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- Committer: Teddy Hogeborn
- Date: 2011-12-01 21:01:21 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111201210121-6zpzlxdschiv0gzc
Added sample OpenVPN network hook.
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
- files removed:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
91
98
92
#ifdef __linux__
99
93
#include <sys/klog.h> /* klogctl() */
141
135
static const char sys_class_net[] = "/sys/class/net";
142
136
char *connect_to = NULL;
143
137
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
138
147
139
/* Doubly linked list that need to be circularly linked when used */
148
140
typedef struct server{
149
141
const char *ip;
150
in_port_t port;
142
uint16_t port;
151
143
AvahiIfIndex if_index;
152
144
int af;
153
145
struct timespec last_seen;
157
149
158
150
/* Used for passing in values through the Avahi callback functions */
159
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
160
153
AvahiServer *server;
161
154
gnutls_certificate_credentials_t cred;
162
155
unsigned int dh_bits;
164
157
const char *priority;
165
158
gpgme_ctx_t ctx;
166
159
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
160
} mandos_context;
170
161
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
167
174
168
sig_atomic_t quit_now = 0;
175
169
int signal_received = 0;
176
170
177
171
/* Function to use when printing errors */
178
172
void perror_plus(const char *print_text){
179
int e = errno;
180
173
fprintf(stderr, "Mandos plugin %s: ",
181
174
program_invocation_short_name);
182
errno = e;
183
175
perror(print_text);
184
176
}
185
177
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
178
int fprintf_plus(FILE *stream, const char *format, ...){
188
179
va_list ap;
189
180
va_start (ap, format);
190
181
191
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
183
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
185
}
195
186
196
187
/*
198
189
* bytes. "buffer_capacity" is how much is currently allocated,
199
190
* "buffer_length" is how much is already used.
200
191
*/
201
__attribute__((nonnull, warn_unused_result))
202
192
size_t incbuffer(char **buffer, size_t buffer_length,
203
193
size_t buffer_capacity){
204
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
211
197
return 0;
212
198
}
213
*buffer = new_buf;
214
199
buffer_capacity += BUFFER_SIZE;
215
200
}
216
201
return buffer_capacity;
217
202
}
218
203
219
204
/* Add server to set of servers to retry periodically */
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){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
223
207
int ret;
224
208
server *new_server = malloc(sizeof(server));
225
209
if(new_server == NULL){
226
210
perror_plus("malloc");
227
return false;
211
return -1;
228
212
}
229
213
*new_server = (server){ .ip = strdup(ip),
230
214
.port = port,
232
216
.af = af };
233
217
if(new_server->ip == NULL){
234
218
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
219
return -1;
241
220
}
242
221
/* Special case of first server */
243
if(*current_server == NULL){
222
if (mc.current_server == NULL){
244
223
new_server->next = new_server;
245
224
new_server->prev = new_server;
246
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
247
227
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
251
230
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
255
239
}
256
240
257
241
/*
258
242
* Initialize GPGME.
259
243
*/
260
__attribute__((nonnull, warn_unused_result))
261
244
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
245
const char *tempdir){
263
246
gpgme_error_t rc;
264
247
gpgme_engine_info_t engine_info;
265
248
249
266
250
/*
267
251
* Helper function to insert pub and seckey to the engine keyring.
268
252
*/
284
268
return false;
285
269
}
286
270
287
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
288
272
if(rc != GPG_ERR_NO_ERROR){
289
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
274
gpgme_strsource(rc), gpgme_strerror(rc));
334
318
}
335
319
336
320
/* Create new GPGME "context" */
337
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
338
322
if(rc != GPG_ERR_NO_ERROR){
339
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
353
337
* Decrypt OpenPGP data.
