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- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- 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))
178
__attribute__((format (gnu_printf, 2, 3)))
187
179
int fprintf_plus(FILE *stream, const char *format, ...){
188
180
va_list ap;
189
181
va_start (ap, format);
190
182
191
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
184
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
186
}
195
187
196
188
/*
198
190
* bytes. "buffer_capacity" is how much is currently allocated,
199
191
* "buffer_length" is how much is already used.
200
192
*/
201
__attribute__((nonnull, warn_unused_result))
202
193
size_t incbuffer(char **buffer, size_t buffer_length,
203
194
size_t buffer_capacity){
204
195
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;
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
211
198
return 0;
212
199
}
213
*buffer = new_buf;
214
200
buffer_capacity += BUFFER_SIZE;
215
201
}
216
202
return buffer_capacity;
217
203
}
218
204
219
205
/* 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){
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
223
208
int ret;
224
209
server *new_server = malloc(sizeof(server));
225
210
if(new_server == NULL){
234
219
perror_plus("strdup");
235
220
return false;
236
221
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
222
/* Special case of first server */
243
if(*current_server == NULL){
223
if (mc.current_server == NULL){
244
224
new_server->next = new_server;
245
225
new_server->prev = new_server;
246
*current_server = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
247
228
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
251
231
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
253
238
}
254
239
return true;
255
240
}
257
242
/*
258
243
* Initialize GPGME.
259
244
*/
260
__attribute__((nonnull, warn_unused_result))
261
245
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
246
const char *tempdir){
263
247
gpgme_error_t rc;
264
248
gpgme_engine_info_t engine_info;
265
249
250
266
251
/*
267
252
* Helper function to insert pub and seckey to the engine keyring.
268
253
*/
284
269
return false;
285
270
}
286
271
287
rc = gpgme_op_import(mc->ctx, pgp_data);
272
rc = gpgme_op_import(mc.ctx, pgp_data);
288
273
if(rc != GPG_ERR_NO_ERROR){
289
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
275
gpgme_strsource(rc), gpgme_strerror(rc));
334
319
}
335
320
336
321
/* Create new GPGME "context" */
337
rc = gpgme_new(&(mc->ctx));
322
rc = gpgme_new(&(mc.ctx));
338
323
if(rc != GPG_ERR_NO_ERROR){
339
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
353
338
* Decrypt OpenPGP data.
354
339
* Returns -1 on error
355
340
*/
356
__attribute__((nonnull, warn_unused_result))
357
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
358
342
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
343
char **plaintext){
361
344
gpgme_data_t dh_crypto, dh_plain;
362
345
gpgme_error_t rc;
363
346
ssize_t ret;
389
372
390
373
/* Decrypt data from the cryptotext data buffer to the plaintext
391
374
data buffer */
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
393
376
if(rc != GPG_ERR_NO_ERROR){
394
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
378
gpgme_strsource(rc), gpgme_strerror(rc));
396
379
plaintext_length = -1;
397
380
if(debug){
398
381
gpgme_decrypt_result_t result;
399
result = gpgme_op_decrypt_result(mc->ctx);
382
result = gpgme_op_decrypt_result(mc.ctx);
400
383
if(result == NULL){
401
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
402
385
} else {
479
462
return plaintext_length;
480
463
}
481
464
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
485
468
if(ret == NULL)
486
469
ret = "(unknown)";
487
470
return ret;
488
471
}
489
472
490
473
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
474
static void debuggnutls(__attribute__((unused)) int level,
493
475
const char* string){
494
476
fprintf_plus(stderr, "GnuTLS: %s", string);
495
477
}
496
478
497
__attribute__((nonnull, warn_unused_result))
498
479
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
480
const char *seckeyfilename){
501
481
int ret;
502
482
503
483
if(debug){
520
500
}
521
501
522
502
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
524
504
if(ret != GNUTLS_E_SUCCESS){
525
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
506
safer_gnutls_strerror(ret));
536
516
}
537
517
538
518
ret = gnutls_certificate_set_openpgp_key_file
539
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
540
520
GNUTLS_OPENPGP_FMT_BASE64);
541
521
if(ret != GNUTLS_E_SUCCESS){
542
522
fprintf_plus(stderr,
548
528
}
549
529
550
530
/* GnuTLS server initialization */
551
ret = gnutls_dh_params_init(&mc->dh_params);
531
