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- Committer: Teddy Hogeborn
- Date: 2011-12-01 21:01:21 UTC
- mto: (237.15.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- 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
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
265
246
gpgme_error_t rc;
266
247
gpgme_engine_info_t engine_info;
267
248
249
268
250
/*
269
251
* Helper function to insert pub and seckey to the engine keyring.
270
252
*/
271
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
272
254
int ret;
273
255
int fd;
274
256
gpgme_data_t pgp_data;
286
268
return false;
287
269
}
288
270
289
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
290
272
if(rc != GPG_ERR_NO_ERROR){
291
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
274
gpgme_strsource(rc), gpgme_strerror(rc));
336
318
}
337
319
338
320
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
340
322
if(rc != GPG_ERR_NO_ERROR){
341
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
337
* Decrypt OpenPGP data.
356
338
* Returns -1 on error
357
339
*/
358
__attribute__((nonnull, warn_unused_result))
359
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
341
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
342
char **plaintext){
363
343
gpgme_data_t dh_crypto, dh_plain;
364
344
gpgme_error_t rc;
365
345
ssize_t ret;
391
371
392
372
/* Decrypt data from the cryptotext data buffer to the plaintext
393
373
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
375
if(rc != GPG_ERR_NO_ERROR){
396
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
377
gpgme_strsource(rc), gpgme_strerror(rc));
398
378
plaintext_length = -1;
399
379
if(debug){
400
380
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
402
382
if(result == NULL){
403
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
384
} else {
481
461
return plaintext_length;
482
462
}
483
463
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
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 */
487
467
if(ret == NULL)
488
468
ret = "(unknown)";
489
469
return ret;
490
470
}
491
471
492
472
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
473
static void debuggnutls(__attribute__((unused)) int level,
495
474
const char* string){
496
475
fprintf_plus(stderr, "GnuTLS: %s", string);
497
476
}
498
477
499
__attribute__((nonnull, warn_unused_result))
500
478
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
479
const char *seckeyfilename){
503
480
int ret;
504
481
505
482
if(debug){
522
499
}
523
500
524
501
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
503
if(ret != GNUTLS_E_SUCCESS){
527
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
505
safer_gnutls_strerror(ret));
538
515
}
539
516
540
517
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
542
519
GNUTLS_OPENPGP_FMT_BASE64);
543
520
if(ret != GNUTLS_E_SUCCESS){
544
521
fprintf_plus(stderr,
550
527
}
551
528
552
529
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
554
531
if(ret != GNUTLS_E_SUCCESS){
555
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
533
" initialization: %s\n",
557
534
safer_gnutls_strerror(ret));
558
535
goto globalfail;
559
536
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
538
if(ret != GNUTLS_E_SUCCESS){
562
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
540
safer_gnutls_strerror(ret));
564
541
goto globalfail;
565
542
}
566
543
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
545
569
546
return 0;
570
547
571
548
globalfail:
572
549
573
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
574
551
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
576
553
return -1;
577
554
}
578
555
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
582
557
int ret;
583
558
/* GnuTLS session creation */
584
559
do {
596
571
{
597
572
const char *err;
598
573
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
575
if(quit_now){
601
576
gnutls_deinit(*session);
602
577
return -1;
613
588
614
589
do {
615
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
591
mc.cred);
617
592
if(quit_now){
618
593
gnutls_deinit(*session);
619
594
return -1;
629
604
/* ignore client certificate if any. */
630
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
606
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
608
634
609
return 0;
635
610
}
639
614
__attribute__((unused)) const char *txt){}
640
615
641
616
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
644
618
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
619
int af){
646
620
int ret, tcp_sd = -1;
647
621
ssize_t sret;
648
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
649
626
char *buffer = NULL;
650
627
char *decrypted_buffer = NULL;
651
628
size_t buffer_length = 0;
675
652
return -1;
676
653
}
677
654
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);
655
ret = init_gnutls_session(&session);
711
656
if(ret != 0){
712
657
return -1;
713
658
}
714
659
715
660
if(debug){
716
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
718
663
}
719
664
720
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
677
733
678
memset(&to, 0, sizeof(to));
734
679
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
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);
737
682
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
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);
740
685
}
741
686
if(ret < 0 ){
742
687
int e = errno;
751
696
goto mandos_end;
752
697
}
753
698
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((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*/
757
706
if(if_index == AVAHI_IF_UNSPEC){
758
707
fprintf_plus(stderr, "An IPv6 link-local address is"
759
708
" incomplete without a network interface\n");
761
710
goto mandos_end;
762
711
}
763
712
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
