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- Committer: Teddy Hogeborn
- Date: 2014-08-20 21:46:38 UTC
- Revision ID: teddy@recompile.se-20140820214638-k4naueej6hffdgfg
mandos-client: Bug fix: Check fork() return value.
When executing network hook scripts, check fork() return value.
* plugins.d/mandos-client.c (run_network_hooks): Bug fix: check if
fork() returns -1.
When executing network hook scripts, check fork() return value.
* plugins.d/mandos-client.c (run_network_hooks): Bug fix: check if
fork() returns -1.
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#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() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
170
178
171
179
/* Function to use when printing errors */
172
180
void perror_plus(const char *print_text){
181
int e = errno;
173
182
fprintf(stderr, "Mandos plugin %s: ",
174
183
program_invocation_short_name);
184
errno = e;
175
185
perror(print_text);
176
186
}
177
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
189
int fprintf_plus(FILE *stream, const char *format, ...){
179
190
va_list ap;
180
191
va_start (ap, format);
181
192
182
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
194
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
196
}
186
197
187
198
/*
189
200
* bytes. "buffer_capacity" is how much is currently allocated,
190
201
* "buffer_length" is how much is already used.
191
202
*/
203
__attribute__((nonnull, warn_unused_result))
192
204
size_t incbuffer(char **buffer, size_t buffer_length,
193
205
size_t buffer_capacity){
194
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
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;
197
213
return 0;
198
214
}
215
*buffer = new_buf;
199
216
buffer_capacity += BUFFER_SIZE;
200
217
}
201
218
return buffer_capacity;
202
219
}
203
220
204
221
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
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){
207
225
int ret;
208
226
server *new_server = malloc(sizeof(server));
209
227
if(new_server == NULL){
210
228
perror_plus("malloc");
211
return -1;
229
return false;
212
230
}
213
231
*new_server = (server){ .ip = strdup(ip),
214
232
.port = port,
216
234
.af = af };
217
235
if(new_server->ip == NULL){
218
236
perror_plus("strdup");
219
return -1;
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
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
220
253
}
221
254
/* Special case of first server */
222
if (mc.current_server == NULL){
255
if(*current_server == NULL){
223
256
new_server->next = new_server;
224
257
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
258
*current_server = new_server;
227
259
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
230
263
new_server->prev->next = 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 -1;
237
}
238
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
239
267
}
240
268
241
269
/*
242
270
* Initialize GPGME.
243
271
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
246
277
gpgme_error_t rc;
247
278
gpgme_engine_info_t engine_info;
248
279
249
250
280
/*
251
281
* Helper function to insert pub and seckey to the engine keyring.
252
282
*/
253
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
254
284
int ret;
255
285
int fd;
256
286
gpgme_data_t pgp_data;
268
298
return false;
269
299
}
270
300
271
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
272
302
if(rc != GPG_ERR_NO_ERROR){
273
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
304
gpgme_strsource(rc), gpgme_strerror(rc));
318
348
}
319
349
320
350
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
322
352
if(rc != GPG_ERR_NO_ERROR){
323
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
367
* Decrypt OpenPGP data.
