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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- files removed:
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
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(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
93
91
argz_delete(), argz_append(),
94
92
argz_stringify(), argz_add(),
95
93
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
94
99
95
#ifdef __linux__
100
96
#include <sys/klog.h> /* klogctl() */
142
138
static const char sys_class_net[] = "/sys/class/net";
143
139
char *connect_to = NULL;
144
140
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
141
uid_t uid = 65534;
147
142
gid_t gid = 65534;
148
143
159
154
160
155
/* Used for passing in values through the Avahi callback functions */
161
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
162
158
AvahiServer *server;
163
159
gnutls_certificate_credentials_t cred;
164
160
unsigned int dh_bits;
166
162
const char *priority;
167
163
gpgme_ctx_t ctx;
168
164
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
165
} mandos_context;
172
166
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
175
172
176
173
sig_atomic_t quit_now = 0;
177
174
int signal_received = 0;
185
182
perror(print_text);
186
183
}
187
184
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
189
186
int fprintf_plus(FILE *stream, const char *format, ...){
190
187
va_list ap;
191
188
va_start (ap, format);
192
189
193
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
191
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
193
}
197
194
198
195
/*
200
197
* bytes. "buffer_capacity" is how much is currently allocated,
201
198
* "buffer_length" is how much is already used.
202
199
*/
203
__attribute__((nonnull, warn_unused_result))
204
200
size_t incbuffer(char **buffer, size_t buffer_length,
205
201
size_t buffer_capacity){
206
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
213
205
return 0;
214
206
}
215
*buffer = new_buf;
216
207
buffer_capacity += BUFFER_SIZE;
217
208
}
218
209
return buffer_capacity;
219
210
}
220
211
221
212
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
214
int af){
225
215
int ret;
226
216
server *new_server = malloc(sizeof(server));
227
217
if(new_server == NULL){
234
224
.af = af };
235
225
if(new_server->ip == NULL){
236
226
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
227
return false;
253
228
}
254
229
/* Special case of first server */
255
if(*current_server == NULL){
230
if (mc.current_server == NULL){
256
231
new_server->next = new_server;
257
232
new_server->prev = new_server;
258
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
259
235
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
263
238
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
265
245
}
266
246
return true;
267
247
}
269
249
/*
270
250
* Initialize GPGME.
271
251
*/
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){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
277
254
gpgme_error_t rc;
278
255
gpgme_engine_info_t engine_info;
279
256
257
280
258
/*
281
259
* Helper function to insert pub and seckey to the engine keyring.
282
260
*/
283
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
284
262
int ret;
285
263
int fd;
286
264
gpgme_data_t pgp_data;
298
276
return false;
299
277
}
300
278
301
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
302
280
if(rc != GPG_ERR_NO_ERROR){
303
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
282
gpgme_strsource(rc), gpgme_strerror(rc));
305
283
return false;
306
284
}
307
285
308
ret = close(fd);
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
287
if(ret == -1){
310
288
perror_plus("close");
311
289
}
348
326
}
349
327
350
328
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
352
330
if(rc != GPG_ERR_NO_ERROR){
353
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
345
* Decrypt OpenPGP data.
