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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- 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() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
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,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
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
90
98
91
#ifdef __linux__
99
92
#include <sys/klog.h> /* klogctl() */
141
134
static const char sys_class_net[] = "/sys/class/net";
142
135
char *connect_to = NULL;
143
136
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
137
147
138
/* Doubly linked list that need to be circularly linked when used */
148
139
typedef struct server{
149
140
const char *ip;
150
in_port_t port;
141
uint16_t port;
151
142
AvahiIfIndex if_index;
152
143
int af;
153
144
struct timespec last_seen;
157
148
158
149
/* Used for passing in values through the Avahi callback functions */
159
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
160
152
AvahiServer *server;
161
153
gnutls_certificate_credentials_t cred;
162
154
unsigned int dh_bits;
164
156
const char *priority;
165
157
gpgme_ctx_t ctx;
166
158
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
159
} mandos_context;
170
160
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
166
174
167
sig_atomic_t quit_now = 0;
175
168
int signal_received = 0;
176
169
177
170
/* Function to use when printing errors */
178
171
void perror_plus(const char *print_text){
179
int e = errno;
180
172
fprintf(stderr, "Mandos plugin %s: ",
181
173
program_invocation_short_name);
182
errno = e;
183
174
perror(print_text);
184
175
}
185
176
186
__attribute__((format (gnu_printf, 2, 3)))
187
177
int fprintf_plus(FILE *stream, const char *format, ...){
188
178
va_list ap;
189
179
va_start (ap, format);
190
180
191
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
182
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
184
}
195
185
196
186
/*
201
191
size_t incbuffer(char **buffer, size_t buffer_length,
202
192
size_t buffer_capacity){
203
193
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;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
210
196
return 0;
211
197
}
212
*buffer = new_buf;
213
198
buffer_capacity += BUFFER_SIZE;
214
199
}
215
200
return buffer_capacity;
216
201
}
217
202
218
203
/* 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){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
221
206
int ret;
222
207
server *new_server = malloc(sizeof(server));
223
208
if(new_server == NULL){
224
209
perror_plus("malloc");
225
return false;
210
return -1;
226
211
}
227
212
*new_server = (server){ .ip = strdup(ip),
228
213
.port = port,
230
215
.af = af };
231
216
if(new_server->ip == NULL){
232
217
perror_plus("strdup");
233
return false;
218
return -1;
234
219
}
235
220
/* Special case of first server */
236
if(*current_server == NULL){
221
if (mc.current_server == NULL){
237
222
new_server->next = new_server;
238
223
new_server->prev = new_server;
239
*current_server = new_server;
224
mc.current_server = new_server;
240
225
/* Place the new server last in the list */
241
226
} else {
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
244
229
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
230
mc.current_server->prev = new_server;
246
231
}
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
248
233
if(ret == -1){
249
234
perror_plus("clock_gettime");
250
return false;
235
return -1;
251
236
}
252
return true;
237
return 0;
253
238
}
254
239
255
240
/*
256
241
* Initialize GPGME.
257
242
*/
258
243
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
244
const char *tempdir){
260
245
gpgme_error_t rc;
261
246
gpgme_engine_info_t engine_info;
262
247
248
263
249
/*
264
250
* Helper function to insert pub and seckey to the engine keyring.
265
251
*/
281
267
return false;
282
268
}
283
269
284
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
285
271
if(rc != GPG_ERR_NO_ERROR){
286
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
273
gpgme_strsource(rc), gpgme_strerror(rc));
331
317
}
332
318
333
319
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
335
321
if(rc != GPG_ERR_NO_ERROR){
336
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
338
*/
353
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
340
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
341
char **plaintext){
357
342
gpgme_data_t dh_crypto, dh_plain;
358
343
gpgme_error_t rc;
359
344
ssize_t ret;
385
370
386
371
/* Decrypt data from the cryptotext data buffer to the plaintext
387
372
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
374
if(rc != GPG_ERR_NO_ERROR){
390
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
376
gpgme_strsource(rc), gpgme_strerror(rc));
392
377
plaintext_length = -1;
393
378
if(debug){
394
379
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
396
381
if(result == NULL){
397
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
383
} else {
476
461
}
477
462
478
463
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
480
466
if(ret == NULL)
481
467
ret = "(unknown)";
482
468
return ret;
489
475
}
490
476
491
477
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
478
const char *seckeyfilename){
494
479
int ret;
495
480
496
481
if(debug){
513
498
}
514
499
515
500
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
502
if(ret != GNUTLS_E_SUCCESS){
518
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
504
safer_gnutls_strerror(ret));
529
514
}
530
515
531
516
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
533
518
GNUTLS_OPENPGP_FMT_BASE64);
534
519
if(ret != GNUTLS_E_SUCCESS){
535
520
fprintf_plus(stderr,
541
526
}
542
527
543
528
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
545
530
if(ret != GNUTLS_E_SUCCESS){
546
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
532
" initialization: %s\n",
548
533
safer_gnutls_strerror(ret));
549
534
goto globalfail;
550
535
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
537
if(ret != GNUTLS_E_SUCCESS){
553
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
539
safer_gnutls_strerror(ret));
555
540
goto globalfail;
556
541
}
557
542
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
544
560
545
return 0;
561
546
562
547
globalfail:
