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- Committer: Teddy Hogeborn
- Date: 2014-06-15 01:01:14 UTC
- Revision ID: teddy@recompile.se-20140615010114-fzz32p5naoo8nket
mandos-client: Better error messages.
* Makefile (run-client): Update message to match current messages.
Also set GNOME_KEYRING_CONTROL to empty
string to block pam_gnome_keyring.
* plugins.d/mandos-client (raise_privileges): Do not print errors.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(run_network_hooks): Print errors from above functions correctly.
(bring_up_interface, take_down_interface, main): - '' -
* Makefile (run-client): Update message to match current messages.
Also set GNOME_KEYRING_CONTROL to empty
string to block pam_gnome_keyring.
* plugins.d/mandos-client (raise_privileges): Do not print errors.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(run_network_hooks): Print errors from above functions correctly.
(bring_up_interface, take_down_interface, main): - '' -
- files added:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
177
185
perror(print_text);
178
186
}
179
187
180
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
189
int fprintf_plus(FILE *stream, const char *format, ...){
182
190
va_list ap;
183
191
va_start (ap, format);
184
192
185
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
194
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
196
}
189
197
190
198
/*
192
200
* bytes. "buffer_capacity" is how much is currently allocated,
193
201
* "buffer_length" is how much is already used.
194
202
*/
203
__attribute__((nonnull, warn_unused_result))
195
204
size_t incbuffer(char **buffer, size_t buffer_length,
196
205
size_t buffer_capacity){
197
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
200
213
return 0;
201
214
}
215
*buffer = new_buf;
202
216
buffer_capacity += BUFFER_SIZE;
203
217
}
204
218
return buffer_capacity;
205
219
}
206
220
207
221
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
210
225
int ret;
211
226
server *new_server = malloc(sizeof(server));
212
227
if(new_server == NULL){
221
236
perror_plus("strdup");
222
237
return false;
223
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
224
244
/* Special case of first server */
225
if (mc.current_server == NULL){
245
if(*current_server == NULL){
226
246
new_server->next = new_server;
227
247
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
248
*current_server = new_server;
230
249
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
233
253
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
254
(*current_server)->prev = new_server;
240
255
}
241
256
return true;
242
257
}
244
259
/*
245
260
* Initialize GPGME.
246
261
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
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){
249
267
gpgme_error_t rc;
250
268
gpgme_engine_info_t engine_info;
251
269
252
253
270
/*
254
271
* Helper function to insert pub and seckey to the engine keyring.
255
272
*/
256
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
257
274
int ret;
258
275
int fd;
259
276
gpgme_data_t pgp_data;
271
288
return false;
272
289
}
273
290
274
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
275
292
if(rc != GPG_ERR_NO_ERROR){
276
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
294
gpgme_strsource(rc), gpgme_strerror(rc));
321
338
}
322
339
323
340
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
325
342
if(rc != GPG_ERR_NO_ERROR){
326
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
357
* Decrypt OpenPGP data.
341
358
* Returns -1 on error
342
359
*/
360
__attribute__((nonnull, warn_unused_result))
343
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
362
size_t crypto_size,
345
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
346
365
gpgme_data_t dh_crypto, dh_plain;
347
366
gpgme_error_t rc;
348
367
ssize_t ret;
374
393
375
394
/* Decrypt data from the cryptotext data buffer to the plaintext
376
395
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
397
if(rc != GPG_ERR_NO_ERROR){
379
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
399
gpgme_strsource(rc), gpgme_strerror(rc));
381
400
plaintext_length = -1;
382
401
if(debug){
383
402
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
385
404
if(result == NULL){
386
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
406
} else {
464
483
return plaintext_length;
465
484
}
466
485
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
470
489
if(ret == NULL)
471
490
ret = "(unknown)";
472
491
return ret;
473
492
}
474
493
475
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
476
496
static void debuggnutls(__attribute__((unused)) int level,
477
497
const char* string){
478
498
fprintf_plus(stderr, "GnuTLS: %s", string);
479
499
}
480
500
501
__attribute__((nonnull, warn_unused_result))
481
502
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
483
505
int ret;
484
506
485
507
if(debug){
502
524
}
503
525
504
526
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
528
if(ret != GNUTLS_E_SUCCESS){
507
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
530
safer_gnutls_strerror(ret));
518
540
}
519
541
520
542
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
522
544
GNUTLS_OPENPGP_FMT_BASE64);
523
545
if(ret != GNUTLS_E_SUCCESS){
524
546
fprintf_plus(stderr,
530
552
}
531
553
532
554
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
534
556
if(ret != GNUTLS_E_SUCCESS){
535
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
558
" initialization: %s\n",
537
559
safer_gnutls_strerror(ret));
538
560
goto globalfail;
539
561
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
563
if(ret != GNUTLS_E_SUCCESS){
542
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
565
safer_gnutls_strerror(ret));
544
566
goto globalfail;
545
567
}
546
568
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
570
549
571
return 0;
550
572
551
573
globalfail:
552
574
553
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
554
576
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
556
578
return -1;
557
579
}
558
580
559
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
560
584
int ret;
561
585