765
714
}
766
715
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
768
719
}
769
720
770
721
if(quit_now){
778
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
730
perror_plus("if_indextoname");
780
731
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
783
734
}
784
735
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
787
738
}
788
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
790
742
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
795
745
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
800
748
}
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);
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
}
807
755
}
808
756
}
809
757
813
761
}
814
762
815
763
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
765
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
767
}
822
768
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
770
int e = errno;
825
771
perror_plus("connect");
826
772
errno = e;
872
818
goto mandos_end;
873
819
}
874
820
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(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);
880
823
881
824
if(quit_now){
882
825
errno = EINTR;
987
930
if(buffer_length > 0){
988
931
ssize_t decrypted_buffer_size;
989
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
933
&decrypted_buffer);
991
934
if(decrypted_buffer_size >= 0){
992
935
993
936
written = 0;
1041
984
return retval;
1042
985
}
1043
986
1044
__attribute__((nonnull))
1045
987
static void resolve_callback(AvahiSServiceResolver *r,
1046
988
AvahiIfIndex interface,
1047
989
AvahiProtocol proto,
1055
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
999
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1062
1002
1063
1003
/* Called whenever a service has been resolved successfully or
1064
1004
timed out */
1073
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
1015
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1078
1017
break;
1079
1018
1080
1019
case AVAHI_RESOLVER_FOUND:
1086
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
1026
host_name, ip, (intmax_t)interface, port);
1088
1027
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1093
1030
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1095
1032
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1102
1035
}
1103
1036
}
1104
1037
}
1114
1047
const char *domain,
1115
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1049
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1121
1052
1122
1053
/* Called whenever a new services becomes available on the LAN or
1123
1054
is removed from the LAN */
1131
1062
case AVAHI_BROWSER_FAILURE:
1132
1063
1133
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1137
1067
return;
1138
1068
1139
1069
case AVAHI_BROWSER_NEW:
1142
1072
the callback function is called the Avahi server will free the
1143
1073
resolver for us. */
1144
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1149
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
1079
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1153
1081
break;
1154
1082
1155
1083
case AVAHI_BROWSER_REMOVE:
1174
1102
signal_received = sig;
1175
1103
int old_errno = errno;
1176
1104
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1179
1107
}
1180
1108
errno = old_errno;
1181
1109
}
1182
1110
1183
__attribute__((nonnull, warn_unused_result))
1184
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1112
int ret;
1186
error_t ret_errno;
1187
1113
1188
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1115
if(s < 0){
1190
ret_errno = errno;
1191
1116
perror_plus("socket");
1192
errno = ret_errno;
1193
1117
return false;
1194
1118
}
1195
1119
strcpy(ifr->ifr_name, ifname);
1196
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1121
if(ret == -1){
1198
1122
if(debug){
1199
ret_errno = errno;
1200
1123
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1124
}
1203
1125
return false;
1204
1126
}
1205
1127
return true;
1206
1128
}
1207
1129
1208
__attribute__((nonnull, warn_unused_result))
1209
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1131
1211
1132
/* Reject the loopback device */
1253
1174
* corresponds to an acceptable network device.
1254
1175
* (This function is passed to scandir(3) as a filter function.)
1255
1176
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1177
int good_interface(const struct dirent *if_entry){
1258
1178
if(if_entry->d_name[0] == '.'){
1259
1179
return 0;
1275
1195
}
1276
1196
1277
1197
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__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
1312
1240
int notdotentries(const struct dirent *direntry){
1313
1241
/* Skip "." and ".." */
1314
1242
if(direntry->d_name[0] == '.'
1321
1249
}
1322
1250
1323
1251
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1252
int runnable_hook(const struct dirent *direntry){
1326
1253
int ret;
1327
1254
size_t sret;
1382
1309
return 1;
1383
1310
}
1384
1311
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1388
1313
int ret;
1389
1314
struct timespec now;
1390
1315
struct timespec waited_time;
1391
1316
intmax_t block_time;
1392
1317
1393
1318
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1396
1321
fprintf_plus(stderr, "Wait until first server is found."
1397
1322
" No timeout!\n");
1398
1323
}
1399
1324
ret = avahi_simple_poll_iterate(s, -1);
1400
1325
} else {
1401
if(debug){
1326
if (debug){
1402
1327
fprintf_plus(stderr, "Check current_server if we should run"
1403
1328
" it, or wait\n");
1404
1329
}
1411
1336
/* Calculating in ms how long time between now and server
1412
1337
who we visted longest time ago. Now - last seen. */
1413
1338
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1415
1340
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1417
1342
/* total time is 10s/10,000ms.
