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- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- 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
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() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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
138
uid_t uid = 65534;
147
139
gid_t gid = 65534;
148
140
149
141
/* Doubly linked list that need to be circularly linked when used */
150
142
typedef struct server{
151
143
const char *ip;
152
in_port_t port;
144
uint16_t port;
153
145
AvahiIfIndex if_index;
154
146
int af;
155
147
struct timespec last_seen;
159
151
160
152
/* Used for passing in values through the Avahi callback functions */
161
153
typedef struct {
154
AvahiSimplePoll *simple_poll;
162
155
AvahiServer *server;
163
156
gnutls_certificate_credentials_t cred;
164
157
unsigned int dh_bits;
166
159
const char *priority;
167
160
gpgme_ctx_t ctx;
168
161
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
162
} mandos_context;
172
163
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
175
169
176
170
sig_atomic_t quit_now = 0;
177
171
int signal_received = 0;
185
179
perror(print_text);
186
180
}
187
181
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
__attribute__((format (gnu_printf, 2, 3)))
189
183
int fprintf_plus(FILE *stream, const char *format, ...){
190
184
va_list ap;
191
185
va_start (ap, format);
192
186
193
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
188
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
190
}
197
191
198
192
/*
200
194
* bytes. "buffer_capacity" is how much is currently allocated,
201
195
* "buffer_length" is how much is already used.
202
196
*/
203
__attribute__((nonnull, warn_unused_result))
204
197
size_t incbuffer(char **buffer, size_t buffer_length,
205
198
size_t buffer_capacity){
206
199
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;
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
213
202
return 0;
214
203
}
215
*buffer = new_buf;
216
204
buffer_capacity += BUFFER_SIZE;
217
205
}
218
206
return buffer_capacity;
219
207
}
220
208
221
209
/* 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){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
225
212
int ret;
226
213
server *new_server = malloc(sizeof(server));
227
214
if(new_server == NULL){
234
221
.af = af };
235
222
if(new_server->ip == NULL){
236
223
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
224
return false;
246
225
}
247
226
/* Special case of first server */
248
if(*current_server == NULL){
227
if (mc.current_server == NULL){
249
228
new_server->next = new_server;
250
229
new_server->prev = new_server;
251
*current_server = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
252
232
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
256
235
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
258
242
}
259
243
return true;
260
244
}
262
246
/*
263
247
* Initialize GPGME.
264
248
*/
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){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
270
251
gpgme_error_t rc;
271
252
gpgme_engine_info_t engine_info;
272
253
254
273
255
/*
274
256
* Helper function to insert pub and seckey to the engine keyring.
275
257
*/
276
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
277
259
int ret;
278
260
int fd;
279
261
gpgme_data_t pgp_data;
291
273
return false;
292
274
}
293
275
294
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
295
277
if(rc != GPG_ERR_NO_ERROR){
296
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
279
gpgme_strsource(rc), gpgme_strerror(rc));
341
323
}
342
324
343
325
/* Create new GPGME "context" */
344
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
345
327
if(rc != GPG_ERR_NO_ERROR){
346
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
342
* Decrypt OpenPGP data.
361
343
* Returns -1 on error
362
344
*/
363
__attribute__((nonnull, warn_unused_result))
364
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
365
346
size_t crypto_size,
366
char **plaintext,
367
mandos_context *mc){
347
char **plaintext){
368
348
gpgme_data_t dh_crypto, dh_plain;
369
349
gpgme_error_t rc;
370
350
ssize_t ret;
396
376
397
377
/* Decrypt data from the cryptotext data buffer to the plaintext
398
378
data buffer */
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
400
380
if(rc != GPG_ERR_NO_ERROR){
401
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
382
gpgme_strsource(rc), gpgme_strerror(rc));
403
383
plaintext_length = -1;
404
384
if(debug){
405
385
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
407
387
if(result == NULL){
408
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
409
389
} else {
486
466
return plaintext_length;
487
467
}
488
468
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
492
472
if(ret == NULL)
493
473
ret = "(unknown)";
494
474
return ret;
495
475
}
496
476
497
477
/* GnuTLS log function callback */
498
__attribute__((nonnull))
499
478
static void debuggnutls(__attribute__((unused)) int level,
500
479
const char* string){
501
480
fprintf_plus(stderr, "GnuTLS: %s", string);
502
481
}
503
482
504
__attribute__((nonnull, warn_unused_result))
505
483
static int init_gnutls_global(const char *pubkeyfilename,
