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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (505.2.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- 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
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
219
return -1;
243
220
}
244
221
/* Special case of first server */
245
if(*current_server == NULL){
222
if (mc.current_server == NULL){
246
223
new_server->next = new_server;
247
224
new_server->prev = new_server;
248
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
249
227
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
253
230
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
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;
257
239
}
258
240
259
241
/*
260
242
* Initialize GPGME.
261
243
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
267
246
gpgme_error_t rc;
268
247
gpgme_engine_info_t engine_info;
269
248
249
270
250
/*
271
251
* Helper function to insert pub and seckey to the engine keyring.
272
252
*/
273
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
274
254
int ret;
275
255
int fd;
276
256
gpgme_data_t pgp_data;
288
268
return false;
289
269
}
290
270
291
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
292
272
if(rc != GPG_ERR_NO_ERROR){
293
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
274
gpgme_strsource(rc), gpgme_strerror(rc));
338
318
}
339
319
340
320
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
342
322
if(rc != GPG_ERR_NO_ERROR){
343
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
357
337
* Decrypt OpenPGP data.
358
338
* Returns -1 on error
359
339
*/
360
__attribute__((nonnull, warn_unused_result))
361
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
341
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
342
char **plaintext){
365
343
gpgme_data_t dh_crypto, dh_plain;
366
344
gpgme_error_t rc;
367
345
ssize_t ret;
393
371
394
372
/* Decrypt data from the cryptotext data buffer to the plaintext
395
373
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
375
if(rc != GPG_ERR_NO_ERROR){
398
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
377
gpgme_strsource(rc), gpgme_strerror(rc));
400
378
plaintext_length = -1;
401
379
if(debug){
402
380
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
404
382
if(result == NULL){
405
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
384
} else {
483
461
return plaintext_length;
484
462
}
485
463
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
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 */
489
467
if(ret == NULL)
490
468
ret = "(unknown)";
491
469
return ret;
492
470
}
493
471
494
472
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
473
static void debuggnutls(__attribute__((unused)) int level,
497
474
const char* string){
498
475
fprintf_plus(stderr, "GnuTLS: %s", string);
499
476
}
500
477
501
__attribute__((nonnull, warn_unused_result))
502
478
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
479
const char *seckeyfilename){
505
480
int ret;
506
481
507
482
if(debug){
524
499
}
525
500
526
501
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
503
if(ret != GNUTLS_E_SUCCESS){
529
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
505
safer_gnutls_strerror(ret));
540
515
}
541
516
542
517
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
544
519
GNUTLS_OPENPGP_FMT_BASE64);
545
520
if(ret != GNUTLS_E_SUCCESS){
546
521
fprintf_plus(stderr,
552
527
}
553
528
554
529
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
556
531
if(ret != GNUTLS_E_SUCCESS){
557
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
533
" initialization: %s\n",
559
534
safer_gnutls_strerror(ret));
560
535
goto globalfail;
561
536
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
538
if(ret != GNUTLS_E_SUCCESS){
564
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
540
safer_gnutls_strerror(ret));
566
541
goto globalfail;
567
542
}
568
543
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
545
571
546
return 0;
572
547
573
548
globalfail:
574
549
575
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
576
551
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
578
553
return -1;
579
554
}
580
555
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
584
557
int ret;
585
558
/* GnuTLS session creation */
586
559
do {
598
571
{
599
572
const char *err;
600
573
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
575
if(quit_now){
603
576
gnutls_deinit(*session);
604
577
return -1;
615
588
616
589
do {
617
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
591
mc.cred);
619
592
if(quit_now){
620
593
gnutls_deinit(*session);
621
594
return -1;
631
604
/* ignore client certificate if any. */
632
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
606
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
608
636
609
return 0;
637
610
}
641
614
__attribute__((unused)) const char *txt){}
642
615
643
616
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
646
618
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
619
int af){
648
620
int ret, tcp_sd = -1;
649
621
ssize_t sret;
650
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
651
626
char *buffer = NULL;
652
627
char *decrypted_buffer = NULL;
653
628
size_t buffer_length = 0;
677
652
return -1;
678
653
}
679
654
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
713
656
if(ret != 0){
714
657
return -1;
715
658
}
716
659
717
660
if(debug){
718
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
720
663
}
721
664
722
