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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
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() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
91
97
92
98
#ifdef __linux__
93
99
#include <sys/klog.h> /* klogctl() */
135
141
static const char sys_class_net[] = "/sys/class/net";
136
142
char *connect_to = NULL;
137
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
138
146
139
147
/* Doubly linked list that need to be circularly linked when used */
140
148
typedef struct server{
141
149
const char *ip;
142
uint16_t port;
150
in_port_t port;
143
151
AvahiIfIndex if_index;
144
152
int af;
145
153
struct timespec last_seen;
149
157
150
158
/* Used for passing in values through the Avahi callback functions */
151
159
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
160
AvahiServer *server;
154
161
gnutls_certificate_credentials_t cred;
155
162
unsigned int dh_bits;
157
164
const char *priority;
158
165
gpgme_ctx_t ctx;
159
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
160
169
} mandos_context;
161
170
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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
167
173
168
174
sig_atomic_t quit_now = 0;
169
175
int signal_received = 0;
177
183
perror(print_text);
178
184
}
179
185
180
__attribute__((format (gnu_printf, 2, 3)))
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
187
int fprintf_plus(FILE *stream, const char *format, ...){
182
188
va_list ap;
183
189
va_start (ap, format);
184
190
185
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
192
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
194
}
189
195
190
196
/*
192
198
* bytes. "buffer_capacity" is how much is currently allocated,
193
199
* "buffer_length" is how much is already used.
194
200
*/
201
__attribute__((nonnull, warn_unused_result))
195
202
size_t incbuffer(char **buffer, size_t buffer_length,
196
203
size_t buffer_capacity){
197
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
200
211
return 0;
201
212
}
213
*buffer = new_buf;
202
214
buffer_capacity += BUFFER_SIZE;
203
215
}
204
216
return buffer_capacity;
205
217
}
206
218
207
219
/* 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){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
210
223
int ret;
211
224
server *new_server = malloc(sizeof(server));
212
225
if(new_server == NULL){
221
234
perror_plus("strdup");
222
235
return false;
223
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
224
242
/* Special case of first server */
225
if (mc.current_server == NULL){
243
if(*current_server == NULL){
226
244
new_server->next = new_server;
227
245
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
246
*current_server = new_server;
230
247
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
233
251
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;
252
(*current_server)->prev = new_server;
240
253
}
241
254
return true;
242
255
}
244
257
/*
245
258
* Initialize GPGME.
246
259
*/
260
__attribute__((nonnull, warn_unused_result))
247
261
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
262
const char *tempdir, mandos_context *mc){
249
263
gpgme_error_t rc;
250
264
gpgme_engine_info_t engine_info;
251
265
252
253
266
/*
254
267
* Helper function to insert pub and seckey to the engine keyring.
255
268
*/
271
284
return false;
272
285
}
273
286
274
rc = gpgme_op_import(mc.ctx, pgp_data);
287
rc = gpgme_op_import(mc->ctx, pgp_data);
275
288
if(rc != GPG_ERR_NO_ERROR){
276
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
290
gpgme_strsource(rc), gpgme_strerror(rc));
321
334
}
322
335
323
336
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
337
rc = gpgme_new(&(mc->ctx));
325
338
if(rc != GPG_ERR_NO_ERROR){
326
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
353
* Decrypt OpenPGP data.