338
368
* Returns -1 on error
339
369
*/
370
__attribute__((nonnull, warn_unused_result))
340
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
372
size_t crypto_size,
342
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
343
375
gpgme_data_t dh_crypto, dh_plain;
344
376
gpgme_error_t rc;
345
377
ssize_t ret;
371
403
372
404
/* Decrypt data from the cryptotext data buffer to the plaintext
373
405
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
407
if(rc != GPG_ERR_NO_ERROR){
376
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
409
gpgme_strsource(rc), gpgme_strerror(rc));
378
410
plaintext_length = -1;
379
411
if(debug){
380
412
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
382
414
if(result == NULL){
383
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
416
} else {
461
493
return plaintext_length;
462
494
}
463
495
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
467
499
if(ret == NULL)
468
500
ret = "(unknown)";
469
501
return ret;
470
502
}
471
503
472
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
473
506
static void debuggnutls(__attribute__((unused)) int level,
474
507
const char* string){
475
508
fprintf_plus(stderr, "GnuTLS: %s", string);
476
509
}
477
510
511
__attribute__((nonnull, warn_unused_result))
478
512
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
480
515
int ret;
481
516
482
517
if(debug){
499
534
}
500
535
501
536
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
538
if(ret != GNUTLS_E_SUCCESS){
504
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
540
safer_gnutls_strerror(ret));
515
550
}
516
551
517
552
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
519
554
GNUTLS_OPENPGP_FMT_BASE64);
520
555
if(ret != GNUTLS_E_SUCCESS){
521
556
fprintf_plus(stderr,
527
562
}
528
563
529
564
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
531
566
if(ret != GNUTLS_E_SUCCESS){
532
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
568
" initialization: %s\n",
534
569
safer_gnutls_strerror(ret));
535
570
goto globalfail;
536
571
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
573
if(ret != GNUTLS_E_SUCCESS){
539
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
575
safer_gnutls_strerror(ret));
541
576
goto globalfail;
542
577
}
543
578
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
580
546
581
return 0;
547
582
548
583
globalfail:
549
584
550
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
551
586
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
553
588
return -1;
554
589
}
555
590
556
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
557
594
int ret;
558
595
/* GnuTLS session creation */
559
596
do {
571
608
{
572
609
const char *err;
573
610
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
612
if(quit_now){
576
613
gnutls_deinit(*session);
577
614
return -1;
588
625
589
626
do {
590
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
628
mc->cred);
592
629
if(quit_now){
593
630
gnutls_deinit(*session);
594
631
return -1;
604
641
/* ignore client certificate if any. */
605
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
643
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
645
609
646
return 0;
610
647
}
614
651
__attribute__((unused)) const char *txt){}
615
652
616
653
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
618
656
AvahiIfIndex if_index,
619
int af){
657
int af, mandos_context *mc){
620
658
int ret, tcp_sd = -1;
621
659
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
660
struct sockaddr_storage to;
626
661
char *buffer = NULL;
627
662
char *decrypted_buffer = NULL;
628
663
size_t buffer_length = 0;
652
687
return -1;
653
688
}
654
689
655
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
656
723
if(ret != 0){
657
724
return -1;
658
725
}
659
726
660
727
if(debug){
661
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
729
PRIuMAX "\n", ip, (uintmax_t)port);
663
730
}
664
731
665
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
677
744
678
745
memset(&to, 0, sizeof(to));
679
746
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
682
749
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
685
752
}
686
753
if(ret < 0 ){
687
754
int e = errno;
696
763
goto mandos_end;
697
764
}
698
765
if(af == AF_INET6){
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*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
769
if(if_index == AVAHI_IF_UNSPEC){
707
770
fprintf_plus(stderr, "An IPv6 link-local address is"
708
771
" incomplete without a network interface\n");
710
773
goto mandos_end;
711
774
}
712
775
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
777
}
715
778
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
780
}
720
781
721
782
if(quit_now){
729
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
791
perror_plus("if_indextoname");
731
792
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
734
795
}
735
796
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
738
799
}
739
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
802
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
745
807
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
748
812
}
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