1418
1343
Converting to s from ms by dividing by 1,000,
1419
1344
and ns to ms by dividing by 1,000,000. */
1421
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1422
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1348
1424
if(debug){
1349
if (debug){
1425
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
1351
block_time);
1427
1352
}
1428
1353
1429
1354
if(block_time <= 0){
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);
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);
1434
1359
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1436
1361
return 0;
1437
1362
}
1438
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1440
1365
if(ret == -1){
1441
1366
perror_plus("clock_gettime");
1442
1367
return -1;
1443
1368
}
1444
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1445
1370
block_time = 0; /* Call avahi to find new Mandos
1446
1371
servers, but don't block */
1447
1372
}
1449
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
1375
}
1451
1376
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1453
1378
return (ret != 1) ? ret : 0;
1454
1379
}
1455
1380
}
1456
1381
}
1457
1382
}
1458
1383
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1517
1385
const float delay){
1518
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1519
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
1390
alphasort);
1521
1391
if(numhooks == -1){
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
}
1392
perror_plus("scandir");
1530
1393
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
1394
int devnull = open("/dev/null", O_RDONLY);
1534
1395
for(int i = 0; i < numhooks; i++){
1535
1396
direntry = direntries[i];
1547
1408
if(hook_pid == 0){
1548
1409
/* Child */
1549
1410
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_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");
1553
1421
}
1554
1422
/* Set group */
1555
1423
errno = 0;
1556
1424
ret = setgid(0);
1557
1425
if(ret == -1){
1558
1426
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
1427
}
1561
1428
/* Reset supplementary groups */
1562
1429
errno = 0;
1563
1430
ret = setgroups(0, NULL);
1564
1431
if(ret == -1){
1565
1432
perror_plus("setgroups");
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
}
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
1438
if(ret == -1){
1585
1439
perror_plus("setenv");
1590
1444
perror_plus("setenv");
1591
1445
_exit(EX_OSERR);
1592
1446
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1594
1448
if(ret == -1){
1595
1449
perror_plus("setenv");
1596
1450
_exit(EX_OSERR);
1601
1455
_exit(EX_OSERR);
1602
1456
}
1603
1457
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1458
ret = asprintf(&delaystring, "%f", delay);
1605
1459
if(ret == -1){
1606
1460
perror_plus("asprintf");
1607
1461
_exit(EX_OSERR);
1613
1467
_exit(EX_OSERR);
1614
1468
}
1615
1469
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1627
1472
} else {
1628
1473
int status;
1629
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
1505
}
1661
1506
close(devnull);
1662
1507
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
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
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
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
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1778
break;
1779
}
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
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
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1508
return true;
1863
1509
}
1864
1510
1865
1511
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 };
1870
1512
AvahiSServiceBrowser *sb = NULL;
1871
error_t ret_errno;
1513
int error;
1872
1514
int ret;
1873
1515
intmax_t tmpmax;
1874
1516
char *tmp;
1875
1517
int exitcode = EXIT_SUCCESS;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
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;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
1881
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
1527
const char *seckey = PATHDIR "/" SECKEY;
1883
1528
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1885
1529
1886
1530
bool gnutls_initialized = false;
1887
1531
bool gpgme_initialized = false;
1949
1593
.group = 2 },
1950
1594
{ .name = "retry", .key = 132,
1951
1595
.arg = "SECONDS",
1952
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
1953
1597
.group = 2 },
1954
1598
{ .name = "network-hook-dir", .key = 133,
1955
1599
.arg = "DIR",
1978
1622
connect_to = arg;
1979
1623
break;
1980
1624
case 'i': /* --interface */
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1625
interface = arg;
1986
1626
break;
1987
1627
case 's': /* --seckey */
1988
1628
seckey = arg;
2031
1671
argp_state_help(state, state->out_stream,
2032
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2033
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
2034
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2035
1677
exit(argp_err_exit_status);
2036
1678
break;
2065
1707
/* Work around Debian bug #633582:
2066
1708
<http://bugs.debian.org/633582> */
2067
1709
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");
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2073
1715
} else {
2074
1716
struct stat st;
2075
1717
2116
1758
}
2117
1759
2118
1760
/* Lower privileges */
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2140
1765
}
2141
1766
}
2142
1767
}
2143
1768
2144
1769
/* Run network hooks */
2145
{
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);
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2157
1772
}
2158
1773
2159
1774
if(not debug){
