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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
- 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))
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
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
265
247
gpgme_error_t rc;
266
248
gpgme_engine_info_t engine_info;
267
249
250
268
251
/*
269
252
* Helper function to insert pub and seckey to the engine keyring.
270
253
*/
271
bool import_key(const char * const filename){
254
bool import_key(const char *filename){
272
255
int ret;
273
256
int fd;
274
257
gpgme_data_t pgp_data;
286
269
return false;
287
270
}
288
271
289
rc = gpgme_op_import(mc->ctx, pgp_data);
272
rc = gpgme_op_import(mc.ctx, pgp_data);
290
273
if(rc != GPG_ERR_NO_ERROR){
291
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
275
gpgme_strsource(rc), gpgme_strerror(rc));
336
319
}
337
320
338
321
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
322
rc = gpgme_new(&(mc.ctx));
340
323
if(rc != GPG_ERR_NO_ERROR){
341
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
338
* Decrypt OpenPGP data.
356
339
* Returns -1 on error
357
340
*/
358
__attribute__((nonnull, warn_unused_result))
359
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
342
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
343
char **plaintext){
363
344
gpgme_data_t dh_crypto, dh_plain;
364
345
gpgme_error_t rc;
365
346
ssize_t ret;
391
372
392
373
/* Decrypt data from the cryptotext data buffer to the plaintext
393
374
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
376
if(rc != GPG_ERR_NO_ERROR){
396
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
378
gpgme_strsource(rc), gpgme_strerror(rc));
398
379
plaintext_length = -1;
399
380
if(debug){
400
381
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
382
result = gpgme_op_decrypt_result(mc.ctx);
402
383
if(result == NULL){
403
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
385
} else {
481
462
return plaintext_length;
482
463
}
483
464
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
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 */
487
468
if(ret == NULL)
488
469
ret = "(unknown)";
489
470
return ret;
490
471
}
491
472
492
473
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
474
static void debuggnutls(__attribute__((unused)) int level,
495
475
const char* string){
496
476
fprintf_plus(stderr, "GnuTLS: %s", string);
497
477
}
498
478
499
__attribute__((nonnull, warn_unused_result))
500
479
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
480
const char *seckeyfilename){
503
481
int ret;
504
482
505
483
if(debug){
522
500
}
523
501
524
502
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
504
if(ret != GNUTLS_E_SUCCESS){
527
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
506
safer_gnutls_strerror(ret));
538
516
}
539
517
540
518
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
542
520
GNUTLS_OPENPGP_FMT_BASE64);
543
521
if(ret != GNUTLS_E_SUCCESS){
544
522
fprintf_plus(stderr,
550
528
}
551
529
552
530
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
531
ret = gnutls_dh_params_init(&mc.dh_params);
554
532
if(ret != GNUTLS_E_SUCCESS){
555
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
534
" initialization: %s\n",
557
535
safer_gnutls_strerror(ret));
558
536
goto globalfail;
559
537
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
539
if(ret != GNUTLS_E_SUCCESS){
562
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
541
safer_gnutls_strerror(ret));
564
542
goto globalfail;
565
543
}
566
544
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
546
569
547
return 0;
570
548
571
549
globalfail:
572
550
573
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
574
552
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_dh_params_deinit(mc.dh_params);
576
554
return -1;
577
555
}
578
556
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
557
static int init_gnutls_session(gnutls_session_t *session){
582
558
int ret;
583
559
/* GnuTLS session creation */
584
560
do {
596
572
{
597
573
const char *err;
598
574
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
576
if(quit_now){
601
577
gnutls_deinit(*session);
602
578
return -1;
613
589
614
590
do {
615
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
592
mc.cred);
617
593
if(quit_now){
618
594
gnutls_deinit(*session);
619
595
return -1;
629
605
/* ignore client certificate if any. */
630
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
607
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
609
634
610
return 0;
635
611
}
639
615
__attribute__((unused)) const char *txt){}
640
616
641
617
/* 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,
618
static int start_mandos_communication(const char *ip, uint16_t port,
644
619
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
620
int af){
646
621
int ret, tcp_sd = -1;
647
622
ssize_t sret;
648
struct sockaddr_storage to;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
649
627
char *buffer = NULL;
650
628
char *decrypted_buffer = NULL;
651
629
size_t buffer_length = 0;
675
653
return -1;
676
654
}
677
655
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);
656
ret = init_gnutls_session(&session);
711
657
if(ret != 0){
712
658
return -1;
713
659
}
714
660
715
661
if(debug){
716
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
663