506
const char *seckeyfilename,
507
mandos_context *mc){
484
const char *seckeyfilename){
508
485
int ret;
509
486
510
487
if(debug){
527
504
}
528
505
529
506
/* OpenPGP credentials */
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
531
508
if(ret != GNUTLS_E_SUCCESS){
532
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
510
safer_gnutls_strerror(ret));
543
520
}
544
521
545
522
ret = gnutls_certificate_set_openpgp_key_file
546
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
547
524
GNUTLS_OPENPGP_FMT_BASE64);
548
525
if(ret != GNUTLS_E_SUCCESS){
549
526
fprintf_plus(stderr,
555
532
}
556
533
557
534
/* GnuTLS server initialization */
558
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
559
536
if(ret != GNUTLS_E_SUCCESS){
560
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
538
" initialization: %s\n",
562
539
safer_gnutls_strerror(ret));
563
540
goto globalfail;
564
541
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
566
543
if(ret != GNUTLS_E_SUCCESS){
567
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
545
safer_gnutls_strerror(ret));
569
546
goto globalfail;
570
547
}
571
548
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
573
550
574
551
return 0;
575
552
576
553
globalfail:
577
554
578
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_certificate_free_credentials(mc.cred);
579
556
gnutls_global_deinit();
580
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_dh_params_deinit(mc.dh_params);
581
558
return -1;
582
559
}
583
560
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
587
562
int ret;
588
563
/* GnuTLS session creation */
589
564
do {
601
576
{
602
577
const char *err;
603
578
do {
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
605
580
if(quit_now){
606
581
gnutls_deinit(*session);
607
582
return -1;
618
593
619
594
do {
620
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
621
mc->cred);
596
mc.cred);
622
597
if(quit_now){
623
598
gnutls_deinit(*session);
624
599
return -1;
634
609
/* ignore client certificate if any. */
635
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
611
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
638
613
639
614
return 0;
640
615
}
644
619
__attribute__((unused)) const char *txt){}
645
620
646
621
/* 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,
622
static int start_mandos_communication(const char *ip, uint16_t port,
649
623
AvahiIfIndex if_index,
650
int af, mandos_context *mc){
624
int af){
651
625
int ret, tcp_sd = -1;
652
626
ssize_t sret;
653
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
654
631
char *buffer = NULL;
655
632
char *decrypted_buffer = NULL;
656
633
size_t buffer_length = 0;
680
657
return -1;
681
658
}
682
659
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);
660
ret = init_gnutls_session(&session);
716
661
if(ret != 0){
717
662
return -1;
718
663
}
719
664
720
665
if(debug){
721
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
667
PRIu16 "\n", ip, port);
723
668
}
724
669
725
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
737
682
738
683
memset(&to, 0, sizeof(to));
739
684
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);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
742
687
} 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);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
745
690
}
746
691
if(ret < 0 ){
747
692
int e = errno;
756
701
goto mandos_end;
757
702
}
758
703
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)){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
762
711
if(if_index == AVAHI_IF_UNSPEC){
763
712
fprintf_plus(stderr, "An IPv6 link-local address is"
764
713
" incomplete without a network interface\n");
766
715
goto mandos_end;
767
716
}
768
717
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
to.in6.sin6_scope_id = (uint32_t)if_index;
770
719
}
771
720
} else {
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
773
724
}
774
725
775
726
if(quit_now){
783
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
735
perror_plus("if_indextoname");
785
736
} else {
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
788
739
}
789
740
} else {
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
792
743
}
793
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
795
747
if(af == AF_INET6){
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
800
750
} else {
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
805
753
}
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);
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
812
760
}
813
761
}
814
762
818
766
}
819
767
820
768
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
823
770
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
826
772
}
827
773
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
775
int e = errno;
830
776
perror_plus("connect");
831
777
errno = e;
992
938
if(buffer_length > 0){
993
939
ssize_t decrypted_buffer_size;
994
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
941
&decrypted_buffer);
996
942
if(decrypted_buffer_size >= 0){
997
943
998
944
written = 0;
1046
992
return retval;
1047
993
}
1048
994
1049
__attribute__((nonnull))
1050
995
static void resolve_callback(AvahiSServiceResolver *r,
1051
996
AvahiIfIndex interface,
