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- Committer: Teddy Hogeborn
- Date: 2012-06-01 21:48:12 UTC
- mto: (237.7.144 trunk) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120601214812-g7685v5oeiuhi2qw
* debian/copyright (Copyright): Join the two lines to one line.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
- files removed:
- debian/upstream
- files modified:
- INSTALL
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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
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;
183
177
perror(print_text);
184
178
}
185
179
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
187
181
int fprintf_plus(FILE *stream, const char *format, ...){
188
182
va_list ap;
189
183
va_start (ap, format);
190
184
191
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
186
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
188
}
195
189
196
190
/*
198
192
* bytes. "buffer_capacity" is how much is currently allocated,
199
193
* "buffer_length" is how much is already used.
200
194
*/
201
__attribute__((nonnull, warn_unused_result))
202
195
size_t incbuffer(char **buffer, size_t buffer_length,
203
196
size_t buffer_capacity){
204
197
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;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
211
200
return 0;
212
201
}
213
*buffer = new_buf;
214
202
buffer_capacity += BUFFER_SIZE;
215
203
}
216
204
return buffer_capacity;
217
205
}
218
206
219
207
/* 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){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
223
210
int ret;
224
211
server *new_server = malloc(sizeof(server));
225
212
if(new_server == NULL){
234
221
perror_plus("strdup");
235
222
return false;
236
223
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
224
/* Special case of first server */
243
if(*current_server == NULL){
225
if (mc.current_server == NULL){
244
226
new_server->next = new_server;
245
227
new_server->prev = new_server;
246
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
247
230
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
251
233
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
253
240
}
254
241
return true;
255
242
}
257
244
/*
258
245
* Initialize GPGME.
259
246
*/
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){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
265
249
gpgme_error_t rc;
266
250
gpgme_engine_info_t engine_info;
267
251
252
268
253
/*
269
254
* Helper function to insert pub and seckey to the engine keyring.
270
255
*/
271
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
272
257
int ret;
273
258
int fd;
274
259
gpgme_data_t pgp_data;
286
271
return false;
287
272
}
288
273
289
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
290
275
if(rc != GPG_ERR_NO_ERROR){
291
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
277
gpgme_strsource(rc), gpgme_strerror(rc));
336
321
}
337
322
338
323
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
340
325
if(rc != GPG_ERR_NO_ERROR){
341
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
340
* Decrypt OpenPGP data.
356
341
* Returns -1 on error
357
342
*/
358
__attribute__((nonnull, warn_unused_result))
359
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
344
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
345
char **plaintext){
363
346
gpgme_data_t dh_crypto, dh_plain;
364
347
gpgme_error_t rc;
365
348
ssize_t ret;
391
374
392
375
/* Decrypt data from the cryptotext data buffer to the plaintext
393
376
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
378
if(rc != GPG_ERR_NO_ERROR){
396
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
380
gpgme_strsource(rc), gpgme_strerror(rc));
398
381
plaintext_length = -1;
399
382
if(debug){
400
383
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
402
385
if(result == NULL){
403
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
387
} else {
481
464
return plaintext_length;
482
465
}
483
466
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
487
470
if(ret == NULL)
488
471
ret = "(unknown)";
489
472
return ret;
490
473
}
491
474
492
475
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
476
static void debuggnutls(__attribute__((unused)) int level,
495
477
const char* string){
496
478
fprintf_plus(stderr, "GnuTLS: %s", string);
497
479
}
498
480
499
__attribute__((nonnull, warn_unused_result))
500
481
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
482
const char *seckeyfilename){
503
483
int ret;
504
484
505
485
if(debug){
522
502
}
523
503
524
504
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
506
if(ret != GNUTLS_E_SUCCESS){
527
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
508
safer_gnutls_strerror(ret));
538
518
}
539
519
540
520
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
542
522
GNUTLS_OPENPGP_FMT_BASE64);
543
523
if(ret != GNUTLS_E_SUCCESS){
544
524
fprintf_plus(stderr,
550
530
}
551
531
552
532
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
554
534
if(ret != GNUTLS_E_SUCCESS){
555
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
536
" initialization: %s\n",
557
537
safer_gnutls_strerror(ret));
558
538
goto globalfail;
559
539
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
541
if(ret != GNUTLS_E_SUCCESS){
562
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
543
safer_gnutls_strerror(ret));
564
544
goto globalfail;
565
545
}
566
546
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
548
569
549
return 0;
570
550
571
551
globalfail:
572
552
573
gnutls_certificate_free_credentials(mc->cred);
553
gnutls_certificate_free_credentials(mc.cred);
574
554
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_dh_params_deinit(mc.dh_params);
576
556
return -1;
577
557
}
578
558
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
582
560
int ret;
583
561
/* GnuTLS session creation */
584
562
do {
596
574
{
597
575
const char *err;
598
576
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
578
if(quit_now){
601
579
gnutls_deinit(*session);
602
580
return -1;
613
591
614
592
do {
615