341
354
* Returns -1 on error
342
355
*/
356
__attribute__((nonnull, warn_unused_result))
343
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
358
size_t crypto_size,
345
char **plaintext){
359
char **plaintext,
360
mandos_context *mc){
346
361
gpgme_data_t dh_crypto, dh_plain;
347
362
gpgme_error_t rc;
348
363
ssize_t ret;
374
389
375
390
/* Decrypt data from the cryptotext data buffer to the plaintext
376
391
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
393
if(rc != GPG_ERR_NO_ERROR){
379
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
395
gpgme_strsource(rc), gpgme_strerror(rc));
381
396
plaintext_length = -1;
382
397
if(debug){
383
398
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
399
result = gpgme_op_decrypt_result(mc->ctx);
385
400
if(result == NULL){
386
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
402
} else {
464
479
return plaintext_length;
465
480
}
466
481
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
470
485
if(ret == NULL)
471
486
ret = "(unknown)";
472
487
return ret;
473
488
}
474
489
475
490
/* GnuTLS log function callback */
491
__attribute__((nonnull))
476
492
static void debuggnutls(__attribute__((unused)) int level,
477
493
const char* string){
478
494
fprintf_plus(stderr, "GnuTLS: %s", string);
479
495
}
480
496
497
__attribute__((nonnull, warn_unused_result))
481
498
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
499
const char *seckeyfilename,
500
mandos_context *mc){
483
501
int ret;
484
502
485
503
if(debug){
502
520
}
503
521
504
522
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
524
if(ret != GNUTLS_E_SUCCESS){
507
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
526
safer_gnutls_strerror(ret));
518
536
}
519
537
520
538
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
539
(mc->cred, pubkeyfilename, seckeyfilename,
522
540
GNUTLS_OPENPGP_FMT_BASE64);
523
541
if(ret != GNUTLS_E_SUCCESS){
524
542
fprintf_plus(stderr,
530
548
}
531
549
532
550
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
551
ret = gnutls_dh_params_init(&mc->dh_params);
534
552
if(ret != GNUTLS_E_SUCCESS){
535
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
554
" initialization: %s\n",
537
555
safer_gnutls_strerror(ret));
538
556
goto globalfail;
539
557
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
559
if(ret != GNUTLS_E_SUCCESS){
542
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
561
safer_gnutls_strerror(ret));
544
562
goto globalfail;
545
563
}
546
564
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
566
549
567
return 0;
550
568
551
569
globalfail:
552
570
553
gnutls_certificate_free_credentials(mc.cred);
571
gnutls_certificate_free_credentials(mc->cred);
554
572
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
573
gnutls_dh_params_deinit(mc->dh_params);
556
574
return -1;
557
575
}
558
576
559
static int init_gnutls_session(gnutls_session_t *session){
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
560
580
int ret;
561
581
/* GnuTLS session creation */
562
582
do {
574
594
{
575
595
const char *err;
576
596
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
598
if(quit_now){
579
599
gnutls_deinit(*session);
580
600
return -1;
591
611
592
612
do {
593
613
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
614
mc->cred);
595
615
if(quit_now){
596
616
gnutls_deinit(*session);
597
617
return -1;
607
627
/* ignore client certificate if any. */
608
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
629
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
631
612
632
return 0;
613
633
}
617
637
__attribute__((unused)) const char *txt){}
618
638
619
639
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
621
642
AvahiIfIndex if_index,
622
int af){
643
int af, mandos_context *mc){
623
644
int ret, tcp_sd = -1;
624
645
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
646
struct sockaddr_storage to;
629
647
char *buffer = NULL;
630
648
char *decrypted_buffer = NULL;
631
649
size_t buffer_length = 0;
655
673
return -1;
656
674
}
657
675
658
ret = init_gnutls_session(&session);
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
659
709
if(ret != 0){
660
710
return -1;
661
711
}
662
712
663
713
if(debug){
664
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
715
PRIuMAX "\n", ip, (uintmax_t)port);
666
716
}
667
717
668
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
730
681
731
memset(&to, 0, sizeof(to));
682
732
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
735
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
738
}
689
739
if(ret < 0 ){
690
740
int e = errno;
699
749
goto mandos_end;
700
750
}
701
751
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*/
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
755
if(if_index == AVAHI_IF_UNSPEC){
710
756
fprintf_plus(stderr, "An IPv6 link-local address is"
711
757
" incomplete without a network interface\n");
713
759
goto mandos_end;
714
760
}
715
761
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
763
}
718
764
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
766
}
723
767
724
768
if(quit_now){
732
776
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
777
perror_plus("if_indextoname");
734
778
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
737
781
}
738
782
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
741
785
}
742
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
788
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
748
793
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