/* GnuTLS session creation */
562
586
do {
574
598
{
575
599
const char *err;
576
600
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
602
if(quit_now){
579
603
gnutls_deinit(*session);
580
604
return -1;
591
615
592
616
do {
593
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
618
mc->cred);
595
619
if(quit_now){
596
620
gnutls_deinit(*session);
597
621
return -1;
607
631
/* ignore client certificate if any. */
608
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
633
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
635
612
636
return 0;
613
637
}
617
641
__attribute__((unused)) const char *txt){}
618
642
619
643
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
621
646
AvahiIfIndex if_index,
622
int af){
647
int af, mandos_context *mc){
623
648
int ret, tcp_sd = -1;
624
649
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
650
struct sockaddr_storage to;
629
651
char *buffer = NULL;
630
652
char *decrypted_buffer = NULL;
631
653
size_t buffer_length = 0;
655
677
return -1;
656
678
}
657
679
658
ret = init_gnutls_session(&session);
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);
659
713
if(ret != 0){
660
714
return -1;
661
715
}
662
716
663
717
if(debug){
664
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
719
PRIuMAX "\n", ip, (uintmax_t)port);
666
720
}
667
721
668
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
734
681
735
memset(&to, 0, sizeof(to));
682
736
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
739
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
742
}
689
743
if(ret < 0 ){
690
744
int e = errno;
699
753
goto mandos_end;
700
754
}
701
755
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
759
if(if_index == AVAHI_IF_UNSPEC){
710
760
fprintf_plus(stderr, "An IPv6 link-local address is"
711
761
" incomplete without a network interface\n");
713
763
goto mandos_end;
714
764
}
715
765
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
767
}
718
768
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
770
}
723
771
724
772
if(quit_now){
732
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
781
perror_plus("if_indextoname");
734
782
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
737
785
}
738
786
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
741
789
}
742
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
792
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
748
797
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
751
802
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
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);
758
809
}
759
810
}
760
811
764
815
}
765
816
766
817
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
768
820
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
770
823
}
771
824
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
826
int e = errno;
774
827
perror_plus("connect");
775
828
errno = e;
821
874
goto mandos_end;
822
875
}
823
876
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
826
882
827
883
if(quit_now){
828
884
errno = EINTR;
933
989
if(buffer_length > 0){
934
990
ssize_t decrypted_buffer_size;
935
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
992
&decrypted_buffer, mc);
937
993
if(decrypted_buffer_size >= 0){
938
994
939
995
written = 0;
987
1043
return retval;
988
1044
}
989
1045
1046
__attribute__((nonnull))
990
1047
static void resolve_callback(AvahiSServiceResolver *r,
991
1048
AvahiIfIndex interface,
992
1049
AvahiProtocol proto,
1000
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1059
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1005
1064
1006
1065
/* Called whenever a service has been resolved successfully or
1007
1066
timed out */
1016
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1077
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1020
1080
break;
1021
1081
1022
1082
case AVAHI_RESOLVER_FOUND:
1028
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1089
host_name, ip, (intmax_t)interface, port);
1030
1090
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1033
1095
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1035
1097
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1038
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1102
" list\n", name);
1040
1103
}
1053
1116
const char *domain,
1054
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1118
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1058
1123
1059
1124
/* Called whenever a new services becomes available on the LAN or
1060
1125
is removed from the LAN */
1068
1133
case AVAHI_BROWSER_FAILURE:
1069
1134
1070
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1073
1139
return;
1074
1140
1075
1141
case AVAHI_BROWSER_NEW:
1078
1144
the callback function is called the Avahi server will free the
1079
1145
resolver for us. */
1080
1146
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
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)
1084
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1152
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1087
1155
break;
1088
1156
1089
1157
case AVAHI_BROWSER_REMOVE:
1108
1176
signal_received = sig;
1109
1177
int old_errno = errno;
1110
1178
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1113
1181
}
1114
1182
errno = old_errno;
1115
1183
}
1116
1184
1185
__attribute__((nonnull, warn_unused_result))
1117
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1187
int ret;
1188
error_t ret_errno;
1119
1189
1120
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1191
if(s < 0){
1192
ret_errno = errno;
1122
1193
perror_plus("socket");
1194
errno = ret_errno;
1123
1195
return false;
1124
1196
}
1125
1197
strcpy(ifr->ifr_name, ifname);
1126
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1199
if(ret == -1){
1128
1200
if(debug){
1201
ret_errno = errno;
1129
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1130
1204
}
1131
1205
return false;
1132
1206
}
1133
1207
return true;
1134
1208
}
1135
1209
1210
__attribute__((nonnull, warn_unused_result))
1136
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1212
1138
1213
/* Reject the loopback device */
1180
1255
* corresponds to an acceptable network device.