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
677
735
678
memset(&to, 0, sizeof(to));
736
679
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
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);
739
682
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
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);
742
685
}
743
686
if(ret < 0 ){
744
687
int e = errno;
753
696
goto mandos_end;
754
697
}
755
698
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((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*/
759
706
if(if_index == AVAHI_IF_UNSPEC){
760
707
fprintf_plus(stderr, "An IPv6 link-local address is"
761
708
" incomplete without a network interface\n");
763
710
goto mandos_end;
764
711
}
765
712
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
767
714
}
768
715
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
770
719
}
771
720
772
721
if(quit_now){
780
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
730
perror_plus("if_indextoname");
782
731
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
785
734
}
786
735
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
789
738
}
790
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
792
742
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
797
745
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
802
748
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
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
}
809
755
}
810
756
}
811
757
815
761
}
816
762
817
763
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
765
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
767
}
824
768
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
770
int e = errno;
827
771
perror_plus("connect");
828
772
errno = e;
874
818
goto mandos_end;
875
819
}
876
820
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(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);
882
823
883
824
if(quit_now){
884
825
errno = EINTR;
989
930
if(buffer_length > 0){
990
931
ssize_t decrypted_buffer_size;
991
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
933
&decrypted_buffer);
993
934
if(decrypted_buffer_size >= 0){
994
935
995
936
written = 0;
1043
984
return retval;
1044
985
}
1045
986
1046
__attribute__((nonnull))
1047
987
static void resolve_callback(AvahiSServiceResolver *r,
1048
988
AvahiIfIndex interface,
1049
989
AvahiProtocol proto,
1057
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
999
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1064
1002
1065
1003
/* Called whenever a service has been resolved successfully or
1066
1004
timed out */
1075
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
1015
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1080
1017
break;
1081
1018
1082
1019
case AVAHI_RESOLVER_FOUND:
1088
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
1026
host_name, ip, (intmax_t)interface, port);
1090
1027
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1095
1030
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1097
1032
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1104
1035
}
1105
1036
}
1106
1037
}
1116
1047
const char *domain,
1117
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1049
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1123
1052
1124
1053
/* Called whenever a new services becomes available on the LAN or
1125
1054
is removed from the LAN */
1133
1062
case AVAHI_BROWSER_FAILURE:
1134
1063
1135
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1139
1067
return;
1140
1068
1141
1069
case AVAHI_BROWSER_NEW:
1144
1072
the callback function is called the Avahi server will free the
1145
1073
resolver for us. */
1146
1074
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
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)
1151
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
1079
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1155
1081
break;
1156
1082
1157
1083
case AVAHI_BROWSER_REMOVE:
1176
1102
signal_received = sig;
1177
1103
int old_errno = errno;
1178
1104
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1181
1107
}
1182
1108
errno = old_errno;
1183
1109
}
1184
1110
1185
__attribute__((nonnull, warn_unused_result))
1186
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1112
int ret;
1188
error_t ret_errno;
1189
1113
1190
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1115
if(s < 0){
1192
ret_errno = errno;
1193
1116
perror_plus("socket");
1194
errno = ret_errno;
1195
1117
return false;
1196
1118
}
1197
1119
strcpy(ifr->ifr_name, ifname);
1198
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1121
if(ret == -1){
1200
1122
if(debug){
1201
ret_errno = errno;
1202
1123
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
1124
}
1205
1125
return false;
1206
1126
}
1207
1127
return true;
1208
1128
}
1209
1129
1210
__attribute__((nonnull, warn_unused_result))
1211
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1131
1213
1132
/* Reject the loopback device */
1255
1174
* corresponds to an acceptable network device.
1256
1175
* (This function is passed to scandir(3) as a filter function.)
1257
1176
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1177
int good_interface(const struct dirent *if_entry){
1260
1178
if(if_entry->d_name[0] == '.'){
1261
1179
return 0;
1277
1195
}
1278
1196
1279
1197
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__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
1314
1240
int notdotentries(const struct dirent *direntry){
1315
1241
/* Skip "." and ".." */
1316
1242
if(direntry->d_name[0] == '.'
