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» Revision
237.7.217
(compared to revision 237.16.15)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:55:54 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140310065554-of3kz8jdhlll42l3
Use "struct sockaddr_storage" instead of a union in mandos-client.
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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 */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
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() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
137
146
138
147
/* Doubly linked list that need to be circularly linked when used */
139
148
typedef struct server{
140
149
const char *ip;
141
uint16_t port;
150
in_port_t port;
142
151
AvahiIfIndex if_index;
143
152
int af;
144
153
struct timespec last_seen;
148
157
149
158
/* Used for passing in values through the Avahi callback functions */
150
159
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
160
AvahiServer *server;
153
161
gnutls_certificate_credentials_t cred;
154
162
unsigned int dh_bits;
156
164
const char *priority;
157
165
gpgme_ctx_t ctx;
158
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
159
169
} mandos_context;
160
170
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
166
173
167
174
sig_atomic_t quit_now = 0;
168
175
int signal_received = 0;
169
176
170
177
/* Function to use when printing errors */
171
178
void perror_plus(const char *print_text){
179
int e = errno;
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
182
errno = e;
174
183
perror(print_text);
175
184
}
176
185
186
__attribute__((format (gnu_printf, 2, 3)))
177
187
int fprintf_plus(FILE *stream, const char *format, ...){
178
188
va_list ap;
179
189
va_start (ap, format);
180
190
181
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
192
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
194
}
185
195
186
196
/*
191
201
size_t incbuffer(char **buffer, size_t buffer_length,
192
202
size_t buffer_capacity){
193
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
196
210
return 0;
197
211
}
212
*buffer = new_buf;
198
213
buffer_capacity += BUFFER_SIZE;
199
214
}
200
215
return buffer_capacity;
201
216
}
202
217
203
218
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
206
221
int ret;
207
222
server *new_server = malloc(sizeof(server));
208
223
if(new_server == NULL){
209
224
perror_plus("malloc");
210
return -1;
225
return false;
211
226
}
212
227
*new_server = (server){ .ip = strdup(ip),
213
228
.port = port,
215
230
.af = af };
216
231
if(new_server->ip == NULL){
217
232
perror_plus("strdup");
218
return -1;
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
219
239
}
220
240
/* Special case of first server */
221
if (mc.current_server == NULL){
241
if(*current_server == NULL){
222
242
new_server->next = new_server;
223
243
new_server->prev = new_server;
224
mc.current_server = new_server;
244
*current_server = new_server;
225
245
/* Place the new server last in the list */
226
246
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
229
249
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
250
(*current_server)->prev = new_server;
251
}
252
return true;
238
253
}
239
254
240
255
/*
241
256
* Initialize GPGME.
242
257
*/
243
258
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
259
const char *tempdir, mandos_context *mc){
245
260
gpgme_error_t rc;
246
261
gpgme_engine_info_t engine_info;
247
262
248
249
263
/*
250
264
* Helper function to insert pub and seckey to the engine keyring.
251
265
*/
267
281
return false;
268
282
}
269
283
270
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
271
285
if(rc != GPG_ERR_NO_ERROR){
272
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
287
gpgme_strsource(rc), gpgme_strerror(rc));
317
331
}
318
332
319
333
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
321
335
if(rc != GPG_ERR_NO_ERROR){
322
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
352
*/
339
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
354
size_t crypto_size,
341
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
342
357
gpgme_data_t dh_crypto, dh_plain;
343
358
gpgme_error_t rc;
344
359
ssize_t ret;
370
385
371
386
/* Decrypt data from the cryptotext data buffer to the plaintext
372
387
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
389
if(rc != GPG_ERR_NO_ERROR){
375
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
391
gpgme_strsource(rc), gpgme_strerror(rc));
377
392
plaintext_length = -1;
378
393
if(debug){
379
394
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
381
396
if(result == NULL){
382
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
398
} else {
461
476
}
462
477
463
478
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
466
480
if(ret == NULL)
467
481
ret = "(unknown)";
468
482
return ret;
475
489
}
476
490
477
491
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
479
494
int ret;
480
495
481
496
if(debug){
498
513
}
499
514
500
515
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
517
if(ret != GNUTLS_E_SUCCESS){
503
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
519
safer_gnutls_strerror(ret));
514
529
}
515
530
516
531
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
518
533
GNUTLS_OPENPGP_FMT_BASE64);
519
534
if(ret != GNUTLS_E_SUCCESS){
520
535
fprintf_plus(stderr,
526
541
}
527
542
528
543
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
530
545
if(ret != GNUTLS_E_SUCCESS){
531
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
547
" initialization: %s\n",
533
548
safer_gnutls_strerror(ret));
534
549
goto globalfail;
535
550
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
552
if(ret != GNUTLS_E_SUCCESS){
538
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
554
safer_gnutls_strerror(ret));
540
555
goto globalfail;
541
556
}
542
557
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
559
545
560
return 0;
546
561
547
562
globalfail:
548
563
549
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
550
565
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
552
567
return -1;
553
568
}
554
569
555
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