368
346
* Returns -1 on error
369
347
*/
370
__attribute__((nonnull, warn_unused_result))
371
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
349
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
350
char **plaintext){
375
351
gpgme_data_t dh_crypto, dh_plain;
376
352
gpgme_error_t rc;
377
353
ssize_t ret;
403
379
404
380
/* Decrypt data from the cryptotext data buffer to the plaintext
405
381
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
383
if(rc != GPG_ERR_NO_ERROR){
408
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
385
gpgme_strsource(rc), gpgme_strerror(rc));
410
386
plaintext_length = -1;
411
387
if(debug){
412
388
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
414
390
if(result == NULL){
415
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
392
} else {
493
469
return plaintext_length;
494
470
}
495
471
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){
472
static const char * safer_gnutls_strerror(int value){
505
473
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
507
477
}
508
478
509
479
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
480
static void debuggnutls(__attribute__((unused)) int level,
512
481
const char* string){
513
482
fprintf_plus(stderr, "GnuTLS: %s", string);
514
483
}
515
484
516
__attribute__((nonnull, warn_unused_result))
517
485
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
486
const char *seckeyfilename){
521
487
int ret;
522
unsigned int uret;
523
488
524
489
if(debug){
525
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
541
506
}
542
507
543
508
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
510
if(ret != GNUTLS_E_SUCCESS){
546
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
512
safer_gnutls_strerror(ret));
557
522
}
558
523
559
524
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
561
526
GNUTLS_OPENPGP_FMT_BASE64);
562
527
if(ret != GNUTLS_E_SUCCESS){
563
528
fprintf_plus(stderr,
569
534
}
570
535
571
536
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
573
538
if(ret != GNUTLS_E_SUCCESS){
574
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
540
" initialization: %s\n",
576
541
safer_gnutls_strerror(ret));
577
542
goto globalfail;
578
543
}
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);
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
552
753
553
return 0;
754
554
755
555
globalfail:
756
556
757
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_certificate_free_credentials(mc.cred);
758
558
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
559
gnutls_dh_params_deinit(mc.dh_params);
760
560
return -1;
761
561
}
762
562
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
766
564
int ret;
767
565
/* GnuTLS session creation */
768
566
do {
780
578
{
781
579
const char *err;
782
580
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
582
if(quit_now){
785
583
gnutls_deinit(*session);
786
584
return -1;
797
595
798
596
do {
799
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
598
mc.cred);
801
599
if(quit_now){
802
600
gnutls_deinit(*session);
803
601
return -1;
813
611
/* ignore client certificate if any. */
814
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
613
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
816
616
return 0;
817
617
}
818
618
820
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
621
__attribute__((unused)) const char *txt){}
822
622
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 = 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
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
1041
623
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
624
static int start_mandos_communication(const char *ip, in_port_t port,
1044
625
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
626
int af){
1046
627
int ret, tcp_sd = -1;
1047
628
ssize_t sret;
1048
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1049
633
char *buffer = NULL;
1050
634
char *decrypted_buffer = NULL;
1051
635
size_t buffer_length = 0;
1054
638
int retval = -1;
1055
639
gnutls_session_t session;
1056
640
int pf; /* Protocol family */
1057
bool route_added = false;
1058
641
1059
642
errno = 0;
1060
643
1076
659
return -1;
1077
660
}
1078
661
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
1112
663
if(ret != 0){
1113
664
return -1;
1114
665
}
1118
669
PRIuMAX "\n", ip, (uintmax_t)port);
1119
670
}
1120
671
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
673
if(tcp_sd < 0){
1123
674
int e = errno;
1124
675
perror_plus("socket");
1131
682
goto mandos_end;
1132
683
}
1133
684
685
memset(&to, 0, sizeof(to));
1134
686
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
689
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
692
}
1143
693
if(ret < 0 ){
1144
694
int e = errno;
1153
703
goto mandos_end;
1154
704
}
1155
705
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1159
710
if(if_index == AVAHI_IF_UNSPEC){
1160
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
712
" incomplete without a network interface\n");
1163
714
goto mandos_end;
1164
715
}
1165
716
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
718
}
1168
719
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1170
723
}
1171
724
1172
725
if(quit_now){
1189
742
}
1190
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1272
784
}
1273
785
1274
786
const char *out = mandos_protocol_version;
1425
937
if(buffer_length > 0){
1426
938
ssize_t decrypted_buffer_size;
1427
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
940
&decrypted_buffer);
1429
941
if(decrypted_buffer_size >= 0){
1430
