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- Committer: teddy at bsnet
- Date: 2011-12-24 19:43:26 UTC
- mto: This revision was merged to the branch mainline in revision 531.
- Revision ID: teddy@fukt.bsnet.se-20111224194326-egfeyd0140t03xmf
* plugins.d/mandos-client.c (add_server): Return bool; all callers
changed.
(resolve_callback): Check return value from add_server().
(main/parse_opt): Bug fix; Remove extra message on --version.
changed.
(resolve_callback): Check return value from add_server().
(main/parse_opt): Bug fix; Remove extra message on --version.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
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() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
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 };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
178
int fprintf_plus(FILE *stream, const char *format, ...){
190
179
va_list ap;
191
180
va_start (ap, format);
192
181
193
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
183
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
185
}
197
186
198
187
/*
200
189
* bytes. "buffer_capacity" is how much is currently allocated,
201
190
* "buffer_length" is how much is already used.
202
191
*/
203
__attribute__((nonnull, warn_unused_result))
204
192
size_t incbuffer(char **buffer, size_t buffer_length,
205
193
size_t buffer_capacity){
206
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
213
197
return 0;
214
198
}
215
*buffer = new_buf;
216
199
buffer_capacity += BUFFER_SIZE;
217
200
}
218
201
return buffer_capacity;
219
202
}
220
203
221
204
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
225
207
int ret;
226
208
server *new_server = malloc(sizeof(server));
227
209
if(new_server == NULL){
234
216
.af = af };
235
217
if(new_server->ip == NULL){
236
218
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
free(new_server->ip);
244
free(new_server);
245
219
return false;
246
220
}
247
221
/* Special case of first server */
248
if(*current_server == NULL){
222
if (mc.current_server == NULL){
249
223
new_server->next = new_server;
250
224
new_server->prev = new_server;
251
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
252
227
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
256
230
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
258
237
}
259
238
return true;
260
239
}
262
241
/*
263
242
* Initialize GPGME.
264
243
*/
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
270
246
gpgme_error_t rc;
271
247
gpgme_engine_info_t engine_info;
272
248
249
273
250
/*
274
251
* Helper function to insert pub and seckey to the engine keyring.
275
252
*/
276
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
277
254
int ret;
278
255
int fd;
279
256
gpgme_data_t pgp_data;
291
268
return false;
292
269
}
293
270
294
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
295
272
if(rc != GPG_ERR_NO_ERROR){
296
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
274
gpgme_strsource(rc), gpgme_strerror(rc));
341
318
}
342
319
343
320
/* Create new GPGME "context" */
344
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
345
322
if(rc != GPG_ERR_NO_ERROR){
346
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
337
* Decrypt OpenPGP data.
361
338
* Returns -1 on error
362
339
*/
363
__attribute__((nonnull, warn_unused_result))
364
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
365
341
size_t crypto_size,
366
char **plaintext,
367
mandos_context *mc){
342
char **plaintext){
368
343
gpgme_data_t dh_crypto, dh_plain;
369
344
gpgme_error_t rc;
370
345
ssize_t ret;
396
371
397
372
/* Decrypt data from the cryptotext data buffer to the plaintext
398
373
data buffer */
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
400
375
if(rc != GPG_ERR_NO_ERROR){
401
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
377
gpgme_strsource(rc), gpgme_strerror(rc));
403
378
plaintext_length = -1;
404
379
if(debug){
405
380
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
407
382
if(result == NULL){
408
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
409
384
} else {
486
461
return plaintext_length;
487
462
}
488
463
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
492
467
if(ret == NULL)
493
468
ret = "(unknown)";
494
469
return ret;
495
470
}
496
471
497
472
/* GnuTLS log function callback */
498
__attribute__((nonnull))
499
473
