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- Committer: Teddy Hogeborn
- Date: 2014-05-11 20:18:48 UTC
- mto: This revision was merged to the branch mainline in revision 682.
- Revision ID: teddy@recompile.se-20140511201848-blw9pl5c76upkhdc
Tags: version-1.6.5-1
* Makefile (version): Changed to "1.6.5".
* NEWS (Version 1.6.5): New entry.
* debian/changelog (1.6.5-1): - '' -
* NEWS (Version 1.6.5): New entry.
* debian/changelog (1.6.5-1): - '' -
- files added:
- debian/upstream
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
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, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
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,
92
92
argz_delete(), argz_append(),
93
93
argz_stringify(), argz_add(),
94
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
95
97
96
98
#ifdef __linux__
97
99
#include <sys/klog.h> /* klogctl() */
145
147
/* Doubly linked list that need to be circularly linked when used */
146
148
typedef struct server{
147
149
const char *ip;
148
uint16_t port;
150
in_port_t port;
149
151
AvahiIfIndex if_index;
150
152
int af;
151
153
struct timespec last_seen;
155
157
156
158
/* Used for passing in values through the Avahi callback functions */
157
159
typedef struct {
158
AvahiSimplePoll *simple_poll;
159
160
AvahiServer *server;
160
161
gnutls_certificate_credentials_t cred;
161
162
unsigned int dh_bits;
163
164
const char *priority;
164
165
gpgme_ctx_t ctx;
165
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
166
169
} mandos_context;
167
170
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
173
174
174
sig_atomic_t quit_now = 0;
175
175
int signal_received = 0;
183
183
perror(print_text);
184
184
}
185
185
186
__attribute__((format (gnu_printf, 2, 3)))
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
188
va_list ap;
189
189
va_start (ap, format);
190
190
191
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
194
}
195
195
196
196
/*
198
198
* bytes. "buffer_capacity" is how much is currently allocated,
199
199
* "buffer_length" is how much is already used.
200
200
*/
201
__attribute__((nonnull, warn_unused_result))
201
202
size_t incbuffer(char **buffer, size_t buffer_length,
202
203
size_t buffer_capacity){
203
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
206
211
return 0;
207
212
}
213
*buffer = new_buf;
208
214
buffer_capacity += BUFFER_SIZE;
209
215
}
210
216
return buffer_capacity;
211
217
}
212
218
213
219
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
216
223
int ret;
217
224
server *new_server = malloc(sizeof(server));
218
225
if(new_server == NULL){
227
234
perror_plus("strdup");
228
235
return false;
229
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
230
242
/* Special case of first server */
231
if (mc.current_server == NULL){
243
if(*current_server == NULL){
232
244
new_server->next = new_server;
233
245
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
246
*current_server = new_server;
236
247
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
239
251
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
252
(*current_server)->prev = new_server;
246
253
}
247
254
return true;
248
255
}
250
257
/*
251
258
* Initialize GPGME.
252
259
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
255
265
gpgme_error_t rc;
256
266
gpgme_engine_info_t engine_info;
257
267
258
259
268
/*
260
269
* Helper function to insert pub and seckey to the engine keyring.
261
270
*/
262
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
263
272
int ret;
264
273
int fd;
265
274
gpgme_data_t pgp_data;
277
286
return false;
278
287
}
279
288
280
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
281
290
if(rc != GPG_ERR_NO_ERROR){
282
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
292
gpgme_strsource(rc), gpgme_strerror(rc));
327
336
}
328
337
329
338
/* Create new GPGME "context" */
330
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
331
340
if(rc != GPG_ERR_NO_ERROR){
332
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
346
355
* Decrypt OpenPGP data.
