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- Committer: Teddy Hogeborn
- Date: 2015-07-08 21:18:49 UTC
- Revision ID: teddy@recompile.se-20150708211849-scisutuofnxumqc7
mandos-client: Add --dh-params FILE option.
* plugins.d/mandos-client.c: Added --dh-params FILE option.
(init_gnutls_global): New "dhparamsfilename" argument. All callers
changed. Read and use Diffie-Hellman
parameters from it. Bug fix: check for error
when opening seckeyfile for the second time.
(init_gnutls_session): Remove unnecessary call to
gnutls_dh_set_prime_bits();
(main): New variable "dh_params_file".
(main/argp_options): Added "--dh-params" option.
(main/parse_opt): - '' -
* plugins.d/mandos-client.xml (SYNOPSIS): Add --dh-params option.
(OPTIONS): Document --dh-params option and document that the
--dh-bits options is potentially overridden by the
--dh-params option.
* plugins.d/mandos-client.c: Added --dh-params FILE option.
(init_gnutls_global): New "dhparamsfilename" argument. All callers
changed. Read and use Diffie-Hellman
parameters from it. Bug fix: check for error
when opening seckeyfile for the second time.
(init_gnutls_session): Remove unnecessary call to
gnutls_dh_set_prime_bits();
(main): New variable "dh_params_file".
(main/argp_options): Added "--dh-params" option.
(main/parse_opt): - '' -
* plugins.d/mandos-client.xml (SYNOPSIS): Add --dh-params option.
(OPTIONS): Document --dh-params option and document that the
--dh-bits options is potentially overridden by the
--dh-params option.
- files added:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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() */
43
stdout, ferror() */
44
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(),
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,
92
93
argz_delete(), argz_append(),
93
94
argz_stringify(), argz_add(),
94
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
95
98
96
99
#ifdef __linux__
97
100
#include <sys/klog.h> /* klogctl() */
139
142
static const char sys_class_net[] = "/sys/class/net";
140
143
char *connect_to = NULL;
141
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
142
146
uid_t uid = 65534;
143
147
gid_t gid = 65534;
144
148
145
149
/* Doubly linked list that need to be circularly linked when used */
146
150
typedef struct server{
147
151
const char *ip;
148
uint16_t port;
152
in_port_t port;
149
153
AvahiIfIndex if_index;
150
154
int af;
151
155
struct timespec last_seen;
155
159
156
160
/* Used for passing in values through the Avahi callback functions */
157
161
typedef struct {
158
AvahiSimplePoll *simple_poll;
159
162
AvahiServer *server;
160
163
gnutls_certificate_credentials_t cred;
161
164
unsigned int dh_bits;
163
166
const char *priority;
164
167
gpgme_ctx_t ctx;
165
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
166
171
} mandos_context;
167
172
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
173
175
174
176
sig_atomic_t quit_now = 0;
175
177
int signal_received = 0;
183
185
perror(print_text);
184
186
}
185
187
186
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
189
int fprintf_plus(FILE *stream, const char *format, ...){
188
190
va_list ap;
189
191
va_start (ap, format);
190
192
191
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
194
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
196
}
195
197
196
198
/*
198
200
* bytes. "buffer_capacity" is how much is currently allocated,
199
201
* "buffer_length" is how much is already used.
200
202
*/
203
__attribute__((nonnull, warn_unused_result))
201
204
size_t incbuffer(char **buffer, size_t buffer_length,
202
205
size_t buffer_capacity){
203
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
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;
206
213
return 0;
207
214
}
215
*buffer = new_buf;
208
216
buffer_capacity += BUFFER_SIZE;
209
217
}
210
218
return buffer_capacity;
211
219
}
212
220
213
221
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
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){
216
225
int ret;
217
226
server *new_server = malloc(sizeof(server));
218
227
if(new_server == NULL){
225
234
.af = af };
226
235
if(new_server->ip == NULL){
227
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
228
252
return false;
229
253
}
230
254
/* Special case of first server */
231
if (mc.current_server == NULL){
255
if(*current_server == NULL){
232
256
new_server->next = new_server;
233
257
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
258
*current_server = new_server;
236
259
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
239
263
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
264
(*current_server)->prev = new_server;
246
265
}
247
266
return true;
248
267
}
250
269
/*
251
270
* Initialize GPGME.