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
819
}
756
820
}
757
821
761
825
}
762
826
763
827
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
765
830
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
767
833
}
768
834
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
836
int e = errno;
771
837
perror_plus("connect");
772
838
errno = e;
818
884
goto mandos_end;
819
885
}
820
886
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
823
892
824
893
if(quit_now){
825
894
errno = EINTR;
930
999
if(buffer_length > 0){
931
1000
ssize_t decrypted_buffer_size;
932
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
1002
&decrypted_buffer, mc);
934
1003
if(decrypted_buffer_size >= 0){
935
1004
936
1005
written = 0;
984
1053
return retval;
985
1054
}
986
1055
1056
__attribute__((nonnull))
987
1057
static void resolve_callback(AvahiSServiceResolver *r,
988
1058
AvahiIfIndex interface,
989
1059
AvahiProtocol proto,
997
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1069
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1002
1074
1003
1075
/* Called whenever a service has been resolved successfully or
1004
1076
timed out */
1005
1077
1006
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1007
1080
return;
1008
1081
}
1009
1082
1013
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1088
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1017
1091
break;
1018
1092
1019
1093
case AVAHI_RESOLVER_FOUND:
1025
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1100
host_name, ip, (intmax_t)interface, port);
1027
1101
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1030
1106
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1032
1108
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
1035
1115
}
1036
1116
}
1037
1117
}
1047
1127
const char *domain,
1048
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1129
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1052
1134
1053
1135
/* Called whenever a new services becomes available on the LAN or
1054
1136
is removed from the LAN */
1062
1144
case AVAHI_BROWSER_FAILURE:
1063
1145
1064
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1067
1150
return;
1068
1151
1069
1152
case AVAHI_BROWSER_NEW:
1072
1155
the callback function is called the Avahi server will free the
1073
1156
resolver for us. */
1074
1157
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1078
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1163
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1081
1166
break;
1082
1167
1083
1168
case AVAHI_BROWSER_REMOVE:
1102
1187
signal_received = sig;
1103
1188
int old_errno = errno;
1104
1189
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1107
1192
}
1108
1193
errno = old_errno;
1109
1194
}
1110
1195
1196
__attribute__((nonnull, warn_unused_result))
1111
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1198
int ret;
1199
error_t ret_errno;
1113
1200
1114
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1202
if(s < 0){
1203
ret_errno = errno;
1116
1204
perror_plus("socket");
1205
errno = ret_errno;
1117
1206
return false;
1118
1207
}
1119
1208
strcpy(ifr->ifr_name, ifname);
1120
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1210
if(ret == -1){
1122
1211
if(debug){
1212
ret_errno = errno;
1123
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1124
1215
}
1125
1216
return false;
1126
1217
}
1127
1218
return true;
1128
1219
}
1129
1220
1221
__attribute__((nonnull, warn_unused_result))
1130
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1223
1132
1224
/* Reject the loopback device */
1174
1266
* corresponds to an acceptable network device.
1175
1267
* (This function is passed to scandir(3) as a filter function.)
1176
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1177
1270
int good_interface(const struct dirent *if_entry){
1178
1271
if(if_entry->d_name[0] == '.'){
1179
1272
return 0;
1195
1288
}
1196
1289
1197
1290
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1240
1325
int notdotentries(const struct dirent *direntry){
1241
1326
/* Skip "." and ".." */
1242
1327
if(direntry->d_name[0] == '.'
1249
1334
}
1250
1335
1251
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1252
1338
int runnable_hook(const struct dirent *direntry){
1253
1339
int ret;
1254
1340
size_t sret;
1262
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
1349
"abcdefghijklmnopqrstuvwxyz"
1264
1350
"0123456789"
1265
"_-");
1351
"_.-");
1266
1352
if((direntry->d_name)[sret] != '\0'){
1267
1353
/* Contains non-allowed characters */
1268
1354
if(debug){
1272
1358
return 0;
1273
1359
}
1274
1360
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1283
1362
if(ret == -1){
1284
1363
if(debug){
1285
1364
perror_plus("Could not stat hook");
1309
1388
return 1;
1310
1389
}
1311
1390
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1313
1394
int ret;
1314
1395
struct timespec now;
1315
1396
struct timespec waited_time;
1316
1397
intmax_t block_time;
1317
1398
1318
1399
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1400
if(mc->current_server == NULL){
1401
if(debug){
1321
1402
fprintf_plus(stderr, "Wait until first server is found."