563
548
564
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
565
550
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
567
552
return -1;
568
553
}
569
554
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
572
556
int ret;
573
557
/* GnuTLS session creation */
574
558
do {
586
570
{
587
571
const char *err;
588
572
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
574
if(quit_now){
591
575
gnutls_deinit(*session);
592
576
return -1;
603
587
604
588
do {
605
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
590
mc.cred);
607
591
if(quit_now){
608
592
gnutls_deinit(*session);
609
593
return -1;
619
603
/* ignore client certificate if any. */
620
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
605
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
607
624
608
return 0;
625
609
}
629
613
__attribute__((unused)) const char *txt){}
630
614
631
615
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
633
617
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
618
int af){
635
619
int ret, tcp_sd = -1;
636
620
ssize_t sret;
637
621
union {
667
651
return -1;
668
652
}
669
653
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);
654
ret = init_gnutls_session(&session);
703
655
if(ret != 0){
704
656
return -1;
705
657
}
706
658
707
659
if(debug){
708
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
710
662
}
711
663
712
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
743
695
goto mandos_end;
744
696
}
745
697
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
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
751
702
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
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
756
705
if(if_index == AVAHI_IF_UNSPEC){
757
706
fprintf_plus(stderr, "An IPv6 link-local address is"
758
707
" incomplete without a network interface\n");
763
712
to.in6.sin6_scope_id = (uint32_t)if_index;
764
713
}
765
714
} else {
766
to.in.sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
767
718
}
768
719
769
720
if(quit_now){
777
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
729
perror_plus("if_indextoname");
779
730
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
782
733
}
783
734
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
786
737
}
787
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
789
741
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
793
744
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
797
747
}
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);
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
804
754
}
805
755
}
806
756
867
817
goto mandos_end;
868
818
}
869
819
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);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
822
876
823
if(quit_now){
877
824
errno = EINTR;
982
929
if(buffer_length > 0){
983
930
ssize_t decrypted_buffer_size;
984
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
932
&decrypted_buffer);
986
933
if(decrypted_buffer_size >= 0){
987
934
988
935
written = 0;
1049
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1050
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1051
998
flags,
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1056
1001
1057
1002
/* Called whenever a service has been resolved successfully or
1058
1003
timed out */
1067
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
1014
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1072
1016
break;
1073
1017
1074
1018
case AVAHI_RESOLVER_FOUND:
1080
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
1025
host_name, ip, (intmax_t)interface, port);
1082
1026
}
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1087
1029
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1089
1031
} 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
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1096
1034
}
1097
1035
}
1098
1036
}
1108
1046
const char *domain,
1109
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
1048
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1115
1051
1116
1052
/* Called whenever a new services becomes available on the LAN or
1117
1053
is removed from the LAN */
1125
1061
case AVAHI_BROWSER_FAILURE:
1126
1062
1127
1063
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);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1131
1066
return;
1132
1067
1133
1068
case AVAHI_BROWSER_NEW:
1136
1071
the callback function is called the Avahi server will free the
1137
1072
resolver for us. */
1138
1073
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)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1143
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
1078
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1147
1080
break;
1148
1081
1149
1082
case AVAHI_BROWSER_REMOVE:
1168
1101
signal_received = sig;
1169
1102
int old_errno = errno;
1170
1103
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1173
1106
}
1174
1107
errno = old_errno;
1175
1108
}
1176
1109
1177
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
1111
int ret;
1179
error_t ret_errno;
1180
1112
1181
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
1114
if(s < 0){
1183
ret_errno = errno;
1184
1115
perror_plus("socket");
1185
errno = ret_errno;
1186
1116
return false;
1187
1117
}
1188
1118
strcpy(ifr->ifr_name, ifname);
1189
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
1120
if(ret == -1){
1191
1121
if(debug){
1192
ret_errno = errno;
1193
1122
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
1123
}
1196
1124
return false;
1197
1125
}
1266
1194
}
1267
1195
1268
1196
/*
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);
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1298
1237
}
1299
1238
1300
1239
int notdotentries(const struct dirent *direntry){
1362
1301
}
1363
1302
return 0;
1364
1303
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1369
1304
return 1;
1370
1305
}
1371
1306
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1374
1308
int ret;
1375
1309
struct timespec now;
1376
1310
struct timespec waited_time;
1377
1311
intmax_t block_time;
1378
1312
1379
1313
while(true){
1380
if(mc->current_server == NULL){
1314
if(mc.current_server == NULL){
1381
1315
if (debug){
1382
1316
fprintf_plus(stderr, "Wait until first server is found."