252
271
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
255
277
gpgme_error_t rc;
256
278
gpgme_engine_info_t engine_info;
257
279
258
259
280
/*
260
281
* Helper function to insert pub and seckey to the engine keyring.
261
282
*/
262
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
263
284
int ret;
264
285
int fd;
265
286
gpgme_data_t pgp_data;
277
298
return false;
278
299
}
279
300
280
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
281
302
if(rc != GPG_ERR_NO_ERROR){
282
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
304
gpgme_strsource(rc), gpgme_strerror(rc));
327
348
}
328
349
329
350
/* Create new GPGME "context" */
330
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
331
352
if(rc != GPG_ERR_NO_ERROR){
332
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
346
367
* Decrypt OpenPGP data.
347
368
* Returns -1 on error
348
369
*/
370
__attribute__((nonnull, warn_unused_result))
349
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
350
372
size_t crypto_size,
351
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
352
375
gpgme_data_t dh_crypto, dh_plain;
353
376
gpgme_error_t rc;
354
377
ssize_t ret;
380
403
381
404
/* Decrypt data from the cryptotext data buffer to the plaintext
382
405
data buffer */
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
384
407
if(rc != GPG_ERR_NO_ERROR){
385
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
409
gpgme_strsource(rc), gpgme_strerror(rc));
387
410
plaintext_length = -1;
388
411
if(debug){
389
412
gpgme_decrypt_result_t result;
390
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
391
414
if(result == NULL){
392
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
416
} else {
470
493
return plaintext_length;
471
494
}
472
495
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
476
if(ret == NULL)
477
ret = "(unknown)";
478
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
479
507
}
480
508
481
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
482
511
static void debuggnutls(__attribute__((unused)) int level,
483
512
const char* string){
484
513
fprintf_plus(stderr, "GnuTLS: %s", string);
485
514
}
486
515
516
__attribute__((nonnull, warn_unused_result))
487
517
static int init_gnutls_global(const char *pubkeyfilename,
488
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
489
521
int ret;
522
unsigned int uret;
490
523
491
524
if(debug){
492
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
508
541
}
509
542
510
543
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
512
545
if(ret != GNUTLS_E_SUCCESS){
513
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
547
safer_gnutls_strerror(ret));
524
557
}
525
558
526
559
ret = gnutls_certificate_set_openpgp_key_file
527
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
528
561
GNUTLS_OPENPGP_FMT_BASE64);
529
562
if(ret != GNUTLS_E_SUCCESS){
530
563
fprintf_plus(stderr,
536
569
}
537
570
538
571
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
540
573
if(ret != GNUTLS_E_SUCCESS){
541
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
575
" initialization: %s\n",
543
576
safer_gnutls_strerror(ret));
544
577
goto globalfail;
545
578
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
752
555
753
return 0;
556
754
557
755
globalfail:
558
756
559
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
560
758
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
562
760
return -1;
563
761
}
564
762
565
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
566
766
int ret;
567
767
/* GnuTLS session creation */
568
768
do {
580
780
{
581
781
const char *err;
582
782
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
784
if(quit_now){
585
785
gnutls_deinit(*session);
586
786
return -1;
597
797
598
798
do {
599
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
mc.cred);
800
mc->cred);
601
801
if(quit_now){
602
802
gnutls_deinit(*session);
603
803
return -1;
613
813
/* ignore client certificate if any. */
614
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
615
815
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
617
618
816
return 0;
619
817
}
620
818
622
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
623
821
__attribute__((unused)) const char *txt){}
624
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
625
1040
/* Called when a Mandos server is found */
626
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
627
1043
AvahiIfIndex if_index,
628
int af){
1044
int af, mandos_context *mc){
629
1045
int ret, tcp_sd = -1;
630
1046
ssize_t sret;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
1047
struct sockaddr_storage to;
635
1048
char *buffer = NULL;
636
1049
char *decrypted_buffer = NULL;
637
1050
size_t buffer_length = 0;
640
1053
int retval = -1;
641
1054
gnutls_session_t session;
642
1055
int pf; /* Protocol family */
1056
bool route_added = false;
643
1057
644
1058
errno = 0;
645
1059
661
1075
return -1;
662
1076
}
663
1077
664
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
665
1111
if(ret != 0){
666
1112
return -1;
667
1113
}
668
1114
669
1115
if(debug){
670
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
1117
PRIuMAX "\n", ip, (uintmax_t)port);
672
1118
}
673
1119
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
675
1121
if(tcp_sd < 0){
676
1122
int e = errno;
677
1123
perror_plus("socket");
686
1132
687
1133
memset(&to, 0, sizeof(to));
688
1134
