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- Committer: Teddy Hogeborn
- Date: 2012-05-06 17:23:08 UTC
- Revision ID: teddy@recompile.se-20120506172308-xw7368koksmjmnv3
* mandos (Client.start_checker): Reworded comment.
(MandosServer.handle_ipc): Removed dead code.
(MandosServer.handle_ipc): Removed dead code.
- files removed:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
91
98
92
#ifdef __linux__
99
93
#include <sys/klog.h> /* klogctl() */
141
135
static const char sys_class_net[] = "/sys/class/net";
142
136
char *connect_to = NULL;
143
137
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
138
147
139
/* Doubly linked list that need to be circularly linked when used */
148
140
typedef struct server{
149
141
const char *ip;
150
in_port_t port;
142
uint16_t port;
151
143
AvahiIfIndex if_index;
152
144
int af;
153
145
struct timespec last_seen;
157
149
158
150
/* Used for passing in values through the Avahi callback functions */
159
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
160
153
AvahiServer *server;
161
154
gnutls_certificate_credentials_t cred;
162
155
unsigned int dh_bits;
164
157
const char *priority;
165
158
gpgme_ctx_t ctx;
166
159
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
160
} mandos_context;
170
161
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
167
174
168
sig_atomic_t quit_now = 0;
175
169
int signal_received = 0;
190
184
191
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
186
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
188
}
195
189
196
190
/*
201
195
size_t incbuffer(char **buffer, size_t buffer_length,
202
196
size_t buffer_capacity){
203
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
210
200
return 0;
211
201
}
212
*buffer = new_buf;
213
202
buffer_capacity += BUFFER_SIZE;
214
203
}
215
204
return buffer_capacity;
216
205
}
217
206
218
207
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
221
210
int ret;
222
211
server *new_server = malloc(sizeof(server));
223
212
if(new_server == NULL){
232
221
perror_plus("strdup");
233
222
return false;
234
223
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
224
/* Special case of first server */
241
if(*current_server == NULL){
225
if (mc.current_server == NULL){
242
226
new_server->next = new_server;
243
227
new_server->prev = new_server;
244
*current_server = new_server;
228
mc.current_server = new_server;
245
229
/* Place the new server last in the list */
246
230
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
249
233
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
251
240
}
252
241
return true;
253
242
}
256
245
* Initialize GPGME.
257
246
*/
258
247
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
248
const char *tempdir){
260
249
gpgme_error_t rc;
261
250
gpgme_engine_info_t engine_info;
262
251
252
263
253
/*
264
254
* Helper function to insert pub and seckey to the engine keyring.
265
255
*/
281
271
return false;
282
272
}
283
273
284
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
285
275
if(rc != GPG_ERR_NO_ERROR){
286
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
277
gpgme_strsource(rc), gpgme_strerror(rc));
331
321
}
332
322
333
323
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
335
325
if(rc != GPG_ERR_NO_ERROR){
336
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
342
*/
353
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
344
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
345
char **plaintext){
357
346
gpgme_data_t dh_crypto, dh_plain;
358
347
gpgme_error_t rc;
359
348
ssize_t ret;
385
374
386
375
/* Decrypt data from the cryptotext data buffer to the plaintext
387
376
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
378
if(rc != GPG_ERR_NO_ERROR){
390
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
380
gpgme_strsource(rc), gpgme_strerror(rc));
392
381
plaintext_length = -1;
393
382
if(debug){
394
383
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
396
385
if(result == NULL){
397
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
387
} else {
476
465
}
477
466
478
467
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
480
470
if(ret == NULL)
481
471
ret = "(unknown)";
482
472
return ret;
489
479
}
490
480
491
481
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
482
const char *seckeyfilename){
494
483
int ret;
495
484
496
485
if(debug){
513
502
}
514
503
515
504
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
506
if(ret != GNUTLS_E_SUCCESS){
518
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
508
safer_gnutls_strerror(ret));
529
518
}
530
519
531
520
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
533
522
GNUTLS_OPENPGP_FMT_BASE64);
534
523
if(ret != GNUTLS_E_SUCCESS){
535
524
fprintf_plus(stderr,
541
530
}
542
531
543
532
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
545
534
if(ret != GNUTLS_E_SUCCESS){
546
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
536
" initialization: %s\n",
548
537
safer_gnutls_strerror(ret));
549
538
goto globalfail;
550
539
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
541
if(ret != GNUTLS_E_SUCCESS){
553
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
543
safer_gnutls_strerror(ret));
555
544
goto globalfail;
556
545
}
557
546
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
548
560
549
return 0;
561
550
562
551
globalfail:
563
552
564
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
565
554
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
567
556
return -1;
568
557
}
569
558
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
572
560
int ret;
573
561
/* GnuTLS session creation */
574
562
do {
586
574
{
587
575
const char *err;
588
576
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
578
if(quit_now){
591
579
gnutls_deinit(*session);
592
580
return -1;
603
591
604
592
do {
605
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
594
mc.cred);
607
595
if(quit_now){