2160
1775
avahi_set_log_function(empty_log);
2161
1776
}
2162
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
2163
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
1811
from the signal handler */
2165
1812
/* Initialize the pseudo-RNG for Avahi */
2166
1813
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2169
1816
fprintf_plus(stderr,
2170
1817
"Avahi: Failed to create simple poll object.\n");
2171
1818
exitcode = EX_UNAVAILABLE;
2235
1882
}
2236
1883
}
2237
1884
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
2260
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
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;
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");
2285
1970
}
2286
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){
2287
1989
break;
2288
1990
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
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
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
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);
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
}
2316
2020
}
2317
2021
2318
2022
if(quit_now){
2319
2023
goto end;
2320
2024
}
2321
2025
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2323
2027
if(ret == -1){
2324
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
2029
exitcode = EX_UNAVAILABLE;
2332
2036
goto end;
2333
2037
}
2334
2038
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){
2039
if(mkdtemp(tempdir) == NULL){
2345
2040
perror_plus("mkdtemp");
2346
2041
goto end;
2347
2042
}
2043
tempdir_created = true;
2348
2044
2349
2045
if(quit_now){
2350
2046
goto end;
2351
2047
}
2352
2048
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2354
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2355
2051
exitcode = EX_UNAVAILABLE;
2356
2052
goto end;
2366
2062
/* Connect directly, do not use Zeroconf */
2367
2063
/* (Mainly meant for debugging) */
2368
2064
char *address = strrchr(connect_to, ':');
2369
2370
2065
if(address == NULL){
2371
2066
fprintf_plus(stderr, "No colon in address\n");
2372
2067
exitcode = EX_USAGE;
2377
2072
goto end;
2378
2073
}
2379
2074
2380
in_port_t port;
2075
uint16_t port;
2381
2076
errno = 0;
2382
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2383
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2385
2080
fprintf_plus(stderr, "Bad port number\n");
2386
2081
exitcode = EX_USAGE;
2387
2082
goto end;
2388
2083
}
2389
2084
2390
2085
if(quit_now){
2391
2086
goto end;
2392
2087
}
2393
2088
2394
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2395
2090
*address = '\0';
2396
2091
/* Colon in address indicates IPv6 */
2397
2092
int af;
2413
2108
}
2414
2109
2415
2110
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2418
2112
if(quit_now or ret == 0){
2419
2113
break;
2420
2114
}
2422
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
2117
(int)retry_interval);
2424
2118
}
2425
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2426
2120
}
2427
2121
2428
if(not quit_now){
2122
if (not quit_now){
2429
2123
exitcode = EXIT_SUCCESS;
2430
2124
}
2431
2125
2446
2140
config.publish_domain = 0;
2447
2141
2448
2142
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2451
2146
2452
2147
/* Free the Avahi configuration data */
2453
2148
avahi_server_config_free(&config);
2456
2151
/* Check if creating the Avahi server object succeeded */
2457
2152
if(mc.server == NULL){
2458
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2154
avahi_strerror(error));
2460
2155
exitcode = EX_UNAVAILABLE;
2461
2156
goto end;
2462
2157
}
2468
2163
/* Create the Avahi service browser */
2469
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2473
2167
if(sb == NULL){
2474
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
2169
avahi_strerror(avahi_server_errno(mc.server)));
2487
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2488
2182
}
2489
2183
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2492
2186
if(debug){
2493
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
2188
(ret == 0) ? "successfully" : "with error");
2501
2195
}
2502
2196
2503
2197
/* Cleanup things */
2504
free(mc.interfaces);
2505
2506
2198
if(sb != NULL)
2507
2199
avahi_s_service_browser_free(sb);
2508
2200
2509
2201
if(mc.server != NULL)
2510
2202
avahi_server_free(mc.server);
2511
2203
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2514
2206
2515
2207
if(gnutls_initialized){
2516
2208
gnutls_certificate_free_credentials(mc.cred);
2533
2225
}
2534
2226
}
2535
2227
2536
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2537
2232
{
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
}
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2564
2237
}
2565
2238
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
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
}
2569
2255
}
2570
2256
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2574
2263
2575
2264
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2265
if(tempdir_created){
2577
2266
struct dirent **direntries = NULL;
2578
2267
struct dirent *direntry = NULL;
2579
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
2269
alphasort);
2581
if(numentries > 0){
2270
if (numentries > 0){
2582
2271
for(int i = 0; i < numentries; i++){
2583
2272
direntry = direntries[i];
2584
2273
char *fullname = NULL;
2599
2288
2600
2289
/* need to clean even if 0 because man page doesn't specify */
2601
2290
free(direntries);
2602
if(numentries == -1){
2291
if (numentries == -1){
2603
2292
perror_plus("scandir");
2604
2293
}
2605
2294
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0