static void debuggnutls(__attribute__((unused)) int level,
500
474
const char* string){
501
475
fprintf_plus(stderr, "GnuTLS: %s", string);
502
476
}
503
477
504
__attribute__((nonnull, warn_unused_result))
505
478
static int init_gnutls_global(const char *pubkeyfilename,
506
const char *seckeyfilename,
507
mandos_context *mc){
479
const char *seckeyfilename){
508
480
int ret;
509
481
510
482
if(debug){
527
499
}
528
500
529
501
/* OpenPGP credentials */
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
531
503
if(ret != GNUTLS_E_SUCCESS){
532
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
505
safer_gnutls_strerror(ret));
543
515
}
544
516
545
517
ret = gnutls_certificate_set_openpgp_key_file
546
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
547
519
GNUTLS_OPENPGP_FMT_BASE64);
548
520
if(ret != GNUTLS_E_SUCCESS){
549
521
fprintf_plus(stderr,
555
527
}
556
528
557
529
/* GnuTLS server initialization */
558
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
559
531
if(ret != GNUTLS_E_SUCCESS){
560
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
533
" initialization: %s\n",
562
534
safer_gnutls_strerror(ret));
563
535
goto globalfail;
564
536
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
566
538
if(ret != GNUTLS_E_SUCCESS){
567
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
540
safer_gnutls_strerror(ret));
569
541
goto globalfail;
570
542
}
571
543
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
573
545
574
546
return 0;
575
547
576
548
globalfail:
577
549
578
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
579
551
gnutls_global_deinit();
580
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
581
553
return -1;
582
554
}
583
555
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
587
557
int ret;
588
558
/* GnuTLS session creation */
589
559
do {
601
571
{
602
572
const char *err;
603
573
do {
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
605
575
if(quit_now){
606
576
gnutls_deinit(*session);
607
577
return -1;
618
588
619
589
do {
620
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
621
mc->cred);
591
mc.cred);
622
592
if(quit_now){
623
593
gnutls_deinit(*session);
624
594
return -1;
634
604
/* ignore client certificate if any. */
635
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
606
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
638
608
639
609
return 0;
640
610
}
644
614
__attribute__((unused)) const char *txt){}
645
615
646
616
/* Called when a Mandos server is found */
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
649
618
AvahiIfIndex if_index,
650
int af, mandos_context *mc){
619
int af){
651
620
int ret, tcp_sd = -1;
652
621
ssize_t sret;
653
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
654
626
char *buffer = NULL;
655
627
char *decrypted_buffer = NULL;
656
628
size_t buffer_length = 0;
680
652
return -1;
681
653
}
682
654
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
716
656
if(ret != 0){
717
657
return -1;
718
658
}
719
659
720
660
if(debug){
721
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
723
663
}
724
664
725
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
737
677
738
678
memset(&to, 0, sizeof(to));
739
679
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
742
682
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
745
685
}
746
686
if(ret < 0 ){
747
687
int e = errno;
756
696
goto mandos_end;
757
697
}
758
698
if(af == AF_INET6){
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
762
706
if(if_index == AVAHI_IF_UNSPEC){
763
707
fprintf_plus(stderr, "An IPv6 link-local address is"
764
708
" incomplete without a network interface\n");
766
710
goto mandos_end;
767
711
}
768
712
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
770
714
}
771
715
} else {
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
773
719
}
774
720
775
721
if(quit_now){
783
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
730
perror_plus("if_indextoname");
785
731
} else {
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
788
734
}
789
735
} else {
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
792
738
}
793
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
795
742
if(af == AF_INET6){
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
800
745
} else {
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
805
748
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
