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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (505.2.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- files removed:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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;
176
170
177
171
/* Function to use when printing errors */
178
172
void perror_plus(const char *print_text){
179
int e = errno;
180
173
fprintf(stderr, "Mandos plugin %s: ",
181
174
program_invocation_short_name);
182
errno = e;
183
175
perror(print_text);
184
176
}
185
177
186
__attribute__((format (gnu_printf, 2, 3)))
187
178
int fprintf_plus(FILE *stream, const char *format, ...){
188
179
va_list ap;
189
180
va_start (ap, format);
190
181
191
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
183
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
185
}
195
186
196
187
/*
201
192
size_t incbuffer(char **buffer, size_t buffer_length,
202
193
size_t buffer_capacity){
203
194
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;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
210
197
return 0;
211
198
}
212
*buffer = new_buf;
213
199
buffer_capacity += BUFFER_SIZE;
214
200
}
215
201
return buffer_capacity;
216
202
}
217
203
218
204
/* 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){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
221
207
int ret;
222
208
server *new_server = malloc(sizeof(server));
223
209
if(new_server == NULL){
224
210
perror_plus("malloc");
225
return false;
211
return -1;
226
212
}
227
213
*new_server = (server){ .ip = strdup(ip),
228
214
.port = port,
230
216
.af = af };
231
217
if(new_server->ip == NULL){
232
218
perror_plus("strdup");
233
return false;
219
return -1;
234
220
}
235
221
/* Special case of first server */
236
if(*current_server == NULL){
222
if (mc.current_server == NULL){
237
223
new_server->next = new_server;
238
224
new_server->prev = new_server;
239
*current_server = new_server;
225
mc.current_server = new_server;
240
226
/* Place the new server last in the list */
241
227
} else {
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
244
230
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
231
mc.current_server->prev = new_server;
246
232
}
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
248
234
if(ret == -1){
249
235
perror_plus("clock_gettime");
250
return false;
236
return -1;
251
237
}
252
return true;
238
return 0;
253
239
}
254
240
255
241
/*
256
242
* Initialize GPGME.
257
243
*/
258
244
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
245
const char *tempdir){
260
246
gpgme_error_t rc;
261
247
gpgme_engine_info_t engine_info;
262
248
249
263
250
/*
264
251
* Helper function to insert pub and seckey to the engine keyring.
265
252
*/
281
268
return false;
282
269
}
283
270
284
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
285
272
if(rc != GPG_ERR_NO_ERROR){
286
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
274
gpgme_strsource(rc), gpgme_strerror(rc));
331
318
}
332
319
333
320
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
335
322
if(rc != GPG_ERR_NO_ERROR){
336
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
339
*/
353
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
341
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
342
char **plaintext){
357
343
gpgme_data_t dh_crypto, dh_plain;
358
344
gpgme_error_t rc;
359
345
ssize_t ret;
385
371
386
372
/* Decrypt data from the cryptotext data buffer to the plaintext
387
373
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
375
if(rc != GPG_ERR_NO_ERROR){
390
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
377
gpgme_strsource(rc), gpgme_strerror(rc));
392
378
plaintext_length = -1;
393
379
if(debug){
394
380
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
396
382
if(result == NULL){
397
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
384
} else {
476
462
}
477
463
478
464
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
480
467
if(ret == NULL)
481
468
ret = "(unknown)";
482
469
return ret;
489
476
}
490
477
491
478
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
479
const char *seckeyfilename){
494
480
int ret;
495
481
496
482
if(debug){
513
499
}
514
500
515
501
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
503
if(ret != GNUTLS_E_SUCCESS){
518
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
505
safer_gnutls_strerror(ret));
529
515
}
530
516
531
517
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
533
519
GNUTLS_OPENPGP_FMT_BASE64);
534
520
if(ret != GNUTLS_E_SUCCESS){
535
521
fprintf_plus(stderr,
541
527
}
542
528
543
529
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
545
531
if(ret != GNUTLS_E_SUCCESS){
546
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
533
" initialization: %s\n",
548
534
safer_gnutls_strerror(ret));
549
535
goto globalfail;
550
536
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
538
if(ret != GNUTLS_E_SUCCESS){
553
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
540
safer_gnutls_strerror(ret));
555
541
goto globalfail;
556
542
}
557
543
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
545
560
546
return 0;
561
547
562
548
globalfail:
563
549
564
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
565
551
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
567
553
return -1;
568
554
}
569
555
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
572
557
int ret;
573
558
/* GnuTLS session creation */
574
559
do {
586
571
{
587
572
const char *err;
588
573
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
575
if(quit_now){
591
576
gnutls_deinit(*session);
592
577
