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- Committer: Teddy Hogeborn
- Date: 2016-02-28 14:34:45 UTC
- mfrom: (237.7.356 trunk)
- Revision ID: teddy@recompile.se-20160228143445-bbhvlujl07q5mrd1
Merge from trunk.
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
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
#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,
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
91
93
argz_delete(), argz_append(),
92
94
argz_stringify(), argz_add(),
93
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
94
98
95
99
#ifdef __linux__
96
100
#include <sys/klog.h> /* klogctl() */
138
142
static const char sys_class_net[] = "/sys/class/net";
139
143
char *connect_to = NULL;
140
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
141
146
uid_t uid = 65534;
142
147
gid_t gid = 65534;
143
148
161
166
const char *priority;
162
167
gpgme_ctx_t ctx;
163
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
164
171
} mandos_context;
165
172
166
173
/* global so signal handler can reach it*/
167
174
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
175
172
176
sig_atomic_t quit_now = 0;
173
177
int signal_received = 0;
181
185
perror(print_text);
182
186
}
183
187
184
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
189
int fprintf_plus(FILE *stream, const char *format, ...){
186
190
va_list ap;
187
191
va_start (ap, format);
188
192
189
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
194
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
196
}
193
197
194
198
/*
196
200
* bytes. "buffer_capacity" is how much is currently allocated,
197
201
* "buffer_length" is how much is already used.
198
202
*/
203
__attribute__((nonnull, warn_unused_result))
199
204
size_t incbuffer(char **buffer, size_t buffer_length,
200
205
size_t buffer_capacity){
201
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
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;
204
213
return 0;
205
214
}
215
*buffer = new_buf;
206
216
buffer_capacity += BUFFER_SIZE;
207
217
}
208
218
return buffer_capacity;
209
219
}
210
220
211
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
212
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
224
int af, server **current_server){
214
225
int ret;
215
226
server *new_server = malloc(sizeof(server));
216
227
if(new_server == NULL){
223
234
.af = af };
224
235
if(new_server->ip == NULL){
225
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);
226
252
return false;
227
253
}
228
254
/* Special case of first server */
229
if (mc.current_server == NULL){
255
if(*current_server == NULL){
230
256
new_server->next = new_server;
231
257
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
258
*current_server = new_server;
234
259
} else {
235
new_server->next = mc.current_server;
236
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;
237
263
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
264
(*current_server)->prev = new_server;
244
265
}
245
266
return true;
246
267
}
248
269
/*
249
270
* Initialize GPGME.
250
271
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
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){
253
277
gpgme_error_t rc;
254
278
gpgme_engine_info_t engine_info;
255
279
256
280
/*
257
281
* Helper function to insert pub and seckey to the engine keyring.
258
282
*/
259
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
260
284
int ret;
261
285
int fd;
262
286
gpgme_data_t pgp_data;
274
298
return false;
275
299
}
276
300
277
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
278
302
if(rc != GPG_ERR_NO_ERROR){
279
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
304
gpgme_strsource(rc), gpgme_strerror(rc));
281
305
return false;
282
306
}
283
307
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
285
309
if(ret == -1){
286
310
perror_plus("close");
287
311
}
324
348
}
325
349
326
350
/* Create new GPGME "context" */
327
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
328
352
if(rc != GPG_ERR_NO_ERROR){
329
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
367
* Decrypt OpenPGP data.