1052
997
AvahiProtocol proto,
1060
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
1061
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
1007
flags,
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1067
1010
1068
1011
/* Called whenever a service has been resolved successfully or
1069
1012
timed out */
1078
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
1023
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1024
avahi_strerror(avahi_server_errno(mc.server)));
1083
1025
break;
1084
1026
1085
1027
case AVAHI_RESOLVER_FOUND:
1091
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
1034
host_name, ip, (intmax_t)interface, port);
1093
1035
}
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1098
1038
if(ret == 0){
1099
avahi_simple_poll_quit(simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1100
1040
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1104
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
1044
" list\n", name);
1106
1045
}
1119
1058
const char *domain,
1120
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1121
1060
flags,
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1126
1063
1127
1064
/* Called whenever a new services becomes available on the LAN or
1128
1065
is removed from the LAN */
1136
1073
case AVAHI_BROWSER_FAILURE:
1137
1074
1138
1075
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);
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1142
1078
return;
1143
1079
1144
1080
case AVAHI_BROWSER_NEW:
1147
1083
the callback function is called the Avahi server will free the
1148
1084
resolver for us. */
1149
1085
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)
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1154
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
1090
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
1091
avahi_strerror(avahi_server_errno(mc.server)));
1158
1092
break;
1159
1093
1160
1094
case AVAHI_BROWSER_REMOVE:
1179
1113
signal_received = sig;
1180
1114
int old_errno = errno;
1181
1115
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1184
1118
}
1185
1119
errno = old_errno;
1186
1120
}
1187
1121
1188
__attribute__((nonnull, warn_unused_result))
1189
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
1123
int ret;
1191
error_t ret_errno;
1192
1124
1193
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
1126
if(s < 0){
1195
ret_errno = errno;
1196
1127
perror_plus("socket");
1197
errno = ret_errno;
1198
1128
return false;
1199
1129
}
1200
1130
strcpy(ifr->ifr_name, ifname);
1201
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
1132
if(ret == -1){
1203
1133
if(debug){
1204
ret_errno = errno;
1205
1134
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
1135
}
1208
1136
return false;
1209
1137
}
1210
1138
return true;
1211
1139
}
1212
1140
1213
__attribute__((nonnull, warn_unused_result))
1214
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1142
1216
1143
/* Reject the loopback device */
1258
1185
* corresponds to an acceptable network device.
1259
1186
* (This function is passed to scandir(3) as a filter function.)
1260
1187
*/
1261
__attribute__((nonnull, warn_unused_result))
1262
1188
int good_interface(const struct dirent *if_entry){
1263
1189
if(if_entry->d_name[0] == '.'){
1264
1190
return 0;
1280
1206
}
1281
1207
1282
1208
/*
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))
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1317
1251
int notdotentries(const struct dirent *direntry){
1318
1252
/* Skip "." and ".." */
1319
1253
if(direntry->d_name[0] == '.'
1326
1260
}
1327
1261
1328
1262
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
1263
int runnable_hook(const struct dirent *direntry){
1331
1264
int ret;
1332
1265
size_t sret;
1340
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
1274
"abcdefghijklmnopqrstuvwxyz"
1342
1275
"0123456789"
1343
"_.-");
1276
"_-");
1344
1277
if((direntry->d_name)[sret] != '\0'){
1345
1278
/* Contains non-allowed characters */
1346
1279
if(debug){
1350
1283
return 0;
1351
1284
}
1352
1285
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1354
1294
if(ret == -1){
1355
1295
if(debug){
1356
1296
perror_plus("Could not stat hook");
1380
1320
return 1;
1381
1321
}
1382
1322
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1324
int ret;
1387
1325
struct timespec now;
1388
1326
struct timespec waited_time;
1389
1327
intmax_t block_time;
1390
1328
1391
1329
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1330
if(mc.current_server == NULL){
1331
if (debug){
1394
1332
fprintf_plus(stderr, "Wait until first server is found."
1395
1333
" No timeout!\n");
1396
1334
}
1397
1335
ret = avahi_simple_poll_iterate(s, -1);
1398
1336
} else {
1399
if(debug){
1337
if (debug){
1400
1338
fprintf_plus(stderr, "Check current_server if we should run"
1401
1339
" it, or wait\n");
1402
1340
}
1409
1347
/* Calculating in ms how long time between now and server
1410
1348
who we visted longest time ago. Now - last seen. */
1411
1349
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1350
- mc.current_server->last_seen.tv_sec);
1413
1351
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1352
- mc.current_server->last_seen.tv_nsec);
1415
1353
/* total time is 10s/10,000ms.