354
338
* Returns -1 on error
355
339
*/
356
__attribute__((nonnull, warn_unused_result))
357
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
358
341
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
342
char **plaintext){
361
343
gpgme_data_t dh_crypto, dh_plain;
362
344
gpgme_error_t rc;
363
345
ssize_t ret;
389
371
390
372
/* Decrypt data from the cryptotext data buffer to the plaintext
391
373
data buffer */
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
393
375
if(rc != GPG_ERR_NO_ERROR){
394
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
377
gpgme_strsource(rc), gpgme_strerror(rc));
396
378
plaintext_length = -1;
397
379
if(debug){
398
380
gpgme_decrypt_result_t result;
399
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
400
382
if(result == NULL){
401
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
402
384
} else {
479
461
return plaintext_length;
480
462
}
481
463
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
485
467
if(ret == NULL)
486
468
ret = "(unknown)";
487
469
return ret;
488
470
}
489
471
490
472
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
473
static void debuggnutls(__attribute__((unused)) int level,
493
474
const char* string){
494
475
fprintf_plus(stderr, "GnuTLS: %s", string);
495
476
}
496
477
497
__attribute__((nonnull, warn_unused_result))
498
478
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
479
const char *seckeyfilename){
501
480
int ret;
502
481
503
482
if(debug){
520
499
}
521
500
522
501
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
524
503
if(ret != GNUTLS_E_SUCCESS){
525
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
505
safer_gnutls_strerror(ret));
536
515
}
537
516
538
517
ret = gnutls_certificate_set_openpgp_key_file
539
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
540
519
GNUTLS_OPENPGP_FMT_BASE64);
541
520
if(ret != GNUTLS_E_SUCCESS){
542
521
fprintf_plus(stderr,
548
527
}
549
528
550
529
/* GnuTLS server initialization */
551
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
552
531
if(ret != GNUTLS_E_SUCCESS){
553
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
533
" initialization: %s\n",
555
534
safer_gnutls_strerror(ret));
556
535
goto globalfail;
557
536
}
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
559
538
if(ret != GNUTLS_E_SUCCESS){
560
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
540
safer_gnutls_strerror(ret));
562
541
goto globalfail;
563
542
}
564
543
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
566
545
567
546
return 0;
568
547
569
548
globalfail:
570
549
571
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
572
551
gnutls_global_deinit();
573
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
574
553
return -1;
575
554
}
576
555
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
580
557
int ret;
581
558
/* GnuTLS session creation */
582
559
do {
594
571
{
595
572
const char *err;
596
573
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
598
575
if(quit_now){
599
576
gnutls_deinit(*session);
600
577
return -1;
611
588
612
589
do {
613
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
591
mc.cred);
615
592
if(quit_now){
616
593
gnutls_deinit(*session);
617
594
return -1;
627
604
/* ignore client certificate if any. */
628
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
629
606
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
631
608
632
609
return 0;
633
610
}
637
614
__attribute__((unused)) const char *txt){}
638
615
639
616
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
642
618
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
619
int af){
644
620
int ret, tcp_sd = -1;
645
621
ssize_t sret;
646
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
647
626
char *buffer = NULL;
648
627
char *decrypted_buffer = NULL;
649
628
size_t buffer_length = 0;
673
652
return -1;
674
653
}
675
654
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
709
656
if(ret != 0){
710
657
return -1;
711
658
}
712
659
713
660
if(debug){
714
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
716
663
}
717
664
718
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
677
731
678
memset(&to, 0, sizeof(to));
732
679
if(af == AF_INET6){
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
682
} else { /* IPv4 */
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
738
685
}
739
686
if(ret < 0 ){
740
687
int e = errno;
749
696
goto mandos_end;
750
697
}
751
698
if(af == AF_INET6){
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
755
706
if(if_index == AVAHI_IF_UNSPEC){
756
707
fprintf_plus(stderr, "An IPv6 link-local address is"
757
708
" incomplete without a network interface\n");
759
710
goto mandos_end;
760
711
}
761
712
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
763
714
}
764
715
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
766
719
}
767
720
768
721
if(quit_now){
776
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
730
perror_plus("if_indextoname");
778
731
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
781
734
}
782
735
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
785
738
}
786
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
788
742