344
368
* Returns -1 on error
345
369
*/
370
__attribute__((nonnull, warn_unused_result))
346
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
347
372
size_t crypto_size,
348
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
349
375
gpgme_data_t dh_crypto, dh_plain;
350
376
gpgme_error_t rc;
351
377
ssize_t ret;
377
403
378
404
/* Decrypt data from the cryptotext data buffer to the plaintext
379
405
data buffer */
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
407
if(rc != GPG_ERR_NO_ERROR){
382
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
409
gpgme_strsource(rc), gpgme_strerror(rc));
384
410
plaintext_length = -1;
385
411
if(debug){
386
412
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
388
414
if(result == NULL){
389
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
416
} else {
467
493
return plaintext_length;
468
494
}
469
495
470
static const char * safer_gnutls_strerror(int value){
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){
471
505
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
506
return safe_string(ret);
475
507
}
476
508
477
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
478
511
static void debuggnutls(__attribute__((unused)) int level,
479
512
const char* string){
480
513
fprintf_plus(stderr, "GnuTLS: %s", string);
481
514
}
482
515
516
__attribute__((nonnull, warn_unused_result))
483
517
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
485
521
int ret;
522
unsigned int uret;
486
523
487
524
if(debug){
488
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
504
541
}
505
542
506
543
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
508
545
if(ret != GNUTLS_E_SUCCESS){
509
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
547
safer_gnutls_strerror(ret));
520
557
}
521
558
522
559
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
524
561
GNUTLS_OPENPGP_FMT_BASE64);
525
562
if(ret != GNUTLS_E_SUCCESS){
526
563
fprintf_plus(stderr,
532
569
}
533
570
534
571
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
536
573
if(ret != GNUTLS_E_SUCCESS){
537
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
575
" initialization: %s\n",
539
576
safer_gnutls_strerror(ret));
540
577
goto globalfail;
541
578
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
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);
550
752
551
753
return 0;
552
754
553
755
globalfail:
554
756
555
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
556
758
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
558
760
return -1;
559
761
}
560
762
561
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){
562
766
int ret;
563
767
/* GnuTLS session creation */
564
768
do {
576
780
{
577
781
const char *err;
578
782
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
784
if(quit_now){
581
785
gnutls_deinit(*session);
582
786
return -1;
593
797
594
798
do {
595
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
800
mc->cred);
597
801
if(quit_now){
598
802
gnutls_deinit(*session);
599
803
return -1;
609
813
/* ignore client certificate if any. */
610
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
815
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
816
return 0;
615
817
}
616
818
618
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
821
__attribute__((unused)) const char *txt){}
620
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 = 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
621
1041
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
622
1043
static int start_mandos_communication(const char *ip, in_port_t port,
623
1044
AvahiIfIndex if_index,
624
int af){
1045
int af, mandos_context *mc){
625
1046
int ret, tcp_sd = -1;
626
1047
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1048
struct sockaddr_storage to;
631
1049
char *buffer = NULL;
632
1050
char *decrypted_buffer = NULL;
633
1051
size_t buffer_length = 0;
636
1054
int retval = -1;
637
1055
gnutls_session_t session;
638
1056
int pf; /* Protocol family */
1057
bool route_added = false;
639
1058
640
1059
errno = 0;
641
1060
657
1076
return -1;
658
1077
}
659
1078
660
ret = init_gnutls_session(&session);
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);
661
1112
if(ret != 0){
662
1113
return -1;
663
1114
}
667
1118
PRIuMAX "\n", ip, (uintmax_t)port);
668
1119
}
669
1120
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1122
if(tcp_sd < 0){
672
1123
int e = errno;
673
1124
perror_plus("socket");
680
1131
goto mandos_end;
681
1132
}
682
1133
683
memset(&to, 0, sizeof(to));
684
1134
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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
1138
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
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
1142
}
691
1143
if(ret < 0 ){
692
1144
int e = errno;
701
1153
goto mandos_end;
702
1154
}
703
1155
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1159
if(if_index == AVAHI_IF_UNSPEC){
709
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1161
" incomplete without a network interface\n");
712
1163
goto mandos_end;
713
1164
}
714
1165
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1167
}
717
1168
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1170
}
722
1171
723
1172
if(quit_now){
740
1189
}
741
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
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;