942
1431
943
written = 0;
1457
969
1458
970
mandos_end:
1459
971
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
972
int e = errno;
1467
973
free(decrypted_buffer);
1468
974
free(buffer);
1469
975
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
977
}
1472
978
if(ret == -1){
1473
979
if(e == 0){
1485
991
return retval;
1486
992
}
1487
993
1488
__attribute__((nonnull))
1489
994
static void resolve_callback(AvahiSServiceResolver *r,
1490
995
AvahiIfIndex interface,
1491
996
AvahiProtocol proto,
1499
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
1006
flags,
1502
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1503
1008
if(r == NULL){
1504
1009
return;
1505
1010
}
1508
1013
timed out */
1509
1014
1510
1015
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1016
return;
1513
1017
}
1514
1018
1518
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
1024
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1523
1026
break;
1524
1027
1525
1028
case AVAHI_RESOLVER_FOUND:
1533
1036
}
1534
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
1038
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1039
avahi_proto_to_af(proto));
1538
1040
if(ret == 0){
1539
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1540
1042
} else {
1541
1043
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1544
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
1046
" list\n", name);
1546
1047
}
1559
1060
const char *domain,
1560
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1062
flags,
1562
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1563
1064
if(b == NULL){
1564
1065
return;
1565
1066
}
1576
1077
case AVAHI_BROWSER_FAILURE:
1577
1078
1578
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1582
1082
return;
1583
1083
1584
1084
case AVAHI_BROWSER_NEW:
1587
1087
the callback function is called the Avahi server will free the
1588
1088
resolver for us. */
1589
1089
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1594
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
1094
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1598
1096
break;
1599
1097
1600
1098
case AVAHI_BROWSER_REMOVE:
1619
1117
signal_received = sig;
1620
1118
int old_errno = errno;
1621
1119
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1624
1122
}
1625
1123
errno = old_errno;
1626
1124
}
1627
1125
1628
__attribute__((nonnull, warn_unused_result))
1629
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1127
int ret;
1631
1128
error_t ret_errno;
1650
1147
return true;
1651
1148
}
1652
1149
1653
__attribute__((nonnull, warn_unused_result))
1654
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
1151
1656
1152
/* Reject the loopback device */
1698
1194
* corresponds to an acceptable network device.
1699
1195
* (This function is passed to scandir(3) as a filter function.)
1700
1196
*/
1701
__attribute__((nonnull, warn_unused_result))
1702
1197
int good_interface(const struct dirent *if_entry){
1703
1198
if(if_entry->d_name[0] == '.'){
1704
1199
return 0;
1722
1217
/*
1723
1218
* This function determines if a network interface is up.
1724
1219
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
1220
bool interface_is_up(const char *interface){
1727
1221
struct ifreq ifr;
1728
1222
if(not get_flags(interface, &ifr)){
1739
1233
/*
1740
1234
* This function determines if a network interface is running
1741
1235
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
1236
bool interface_is_running(const char *interface){
1744
1237
struct ifreq ifr;
1745
1238
if(not get_flags(interface, &ifr)){
1753
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
1247
}
1755
1248
1756
__attribute__((nonnull, pure, warn_unused_result))
1757
1249
int notdotentries(const struct dirent *direntry){
1758
1250
/* Skip "." and ".." */
1759
1251
if(direntry->d_name[0] == '.'
1766
1258
}
1767
1259
1768
1260
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
1261
int runnable_hook(const struct dirent *direntry){
1771
1262
int ret;
1772
1263
size_t sret;
1780
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
1272
"abcdefghijklmnopqrstuvwxyz"
1782
1273
"0123456789"
1783
"_.-");
1274
"_-");
1784
1275
if((direntry->d_name)[sret] != '\0'){
1785
1276
/* Contains non-allowed characters */
1786
1277
if(debug){
1790
1281
return 0;
1791
1282
}
1792
1283
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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);
1794
1292
if(ret == -1){
1795
1293
if(debug){
1796
1294
perror_plus("Could not stat hook");
1820
1318
return 1;
1821
1319
}
1822
1320
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1826
1322
int ret;
1827
1323
struct timespec now;
1828
1324
struct timespec waited_time;
1829
1325
intmax_t block_time;
1830
1326
1831
1327
while(true){
1832
if(mc->current_server == NULL){
1833
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1834
1330
fprintf_plus(stderr, "Wait until first server is found."
1835
1331
" No timeout!\n");
1836
1332
}
1837
1333
ret = avahi_simple_poll_iterate(s, -1);
1838
1334
} else {
1839
if(debug){
1335
if (debug){
1840
1336
fprintf_plus(stderr, "Check current_server if we should run"
1841
1337
" it, or wait\n");
1842
1338
}
1849
1345
/* Calculating in ms how long time between now and server
1850
1346
who we visted longest time ago. Now - last seen. */
1851
1347
waited_time.tv_sec = (now.tv_sec
1852
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1853
1349
waited_time.tv_nsec = (now.tv_nsec
1854
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1855
1351
/* total time is 10s/10,000ms.