1322
1403
" No timeout!\n");
1323
1404
}
1324
1405
ret = avahi_simple_poll_iterate(s, -1);
1325
1406
} else {
1326
if (debug){
1407
if(debug){
1327
1408
fprintf_plus(stderr, "Check current_server if we should run"
1328
1409
" it, or wait\n");
1329
1410
}
1336
1417
/* Calculating in ms how long time between now and server
1337
1418
who we visted longest time ago. Now - last seen. */
1338
1419
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1420
- mc->current_server->last_seen.tv_sec);
1340
1421
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1422
- mc->current_server->last_seen.tv_nsec);
1342
1423
/* total time is 10s/10,000ms.
1343
1424
Converting to s from ms by dividing by 1,000,
1344
1425
and ns to ms by dividing by 1,000,000. */
1346
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1429
1349
if (debug){
1430
if(debug){
1350
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
1432
block_time);
1352
1433
}
1353
1434
1354
1435
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1359
1440
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1441
avahi_simple_poll_quit(s);
1361
1442
return 0;
1362
1443
}
1363
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1445
&mc->current_server->last_seen);
1365
1446
if(ret == -1){
1366
1447
perror_plus("clock_gettime");
1367
1448
return -1;
1368
1449
}
1369
mc.current_server = mc.current_server->next;
1450
mc->current_server = mc->current_server->next;
1370
1451
block_time = 0; /* Call avahi to find new Mandos
1371
1452
servers, but don't block */
1372
1453
}
1374
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1456
}
1376
1457
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1458
if(ret > 0 or errno != EINTR){
1378
1459
return (ret != 1) ? ret : 0;
1379
1460
}
1380
1461
}
1381
1462
}
1382
1463
}
1383
1464
1384
bool run_network_hooks(const char *mode, const char *interface,
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1385
1519
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1391
1547
if(numhooks == -1){
1392
1548
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1400
1621
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1469
1626
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1678
} else {
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1698
}
1699
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
1704
int ret;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1707
if(if_index == 0){
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1709
errno = old_errno;
1710
return ENXIO;
1711
}
1712
1713
if(quit_now){
1714
errno = old_errno;
1715
return EINTR;
1716
}
1717
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1721
ret_errno = errno;
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1725
return ret_errno;
1726
}
1727
network.ifr_flags |= IFF_UP; /* set flag */
1728
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1731
ret_errno = errno;
1732
perror_plus("socket");
1733
errno = old_errno;
1734
return ret_errno;
1735
}
1736
1737
if(quit_now){
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
errno = old_errno;
1743
return EINTR;
1744
}
1745
1746
if(debug){
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1748
interface);
1749
}
1750
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1757
1758
#ifdef __linux__
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1770
}
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1774
#ifdef __linux__
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1779
}
1780
}
1781
#endif /* __linux__ */
1782
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1792
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1795
if(ret == -1){
1796
perror_plus("close");
1797
}
1798
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1802
errno = old_errno;
1803
return ioctl_errno;
1804
}
1805
} else if(debug){
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1807
interface);
1808
}
1809
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1814
break;
1815
}
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1820
}
1821
}
1822
1823
errno = old_errno;
1824
return 0;
1825
}
1826
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1832
if(if_index == 0){
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1834
errno = old_errno;
1835
return ENXIO;
1836
}
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1840
ret_errno = errno;
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1844
return ret_errno;
1845
}
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1847
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1850
ret_errno = errno;
1851
perror_plus("socket");
1852
errno = old_errno;
1853
return ret_errno;
1854
}
1855
1856
if(debug){
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1858
interface);