782
1272
}
783
1273
784
1274
const char *out = mandos_protocol_version;
935
1425
if(buffer_length > 0){
936
1426
ssize_t decrypted_buffer_size;
937
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
1428
&decrypted_buffer, mc);
939
1429
if(decrypted_buffer_size >= 0){
940
1430
941
1431
written = 0;
967
1457
968
1458
mandos_end:
969
1459
{
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
}
970
1466
int e = errno;
971
1467
free(decrypted_buffer);
972
1468
free(buffer);
973
1469
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
975
1471
}
976
1472
if(ret == -1){
977
1473
if(e == 0){
989
1485
return retval;
990
1486
}
991
1487
1488
__attribute__((nonnull))
992
1489
static void resolve_callback(AvahiSServiceResolver *r,
993
1490
AvahiIfIndex interface,
994
1491
AvahiProtocol proto,
1002
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1501
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1502
void *mc){
1006
1503
if(r == NULL){
1007
1504
return;
1008
1505
}
1011
1508
timed out */
1012
1509
1013
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1014
1512
return;
1015
1513
}
1016
1514
1020
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1520
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1024
1523
break;
1025
1524
1026
1525
case AVAHI_RESOLVER_FOUND:
1034
1533
}
1035
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
1535
interface,
1037
avahi_proto_to_af(proto));
1536
avahi_proto_to_af(proto),
1537
mc);
1038
1538
if(ret == 0){
1039
1539
avahi_simple_poll_quit(simple_poll);
1040
1540
} else {
1041
1541
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1043
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1545
" list\n", name);
1045
1546
}
1058
1559
const char *domain,
1059
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1561
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1562
void *mc){
1062
1563
if(b == NULL){
1063
1564
return;
1064
1565
}
1075
1576
case AVAHI_BROWSER_FAILURE:
1076
1577
1077
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1079
1581
avahi_simple_poll_quit(simple_poll);
1080
1582
return;
1081
1583
1085
1587
the callback function is called the Avahi server will free the
1086
1588
resolver for us. */
1087
1589
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
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)
1091
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
1595
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1094
1598
break;
1095
1599
1096
1600
case AVAHI_BROWSER_REMOVE:
1121
1625
errno = old_errno;
1122
1626
}
1123
1627
1628
__attribute__((nonnull, warn_unused_result))
1124
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
1630
int ret;
1126
1631
error_t ret_errno;
1132
1637
errno = ret_errno;
1133
1638
return false;
1134
1639
}
1135
strcpy(ifr->ifr_name, ifname);
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1136
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
1643
if(ret == -1){
1138
1644
if(debug){
1145
1651
return true;
1146
1652
}
1147
1653
1654
__attribute__((nonnull, warn_unused_result))
1148
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1656
1150
1657
/* Reject the loopback device */
1192
1699
* corresponds to an acceptable network device.
1193
1700
* (This function is passed to scandir(3) as a filter function.)
1194
1701
*/
1702
__attribute__((nonnull, warn_unused_result))
1195
1703
int good_interface(const struct dirent *if_entry){
1196
1704
if(if_entry->d_name[0] == '.'){
1197
1705
return 0;
1215
1723
/*
1216
1724
* This function determines if a network interface is up.
1217
1725
*/
1726
__attribute__((nonnull, warn_unused_result))
1218
1727
bool interface_is_up(const char *interface){
1219
1728
struct ifreq ifr;
1220
1729
if(not get_flags(interface, &ifr)){
1231
1740
/*
1232
1741
* This function determines if a network interface is running
1233
1742
*/
1743
__attribute__((nonnull, warn_unused_result))
1234
1744
bool interface_is_running(const char *interface){
1235
1745
struct ifreq ifr;
1236
1746
if(not get_flags(interface, &ifr)){
1244
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1755
}
1246
1756
1757
__attribute__((nonnull, pure, warn_unused_result))
1247
1758
int notdotentries(const struct dirent *direntry){
1248
1759
/* Skip "." and ".." */
1249
1760
if(direntry->d_name[0] == '.'
1256
1767
}
1257
1768
1258
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1259
1771
int runnable_hook(const struct dirent *direntry){
1260
1772
int ret;
1261
1773
size_t sret;
1269
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1782
"abcdefghijklmnopqrstuvwxyz"
1271
1783
"0123456789"
1272
"_-");
1784
"_.-");
1273
1785
if((direntry->d_name)[sret] != '\0'){
1274
1786
/* Contains non-allowed characters */
1275
1787
if(debug){
1279
1791
return 0;
1280
1792
}
1281
1793
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1795
if(ret == -1){
1291
1796
if(debug){
1292
1797
perror_plus("Could not stat hook");
1316
1821
return 1;
1317
1822
}
1318
1823
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1320
1827
int ret;
1321
1828
struct timespec now;
1322
1829
struct timespec waited_time;
1323
1830
intmax_t block_time;
1324
1831
1325
1832
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1833
if(mc->current_server == NULL){
1834
if(debug){
1328
1835
fprintf_plus(stderr, "Wait until first server is found."