812
755
}
813
756
}
814
757
818
761
}
819
762
820
763
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
823
765
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
826
767
}
827
768
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
770
int e = errno;
830
771
perror_plus("connect");
831
772
errno = e;
877
818
goto mandos_end;
878
819
}
879
820
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
885
823
886
824
if(quit_now){
887
825
errno = EINTR;
992
930
if(buffer_length > 0){
993
931
ssize_t decrypted_buffer_size;
994
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
933
&decrypted_buffer);
996
934
if(decrypted_buffer_size >= 0){
997
935
998
936
written = 0;
1046
984
return retval;
1047
985
}
1048
986
1049
__attribute__((nonnull))
1050
987
static void resolve_callback(AvahiSServiceResolver *r,
1051
988
AvahiIfIndex interface,
1052
989
AvahiProtocol proto,
1060
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1061
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
999
flags,
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1067
1002
1068
1003
/* Called whenever a service has been resolved successfully or
1069
1004
timed out */
1078
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
1015
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1083
1017
break;
1084
1018
1085
1019
case AVAHI_RESOLVER_FOUND:
1091
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
1026
host_name, ip, (intmax_t)interface, port);
1093
1027
}
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1098
1030
if(ret == 0){
1099
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1100
1032
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1104
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
1036
" list\n", name);
1106
1037
}
1119
1050
const char *domain,
1120
1051
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1121
1052
flags,
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
1053
AVAHI_GCC_UNUSED void* userdata){
1054
assert(b);
1126
1055
1127
1056
/* Called whenever a new services becomes available on the LAN or
1128
1057
is removed from the LAN */
1136
1065
case AVAHI_BROWSER_FAILURE:
1137
1066
1138
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
1142
1070
return;
1143
1071
1144
1072
case AVAHI_BROWSER_NEW:
1147
1075
the callback function is called the Avahi server will free the
1148
1076
resolver for us. */
1149
1077
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
name, type, domain, protocol, 0,
1080
resolve_callback, NULL) == NULL)
1154
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
1082
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
1083
avahi_strerror(avahi_server_errno(mc.server)));
1158
1084
break;
1159
1085
1160
1086
case AVAHI_BROWSER_REMOVE:
1179
1105
signal_received = sig;
1180
1106
int old_errno = errno;
1181
1107
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1108
if(mc.simple_poll != NULL){
1109
avahi_simple_poll_quit(mc.simple_poll);
1184
1110
}
1185
1111
errno = old_errno;
1186
1112
}
1187
1113
1188
__attribute__((nonnull, warn_unused_result))
1189
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
1115
int ret;
1191
error_t ret_errno;
1192
1116
1193
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
1118
if(s < 0){
1195
ret_errno = errno;
1196
1119
perror_plus("socket");
1197
errno = ret_errno;
1198
1120
return false;
1199
1121
}
1200
1122
strcpy(ifr->ifr_name, ifname);
1201
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
1124
if(ret == -1){
1203
1125
if(debug){
1204
ret_errno = errno;
1205
1126
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
1127
}
1208
1128
return false;
1209
1129
}
1210
1130
return true;
1211
1131
}
1212
1132
1213
__attribute__((nonnull, warn_unused_result))
1214
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1134
1216
1135
/* Reject the loopback device */
1258
1177
* corresponds to an acceptable network device.
1259
1178
* (This function is passed to scandir(3) as a filter function.)
1260
1179
*/
1261
__attribute__((nonnull, warn_unused_result))
1262
1180
int good_interface(const struct dirent *if_entry){
1263
1181
if(if_entry->d_name[0] == '.'){
1264
1182
return 0;
1280
1198
}
1281
1199
1282
1200
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1317
1243
int notdotentries(const struct dirent *direntry){
1318
1244
/* Skip "." and ".." */
1319
1245
if(direntry->d_name[0] == '.'