if(af == AF_INET6){
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
691
1137
} else { /* IPv4 */
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
694
1140
}
695
1141
if(ret < 0 ){
696
1142
int e = errno;
705
1151
goto mandos_end;
706
1152
}
707
1153
if(af == AF_INET6){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
715
1157
if(if_index == AVAHI_IF_UNSPEC){
716
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
717
1159
" incomplete without a network interface\n");
719
1161
goto mandos_end;
720
1162
}
721
1163
/* Set the network interface number as scope */
722
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
723
1165
}
724
1166
} else {
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
728
1168
}
729
1169
730
1170
if(quit_now){
738
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
1179
perror_plus("if_indextoname");
740
1180
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
743
1183
}
744
1184
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
747
1187
}
748
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
const char *pcret;
751
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
754
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
757
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
760
} else {
761
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
}
764
}
765
}
766
767
if(quit_now){
768
errno = EINTR;
769
goto mandos_end;
770
}
771
772
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
774
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
}
777
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
783
goto mandos_end;
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
789
1270
}
790
1271
791
1272
const char *out = mandos_protocol_version;
942
1423
if(buffer_length > 0){
943
1424
ssize_t decrypted_buffer_size;
944
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
945
&decrypted_buffer);
1426
&decrypted_buffer, mc);
946
1427
if(decrypted_buffer_size >= 0){
947
1428
948
1429
written = 0;
974
1455
975
1456
mandos_end:
976
1457
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
977
1464
int e = errno;
978
1465
free(decrypted_buffer);
979
1466
free(buffer);
996
1483
return retval;
997
1484
}
998
1485
1486
__attribute__((nonnull))
999
1487
static void resolve_callback(AvahiSServiceResolver *r,
1000
1488
AvahiIfIndex interface,
1001
1489
AvahiProtocol proto,
1009
1497
AVAHI_GCC_UNUSED AvahiStringList *txt,
1010
1498
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1011
1499
flags,
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
1014
1504
1015
1505
/* Called whenever a service has been resolved successfully or
1016
1506
timed out */
1017
1507
1018
1508
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1019
1510
return;
1020
1511
}
1021
1512
1025
1516
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
1517
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
1518
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
1519
avahi_strerror(avahi_server_errno
1520
(((mandos_context*)mc)->server)));
1029
1521
break;
1030
1522
1031
1523
case AVAHI_RESOLVER_FOUND:
1037
1529
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
1530
host_name, ip, (intmax_t)interface, port);
1039
1531
}
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
1042
1536
if(ret == 0){
1043
avahi_simple_poll_quit(mc.simple_poll);
1537
avahi_simple_poll_quit(simple_poll);
1044
1538
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1539
if(not add_server(ip, (in_port_t)port, interface,
1540
avahi_proto_to_af(proto),
1541
&((mandos_context*)mc)->current_server)){
1047
1542
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
1543
" list\n", name);
1049
1544
}
1062
1557
const char *domain,
1063
1558
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1064
1559
flags,
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
1067
1564
1068
1565
/* Called whenever a new services becomes available on the LAN or
1069
1566
is removed from the LAN */
1077
1574
case AVAHI_BROWSER_FAILURE:
1078
1575
1079
1576
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1577
avahi_strerror(avahi_server_errno
1578
(((mandos_context*)mc)->server)));
1579
avahi_simple_poll_quit(simple_poll);
1082
1580
return;
1083
1581
1084
1582
case AVAHI_BROWSER_NEW:
1087
1585
the callback function is called the Avahi server will free the
1088
1586
resolver for us. */
1089
1587
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1588
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1589
interface, protocol, name, type,
1590
domain, protocol, 0,
1591
resolve_callback, mc) == NULL)
1093
1592
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1593
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1096
1596
break;
1097
1597
1098
1598
case AVAHI_BROWSER_REMOVE:
1117
1617
signal_received = sig;
1118
1618
int old_errno = errno;
1119
1619
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1122
1622
}
1123
1623
errno = old_errno;
1124
1624
}
1125
1625
1626
__attribute__((nonnull, warn_unused_result))
1126
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1628
int ret;
1128
1629
error_t ret_errno;
1147
1648
return true;
1148
1649
}
1149
1650
1651
__attribute__((nonnull, warn_unused_result))
1150
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1653
1152
1654
/* Reject the loopback device */
1194
1696
* corresponds to an acceptable network device.