1329
1836
" No timeout!\n");
1330
1837
}
1331
1838
ret = avahi_simple_poll_iterate(s, -1);
1332
1839
} else {
1333
if (debug){
1840
if(debug){
1334
1841
fprintf_plus(stderr, "Check current_server if we should run"
1335
1842
" it, or wait\n");
1336
1843
}
1343
1850
/* Calculating in ms how long time between now and server
1344
1851
who we visted longest time ago. Now - last seen. */
1345
1852
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1853
- mc->current_server->last_seen.tv_sec);
1347
1854
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1855
- mc->current_server->last_seen.tv_nsec);
1349
1856
/* total time is 10s/10,000ms.
1350
1857
Converting to s from ms by dividing by 1,000,
1351
1858
and ns to ms by dividing by 1,000,000. */
1353
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1354
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1862
1356
if (debug){
1863
if(debug){
1357
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
1865
block_time);
1359
1866
}
1360
1867
1361
1868
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1366
1873
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1874
avahi_simple_poll_quit(s);
1368
1875
return 0;
1369
1876
}
1370
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1878
&mc->current_server->last_seen);
1372
1879
if(ret == -1){
1373
1880
perror_plus("clock_gettime");
1374
1881
return -1;
1375
1882
}
1376
mc.current_server = mc.current_server->next;
1883
mc->current_server = mc->current_server->next;
1377
1884
block_time = 0; /* Call avahi to find new Mandos
1378
1885
servers, but don't block */
1379
1886
}
1381
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
1889
}
1383
1890
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1891
if(ret > 0 or errno != EINTR){
1385
1892
return (ret != 1) ? ret : 0;
1386
1893
}
1387
1894
}
1388
1895
}
1389
1896
}
1390
1897
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1444
1900
const float delay){
1445
struct dirent **direntries;
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1929
if(numhooks == -1){
1930
perror_plus("scandir");
1931
return;
1932
}
1446
1933
struct dirent *direntry;
1447
1934
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1458
1945
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1466
1992
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1525
1997
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
1537
2066
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
1574
2086
}
1575
2087
2088
__attribute__((nonnull, warn_unused_result))
1576
2089
error_t bring_up_interface(const char *const interface,
1577
2090
const float delay){
1578
int sd = -1;
1579
2091
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
2092
int ret;
1582
2093
struct ifreq network;
1583
2094
unsigned int if_index = if_nametoindex(interface);
1584
2095
if(if_index == 0){
1593
2104
}
1594
2105
1595
2106
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
1597
2109
ret_errno = errno;
1598
2110
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
1600
2113
return ret_errno;
1601
2114
}
1602
network.ifr_flags |= IFF_UP;
2115
network.ifr_flags |= IFF_UP; /* set flag */
1603
2116
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
1606
2119
ret_errno = errno;
1607
2120
perror_plus("socket");
1608
2121
errno = old_errno;
1609
2122
return ret_errno;
1610
2123
}
1611
2124
1612
2125
if(quit_now){
1613
close(sd);
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
1614
2130
errno = old_errno;
1615
2131
return EINTR;
1616
2132
}
1620
2136
interface);
1621
2137
}
1622
2138
1623
/* Raise priviliges */
1624
raise_privileges();
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
1625
2145
1626
2146
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
1634
2158
}
1635
2159
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
1638
2162
#ifdef __linux__
1639
2163
if(restore_loglevel){
1640
2164
ret_linux = klogctl(7, NULL, 0);
1644
2168
}
1645
2169
#endif /* __linux__ */
1646
2170
1647
/* Lower privileges */
1648
lower_privileges();
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
1649
2180
1650
2181
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2182
ret = close(sd);
1652
2183
if(ret == -1){
1653
2184
perror_plus("close");
1654
2185
}
1655
2186
1656
2187
if(ret_setflags == -1){
1657
errno = ret_errno;
2188
errno = ioctl_errno;
1658
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2190
errno = old_errno;
1660
return ret_errno;
2191
return ioctl_errno;
1661
2192
}
1662
2193
} else if(debug){
1663
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1681
2212
return 0;
1682
2213
}
1683
2214
2215
__attribute__((nonnull, warn_unused_result))
1684
2216
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
2217
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
2218