return -1;
603
588
604
589
do {
605
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
591
mc.cred);
607
592
if(quit_now){
608
593
gnutls_deinit(*session);
609
594
return -1;
619
604
/* ignore client certificate if any. */
620
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
606
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
608
624
609
return 0;
625
610
}
629
614
__attribute__((unused)) const char *txt){}
630
615
631
616
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
633
618
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
619
int af){
635
620
int ret, tcp_sd = -1;
636
621
ssize_t sret;
637
622
union {
667
652
return -1;
668
653
}
669
654
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);
655
ret = init_gnutls_session(&session);
703
656
if(ret != 0){
704
657
return -1;
705
658
}
706
659
707
660
if(debug){
708
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
710
663
}
711
664
712
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
743
696
goto mandos_end;
744
697
}
745
698
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
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
751
703
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
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
756
706
if(if_index == AVAHI_IF_UNSPEC){
757
707
fprintf_plus(stderr, "An IPv6 link-local address is"
758
708
" incomplete without a network interface\n");
763
713
to.in6.sin6_scope_id = (uint32_t)if_index;
764
714
}
765
715
} else {
766
to.in.sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
767
719
}
768
720
769
721
if(quit_now){
777
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
730
perror_plus("if_indextoname");
779
731
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
782
734
}
783
735
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
786
738
}
787
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
789
742
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
793
745
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
797
748
}
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);
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
804
755
}
805
756
}
806
757
867
818
goto mandos_end;
868
819
}
869
820
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);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
823
876
824
if(quit_now){
877
825
errno = EINTR;
982
930
if(buffer_length > 0){
983
931
ssize_t decrypted_buffer_size;
984
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
933
&decrypted_buffer);
986
934
if(decrypted_buffer_size >= 0){
987
935
988
936
written = 0;
1049
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1050
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1051
999
flags,
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1056
1002
1057
1003
/* Called whenever a service has been resolved successfully or
1058
1004
timed out */
1067
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
1015
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1072
1017
break;
1073
1018
1074
1019
case AVAHI_RESOLVER_FOUND:
1080
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
1026
host_name, ip, (intmax_t)interface, port);
1082
1027
}
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1087
1030
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1089
1032
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1096
1035
}
1097
1036
}
1098
1037
}
1108
1047
const char *domain,
1109
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
1049
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1115
1052
1116
1053
/* Called whenever a new services becomes available on the LAN or
1117
1054
is removed from the LAN */
1125
1062
case AVAHI_BROWSER_FAILURE:
1126
1063
1127
1064
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);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1131
1067
return;
1132
1068
1133
1069
case AVAHI_BROWSER_NEW:
1136
1072
the callback function is called the Avahi server will free the
1137
1073
resolver for us. */
1138
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1143
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
1079
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1147
1081
break;
1148
1082
1149
1083
case AVAHI_BROWSER_REMOVE:
1168
1102
signal_received = sig;
1169
1103
int old_errno = errno;
1170
1104
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1173
1107
}
1174
1108
errno = old_errno;
1175
1109
}
1176
1110
1177
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
1112
int ret;
1179
error_t ret_errno;
1180
1113
1181
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
1115
if(s < 0){
1183
ret_errno = errno;
1184
1116
perror_plus("socket");
1185
errno = ret_errno;
1186
1117
return false;
1187
1118
}
1188
1119
strcpy(ifr->ifr_name, ifname);
1189
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
1121
if(ret == -1){
1191
1122
if(debug){
1192
ret_errno = errno;
1193
1123
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
1124
}
1196
1125
return false;
1197
1126
}
1266
1195
}
1267
1196
1268
1197
/*
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);
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;
1298
1238
}
1299
1239
1300
1240
int notdotentries(const struct dirent *direntry){
1369
1309
return 1;
1370
1310
}
1371
1311
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1374
1313
int ret;
1375
1314
struct timespec now;
1376
1315
struct timespec waited_time;
1377
1316
intmax_t block_time;
1378
1317
1379
1318
while(true){
1380
if(mc->current_server == NULL){
1319
if(mc.current_server == NULL){
1381
1320
if (debug){
1382
1321
fprintf_plus(stderr, "Wait until first server is found."