1416
1354
Converting to s from ms by dividing by 1,000,
1417
1355
and ns to ms by dividing by 1,000,000. */
1419
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1359
1422
if(debug){
1360
if (debug){
1423
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
1362
block_time);
1425
1363
}
1426
1364
1427
1365
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);
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1432
1370
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1371
avahi_simple_poll_quit(mc.simple_poll);
1434
1372
return 0;
1435
1373
}
1436
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1375
&mc.current_server->last_seen);
1438
1376
if(ret == -1){
1439
1377
perror_plus("clock_gettime");
1440
1378
return -1;
1441
1379
}
1442
mc->current_server = mc->current_server->next;
1380
mc.current_server = mc.current_server->next;
1443
1381
block_time = 0; /* Call avahi to find new Mandos
1444
1382
servers, but don't block */
1445
1383
}
1447
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1386
}
1449
1387
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1388
if (ret > 0 or errno != EINTR){
1451
1389
return (ret != 1) ? ret : 0;
1452
1390
}
1453
1391
}
1455
1393
}
1456
1394
1457
1395
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
1396
error_t raise_privileges(void){
1460
1397
error_t old_errno = errno;
1461
1398
error_t ret_errno = 0;
1462
1399
if(seteuid(0) == -1){
1463
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1464
1402
}
1465
1403
errno = old_errno;
1466
1404
return ret_errno;
1467
1405
}
1468
1406
1469
1407
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
1408
error_t raise_privileges_permanently(void){
1472
1409
error_t old_errno = errno;
1473
1410
error_t ret_errno = raise_privileges();
1477
1414
}
1478
1415
if(setuid(0) == -1){
1479
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1480
1418
}
1481
1419
errno = old_errno;
1482
1420
return ret_errno;
1483
1421
}
1484
1422
1485
1423
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
1424
error_t lower_privileges(void){
1488
1425
error_t old_errno = errno;
1489
1426
error_t ret_errno = 0;
1490
1427
if(seteuid(uid) == -1){
1491
1428
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,
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1511
1436
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__ */
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1539
1442
if(numhooks == -1){
1540
1443
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){
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1613
1451
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1618
1510
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;
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1662
1522
} 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);
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
1680
1559
}
1681
1560
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;
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1563
int sd = -1;
1564
int old_errno = errno;
1565
int ret_errno = 0;
1686
1566
int ret;
1687
1567
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1689
1569
if(if_index == 0){
1690
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
1571
errno = old_errno;
1697
1577
return EINTR;
1698
1578
}
1699
1579
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));
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1777
1632
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1633
ret_errno = errno;
1783
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1784
1645
errno = old_errno;
1785
return ioctl_errno;
1646
return ret_errno;
1786
1647
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
1648
}
1791
1792
1649
/* Sleep checking until interface is running.
1793
1650
Check every 0.25s, up to total time of delay */
1794
1651
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1796
1656
break;
1797
1657
}
1798
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1801
1661
perror_plus("nanosleep");
1802
1662
}
1803
1663
}
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;
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1818
1668
}
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));
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1865
1673
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);
1674
perror_plus("klogctl");
1675
}
1878
1676
}
1879
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1880
1680
errno = old_errno;
1881
1681
return 0;
1882
1682
}
1883
1683
1884
1684
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
1685
AvahiSServiceBrowser *sb = NULL;
1890
error_t ret_errno;
1686
int error;
1891
1687
int ret;
1892
1688
intmax_t tmpmax;
1893
1689
char *tmp;
1894
1690
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;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
1900
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
1698
const char *seckey = PATHDIR "/" SECKEY;
1902
1699
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1904
1700
1905
1701
bool gnutls_initialized = false;
1906
1702
bool gpgme_initialized = false;
1997
1793
connect_to = arg;
1998
1794
break;
1999
1795
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
}
1796
interface = arg;
2005
1797
break;
2006
1798
case 's': /* --seckey */
2007
1799
seckey = arg;
2084
1876
/* Work around Debian bug #633582:
2085
1877
<http://bugs.debian.org/633582> */
2086
1878
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");
2092
} else {
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
2093
1881
struct stat st;
2094
1882
2095
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2135
1923
}