556
572
int ret;
557
573
/* GnuTLS session creation */
558
574
do {
570
586
{
571
587
const char *err;
572
588
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
590
if(quit_now){
575
591
gnutls_deinit(*session);
576
592
return -1;
587
603
588
604
do {
589
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
606
mc->cred);
591
607
if(quit_now){
592
608
gnutls_deinit(*session);
593
609
return -1;
603
619
/* ignore client certificate if any. */
604
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
621
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
623
608
624
return 0;
609
625
}
613
629
__attribute__((unused)) const char *txt){}
614
630
615
631
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
617
633
AvahiIfIndex if_index,
618
int af){
634
int af, mandos_context *mc){
619
635
int ret, tcp_sd = -1;
620
636
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
637
struct sockaddr_storage to;
625
638
char *buffer = NULL;
626
639
char *decrypted_buffer = NULL;
627
640
size_t buffer_length = 0;
651
664
return -1;
652
665
}
653
666
654
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
655
700
if(ret != 0){
656
701
return -1;
657
702
}
658
703
659
704
if(debug){
660
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
706
PRIuMAX "\n", ip, (uintmax_t)port);
662
707
}
663
708
664
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
676
721
677
722
memset(&to, 0, sizeof(to));
678
723
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
681
726
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
684
729
}
685
730
if(ret < 0 ){
686
731
int e = errno;
695
740
goto mandos_end;
696
741
}
697
742
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
746
if(if_index == AVAHI_IF_UNSPEC){
706
747
fprintf_plus(stderr, "An IPv6 link-local address is"
707
748
" incomplete without a network interface\n");
709
750
goto mandos_end;
710
751
}
711
752
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
754
}
714
755
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
757
}
719
758
720
759
if(quit_now){
728
767
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
768
perror_plus("if_indextoname");
730
769
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
733
772
}
734
773
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
737
776
}
738
777
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
778
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
779
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
744
784
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
747
789
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
796
}
755
797
}
756
798
760
802
}
761
803
762
804
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
764
807
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
766
810
}
767
811
if(ret < 0){
768
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
817
861
goto mandos_end;
818
862
}
819
863
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
869
823
870
if(quit_now){
824
871
errno = EINTR;
929
976
if(buffer_length > 0){
930
977
ssize_t decrypted_buffer_size;
931
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
979
&decrypted_buffer, mc);
933
980
if(decrypted_buffer_size >= 0){
934
981
935
982
written = 0;
996
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1045
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
1001
1050
1002
1051
/* Called whenever a service has been resolved successfully or
1003
1052
timed out */
1012
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1063
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
1016
1066
break;
1017
1067
1018
1068
case AVAHI_RESOLVER_FOUND:
1024
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1075
host_name, ip, (intmax_t)interface, port);
1026
1076
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1029
1081
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1082
avahi_simple_poll_quit(simple_poll);
1031
1083
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
1034
1090
}
1035
1091
}
1036
1092
}
1046
1102
const char *domain,
1047
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1104
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1051
1109
1052
1110
/* Called whenever a new services becomes available on the LAN or
1053
1111
is removed from the LAN */
1061
1119
case AVAHI_BROWSER_FAILURE:
1062
1120
1063
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1066
1125
return;
1067
1126
1068
1127
case AVAHI_BROWSER_NEW:
1071
1130
the callback function is called the Avahi server will free the
1072
1131
resolver for us. */
1073
1132
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1077
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1138
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1080
1141
break;
1081
1142
1082
1143
case AVAHI_BROWSER_REMOVE:
1101
1162
signal_received = sig;
1102
1163
int old_errno = errno;
1103
1164
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1106
1167
}
1107
1168
errno = old_errno;
1108
1169
}
1109
1170
1110
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1172
int ret;
1173
error_t ret_errno;
1112
1174
1113
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1176
if(s < 0){
1177
ret_errno = errno;
1115
1178
perror_plus("socket");
1179
errno = ret_errno;
1116
1180
return false;
1117
1181
}
1118
1182
strcpy(ifr->ifr_name, ifname);
1119
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1184
if(ret == -1){
1121
1185
if(debug){
1186
ret_errno = errno;
1122
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1123
1189
}
1124
1190
return false;
1125
1191
}
1194
1260
}
1195
1261
1196
1262
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(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_RUNNING);
1237
1292
}
1238
1293
1239
1294
int notdotentries(const struct dirent *direntry){
1308
1363
return 1;
1309
1364
}
1310
1365
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1312
1368
int ret;
1313
1369
struct timespec now;
1314
1370
struct timespec waited_time;
1315
1371
intmax_t block_time;
1316
1372
1317
1373
while(true){
1318
if(mc.current_server == NULL){
1374
if(mc->current_server == NULL){
1319
1375
if (debug){
1320
1376
fprintf_plus(stderr, "Wait until first server is found."