1859
}
1860
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1880
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1883
if(ret == -1){
1884
perror_plus("close");
1885
}
1886
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1890
errno = old_errno;
1891
return ioctl_errno;
1892
}
1893
} else if(debug){
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1895
interface);
1896
}
1897
1898
errno = old_errno;
1899
return 0;
1509
1900
}
1510
1901
1511
1902
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1512
1907
AvahiSServiceBrowser *sb = NULL;
1513
int error;
1908
error_t ret_errno;
1514
1909
int ret;
1515
1910
intmax_t tmpmax;
1516
1911
char *tmp;
1517
1912
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1526
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
1919
const char *seckey = PATHDIR "/" SECKEY;
1528
1920
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
1529
1922
1530
1923
bool gnutls_initialized = false;
1531
1924
bool gpgme_initialized = false;
1593
1986
.group = 2 },
1594
1987
{ .name = "retry", .key = 132,
1595
1988
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1989
.doc = "Retry interval used when denied by the Mandos server",
1597
1990
.group = 2 },
1598
1991
{ .name = "network-hook-dir", .key = 133,
1599
1992
.arg = "DIR",
1622
2015
connect_to = arg;
1623
2016
break;
1624
2017
case 'i': /* --interface */
1625
interface = arg;
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
2020
if(ret_errno != 0){
2021
argp_error(state, "%s", strerror(ret_errno));
2022
}
1626
2023
break;
1627
2024
case 's': /* --seckey */
1628
2025
seckey = arg;
1671
2068
argp_state_help(state, state->out_stream,
1672
2069
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
2070
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
2071
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
2072
exit(argp_err_exit_status);
1678
2073
break;
1707
2102
/* Work around Debian bug #633582:
1708
2103
<http://bugs.debian.org/633582> */
1709
2104
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
1715
2110
} else {
1716
2111
struct stat st;
1717
2112
1758
2153
}
1759
2154
1760
2155
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2160
}
2161
}
2162
}
2163
2164
/* Remove invalid interface names (except "none") */
2165
{
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2168
interface))){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2174
}
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
interface = NULL;
1765
2177
}
1766
2178
}
1767
2179
}
1768
2180
1769
2181
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2182
{
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
2187
goto end;
2188
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
1772
2194
}
1773
2195
1774
2196
if(not debug){
1775
2197
avahi_set_log_function(empty_log);
1776
2198
}
1777
2199
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
2200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
2201
from the signal handler */
1812
2202
/* Initialize the pseudo-RNG for Avahi */
1813
2203
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
1816
2206
fprintf_plus(stderr,
1817
2207
"Avahi: Failed to create simple poll object.\n");
1818
2208
exitcode = EX_UNAVAILABLE;
1882
2272
}
1883
2273
}
1884
2274
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2280
alphasort);
2281
if(ret >= 1){
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2290
continue;
2291
}
2292
if(debug){
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2295
}
2296
free(direntries[i]);
2297
}
2298
free(direntries);
2299
} else {
2300
if(ret == 0){
2301
free(direntries);
2302
}
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2305
goto end;
2306
}
2307
}
2308
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
1970
2326
}
1971
2327
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
1989
2328
break;
1990
2329
}
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2333
if(errno != 0){
2334
perror_plus("Failed to bring up interface");
2335
} else {
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2342
}
2343
}
2344
}
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2347
}
2348
}
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2020
2357
}
2021
2358
2022
2359
if(quit_now){
2023
2360
goto end;
2024
2361
}
2025
2362
2026
ret = init_gnutls_global(pubkey, seckey);
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2027
2364
if(ret == -1){
2028
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
2366
exitcode = EX_UNAVAILABLE;
2036
2373
goto end;
2037
2374
}
2038
2375
2039
if(mkdtemp(tempdir) == NULL){
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2040
2386
perror_plus("mkdtemp");
2041
2387
goto end;
2042
2388
}
2043
tempdir_created = true;
2044
2389
2045
2390