608
596
gnutls_deinit(*session);
609
597
return -1;
619
607
/* ignore client certificate if any. */
620
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
609
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
611
624
612
return 0;
625
613
}
629
617
__attribute__((unused)) const char *txt){}
630
618
631
619
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
633
621
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
622
int af){
635
623
int ret, tcp_sd = -1;
636
624
ssize_t sret;
637
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
638
629
char *buffer = NULL;
639
630
char *decrypted_buffer = NULL;
640
631
size_t buffer_length = 0;
664
655
return -1;
665
656
}
666
657
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
700
659
if(ret != 0){
701
660
return -1;
702
661
}
703
662
704
663
if(debug){
705
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
707
666
}
708
667
709
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
721
680
722
681
memset(&to, 0, sizeof(to));
723
682
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
685
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
729
688
}
730
689
if(ret < 0 ){
731
690
int e = errno;
740
699
goto mandos_end;
741
700
}
742
701
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
746
709
if(if_index == AVAHI_IF_UNSPEC){
747
710
fprintf_plus(stderr, "An IPv6 link-local address is"
748
711
" incomplete without a network interface\n");
750
713
goto mandos_end;
751
714
}
752
715
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
754
717
}
755
718
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
757
722
}
758
723
759
724
if(quit_now){
767
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
733
perror_plus("if_indextoname");
769
734
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
772
737
}
773
738
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
776
741
}
777
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
779
745
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
784
748
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
789
751
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
796
758
}
797
759
}
798
760
802
764
}
803
765
804
766
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
807
768
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
810
770
}
811
771
if(ret < 0){
812
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
773
int e = errno;
814
774
perror_plus("connect");
815
775
errno = e;
861
821
goto mandos_end;
862
822
}
863
823
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
869
826
870
827
if(quit_now){
871
828
errno = EINTR;
976
933
if(buffer_length > 0){
977
934
ssize_t decrypted_buffer_size;
978
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
936
&decrypted_buffer);
980
937
if(decrypted_buffer_size >= 0){
981
938
982
939
written = 0;
1043
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
1002
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1050
1005
1051
1006
/* Called whenever a service has been resolved successfully or
1052
1007
timed out */
1061
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
1018
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
1019
avahi_strerror(avahi_server_errno(mc.server)));
1066
1020
break;
1067
1021
1068
1022
case AVAHI_RESOLVER_FOUND:
1074
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
1029
host_name, ip, (intmax_t)interface, port);
1076
1030
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1081
1033
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1034
avahi_simple_poll_quit(mc.simple_poll);
1083
1035
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1087
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
1039
" list\n", name);
1089
1040
}
1102
1053
const char *domain,
1103
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1055
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1109
1058
1110
1059
/* Called whenever a new services becomes available on the LAN or
1111
1060
is removed from the LAN */
1119
1068
case AVAHI_BROWSER_FAILURE:
1120
1069
1121
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1125
1073
return;
1126
1074
1127
1075
case AVAHI_BROWSER_NEW:
1130
1078
the callback function is called the Avahi server will free the
1131
1079
resolver for us. */
1132
1080
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1137
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
1085
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1086
avahi_strerror(avahi_server_errno(mc.server)));
1141
1087
break;
1142
1088
1143
1089
case AVAHI_BROWSER_REMOVE:
1162
1108
signal_received = sig;
1163
1109
int old_errno = errno;
1164
1110
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1167
1113
}
1168
1114
errno = old_errno;
1169
1115
}
1170
1116
1171
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1118
int ret;
1173
error_t ret_errno;
1174
1119
1175
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1121
if(s < 0){
1177
ret_errno = errno;
1178
1122
perror_plus("socket");
1179
errno = ret_errno;
1180
1123
return false;
1181
1124
}
1182
1125
strcpy(ifr->ifr_name, ifname);
1183
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1127
if(ret == -1){
1185
1128
if(debug){
1186
ret_errno = errno;
1187
1129
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
1130
}
1190
1131
return false;
1191
1132
}
1260
1201
}
1261
1202
1262
1203
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1292
1244
}
1293
1245
1294
1246
int notdotentries(const struct dirent *direntry){
1363
1315
return 1;
1364
1316
}
1365
1317
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
1319
int ret;
1369
1320
struct timespec now;
1370
1321
struct timespec waited_time;
1371
1322
intmax_t block_time;
1372
1323
1373
1324
while(true){
1374
if(mc->current_server == NULL){
1375
if(debug){
1325
if(mc.current_server == NULL){
1326
if (debug){
1376
1327
fprintf_plus(stderr, "Wait until first server is found."