1383
1317
" No timeout!\n");
1397
1331
/* Calculating in ms how long time between now and server
1398
1332
who we visted longest time ago. Now - last seen. */
1399
1333
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1401
1335
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1403
1337
/* total time is 10s/10,000ms.
1404
1338
Converting to s from ms by dividing by 1,000,
1405
1339
and ns to ms by dividing by 1,000,000. */
1413
1347
}
1414
1348
1415
1349
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);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1420
1354
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1422
1356
return 0;
1423
1357
}
1424
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1426
1360
if(ret == -1){
1427
1361
perror_plus("clock_gettime");
1428
1362
return -1;
1429
1363
}
1430
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1431
1365
block_time = 0; /* Call avahi to find new Mandos
1432
1366
servers, but don't block */
1433
1367
}
1442
1376
}
1443
1377
}
1444
1378
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
1379
bool run_network_hooks(const char *mode, const char *interface,
1498
1380
const float delay){
1499
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1500
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
1385
alphasort);
1502
1386
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
}
1387
perror_plus("scandir");
1511
1388
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
1389
int devnull = open("/dev/null", O_RDONLY);
1515
1390
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1391
direntry = direntries[0];
1517
1392
char *fullname = NULL;
1518
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
1394
if(ret < 0){
1520
1395
perror_plus("asprintf");
1521
1396
continue;
1522
1397
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
1398
pid_t hook_pid = fork();
1528
1399
if(hook_pid == 0){
1529
1400
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
1401
dup2(devnull, STDIN_FILENO);
1545
1402
close(devnull);
1546
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
1405
if(ret == -1){
1549
1406
perror_plus("setenv");
1550
_exit(EX_OSERR);
1407
return false;
1551
1408
}
1552
1409
ret = setenv("DEVICE", interface, 1);
1553
1410
if(ret == -1){
1554
1411
perror_plus("setenv");
1555
_exit(EX_OSERR);
1412
return false;
1556
1413
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1558
1415
if(ret == -1){
1559
1416
perror_plus("setenv");
1560
_exit(EX_OSERR);
1417
return false;
1561
1418
}
1562
1419
ret = setenv("MODE", mode, 1);
1563
1420
if(ret == -1){
1564
1421
perror_plus("setenv");
1565
_exit(EX_OSERR);
1422
return false;
1566
1423
}
1567
1424
char *delaystring;
1568
1425
ret = asprintf(&delaystring, "%f", delay);
1569
1426
if(ret == -1){
1570
1427
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1428
return false;
1572
1429
}
1573
1430
ret = setenv("DELAY", delaystring, 1);
1574
1431
if(ret == -1){
1575
1432
free(delaystring);
1576
1433
perror_plus("setenv");
1577
_exit(EX_OSERR);
1434
return false;
1578
1435
}
1579
1436
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
}
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1591
1439
} else {
1592
1440
int status;
1593
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1617
1465
}
1618
1466
}
1619
1467
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1468
if(quit_now){
1469
break;
1623
1470
}
1624
1471
}
1625
1472
close(devnull);
1627
1474
return true;
1628
1475
}
1629
1476
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
1477
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
1478
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
1479
int error;
1807
1480
int ret;
1808
1481
intmax_t tmpmax;
1809
1482
char *tmp;
1810
1483
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1813
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1814
1491
bool tempdir_created = false;
1815
1492
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
1493
const char *seckey = PATHDIR "/" SECKEY;
1817
1494
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
1495
1820
1496
bool gnutls_initialized = false;
1821
1497
bool gpgme_initialized = false;
1883
1559
.group = 2 },
1884
1560
{ .name = "retry", .key = 132,
1885
1561
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1887
1563
.group = 2 },
1888
1564
{ .name = "network-hook-dir", .key = 133,
1889
1565
.arg = "DIR",
1912
1588
connect_to = arg;
1913
1589
break;
1914
1590
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
}
1591
interface = arg;
1920
1592
break;
1921
1593
case 's': /* --seckey */
1922
1594
seckey = arg;
1965
1637
argp_state_help(state, state->out_stream,
1966
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1968
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
1643
exit(argp_err_exit_status);
1970
1644
break;
1998
1672
{
1999
1673
/* Work around Debian bug #633582:
2000
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
2001
1676
2002
1677
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* 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;
2066
}
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2067
1731
}
2068
1732
}
2069
1733
2070
1734
/* Run network hooks */
2071
1735
{