347
356
* Returns -1 on error
348
357
*/
358
__attribute__((nonnull, warn_unused_result))
349
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
350
360
size_t crypto_size,
351
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
352
363
gpgme_data_t dh_crypto, dh_plain;
353
364
gpgme_error_t rc;
354
365
ssize_t ret;
380
391
381
392
/* Decrypt data from the cryptotext data buffer to the plaintext
382
393
data buffer */
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
384
395
if(rc != GPG_ERR_NO_ERROR){
385
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
397
gpgme_strsource(rc), gpgme_strerror(rc));
387
398
plaintext_length = -1;
388
399
if(debug){
389
400
gpgme_decrypt_result_t result;
390
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
391
402
if(result == NULL){
392
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
404
} else {
470
481
return plaintext_length;
471
482
}
472
483
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
476
487
if(ret == NULL)
477
488
ret = "(unknown)";
478
489
return ret;
479
490
}
480
491
481
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
482
494
static void debuggnutls(__attribute__((unused)) int level,
483
495
const char* string){
484
496
fprintf_plus(stderr, "GnuTLS: %s", string);
485
497
}
486
498
499
__attribute__((nonnull, warn_unused_result))
487
500
static int init_gnutls_global(const char *pubkeyfilename,
488
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
489
503
int ret;
490
504
491
505
if(debug){
508
522
}
509
523
510
524
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
512
526
if(ret != GNUTLS_E_SUCCESS){
513
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
528
safer_gnutls_strerror(ret));
524
538
}
525
539
526
540
ret = gnutls_certificate_set_openpgp_key_file
527
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
528
542
GNUTLS_OPENPGP_FMT_BASE64);
529
543
if(ret != GNUTLS_E_SUCCESS){
530
544
fprintf_plus(stderr,
536
550
}
537
551
538
552
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
540
554
if(ret != GNUTLS_E_SUCCESS){
541
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
556
" initialization: %s\n",
543
557
safer_gnutls_strerror(ret));
544
558
goto globalfail;
545
559
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
561
if(ret != GNUTLS_E_SUCCESS){
548
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
563
safer_gnutls_strerror(ret));
550
564
goto globalfail;
551
565
}
552
566
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
568
555
569
return 0;
556
570
557
571
globalfail:
558
572
559
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
560
574
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
562
576
return -1;
563
577
}
564
578
565
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
566
582
int ret;
567
583
/* GnuTLS session creation */
568
584
do {
580
596
{
581
597
const char *err;
582
598
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
600
if(quit_now){
585
601
gnutls_deinit(*session);
586
602
return -1;
597
613
598
614
do {
599
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
mc.cred);
616
mc->cred);
601
617
if(quit_now){
602
618
gnutls_deinit(*session);
603
619
return -1;
613
629
/* ignore client certificate if any. */
614
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
615
631
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
617
633
618
634
return 0;
619
635
}
623
639
__attribute__((unused)) const char *txt){}
624
640
625
641
/* Called when a Mandos server is found */
626
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
627
644
AvahiIfIndex if_index,
628
int af){
645
int af, mandos_context *mc){
629
646
int ret, tcp_sd = -1;
630
647
ssize_t sret;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
648
struct sockaddr_storage to;
635
649
char *buffer = NULL;
636
650
char *decrypted_buffer = NULL;
637
651
size_t buffer_length = 0;
661
675
return -1;
662
676
}
663
677
664
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
665
711
if(ret != 0){
666
712
return -1;
667
713
}
668
714
669
715
if(debug){
670
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
717
PRIuMAX "\n", ip, (uintmax_t)port);
672
718
}
673
719
674
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
686
732
687
733
memset(&to, 0, sizeof(to));
688
734
if(af == AF_INET6){
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
691
737
} else { /* IPv4 */
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
694
740
}
695
741
if(ret < 0 ){
696
742
int e = errno;
705
751
goto mandos_end;
706
752
}
707
753
if(af == AF_INET6){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
715
757
if(if_index == AVAHI_IF_UNSPEC){
716
758
fprintf_plus(stderr, "An IPv6 link-local address is"
717
759
" incomplete without a network interface\n");
719
761
goto mandos_end;
720
762
}
721
763
/* Set the network interface number as scope */
722
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
723
765
}
724
766
} else {
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
728
768
}
729
769
730
770
if(quit_now){
738
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
779
perror_plus("if_indextoname");
740
780
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
743
783
}
744
784
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
747
787
}
748
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
const char *pcret;
751
790
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
754
795