1323
1249
}
1324
1250
1325
1251
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1252
int runnable_hook(const struct dirent *direntry){
1328
1253
int ret;
1329
1254
size_t sret;
1337
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1263
"abcdefghijklmnopqrstuvwxyz"
1339
1264
"0123456789"
1340
"_.-");
1265
"_-");
1341
1266
if((direntry->d_name)[sret] != '\0'){
1342
1267
/* Contains non-allowed characters */
1343
1268
if(debug){
1347
1272
return 0;
1348
1273
}
1349
1274
1350
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);
1351
1283
if(ret == -1){
1352
1284
if(debug){
1353
1285
perror_plus("Could not stat hook");
1377
1309
return 1;
1378
1310
}
1379
1311
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1313
int ret;
1384
1314
struct timespec now;
1385
1315
struct timespec waited_time;
1386
1316
intmax_t block_time;
1387
1317
1388
1318
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1391
1321
fprintf_plus(stderr, "Wait until first server is found."
1392
1322
" No timeout!\n");
1393
1323
}
1394
1324
ret = avahi_simple_poll_iterate(s, -1);
1395
1325
} else {
1396
if(debug){
1326
if (debug){
1397
1327
fprintf_plus(stderr, "Check current_server if we should run"
1398
1328
" it, or wait\n");
1399
1329
}
1406
1336
/* Calculating in ms how long time between now and server
1407
1337
who we visted longest time ago. Now - last seen. */
1408
1338
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1410
1340
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1412
1342
/* total time is 10s/10,000ms.
1413
1343
Converting to s from ms by dividing by 1,000,
1414
1344
and ns to ms by dividing by 1,000,000. */
1416
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1348
1419
if(debug){
1349
if (debug){
1420
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
1351
block_time);
1422
1352
}
1423
1353
1424
1354
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
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);
1429
1359
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1431
1361
return 0;
1432
1362
}
1433
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1435
1365
if(ret == -1){
1436
1366
perror_plus("clock_gettime");
1437
1367
return -1;
1438
1368
}
1439
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1440
1370
block_time = 0; /* Call avahi to find new Mandos
1441
1371
servers, but don't block */
1442
1372
}
1444
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1375
}
1446
1376
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1448
1378
return (ret != 1) ? ret : 0;
1449
1379
}
1450
1380
}
1451
1381
}
1452
1382
}
1453
1383
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
#ifndef O_CLOEXEC
1511
/*
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
*/
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1520
if(ret < 0){
1521
return ret;
1522
}
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1525
ret | FD_CLOEXEC));
1526
}
1527
#endif /* not O_CLOEXEC */
1528
1529
__attribute__((nonnull))
1530
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1531
1385
const float delay){
1532
1386
struct dirent **direntries;
1533
if(hookdir_fd == -1){
1534
hookdir_fd = open(hookdir, O_RDONLY |
1535
#ifdef O_CLOEXEC
1536
O_CLOEXEC
1537
#else /* not O_CLOEXEC */
1538
0
1539
#endif /* not O_CLOEXEC */
1540
);
1541
if(hookdir_fd == -1){
1542
if(errno == ENOENT){
1543
if(debug){
1544
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1545
" found\n", hookdir);
1546
}
1547
} else {
1548
perror_plus("open");
1549
}
1550
return;
1551
}
1552
#ifndef O_CLOEXEC
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1557
} else {
1558
hookdir_fd = -1;
1559
}
1560
return;
1561
}
1562
#endif /* not O_CLOEXEC */
1563
}
1564
#ifdef __GLIBC__
1565
#if __GLIBC_PREREQ(2, 15)
1566
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1567
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
alphasort);
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
alphasort);
1575
#endif /* not __GLIBC__ */
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1576
1391
if(numhooks == -1){
1577
1392
perror_plus("scandir");
1578
return;
1579
}
1580
struct dirent *direntry;
1581
int ret;
1582
int devnull = open("/dev/null", O_RDONLY);
1583
for(int i = 0; i < numhooks; i++){
1584
direntry = direntries[i];
1585
if(debug){
1586