1326
1252
}
1327
1253
1328
1254
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
1255
int runnable_hook(const struct dirent *direntry){
1331
1256
int ret;
1332
1257
size_t sret;
1340
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
1266
"abcdefghijklmnopqrstuvwxyz"
1342
1267
"0123456789"
1343
"_.-");
1268
"_-");
1344
1269
if((direntry->d_name)[sret] != '\0'){
1345
1270
/* Contains non-allowed characters */
1346
1271
if(debug){
1350
1275
return 0;
1351
1276
}
1352
1277
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1354
1286
if(ret == -1){
1355
1287
if(debug){
1356
1288
perror_plus("Could not stat hook");
1380
1312
return 1;
1381
1313
}
1382
1314
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1316
int ret;
1387
1317
struct timespec now;
1388
1318
struct timespec waited_time;
1389
1319
intmax_t block_time;
1390
1320
1391
1321
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1322
if(mc.current_server == NULL){
1323
if (debug){
1394
1324
fprintf_plus(stderr, "Wait until first server is found."
1395
1325
" No timeout!\n");
1396
1326
}
1397
1327
ret = avahi_simple_poll_iterate(s, -1);
1398
1328
} else {
1399
if(debug){
1329
if (debug){
1400
1330
fprintf_plus(stderr, "Check current_server if we should run"
1401
1331
" it, or wait\n");
1402
1332
}
1409
1339
/* Calculating in ms how long time between now and server
1410
1340
who we visted longest time ago. Now - last seen. */
1411
1341
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1342
- mc.current_server->last_seen.tv_sec);
1413
1343
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1344
- mc.current_server->last_seen.tv_nsec);
1415
1345
/* total time is 10s/10,000ms.
1416
1346
Converting to s from ms by dividing by 1,000,
1417
1347
and ns to ms by dividing by 1,000,000. */
1419
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1351
1422
if(debug){
1352
if (debug){
1423
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
1354
block_time);
1425
1355
}
1426
1356
1427
1357
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1432
1362
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1363
avahi_simple_poll_quit(mc.simple_poll);
1434
1364
return 0;
1435
1365
}
1436
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1367
&mc.current_server->last_seen);
1438
1368
if(ret == -1){
1439
1369
perror_plus("clock_gettime");
1440
1370
return -1;
1441
1371
}
1442
mc->current_server = mc->current_server->next;
1372
mc.current_server = mc.current_server->next;
1443
1373
block_time = 0; /* Call avahi to find new Mandos
1444
1374
servers, but don't block */
1445
1375
}
1447
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1378
}
1449
1379
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1380
if (ret > 0 or errno != EINTR){
1451
1381
return (ret != 1) ? ret : 0;
1452
1382
}
1453
1383
}
1454
1384
}
1455
1385
}
1456
1386
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1387
bool run_network_hooks(const char *mode, const char *interface,
1511
1388
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1539
1394
if(numhooks == -1){
1540
1395
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1613
1403
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1618
1472
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1882
1512
}
1883
1513
1884
1514
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
1515
AvahiSServiceBrowser *sb = NULL;
1890
error_t ret_errno;
1516
int error;
1891
1517
int ret;
1892
1518
intmax_t tmpmax;
1893
1519
char *tmp;
1894
1520
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1521
const char *interface = "";
1522
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
1525
uid_t uid;
1526
gid_t gid;
1527
char tempdir[] = "/tmp/mandosXXXXXX";
1528
bool tempdir_created = false;
1900
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
1530
const char *seckey = PATHDIR "/" SECKEY;
1902
1531
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1904
1532
1905
1533
bool gnutls_initialized = false;
1906
1534
bool gpgme_initialized = false;
1968
1596
.group = 2 },
1969
1597
{ .name = "retry", .key = 132,
1970
1598
.arg = "SECONDS",
1971
.doc = "Retry interval used when denied by the Mandos server",
1599
.doc = "Retry interval used when denied by the mandos server",
1972
1600
.group = 2 },
1973
1601
{ .name = "network-hook-dir", .key = 133,
1974
1602
.arg = "DIR",
1997
1625
connect_to = arg;
1998
1626
break;
1999
1627
case 'i': /* --interface */