struct ifreq network;
1690
2219
unsigned int if_index = if_nametoindex(interface);
1691
2220
if(if_index == 0){
1694
2223
return ENXIO;
1695
2224
}
1696
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
1697
2227
if(not get_flags(interface, &network) and debug){
1698
2228
ret_errno = errno;
1699
2229
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
1701
2232
return ret_errno;
1702
2233
}
1703
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2235
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
1707
2238
ret_errno = errno;
1708
2239
perror_plus("socket");
1709
2240
errno = old_errno;
1715
2246
interface);
1716
2247
}
1717
2248
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
1726
2268
1727
2269
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
int ret = close(sd);
1729
2271
if(ret == -1){
1730
2272
perror_plus("close");
1731
2273
}
1732
2274
1733
2275
if(ret_setflags == -1){
1734
errno = ret_errno;
2276
errno = ioctl_errno;
1735
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2278
errno = old_errno;
1737
return ret_errno;
2279
return ioctl_errno;
1738
2280
}
1739
2281
} else if(debug){
1740
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2288
}
1747
2289
1748
2290
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1749
2296
AvahiSServiceBrowser *sb = NULL;
1750
2297
error_t ret_errno;
1751
2298
int ret;
1752
2299
intmax_t tmpmax;
1753
2300
char *tmp;
1754
2301
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2302
char *interfaces_to_take_down = NULL;
1758
2303
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1761
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2308
const char *seckey = PATHDIR "/" SECKEY;
1763
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
1764
2311
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2312
1767
2313
bool gnutls_initialized = false;
1768
2314
bool gpgme_initialized = false;
1820
2366
.doc = "Bit length of the prime number used in the"
1821
2367
" Diffie-Hellman key exchange",
1822
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
1823
2374
{ .name = "priority", .key = 130,
1824
2375
.arg = "STRING",
1825
2376
.doc = "GnuTLS priority string for the TLS handshake",
1859
2410
connect_to = arg;
1860
2411
break;
1861
2412
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
1864
2415
if(ret_errno != 0){
1865
2416
argp_error(state, "%s", strerror(ret_errno));
1866
2417
}
1880
2431
}
1881
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1883
2437
case 130: /* --priority */
1884
2438
mc.priority = arg;
1885
2439
break;
1941
2495
goto end;
1942
2496
}
1943
2497
}
1944
2498
1945
2499
{
1946
2500
/* Work around Debian bug #633582:
1947
2501
<http://bugs.debian.org/633582> */
1948
2502
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
perror_plus("Failed to raise privileges");
2508
} else {
1951
2509
struct stat st;
1952
2510
1953
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2525
}
1968
2526
}
1969
2527
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
close(seckey_fd);
1971
2529
}
1972
2530
}
1973
2531
1974
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2533
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2534
if(pubkey_fd == -1){
1988
2546
}
1989
2547
}
1990
2548
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
1995
2575
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2579
perror_plus("Failed to lower privileges");
2000
2580
}
2001
2581
}
2002
2582
}
2003
2583
2004
/* Remove empty interface names */
2584
/* Remove invalid interface names (except "none") */
2005
2585
{
2006
2586
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2588
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2011
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2593
" \"%s\"\n", interface);
2013
2594
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2596
interface = NULL;
2016
2597
}
2017
2598
}
2019
2600
2020
2601
/* Run network hooks */
2021
2602
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2025
2605
if(interfaces_hooks == NULL){
2026
2606
perror_plus("malloc");
2027
2607
goto end;
2028
2608
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2038
2614
}
2039
2615
2040
2616
if(not debug){
2117
2693
}
2118
2694
2119
2695
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2122
2698
/* Look for any good interfaces */
2123
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2700
alphasort);
2125
2701
if(ret >= 1){
2126
2702
/* Add all found interfaces to interfaces list */
2127
2703
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2705
direntries[i]->d_name);
2130
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2131
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2132
2710
continue;
2133
2711
}
2134
2712
if(debug){
2135
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2714