1181
1256
* (This function is passed to scandir(3) as a filter function.)
1182
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1183
1259
int good_interface(const struct dirent *if_entry){
1184
1260
if(if_entry->d_name[0] == '.'){
1185
1261
return 0;
1201
1277
}
1202
1278
1203
1279
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
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))
1246
1314
int notdotentries(const struct dirent *direntry){
1247
1315
/* Skip "." and ".." */
1248
1316
if(direntry->d_name[0] == '.'
1255
1323
}
1256
1324
1257
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1258
1327
int runnable_hook(const struct dirent *direntry){
1259
1328
int ret;
1260
1329
size_t sret;
1268
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
1338
"abcdefghijklmnopqrstuvwxyz"
1270
1339
"0123456789"
1271
"_-");
1340
"_.-");
1272
1341
if((direntry->d_name)[sret] != '\0'){
1273
1342
/* Contains non-allowed characters */
1274
1343
if(debug){
1278
1347
return 0;
1279
1348
}
1280
1349
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1289
1351
if(ret == -1){
1290
1352
if(debug){
1291
1353
perror_plus("Could not stat hook");
1315
1377
return 1;
1316
1378
}
1317
1379
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1319
1383
int ret;
1320
1384
struct timespec now;
1321
1385
struct timespec waited_time;
1322
1386
intmax_t block_time;
1323
1387
1324
1388
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1389
if(mc->current_server == NULL){
1390
if(debug){
1327
1391
fprintf_plus(stderr, "Wait until first server is found."
1328
1392
" No timeout!\n");
1329
1393
}
1330
1394
ret = avahi_simple_poll_iterate(s, -1);
1331
1395
} else {
1332
if (debug){
1396
if(debug){
1333
1397
fprintf_plus(stderr, "Check current_server if we should run"
1334
1398
" it, or wait\n");
1335
1399
}
1342
1406
/* Calculating in ms how long time between now and server
1343
1407
who we visted longest time ago. Now - last seen. */
1344
1408
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1346
1410
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1348
1412
/* total time is 10s/10,000ms.
1349
1413
Converting to s from ms by dividing by 1,000,
1350
1414
and ns to ms by dividing by 1,000,000. */
1352
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1418
1355
if (debug){
1419
if(debug){
1356
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1421
block_time);
1358
1422
}
1359
1423
1360
1424
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
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);
1365
1429
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1367
1431
return 0;
1368
1432
}
1369
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1371
1435
if(ret == -1){
1372
1436
perror_plus("clock_gettime");
1373
1437
return -1;
1374
1438
}
1375
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1376
1440
block_time = 0; /* Call avahi to find new Mandos
1377
1441
servers, but don't block */
1378
1442
}
1380
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1445
}
1382
1446
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1384
1448
return (ret != 1) ? ret : 0;
1385
1449
}
1386
1450
}
1387
1451
}
1388
1452
}
1389
1453
1390
bool run_network_hooks(const char *mode, const char *interface,
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
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1391
1508
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1397
1536
if(numhooks == -1){
1398
1537
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1406
1610
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1475
1615
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1524
1879
}
1525
1880
1526
1881
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1527
1886
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1887
error_t ret_errno;
1529
1888
int ret;
1530
1889
intmax_t tmpmax;
1531
1890
char *tmp;
1532
1891
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1541
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1898
const char *seckey = PATHDIR "/" SECKEY;
1543
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1544
1901
1545
1902
bool gnutls_initialized = false;
1546
1903
bool gpgme_initialized = false;
1637
1994
connect_to = arg;
1638
1995
break;
1639
1996
case 'i': /* --interface */
1640
interface = arg;
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1641
2002
break;
1642
2003
case 's': /* --seckey */
1643
2004
seckey = arg;
1720
2081
/* Work around Debian bug #633582:
1721
2082
<http://bugs.debian.org/633582> */
1722
2083
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
1728
2089
} else {
1729
2090
struct stat st;
1730
2091
1771
2132
}
1772
2133
1773
2134
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
1778
2156
}
1779
2157
}
1780
2158
}
1781
2159
1782
2160
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
1785
2173