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1628
interface = arg;
2005
1629
break;
2006
1630
case 's': /* --seckey */
2007
1631
seckey = arg;
2084
1708
/* Work around Debian bug #633582:
2085
1709
<http://bugs.debian.org/633582> */
2086
1710
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
2092
1716
} else {
2093
1717
struct stat st;
2094
1718
2135
1759
}
2136
1760
2137
1761
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
2159
1766
}
2160
1767
}
2161
1768
}
2162
1769
2163
1770
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
2176
1773
}
2177
1774
2178
1775
if(not debug){
2179
1776
avahi_set_log_function(empty_log);
2180
1777
}
2181
1778
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
if(ret >= 1){
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1793
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1806
exitcode = EXIT_FAILURE;
1807
goto end;
1808
}
1809
}
1810
2182
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
1812
from the signal handler */
2184
1813
/* Initialize the pseudo-RNG for Avahi */
2185
1814
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
2188
1817
fprintf_plus(stderr,
2189
1818
"Avahi: Failed to create simple poll object.\n");
2190
1819
exitcode = EX_UNAVAILABLE;
2254
1883
}
2255
1884
}
2256
1885
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
2279
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
1886
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
if(if_index == 0){
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1892
goto end;
1893
}
1894
1895
if(quit_now){
1896
goto end;
1897
}
1898
1899
/* Re-raise priviliges */
1900
errno = 0;
1901
ret = seteuid(0);
1902
if(ret == -1){
1903
perror_plus("seteuid");
1904
}
1905
1906
#ifdef __linux__
1907
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
1909
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1911
if(ret == -1){
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
1914
}
1915
#endif /* __linux__ */
1916
1917
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
if(sd < 0){
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1924
if(ret == -1){
1925
perror_plus("klogctl");
1926
}
1927
}
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1930
errno = 0;
1931
ret = seteuid(uid);
1932
if(ret == -1){
1933
perror_plus("seteuid");
1934
}
1935
goto end;
1936
}
1937
strcpy(network.ifr_name, interface);
1938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
1941
#ifdef __linux__
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1944
if(ret == -1){
1945
perror_plus("klogctl");
1946
}
1947
}
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1951
errno = 0;
1952
ret = seteuid(uid);
1953
if(ret == -1){
1954
perror_plus("seteuid");
1955
}
1956
goto end;
1957
}
1958
if((network.ifr_flags & IFF_UP) == 0){
1959
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
if(ret == -1){
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
1966
#ifdef __linux__
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1969
if(ret == -1){
1970
perror_plus("klogctl");
2306
1971
}
2307
1972
}
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1975
errno = 0;
1976
ret = seteuid(uid);
1977
if(ret == -1){
1978
perror_plus("seteuid");
1979
}
1980
goto end;
1981
}
1982
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1985
for(int i=0; i < delay * 4; i++){
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1989
} else if(network.ifr_flags & IFF_RUNNING){
2308
1990
break;
2309
1991
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1992
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
ret = nanosleep(&sleeptime, NULL);
1994
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1996
}
1997
}
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
if(ret == -1){
2002
perror_plus("close");
2003
}
2004
}
2005
#ifdef __linux__
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2009
if(ret == -1){
2010
perror_plus("klogctl");
2011
}
2012
}
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2015
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
2020
}
2337
2021
}
2338
2022
2339
2023
if(quit_now){
2340
2024
goto end;
2341
2025
}
2342
2026
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2027
ret = init_gnutls_global(pubkey, seckey);
2344
2028
if(ret == -1){
2345
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
2030
exitcode = EX_UNAVAILABLE;
2353
2037
goto end;
2354
2038
}
2355
2039
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
2040