PRIu16 "\n", ip, port);
718
664
}
719
665
720
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
678
733
679
memset(&to, 0, sizeof(to));
734
680
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);
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
683
} 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);
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
740
686
}
741
687
if(ret < 0 ){
742
688
int e = errno;
751
697
goto mandos_end;
752
698
}
753
699
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)){
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*/
757
707
if(if_index == AVAHI_IF_UNSPEC){
758
708
fprintf_plus(stderr, "An IPv6 link-local address is"
759
709
" incomplete without a network interface\n");
761
711
goto mandos_end;
762
712
}
763
713
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
to.in6.sin6_scope_id = (uint32_t)if_index;
765
715
}
766
716
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
768
720
}
769
721
770
722
if(quit_now){
778
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
731
perror_plus("if_indextoname");
780
732
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
783
735
}
784
736
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
787
739
}
788
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
790
743
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
795
746
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
800
749
}
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);
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
}
807
756
}
808
757
}
809
758
813
762
}
814
763
815
764
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
766
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
768
}
822
769
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
771
int e = errno;
825
772
perror_plus("connect");
826
773
errno = e;
872
819
goto mandos_end;
873
820
}
874
821
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);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
824
881
825
if(quit_now){
882
826
errno = EINTR;
987
931
if(buffer_length > 0){
988
932
ssize_t decrypted_buffer_size;
989
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
934
&decrypted_buffer);
991
935
if(decrypted_buffer_size >= 0){
992
936
993
937
written = 0;
1041
985
return retval;
1042
986
}
1043
987
1044
__attribute__((nonnull))
1045
988
static void resolve_callback(AvahiSServiceResolver *r,
1046
989
AvahiIfIndex interface,
1047
990
AvahiProtocol proto,
1055
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
1000
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1062
1003
1063
1004
/* Called whenever a service has been resolved successfully or
1064
1005
timed out */
1073
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
1016
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1017
avahi_strerror(avahi_server_errno(mc.server)));
1078
1018
break;
1079
1019
1080
1020
case AVAHI_RESOLVER_FOUND:
1086
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
1027
host_name, ip, (intmax_t)interface, port);
1088
1028
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1093
1031
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1032
avahi_simple_poll_quit(mc.simple_poll);
1095
1033
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1099
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
1037
" list\n", name);
1101
1038
}
1114
1051
const char *domain,
1115
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1053
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1121
1056
1122
1057
/* Called whenever a new services becomes available on the LAN or
1123
1058
is removed from the LAN */
1131
1066
case AVAHI_BROWSER_FAILURE:
1132
1067
1133
1068
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);
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1137
1071
return;
1138
1072
1139
1073
case AVAHI_BROWSER_NEW:
1142
1076
the callback function is called the Avahi server will free the
1143
1077
resolver for us. */
1144
1078
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)
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1149
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
1083
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1084
avahi_strerror(avahi_server_errno(mc.server)));
1153
1085
break;
1154
1086
1155
1087
case AVAHI_BROWSER_REMOVE:
1174
1106
signal_received = sig;
1175
1107
int old_errno = errno;
1176
1108
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1179
1111
}
1180
1112
errno = old_errno;
1181
1113
}
1182
1114
1183
__attribute__((nonnull, warn_unused_result))
1184
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1116
int ret;
1186
error_t ret_errno;
1187
1117
1188
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1119
if(s < 0){
1190
ret_errno = errno;
1191
1120
perror_plus("socket");
1192
errno = ret_errno;
1193
1121
return false;
1194
1122
}
1195
1123
strcpy(ifr->ifr_name, ifname);
1196
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1125
if(ret == -1){
1198
1126
if(debug){
1199
ret_errno = errno;
1200
1127
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1128
}
1203
1129
return false;
1204
1130
}
1205
1131
return true;
1206
1132
}
1207
1133
1208
__attribute__((nonnull, warn_unused_result))
1209
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1135
1211
1136
/* Reject the loopback device */
1253
1178
* corresponds to an acceptable network device.