direntries[i]->d_name);
2137
2715
}
2716
free(direntries[i]);
2138
2717
}
2139
2718
free(direntries);
2140
2719
} else {
2141
free(direntries);
2720
if(ret == 0){
2721
free(direntries);
2722
}
2142
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2724
exitcode = EXIT_FAILURE;
2144
2725
goto end;
2145
2726
}
2146
2727
}
2147
2728
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2160
2731
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
2746
}
2747
}
2748
break;
2749
}
2163
2750
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2751
errno = bring_up_interface(interface, delay);
2165
2752
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2169
2756
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2173
2763
}
2174
2764
}
2175
2765
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2766
if(debug and (interfaces_to_take_down == NULL)){
2180
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2768
}
2182
2769
}
2183
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2778
}
2779
2184
2780
if(quit_now){
2185
2781
goto end;
2186
2782
}
2187
2783
2188
ret = init_gnutls_global(pubkey, seckey);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2189
2785
if(ret == -1){
2190
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
2787
exitcode = EX_UNAVAILABLE;
2198
2794
goto end;
2199
2795
}
2200
2796
2201
if(mkdtemp(tempdir) == NULL){
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2202
2807
perror_plus("mkdtemp");
2203
2808
goto end;
2204
2809
}
2205
tempdir_created = true;
2206
2810
2207
2811
if(quit_now){
2208
2812
goto end;
2209
2813
}
2210
2814
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
2816
fprintf_plus(stderr, "init_gpgme failed\n");
2213
2817
exitcode = EX_UNAVAILABLE;
2214
2818
goto end;
2244
2848
exitcode = EX_USAGE;
2245
2849
goto end;
2246
2850
}
2247
2851
2248
2852
if(quit_now){
2249
2853
goto end;
2250
2854
}
2271
2875
}
2272
2876
2273
2877
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2275
2880
if(quit_now or ret == 0){
2276
2881
break;
2277
2882
}
2279
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
2885
(int)retry_interval);
2281
2886
}
2282
sleep((int)retry_interval);
2887
sleep((unsigned int)retry_interval);
2283
2888
}
2284
2889
2285
if (not quit_now){
2890
if(not quit_now){
2286
2891
exitcode = EXIT_SUCCESS;
2287
2892
}
2288
2893
2325
2930
/* Create the Avahi service browser */
2326
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2329
2935
if(sb == NULL){
2330
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
2937
avahi_strerror(avahi_server_errno(mc.server)));
2342
2948
if(debug){
2343
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
2950
}
2345
2951
2346
2952
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2953
(int)(retry_interval * 1000), &mc);
2348
2954
if(debug){
2349
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
2956
(ret == 0) ? "successfully" : "with error");
2357
2963
}
2358
2964
2359
2965
/* Cleanup things */
2966
free(mc.interfaces);
2967
2360
2968
if(sb != NULL)
2361
2969
avahi_s_service_browser_free(sb);
2362
2970
2382
2990
mc.current_server->prev->next = NULL;
2383
2991
while(mc.current_server != NULL){
2384
2992
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
2385
3001
free(mc.current_server);
2386
3002
mc.current_server = next;
2387
3003
}
2388
3004
}
2389
3005
2390
/* Re-raise priviliges */
3006
/* Re-raise privileges */
2391
3007
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to raise privileges");
3012
} else {
3013
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3017
3018
/* Take down the network interfaces which were brought up */
3019
{
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3027
perror_plus("Failed to take down interface");
3028
}
3029
}
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3032
" down\n");
3033
}
3034
}
3035
}
3036
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
3041
}
2417
3042
}
2418
3043
2419
3044
free(interfaces_to_take_down);
2420
3045
free(interfaces_hooks);
2421
3046
2422
3047
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
3048
if(tempdir != NULL){
2424
3049
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
2431
char *fullname = NULL;
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
direntry->d_name);
2434
if(ret < 0){
2435
perror_plus("asprintf");
2436
continue;
2437
}
2438
ret = remove(fullname);
2439
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
2442
}
2443
free(fullname);
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
2444
3089
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
2451
}
2452
ret = rmdir(tempdir);
2453
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
3090
close(tempdir_fd);
2455
3091
}
2456
3092
}
2457
3093
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0