1377
1328
" No timeout!\n");
1378
1329
}
1379
1330
ret = avahi_simple_poll_iterate(s, -1);
1380
1331
} else {
1381
if(debug){
1332
if (debug){
1382
1333
fprintf_plus(stderr, "Check current_server if we should run"
1383
1334
" it, or wait\n");
1384
1335
}
1391
1342
/* Calculating in ms how long time between now and server
1392
1343
who we visted longest time ago. Now - last seen. */
1393
1344
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1345
- mc.current_server->last_seen.tv_sec);
1395
1346
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1347
- mc.current_server->last_seen.tv_nsec);
1397
1348
/* total time is 10s/10,000ms.
1398
1349
Converting to s from ms by dividing by 1,000,
1399
1350
and ns to ms by dividing by 1,000,000. */
1401
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1402
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1403
1354
1404
if(debug){
1355
if (debug){
1405
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
1357
block_time);
1407
1358
}
1408
1359
1409
1360
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1414
1365
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1366
avahi_simple_poll_quit(mc.simple_poll);
1416
1367
return 0;
1417
1368
}
1418
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1370
&mc.current_server->last_seen);
1420
1371
if(ret == -1){
1421
1372
perror_plus("clock_gettime");
1422
1373
return -1;
1423
1374
}
1424
mc->current_server = mc->current_server->next;
1375
mc.current_server = mc.current_server->next;
1425
1376
block_time = 0; /* Call avahi to find new Mandos
1426
1377
servers, but don't block */
1427
1378
}
1429
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1430
1381
}
1431
1382
if(ret != 0){
1432
if(ret > 0 or errno != EINTR){
1383
if (ret > 0 or errno != EINTR){
1433
1384
return (ret != 1) ? ret : 0;
1434
1385
}
1435
1386
}
1436
1387
}
1437
1388
}
1438
1389
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
1390
bool run_network_hooks(const char *mode, const char *interface,
1492
1391
const float delay){
1493
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1494
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
1396
alphasort);
1496
1397
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1398
perror_plus("scandir");
1505
1399
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
1400
int devnull = open("/dev/null", O_RDONLY);
1509
1401
for(int i = 0; i < numhooks; i++){
1510
1402
direntry = direntries[i];
1522
1414
if(hook_pid == 0){
1523
1415
/* Child */
1524
1416
/* Raise privileges */
1525
raise_privileges_permanently();
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1526
1428
/* Set group */
1527
1429
errno = 0;
1528
1430
ret = setgid(0);
1621
1523
return true;
1622
1524
}
1623
1525
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1794
1526
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
1527
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1528
int error;
1801
1529
int ret;
1802
1530
intmax_t tmpmax;
1803
1531
char *tmp;
1804
1532
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1807
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1808
1540
bool tempdir_created = false;
1809
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
1542
const char *seckey = PATHDIR "/" SECKEY;
1811
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1544
1814
1545
bool gnutls_initialized = false;
1815
1546
bool gpgme_initialized = false;
1906
1637
connect_to = arg;
1907
1638
break;
1908
1639
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1640
interface = arg;
1914
1641
break;
1915
1642
case 's': /* --seckey */
1916
1643
seckey = arg;
1994
1721
<http://bugs.debian.org/633582> */
1995
1722
1996
1723
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1998
1729
struct stat st;
1999
1730
2000
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2040
1771
}
2041
1772
2042
1773
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2060
1778
}
2061
1779
}
2062
1780
}
2063
1781
2064
1782
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2079
1785
}
2080
1786
2081
1787
if(not debug){
2082
1788
avahi_set_log_function(empty_log);
2083
1789
}
2084
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
2085
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2086
1824
from the signal handler */
2087
1825
/* Initialize the pseudo-RNG for Avahi */
2088
1826
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2091
1829
fprintf_plus(stderr,
2092
1830
"Avahi: Failed to create simple poll object.\n");
2093
1831
exitcode = EX_UNAVAILABLE;
2157
1895
}
2158
1896
}
2159
1897