1195
1697
* (This function is passed to scandir(3) as a filter function.)
1196
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1197
1700
int good_interface(const struct dirent *if_entry){
1198
1701
if(if_entry->d_name[0] == '.'){
1199
1702
return 0;
1217
1720
/*
1218
1721
* This function determines if a network interface is up.
1219
1722
*/
1723
__attribute__((nonnull, warn_unused_result))
1220
1724
bool interface_is_up(const char *interface){
1221
1725
struct ifreq ifr;
1222
1726
if(not get_flags(interface, &ifr)){
1233
1737
/*
1234
1738
* This function determines if a network interface is running
1235
1739
*/
1740
__attribute__((nonnull, warn_unused_result))
1236
1741
bool interface_is_running(const char *interface){
1237
1742
struct ifreq ifr;
1238
1743
if(not get_flags(interface, &ifr)){
1246
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1752
}
1248
1753
1754
__attribute__((nonnull, pure, warn_unused_result))
1249
1755
int notdotentries(const struct dirent *direntry){
1250
1756
/* Skip "." and ".." */
1251
1757
if(direntry->d_name[0] == '.'
1258
1764
}
1259
1765
1260
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1261
1768
int runnable_hook(const struct dirent *direntry){
1262
1769
int ret;
1263
1770
size_t sret;
1271
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1779
"abcdefghijklmnopqrstuvwxyz"
1273
1780
"0123456789"
1274
"_-");
1781
"_.-");
1275
1782
if((direntry->d_name)[sret] != '\0'){
1276
1783
/* Contains non-allowed characters */
1277
1784
if(debug){
1281
1788
return 0;
1282
1789
}
1283
1790
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1792
if(ret == -1){
1293
1793
if(debug){
1294
1794
perror_plus("Could not stat hook");
1318
1818
return 1;
1319
1819
}
1320
1820
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1322
1824
int ret;
1323
1825
struct timespec now;
1324
1826
struct timespec waited_time;
1325
1827
intmax_t block_time;
1326
1828
1327
1829
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1830
if(mc->current_server == NULL){
1831
if(debug){
1330
1832
fprintf_plus(stderr, "Wait until first server is found."
1331
1833
" No timeout!\n");
1332
1834
}
1333
1835
ret = avahi_simple_poll_iterate(s, -1);
1334
1836
} else {
1335
if (debug){
1837
if(debug){
1336
1838
fprintf_plus(stderr, "Check current_server if we should run"
1337
1839
" it, or wait\n");
1338
1840
}
1345
1847
/* Calculating in ms how long time between now and server
1346
1848
who we visted longest time ago. Now - last seen. */
1347
1849
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1850
- mc->current_server->last_seen.tv_sec);
1349
1851
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1852
- mc->current_server->last_seen.tv_nsec);
1351
1853
/* total time is 10s/10,000ms.