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1587
direntry->d_name);
1588
}
1589
pid_t hook_pid = fork();
1590
if(hook_pid == 0){
1591
/* Child */
1592
/* Raise privileges */
1593
if(raise_privileges_permanently() != 0){
1594
perror_plus("Failed to raise privileges");
1595
_exit(EX_NOPERM);
1596
}
1597
/* Set group */
1598
errno = 0;
1599
ret = setgid(0);
1600
if(ret == -1){
1601
perror_plus("setgid");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Reset supplementary groups */
1605
errno = 0;
1606
ret = setgroups(0, NULL);
1607
if(ret == -1){
1608
perror_plus("setgroups");
1609
_exit(EX_NOPERM);
1610
}
1611
ret = dup2(devnull, STDIN_FILENO);
1612
if(ret == -1){
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1614
_exit(EX_OSERR);
1615
}
1616
ret = close(devnull);
1617
if(ret == -1){
1618
perror_plus("close");
1619
_exit(EX_OSERR);
1620
}
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
if(ret == -1){
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1624
_exit(EX_OSERR);
1625
}
1626
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
if(ret == -1){
1628
perror_plus("setenv");
1629
_exit(EX_OSERR);
1630
}
1631
ret = setenv("DEVICE", interface, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1637
if(ret == -1){
1638
perror_plus("setenv");
1639
_exit(EX_OSERR);
1640
}
1641
ret = setenv("MODE", mode, 1);
1642
if(ret == -1){
1643
perror_plus("setenv");
1644
_exit(EX_OSERR);
1645
}
1646
char *delaystring;
1647
ret = asprintf(&delaystring, "%f", (double)delay);
1648
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){
1649
1400
perror_plus("asprintf");
1650
_exit(EX_OSERR);
1651
}
1652
ret = setenv("DELAY", delaystring, 1);
1653
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
}
1654
1471
free(delaystring);
1655
perror_plus("setenv");
1656
_exit(EX_OSERR);
1657
}
1658
free(delaystring);
1659
if(connect_to != NULL){
1660
ret = setenv("CONNECT", connect_to, 1);
1661
if(ret == -1){
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
}
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
1668
perror_plus("fexecve");
1669
_exit(EXIT_FAILURE);
1670
}
1671
} else {
1672
int status;
1673
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1674
perror_plus("waitpid");
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
continue;
1683
}
1684
} else if(WIFSIGNALED(status)){
1685
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1686
" signal %d\n", direntry->d_name,
1687
WTERMSIG(status));
1688
continue;
1689
} else {
1690
fprintf_plus(stderr, "Warning: network hook \"%s\""
1691
" crashed\n", direntry->d_name);
1692
continue;
1693
}
1694
}
1695
if(debug){
1696
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1697
direntry->d_name);
1698
}
1699
}
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1701
perror_plus("close");
1702
} else {
1703
hookdir_fd = -1;
1704
}
1705
close(devnull);
1706
}
1707
1708
__attribute__((nonnull, warn_unused_result))
1709
error_t bring_up_interface(const char *const interface,
1710
const float delay){
1711
error_t old_errno = errno;
1712
int ret;
1713
struct ifreq network;
1714
unsigned int if_index = if_nametoindex(interface);
1715
if(if_index == 0){
1716
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1717
errno = old_errno;
1718
return ENXIO;
1719
}
1720
1721
if(quit_now){
1722
errno = old_errno;
1723
return EINTR;
1724
}
1725
1726
if(not interface_is_up(interface)){
1727
error_t ret_errno = 0, ioctl_errno = 0;
1728
if(not get_flags(interface, &network)){
1729
ret_errno = errno;
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
errno = old_errno;
1733
return ret_errno;
1734
}
1735
network.ifr_flags |= IFF_UP; /* set flag */
1736
1737
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1738
if(sd == -1){
1739
ret_errno = errno;
1740
perror_plus("socket");
1741
errno = old_errno;
1742
return ret_errno;
1743
}
1744
1745
if(quit_now){
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
if(ret == -1){
1748
perror_plus("close");
1749
}
1750
errno = old_errno;
1751
return EINTR;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise privileges */
1760
ret_errno = raise_privileges();
1761
if(ret_errno != 0){
1762
perror_plus("Failed to raise privileges");
1763
}
1764
1765
#ifdef __linux__
1766
int ret_linux;
1767
bool restore_loglevel = false;
1768
if(ret_errno == 0){
1769
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1770