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
757
800
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
760
} else {
761
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
764
807
}
765
808
}
766
809
770
813
}
771
814
772
815
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
774
818
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
776
821
}
777
822
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
824
int e = errno;
780
825
perror_plus("connect");
781
826
errno = e;
942
987
if(buffer_length > 0){
943
988
ssize_t decrypted_buffer_size;
944
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
945
&decrypted_buffer);
990
&decrypted_buffer, mc);
946
991
if(decrypted_buffer_size >= 0){
947
992
948
993
written = 0;
996
1041
return retval;
997
1042
}
998
1043
1044
__attribute__((nonnull))
999
1045
static void resolve_callback(AvahiSServiceResolver *r,
1000
1046
AvahiIfIndex interface,
1001
1047
AvahiProtocol proto,
1009
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
1010
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1011
1057
flags,
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1014
1062
1015
1063
/* Called whenever a service has been resolved successfully or
1016
1064
timed out */
1025
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
1075
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1029
1078
break;
1030
1079
1031
1080
case AVAHI_RESOLVER_FOUND:
1037
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
1087
host_name, ip, (intmax_t)interface, port);
1039
1088
}
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1042
1093
if(ret == 0){
1043
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1044
1095
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1047
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
1100
" list\n", name);
1049
1101
}
1062
1114
const char *domain,
1063
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1064
1116
flags,
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1067
1121
1068
1122
/* Called whenever a new services becomes available on the LAN or
1069
1123
is removed from the LAN */
1077
1131
case AVAHI_BROWSER_FAILURE:
1078
1132
1079
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1082
1137
return;
1083
1138
1084
1139
case AVAHI_BROWSER_NEW:
1087
1142
the callback function is called the Avahi server will free the
1088
1143
resolver for us. */
1089
1144
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1093
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1150
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1096
1153
break;
1097
1154
1098
1155
case AVAHI_BROWSER_REMOVE:
1117
1174
signal_received = sig;
1118
1175
int old_errno = errno;
1119
1176
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1122
1179
}
1123
1180
errno = old_errno;
1124
1181
}
1125
1182
1183
__attribute__((nonnull, warn_unused_result))
1126
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1185
int ret;
1128
1186
error_t ret_errno;
1147
1205
return true;
1148
1206
}
1149
1207
1208
__attribute__((nonnull, warn_unused_result))
1150
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1210
1152
1211
/* Reject the loopback device */
1194
1253
* corresponds to an acceptable network device.
1195
1254
* (This function is passed to scandir(3) as a filter function.)
1196
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1197
1257
int good_interface(const struct dirent *if_entry){
1198
1258
if(if_entry->d_name[0] == '.'){
1199
1259
return 0;
1217
1277
/*
1218
1278
* This function determines if a network interface is up.
1219
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1220
1281
bool interface_is_up(const char *interface){
1221
1282
struct ifreq ifr;
1222
1283
if(not get_flags(interface, &ifr)){
1233
1294
/*
1234
1295
* This function determines if a network interface is running
1235
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1236
1298
bool interface_is_running(const char *interface){
1237
1299
struct ifreq ifr;
1238
1300
if(not get_flags(interface, &ifr)){
1246
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1309
}
1248
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1249
1312
int notdotentries(const struct dirent *direntry){
1250
1313
/* Skip "." and ".." */
1251
1314
if(direntry->d_name[0] == '.'
1258
1321
}
1259
1322
1260
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1261
1325
int runnable_hook(const struct dirent *direntry){
1262
1326
int ret;
1263
1327
size_t sret;
1318
1382
return 1;
1319
1383
}
1320
1384
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1322
1388
int ret;
1323
1389
struct timespec now;
1324
1390
struct timespec waited_time;
1325
1391
intmax_t block_time;
1326
1392
1327
1393
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1394
if(mc->current_server == NULL){
1395
if(debug){
1330
1396
fprintf_plus(stderr, "Wait until first server is found."
1331
1397
" No timeout!\n");
1332
1398
}
1333
1399
ret = avahi_simple_poll_iterate(s, -1);
1334
1400
} else {
1335
if (debug){
1401
if(debug){
1336
1402
fprintf_plus(stderr, "Check current_server if we should run"
1337
1403
" it, or wait\n");
1338
1404
}
1345
1411
/* Calculating in ms how long time between now and server
1346
1412
who we visted longest time ago. Now - last seen. */
1347
1413
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1349
1415
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1351
1417
/* total time is 10s/10,000ms.