ret = gnutls_dh_params_init(&mc.dh_params);
552
532
if(ret != GNUTLS_E_SUCCESS){
553
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
534
" initialization: %s\n",
555
535
safer_gnutls_strerror(ret));
556
536
goto globalfail;
557
537
}
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
559
539
if(ret != GNUTLS_E_SUCCESS){
560
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
541
safer_gnutls_strerror(ret));
562
542
goto globalfail;
563
543
}
564
544
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
566
546
567
547
return 0;
568
548
569
549
globalfail:
570
550
571
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
572
552
gnutls_global_deinit();
573
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_dh_params_deinit(mc.dh_params);
574
554
return -1;
575
555
}
576
556
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
557
static int init_gnutls_session(gnutls_session_t *session){
580
558
int ret;
581
559
/* GnuTLS session creation */
582
560
do {
594
572
{
595
573
const char *err;
596
574
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
598
576
if(quit_now){
599
577
gnutls_deinit(*session);
600
578
return -1;
611
589
612
590
do {
613
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
592
mc.cred);
615
593
if(quit_now){
616
594
gnutls_deinit(*session);
617
595
return -1;
627
605
/* ignore client certificate if any. */
628
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
629
607
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
631
609
632
610
return 0;
633
611
}
637
615
__attribute__((unused)) const char *txt){}
638
616
639
617
/* 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,
618
static int start_mandos_communication(const char *ip, uint16_t port,
642
619
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
620
int af){
644
621
int ret, tcp_sd = -1;
645
622
ssize_t sret;
646
struct sockaddr_storage to;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
647
627
char *buffer = NULL;
648
628
char *decrypted_buffer = NULL;
649
629
size_t buffer_length = 0;
673
653
return -1;
674
654
}
675
655
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);
656
ret = init_gnutls_session(&session);
709
657
if(ret != 0){
710
658
return -1;
711
659
}
712
660
713
661
if(debug){
714
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
663
PRIu16 "\n", ip, port);
716
664
}
717
665
718
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
678
731
679
memset(&to, 0, sizeof(to));
732
680
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);
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
683
} 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);
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
738
686
}
739
687
if(ret < 0 ){
740
688
int e = errno;
749
697
goto mandos_end;
750
698
}
751
699
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)){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
755
707
if(if_index == AVAHI_IF_UNSPEC){
756
708
fprintf_plus(stderr, "An IPv6 link-local address is"
757
709
" incomplete without a network interface\n");
759
711
goto mandos_end;
760
712
}
761
713
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
to.in6.sin6_scope_id = (uint32_t)if_index;
763
715
}
764
716
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
766
720
}
767
721
768
722
if(quit_now){
776
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
731
perror_plus("if_indextoname");
778
732
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
781
735
}
782
736
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
785
739
}
786
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
788
743
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
793
746
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
798
749
}
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);
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
752
} else {
753
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
805
756
}
806
757
}
807
758
811
762
}
812
763
813
764
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
766
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
768
}
820
769
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
771
int e = errno;
823
772
perror_plus("connect");
824
773
errno = e;
870
819
goto mandos_end;
871
820
}
872
821
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);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
878
824
879
825
if(quit_now){
880
826
errno = EINTR;
985
931
if(buffer_length > 0){
986
932
ssize_t decrypted_buffer_size;
987
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
934
&decrypted_buffer);
989
935
if(decrypted_buffer_size >= 0){
990
936
991
937
written = 0;
1039
985
return retval;
1040
986
}
1041
987
1042
__attribute__((nonnull))
1043
988
static void resolve_callback(AvahiSServiceResolver *r,