2136
1924
2137
1925
/* 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;
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
2159
1930
}
2160
1931
}
2161
1932
}
2162
1933
2163
1934
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1937
}
1938
1939
if(not debug){
1940
avahi_set_log_function(empty_log);
1941
}
1942
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
2168
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
2169
1964
goto end;
2170
1965
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
2173
1972
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
2176
}
2177
2178
if(not debug){
2179
avahi_set_log_function(empty_log);
2180
1973
}
2181
1974
2182
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
1976
from the signal handler */
2184
1977
/* Initialize the pseudo-RNG for Avahi */
2185
1978
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
2188
1981
fprintf_plus(stderr,
2189
1982
"Avahi: Failed to create simple poll object.\n");
2190
1983
exitcode = EX_UNAVAILABLE;
2254
2047
}
2255
2048
}
2256
2049
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;
2306
}
2307
}
2308
break;
2309
}
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);
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2337
2057
}
2338
2058
2339
2059
if(quit_now){
2340
2060
goto end;
2341
2061
}
2342
2062
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2063
ret = init_gnutls_global(pubkey, seckey);
2344
2064
if(ret == -1){
2345
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
2066
exitcode = EX_UNAVAILABLE;
2353
2073
goto end;
2354
2074
}
2355
2075
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){
2076
if(mkdtemp(tempdir) == NULL){
2366
2077
perror_plus("mkdtemp");
2367
2078
goto end;
2368
2079
}
2080
tempdir_created = true;
2369
2081
2370
2082
if(quit_now){
2371
2083
goto end;
2372
2084
}
2373
2085
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2375
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2376
2088
exitcode = EX_UNAVAILABLE;
2377
2089
goto end;
2398
2110
goto end;
2399
2111
}
2400
2112
2401
in_port_t port;
2113
uint16_t port;
2402
2114
errno = 0;
2403
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2404
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2117
or tmpmax != (uint16_t)tmpmax){
2406
2118
fprintf_plus(stderr, "Bad port number\n");
2407
2119
exitcode = EX_USAGE;
2408
2120
goto end;
2409
2121
}
2410
2122
2411
2123
if(quit_now){
2412
2124
goto end;
2413
2125
}
2414
2126
2415
port = (in_port_t)tmpmax;
2127
port = (uint16_t)tmpmax;
2416
2128
*address = '\0';
2417
2129
/* Colon in address indicates IPv6 */
2418
2130
int af;
2434
2146
}
2435
2147
2436
2148
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
2149
ret = start_mandos_communication(address, port, if_index, af);
2439
2150
if(quit_now or ret == 0){
2440
2151
break;
2441
2152
}
2443
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
2155
(int)retry_interval);
2445
2156
}
2446
sleep((unsigned int)retry_interval);
2157
sleep((int)retry_interval);
2447
2158
}
2448
2159
2449
if(not quit_now){
2160
if (not quit_now){
2450
2161
exitcode = EXIT_SUCCESS;
2451
2162
}
2452
2163
2467
2178
config.publish_domain = 0;
2468
2179
2469
2180
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
2472
2184
2473
2185
/* Free the Avahi configuration data */
2474
2186
avahi_server_config_free(&config);
2477
2189
/* Check if creating the Avahi server object succeeded */
2478
2190
if(mc.server == NULL){
2479
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2192
avahi_strerror(error));
2481
2193
exitcode = EX_UNAVAILABLE;
2482
2194
goto end;
2483
2195
}
2489
2201
/* Create the Avahi service browser */
2490
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
2204
NULL, 0, browse_callback, NULL);
2494
2205
if(sb == NULL){
2495
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
2207
avahi_strerror(avahi_server_errno(mc.server)));
2507
2218
if(debug){
2508
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2509
2220
}
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2513
2224
if(debug){
2514
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
2226
(ret == 0) ? "successfully" : "with error");
2522
2233
}
2523
2234
2524
2235
/* Cleanup things */
2525
free(mc.interfaces);
2526
2527
2236
if(sb != NULL)
2528
2237
avahi_s_service_browser_free(sb);
2529
2238
2530
2239
if(mc.server != NULL)
2531
2240
avahi_server_free(mc.server);
2532
2241
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2535
2244
2536
2245
if(gnutls_initialized){
2537
2246
gnutls_certificate_free_credentials(mc.cred);
2554
2263
}
2555
2264
}
2556
2265
2557
/* Re-raise privileges */
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
2558
2270
{
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
}
2586
}
2271
raise_privileges();
2587
2272
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
}
2284
}
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2288
}
2592
2289
}
2593
2290
}
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2597
2297
2598
2298
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2299
if(tempdir_created){
2600
2300
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
}
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
direntry->d_name);
2310
if(ret < 0){
2311
perror_plus("asprintf");
2312
continue;
2313
}
2314
ret = remove(fullname);
2315
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2318
}
2319
free(fullname);
2637
2320
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
2327
}
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2639
2331
}
2640
2332
}
2641
2333
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0