messages about the network interface to mess up the prompt */
1771
ret_linux = klogctl(8, NULL, 5);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
} else {
1775
restore_loglevel = true;
1776
}
1777
}
1778
#endif /* __linux__ */
1779
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1780
ioctl_errno = errno;
1781
#ifdef __linux__
1782
if(restore_loglevel){
1783
ret_linux = klogctl(7, NULL, 0);
1784
if(ret_linux == -1){
1785
perror_plus("klogctl");
1786
}
1787
}
1788
#endif /* __linux__ */
1789
1790
/* If raise_privileges() succeeded above */
1791
if(ret_errno == 0){
1792
/* Lower privileges */
1793
ret_errno = lower_privileges();
1794
if(ret_errno != 0){
1795
errno = ret_errno;
1796
perror_plus("Failed to lower privileges");
1797
}
1798
}
1799
1800
/* Close the socket */
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1802
if(ret == -1){
1803
perror_plus("close");
1804
}
1805
1806
if(ret_setflags == -1){
1807
errno = ioctl_errno;
1808
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1809
errno = old_errno;
1810
return ioctl_errno;
1811
}
1812
} else if(debug){
1813
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1814
interface);
1815
}
1816
1817
/* Sleep checking until interface is running.
1818
Check every 0.25s, up to total time of delay */
1819
for(int i=0; i < delay * 4; i++){
1820
if(interface_is_running(interface)){
1821
break;
1822
}
1823
struct timespec sleeptime = { .tv_nsec = 250000000 };
1824
ret = nanosleep(&sleeptime, NULL);
1825
if(ret == -1 and errno != EINTR){
1826
perror_plus("nanosleep");
1827
}
1828
}
1829
1830
errno = old_errno;
1831
return 0;
1832
}
1833
1834
__attribute__((nonnull, warn_unused_result))
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
1837
struct ifreq network;
1838
unsigned int if_index = if_nametoindex(interface);
1839
if(if_index == 0){
1840
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1841
errno = old_errno;
1842
return ENXIO;
1843
}
1844
if(interface_is_up(interface)){
1845
error_t ret_errno = 0, ioctl_errno = 0;
1846
if(not get_flags(interface, &network) and debug){
1847
ret_errno = errno;
1848
fprintf_plus(stderr, "Failed to get flags for interface "
1849
"\"%s\"\n", interface);
1850
errno = old_errno;
1851
return ret_errno;
1852
}
1853
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1854
1855
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1856
if(sd == -1){
1857
ret_errno = errno;
1858
perror_plus("socket");
1859
errno = old_errno;
1860
return ret_errno;
1861
}
1862
1863
if(debug){
1864
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1865
interface);
1866
}
1867
1868
/* Raise privileges */
1869
ret_errno = raise_privileges();
1870
if(ret_errno != 0){
1871
perror_plus("Failed to raise privileges");
1872
}
1873
1874
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1875
ioctl_errno = errno;
1876
1877
/* If raise_privileges() succeeded above */
1878
if(ret_errno == 0){
1879
/* Lower privileges */
1880
ret_errno = lower_privileges();
1881
if(ret_errno != 0){
1882
errno = ret_errno;
1883
perror_plus("Failed to lower privileges");
1884
}
1885
}
1886
1887
/* Close the socket */
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1889
if(ret == -1){
1890
perror_plus("close");
1891
}
1892
1893
if(ret_setflags == -1){
1894
errno = ioctl_errno;
1895
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1896
errno = old_errno;
1897
return ioctl_errno;
1898
}
1899
} else if(debug){
1900
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1901
interface);
1902
}
1903
1904
errno = old_errno;
1905
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;
1906
1511
}
1907
1512
1908
1513
int main(int argc, char *argv[]){
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
1913
1514
AvahiSServiceBrowser *sb = NULL;
1914
error_t ret_errno;
1515
int error;
1915
1516
int ret;
1916
1517
intmax_t tmpmax;
1917
1518
char *tmp;
1918
1519
int exitcode = EXIT_SUCCESS;
1919
char *interfaces_to_take_down = NULL;
1920
size_t interfaces_to_take_down_size = 0;
1921
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1922
char old_tempdir[] = "/tmp/mandosXXXXXX";
1923
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;
1924
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1925
1529
const char *seckey = PATHDIR "/" SECKEY;
1926