1044
989
AvahiIfIndex interface,
1045
990
AvahiProtocol proto,
1053
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1000
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1060
1003
1061
1004
/* Called whenever a service has been resolved successfully or
1062
1005
timed out */
1071
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
1016
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
1017
avahi_strerror(avahi_server_errno(mc.server)));
1076
1018
break;
1077
1019
1078
1020
case AVAHI_RESOLVER_FOUND:
1084
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
1027
host_name, ip, (intmax_t)interface, port);
1086
1028
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1091
1031
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1032
avahi_simple_poll_quit(mc.simple_poll);
1093
1033
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1097
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
1037
" list\n", name);
1099
1038
}
1112
1051
const char *domain,
1113
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
1053
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1119
1056
1120
1057
/* Called whenever a new services becomes available on the LAN or
1121
1058
is removed from the LAN */
1129
1066
case AVAHI_BROWSER_FAILURE:
1130
1067
1131
1068
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);
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1135
1071
return;
1136
1072
1137
1073
case AVAHI_BROWSER_NEW:
1140
1076
the callback function is called the Avahi server will free the
1141
1077
resolver for us. */
1142
1078
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)
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1147
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
1083
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
1084
avahi_strerror(avahi_server_errno(mc.server)));
1151
1085
break;
1152
1086
1153
1087
case AVAHI_BROWSER_REMOVE:
1172
1106
signal_received = sig;
1173
1107
int old_errno = errno;
1174
1108
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1177
1111
}
1178
1112
errno = old_errno;
1179
1113
}
1180
1114
1181
__attribute__((nonnull, warn_unused_result))
1182
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
1116
int ret;
1184
error_t ret_errno;
1185
1117
1186
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
1119
if(s < 0){
1188
ret_errno = errno;
1189
1120
perror_plus("socket");
1190
errno = ret_errno;
1191
1121
return false;
1192
1122
}
1193
1123
strcpy(ifr->ifr_name, ifname);
1194
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
1125
if(ret == -1){
1196
1126
if(debug){
1197
ret_errno = errno;
1198
1127
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
1128
}
1201
1129
return false;
1202
1130
}
1203
1131
return true;
1204
1132
}
1205
1133
1206
__attribute__((nonnull, warn_unused_result))
1207
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1135
1209
1136
/* Reject the loopback device */
1251
1178
* corresponds to an acceptable network device.
1252
1179
* (This function is passed to scandir(3) as a filter function.)
1253
1180
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
1181
int good_interface(const struct dirent *if_entry){
1256
1182
if(if_entry->d_name[0] == '.'){
1257
1183
return 0;
1273
1199
}
1274
1200
1275
1201
/*
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))
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1310
1244
int notdotentries(const struct dirent *direntry){
1311
1245
/* Skip "." and ".." */
1312
1246
if(direntry->d_name[0] == '.'
1319
1253
}
1320
1254
1321
1255
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
1256
int runnable_hook(const struct dirent *direntry){
1324
1257
int ret;
1325
1258
size_t sret;
1380
1313
return 1;
1381
1314
}
1382
1315
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1317
int ret;
1387
1318
struct timespec now;
1388
1319
struct timespec waited_time;
1389
1320
intmax_t block_time;
1390
1321
1391
1322
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1323
if(mc.current_server == NULL){
1324
if (debug){
1394
1325
fprintf_plus(stderr, "Wait until first server is found."
1395
1326
" No timeout!\n");
1396
1327
}
1397
1328
ret = avahi_simple_poll_iterate(s, -1);
1398
1329
} else {
1399
if(debug){
1330
if (debug){
1400
1331
fprintf_plus(stderr, "Check current_server if we should run"
1401
1332
" it, or wait\n");
1402
1333
}
1409
1340
/* Calculating in ms how long time between now and server
1410
1341
who we visted longest time ago. Now - last seen. */
1411
1342
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1343
- mc.current_server->last_seen.tv_sec);
1413
1344
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1345
- mc.current_server->last_seen.tv_nsec);
1415
1346
/* total time is 10s/10,000ms.
