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- Committer: Teddy Hogeborn
- Date: 2011-11-28 22:15:04 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111128221504-aij86bkvdafxino5
* Makefile (install-client-nokey): Create network hook directory.
* debian/mandos-client.README.Debian: Corrected mail address.
* debian/mandos-client.README.Debian: Corrected mail address.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
178
int fprintf_plus(FILE *stream, const char *format, ...){
190
179
va_list ap;
191
180
va_start (ap, format);
192
181
193
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
183
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
185
}
197
186
198
187
/*
200
189
* bytes. "buffer_capacity" is how much is currently allocated,
201
190
* "buffer_length" is how much is already used.
202
191
*/
203
__attribute__((nonnull, warn_unused_result))
204
192
size_t incbuffer(char **buffer, size_t buffer_length,
205
193
size_t buffer_capacity){
206
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
213
197
return 0;
214
198
}
215
*buffer = new_buf;
216
199
buffer_capacity += BUFFER_SIZE;
217
200
}
218
201
return buffer_capacity;
219
202
}
220
203
221
204
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
225
207
int ret;
226
208
server *new_server = malloc(sizeof(server));
227
209
if(new_server == NULL){
228
210
perror_plus("malloc");
229
return false;
211
return -1;
230
212
}
231
213
*new_server = (server){ .ip = strdup(ip),
232
214
.port = port,
234
216
.af = af };
235
217
if(new_server->ip == NULL){
236
218
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#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;
219
return -1;
253
220
}
254
221
/* Special case of first server */
255
if(*current_server == NULL){
222
if (mc.current_server == NULL){
256
223
new_server->next = new_server;
257
224
new_server->prev = new_server;
258
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
259
227
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
263
230
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
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;
267
239
}
268
240
269
241
/*
270
242
* Initialize GPGME.
271
243
*/
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){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
277
246
gpgme_error_t rc;
278
247
gpgme_engine_info_t engine_info;
279
248
249
280
250
/*
281
251
* Helper function to insert pub and seckey to the engine keyring.
282
252
*/
283
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
284
254
int ret;
285
255
int fd;
286
256
gpgme_data_t pgp_data;
298
268
return false;
299
269
}
300
270
301
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
302
272
if(rc != GPG_ERR_NO_ERROR){
303
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
274
gpgme_strsource(rc), gpgme_strerror(rc));
348
318
}
349
319
350
320
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
352
322
if(rc != GPG_ERR_NO_ERROR){
353
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
337
* Decrypt OpenPGP data.
368
338
* Returns -1 on error
369
339
*/
370
__attribute__((nonnull, warn_unused_result))
371
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
341
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
342
char **plaintext){
375
343
gpgme_data_t dh_crypto, dh_plain;
376
344
gpgme_error_t rc;
377
345
ssize_t ret;
403
371
404
372
/* Decrypt data from the cryptotext data buffer to the plaintext
405
373
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
375
if(rc != GPG_ERR_NO_ERROR){
408
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
377
gpgme_strsource(rc), gpgme_strerror(rc));
410
378
plaintext_length = -1;
411
379
if(debug){
412
380
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
414
382
if(result == NULL){
415
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
384
} else {
493
461
return plaintext_length;
494
462
}
495
463
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
499
467
if(ret == NULL)
500
468
ret = "(unknown)";
501
469
return ret;
502
470
}
503
471
504
472
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
473
static void debuggnutls(__attribute__((unused)) int level,
507
474
const char* string){
508
475
fprintf_plus(stderr, "GnuTLS: %s", string);
509
476
}
510
477
511
__attribute__((nonnull, warn_unused_result))
512
478
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
479
const char *seckeyfilename){
515
480
int ret;
516
481
517
482
if(debug){
534
499
}
535
500
536
501
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
503
if(ret != GNUTLS_E_SUCCESS){
539
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
505
safer_gnutls_strerror(ret));
550
515
}
551
516