751
798
}
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
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
805
}
759
806
}
760
807
764
811
}
765
812
766
813
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
768
816
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
770
819
}
771
820
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
822
int e = errno;
774
823
perror_plus("connect");
775
824
errno = e;
821
870
goto mandos_end;
822
871
}
823
872
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
878
827
879
if(quit_now){
828
880
errno = EINTR;
933
985
if(buffer_length > 0){
934
986
ssize_t decrypted_buffer_size;
935
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
988
&decrypted_buffer, mc);
937
989
if(decrypted_buffer_size >= 0){
938
990
939
991
written = 0;
987
1039
return retval;
988
1040
}
989
1041
1042
__attribute__((nonnull))
990
1043
static void resolve_callback(AvahiSServiceResolver *r,
991
1044
AvahiIfIndex interface,
992
1045
AvahiProtocol proto,
1000
1053
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1055
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
1005
1060
1006
1061
/* Called whenever a service has been resolved successfully or
1007
1062
timed out */
1016
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1073
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
1020
1076
break;
1021
1077
1022
1078
case AVAHI_RESOLVER_FOUND:
1028
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1085
host_name, ip, (intmax_t)interface, port);
1030
1086
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
1033
1091
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1092
avahi_simple_poll_quit(simple_poll);
1035
1093
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1038
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1098
" list\n", name);
1040
1099
}
1053
1112
const char *domain,
1054
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1114
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
1058
1119
1059
1120
/* Called whenever a new services becomes available on the LAN or
1060
1121
is removed from the LAN */
1068
1129
case AVAHI_BROWSER_FAILURE:
1069
1130
1070
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
1073
1135
return;
1074
1136
1075
1137
case AVAHI_BROWSER_NEW:
1078
1140
the callback function is called the Avahi server will free the
1079
1141
resolver for us. */
1080
1142
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1084
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1148
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
1087
1151
break;
1088
1152
1089
1153
case AVAHI_BROWSER_REMOVE:
1108
1172
signal_received = sig;
1109
1173
int old_errno = errno;
1110
1174
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1113
1177
}
1114
1178
errno = old_errno;
1115
1179
}
1116
1180
1181
__attribute__((nonnull, warn_unused_result))
1117
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1183
int ret;
1184
error_t ret_errno;
1119
1185
1120
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1187
if(s < 0){
1188
ret_errno = errno;
1122
1189
perror_plus("socket");
1190
errno = ret_errno;
1123
1191
return false;
1124
1192
}
1125
1193
strcpy(ifr->ifr_name, ifname);
1126
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1195
if(ret == -1){
1128
1196
if(debug){
1197
ret_errno = errno;
1129
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1130
1200
}
1131
1201
return false;
1132
1202
}
1133
1203
return true;
1134
1204
}
1135
1205
1206
__attribute__((nonnull, warn_unused_result))
1136
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1208
1138
1209
/* Reject the loopback device */
1180
1251
* corresponds to an acceptable network device.
1181
1252
* (This function is passed to scandir(3) as a filter function.)
1182
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1183
1255
int good_interface(const struct dirent *if_entry){
1184
1256
if(if_entry->d_name[0] == '.'){
1185
1257
return 0;
1201
1273
}
1202
1274
1203
1275
/*
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
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1246
1310
int notdotentries(const struct dirent *direntry){
1247
1311
/* Skip "." and ".." */
1248
1312
if(direntry->d_name[0] == '.'
1255
1319
}
1256
1320
1257
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1258
1323
int runnable_hook(const struct dirent *direntry){
1259
1324
int ret;
1260
1325
size_t sret;
1315
1380
return 1;
1316
1381
}
1317
1382
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1319
1386
int ret;
1320
1387
struct timespec now;
1321
1388
struct timespec waited_time;
1322
1389
intmax_t block_time;
1323
1390
1324
1391
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1392
if(mc->current_server == NULL){
1393
if(debug){
1327
1394
fprintf_plus(stderr, "Wait until first server is found."
1328
1395
" No timeout!\n");
1329
1396
}
1330
1397
ret = avahi_simple_poll_iterate(s, -1);
1331
1398
} else {
1332
if (debug){
1399
if(debug){
1333
1400
fprintf_plus(stderr, "Check current_server if we should run"
1334
1401
" it, or wait\n");
1335
1402
}
1342
1409
/* Calculating in ms how long time between now and server
1343
1410
who we visted longest time ago. Now - last seen. */
1344
1411
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1412
- mc->current_server->last_seen.tv_sec);
1346
1413
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1414
- mc->current_server->last_seen.tv_nsec);
1348
1415
/* total time is 10s/10,000ms.