1352
1418
Converting to s from ms by dividing by 1,000,
1353
1419
and ns to ms by dividing by 1,000,000. */
1355
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1423
1358
if (debug){
1424
if(debug){
1359
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1426
block_time);
1361
1427
}
1362
1428
1363
1429
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1368
1434
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1370
1436
return 0;
1371
1437
}
1372
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1374
1440
if(ret == -1){
1375
1441
perror_plus("clock_gettime");
1376
1442
return -1;
1377
1443
}
1378
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1379
1445
block_time = 0; /* Call avahi to find new Mandos
1380
1446
servers, but don't block */
1381
1447
}
1383
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1450
}
1385
1451
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1387
1453
return (ret != 1) ? ret : 0;
1388
1454
}
1389
1455
}
1391
1457
}
1392
1458
1393
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1394
1461
error_t raise_privileges(void){
1395
1462
error_t old_errno = errno;
1396
1463
error_t ret_errno = 0;
1403
1470
}
1404
1471
1405
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1406
1474
error_t raise_privileges_permanently(void){
1407
1475
error_t old_errno = errno;
1408
1476
error_t ret_errno = raise_privileges();
1419
1487
}
1420
1488
1421
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1422
1491
error_t lower_privileges(void){
1423
1492
error_t old_errno = errno;
1424
1493
error_t ret_errno = 0;
1431
1500
}
1432
1501
1433
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1434
1504
error_t lower_privileges_permanently(void){
1435
1505
error_t old_errno = errno;
1436
1506
error_t ret_errno = 0;
1442
1512
return ret_errno;
1443
1513
}
1444
1514
1445
bool run_network_hooks(const char *mode, const char *interface,
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1446
1517
const float delay){
1447
1518
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
1520
alphasort);
1452
1521
if(numhooks == -1){
1453
perror_plus("scandir");
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1454
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1455
1533
int devnull = open("/dev/null", O_RDONLY);
1456
1534
for(int i = 0; i < numhooks; i++){
1457
1535
direntry = direntries[i];
1469
1547
if(hook_pid == 0){
1470
1548
/* Child */
1471
1549
/* Raise privileges */
1472
raise_privileges_permanently();
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1473
1554
/* Set group */
1474
1555
errno = 0;
1475
1556
ret = setgid(0);
1476
1557
if(ret == -1){
1477
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1478
1560
}
1479
1561
/* Reset supplementary groups */
1480
1562
errno = 0;
1481
1563
ret = setgroups(0, NULL);
1482
1564
if(ret == -1){
1483
1565
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1488
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
1584
if(ret == -1){
1490
1585
perror_plus("setenv");
1506
1601
_exit(EX_OSERR);
1507
1602
}
1508
1603
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1510
1605
if(ret == -1){
1511
1606
perror_plus("asprintf");
1512
1607
_exit(EX_OSERR);
1565
1660
}
1566
1661
close(devnull);
1567
1662
}
1568
return true;
1569
1663
}
1570
1664
1665
__attribute__((nonnull, warn_unused_result))
1571
1666
error_t bring_up_interface(const char *const interface,
1572
1667
const float delay){
1573
int sd = -1;
1574
1668
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1669
int ret;
1577
1670
struct ifreq network;
1578
1671
unsigned int if_index = if_nametoindex(interface);
1579
1672
if(if_index == 0){
1588
1681
}
1589
1682
1590
1683
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1592
1686
ret_errno = errno;
1593
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1594
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1595
1690
return ret_errno;
1596
1691
}
1597
network.ifr_flags |= IFF_UP;
1692
network.ifr_flags |= IFF_UP; /* set flag */
1598
1693
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1601
1696
ret_errno = errno;
1602
1697
perror_plus("socket");
1603
1698
errno = old_errno;
1604
1699
return ret_errno;
1605
1700
}
1606
1701
1607
1702
if(quit_now){
1608
close(sd);
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1609
1707
errno = old_errno;
1610
1708
return EINTR;
1611
1709
}
1615
1713
interface);
1616
1714
}
1617
1715
1618
/* Raise priviliges */
1619
raise_privileges();
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1620
1721
1621
1722
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1629
1734
}
1630
1735
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1633
1738
#ifdef __linux__
1634
1739
if(restore_loglevel){
1635
1740
ret_linux = klogctl(7, NULL, 0);
1639
1744
}
1640
1745
#endif /* __linux__ */
1641
1746
1642
/* Lower privileges */
1643
lower_privileges();