1352
1854
Converting to s from ms by dividing by 1,000,
1353
1855
and ns to ms by dividing by 1,000,000. */
1355
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1859
1358
if (debug){
1860
if(debug){
1359
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1862
block_time);
1361
1863
}
1362
1864
1363
1865
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1368
1870
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1871
avahi_simple_poll_quit(s);
1370
1872
return 0;
1371
1873
}
1372
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1875
&mc->current_server->last_seen);
1374
1876
if(ret == -1){
1375
1877
perror_plus("clock_gettime");
1376
1878
return -1;
1377
1879
}
1378
mc.current_server = mc.current_server->next;
1880
mc->current_server = mc->current_server->next;
1379
1881
block_time = 0; /* Call avahi to find new Mandos
1380
1882
servers, but don't block */
1381
1883
}
1383
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1886
}
1385
1887
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1888
if(ret > 0 or errno != EINTR){
1387
1889
return (ret != 1) ? ret : 0;
1388
1890
}
1389
1891
}
1390
1892
}
1391
1893
}
1392
1894
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1446
1897
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1452
1926
if(numhooks == -1){
1453
1927
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1461
1989
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1520
1994
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
1532
2063
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
1569
2083
}
1570
2084
2085
__attribute__((nonnull, warn_unused_result))
1571
2086
error_t bring_up_interface(const char *const interface,
1572
2087
const float delay){
1573
int sd = -1;
1574
2088
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
2089
int ret;
1577
2090
struct ifreq network;
1578
2091
unsigned int if_index = if_nametoindex(interface);
1579
2092
if(if_index == 0){
1588
2101
}
1589
2102
1590
2103
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
1592
2106
ret_errno = errno;
1593
2107
fprintf_plus(stderr, "Failed to get flags for interface "
1594
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
1595
2110
return ret_errno;
1596
2111
}
1597
network.ifr_flags |= IFF_UP;
2112
network.ifr_flags |= IFF_UP; /* set flag */
1598
2113
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
1601
2116
ret_errno = errno;
1602
2117
perror_plus("socket");
1603
2118
errno = old_errno;
1604
2119
return ret_errno;
1605
2120
}
1606
2121
1607
2122
if(quit_now){
1608
close(sd);
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
1609
2127
errno = old_errno;
1610
2128
return EINTR;
1611
2129
}
1615
2133
interface);
1616
2134
}
1617
2135
1618
/* Raise priviliges */
1619
raise_privileges();
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
1620
2142
1621
2143
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
1629
2155
}
1630
2156
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
1633
2159
#ifdef __linux__
1634
2160
if(restore_loglevel){
1635
2161
ret_linux = klogctl(7, NULL, 0);
1639
2165
}
1640
2166
#endif /* __linux__ */
1641
2167
1642
/* Lower privileges */
1643
lower_privileges();
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
1644
2177
1645
2178
/* Close the socket */
1646
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1649
2182
}
1650
2183
1651
2184
if(ret_setflags == -1){
1652
errno = ret_errno;
2185
errno = ioctl_errno;
1653
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
2187
errno = old_errno;
1655
return ret_errno;
2188
return ioctl_errno;
1656
2189
}
1657
2190
} else if(debug){
1658
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1676
2209
return 0;
1677
2210
}
1678
2211
2212
__attribute__((nonnull, warn_unused_result))
1679
2213
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
2214
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
2215
struct ifreq network;
1685
2216
unsigned int if_index = if_nametoindex(interface);
1686
2217
if(if_index == 0){
1689
2220
return ENXIO;
1690
2221
}
1691
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
1692
2224
if(not get_flags(interface, &network) and debug){
1693
2225
ret_errno = errno;
1694
2226
fprintf_plus(stderr, "Failed to get flags for interface "
1695
2227
"\"%s\"\n", interface);
2228
errno = old_errno;
1696
2229
return ret_errno;
1697
2230
}
1698
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
2232
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
1702
2235
ret_errno = errno;
1703
2236
perror_plus("socket");
1704
2237
errno = old_errno;
1710
2243
interface);
1711
2244
}
1712
2245
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
2252
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2255
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
1721
2265
1722
2266
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
2268
if(ret == -1){
1725
2269
perror_plus("close");
1726
2270
}
1727
2271
1728
2272
if(ret_setflags == -1){
1729
errno = ret_errno;
2273
errno = ioctl_errno;
1730
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
2275
errno = old_errno;
1732
return ret_errno;
2276
return ioctl_errno;
1733
2277
}
1734
2278
} else if(debug){
1735
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
2285
}
1742
2286
1743
2287
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
1744
2292