1349
1416
Converting to s from ms by dividing by 1,000,
1350
1417
and ns to ms by dividing by 1,000,000. */
1352
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1421
1355
if (debug){
1422
if(debug){
1356
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1424
block_time);
1358
1425
}
1359
1426
1360
1427
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);
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1365
1432
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1433
avahi_simple_poll_quit(s);
1367
1434
return 0;
1368
1435
}
1369
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1437
&mc->current_server->last_seen);
1371
1438
if(ret == -1){
1372
1439
perror_plus("clock_gettime");
1373
1440
return -1;
1374
1441
}
1375
mc.current_server = mc.current_server->next;
1442
mc->current_server = mc->current_server->next;
1376
1443
block_time = 0; /* Call avahi to find new Mandos
1377
1444
servers, but don't block */
1378
1445
}
1380
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1448
}
1382
1449
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1450
if(ret > 0 or errno != EINTR){
1384
1451
return (ret != 1) ? ret : 0;
1385
1452
}
1386
1453
}
1387
1454
}
1388
1455
}
1389
1456
1390
bool run_network_hooks(const char *mode, const char *interface,
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1391
1515
const float delay){
1392
1516
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
1518
alphasort);
1397
1519
if(numhooks == -1){
1398
perror_plus("scandir");
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1399
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1400
1531
int devnull = open("/dev/null", O_RDONLY);
1401
1532
for(int i = 0; i < numhooks; i++){
1402
1533
direntry = direntries[i];
1414
1545
if(hook_pid == 0){
1415
1546
/* Child */
1416
1547
/* 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");
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1427
1551
}
1428
1552
/* Set group */
1429
1553
errno = 0;
1430
1554
ret = setgid(0);
1431
1555
if(ret == -1){
1432
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1433
1558
}
1434
1559
/* Reset supplementary groups */
1435
1560
errno = 0;
1436
1561
ret = setgroups(0, NULL);
1437
1562
if(ret == -1){
1438
1563
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1443
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
1582
if(ret == -1){
1445
1583
perror_plus("setenv");
1461
1599
_exit(EX_OSERR);
1462
1600
}
1463
1601
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1465
1603
if(ret == -1){
1466
1604
perror_plus("asprintf");
1467
1605
_exit(EX_OSERR);
1520
1658
}
1521
1659
close(devnull);
1522
1660
}
1523
return true;
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1524
1859
}
1525
1860
1526
1861
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1527
1866
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1867
error_t ret_errno;
1529
1868
int ret;
1530
1869
intmax_t tmpmax;
1531
1870
char *tmp;
1532
1871
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;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1539
1874
char tempdir[] = "/tmp/mandosXXXXXX";
1540
1875
bool tempdir_created = false;
1541
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
1877
const char *seckey = PATHDIR "/" SECKEY;
1543
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1544
1880
1545
1881
bool gnutls_initialized = false;
1546
1882
bool gpgme_initialized = false;
1637
1973
connect_to = arg;
1638
1974
break;
1639
1975
case 'i': /* --interface */
1640
interface = arg;
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1641
1981
break;
1642
1982
case 's': /* --seckey */
1643
1983
seckey = arg;
1720
2060
/* Work around Debian bug #633582:
1721
2061
<http://bugs.debian.org/633582> */
1722
2062
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
1728
2068
} else {
1729
2069
struct stat st;
1730
2070
1771
2111
}
1772
2112
1773
2113
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
1778
2135
}
1779
2136
}
1780
2137
}
1781
2138
1782
2139
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1785
2152
}
1786
2153
1787
2154
if(not debug){
1788
2155
avahi_set_log_function(empty_log);
1789
2156
}
1790
2157
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
2158
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2159
from the signal handler */
1825
2160
/* Initialize the pseudo-RNG for Avahi */
1826
2161
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
1829
2164
fprintf_plus(stderr,
1830
2165
"Avahi: Failed to create simple poll object.\n");
1831
2166
exitcode = EX_UNAVAILABLE;
1895
2230
}
1896