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1644
1756
1645
1757
/* Close the socket */
1646
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1649
1761
}
1650
1762
1651
1763
if(ret_setflags == -1){
1652
errno = ret_errno;
1764
errno = ioctl_errno;
1653
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
1766
errno = old_errno;
1655
return ret_errno;
1767
return ioctl_errno;
1656
1768
}
1657
1769
} else if(debug){
1658
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1676
1788
return 0;
1677
1789
}
1678
1790
1791
__attribute__((nonnull, warn_unused_result))
1679
1792
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
1793
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
1794
struct ifreq network;
1685
1795
unsigned int if_index = if_nametoindex(interface);
1686
1796
if(if_index == 0){
1689
1799
return ENXIO;
1690
1800
}
1691
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1692
1803
if(not get_flags(interface, &network) and debug){
1693
1804
ret_errno = errno;
1694
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1695
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1696
1808
return ret_errno;
1697
1809
}
1698
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1811
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1702
1814
ret_errno = errno;
1703
1815
perror_plus("socket");
1704
1816
errno = old_errno;
1710
1822
interface);
1711
1823
}
1712
1824
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1721
1843
1722
1844
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
1846
if(ret == -1){
1725
1847
perror_plus("close");
1726
1848
}
1727
1849
1728
1850
if(ret_setflags == -1){
1729
errno = ret_errno;
1851
errno = ioctl_errno;
1730
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
1853
errno = old_errno;
1732
return ret_errno;
1854
return ioctl_errno;
1733
1855
}
1734
1856
} else if(debug){
1735
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
1863
}
1742
1864
1743
1865
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1744
1870
AvahiSServiceBrowser *sb = NULL;
1745
1871
error_t ret_errno;
1746
1872
int ret;
1747
1873
intmax_t tmpmax;
1748
1874
char *tmp;
1749
1875
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
1876
char *interfaces_to_take_down = NULL;
1753
1877
size_t interfaces_to_take_down_size = 0;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1756
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
1882
const char *seckey = PATHDIR "/" SECKEY;
1758
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1759
1884
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
1885
1762
1886
bool gnutls_initialized = false;
1763
1887
bool gpgme_initialized = false;
1854
1978
connect_to = arg;
1855
1979
break;
1856
1980
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1859
1983
if(ret_errno != 0){
1860
1984
argp_error(state, "%s", strerror(ret_errno));
1861
1985
}
1941
2065
/* Work around Debian bug #633582:
1942
2066
<http://bugs.debian.org/633582> */
1943
2067
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
2073
} else {
1946
2074
struct stat st;
1947
2075
1948
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1988
2116
}
1989
2117
1990
2118
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
1995
2123
}
1996
2124
}
1997
2125
}
1998
2126
1999
/* Remove empty interface names */
2127
/* Remove invalid interface names (except "none") */
2000
2128
{
2001
2129
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2003
2131
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2006
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2007
2136
" \"%s\"\n", interface);
2008
2137
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2010
2139
interface = NULL;
2011
2140
}
2012
2141
}
2014
2143
2015
2144
/* Run network hooks */
2016
2145
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
2028
2157
}
2029
2158
2030
2159
if(not debug){
2035
2164
from the signal handler */
2036
2165
/* Initialize the pseudo-RNG for Avahi */
2037
2166
srand((unsigned int) time(NULL));
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2040
2169
fprintf_plus(stderr,
2041
2170
"Avahi: Failed to create simple poll object.\n");
2042
2171
exitcode = EX_UNAVAILABLE;
2107
2236
}
2108
2237
2109
2238
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2239
if(mc.interfaces == NULL){
2111
2240
struct dirent **direntries;
2112
2241
/* Look for any good interfaces */
2113
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2115
2244
if(ret >= 1){
2116
2245
/* Add all found interfaces to interfaces list */
2117
2246
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2119
2248
direntries[i]->d_name);
2120
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2121
2251
perror_plus("argz_add");
2122
2252
continue;
2123
2253
}
2135
2265
}
2136
2266
}
2137
2267
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2150
2270
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2152