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1927
char *interfaces_hooks = NULL;
1928
1531
1929
1532
bool gnutls_initialized = false;
1930
1533
bool gpgme_initialized = false;
1992
1595
.group = 2 },
1993
1596
{ .name = "retry", .key = 132,
1994
1597
.arg = "SECONDS",
1995
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
1996
1599
.group = 2 },
1997
1600
{ .name = "network-hook-dir", .key = 133,
1998
1601
.arg = "DIR",
2021
1624
connect_to = arg;
2022
1625
break;
2023
1626
case 'i': /* --interface */
2024
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2025
arg, (int)',');
2026
if(ret_errno != 0){
2027
argp_error(state, "%s", strerror(ret_errno));
2028
}
1627
interface = arg;
2029
1628
break;
2030
1629
case 's': /* --seckey */
2031
1630
seckey = arg;
2074
1673
argp_state_help(state, state->out_stream,
2075
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2076
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
2077
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2078
1679
exit(argp_err_exit_status);
2079
1680
break;
2108
1709
/* Work around Debian bug #633582:
2109
1710
<http://bugs.debian.org/633582> */
2110
1711
2111
/* Re-raise privileges */
2112
ret_errno = raise_privileges();
2113
if(ret_errno != 0){
2114
errno = ret_errno;
2115
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");
2116
1717
} else {
2117
1718
struct stat st;
2118
1719
2159
1760
}
2160
1761
2161
1762
/* Lower privileges */
2162
ret_errno = lower_privileges();
2163
if(ret_errno != 0){
2164
errno = ret_errno;
2165
perror_plus("Failed to lower privileges");
2166
}
2167
}
2168
}
2169
2170
/* Remove invalid interface names (except "none") */
2171
{
2172
char *interface = NULL;
2173
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
interface))){
2175
if(strcmp(interface, "none") != 0
2176
and if_nametoindex(interface) == 0){
2177
if(interface[0] != '\0'){
2178
fprintf_plus(stderr, "Not using nonexisting interface"
2179
" \"%s\"\n", interface);
2180
}
2181
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2182
interface = NULL;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2183
1767
}
2184
1768
}
2185
1769
}
2186
1770
2187
1771
/* Run network hooks */
2188
{
2189
if(mc.interfaces != NULL){
2190
interfaces_hooks = malloc(mc.interfaces_size);
2191
if(interfaces_hooks == NULL){
2192
perror_plus("malloc");
2193
goto end;
2194
}
2195
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2196
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2197
}
2198
run_network_hooks("start", interfaces_hooks != NULL ?
2199
interfaces_hooks : "", delay);
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2200
1774
}
2201
1775
2202
1776
if(not debug){
2203
1777
avahi_set_log_function(empty_log);
2204
1778
}
2205
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
2206
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2207
1813
from the signal handler */
2208
1814
/* Initialize the pseudo-RNG for Avahi */
2209
1815
srand((unsigned int) time(NULL));
2210
simple_poll = avahi_simple_poll_new();
2211
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2212
1818
fprintf_plus(stderr,
2213
1819
"Avahi: Failed to create simple poll object.\n");
2214
1820
exitcode = EX_UNAVAILABLE;
2278
1884
}
2279
1885
}
2280
1886
2281
/* If no interfaces were specified, make a list */
2282
if(mc.interfaces == NULL){
2283
struct dirent **direntries;
2284
/* Look for any good interfaces */
2285
ret = scandir(sys_class_net, &direntries, good_interface,
2286
alphasort);
2287
if(ret >= 1){
2288
/* Add all found interfaces to interfaces list */
2289
for(int i = 0; i < ret; ++i){
2290
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2291
direntries[i]->d_name);
2292
if(ret_errno != 0){
2293
errno = ret_errno;
2294
perror_plus("argz_add");
2295
continue;
2296
}
2297
if(debug){
2298
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2299
direntries[i]->d_name);
2300
}
2301
}
2302
free(direntries);
2303
} else {
2304
free(direntries);
2305
fprintf_plus(stderr, "Could not find a network interface\n");
2306
exitcode = EXIT_FAILURE;
2307
goto end;
2308
}
2309
}
2310
2311
/* Bring up interfaces which are down, and remove any "none"s */
2312
{
2313
char *interface = NULL;
2314
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2315
interface))){
2316
/* If interface name is "none", stop bringing up interfaces.