552
517
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
554
519
GNUTLS_OPENPGP_FMT_BASE64);
555
520
if(ret != GNUTLS_E_SUCCESS){
556
521
fprintf_plus(stderr,
562
527
}
563
528
564
529
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
566
531
if(ret != GNUTLS_E_SUCCESS){
567
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
533
" initialization: %s\n",
569
534
safer_gnutls_strerror(ret));
570
535
goto globalfail;
571
536
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
538
if(ret != GNUTLS_E_SUCCESS){
574
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
540
safer_gnutls_strerror(ret));
576
541
goto globalfail;
577
542
}
578
543
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
545
581
546
return 0;
582
547
583
548
globalfail:
584
549
585
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
586
551
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
588
553
return -1;
589
554
}
590
555
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
594
557
int ret;
595
558
/* GnuTLS session creation */
596
559
do {
608
571
{
609
572
const char *err;
610
573
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
575
if(quit_now){
613
576
gnutls_deinit(*session);
614
577
return -1;
625
588
626
589
do {
627
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
591
mc.cred);
629
592
if(quit_now){
630
593
gnutls_deinit(*session);
631
594
return -1;
641
604
/* ignore client certificate if any. */
642
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
606
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
608
646
609
return 0;
647
610
}
651
614
__attribute__((unused)) const char *txt){}
652
615
653
616
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
656
618
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
619
int af){
658
620
int ret, tcp_sd = -1;
659
621
ssize_t sret;
660
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
661
626
char *buffer = NULL;
662
627
char *decrypted_buffer = NULL;
663
628
size_t buffer_length = 0;
687
652
return -1;
688
653
}
689
654
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);
655
ret = init_gnutls_session(&session);
723
656
if(ret != 0){
724
657
return -1;
725
658
}
726
659
727
660
if(debug){
728
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
730
663
}
731
664
732
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
677
745
678
memset(&to, 0, sizeof(to));
746
679
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
682
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
752
685
}
753
686
if(ret < 0 ){
754
687
int e = errno;
763
696
goto mandos_end;
764
697
}
765
698
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
769
706
if(if_index == AVAHI_IF_UNSPEC){
770
707
fprintf_plus(stderr, "An IPv6 link-local address is"
771
708
" incomplete without a network interface\n");
773
710
goto mandos_end;
774
711
}
775
712
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
777
714
}
778
715
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
780
719
}
781
720
782
721
if(quit_now){
790
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
730
perror_plus("if_indextoname");
792
731
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
795
734
}
796
735
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
799
738
}
800
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
802
742
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
807
745
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
812
748
}
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);
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
}
819
755
}
820
756
}
821
757
825
761
}
826
762
827
763
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
765
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
767
}
834
768
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
770
int e = errno;
837
771
perror_plus("connect");
838
772
errno = e;
884
818
goto mandos_end;
885
819
}
886
820
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);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
892
823
893
824
if(quit_now){
894
825
errno = EINTR;
999
930
if(buffer_length > 0){
1000
931
ssize_t decrypted_buffer_size;
1001
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
933
&decrypted_buffer);
1003
934
if(decrypted_buffer_size >= 0){
1004
935
1005
936
written = 0;
1053
984
return retval;
1054
985
}
1055
986
1056
__attribute__((nonnull))
1057
987
static void resolve_callback(AvahiSServiceResolver *r,
1058
988
AvahiIfIndex interface,
1059
989
AvahiProtocol proto,
1067
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
999
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1074
1002
1075
1003
/* Called whenever a service has been resolved successfully or