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
793
745
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
798
748
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
805
755
}
806
756
}
807
757
811
761
}
812
762
813
763
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
765
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
767
}
820
768
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
770
int e = errno;
823
771
perror_plus("connect");
824
772
errno = e;
870
818
goto mandos_end;
871
819
}
872
820
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
878
823
879
824
if(quit_now){
880
825
errno = EINTR;
985
930
if(buffer_length > 0){
986
931
ssize_t decrypted_buffer_size;
987
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
933
&decrypted_buffer);
989
934
if(decrypted_buffer_size >= 0){
990
935
991
936
written = 0;
1039
984
return retval;
1040
985
}
1041
986
1042
__attribute__((nonnull))
1043
987
static void resolve_callback(AvahiSServiceResolver *r,
1044
988
AvahiIfIndex interface,
1045
989
AvahiProtocol proto,
1053
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
999
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1060
1002
1061
1003
/* Called whenever a service has been resolved successfully or
1062
1004
timed out */
1071
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
1015
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1076
1017
break;
1077
1018
1078
1019
case AVAHI_RESOLVER_FOUND:
1084
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
1026
host_name, ip, (intmax_t)interface, port);
1086
1027
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1091
1030
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1093
1032
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1100
1035
}
1101
1036
}
1102
1037
}
1112
1047
const char *domain,
1113
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
1049
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1119
1052
1120
1053
/* Called whenever a new services becomes available on the LAN or
1121
1054
is removed from the LAN */
1129
1062
case AVAHI_BROWSER_FAILURE:
1130
1063
1131
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1135
1067
return;
1136
1068
1137
1069
case AVAHI_BROWSER_NEW:
1140
1072
the callback function is called the Avahi server will free the
1141
1073
resolver for us. */
1142
1074
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1147
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
1079
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1151
1081
break;
1152
1082
1153
1083
case AVAHI_BROWSER_REMOVE:
1172
1102
signal_received = sig;
1173
1103
int old_errno = errno;
1174
1104
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1177
1107
}
1178
1108
errno = old_errno;
1179
1109
}
1180
1110
1181
__attribute__((nonnull, warn_unused_result))
1182
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
1112
int ret;
1184
error_t ret_errno;
1185
1113
1186
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
1115
if(s < 0){
1188
ret_errno = errno;
1189
1116
perror_plus("socket");
1190
errno = ret_errno;
1191
1117
return false;
1192
1118
}
1193
1119
strcpy(ifr->ifr_name, ifname);
1194
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
1121
if(ret == -1){
1196
1122
if(debug){
1197
ret_errno = errno;
1198
1123
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
1124
}
1201
1125
return false;
1202
1126
}
1203
1127
return true;
1204
1128
}
1205
1129
1206
__attribute__((nonnull, warn_unused_result))
1207
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1131
1209
1132
/* Reject the loopback device */
1251
1174
* corresponds to an acceptable network device.
1252
1175
* (This function is passed to scandir(3) as a filter function.)
1253
1176
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
1177
int good_interface(const struct dirent *if_entry){
1256
1178
if(if_entry->d_name[0] == '.'){
1257
1179
return 0;
1273
1195
}
1274
1196
1275
1197
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1310
1240
int notdotentries(const struct dirent *direntry){
1311
1241
/* Skip "." and ".." */
1312
1242
if(direntry->d_name[0] == '.'
1319
1249
}
1320
1250
1321
1251
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
1252
int runnable_hook(const struct dirent *direntry){
1324
1253
int ret;
1325
1254
size_t sret;
1380
1309
return 1;
1381
1310
}
1382
1311
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1313
int ret;
1387
1314
struct timespec now;
1388
1315
struct timespec waited_time;
1389
1316
intmax_t block_time;
1390
1317
1391
1318
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1394
1321
fprintf_plus(stderr, "Wait until first server is found."
1395
1322
" No timeout!\n");
1396
1323
}
1397
1324
ret = avahi_simple_poll_iterate(s, -1);
1398
1325
} else {
1399
if(debug){
1326
if (debug){
1400
1327
fprintf_plus(stderr, "Check current_server if we should run"
1401
1328
" it, or wait\n");
1402
1329
}
1409
1336
/* Calculating in ms how long time between now and server
1410
1337
who we visted longest time ago. Now - last seen. */
1411
1338
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1413
1340
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1415
1342
/* total time is 10s/10,000ms.