1383
1322
" No timeout!\n");
1397
1336
/* Calculating in ms how long time between now and server
1398
1337
who we visted longest time ago. Now - last seen. */
1399
1338
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1401
1340
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1403
1342
/* total time is 10s/10,000ms.
1404
1343
Converting to s from ms by dividing by 1,000,
1405
1344
and ns to ms by dividing by 1,000,000. */
1413
1352
}
1414
1353
1415
1354
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);
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);
1420
1359
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1422
1361
return 0;
1423
1362
}
1424
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1426
1365
if(ret == -1){
1427
1366
perror_plus("clock_gettime");
1428
1367
return -1;
1429
1368
}
1430
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1431
1370
block_time = 0; /* Call avahi to find new Mandos
1432
1371
servers, but don't block */
1433
1372
}
1442
1381
}
1443
1382
}
1444
1383
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
1384
bool run_network_hooks(const char *mode, const char *interface,
1498
1385
const float delay){
1499
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1500
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
1390
alphasort);
1502
1391
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
}
1392
perror_plus("scandir");
1511
1393
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
1394
int devnull = open("/dev/null", O_RDONLY);
1515
1395
for(int i = 0; i < numhooks; i++){
1516
1396
direntry = direntries[i];
1528
1408
if(hook_pid == 0){
1529
1409
/* Child */
1530
1410
/* Raise privileges */
1531
raise_privileges_permanently();
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
}
1532
1422
/* Set group */
1533
1423
errno = 0;
1534
1424
ret = setgid(0);
1541
1431
if(ret == -1){
1542
1432
perror_plus("setgroups");
1543
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1544
1436
dup2(devnull, STDIN_FILENO);
1545
1437
close(devnull);
1546
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1554
1446
perror_plus("setenv");
1555
1447
_exit(EX_OSERR);
1556
1448
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1558
1450
if(ret == -1){
1559
1451
perror_plus("setenv");
1560
1452
_exit(EX_OSERR);
1577
1469
_exit(EX_OSERR);
1578
1470
}
1579
1471
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1591
1474
} else {
1592
1475
int status;
1593
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1627
1510
return true;
1628
1511
}
1629
1512
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
1513
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
1514
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
1515
int error;
1807
1516
int ret;
1808
1517
intmax_t tmpmax;
1809
1518
char *tmp;
1810
1519
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1813
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1814
1527
bool tempdir_created = false;
1815
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
1529
const char *seckey = PATHDIR "/" SECKEY;
1817
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
1531
1820
1532
bool gnutls_initialized = false;
1821
1533
bool gpgme_initialized = false;
1883
1595
.group = 2 },
1884
1596
{ .name = "retry", .key = 132,
1885
1597
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
1887
1599
.group = 2 },
1888
1600
{ .name = "network-hook-dir", .key = 133,
1889
1601
.arg = "DIR",
1912
1624
connect_to = arg;
1913
1625
break;
1914
1626
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
}
1627
interface = arg;
1920
1628
break;
1921
1629
case 's': /* --seckey */
1922
1630
seckey = arg;
1965
1673
argp_state_help(state, state->out_stream,
1966
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1968
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
1679
exit(argp_err_exit_status);
1970
1680
break;
2000
1710
<http://bugs.debian.org/633582> */
2001
1711
2002
1712
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
2004
1718
struct stat st;
2005
1719
2006
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2046
1760
}
2047
1761
2048
1762
/* 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;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2066
1767
}
2067
1768
}
2068
1769
}
2069
1770
2070
1771
/* 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
}
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2085
1774
}
2086
1775