1076
1004
timed out */
1077
1005
1078
1006
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
1007
return;
1081
1008
}
1082
1009
1086
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
1015
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1091
1017
break;
1092
1018
1093
1019
case AVAHI_RESOLVER_FOUND:
1099
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
1026
host_name, ip, (intmax_t)interface, port);
1101
1027
}
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1106
1030
if(ret == 0){
1107
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1108
1032
} else {
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
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1115
1035
}
1116
1036
}
1117
1037
}
1127
1047
const char *domain,
1128
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1129
1049
flags,
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1134
1052
1135
1053
/* Called whenever a new services becomes available on the LAN or
1136
1054
is removed from the LAN */
1144
1062
case AVAHI_BROWSER_FAILURE:
1145
1063
1146
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1150
1067
return;
1151
1068
1152
1069
case AVAHI_BROWSER_NEW:
1155
1072
the callback function is called the Avahi server will free the
1156
1073
resolver for us. */
1157
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1162
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
1079
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1166
1081
break;
1167
1082
1168
1083
case AVAHI_BROWSER_REMOVE:
1187
1102
signal_received = sig;
1188
1103
int old_errno = errno;
1189
1104
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1192
1107
}
1193
1108
errno = old_errno;
1194
1109
}
1195
1110
1196
__attribute__((nonnull, warn_unused_result))
1197
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
1112
int ret;
1199
error_t ret_errno;
1200
1113
1201
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1115
if(s < 0){
1203
ret_errno = errno;
1204
1116
perror_plus("socket");
1205
errno = ret_errno;
1206
1117
return false;
1207
1118
}
1208
1119
strcpy(ifr->ifr_name, ifname);
1209
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
1121
if(ret == -1){
1211
1122
if(debug){
1212
ret_errno = errno;
1213
1123
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
1124
}
1216
1125
return false;
1217
1126
}
1218
1127
return true;
1219
1128
}
1220
1129
1221
__attribute__((nonnull, warn_unused_result))
1222
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1131
1224
1132
/* Reject the loopback device */
1266
1174
* corresponds to an acceptable network device.
1267
1175
* (This function is passed to scandir(3) as a filter function.)
1268
1176
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
1177
int good_interface(const struct dirent *if_entry){
1271
1178
if(if_entry->d_name[0] == '.'){
1272
1179
return 0;
1288
1195
}
1289
1196
1290
1197
/*
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))
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
1325
1240
int notdotentries(const struct dirent *direntry){
1326
1241
/* Skip "." and ".." */
1327
1242
if(direntry->d_name[0] == '.'
1334
1249
}
1335
1250
1336
1251
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
1252
int runnable_hook(const struct dirent *direntry){
1339
1253
int ret;
1340
1254
size_t sret;
1348
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
1263
"abcdefghijklmnopqrstuvwxyz"
1350
1264
"0123456789"
1351
"_.-");
1265
"_-");
1352
1266
if((direntry->d_name)[sret] != '\0'){
1353
1267
/* Contains non-allowed characters */
1354
1268
if(debug){
1358
1272
return 0;
1359
1273
}
1360
1274
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1362
1283
if(ret == -1){
1363
1284
if(debug){
1364
1285
perror_plus("Could not stat hook");
1388
1309
return 1;
1389
1310
}
1390
1311
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1394
1313
int ret;
1395
1314
struct timespec now;
1396
1315
struct timespec waited_time;
1397
1316
intmax_t block_time;
1398
1317
1399
1318
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1402
1321
fprintf_plus(stderr, "Wait until first server is found."
1403
1322
" No timeout!\n");
1404
1323
}
1405
1324
ret = avahi_simple_poll_iterate(s, -1);
1406
1325
} else {
1407
if(debug){
1326
if (debug){
1408
1327
fprintf_plus(stderr, "Check current_server if we should run"
1409
1328
" it, or wait\n");
1410
1329
}
1417
1336
/* Calculating in ms how long time between now and server
1418
1337
who we visted longest time ago. Now - last seen. */
1419
1338
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1421
1340
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1423
1342
/* total time is 10s/10,000ms.
