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- Committer: Teddy Hogeborn
- Date: 2015-10-24 17:37:16 UTC
- mfrom: (237.7.338 trunk)
- Revision ID: teddy@recompile.se-20151024173716-cmst924xz22yq58z
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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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(), 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
#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;
1145
1650
return true;
1146
1651
}
1147
1652
1653
__attribute__((nonnull, warn_unused_result))
1148
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1655
1150
1656
/* Reject the loopback device */
1192
1698
* corresponds to an acceptable network device.
1193
1699
* (This function is passed to scandir(3) as a filter function.)
1194
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1195
1702
int good_interface(const struct dirent *if_entry){
1196
1703
if(if_entry->d_name[0] == '.'){
1197
1704
return 0;
1215
1722
/*
1216
1723
* This function determines if a network interface is up.
1217
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1218
1726
bool interface_is_up(const char *interface){
1219
1727
struct ifreq ifr;
1220
1728
if(not get_flags(interface, &ifr)){
1231
1739
/*
1232
1740
* This function determines if a network interface is running
1233
1741
*/
1742
__attribute__((nonnull, warn_unused_result))
1234
1743
bool interface_is_running(const char *interface){
1235
1744
struct ifreq ifr;
1236
1745
if(not get_flags(interface, &ifr)){
1244
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1754
}
1246
1755
1756
__attribute__((nonnull, pure, warn_unused_result))
1247
1757
int notdotentries(const struct dirent *direntry){
1248
1758
/* Skip "." and ".." */
1249
1759
if(direntry->d_name[0] == '.'
1256
1766
}
1257
1767
1258
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1259
1770
int runnable_hook(const struct dirent *direntry){
1260
1771
int ret;
1261
1772
size_t sret;
1269
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1781
"abcdefghijklmnopqrstuvwxyz"
1271
1782
"0123456789"
1272
"_-");
1783
"_.-");
1273
1784
if((direntry->d_name)[sret] != '\0'){
1274
1785
/* Contains non-allowed characters */
1275
1786
if(debug){
1279
1790
return 0;
1280
1791
}
1281
1792
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);
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1794
if(ret == -1){
1291
1795
if(debug){
1292
1796
perror_plus("Could not stat hook");
1316
1820
return 1;
1317
1821
}
1318
1822
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1320
1826
int ret;
1321
1827
struct timespec now;
1322
1828
struct timespec waited_time;
1323
1829
intmax_t block_time;
1324
1830
1325
1831
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1832
if(mc->current_server == NULL){
1833
if(debug){
1328
1834
fprintf_plus(stderr, "Wait until first server is found."
1329
1835
" No timeout!\n");
1330
1836
}
1331
1837
ret = avahi_simple_poll_iterate(s, -1);
1332
1838
} else {
1333
if (debug){
1839
if(debug){
1334
1840
fprintf_plus(stderr, "Check current_server if we should run"
1335
1841
" it, or wait\n");
1336
1842
}
1343
1849
/* Calculating in ms how long time between now and server
1344
1850
who we visted longest time ago. Now - last seen. */
1345
1851
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1852
- mc->current_server->last_seen.tv_sec);
1347
1853
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1854
- mc->current_server->last_seen.tv_nsec);
1349
1855
/* total time is 10s/10,000ms.
1350
1856
Converting to s from ms by dividing by 1,000,
1351
1857
and ns to ms by dividing by 1,000,000. */
1353
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1354
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1861
1356
if (debug){
1862
if(debug){
1357
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
1864
block_time);
1359
1865
}
1360
1866
1361
1867
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);
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);
1366
1872
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1873
avahi_simple_poll_quit(s);
1368
1874
return 0;
1369
1875
}
1370
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1877
&mc->current_server->last_seen);
1372
1878
if(ret == -1){
1373
1879
perror_plus("clock_gettime");
1374
1880
return -1;
1375
1881
}
1376
mc.current_server = mc.current_server->next;
1882
mc->current_server = mc->current_server->next;
1377
1883
block_time = 0; /* Call avahi to find new Mandos
1378
1884
servers, but don't block */
1379
1885
}
1381
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
1888
}
1383
1889
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1890
if(ret > 0 or errno != EINTR){
1385
1891
return (ret != 1) ? ret : 0;
1386
1892
}
1387
1893
}
1388
1894
}
1389
1895
}
1390
1896
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,
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1444
1899
const float delay){
1445
struct dirent **direntries;
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__ */
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1446
1932
struct dirent *direntry;
1447
1933
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");
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);
1458
1944
}
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){
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){
1466
1991
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
}
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1525
1996
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
}
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;
1537
2065
} 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;
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);
1574
2085
}
1575
2086
2087
__attribute__((nonnull, warn_unused_result))
1576
2088
error_t bring_up_interface(const char *const interface,
1577
2089
const float delay){
1578
int sd = -1;
1579
2090
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
2091
int ret;
1582
2092
struct ifreq network;
1583
2093
unsigned int if_index = if_nametoindex(interface);
1584
2094