2087
1776
if(not debug){
2088
1777
avahi_set_log_function(empty_log);
2089
1778
}
2090
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2091
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
1813
from the signal handler */
2093
1814
/* Initialize the pseudo-RNG for Avahi */
2094
1815
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2097
1818
fprintf_plus(stderr,
2098
1819
"Avahi: Failed to create simple poll object.\n");
2099
1820
exitcode = EX_UNAVAILABLE;
2163
1884
}
2164
1885
}
2165
1886
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;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2213
1972
}
2214
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
2215
1991
break;
2216
1992
}
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);
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2246
2022
}
2247
2023
2248
2024
if(quit_now){
2249
2025
goto end;
2250
2026
}
2251
2027
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2253
2029
if(ret == -1){
2254
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
2031
exitcode = EX_UNAVAILABLE;
2272
2048
goto end;
2273
2049
}
2274
2050
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2276
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2277
2053
exitcode = EX_UNAVAILABLE;
2278
2054
goto end;
2288
2064
/* Connect directly, do not use Zeroconf */
2289
2065
/* (Mainly meant for debugging) */
2290
2066
char *address = strrchr(connect_to, ':');
2291
2292
2067
if(address == NULL){
2293
2068
fprintf_plus(stderr, "No colon in address\n");
2294
2069
exitcode = EX_USAGE;
2299
2074
goto end;
2300
2075
}
2301
2076
2302
in_port_t port;
2077
uint16_t port;
2303
2078
errno = 0;
2304
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2305
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2307
2082
fprintf_plus(stderr, "Bad port number\n");
2308
2083
exitcode = EX_USAGE;
2309
2084
goto end;
2310
2085
}
2311
2086
2312
2087
if(quit_now){
2313
2088
goto end;
2314
2089
}
2315
2090
2316
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2317
2092
*address = '\0';
2318
2093
/* Colon in address indicates IPv6 */
2319
2094
int af;
2335
2110
}
2336
2111
2337
2112
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2340
2114
if(quit_now or ret == 0){
2341
2115
break;
2342
2116
}
2344
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
2119
(int)retry_interval);
2346
2120
}
2347
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2348
2122
}
2349
2123
2350
2124
if (not quit_now){
2368
2142
config.publish_domain = 0;
2369
2143
2370
2144
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2373
2148
2374
2149
/* Free the Avahi configuration data */
2375
2150
avahi_server_config_free(&config);
2378
2153
/* Check if creating the Avahi server object succeeded */
2379
2154
if(mc.server == NULL){
2380
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2382
2157
exitcode = EX_UNAVAILABLE;
2383
2158
goto end;
2384
2159
}
2390
2165
/* Create the Avahi service browser */
2391
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2395
2169
if(sb == NULL){
2396
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
2171
avahi_strerror(avahi_server_errno(mc.server)));
2409
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
2184
}
2411
2185
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2414
2188
if(debug){
2415
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
2190
(ret == 0) ? "successfully" : "with error");
2423
2197
}
2424
2198
2425
2199
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
2200
if(sb != NULL)
2429
2201
avahi_s_service_browser_free(sb);
2430
2202
2431
2203
if(mc.server != NULL)
2432
2204
avahi_server_free(mc.server);
2433
2205
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2436
2208
2437
2209
if(gnutls_initialized){
2438
2210
gnutls_certificate_free_credentials(mc.cred);
2455
2227
}
2456
2228
}
2457
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2458
2233
/* Re-raise priviliges */
2459
2234
{
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");
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2239
}
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2476
2251
}
2477
2252
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2481
2256
}
2482
2257
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2489
2265
2490
2266
/* Removes the GPGME temp directory and all files inside */
2491
2267
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0