1254
1179
* (This function is passed to scandir(3) as a filter function.)
1255
1180
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1181
int good_interface(const struct dirent *if_entry){
1258
1182
if(if_entry->d_name[0] == '.'){
1259
1183
return 0;
1275
1199
}
1276
1200
1277
1201
/*
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))
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
1312
1244
int notdotentries(const struct dirent *direntry){
1313
1245
/* Skip "." and ".." */
1314
1246
if(direntry->d_name[0] == '.'
1321
1253
}
1322
1254
1323
1255
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1256
int runnable_hook(const struct dirent *direntry){
1326
1257
int ret;
1327
1258
size_t sret;
1382
1313
return 1;
1383
1314
}
1384
1315
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1388
1317
int ret;
1389
1318
struct timespec now;
1390
1319
struct timespec waited_time;
1391
1320
intmax_t block_time;
1392
1321
1393
1322
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1323
if(mc.current_server == NULL){
1324
if (debug){
1396
1325
fprintf_plus(stderr, "Wait until first server is found."
1397
1326
" No timeout!\n");
1398
1327
}
1399
1328
ret = avahi_simple_poll_iterate(s, -1);
1400
1329
} else {
1401
if(debug){
1330
if (debug){
1402
1331
fprintf_plus(stderr, "Check current_server if we should run"
1403
1332
" it, or wait\n");
1404
1333
}
1411
1340
/* Calculating in ms how long time between now and server
1412
1341
who we visted longest time ago. Now - last seen. */
1413
1342
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1343
- mc.current_server->last_seen.tv_sec);
1415
1344
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1345
- mc.current_server->last_seen.tv_nsec);
1417
1346
/* total time is 10s/10,000ms.
1418
1347
Converting to s from ms by dividing by 1,000,
1419
1348
and ns to ms by dividing by 1,000,000. */
1421
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1422
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1352
1424
if(debug){
1353
if (debug){
1425
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
1355
block_time);
1427
1356
}
1428
1357
1429
1358
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);
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);
1434
1363
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1364
avahi_simple_poll_quit(mc.simple_poll);
1436
1365
return 0;
1437
1366
}
1438
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1368
&mc.current_server->last_seen);
1440
1369
if(ret == -1){
1441
1370
perror_plus("clock_gettime");
1442
1371
return -1;
1443
1372
}
1444
mc->current_server = mc->current_server->next;
1373
mc.current_server = mc.current_server->next;
1445
1374
block_time = 0; /* Call avahi to find new Mandos
1446
1375
servers, but don't block */
1447
1376
}
1449
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
1379
}
1451
1380
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1381
if (ret > 0 or errno != EINTR){
1453
1382
return (ret != 1) ? ret : 0;
1454
1383
}
1455
1384
}
1456
1385
}
1457
1386
}
1458
1387
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,
1388
bool run_network_hooks(const char *mode, const char *interface,
1517
1389
const float delay){
1518
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1519
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
1394
alphasort);
1521
1395
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
}
1396
perror_plus("scandir");
1530
1397
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
1398
int devnull = open("/dev/null", O_RDONLY);
1534
1399
for(int i = 0; i < numhooks; i++){
1535
1400
direntry = direntries[i];
1547
1412
if(hook_pid == 0){
1548
1413
/* Child */
1549
1414
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_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");
1553
1425
}
1554
1426
/* Set group */
1555
1427
errno = 0;
1556
1428
ret = setgid(0);
1557
1429
if(ret == -1){
1558
1430
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
1431
}
1561
1432
/* Reset supplementary groups */
1562
1433
errno = 0;
1563
1434
ret = setgroups(0, NULL);
1564
1435
if(ret == -1){
1565
1436