1321
1377
" No timeout!\n");
1335
1391
/* Calculating in ms how long time between now and server
1336
1392
who we visted longest time ago. Now - last seen. */
1337
1393
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1394
- mc->current_server->last_seen.tv_sec);
1339
1395
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1396
- mc->current_server->last_seen.tv_nsec);
1341
1397
/* total time is 10s/10,000ms.
1342
1398
Converting to s from ms by dividing by 1,000,
1343
1399
and ns to ms by dividing by 1,000,000. */
1351
1407
}
1352
1408
1353
1409
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1358
1414
if(ret == 0){
1359
avahi_simple_poll_quit(mc.simple_poll);
1415
avahi_simple_poll_quit(s);
1360
1416
return 0;
1361
1417
}
1362
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1419
&mc->current_server->last_seen);
1364
1420
if(ret == -1){
1365
1421
perror_plus("clock_gettime");
1366
1422
return -1;
1367
1423
}
1368
mc.current_server = mc.current_server->next;
1424
mc->current_server = mc->current_server->next;
1369
1425
block_time = 0; /* Call avahi to find new Mandos
1370
1426
servers, but don't block */
1371
1427
}
1380
1436
}
1381
1437
}
1382
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1383
1491
bool run_network_hooks(const char *mode, const char *interface,
1384
1492
const float delay){
1385
1493
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
1495
alphasort);
1390
1496
if(numhooks == -1){
1391
perror_plus("scandir");
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1392
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1393
1508
int devnull = open("/dev/null", O_RDONLY);
1394
1509
for(int i = 0; i < numhooks; i++){
1395
1510
direntry = direntries[i];
1406
1521
pid_t hook_pid = fork();
1407
1522
if(hook_pid == 0){
1408
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1409
1538
dup2(devnull, STDIN_FILENO);
1410
1539
close(devnull);
1411
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1419
1548
perror_plus("setenv");
1420
1549
_exit(EX_OSERR);
1421
1550
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1423
1552
if(ret == -1){
1424
1553
perror_plus("setenv");
1425
1554
_exit(EX_OSERR);
1442
1571
_exit(EX_OSERR);
1443
1572
}
1444
1573
free(delaystring);
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1447
1585
} else {
1448
1586
int status;
1449
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1483
1621
return true;
1484
1622
}
1485
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1486
1794
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1487
1799
AvahiSServiceBrowser *sb = NULL;
1488
int error;
1800
error_t ret_errno;
1489
1801
int ret;
1490
1802
intmax_t tmpmax;
1491
1803
char *tmp;
1492
1804
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1499
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1500
1808
bool tempdir_created = false;
1501
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1502
1810
const char *seckey = PATHDIR "/" SECKEY;
1503
1811
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1504
1813
1505
1814
bool gnutls_initialized = false;
1506
1815
bool gpgme_initialized = false;
1568
1877
.group = 2 },
1569
1878
{ .name = "retry", .key = 132,
1570
1879
.arg = "SECONDS",
1571
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1572
1881
.group = 2 },
1573
1882
{ .name = "network-hook-dir", .key = 133,
1574
1883
.arg = "DIR",
1597
1906
connect_to = arg;
1598
1907
break;
1599
1908
case 'i': /* --interface */
1600
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1601
1914
break;
1602
1915
case 's': /* --seckey */
1603
1916
seckey = arg;
1646
1959
argp_state_help(state, state->out_stream,
1647
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
1961
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
1963
exit(argp_err_exit_status);
1653
1964
break;
1678
1989
}
1679
1990
}
1680
1991
1681
if(getuid() == 0){
1992
{
1682
1993
/* Work around Debian bug #633582:
1683
1994
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1995
1686
1996
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
1740
2061
}
1741
2062
}
1742
2063
1743
2064
/* Run network hooks */
1744
2065
{
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
1751
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1752
2074
}
1753
if(not run_network_hooks("start", interface, delay)){
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
1754
2077
goto end;
1755
2078
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
1764
2079
}
1765
2080
1766
2081
if(not debug){
1767
2082
avahi_set_log_function(empty_log);
1768
2083
}
1769
2084
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