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)',');
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
2080
1741
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
1742
if(not run_network_hooks("start", interface, delay)){
2083
1743
goto end;
2084
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2085
1751
}
2086
1752
2087
1753
if(not debug){
2088
1754
avahi_set_log_function(empty_log);
2089
1755
}
2090
1756
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
2091
1789
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
1790
from the signal handler */
2093
1791
/* Initialize the pseudo-RNG for Avahi */
2094
1792
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2097
1795
fprintf_plus(stderr,
2098
1796
"Avahi: Failed to create simple poll object.\n");
2099
1797
exitcode = EX_UNAVAILABLE;
2163
1861
}
2164
1862
}
2165
1863
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;
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2213
1949
}
2214
1950
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
2215
1968
break;
2216
1969
}
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);
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2246
1999
}
2247
2000
2248
2001
if(quit_now){
2249
2002
goto end;
2250
2003
}
2251
2004
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2005
ret = init_gnutls_global(pubkey, seckey);
2253
2006
if(ret == -1){
2254
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
2008
exitcode = EX_UNAVAILABLE;
2272
2025
goto end;
2273
2026
}
2274
2027
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2276
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2277
2030
exitcode = EX_UNAVAILABLE;
2278
2031
goto end;
2288
2041
/* Connect directly, do not use Zeroconf */
2289
2042
/* (Mainly meant for debugging) */
2290
2043
char *address = strrchr(connect_to, ':');
2291
2292
2044
if(address == NULL){
2293
2045
fprintf_plus(stderr, "No colon in address\n");
2294
2046
exitcode = EX_USAGE;
2299
2051
goto end;
2300
2052
}
2301
2053
2302
in_port_t port;
2054
uint16_t port;
2303
2055
errno = 0;
2304
2056
tmpmax = strtoimax(address+1, &tmp, 10);
2305
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2058
or tmpmax != (uint16_t)tmpmax){
2307
2059
fprintf_plus(stderr, "Bad port number\n");
2308
2060
exitcode = EX_USAGE;
2309
2061
goto end;
2310
2062
}
2311
2063
2312
2064
if(quit_now){
2313
2065
goto end;
2314
2066
}
2315
2067
2316
port = (in_port_t)tmpmax;
2068
port = (uint16_t)tmpmax;
2317
2069
*address = '\0';
2318
2070
/* Colon in address indicates IPv6 */
2319
2071
int af;
2335
2087
}
2336
2088
2337
2089
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2090
ret = start_mandos_communication(address, port, if_index, af);
2340
2091
if(quit_now or ret == 0){
2341
2092
break;
2342
2093
}
2344
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
2096
(int)retry_interval);
2346
2097
}
2347
sleep((unsigned int)retry_interval);
2098
sleep((int)retry_interval);
2348
2099
}
2349
2100
2350
2101
if (not quit_now){
2368
2119
config.publish_domain = 0;
2369
2120
2370
2121
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2373
2125
2374
2126
/* Free the Avahi configuration data */
2375
2127
avahi_server_config_free(&config);
2378
2130
/* Check if creating the Avahi server object succeeded */
2379
2131
if(mc.server == NULL){
2380
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2133
avahi_strerror(error));
2382
2134
exitcode = EX_UNAVAILABLE;
2383
2135
goto end;
2384
2136
}
2390
2142
/* Create the Avahi service browser */
2391
2143
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2145
NULL, 0, browse_callback, NULL);
2395
2146
if(sb == NULL){
2396
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
2148
avahi_strerror(avahi_server_errno(mc.server)));
2409
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
2161
}
2411
2162
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2414
2165
if(debug){
2415
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
2167
(ret == 0) ? "successfully" : "with error");
2423
2174
}
2424
2175
2425
2176
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
2177
if(sb != NULL)
2429
2178
avahi_s_service_browser_free(sb);
2430
2179
2431
2180
if(mc.server != NULL)
2432
2181
avahi_server_free(mc.server);
2433
2182
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2436
2185
2437
2186
if(gnutls_initialized){
2438
2187
gnutls_certificate_free_credentials(mc.cred);
2443
2192
if(gpgme_initialized){
2444
2193
gpgme_release(mc.ctx);
2445
2194
}
2446
2195
2447
2196
/* Cleans up the circular linked list of Mandos servers the client
2448
2197
has seen */
2449
2198
if(mc.current_server != NULL){
2457
2206
2458
2207
/* Re-raise priviliges */
2459
2208
{
2460
raise_privileges();
2461
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2462
2214
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2465
2218
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");
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2476
2229
}
2477
2230
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2481
2234
}
2482
2235
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2489
2243
2490
2244
/* Removes the GPGME temp directory and all files inside */
2491
2245
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0