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
2285
}
2286
}
2287
break;
2288
}
2153
2289
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2290
errno = bring_up_interface(interface, delay);
2155
2291
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2292
if(errno != 0){
2158
2293
perror_plus("Failed to bring up interface");
2159
2294
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2163
2301
}
2164
2302
}
2165
2303
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
2304
if(debug and (interfaces_to_take_down == NULL)){
2170
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
2306
}
2172
2307
}
2173
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2316
}
2317
2174
2318
if(quit_now){
2175
2319
goto end;
2176
2320
}
2177
2321
2178
ret = init_gnutls_global(pubkey, seckey);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2179
2323
if(ret == -1){
2180
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
2325
exitcode = EX_UNAVAILABLE;
2188
2332
goto end;
2189
2333
}
2190
2334
2191
if(mkdtemp(tempdir) == NULL){
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
2192
2345
perror_plus("mkdtemp");
2193
2346
goto end;
2194
2347
}
2195
tempdir_created = true;
2196
2348
2197
2349
if(quit_now){
2198
2350
goto end;
2199
2351
}
2200
2352
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2202
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2203
2355
exitcode = EX_UNAVAILABLE;
2204
2356
goto end;
2225
2377
goto end;
2226
2378
}
2227
2379
2228
uint16_t port;
2380
in_port_t port;
2229
2381
errno = 0;
2230
2382
tmpmax = strtoimax(address+1, &tmp, 10);
2231
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
or tmpmax != (uint16_t)tmpmax){
2384
or tmpmax != (in_port_t)tmpmax){
2233
2385
fprintf_plus(stderr, "Bad port number\n");
2234
2386
exitcode = EX_USAGE;
2235
2387
goto end;
2236
2388
}
2237
2389
2238
2390
if(quit_now){
2239
2391
goto end;
2240
2392
}
2241
2393
2242
port = (uint16_t)tmpmax;
2394
port = (in_port_t)tmpmax;
2243
2395
*address = '\0';
2244
2396
/* Colon in address indicates IPv6 */
2245
2397
int af;
2261
2413
}
2262
2414
2263
2415
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2265
2418
if(quit_now or ret == 0){
2266
2419
break;
2267
2420
}
2269
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
2423
(int)retry_interval);
2271
2424
}
2272
sleep((int)retry_interval);
2425
sleep((unsigned int)retry_interval);
2273
2426
}
2274
2427
2275
if (not quit_now){
2428
if(not quit_now){
2276
2429
exitcode = EXIT_SUCCESS;
2277
2430
}
2278
2431
2293
2446
config.publish_domain = 0;
2294
2447
2295
2448
/* Allocate a new server */
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2299
2451
2300
2452
/* Free the Avahi configuration data */
2301
2453
avahi_server_config_free(&config);
2316
2468
/* Create the Avahi service browser */
2317
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
2318
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
NULL, 0, browse_callback, NULL);
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2320
2473
if(sb == NULL){
2321
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
2475
avahi_strerror(avahi_server_errno(mc.server)));
2334
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
2488
}
2336
2489
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2339
2492
if(debug){
2340
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
2494
(ret == 0) ? "successfully" : "with error");
2348
2501
}
2349
2502
2350
2503
/* Cleanup things */
2504
free(mc.interfaces);
2505
2351
2506
if(sb != NULL)
2352
2507
avahi_s_service_browser_free(sb);
2353
2508
2354
2509
if(mc.server != NULL)
2355
2510
avahi_server_free(mc.server);
2356
2511
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2359
2514
2360
2515
if(gnutls_initialized){
2361
2516
gnutls_certificate_free_credentials(mc.cred);
2378
2533
}
2379
2534
}
2380
2535
2381
/* Re-raise priviliges */
2536
/* Re-raise privileges */
2382
2537
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
2541
} else {
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
2564
}
2565
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
2569
}
2407
2570
}
2408
2571
2409
2572
free(interfaces_to_take_down);
2410
2573
free(interfaces_hooks);
2411
2574
2412
2575
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
2576
if(tempdir != NULL){
2414
2577
struct dirent **direntries = NULL;
2415
2578
struct dirent *direntry = NULL;
2416
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
2580
alphasort);
2418
if (numentries > 0){
2581
if(numentries > 0){
2419
2582
for(int i = 0; i < numentries; i++){
2420
2583
direntry = direntries[i];
2421
2584
char *fullname = NULL;
2436
2599
2437
2600
/* need to clean even if 0 because man page doesn't specify */
2438
2601
free(direntries);
2439
if (numentries == -1){
2602
if(numentries == -1){
2440
2603
perror_plus("scandir");
2441
2604
}
2442
2605
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0