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
}
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
1442
if(ret == -1){
1585
1443
perror_plus("setenv");
1590
1448
perror_plus("setenv");
1591
1449
_exit(EX_OSERR);
1592
1450
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1594
1452
if(ret == -1){
1595
1453
perror_plus("setenv");
1596
1454
_exit(EX_OSERR);
1601
1459
_exit(EX_OSERR);
1602
1460
}
1603
1461
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1462
ret = asprintf(&delaystring, "%f", delay);
1605
1463
if(ret == -1){
1606
1464
perror_plus("asprintf");
1607
1465
_exit(EX_OSERR);
1613
1471
_exit(EX_OSERR);
1614
1472
}
1615
1473
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
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
1475
perror_plus("execl");
1625
1476
_exit(EXIT_FAILURE);
1660
1511
}
1661
1512
close(devnull);
1662
1513
}
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;
1514
return true;
1863
1515
}
1864
1516
1865
1517
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
1518
AvahiSServiceBrowser *sb = NULL;
1871
error_t ret_errno;
1519
int error;
1872
1520
int ret;
1873
1521
intmax_t tmpmax;
1874
1522
char *tmp;
1875
1523
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;
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;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
1881
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
1533
const char *seckey = PATHDIR "/" SECKEY;
1883
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1885
1535
1886
1536
bool gnutls_initialized = false;
1887
1537
bool gpgme_initialized = false;
1949
1599
.group = 2 },
1950
1600
{ .name = "retry", .key = 132,
1951
1601
.arg = "SECONDS",
1952
.doc = "Retry interval used when denied by the Mandos server",
1602
.doc = "Retry interval used when denied by the mandos server",
1953
1603
.group = 2 },
1954
1604
{ .name = "network-hook-dir", .key = 133,
1955
1605
.arg = "DIR",
1978
1628
connect_to = arg;
1979
1629
break;
1980
1630
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
}
1631
interface = arg;
1986
1632
break;
1987
1633
case 's': /* --seckey */
1988
1634
seckey = arg;
2065
1711
/* Work around Debian bug #633582:
2066
1712
<http://bugs.debian.org/633582> */
2067
1713
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");
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2073
1719
} else {
2074
1720
struct stat st;
2075
1721
2116
1762
}
2117
1763
2118
1764
/* 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;
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2140
1769
}
2141
1770
}
2142
1771
}
2143
1772
2144
1773
/* 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);
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2157
1776
}
2158
1777
2159
1778
if(not debug){
2160
1779
avahi_set_log_function(empty_log);
2161
1780
}
2162
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
2163
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
1815
from the signal handler */
2165
1816
/* Initialize the pseudo-RNG for Avahi */
2166
1817
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2169
1820
fprintf_plus(stderr,
2170
1821
"Avahi: Failed to create simple poll object.\n");
2171
1822
exitcode = EX_UNAVAILABLE;
2235
1886
}
2236
1887
}
2237
1888
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;
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");
2285
1974
}
2286
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){
2287
1993
break;
2288
1994
}
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);
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
}
2316
2024
}
2317
2025
2318
2026
if(quit_now){
2319
2027
goto end;
2320
2028
}
2321
2029
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
ret = init_gnutls_global(pubkey, seckey);
2323
2031
if(ret == -1){
2324
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
2033
exitcode = EX_UNAVAILABLE;
2332
2040
goto end;
2333
2041
}
2334
2042
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){
2043
if(mkdtemp(tempdir) == NULL){
2345
2044
perror_plus("mkdtemp");
2346
2045
goto end;
2347
2046
}
2047
tempdir_created = true;
2348
2048
2349
2049
if(quit_now){
2350
2050
goto end;
2351