if(mkdtemp(tempdir) == NULL){
2366
2041
perror_plus("mkdtemp");
2367
2042
goto end;
2368
2043
}
2044
tempdir_created = true;
2369
2045
2370
2046
if(quit_now){
2371
2047
goto end;
2372
2048
}
2373
2049
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
2375
2051
fprintf_plus(stderr, "init_gpgme failed\n");
2376
2052
exitcode = EX_UNAVAILABLE;
2377
2053
goto end;
2387
2063
/* Connect directly, do not use Zeroconf */
2388
2064
/* (Mainly meant for debugging) */
2389
2065
char *address = strrchr(connect_to, ':');
2390
2391
2066
if(address == NULL){
2392
2067
fprintf_plus(stderr, "No colon in address\n");
2393
2068
exitcode = EX_USAGE;
2398
2073
goto end;
2399
2074
}
2400
2075
2401
in_port_t port;
2076
uint16_t port;
2402
2077
errno = 0;
2403
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2404
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2080
or tmpmax != (uint16_t)tmpmax){
2406
2081
fprintf_plus(stderr, "Bad port number\n");
2407
2082
exitcode = EX_USAGE;
2408
2083
goto end;
2409
2084
}
2410
2085
2411
2086
if(quit_now){
2412
2087
goto end;
2413
2088
}
2414
2089
2415
port = (in_port_t)tmpmax;
2090
port = (uint16_t)tmpmax;
2416
2091
*address = '\0';
2417
2092
/* Colon in address indicates IPv6 */
2418
2093
int af;
2434
2109
}
2435
2110
2436
2111
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
2112
ret = start_mandos_communication(address, port, if_index, af);
2439
2113
if(quit_now or ret == 0){
2440
2114
break;
2441
2115
}
2443
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
2118
(int)retry_interval);
2445
2119
}
2446
sleep((unsigned int)retry_interval);
2120
sleep((int)retry_interval);
2447
2121
}
2448
2122
2449
if(not quit_now){
2123
if (not quit_now){
2450
2124
exitcode = EXIT_SUCCESS;
2451
2125
}
2452
2126
2467
2141
config.publish_domain = 0;
2468
2142
2469
2143
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
2144
mc.server = avahi_server_new(avahi_simple_poll_get
2145
(mc.simple_poll), &config, NULL,
2146
NULL, &error);
2472
2147
2473
2148
/* Free the Avahi configuration data */
2474
2149
avahi_server_config_free(&config);
2477
2152
/* Check if creating the Avahi server object succeeded */
2478
2153
if(mc.server == NULL){
2479
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2155
avahi_strerror(error));
2481
2156
exitcode = EX_UNAVAILABLE;
2482
2157
goto end;
2483
2158
}
2489
2164
/* Create the Avahi service browser */
2490
2165
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
2167
NULL, 0, browse_callback, NULL);
2494
2168
if(sb == NULL){
2495
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
2170
avahi_strerror(avahi_server_errno(mc.server)));
2507
2181
if(debug){
2508
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
2509
2183
}
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2513
2187
if(debug){
2514
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
2189
(ret == 0) ? "successfully" : "with error");
2522
2196
}
2523
2197
2524
2198
/* Cleanup things */
2525
free(mc.interfaces);
2526
2527
2199
if(sb != NULL)
2528
2200
avahi_s_service_browser_free(sb);
2529
2201
2530
2202
if(mc.server != NULL)
2531
2203
avahi_server_free(mc.server);
2532
2204
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2535
2207
2536
2208
if(gnutls_initialized){
2537
2209
gnutls_certificate_free_credentials(mc.cred);
2554
2226
}
2555
2227
}
2556
2228
2557
/* Re-raise privileges */
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2558
2233
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2586
2238
}
2587
2239
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
}
2251
}
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
if(ret == -1){
2254
perror_plus("close");
2255
}
2592
2256
}
2593
2257
}
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2597
2264
2598
2265
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2266
if(tempdir_created){
2600
2267
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
2274
char *fullname = NULL;
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
direntry->d_name);
2277
if(ret < 0){
2278
perror_plus("asprintf");
2279
continue;
2280
}
2281
ret = remove(fullname);
2282
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
2285
}
2286
free(fullname);
2637
2287
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
2294
}
2295
ret = rmdir(tempdir);
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
2639
2298
}
2640
2299
}
2641
2300
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0