1416
1343
Converting to s from ms by dividing by 1,000,
1417
1344
and ns to ms by dividing by 1,000,000. */
1419
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1348
1422
if(debug){
1349
if (debug){
1423
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
1351
block_time);
1425
1352
}
1426
1353
1427
1354
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1432
1359
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1434
1361
return 0;
1435
1362
}
1436
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1438
1365
if(ret == -1){
1439
1366
perror_plus("clock_gettime");
1440
1367
return -1;
1441
1368
}
1442
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1443
1370
block_time = 0; /* Call avahi to find new Mandos
1444
1371
servers, but don't block */
1445
1372
}
1447
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1375
}
1449
1376
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1451
1378
return (ret != 1) ? ret : 0;
1452
1379
}
1453
1380
}
1454
1381
}
1455
1382
}
1456
1383
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1515
1385
const float delay){
1516
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1517
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
1390
alphasort);
1519
1391
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1392
perror_plus("scandir");
1528
1393
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
1394
int devnull = open("/dev/null", O_RDONLY);
1532
1395
for(int i = 0; i < numhooks; i++){
1533
1396
direntry = direntries[i];
1545
1408
if(hook_pid == 0){
1546
1409
/* Child */
1547
1410
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1551
1421
}
1552
1422
/* Set group */
1553
1423
errno = 0;
1554
1424
ret = setgid(0);
1555
1425
if(ret == -1){
1556
1426
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
1427
}
1559
1428
/* Reset supplementary groups */
1560
1429
errno = 0;
1561
1430
ret = setgroups(0, NULL);
1562
1431
if(ret == -1){
1563
1432
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1581
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
1438
if(ret == -1){
1583
1439
perror_plus("setenv");
1588
1444
perror_plus("setenv");
1589
1445
_exit(EX_OSERR);
1590
1446
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1592
1448
if(ret == -1){
1593
1449
perror_plus("setenv");
1594
1450
_exit(EX_OSERR);
1599
1455
_exit(EX_OSERR);
1600
1456
}
1601
1457
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1458
ret = asprintf(&delaystring, "%f", delay);
1603
1459
if(ret == -1){
1604
1460
perror_plus("asprintf");
1605
1461
_exit(EX_OSERR);
1611
1467
_exit(EX_OSERR);
1612
1468
}
1613
1469
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1625
1472
} else {
1626
1473
int status;
1627
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1658
1505
}
1659
1506
close(devnull);
1660
1507
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1508
return true;
1859
1509
}
1860
1510
1861
1511
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1866
1512
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
1513
int error;
1868
1514
int ret;
1869
1515
intmax_t tmpmax;
1870
1516
char *tmp;
1871
1517
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1874
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1875
1525
bool tempdir_created = false;
1876
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
1527
const char *seckey = PATHDIR "/" SECKEY;
1878
1528
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
1529
1881
1530
bool gnutls_initialized = false;
1882
1531
bool gpgme_initialized = false;
1944
1593
.group = 2 },
1945
1594
{ .name = "retry", .key = 132,
1946
1595
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
1948
1597
.group = 2 },
1949
1598
{ .name = "network-hook-dir", .key = 133,
1950
1599
.arg = "DIR",
1973
1622
connect_to = arg;
1974
1623
break;
1975
1624
case 'i': /* --interface */
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1625
interface = arg;
1981
1626
break;
1982
1627
case 's': /* --seckey */
1983
1628
seckey = arg;
2026
1671
argp_state_help(state, state->out_stream,
2027
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
2029
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2030
1677
exit(argp_err_exit_status);
2031
1678
break;
2060
1707
/* Work around Debian bug #633582:
2061
1708
<http://bugs.debian.org/633582> */
2062
1709
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2068
1715
} else {
2069
1716
struct stat st;
2070
1717
2111
1758
}
2112
1759
2113
1760
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2135
1765
}
2136
1766
}
2137
1767
}
2138
1768
2139
1769
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2152
1772
}
2153
1773
2154
1774
if(not debug){
2155
1775