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
594
mc.cred);
617
595
if(quit_now){
618
596
gnutls_deinit(*session);
619
597
return -1;
629
607
/* ignore client certificate if any. */
630
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
609
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
611
634
612
return 0;
635
613
}
639
617
__attribute__((unused)) const char *txt){}
640
618
641
619
/* 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,
620
static int start_mandos_communication(const char *ip, uint16_t port,
644
621
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
622
int af){
646
623
int ret, tcp_sd = -1;
647
624
ssize_t sret;
648
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
649
629
char *buffer = NULL;
650
630
char *decrypted_buffer = NULL;
651
631
size_t buffer_length = 0;
675
655
return -1;
676
656
}
677
657
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);
658
ret = init_gnutls_session(&session);
711
659
if(ret != 0){
712
660
return -1;
713
661
}
714
662
715
663
if(debug){
716
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
718
666
}
719
667
720
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
680
733
681
memset(&to, 0, sizeof(to));
734
682
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);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
685
} 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);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
740
688
}
741
689
if(ret < 0 ){
742
690
int e = errno;
751
699
goto mandos_end;
752
700
}
753
701
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)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
757
709
if(if_index == AVAHI_IF_UNSPEC){
758
710
fprintf_plus(stderr, "An IPv6 link-local address is"
759
711
" incomplete without a network interface\n");
761
713
goto mandos_end;
762
714
}
763
715
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
765
717
}
766
718
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
768
722
}
769
723
770
724
if(quit_now){
778
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
733
perror_plus("if_indextoname");
780
734
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
783
737
}
784
738
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
787
741
}
788
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
790
745
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
795
748
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
800
751
}
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);
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
807
758
}
808
759
}
809
760
813
764
}
814
765
815
766
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
768
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
770
}
822
771
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
773
int e = errno;
825
774
perror_plus("connect");
826
775
errno = e;
987
936
if(buffer_length > 0){
988
937
ssize_t decrypted_buffer_size;
989
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
939
&decrypted_buffer);
991
940
if(decrypted_buffer_size >= 0){
992
941
993
942
written = 0;
1041
990
return retval;
1042
991
}
1043
992
1044
__attribute__((nonnull))
1045
993
static void resolve_callback(AvahiSServiceResolver *r,
1046
994
AvahiIfIndex interface,
1047
995
AvahiProtocol proto,
1055
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
1005
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1062
1008
1063
1009
/* Called whenever a service has been resolved successfully or
1064
1010
timed out */
1073
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
1021
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1078
1023
break;
1079
1024
1080
1025
case AVAHI_RESOLVER_FOUND:
1086
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
1032
host_name, ip, (intmax_t)interface, port);
1088
1033
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1093
1036
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1095
1038
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1099
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
1042
" list\n", name);
1101
1043
}
1114
1056
const char *domain,
1115
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1058
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1121
1061
1122
1062
/* Called whenever a new services becomes available on the LAN or
1123
1063
is removed from the LAN */
1131
1071
case AVAHI_BROWSER_FAILURE:
1132
1072
1133
1073
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);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1137
1076
return;
1138
1077
1139
1078
case AVAHI_BROWSER_NEW:
1142
1081
the callback function is called the Avahi server will free the
1143
1082
resolver for us. */
1144
1083
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)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1149
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
1088
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1153
1090
break;
1154
1091
1155
1092
case AVAHI_BROWSER_REMOVE:
1174
1111
signal_received = sig;
1175
1112
int old_errno = errno;
1176
1113
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1179
1116
}
1180
1117
errno = old_errno;
1181
1118
}
1182
1119
1183
__attribute__((nonnull, warn_unused_result))
1184
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1121
int ret;
1186
error_t ret_errno;
1187
1122
1188
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1124
if(s < 0){
1190
ret_errno = errno;
1191
1125
perror_plus("socket");
1192
errno = ret_errno;
1193
1126
return false;
1194
1127
}
1195
1128
strcpy(ifr->ifr_name, ifname);
1196
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1130
if(ret == -1){
1198
1131
if(debug){
1199
ret_errno = errno;
1200
1132
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1133
}
1203
1134
return false;
1204
1135
}
1205
1136
return true;
1206
1137
}
1207
1138
1208
__attribute__((nonnull, warn_unused_result))
1209
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1140
1211
1141
/* Reject the loopback device */
1253
1183
* corresponds to an acceptable network device.
1254
1184
* (This function is passed to scandir(3) as a filter function.)