1856
1352
Converting to s from ms by dividing by 1,000,
1857
1353
and ns to ms by dividing by 1,000,000. */
1859
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1860
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
1357
1862
if(debug){
1358
if (debug){
1863
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
1360
block_time);
1865
1361
}
1866
1362
1867
1363
if(block_time <= 0){
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
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);
1872
1368
if(ret == 0){
1873
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1874
1370
return 0;
1875
1371
}
1876
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1877
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1878
1374
if(ret == -1){
1879
1375
perror_plus("clock_gettime");
1880
1376
return -1;
1881
1377
}
1882
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1883
1379
block_time = 0; /* Call avahi to find new Mandos
1884
1380
servers, but don't block */
1885
1381
}
1887
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
1384
}
1889
1385
if(ret != 0){
1890
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1891
1387
return (ret != 1) ? ret : 0;
1892
1388
}
1893
1389
}
1894
1390
}
1895
1391
}
1896
1392
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
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,
1899
1446
const float delay){
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1928
1452
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1944
1460
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1991
1468
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1996
1527
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
2065
1539
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
2085
1576
}
2086
1577
2087
__attribute__((nonnull, warn_unused_result))
2088
1578
error_t bring_up_interface(const char *const interface,
2089
1579
const float delay){
1580
int sd = -1;
2090
1581
error_t old_errno = errno;
2091
int ret;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2092
1584
struct ifreq network;
2093
1585
unsigned int if_index = if_nametoindex(interface);
2094
1586
if(if_index == 0){
2103
1595
}
2104
1596
2105
1597
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
1598
if(not get_flags(interface, &network) and debug){
2108
1599
ret_errno = errno;
2109
1600
fprintf_plus(stderr, "Failed to get flags for interface "
2110
1601
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
1602
return ret_errno;
2113
1603
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
1604
network.ifr_flags |= IFF_UP;
2115
1605
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2118
1608
ret_errno = errno;
2119
1609
perror_plus("socket");
2120
1610
errno = old_errno;
2121
1611
return ret_errno;
2122
1612
}
2123
1613
2124
1614
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
1615
close(sd);
2129
1616
errno = old_errno;
2130
1617
return EINTR;
2131
1618
}
2135
1622
interface);
2136
1623
}
2137
1624
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
1625
/* Raise priviliges */
1626
raise_privileges();
2144
1627
2145
1628
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
2157
1636
}
2158
1637
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2161
1640
#ifdef __linux__
2162
1641
if(restore_loglevel){
2163
1642
ret_linux = klogctl(7, NULL, 0);
2167
1646
}
2168
1647
#endif /* __linux__ */
2169
1648
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
1649
/* Lower privileges */
1650
lower_privileges();
2179
1651
2180
1652
/* Close the socket */
2181
ret = close(sd);
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
1654
if(ret == -1){
2183
1655
perror_plus("close");
2184
1656
}
2185
1657
2186
1658
if(ret_setflags == -1){
2187
errno = ioctl_errno;
1659
errno = ret_errno;
2188
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
1661
errno = old_errno;
2190
return ioctl_errno;
1662
return ret_errno;
2191
1663
}
2192
1664
} else if(debug){
2193
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2211
1683
return 0;
2212
1684
}
2213
1685
2214
__attribute__((nonnull, warn_unused_result))
2215
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
2216
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2217
1691
struct ifreq network;
2218
1692
unsigned int if_index = if_nametoindex(interface);
2219
1693
if(if_index == 0){
2222
1696
return ENXIO;
2223
1697
}
2224
1698
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
1699
if(not get_flags(interface, &network) and debug){
2227
1700
ret_errno = errno;
2228
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2229
1702
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
1703
return ret_errno;
2232
1704
}
2233