AvahiSServiceBrowser *sb = NULL;
1745
2293
error_t ret_errno;
1746
2294
int ret;
1747
2295
intmax_t tmpmax;
1748
2296
char *tmp;
1749
2297
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
2298
char *interfaces_to_take_down = NULL;
1753
2299
size_t interfaces_to_take_down_size = 0;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
1756
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
2304
const char *seckey = PATHDIR "/" SECKEY;
1758
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
1759
2307
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
2308
1762
2309
bool gnutls_initialized = false;
1763
2310
bool gpgme_initialized = false;
1815
2362
.doc = "Bit length of the prime number used in the"
1816
2363
" Diffie-Hellman key exchange",
1817
2364
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
1818
2370
{ .name = "priority", .key = 130,
1819
2371
.arg = "STRING",
1820
2372
.doc = "GnuTLS priority string for the TLS handshake",
1854
2406
connect_to = arg;
1855
2407
break;
1856
2408
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2410
arg, (int)',');
1859
2411
if(ret_errno != 0){
1860
2412
argp_error(state, "%s", strerror(ret_errno));
1861
2413
}
1875
2427
}
1876
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1877
2429
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
1878
2433
case 130: /* --priority */
1879
2434
mc.priority = arg;
1880
2435
break;
1936
2491
goto end;
1937
2492
}
1938
2493
}
1939
2494
1940
2495
{
1941
2496
/* Work around Debian bug #633582:
1942
2497
<http://bugs.debian.org/633582> */
1943
2498
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
2504
} else {
1946
2505
struct stat st;
1947
2506
1948
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1965
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
2525
}
1967
2526
}
1968
2527
1969
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
2529
int pubkey_fd = open(pubkey, O_RDONLY);
1971
2530
if(pubkey_fd == -1){
1986
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
2546
}
1988
2547
}
1989
2548
1990
2549
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2550
ret_errno = lower_privileges();
2551
if(ret_errno != 0){
2552
errno = ret_errno;
2553
perror_plus("Failed to lower privileges");
1995
2554
}
1996
2555
}
1997
2556
}
1998
2557
1999
/* Remove empty interface names */
2558
/* Remove invalid interface names (except "none") */
2000
2559
{
2001
2560
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2561
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2003
2562
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2563
if(strcmp(interface, "none") != 0
2564
and if_nametoindex(interface) == 0){
2565
if(interface[0] != '\0'){
2006
2566
fprintf_plus(stderr, "Not using nonexisting interface"
2007
2567
" \"%s\"\n", interface);
2008
2568
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2569
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2010
2570
interface = NULL;
2011
2571
}
2012
2572
}
2014
2574
2015
2575
/* Run network hooks */
2016
2576
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2577
if(mc.interfaces != NULL){
2578
interfaces_hooks = malloc(mc.interfaces_size);
2579
if(interfaces_hooks == NULL){
2580
perror_plus("malloc");
2581
goto end;
2582
}
2583
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2584
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2585
}
2586
run_network_hooks("start", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2028
2588
}
2029
2589
2030
2590
if(not debug){
2035
2595
from the signal handler */
2036
2596
/* Initialize the pseudo-RNG for Avahi */
2037
2597
srand((unsigned int) time(NULL));
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2598
simple_poll = avahi_simple_poll_new();
2599
if(simple_poll == NULL){
2040
2600
fprintf_plus(stderr,
2041
2601
"Avahi: Failed to create simple poll object.\n");
2042
2602
exitcode = EX_UNAVAILABLE;
2107
2667
}
2108
2668
2109
2669
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2670
if(mc.interfaces == NULL){
2671
struct dirent **direntries = NULL;
2112
2672
/* Look for any good interfaces */
2113
2673
ret = scandir(sys_class_net, &direntries, good_interface,
2114
2674
alphasort);
2115
2675
if(ret >= 1){
2116
2676
/* Add all found interfaces to interfaces list */
2117
2677
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2678
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2119
2679
direntries[i]->d_name);
2120
2680
if(ret_errno != 0){
2681
errno = ret_errno;
2121
2682
perror_plus("argz_add");
2683
free(direntries[i]);
2122
2684
continue;
2123
2685
}
2124
2686
if(debug){
2125
2687
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
2688
direntries[i]->d_name);
2127
2689
}
2690
free(direntries[i]);
2128
2691
}
2129
2692
free(direntries);
2130
2693
} else {
2131
free(direntries);
2694
if(ret == 0){
2695
free(direntries);
2696
}
2132
2697
fprintf_plus(stderr, "Could not find a network interface\n");
2133
2698
exitcode = EXIT_FAILURE;
2134
2699
goto end;
2135
2700
}
2136
2701
}
2137
2702
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2703
/* Bring up interfaces which are down, and remove any "none"s */
2704
{
2150
2705
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2706
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2152
2707
interface))){
2708
/* If interface name is "none", stop bringing up interfaces.