2317
Also remove all instances of "none" from the list */
2318
if(strcmp(interface, "none") == 0){
2319
argz_delete(&mc.interfaces, &mc.interfaces_size,
2320
interface);
2321
interface = NULL;
2322
while((interface = argz_next(mc.interfaces,
2323
mc.interfaces_size, interface))){
2324
if(strcmp(interface, "none") == 0){
2325
argz_delete(&mc.interfaces, &mc.interfaces_size,
2326
interface);
2327
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");
2328
1972
}
2329
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){
2330
1991
break;
2331
1992
}
2332
bool interface_was_up = interface_is_up(interface);
2333
errno = bring_up_interface(interface, delay);
2334
if(not interface_was_up){
2335
if(errno != 0){
2336
perror_plus("Failed to bring up interface");
2337
} else {
2338
errno = argz_add(&interfaces_to_take_down,
2339
&interfaces_to_take_down_size,
2340
interface);
2341
if(errno != 0){
2342
perror_plus("argz_add");
2343
}
2344
}
2345
}
2346
}
2347
if(debug and (interfaces_to_take_down == NULL)){
2348
fprintf_plus(stderr, "No interfaces were brought up\n");
2349
}
2350
}
2351
2352
/* If we only got one interface, explicitly use only that one */
2353
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2354
if(debug){
2355
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2356
mc.interfaces);
2357
}
2358
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
}
2359
2022
}
2360
2023
2361
2024
if(quit_now){
2362
2025
goto end;
2363
2026
}
2364
2027
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2366
2029
if(ret == -1){
2367
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2368
2031
exitcode = EX_UNAVAILABLE;
2375
2038
goto end;
2376
2039
}
2377
2040
2378
/* Try /run/tmp before /tmp */
2379
tempdir = mkdtemp(run_tempdir);
2380
if(tempdir == NULL and errno == ENOENT){
2381
if(debug){
2382
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2383
run_tempdir, old_tempdir);
2384
}
2385
tempdir = mkdtemp(old_tempdir);
2386
}
2387
if(tempdir == NULL){
2041
if(mkdtemp(tempdir) == NULL){
2388
2042
perror_plus("mkdtemp");
2389
2043
goto end;
2390
2044
}
2045
tempdir_created = true;
2391
2046
2392
2047
if(quit_now){
2393
2048
goto end;
2394
2049
}
2395
2050
2396
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2397
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2398
2053
exitcode = EX_UNAVAILABLE;
2399
2054
goto end;
2409
2064
/* Connect directly, do not use Zeroconf */
2410
2065
/* (Mainly meant for debugging) */
2411
2066
char *address = strrchr(connect_to, ':');
2412
2413
2067
if(address == NULL){
2414
2068
fprintf_plus(stderr, "No colon in address\n");
2415
2069
exitcode = EX_USAGE;
2420
2074
goto end;
2421
2075
}
2422
2076
2423
in_port_t port;
2077
uint16_t port;
2424
2078
errno = 0;
2425
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2426
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2427
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2428
2082
fprintf_plus(stderr, "Bad port number\n");
2429
2083
exitcode = EX_USAGE;
2430
2084
goto end;
2431
2085
}
2432
2086
2433
2087
if(quit_now){
2434
2088
goto end;
2435
2089
}
2436
2090
2437
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2438
2092
*address = '\0';
2439
2093
/* Colon in address indicates IPv6 */
2440
2094
int af;
2456
2110
}
2457
2111
2458
2112
while(not quit_now){
2459
ret = start_mandos_communication(address, port, if_index, af,
2460
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2461
2114
if(quit_now or ret == 0){
2462
2115
break;
2463
2116
}
2465
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2466
2119
(int)retry_interval);
2467
2120
}
2468
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2469
2122
}
2470
2123
2471
if(not quit_now){
2124
if (not quit_now){
2472
2125
exitcode = EXIT_SUCCESS;
2473
2126
}
2474
2127
2489
2142
config.publish_domain = 0;
2490
2143
2491
2144
/* Allocate a new server */
2492
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2493