1802
2085
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
2086
from the signal handler */
1804
2087
/* Initialize the pseudo-RNG for Avahi */
1805
2088
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
1808
2091
fprintf_plus(stderr,
1809
2092
"Avahi: Failed to create simple poll object.\n");
1810
2093
exitcode = EX_UNAVAILABLE;
1874
2157
}
1875
2158
}
1876
2159
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
1962
2207
}
1963
2208
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
1981
2209
break;
1982
2210
}
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2240
}
2013
2241
2014
2242
if(quit_now){
2015
2243
goto end;
2016
2244
}
2017
2245
2018
ret = init_gnutls_global(pubkey, seckey);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2019
2247
if(ret == -1){
2020
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
2249
exitcode = EX_UNAVAILABLE;
2038
2266
goto end;
2039
2267
}
2040
2268
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2042
2270
fprintf_plus(stderr, "init_gpgme failed\n");
2043
2271
exitcode = EX_UNAVAILABLE;
2044
2272
goto end;
2054
2282
/* Connect directly, do not use Zeroconf */
2055
2283
/* (Mainly meant for debugging) */
2056
2284
char *address = strrchr(connect_to, ':');
2285
2057
2286
if(address == NULL){
2058
2287
fprintf_plus(stderr, "No colon in address\n");
2059
2288
exitcode = EX_USAGE;
2064
2293
goto end;
2065
2294
}
2066
2295
2067
uint16_t port;
2296
in_port_t port;
2068
2297
errno = 0;
2069
2298
tmpmax = strtoimax(address+1, &tmp, 10);
2070
2299
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2300
or tmpmax != (in_port_t)tmpmax){
2072
2301
fprintf_plus(stderr, "Bad port number\n");
2073
2302
exitcode = EX_USAGE;
2074
2303
goto end;
2075
2304
}
2076
2305
2077
2306
if(quit_now){
2078
2307
goto end;
2079
2308
}
2080
2309
2081
port = (uint16_t)tmpmax;
2310
port = (in_port_t)tmpmax;
2082
2311
*address = '\0';
2083
2312
/* Colon in address indicates IPv6 */
2084
2313
int af;
2100
2329
}
2101
2330
2102
2331
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2104
2334
if(quit_now or ret == 0){
2105
2335
break;
2106
2336
}
2108
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
2339
(int)retry_interval);
2110
2340
}
2111
sleep((int)retry_interval);
2341
sleep((unsigned int)retry_interval);
2112
2342
}
2113
2343
2114
2344
if (not quit_now){
2132
2362
config.publish_domain = 0;
2133
2363
2134
2364
/* Allocate a new server */
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2138
2367
2139
2368
/* Free the Avahi configuration data */
2140
2369
avahi_server_config_free(&config);
2143
2372
/* Check if creating the Avahi server object succeeded */
2144
2373
if(mc.server == NULL){
2145
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2375
avahi_strerror(ret_errno));
2147
2376
exitcode = EX_UNAVAILABLE;
2148
2377
goto end;
2149
2378
}
2155
2384
/* Create the Avahi service browser */
2156
2385
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
2386
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2158
NULL, 0, browse_callback, NULL);
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2159
2389
if(sb == NULL){
2160
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
2391
avahi_strerror(avahi_server_errno(mc.server)));
2173
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2174
2404
}
2175
2405
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2178
2408
if(debug){
2179
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
2410
(ret == 0) ? "successfully" : "with error");
2187
2417
}
2188
2418
2189
2419
/* Cleanup things */
2420
free(mc.interfaces);
2421
2190
2422
if(sb != NULL)
2191
2423
avahi_s_service_browser_free(sb);
2192
2424
2193
2425
if(mc.server != NULL)
2194
2426
avahi_server_free(mc.server);
2195
2427
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2198
2430
2199
2431
if(gnutls_initialized){
2200
2432
gnutls_certificate_free_credentials(mc.cred);
2219
2451
2220
2452
/* Re-raise priviliges */
2221
2453
{
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2454
raise_privileges();
2229
2455
2230
2456
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2232
2459
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2243
2470
}
2244
2471
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2248
2475
}
2249
2476
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2477
2478
lower_privileges_permanently();
2479
}
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2259
2483
2260
2484
/* Removes the GPGME temp directory and all files inside */
2261
2485
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0