2051
}
2352
2052
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2354
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2355
2055
exitcode = EX_UNAVAILABLE;
2356
2056
goto end;
2366
2066
/* Connect directly, do not use Zeroconf */
2367
2067
/* (Mainly meant for debugging) */
2368
2068
char *address = strrchr(connect_to, ':');
2369
2370
2069
if(address == NULL){
2371
2070
fprintf_plus(stderr, "No colon in address\n");
2372
2071
exitcode = EX_USAGE;
2377
2076
goto end;
2378
2077
}
2379
2078
2380
in_port_t port;
2079
uint16_t port;
2381
2080
errno = 0;
2382
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2383
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2083
or tmpmax != (uint16_t)tmpmax){
2385
2084
fprintf_plus(stderr, "Bad port number\n");
2386
2085
exitcode = EX_USAGE;
2387
2086
goto end;
2388
2087
}
2389
2088
2390
2089
if(quit_now){
2391
2090
goto end;
2392
2091
}
2393
2092
2394
port = (in_port_t)tmpmax;
2093
port = (uint16_t)tmpmax;
2395
2094
*address = '\0';
2396
2095
/* Colon in address indicates IPv6 */
2397
2096
int af;
2413
2112
}
2414
2113
2415
2114
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2115
ret = start_mandos_communication(address, port, if_index, af);
2418
2116
if(quit_now or ret == 0){
2419
2117
break;
2420
2118
}
2422
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
2121
(int)retry_interval);
2424
2122
}
2425
sleep((unsigned int)retry_interval);
2123
sleep((int)retry_interval);
2426
2124
}
2427
2125
2428
if(not quit_now){
2126
if (not quit_now){
2429
2127
exitcode = EXIT_SUCCESS;
2430
2128
}
2431
2129
2446
2144
config.publish_domain = 0;
2447
2145
2448
2146
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2451
2150
2452
2151
/* Free the Avahi configuration data */
2453
2152
avahi_server_config_free(&config);
2456
2155
/* Check if creating the Avahi server object succeeded */
2457
2156
if(mc.server == NULL){
2458
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2158
avahi_strerror(error));
2460
2159
exitcode = EX_UNAVAILABLE;
2461
2160
goto end;
2462
2161
}
2468
2167
/* Create the Avahi service browser */
2469
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2170
NULL, 0, browse_callback, NULL);
2473
2171
if(sb == NULL){
2474
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
2173
avahi_strerror(avahi_server_errno(mc.server)));
2487
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2488
2186
}
2489
2187
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2492
2190
if(debug){
2493
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
2192
(ret == 0) ? "successfully" : "with error");
2501
2199
}
2502
2200
2503
2201
/* Cleanup things */
2504
free(mc.interfaces);
2505
2506
2202
if(sb != NULL)
2507
2203
avahi_s_service_browser_free(sb);
2508
2204
2509
2205
if(mc.server != NULL)
2510
2206
avahi_server_free(mc.server);
2511
2207
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2514
2210
2515
2211
if(gnutls_initialized){
2516
2212
gnutls_certificate_free_credentials(mc.cred);
2533
2229
}
2534
2230
}
2535
2231
2536
/* Re-raise privileges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2537
2236
{
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
}
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2564
2241
}
2565
2242
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
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
}
2569
2259
}
2570
2260
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2574
2267
2575
2268
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2269
if(tempdir_created){
2577
2270
struct dirent **direntries = NULL;
2578
2271
struct dirent *direntry = NULL;
2579
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
2273
alphasort);
2581
if(numentries > 0){
2274
if (numentries > 0){
2582
2275
for(int i = 0; i < numentries; i++){
2583
2276
direntry = direntries[i];
2584
2277
char *fullname = NULL;
2599
2292
2600
2293
/* need to clean even if 0 because man page doesn't specify */
2601
2294
free(direntries);
2602
if(numentries == -1){
2295
if (numentries == -1){
2603
2296
perror_plus("scandir");
2604
2297
}
2605
2298
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0