1416
1347
Converting to s from ms by dividing by 1,000,
1417
1348
and ns to ms by dividing by 1,000,000. */
1419
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1352
1422
if(debug){
1353
if (debug){
1423
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
1355
block_time);
1425
1356
}
1426
1357
1427
1358
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);
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1432
1363
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1364
avahi_simple_poll_quit(mc.simple_poll);
1434
1365
return 0;
1435
1366
}
1436
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1368
&mc.current_server->last_seen);
1438
1369
if(ret == -1){
1439
1370
perror_plus("clock_gettime");
1440
1371
return -1;
1441
1372
}
1442
mc->current_server = mc->current_server->next;
1373
mc.current_server = mc.current_server->next;
1443
1374
block_time = 0; /* Call avahi to find new Mandos
1444
1375
servers, but don't block */
1445
1376
}
1447
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1379
}
1449
1380
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1381
if (ret > 0 or errno != EINTR){
1451
1382
return (ret != 1) ? ret : 0;
1452
1383
}
1453
1384
}
1454
1385
}
1455
1386
}
1456
1387
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,
1388
bool run_network_hooks(const char *mode, const char *interface,
1515
1389
const float delay){
1516
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1517
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
1394
alphasort);
1519
1395
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
}
1396
perror_plus("scandir");
1528
1397
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
1398
int devnull = open("/dev/null", O_RDONLY);
1532
1399
for(int i = 0; i < numhooks; i++){
1533
1400
direntry = direntries[i];
1545
1412
if(hook_pid == 0){
1546
1413
/* Child */
1547
1414
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1551
1425
}
1552
1426
/* Set group */
1553
1427
errno = 0;
1554
1428
ret = setgid(0);
1555
1429
if(ret == -1){
1556
1430
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
1431
}
1559
1432
/* Reset supplementary groups */
1560
1433
errno = 0;
1561
1434
ret = setgroups(0, NULL);
1562
1435
if(ret == -1){
1563
1436
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
}
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1581
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
1442
if(ret == -1){
1583
1443
perror_plus("setenv");
1588
1448
perror_plus("setenv");
1589
1449
_exit(EX_OSERR);
1590
1450
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1592
1452
if(ret == -1){
1593
1453
perror_plus("setenv");
1594
1454
_exit(EX_OSERR);
1599
1459
_exit(EX_OSERR);
1600
1460
}
1601
1461
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1462
ret = asprintf(&delaystring, "%f", delay);
1603
1463
if(ret == -1){
1604
1464
perror_plus("asprintf");
1605
1465
_exit(EX_OSERR);
1611
1471
_exit(EX_OSERR);
1612
1472
}
1613
1473
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
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
1475
perror_plus("execl");
1623
1476
_exit(EXIT_FAILURE);
1658
1511
}
1659
1512
close(devnull);
1660
1513
}
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;
1514
return true;
1859
1515
}
1860
1516
1861
1517
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
1518
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
1519
int error;
1868
1520
int ret;
1869
1521
intmax_t tmpmax;
1870
1522
char *tmp;
1871
1523
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1874
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1875
1531
bool tempdir_created = false;
1876
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
1533
const char *seckey = PATHDIR "/" SECKEY;
1878
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
1535
1881
1536
bool gnutls_initialized = false;
1882
1537
bool gpgme_initialized = false;
1944
1599
.group = 2 },
1945
1600
{ .name = "retry", .key = 132,
1946
1601
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1602
.doc = "Retry interval used when denied by the mandos server",
1948
1603
.group = 2 },
1949
1604
{ .name = "network-hook-dir", .key = 133,
1950
1605
.arg = "DIR",
1973
1628
connect_to = arg;
1974
1629
break;
1975
1630
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
}
1631
interface = arg;
1981
1632
break;
1982
1633
case 's': /* --seckey */
1983
1634
seckey = arg;
2060
1711
/* Work around Debian bug #633582:
2061
1712
<http://bugs.debian.org/633582> */
2062
1713
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");
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2068
1719
} else {
2069
1720
struct stat st;
2070
1721
2111
1762
}
2112
1763
2113
1764
/* 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;
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2135
1769
}
2136
1770
}
2137
1771
}
2138
1772
2139
1773
/* 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);
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2152
1776
}
2153
1777
2154
1778
if(not debug){
2155
1779
avahi_set_log_function(empty_log);
2156
1780
}
2157