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2207
1983
}
2208
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2209
2002
break;
2210
2003
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2240
2033
}
2241
2034
2242
2035
if(quit_now){
2243
2036
goto end;
2244
2037
}
2245
2038
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2039
ret = init_gnutls_global(pubkey, seckey);
2247
2040
if(ret == -1){
2248
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
2042
exitcode = EX_UNAVAILABLE;
2266
2059
goto end;
2267
2060
}
2268
2061
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2270
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2271
2064
exitcode = EX_UNAVAILABLE;
2272
2065
goto end;
2282
2075
/* Connect directly, do not use Zeroconf */
2283
2076
/* (Mainly meant for debugging) */
2284
2077
char *address = strrchr(connect_to, ':');
2285
2286
2078
if(address == NULL){
2287
2079
fprintf_plus(stderr, "No colon in address\n");
2288
2080
exitcode = EX_USAGE;
2293
2085
goto end;
2294
2086
}
2295
2087
2296
in_port_t port;
2088
uint16_t port;
2297
2089
errno = 0;
2298
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2299
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2092
or tmpmax != (uint16_t)tmpmax){
2301
2093
fprintf_plus(stderr, "Bad port number\n");
2302
2094
exitcode = EX_USAGE;
2303
2095
goto end;
2304
2096
}
2305
2097
2306
2098
if(quit_now){
2307
2099
goto end;
2308
2100
}
2309
2101
2310
port = (in_port_t)tmpmax;
2102
port = (uint16_t)tmpmax;
2311
2103
*address = '\0';
2312
2104
/* Colon in address indicates IPv6 */
2313
2105
int af;
2329
2121
}
2330
2122
2331
2123
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2124
ret = start_mandos_communication(address, port, if_index, af);
2334
2125
if(quit_now or ret == 0){
2335
2126
break;
2336
2127
}
2338
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
2130
(int)retry_interval);
2340
2131
}
2341
sleep((unsigned int)retry_interval);
2132
sleep((int)retry_interval);
2342
2133
}
2343
2134
2344
if(not quit_now){
2135
if (not quit_now){
2345
2136
exitcode = EXIT_SUCCESS;
2346
2137
}
2347
2138
2362
2153
config.publish_domain = 0;
2363
2154
2364
2155
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2367
2159
2368
2160
/* Free the Avahi configuration data */
2369
2161
avahi_server_config_free(&config);
2372
2164
/* Check if creating the Avahi server object succeeded */
2373
2165
if(mc.server == NULL){
2374
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2167
avahi_strerror(error));
2376
2168
exitcode = EX_UNAVAILABLE;
2377
2169
goto end;
2378
2170
}
2384
2176
/* Create the Avahi service browser */
2385
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2179
NULL, 0, browse_callback, NULL);
2389
2180
if(sb == NULL){
2390
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
2182
avahi_strerror(avahi_server_errno(mc.server)));
2403
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
2195
}
2405
2196
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2408
2199
if(debug){
2409
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
2201
(ret == 0) ? "successfully" : "with error");
2417
2208
}
2418
2209
2419
2210
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
2211
if(sb != NULL)
2423
2212
avahi_s_service_browser_free(sb);
2424
2213
2425
2214
if(mc.server != NULL)
2426
2215
avahi_server_free(mc.server);
2427
2216
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2430
2219
2431
2220
if(gnutls_initialized){
2432
2221
gnutls_certificate_free_credentials(mc.cred);
2449
2238
}
2450
2239
}
2451
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2452
2244
/* Re-raise priviliges */
2453
2245
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2470
2262
}
2471
2263
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2475
2267
}
2476
2268
}
2477
2478
lower_privileges_permanently();
2479
}
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2483
2276
2484
2277
/* Removes the GPGME temp directory and all files inside */
2485
2278
if(tempdir_created){
2487
2280
struct dirent *direntry = NULL;
2488
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
2282
alphasort);
2490
if(numentries > 0){
2283
if (numentries > 0){
2491
2284
for(int i = 0; i < numentries; i++){
2492
2285
direntry = direntries[i];
2493
2286
char *fullname = NULL;
2508
2301
2509
2302
/* need to clean even if 0 because man page doesn't specify */
2510
2303
free(direntries);
2511
if(numentries == -1){
2304
if (numentries == -1){
2512
2305
perror_plus("scandir");
2513
2306
}
2514
2307
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0