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2494
2148
2495
2149
/* Free the Avahi configuration data */
2496
2150
avahi_server_config_free(&config);
2499
2153
/* Check if creating the Avahi server object succeeded */
2500
2154
if(mc.server == NULL){
2501
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2502
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2503
2157
exitcode = EX_UNAVAILABLE;
2504
2158
goto end;
2505
2159
}
2511
2165
/* Create the Avahi service browser */
2512
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2513
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2514
NULL, 0, browse_callback,
2515
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2516
2169
if(sb == NULL){
2517
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2518
2171
avahi_strerror(avahi_server_errno(mc.server)));
2529
2182
if(debug){
2530
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2531
2184
}
2532
2533
ret = avahi_loop_with_timeout(simple_poll,
2534
(int)(retry_interval * 1000), &mc);
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2535
2188
if(debug){
2536
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2537
2190
(ret == 0) ? "successfully" : "with error");
2544
2197
}
2545
2198
2546
2199
/* Cleanup things */
2547
free(mc.interfaces);
2548
2549
2200
if(sb != NULL)
2550
2201
avahi_s_service_browser_free(sb);
2551
2202
2552
2203
if(mc.server != NULL)
2553
2204
avahi_server_free(mc.server);
2554
2205
2555
if(simple_poll != NULL)
2556
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2557
2208
2558
2209
if(gnutls_initialized){
2559
2210
gnutls_certificate_free_credentials(mc.cred);
2576
2227
}
2577
2228
}
2578
2229
2579
/* Re-raise privileges */
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2580
2234
{
2581
ret_errno = raise_privileges();
2582
if(ret_errno != 0){
2583
perror_plus("Failed to raise privileges");
2584
} else {
2585
2586
/* Run network hooks */
2587
run_network_hooks("stop", interfaces_hooks != NULL ?
2588
interfaces_hooks : "", delay);
2589
2590
/* Take down the network interfaces which were brought up */
2591
{
2592
char *interface = NULL;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2595
interface))){
2596
ret_errno = take_down_interface(interface);
2597
if(ret_errno != 0){
2598
errno = ret_errno;
2599
perror_plus("Failed to take down interface");
2600
}
2601
}
2602
if(debug and (interfaces_to_take_down == NULL)){
2603
fprintf_plus(stderr, "No interfaces needed to be taken"
2604
" down\n");
2605
}
2606
}
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2607
2239
}
2608
2240
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
2611
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
}
2612
2257
}
2613
2258
}
2614
2615
free(interfaces_to_take_down);
2616
free(interfaces_hooks);
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2617
2265
2618
2266
/* Removes the GPGME temp directory and all files inside */
2619
if(tempdir != NULL){
2267
if(tempdir_created){
2620
2268
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
int numentries = scandir(tempdir, &direntries, notdotentries,
2626
alphasort);
2627
if(numentries > 0){
2628
for(int i = 0; i < numentries; i++){
2629
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2630
if(ret == -1){
2631
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2632
" \"%s\", 0): %s\n", tempdir,
2633
direntries[i]->d_name, strerror(errno));
2634
}
2635
}
2636
2637
/* need to clean even if 0 because man page doesn't specify */
2638
free(direntries);
2639
if(numentries == -1){
2640
perror_plus("scandir");
2641
}
2642
ret = rmdir(tempdir);
2643
if(ret == -1 and errno != ENOENT){
2644
perror_plus("rmdir");
2645
}
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);
2646
2288
}
2647
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");
2648
2299
}
2649
2300
}
2650
2301
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0