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
2158
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2159
1815
from the signal handler */
2160
1816
/* Initialize the pseudo-RNG for Avahi */
2161
1817
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2164
1820
fprintf_plus(stderr,
2165
1821
"Avahi: Failed to create simple poll object.\n");
2166
1822
exitcode = EX_UNAVAILABLE;
2230
1886
}
2231
1887
}
2232
1888
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;
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
2280
1974
}
2281
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
2282
1993
break;
2283
1994
}
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);
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2311
2024
}
2312
2025
2313
2026
if(quit_now){
2314
2027
goto end;
2315
2028
}
2316
2029
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
ret = init_gnutls_global(pubkey, seckey);
2318
2031
if(ret == -1){
2319
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2320
2033
exitcode = EX_UNAVAILABLE;
2337
2050
goto end;
2338
2051
}
2339
2052
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2341
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2342
2055
exitcode = EX_UNAVAILABLE;
2343
2056
goto end;
2353
2066
/* Connect directly, do not use Zeroconf */
2354
2067
/* (Mainly meant for debugging) */
2355
2068
char *address = strrchr(connect_to, ':');
2356
2357
2069
if(address == NULL){
2358
2070
fprintf_plus(stderr, "No colon in address\n");
2359
2071
exitcode = EX_USAGE;
2364
2076
goto end;
2365
2077
}
2366
2078
2367
in_port_t port;
2079
uint16_t port;
2368
2080
errno = 0;
2369
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2370
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2083
or tmpmax != (uint16_t)tmpmax){
2372
2084
fprintf_plus(stderr, "Bad port number\n");
2373
2085
exitcode = EX_USAGE;
2374
2086
goto end;
2375
2087
}
2376
2088
2377
2089
if(quit_now){
2378
2090
goto end;
2379
2091
}
2380
2092
2381
port = (in_port_t)tmpmax;
2093
port = (uint16_t)tmpmax;
2382
2094
*address = '\0';
2383
2095
/* Colon in address indicates IPv6 */
2384
2096
int af;
2400
2112
}
2401
2113
2402
2114
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2115
ret = start_mandos_communication(address, port, if_index, af);
2405
2116
if(quit_now or ret == 0){
2406
2117
break;
2407
2118
}
2409
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
2121
(int)retry_interval);
2411
2122
}
2412
sleep((unsigned int)retry_interval);
2123
sleep((int)retry_interval);
2413
2124
}
2414
2125
2415
if(not quit_now){
2126
if (not quit_now){
2416
2127
exitcode = EXIT_SUCCESS;
2417
2128
}
2418
2129
2433
2144
config.publish_domain = 0;
2434
2145
2435
2146
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2438
2150
2439
2151
/* Free the Avahi configuration data */
2440
2152
avahi_server_config_free(&config);
2443
2155
/* Check if creating the Avahi server object succeeded */
2444
2156
if(mc.server == NULL){
2445
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
2158
avahi_strerror(error));
2447
2159
exitcode = EX_UNAVAILABLE;
2448
2160
goto end;
2449
2161
}
2455
2167
/* Create the Avahi service browser */
2456
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
2170
NULL, 0, browse_callback, NULL);
2460
2171
if(sb == NULL){
2461
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
2173
avahi_strerror(avahi_server_errno(mc.server)));
2474
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
2186
}
2476
2187
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2479
2190
if(debug){
2480
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
2192
(ret == 0) ? "successfully" : "with error");
2488
2199
}
2489
2200
2490
2201
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
2202
if(sb != NULL)
2494
2203
avahi_s_service_browser_free(sb);
2495
2204
2496
2205
if(mc.server != NULL)
2497
2206
avahi_server_free(mc.server);
2498
2207
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2501
2210
2502
2211
if(gnutls_initialized){
2503
2212
gnutls_certificate_free_credentials(mc.cred);
2520
2229
}
2521
2230
}
2522
2231
2523
/* Re-raise privileges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2524
2236
{
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);
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2241
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
}
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2560
2267
2561
2268
/* Removes the GPGME temp directory and all files inside */
2562
2269
if(tempdir_created){
2564
2271
struct dirent *direntry = NULL;
2565
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
2273
alphasort);
2567
if(numentries > 0){
2274
if (numentries > 0){
2568
2275
for(int i = 0; i < numentries; i++){
2569
2276
direntry = direntries[i];
2570
2277
char *fullname = NULL;
2585
2292
2586
2293
/* need to clean even if 0 because man page doesn't specify */
2587
2294
free(direntries);
2588
if(numentries == -1){
2295
if (numentries == -1){
2589
2296
perror_plus("scandir");
2590
2297
}
2591
2298
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0