1424
1343
Converting to s from ms by dividing by 1,000,
1425
1344
and ns to ms by dividing by 1,000,000. */
1427
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1428
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1348
1430
if(debug){
1349
if (debug){
1431
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
1351
block_time);
1433
1352
}
1434
1353
1435
1354
if(block_time <= 0){
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);
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);
1440
1359
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1442
1361
return 0;
1443
1362
}
1444
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1446
1365
if(ret == -1){
1447
1366
perror_plus("clock_gettime");
1448
1367
return -1;
1449
1368
}
1450
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1451
1370
block_time = 0; /* Call avahi to find new Mandos
1452
1371
servers, but don't block */
1453
1372
}
1455
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
1375
}
1457
1376
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1459
1378
return (ret != 1) ? ret : 0;
1460
1379
}
1461
1380
}
1462
1381
}
1463
1382
}
1464
1383
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,
1384
bool run_network_hooks(const char *mode, const char *interface,
1519
1385
const float delay){
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__ */
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1547
1391
if(numhooks == -1){
1548
1392
perror_plus("scandir");
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){
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){
1621
1400
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
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
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1626
1471
free(delaystring);
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
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1673
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1693
}
1694
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1699
int ret;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1702
if(if_index == 0){
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
errno = old_errno;
1705
return ENXIO;
1706
}
1707
1708
if(quit_now){
1709
errno = old_errno;
1710
return EINTR;
1711
}
1712
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1790
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1797
errno = old_errno;
1798
return ioctl_errno;
1799
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
}
1804
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1809
break;
1810
}
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1815
}
1816
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1831
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1878
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1891
}
1892
1893
errno = old_errno;
1894
return 0;
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1895
1511
}
1896
1512
1897
1513
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1902
1514
AvahiSServiceBrowser *sb = NULL;
1903
error_t ret_errno;
1515
int error;
1904
1516
int ret;
1905
1517
intmax_t tmpmax;
1906
1518
char *tmp;
1907
1519
int exitcode = EXIT_SUCCESS;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
1913
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1914
1529
const char *seckey = PATHDIR "/" SECKEY;
1915
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1917
1531
1918
1532
bool gnutls_initialized = false;
1919
1533
bool gpgme_initialized = false;
1981
1595
.group = 2 },
1982
1596
{ .name = "retry", .key = 132,
1983
1597
.arg = "SECONDS",
1984
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
1985
1599
.group = 2 },
1986
1600
{ .name = "network-hook-dir", .key = 133,
1987
1601
.arg = "DIR",
2010
1624
connect_to = arg;
2011
1625
break;
2012
1626
case 'i': /* --interface */
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
1627
interface = arg;
2018
1628
break;
2019
1629
case 's': /* --seckey */
2020
1630
seckey = arg;
2063
1673
argp_state_help(state, state->out_stream,
2064
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2065
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
2066
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2067
1679
exit(argp_err_exit_status);
2068
1680
break;
2097
1709
/* Work around Debian bug #633582:
2098
1710
<http://bugs.debian.org/633582> */
2099
1711
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2105
1717
} else {
2106
1718
struct stat st;
2107
1719
2148
1760
}
2149
1761
2150
1762
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2172
1767
}
2173
1768
}
2174
1769
}
2175
1770
2176
1771
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
2182
goto end;
2183
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2186
}
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2189
1774
}
2190
1775
2191
1776
if(not debug){
2192
1777
avahi_set_log_function(empty_log);
2193
1778
}
2194
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2195
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2196
1813
from the signal handler */
2197
1814
/* Initialize the pseudo-RNG for Avahi */
2198
