515
1401
for(int i = 0; i < numhooks; i++){
1516
1402
direntry = direntries[i];
1528
1414
if(hook_pid == 0){
1529
1415
/* Child */
1530
1416
/* Raise privileges */
1531
raise_privileges_permanently();
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1532
1428
/* Set group */
1533
1429
errno = 0;
1534
1430
ret = setgid(0);
1627
1523
return true;
1628
1524
}
1629
1525
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1798
}
1799
1800
1526
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
1527
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
1528
int error;
1807
1529
int ret;
1808
1530
intmax_t tmpmax;
1809
1531
char *tmp;
1810
1532
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1813
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1814
1540
bool tempdir_created = false;
1815
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
1542
const char *seckey = PATHDIR "/" SECKEY;
1817
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
1544
1820
1545
bool gnutls_initialized = false;
1821
1546
bool gpgme_initialized = false;
1912
1637
connect_to = arg;
1913
1638
break;
1914
1639
case 'i': /* --interface */
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1640
interface = arg;
1920
1641
break;
1921
1642
case 's': /* --seckey */
1922
1643
seckey = arg;
2000
1721
<http://bugs.debian.org/633582> */
2001
1722
2002
1723
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
2004
1729
struct stat st;
2005
1730
2006
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2046
1771
}
2047
1772
2048
1773
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2066
1778
}
2067
1779
}
2068
1780
}
2069
1781
2070
1782
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2076
goto end;
2077
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2085
1785
}
2086
1786
2087
1787
if(not debug){
2088
1788
avahi_set_log_function(empty_log);
2089
1789
}
2090
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
2091
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
1824
from the signal handler */
2093
1825
/* Initialize the pseudo-RNG for Avahi */
2094
1826
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2097
1829
fprintf_plus(stderr,
2098
1830
"Avahi: Failed to create simple poll object.\n");
2099
1831
exitcode = EX_UNAVAILABLE;
2163
1895
}
2164
1896
}
2165
1897
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2213
1983
}
2214
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2215
2002
break;
2216
2003
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2246
2033
}
2247
2034
2248
2035
if(quit_now){
2249
2036
goto end;
2250
2037
}
2251
2038
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2039
ret = init_gnutls_global(pubkey, seckey);
2253
2040
if(ret == -1){
2254
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
2042
exitcode = EX_UNAVAILABLE;
2272
2059
goto end;
2273
2060
}
2274
2061
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2276
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2277
2064
exitcode = EX_UNAVAILABLE;
2278
2065
goto end;
2288
2075
/* Connect directly, do not use Zeroconf */
2289
2076
/* (Mainly meant for debugging) */
2290
2077
char *address = strrchr(connect_to, ':');
2291
2292
2078
if(address == NULL){
2293
2079
fprintf_plus(stderr, "No colon in address\n");
2294
2080
exitcode = EX_USAGE;
2299
2085
goto end;
2300
2086
}
2301
2087
2302
in_port_t port;
2088
uint16_t port;
2303
2089
errno = 0;
2304
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2305
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2092
or tmpmax != (uint16_t)tmpmax){
2307
2093
fprintf_plus(stderr, "Bad port number\n");
2308
2094
exitcode = EX_USAGE;
2309
2095
goto end;
2310
2096
}
2311
2097
2312
2098
if(quit_now){
2313
2099
goto end;
2314
2100
}
2315
2101
2316
port = (in_port_t)tmpmax;
2102
port = (uint16_t)tmpmax;
2317
2103
*address = '\0';
2318
2104
/* Colon in address indicates IPv6 */
2319
2105
int af;
2335
2121
}
2336
2122
2337
2123
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2124
ret = start_mandos_communication(address, port, if_index, af);
2340
2125
if(quit_now or ret == 0){
2341
2126
break;
2342
2127
}
2344
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
2130
(int)retry_interval);
2346
2131
}
2347
sleep((unsigned int)retry_interval);
2132
sleep((int)retry_interval);
2348
2133
}
2349
2134
2350
2135
if (not quit_now){
2368
2153
config.publish_domain = 0;
2369
2154
2370
2155
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2373
2159
2374
2160
/* Free the Avahi configuration data */
2375
2161
avahi_server_config_free(&config);
2378
2164
/* Check if creating the Avahi server object succeeded */
2379
2165
if(mc.server == NULL){
2380
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2167
avahi_strerror(error));
2382
2168
exitcode = EX_UNAVAILABLE;
2383
2169
goto end;
2384
2170
}
2390
2176
/* Create the Avahi service browser */
2391
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2179
NULL, 0, browse_callback, NULL);
2395
2180
if(sb == NULL){
2396
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
2182
avahi_strerror(avahi_server_errno(mc.server)));
2409
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
2195
}
2411
2196
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2414
2199
if(debug){
2415
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
2201
(ret == 0) ? "successfully" : "with error");
2423
2208
}
2424
2209
2425
2210
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
2211
if(sb != NULL)
2429
2212
avahi_s_service_browser_free(sb);
2430
2213
2431
2214
if(mc.server != NULL)
2432
2215
avahi_server_free(mc.server);
2433
2216
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2436
2219
2437
2220
if(gnutls_initialized){
2438
2221
gnutls_certificate_free_credentials(mc.cred);
2455
2238
}
2456
2239
}
2457
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2458
2244
/* Re-raise priviliges */
2459
2245
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2476
2262
}
2477
2263
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2481
2267
}
2482
2268
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2489
2276
2490
2277
/* Removes the GPGME temp directory and all files inside */
2491
2278
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0