2709
Also remove all instances of "none" from the list */
2710
if(strcmp(interface, "none") == 0){
2711
argz_delete(&mc.interfaces, &mc.interfaces_size,
2712
interface);
2713
interface = NULL;
2714
while((interface = argz_next(mc.interfaces,
2715
mc.interfaces_size, interface))){
2716
if(strcmp(interface, "none") == 0){
2717
argz_delete(&mc.interfaces, &mc.interfaces_size,
2718
interface);
2719
interface = NULL;
2720
}
2721
}
2722
break;
2723
}
2153
2724
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2725
errno = bring_up_interface(interface, delay);
2155
2726
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2727
if(errno != 0){
2158
2728
perror_plus("Failed to bring up interface");
2159
2729
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2730
errno = argz_add(&interfaces_to_take_down,
2731
&interfaces_to_take_down_size,
2732
interface);
2733
if(errno != 0){
2734
perror_plus("argz_add");
2735
}
2163
2736
}
2164
2737
}
2165
2738
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
2739
if(debug and (interfaces_to_take_down == NULL)){
2170
2740
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
2741
}
2172
2742
}
2173
2743
2744
/* If we only got one interface, explicitly use only that one */
2745
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2746
if(debug){
2747
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2748
mc.interfaces);
2749
}
2750
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2751
}
2752
2174
2753
if(quit_now){
2175
2754
goto end;
2176
2755
}
2177
2756
2178
ret = init_gnutls_global(pubkey, seckey);
2757
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2179
2758
if(ret == -1){
2180
2759
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
2760
exitcode = EX_UNAVAILABLE;
2188
2767
goto end;
2189
2768
}
2190
2769
2191
if(mkdtemp(tempdir) == NULL){
2770
/* Try /run/tmp before /tmp */
2771
tempdir = mkdtemp(run_tempdir);
2772
if(tempdir == NULL and errno == ENOENT){
2773
if(debug){
2774
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2775
run_tempdir, old_tempdir);
2776
}
2777
tempdir = mkdtemp(old_tempdir);
2778
}
2779
if(tempdir == NULL){
2192
2780
perror_plus("mkdtemp");
2193
2781
goto end;
2194
2782
}
2195
tempdir_created = true;
2196
2783
2197
2784
if(quit_now){
2198
2785
goto end;
2199
2786
}
2200
2787
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2788
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2202
2789
fprintf_plus(stderr, "init_gpgme failed\n");
2203
2790
exitcode = EX_UNAVAILABLE;
2204
2791
goto end;
2225
2812
goto end;
2226
2813
}
2227
2814
2228
uint16_t port;
2815
in_port_t port;
2229
2816
errno = 0;
2230
2817
tmpmax = strtoimax(address+1, &tmp, 10);
2231
2818
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
or tmpmax != (uint16_t)tmpmax){
2819
or tmpmax != (in_port_t)tmpmax){
2233
2820
fprintf_plus(stderr, "Bad port number\n");
2234
2821
exitcode = EX_USAGE;
2235
2822
goto end;
2236
2823
}
2237
2824
2238
2825
if(quit_now){
2239
2826
goto end;
2240
2827
}
2241
2828
2242
port = (uint16_t)tmpmax;
2829
port = (in_port_t)tmpmax;
2243
2830
*address = '\0';
2244
2831
/* Colon in address indicates IPv6 */
2245
2832
int af;
2261
2848
}
2262
2849
2263
2850
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2851
ret = start_mandos_communication(address, port, if_index, af,
2852
&mc);
2265
2853
if(quit_now or ret == 0){
2266
2854
break;
2267
2855
}
2269
2857
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
2858
(int)retry_interval);
2271
2859
}
2272
sleep((int)retry_interval);
2860
sleep((unsigned int)retry_interval);
2273
2861
}
2274
2862
2275
if (not quit_now){
2863
if(not quit_now){
2276
2864
exitcode = EXIT_SUCCESS;
2277
2865
}
2278
2866
2293
2881
config.publish_domain = 0;
2294
2882
2295
2883
/* Allocate a new server */
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2884
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2885
&config, NULL, NULL, &ret_errno);
2299
2886
2300
2887
/* Free the Avahi configuration data */
2301
2888
avahi_server_config_free(&config);
2316
2903
/* Create the Avahi service browser */
2317
2904
sb = avahi_s_service_browser_new(mc.server, if_index,
2318
2905
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
NULL, 0, browse_callback, NULL);
2906
NULL, 0, browse_callback,