1815
srand((unsigned int) time(NULL));
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2201
1818
fprintf_plus(stderr,
2202
1819
"Avahi: Failed to create simple poll object.\n");
2203
1820
exitcode = EX_UNAVAILABLE;
2267
1884
}
2268
1885
}
2269
1886
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2321
1972
}
2322
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
2323
1991
break;
2324
1992
}
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2352
2022
}
2353
2023
2354
2024
if(quit_now){
2355
2025
goto end;
2356
2026
}
2357
2027
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2359
2029
if(ret == -1){
2360
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2361
2031
exitcode = EX_UNAVAILABLE;
2368
2038
goto end;
2369
2039
}
2370
2040
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
2041
if(mkdtemp(tempdir) == NULL){
2381
2042
perror_plus("mkdtemp");
2382
2043
goto end;
2383
2044
}
2045
tempdir_created = true;
2384
2046
2385
2047
if(quit_now){
2386
2048
goto end;
2387
2049
}
2388
2050
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2390
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2391
2053
exitcode = EX_UNAVAILABLE;
2392
2054
goto end;
2402
2064
/* Connect directly, do not use Zeroconf */
2403
2065
/* (Mainly meant for debugging) */
2404
2066
char *address = strrchr(connect_to, ':');
2405
2406
2067
if(address == NULL){
2407
2068
fprintf_plus(stderr, "No colon in address\n");
2408
2069
exitcode = EX_USAGE;
2413
2074
goto end;
2414
2075
}
2415
2076
2416
in_port_t port;
2077
uint16_t port;
2417
2078
errno = 0;
2418
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2419
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2420
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2421
2082
fprintf_plus(stderr, "Bad port number\n");
2422
2083
exitcode = EX_USAGE;
2423
2084
goto end;
2424
2085
}
2425
2086
2426
2087
if(quit_now){
2427
2088
goto end;
2428
2089
}
2429
2090
2430
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2431
2092
*address = '\0';
2432
2093
/* Colon in address indicates IPv6 */
2433
2094
int af;
2449
2110
}
2450
2111
2451
2112
while(not quit_now){
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2454
2114
if(quit_now or ret == 0){
2455
2115
break;
2456
2116
}
2458
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
2119
(int)retry_interval);
2460
2120
}
2461
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2462
2122
}
2463
2123
2464
if(not quit_now){
2124
if (not quit_now){
2465
2125
exitcode = EXIT_SUCCESS;
2466
2126
}
2467
2127
2482
2142
config.publish_domain = 0;
2483
2143
2484
2144
/* Allocate a new server */
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2487
2148
2488
2149
/* Free the Avahi configuration data */
2489
2150
avahi_server_config_free(&config);
2492
2153
/* Check if creating the Avahi server object succeeded */
2493
2154
if(mc.server == NULL){
2494
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2496
2157
exitcode = EX_UNAVAILABLE;
2497
2158
goto end;
2498
2159
}
2504
2165
/* Create the Avahi service browser */
2505
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2506
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2509
2169
if(sb == NULL){
2510
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
2171
avahi_strerror(avahi_server_errno(mc.server)));
2522
2182
if(debug){
2523
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2524
2184
}
2525
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2528
2188
if(debug){
2529
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
2190
(ret == 0) ? "successfully" : "with error");
2537
2197
}
2538
2198
2539
2199
/* Cleanup things */
2540
free(mc.interfaces);
2541
2542
2200
if(sb != NULL)
2543
2201
avahi_s_service_browser_free(sb);
2544
2202
2545
2203
if(mc.server != NULL)
2546
2204
avahi_server_free(mc.server);
2547
2205
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2550
2208
2551
2209
if(gnutls_initialized){
2552
2210
gnutls_certificate_free_credentials(mc.cred);
2564
2222
mc.current_server->prev->next = NULL;
2565
2223
while(mc.current_server != NULL){
2566
2224
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2575
2225
free(mc.current_server);
2576
2226
mc.current_server = next;
2577
2227
}
2578
2228
}
2579
2229
2580
/* Re-raise privileges */
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2581
2234
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2609
2239
}
2610
2240
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2615
2257
}
2616
2258
}
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2620
2265
2621
2266
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2267
if(tempdir_created){
2623
2268
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
direntry->d_name);
2278
if(ret < 0){
2279
perror_plus("asprintf");
2280
continue;
2281
}
2282
ret = remove(fullname);
2283
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
2286
}
2287
free(fullname);
2661
2288
}
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
2295
}
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2663
2299
}
2664
2300
}
2665
2301
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0