1255
1185
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1186
int good_interface(const struct dirent *if_entry){
1258
1187
if(if_entry->d_name[0] == '.'){
1259
1188
return 0;
1275
1204
}
1276
1205
1277
1206
/*
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))
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1312
1249
int notdotentries(const struct dirent *direntry){
1313
1250
/* Skip "." and ".." */
1314
1251
if(direntry->d_name[0] == '.'
1321
1258
}
1322
1259
1323
1260
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1261
int runnable_hook(const struct dirent *direntry){
1326
1262
int ret;
1327
1263
size_t sret;
1382
1318
return 1;
1383
1319
}
1384
1320
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1388
1322
int ret;
1389
1323
struct timespec now;
1390
1324
struct timespec waited_time;
1391
1325
intmax_t block_time;
1392
1326
1393
1327
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1396
1330
fprintf_plus(stderr, "Wait until first server is found."
1397
1331
" No timeout!\n");
1398
1332
}
1399
1333
ret = avahi_simple_poll_iterate(s, -1);
1400
1334
} else {
1401
if(debug){
1335
if (debug){
1402
1336
fprintf_plus(stderr, "Check current_server if we should run"
1403
1337
" it, or wait\n");
1404
1338
}
1411
1345
/* Calculating in ms how long time between now and server
1412
1346
who we visted longest time ago. Now - last seen. */
1413
1347
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1415
1349
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1417
1351
/* total time is 10s/10,000ms.
1418
1352
Converting to s from ms by dividing by 1,000,
1419
1353
and ns to ms by dividing by 1,000,000. */
1421
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1422
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1357
1424
if(debug){
1358
if (debug){
1425
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
1360
block_time);
1427
1361
}
1428
1362
1429
1363
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);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1434
1368
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1436
1370
return 0;
1437
1371
}
1438
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1440
1374
if(ret == -1){
1441
1375
perror_plus("clock_gettime");
1442
1376
return -1;
1443
1377
}
1444
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1445
1379
block_time = 0; /* Call avahi to find new Mandos
1446
1380
servers, but don't block */
1447
1381
}
1449
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
1384
}
1451
1385
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1453
1387
return (ret != 1) ? ret : 0;
1454
1388
}
1455
1389
}
1456
1390
}
1457
1391
}
1458
1392
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,
1393
bool run_network_hooks(const char *mode, const char *interface,
1517
1394
const float delay){
1518
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1519
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
1399
alphasort);
1521
1400
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
}
1401
perror_plus("scandir");
1530
1402
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
1403
int devnull = open("/dev/null", O_RDONLY);
1534
1404
for(int i = 0; i < numhooks; i++){
1535
1405
direntry = direntries[i];
1547
1417
if(hook_pid == 0){
1548
1418
/* Child */
1549
1419
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1553
1430
}
1554
1431
/* Set group */
1555
1432
errno = 0;
1556
1433
ret = setgid(0);
1557
1434
if(ret == -1){
1558
1435
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
1436
}
1561
1437
/* Reset supplementary groups */
1562
1438
errno = 0;
1563
1439
ret = setgroups(0, NULL);
1564
1440
if(ret == -1){
1565
1441
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
}
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
1447
if(ret == -1){
1585
1448
perror_plus("setenv");
1601
1464
_exit(EX_OSERR);
1602
1465
}
1603
1466
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1467
ret = asprintf(&delaystring, "%f", delay);
1605
1468
if(ret == -1){
1606
1469
perror_plus("asprintf");
1607
1470
_exit(EX_OSERR);
1660
1523
}
1661
1524
close(devnull);
1662
1525
}
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;
1526
return true;
1863
1527
}
1864
1528
1865
1529
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
1530
AvahiSServiceBrowser *sb = NULL;
1871
error_t ret_errno;
1531
int error;
1872
1532
int ret;
1873
1533
intmax_t tmpmax;
1874
1534
char *tmp;
1875
1535
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;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
1881
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
1545
const char *seckey = PATHDIR "/" SECKEY;
1883
1546
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1885
1547
1886
1548
bool gnutls_initialized = false;
1887
1549
bool gpgme_initialized = false;
1978
1640
connect_to = arg;
1979
1641
break;
1980
1642
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
}
1643
interface = arg;
1986
1644
break;
1987
1645
case 's': /* --seckey */
1988
1646
seckey = arg;
2065
1723
/* Work around Debian bug #633582:
2066
1724
<http://bugs.debian.org/633582> */
2067
1725
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");
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2073
1731
} else {
2074
1732
struct stat st;
2075
1733
2116
1774
}
2117
1775
2118
1776
/* 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;
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2140
1781
}
2141
1782