2907
(void *)&mc);
2320
2908
if(sb == NULL){
2321
2909
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
2910
avahi_strerror(avahi_server_errno(mc.server)));
2333
2921
if(debug){
2334
2922
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
2923
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2924
2925
ret = avahi_loop_with_timeout(simple_poll,
2926
(int)(retry_interval * 1000), &mc);
2339
2927
if(debug){
2340
2928
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
2929
(ret == 0) ? "successfully" : "with error");
2348
2936
}
2349
2937
2350
2938
/* Cleanup things */
2939
free(mc.interfaces);
2940
2351
2941
if(sb != NULL)
2352
2942
avahi_s_service_browser_free(sb);
2353
2943
2354
2944
if(mc.server != NULL)
2355
2945
avahi_server_free(mc.server);
2356
2946
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2947
if(simple_poll != NULL)
2948
avahi_simple_poll_free(simple_poll);
2359
2949
2360
2950
if(gnutls_initialized){
2361
2951
gnutls_certificate_free_credentials(mc.cred);
2373
2963
mc.current_server->prev->next = NULL;
2374
2964
while(mc.current_server != NULL){
2375
2965
server *next = mc.current_server->next;
2966
#ifdef __GNUC__
2967
#pragma GCC diagnostic push
2968
#pragma GCC diagnostic ignored "-Wcast-qual"
2969
#endif
2970
free((char *)(mc.current_server->ip));
2971
#ifdef __GNUC__
2972
#pragma GCC diagnostic pop
2973
#endif
2376
2974
free(mc.current_server);
2377
2975
mc.current_server = next;
2378
2976
}
2379
2977
}
2380
2978
2381
/* Re-raise priviliges */
2979
/* Re-raise privileges */
2382
2980
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2981
ret_errno = raise_privileges();
2982
if(ret_errno != 0){
2983
errno = ret_errno;
2984
perror_plus("Failed to raise privileges");
2985
} else {
2986
2987
/* Run network hooks */
2988
run_network_hooks("stop", interfaces_hooks != NULL ?
2989
interfaces_hooks : "", delay);
2990
2991
/* Take down the network interfaces which were brought up */
2992
{
2993
char *interface = NULL;
2994
while((interface=argz_next(interfaces_to_take_down,
2995
interfaces_to_take_down_size,
2996
interface))){
2997
ret_errno = take_down_interface(interface);
2998
if(ret_errno != 0){
2999
errno = ret_errno;
3000
perror_plus("Failed to take down interface");
3001
}
3002
}
3003
if(debug and (interfaces_to_take_down == NULL)){
3004
fprintf_plus(stderr, "No interfaces needed to be taken"
3005
" down\n");
3006
}
3007
}
3008
}
3009
3010
ret_errno = lower_privileges_permanently();
3011
if(ret_errno != 0){
3012
errno = ret_errno;
3013
perror_plus("Failed to lower privileges permanently");
3014
}
2407
3015
}
2408
3016
2409
3017
free(interfaces_to_take_down);
2410
3018
free(interfaces_hooks);
2411
3019
2412
3020
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
3021
if(tempdir != NULL){
2414
3022
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
3023
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3024
| O_NOFOLLOW
3025
| O_DIRECTORY
3026
| O_PATH));
3027
if(tempdir_fd == -1){
3028
perror_plus("open");
3029
} else {
3030
#ifdef __GLIBC__
3031
#if __GLIBC_PREREQ(2, 15)
3032
int numentries = scandirat(tempdir_fd, ".", &direntries,
3033
notdotentries, alphasort);
3034
#else /* not __GLIBC_PREREQ(2, 15) */
3035
int numentries = scandir(tempdir, &direntries, notdotentries,
3036
alphasort);
3037
#endif /* not __GLIBC_PREREQ(2, 15) */
3038
#else /* not __GLIBC__ */
3039
int numentries = scandir(tempdir, &direntries, notdotentries,
3040
alphasort);
3041
#endif /* not __GLIBC__ */
3042
if(numentries >= 0){
3043
for(int i = 0; i < numentries; i++){
3044
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3045
if(ret == -1){
3046
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3047
" \"%s\", 0): %s\n", tempdir,
3048
direntries[i]->d_name, strerror(errno));
3049
}
3050
free(direntries[i]);
3051
}
3052
3053
/* need to clean even if 0 because man page doesn't specify */
3054
free(direntries);
3055
if(numentries == -1){
3056
perror_plus("scandir");
3057
}
3058
ret = rmdir(tempdir);
3059
if(ret == -1 and errno != ENOENT){
3060
perror_plus("rmdir");
3061
}
2434
3062
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
3063
TEMP_FAILURE_RETRY(close(tempdir_fd));
2445
3064
}
2446
3065
}
2447
3066
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0