}
1786
2174
1787
2175
if(not debug){
1788
2176
avahi_set_log_function(empty_log);
1789
2177
}
1790
2178
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2180
from the signal handler */
1825
2181
/* Initialize the pseudo-RNG for Avahi */
1826
2182
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
1829
2185
fprintf_plus(stderr,
1830
2186
"Avahi: Failed to create simple poll object.\n");
1831
2187
exitcode = EX_UNAVAILABLE;
1895
2251
}
1896
2252
}
1897
2253
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
1983
2303
}
1984
2304
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2305
break;
2003
2306
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2334
}
2034
2335
2035
2336
if(quit_now){
2036
2337
goto end;
2037
2338
}
2038
2339
2039
ret = init_gnutls_global(pubkey, seckey);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2341
if(ret == -1){
2041
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2343
exitcode = EX_UNAVAILABLE;
2049
2350
goto end;
2050
2351
}
2051
2352
2052
if(mkdtemp(tempdir) == NULL){
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2053
2363
perror_plus("mkdtemp");
2054
2364
goto end;
2055
2365
}
2056
tempdir_created = true;
2057
2366
2058
2367
if(quit_now){
2059
2368
goto end;
2060
2369
}
2061
2370
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2373
exitcode = EX_UNAVAILABLE;
2065
2374
goto end;
2075
2384
/* Connect directly, do not use Zeroconf */
2076
2385
/* (Mainly meant for debugging) */
2077
2386
char *address = strrchr(connect_to, ':');
2387
2078
2388
if(address == NULL){
2079
2389
fprintf_plus(stderr, "No colon in address\n");
2080
2390
exitcode = EX_USAGE;
2085
2395
goto end;
2086
2396
}
2087
2397
2088
uint16_t port;
2398
in_port_t port;
2089
2399
errno = 0;
2090
2400
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2401
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2402
or tmpmax != (in_port_t)tmpmax){
2093
2403
fprintf_plus(stderr, "Bad port number\n");
2094
2404
exitcode = EX_USAGE;
2095
2405
goto end;
2096
2406
}
2097
2407
2098
2408
if(quit_now){
2099
2409
goto end;
2100
2410
}
2101
2411
2102
port = (uint16_t)tmpmax;
2412
port = (in_port_t)tmpmax;
2103
2413
*address = '\0';
2104
2414
/* Colon in address indicates IPv6 */
2105
2415
int af;
2121
2431
}
2122
2432
2123
2433
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2125
2436
if(quit_now or ret == 0){
2126
2437
break;
2127
2438
}
2129
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2441
(int)retry_interval);
2131
2442
}
2132
sleep((int)retry_interval);
2443
sleep((unsigned int)retry_interval);
2133
2444
}
2134
2445
2135
if (not quit_now){
2446
if(not quit_now){
2136
2447
exitcode = EXIT_SUCCESS;
2137
2448
}
2138
2449
2153
2464
config.publish_domain = 0;
2154
2465
2155
2466
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2159
2469
2160
2470
/* Free the Avahi configuration data */
2161
2471
avahi_server_config_free(&config);
2164
2474
/* Check if creating the Avahi server object succeeded */
2165
2475
if(mc.server == NULL){
2166
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2477
avahi_strerror(ret_errno));
2168
2478
exitcode = EX_UNAVAILABLE;
2169
2479
goto end;
2170
2480
}
2176
2486
/* Create the Avahi service browser */
2177
2487
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2488
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2180
2491
if(sb == NULL){
2181
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2493
avahi_strerror(avahi_server_errno(mc.server)));
2193
2504
if(debug){
2194
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2506
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2199
2510
if(debug){
2200
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2512
(ret == 0) ? "successfully" : "with error");
2208
2519
}
2209
2520
2210
2521
/* Cleanup things */
2522
free(mc.interfaces);
2523
2211
2524
if(sb != NULL)
2212
2525
avahi_s_service_browser_free(sb);
2213
2526
2214
2527
if(mc.server != NULL)
2215
2528
avahi_server_free(mc.server);
2216
2529
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2219
2532
2220
2533
if(gnutls_initialized){
2221
2534
gnutls_certificate_free_credentials(mc.cred);
2238
2551
}
2239
2552
}
2240
2553
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2554
/* Re-raise privileges */
2245
2555
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2250
2583
}
2251
2584
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2268
2589
}
2269
2590
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2591
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2276
2594
2277
2595
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2596
if(tempdir != NULL){
2279
2597
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2299
2634
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2310
2636
}
2311
2637
}
2312
2638
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0