if(quit_now){
2046
2391
goto end;
2047
2392
}
2048
2393
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2394
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2050
2395
fprintf_plus(stderr, "init_gpgme failed\n");
2051
2396
exitcode = EX_UNAVAILABLE;
2052
2397
goto end;
2062
2407
/* Connect directly, do not use Zeroconf */
2063
2408
/* (Mainly meant for debugging) */
2064
2409
char *address = strrchr(connect_to, ':');
2410
2065
2411
if(address == NULL){
2066
2412
fprintf_plus(stderr, "No colon in address\n");
2067
2413
exitcode = EX_USAGE;
2072
2418
goto end;
2073
2419
}
2074
2420
2075
uint16_t port;
2421
in_port_t port;
2076
2422
errno = 0;
2077
2423
tmpmax = strtoimax(address+1, &tmp, 10);
2078
2424
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2425
or tmpmax != (in_port_t)tmpmax){
2080
2426
fprintf_plus(stderr, "Bad port number\n");
2081
2427
exitcode = EX_USAGE;
2082
2428
goto end;
2083
2429
}
2084
2430
2085
2431
if(quit_now){
2086
2432
goto end;
2087
2433
}
2088
2434
2089
port = (uint16_t)tmpmax;
2435
port = (in_port_t)tmpmax;
2090
2436
*address = '\0';
2091
2437
/* Colon in address indicates IPv6 */
2092
2438
int af;
2108
2454
}
2109
2455
2110
2456
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2457
ret = start_mandos_communication(address, port, if_index, af,
2458
&mc);
2112
2459
if(quit_now or ret == 0){
2113
2460
break;
2114
2461
}
2116
2463
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
2464
(int)retry_interval);
2118
2465
}
2119
sleep((int)retry_interval);
2466
sleep((unsigned int)retry_interval);
2120
2467
}
2121
2468
2122
if (not quit_now){
2469
if(not quit_now){
2123
2470
exitcode = EXIT_SUCCESS;
2124
2471
}
2125
2472
2140
2487
config.publish_domain = 0;
2141
2488
2142
2489
/* Allocate a new server */
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2491
&config, NULL, NULL, &ret_errno);
2146
2492
2147
2493
/* Free the Avahi configuration data */
2148
2494
avahi_server_config_free(&config);
2151
2497
/* Check if creating the Avahi server object succeeded */
2152
2498
if(mc.server == NULL){
2153
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2500
avahi_strerror(ret_errno));
2155
2501
exitcode = EX_UNAVAILABLE;
2156
2502
goto end;
2157
2503
}
2163
2509
/* Create the Avahi service browser */
2164
2510
sb = avahi_s_service_browser_new(mc.server, if_index,
2165
2511
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
NULL, 0, browse_callback, NULL);
2512
NULL, 0, browse_callback,
2513
(void *)&mc);
2167
2514
if(sb == NULL){
2168
2515
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
2516
avahi_strerror(avahi_server_errno(mc.server)));
2180
2527
if(debug){
2181
2528
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
2529
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2530
2531
ret = avahi_loop_with_timeout(simple_poll,
2532
(int)(retry_interval * 1000), &mc);
2186
2533
if(debug){
2187
2534
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
2535
(ret == 0) ? "successfully" : "with error");
2195
2542
}
2196
2543
2197
2544
/* Cleanup things */
2545
free(mc.interfaces);
2546
2198
2547
if(sb != NULL)
2199
2548
avahi_s_service_browser_free(sb);
2200
2549
2201
2550
if(mc.server != NULL)
2202
2551
avahi_server_free(mc.server);
2203
2552
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2553
if(simple_poll != NULL)
2554
avahi_simple_poll_free(simple_poll);
2206
2555
2207
2556
if(gnutls_initialized){
2208
2557
gnutls_certificate_free_credentials(mc.cred);
2220
2569
mc.current_server->prev->next = NULL;
2221
2570
while(mc.current_server != NULL){
2222
2571
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2223
2580
free(mc.current_server);
2224
2581
mc.current_server = next;
2225
2582
}
2226
2583
}
2227
2584
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2585
/* Re-raise privileges */
2232
2586
{
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2237
2614
}
2238
2615
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2255
2620
}
2256
2621
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2622
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2263
2625
2264
2626
/* Removes the GPGME temp directory and all files inside */
2265
if(tempdir_created){
2627
if(tempdir != NULL){
2266
2628
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
direntry->d_name);
2276
if(ret < 0){
2277
perror_plus("asprintf");
2278
continue;
2279
}
2280
ret = remove(fullname);
2281
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2284
}
2285
free(fullname);
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2286
2666
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
2293
}
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2297
2668
}
2298
2669
}
2299
2670
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0