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
1706
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2237
1709
ret_errno = errno;
2238
1710
perror_plus("socket");
2239
1711
errno = old_errno;
2245
1717
interface);
2246
1718
}
2247
1719
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
2267
1728
2268
1729
/* Close the socket */
2269
int ret = close(sd);
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1731
if(ret == -1){
2271
1732
perror_plus("close");
2272
1733
}
2273
1734
2274
1735
if(ret_setflags == -1){
2275
errno = ioctl_errno;
1736
errno = ret_errno;
2276
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
1738
errno = old_errno;
2278
return ioctl_errno;
1739
return ret_errno;
2279
1740
}
2280
1741
} else if(debug){
2281
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2287
1748
}
2288
1749
2289
1750
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
1751
AvahiSServiceBrowser *sb = NULL;
2296
1752
error_t ret_errno;
2297
1753
int ret;
2298
1754
intmax_t tmpmax;
2299
1755
char *tmp;
2300
1756
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
2301
1759
char *interfaces_to_take_down = NULL;
2302
1760
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2306
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1764
const char *seckey = PATHDIR "/" SECKEY;
2308
1765
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
2311
1768
2312
1769
bool gnutls_initialized = false;
2313
1770
bool gpgme_initialized = false;
2365
1822
.doc = "Bit length of the prime number used in the"
2366
1823
" Diffie-Hellman key exchange",
2367
1824
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1825
{ .name = "priority", .key = 130,
2374
1826
.arg = "STRING",
2375
1827
.doc = "GnuTLS priority string for the TLS handshake",
2409
1861
connect_to = arg;
2410
1862
break;
2411
1863
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2414
1866
if(ret_errno != 0){
2415
1867
argp_error(state, "%s", strerror(ret_errno));
2416
1868
}
2430
1882
}
2431
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1884
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1885
case 130: /* --priority */
2437
1886
mc.priority = arg;
2438
1887
break;
2494
1943
goto end;
2495
1944
}
2496
1945
}
2497
1946
2498
1947
{
2499
1948
/* Work around Debian bug #633582:
2500
1949
<http://bugs.debian.org/633582> */
2501
1950
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
2507
} else {
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2508
1953
struct stat st;
2509
1954
2510
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2524
1969
}
2525
1970
}
2526
1971
}
2527
close(seckey_fd);
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
1973
}
2529
1974
}
2530
1975
2531
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
1977
int pubkey_fd = open(pubkey, O_RDONLY);
2533
1978
if(pubkey_fd == -1){
2545
1990
}
2546
1991
}
2547
1992
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
2574
1997
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2579
2002
}
2580
2003
}
2581
2004
}
2582
2005
2583
/* Remove invalid interface names (except "none") */
2006
/* Remove empty interface names */
2584
2007
{
2585
2008
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2009
while((interface = argz_next(interfaces, interfaces_size,
2587
2010
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2591
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2592
2014
" \"%s\"\n", interface);
2593
2015
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2016
argz_delete(&interfaces, &interfaces_size, interface);
2595
2017
interface = NULL;
2596
2018
}
2597
2019
}
2599
2021
2600
2022
/* Run network hooks */
2601
2023
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2604
2027
if(interfaces_hooks == NULL){
2605
2028
perror_plus("malloc");
2606
2029
goto end;
2607
2030
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2613
2040
}
2614
2041
2615
2042
if(not debug){
2620
2047
from the signal handler */
2621
2048
/* Initialize the pseudo-RNG for Avahi */
2622
2049
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2625
2052
fprintf_plus(stderr,
2626
2053
"Avahi: Failed to create simple poll object.\n");
2627
2054
exitcode = EX_UNAVAILABLE;
2692
2119
}
2693
2120
2694
2121
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2697
2124
/* Look for any good interfaces */
2698
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2699
2126
alphasort);
2700
2127
if(ret >= 1){
2701
2128
/* Add all found interfaces to interfaces list */
2702
2129
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2704
2131
direntries[i]->d_name);
2705
2132
if(ret_errno != 0){
2706
errno = ret_errno;
2707
2133
perror_plus("argz_add");
2708
free(direntries[i]);
2709
2134