2231
}
1897
2232
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");
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
1983
2280
}
1984
2281
}
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
2282
break;
2003
2283
}
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
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2311
}
2034
2312
2035
2313
if(quit_now){
2036
2314
goto end;
2037
2315
}
2038
2316
2039
ret = init_gnutls_global(pubkey, seckey);
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
2040
2318
if(ret == -1){
2041
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2320
exitcode = EX_UNAVAILABLE;
2059
2337
goto end;
2060
2338
}
2061
2339
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2341
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2342
exitcode = EX_UNAVAILABLE;
2065
2343
goto end;
2075
2353
/* Connect directly, do not use Zeroconf */
2076
2354
/* (Mainly meant for debugging) */
2077
2355
char *address = strrchr(connect_to, ':');
2356
2078
2357
if(address == NULL){
2079
2358
fprintf_plus(stderr, "No colon in address\n");
2080
2359
exitcode = EX_USAGE;
2085
2364
goto end;
2086
2365
}
2087
2366
2088
uint16_t port;
2367
in_port_t port;
2089
2368
errno = 0;
2090
2369
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2370
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2371
or tmpmax != (in_port_t)tmpmax){
2093
2372
fprintf_plus(stderr, "Bad port number\n");
2094
2373
exitcode = EX_USAGE;
2095
2374
goto end;
2096
2375
}
2097
2376
2098
2377
if(quit_now){
2099
2378
goto end;
2100
2379
}
2101
2380
2102
port = (uint16_t)tmpmax;
2381
port = (in_port_t)tmpmax;
2103
2382
*address = '\0';
2104
2383
/* Colon in address indicates IPv6 */
2105
2384
int af;
2121
2400
}
2122
2401
2123
2402
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2125
2405
if(quit_now or ret == 0){
2126
2406
break;
2127
2407
}
2129
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2410
(int)retry_interval);
2131
2411
}
2132
sleep((int)retry_interval);
2412
sleep((unsigned int)retry_interval);
2133
2413
}
2134
2414
2135
if (not quit_now){
2415
if(not quit_now){
2136
2416
exitcode = EXIT_SUCCESS;
2137
2417
}
2138
2418
2153
2433
config.publish_domain = 0;
2154
2434
2155
2435
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
2159
2438
2160
2439
/* Free the Avahi configuration data */
2161
2440
avahi_server_config_free(&config);
2164
2443
/* Check if creating the Avahi server object succeeded */
2165
2444
if(mc.server == NULL){
2166
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2446
avahi_strerror(ret_errno));
2168
2447
exitcode = EX_UNAVAILABLE;
2169
2448
goto end;
2170
2449
}
2176
2455
/* Create the Avahi service browser */
2177
2456
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2457
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
2180
2460
if(sb == NULL){
2181
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2462
avahi_strerror(avahi_server_errno(mc.server)));
2194
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2475
}
2196
2476
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2199
2479
if(debug){
2200
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2481
(ret == 0) ? "successfully" : "with error");
2208
2488
}
2209
2489
2210
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
2211
2493
if(sb != NULL)
2212
2494
avahi_s_service_browser_free(sb);
2213
2495
2214
2496
if(mc.server != NULL)
2215
2497
avahi_server_free(mc.server);
2216
2498
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
2219
2501
2220
2502
if(gnutls_initialized){
2221
2503
gnutls_certificate_free_credentials(mc.cred);
2238
2520
}
2239
2521
}
2240
2522
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2523
/* Re-raise privileges */
2245
2524
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
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
}
2268
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2276
2560
2277
2561
/* Removes the GPGME temp directory and all files inside */
2278
2562
if(tempdir_created){
2280
2564
struct dirent *direntry = NULL;
2281
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
2566
alphasort);
2283
if (numentries > 0){
2567
if(numentries > 0){
2284
2568
for(int i = 0; i < numentries; i++){
2285
2569
direntry = direntries[i];
2286
2570
char *fullname = NULL;
2301
2585
2302
2586
/* need to clean even if 0 because man page doesn't specify */
2303
2587
free(direntries);
2304
if (numentries == -1){
2588
if(numentries == -1){
2305
2589
perror_plus("scandir");
2306
2590
}
2307
2591
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0