}
2142
1783
}
2143
1784
2144
1785
/* 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);
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2157
1788
}
2158
1789
2159
1790
if(not debug){
2160
1791
avahi_set_log_function(empty_log);
2161
1792
}
2162
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
2163
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
1827
from the signal handler */
2165
1828
/* Initialize the pseudo-RNG for Avahi */
2166
1829
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2169
1832
fprintf_plus(stderr,
2170
1833
"Avahi: Failed to create simple poll object.\n");
2171
1834
exitcode = EX_UNAVAILABLE;
2235
1898
}
2236
1899
}
2237
1900
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;
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2285
1986
}
2286
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2287
2005
break;
2288
2006
}
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);
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2316
2036
}
2317
2037
2318
2038
if(quit_now){
2319
2039
goto end;
2320
2040
}
2321
2041
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2323
2043
if(ret == -1){
2324
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
2045
exitcode = EX_UNAVAILABLE;
2332
2052
goto end;
2333
2053
}
2334
2054
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){
2055
if(mkdtemp(tempdir) == NULL){
2345
2056
perror_plus("mkdtemp");
2346
2057
goto end;
2347
2058
}
2059
tempdir_created = true;
2348
2060
2349
2061
if(quit_now){
2350
2062
goto end;
2351
2063
}
2352
2064
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2354
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2355
2067
exitcode = EX_UNAVAILABLE;
2356
2068
goto end;
2366
2078
/* Connect directly, do not use Zeroconf */
2367
2079
/* (Mainly meant for debugging) */
2368
2080
char *address = strrchr(connect_to, ':');
2369
2370
2081
if(address == NULL){
2371
2082
fprintf_plus(stderr, "No colon in address\n");
2372
2083
exitcode = EX_USAGE;
2377
2088
goto end;
2378
2089
}
2379
2090
2380
in_port_t port;
2091
uint16_t port;
2381
2092
errno = 0;
2382
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2383
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2385
2096
fprintf_plus(stderr, "Bad port number\n");
2386
2097
exitcode = EX_USAGE;
2387
2098
goto end;
2388
2099
}
2389
2100
2390
2101
if(quit_now){
2391
2102
goto end;
2392
2103
}
2393
2104
2394
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2395
2106
*address = '\0';
2396
2107
/* Colon in address indicates IPv6 */
2397
2108
int af;
2413
2124
}
2414
2125
2415
2126
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2418
2128
if(quit_now or ret == 0){
2419
2129
break;
2420
2130
}
2422
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
2133
(int)retry_interval);
2424
2134
}
2425
sleep((unsigned int)retry_interval);
2135
sleep((int)retry_interval);
2426
2136
}
2427
2137
2428
if(not quit_now){
2138
if (not quit_now){
2429
2139
exitcode = EXIT_SUCCESS;
2430
2140
}
2431
2141
2446
2156
config.publish_domain = 0;
2447
2157
2448
2158
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2451
2162
2452
2163
/* Free the Avahi configuration data */
2453
2164
avahi_server_config_free(&config);
2456
2167
/* Check if creating the Avahi server object succeeded */
2457
2168
if(mc.server == NULL){
2458
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2460
2171
exitcode = EX_UNAVAILABLE;
2461
2172
goto end;
2462
2173
}
2468
2179
/* Create the Avahi service browser */
2469
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2473
2183
if(sb == NULL){
2474
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
2185
avahi_strerror(avahi_server_errno(mc.server)));
2487
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2488
2198
}
2489
2199
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2492
2202
if(debug){
2493
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
2204
(ret == 0) ? "successfully" : "with error");
2501
2211
}
2502
2212
2503
2213
/* Cleanup things */
2504
free(mc.interfaces);
2505
2506
2214
if(sb != NULL)
2507
2215
avahi_s_service_browser_free(sb);
2508
2216
2509
2217
if(mc.server != NULL)
2510
2218
avahi_server_free(mc.server);
2511
2219
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2514
2222
2515
2223
if(gnutls_initialized){
2516
2224
gnutls_certificate_free_credentials(mc.cred);
2533
2241
}
2534
2242
}
2535
2243
2536
/* Re-raise privileges */
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2537
2248
{
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
}
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2564
2253
}
2565
2254
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2569
2271
}
2570
2272
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2574
2279
2575
2280
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2281
if(tempdir_created){
2577
2282
struct dirent **direntries = NULL;
2578
2283
struct dirent *direntry = NULL;
2579
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
2285
alphasort);
2581
if(numentries > 0){
2286
if (numentries > 0){
2582
2287
for(int i = 0; i < numentries; i++){
2583
2288
direntry = direntries[i];
2584
2289
char *fullname = NULL;
2599
2304
2600
2305
/* need to clean even if 0 because man page doesn't specify */
2601
2306
free(direntries);
2602
if(numentries == -1){
2307
if (numentries == -1){
2603
2308
perror_plus("scandir");
2604
2309
}
2605
2310
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0