continue;
2710
2135
}
2711
2136
if(debug){
2712
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
2138
direntries[i]->d_name);
2714
2139
}
2715
free(direntries[i]);
2716
2140
}
2717
2141
free(direntries);
2718
2142
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2143
free(direntries);
2722
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2723
2145
exitcode = EXIT_FAILURE;
2724
2146
goto end;
2725
2147
}
2726
2148
}
2727
2149
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2730
2162
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
while((interface = argz_next(interfaces, interfaces_size,
2732
2164
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
2165
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2166
ret = bring_up_interface(interface, delay);
2751
2167
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2755
2171
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2762
2175
}
2763
2176
}
2764
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2765
2181
if(debug and (interfaces_to_take_down == NULL)){
2766
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
2183
}
2768
2184
}
2769
2185
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2777
}
2778
2779
2186
if(quit_now){
2780
2187
goto end;
2781
2188
}
2782
2189
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2190
ret = init_gnutls_global(pubkey, seckey);
2784
2191
if(ret == -1){
2785
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
2193
exitcode = EX_UNAVAILABLE;
2793
2200
goto end;
2794
2201
}
2795
2202
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2203
if(mkdtemp(tempdir) == NULL){
2806
2204
perror_plus("mkdtemp");
2807
2205
goto end;
2808
2206
}
2207
tempdir_created = true;
2809
2208
2810
2209
if(quit_now){
2811
2210
goto end;
2812
2211
}
2813
2212
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2816
2215
exitcode = EX_UNAVAILABLE;
2817
2216
goto end;
2847
2246
exitcode = EX_USAGE;
2848
2247
goto end;
2849
2248
}
2850
2249
2851
2250
if(quit_now){
2852
2251
goto end;
2853
2252
}
2874
2273
}
2875
2274
2876
2275
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2276
ret = start_mandos_communication(address, port, if_index, af);
2879
2277
if(quit_now or ret == 0){
2880
2278
break;
2881
2279
}
2883
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
2282
(int)retry_interval);
2885
2283
}
2886
sleep((unsigned int)retry_interval);
2284
sleep((int)retry_interval);
2887
2285
}
2888
2286
2889
if(not quit_now){
2287
if (not quit_now){
2890
2288
exitcode = EXIT_SUCCESS;
2891
2289
}
2892
2290
2907
2305
config.publish_domain = 0;
2908
2306
2909
2307
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
2912
2311
2913
2312
/* Free the Avahi configuration data */
2914
2313
avahi_server_config_free(&config);
2929
2328
/* Create the Avahi service browser */
2930
2329
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2331
NULL, 0, browse_callback, NULL);
2934
2332
if(sb == NULL){
2935
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
2334
avahi_strerror(avahi_server_errno(mc.server)));
2947
2345
if(debug){
2948
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
2347
}
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2953
2351
if(debug){
2954
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
2353
(ret == 0) ? "successfully" : "with error");
2962
2360
}
2963
2361
2964
2362
/* Cleanup things */
2965
free(mc.interfaces);
2966
2967
2363
if(sb != NULL)
2968
2364
avahi_s_service_browser_free(sb);
2969
2365
2970
2366
if(mc.server != NULL)
2971
2367
avahi_server_free(mc.server);
2972
2368
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
2975
2371
2976
2372
if(gnutls_initialized){
2977
2373
gnutls_certificate_free_credentials(mc.cred);
2989
2385
mc.current_server->prev->next = NULL;
2990
2386
while(mc.current_server != NULL){
2991
2387
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
3000
2388
free(mc.current_server);
3001
2389
mc.current_server = next;
3002
2390
}
3003
2391
}
3004
2392
3005
/* Re-raise privileges */
2393
/* Re-raise priviliges */
3006
2394
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
3034
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
3040
}
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
3041
2420
}
3042
2421
3043
2422
free(interfaces_to_take_down);
3044
2423
free(interfaces_hooks);
3045
2424
3046
2425
/* Removes the GPGME temp directory and all files inside */
3047
if(tempdir != NULL){
2426
if(tempdir_created){
3048
2427
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
3088
2447
}
3089
close(tempdir_fd);
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
3090
2458
}
3091
2459
}
3092
2460
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0