avahi_set_log_function(empty_log);
2156
1776
}
2157
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2158
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2159
1811
from the signal handler */
2160
1812
/* Initialize the pseudo-RNG for Avahi */
2161
1813
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2164
1816
fprintf_plus(stderr,
2165
1817
"Avahi: Failed to create simple poll object.\n");
2166
1818
exitcode = EX_UNAVAILABLE;
2230
1882
}
2231
1883
}
2232
1884
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2280
1970
}
2281
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2282
1989
break;
2283
1990
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2311
2020
}
2312
2021
2313
2022
if(quit_now){
2314
2023
goto end;
2315
2024
}
2316
2025
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2318
2027
if(ret == -1){
2319
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2320
2029
exitcode = EX_UNAVAILABLE;
2337
2046
goto end;
2338
2047
}
2339
2048
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2341
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2342
2051
exitcode = EX_UNAVAILABLE;
2343
2052
goto end;
2353
2062
/* Connect directly, do not use Zeroconf */
2354
2063
/* (Mainly meant for debugging) */
2355
2064
char *address = strrchr(connect_to, ':');
2356
2357
2065
if(address == NULL){
2358
2066
fprintf_plus(stderr, "No colon in address\n");
2359
2067
exitcode = EX_USAGE;
2364
2072
goto end;
2365
2073
}
2366
2074
2367
in_port_t port;
2075
uint16_t port;
2368
2076
errno = 0;
2369
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2370
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2372
2080
fprintf_plus(stderr, "Bad port number\n");
2373
2081
exitcode = EX_USAGE;
2374
2082
goto end;
2375
2083
}
2376
2084
2377
2085
if(quit_now){
2378
2086
goto end;
2379
2087
}
2380
2088
2381
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2382
2090
*address = '\0';
2383
2091
/* Colon in address indicates IPv6 */
2384
2092
int af;
2400
2108
}
2401
2109
2402
2110
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2405
2112
if(quit_now or ret == 0){
2406
2113
break;
2407
2114
}
2409
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
2117
(int)retry_interval);
2411
2118
}
2412
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2413
2120
}
2414
2121
2415
if(not quit_now){
2122
if (not quit_now){
2416
2123
exitcode = EXIT_SUCCESS;
2417
2124
}
2418
2125
2433
2140
config.publish_domain = 0;
2434
2141
2435
2142
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2438
2146
2439
2147
/* Free the Avahi configuration data */
2440
2148
avahi_server_config_free(&config);
2443
2151
/* Check if creating the Avahi server object succeeded */
2444
2152
if(mc.server == NULL){
2445
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
2154
avahi_strerror(error));
2447
2155
exitcode = EX_UNAVAILABLE;
2448
2156
goto end;
2449
2157
}
2455
2163
/* Create the Avahi service browser */
2456
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2460
2167
if(sb == NULL){
2461
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
2169
avahi_strerror(avahi_server_errno(mc.server)));
2474
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
2182
}
2476
2183
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2479
2186
if(debug){
2480
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
2188
(ret == 0) ? "successfully" : "with error");
2488
2195
}
2489
2196
2490
2197
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
2198
if(sb != NULL)
2494
2199
avahi_s_service_browser_free(sb);
2495
2200
2496
2201
if(mc.server != NULL)
2497
2202
avahi_server_free(mc.server);
2498
2203
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2501
2206
2502
2207
if(gnutls_initialized){
2503
2208
gnutls_certificate_free_credentials(mc.cred);
2520
2225
}
2521
2226
}
2522
2227
2523
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2524
2232
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2255
}
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2560
2263
2561
2264
/* Removes the GPGME temp directory and all files inside */
2562
2265
if(tempdir_created){
2564
2267
struct dirent *direntry = NULL;
2565
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
2269
alphasort);
2567
if(numentries > 0){
2270
if (numentries > 0){
2568
2271
for(int i = 0; i < numentries; i++){
2569
2272
direntry = direntries[i];
2570
2273
char *fullname = NULL;
2585
2288
2586
2289
/* need to clean even if 0 because man page doesn't specify */
2587
2290
free(direntries);
2588
if(numentries == -1){
2291
if (numentries == -1){
2589
2292
perror_plus("scandir");
2590
2293
}
2591
2294
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0