if(if_index == 0){
1593
2103
}
1594
2104
1595
2105
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
1597
2108
ret_errno = errno;
1598
2109
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
1600
2112
return ret_errno;
1601
2113
}
1602
network.ifr_flags |= IFF_UP;
2114
network.ifr_flags |= IFF_UP; /* set flag */
1603
2115
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
1606
2118
ret_errno = errno;
1607
2119
perror_plus("socket");
1608
2120
errno = old_errno;
1609
2121
return ret_errno;
1610
2122
}
1611
2123
1612
2124
if(quit_now){
1613
close(sd);
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
1614
2129
errno = old_errno;
1615
2130
return EINTR;
1616
2131
}
1620
2135
interface);
1621
2136
}
1622
2137
1623
/* Raise priviliges */
1624
raise_privileges();
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
2144
1626
2145
#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");
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
}
1634
2157
}
1635
2158
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
1638
2161
#ifdef __linux__
1639
2162
if(restore_loglevel){
1640
2163
ret_linux = klogctl(7, NULL, 0);
1644
2167
}
1645
2168
#endif /* __linux__ */
1646
2169
1647
/* Lower privileges */
1648
lower_privileges();
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
2179
1650
2180
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
ret = close(sd);
1652
2182
if(ret == -1){
1653
2183
perror_plus("close");
1654
2184
}
1655
2185
1656
2186
if(ret_setflags == -1){
1657
errno = ret_errno;
2187
errno = ioctl_errno;
1658
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2189
errno = old_errno;
1660
return ret_errno;
2190
return ioctl_errno;
1661
2191
}
1662
2192
} else if(debug){
1663
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1681
2211
return 0;
1682
2212
}
1683
2213
2214
__attribute__((nonnull, warn_unused_result))
1684
2215
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
2216
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
2217
struct ifreq network;
1690
2218
unsigned int if_index = if_nametoindex(interface);
1691
2219
if(if_index == 0){
1694
2222
return ENXIO;
1695
2223
}
1696
2224
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
1697
2226
if(not get_flags(interface, &network) and debug){
1698
2227
ret_errno = errno;
1699
2228
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
1701
2231
return ret_errno;
1702
2232
}
1703
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2234
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
1707
2237
ret_errno = errno;
1708
2238
perror_plus("socket");
1709
2239
errno = old_errno;
1715
2245
interface);
1716
2246
}
1717
2247
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();
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
}
1726
2267
1727
2268
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
int ret = close(sd);
1729
2270
if(ret == -1){
1730
2271
perror_plus("close");
1731
2272
}
1732
2273
1733
2274
if(ret_setflags == -1){
1734
errno = ret_errno;
2275
errno = ioctl_errno;
1735
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2277
errno = old_errno;
1737
return ret_errno;
2278
return ioctl_errno;
1738
2279
}
1739
2280
} else if(debug){
1740
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2287
}
1747
2288
1748
2289
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 };
1749
2295
AvahiSServiceBrowser *sb = NULL;
1750
2296
error_t ret_errno;
1751
2297
int ret;
1752
2298
intmax_t tmpmax;
1753
2299
char *tmp;
1754
2300
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2301
char *interfaces_to_take_down = NULL;
1758
2302
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1761
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2307
const char *seckey = PATHDIR "/" SECKEY;
1763
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
1764
2310
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2311
1767
2312
bool gnutls_initialized = false;
1768
2313
bool gpgme_initialized = false;
1820
2365
.doc = "Bit length of the prime number used in the"
1821
2366
" Diffie-Hellman key exchange",
1822
2367
.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 },
1823
2373
{ .name = "priority", .key = 130,
1824
2374
.arg = "STRING",
1825
2375
.doc = "GnuTLS priority string for the TLS handshake",
1859
2409
connect_to = arg;
1860
2410
break;
1861
2411
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
1864
2414
if(ret_errno != 0){
1865
2415
argp_error(state, "%s", strerror(ret_errno));
1866
2416
}
1880
2430
}
1881
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1883
2436
case 130: /* --priority */
1884
2437
mc.priority = arg;
1885
2438
break;
1941
2494
goto end;
1942
2495
}
1943
2496
}
1944
2497
1945
2498
{
1946
2499
/* Work around Debian bug #633582:
1947
2500
<http://bugs.debian.org/633582> */
1948
2501
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
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
2508
struct stat st;
1952
2509
1953
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2524
}
1968
2525
}
1969
2526
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2527
close(seckey_fd);
1971
2528
}
1972
2529
}
1973
2530
1974
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2532
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2533
if(pubkey_fd == -1){
1988
2545
}
1989
2546
}
1990
2547
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
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
1995
2574
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2000
2579
}
2001
2580
}
2002
2581
}
2003
2582
2004
/* Remove empty interface names */
2583
/* Remove invalid interface names (except "none") */
2005
2584
{
2006
2585
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2587
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2011
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2592
" \"%s\"\n", interface);
2013
2593
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2595
interface = NULL;
2016
2596
}
2017
2597
}
2019
2599
2020
2600
/* Run network hooks */
2021
2601
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2025
2604
if(interfaces_hooks == NULL){
2026
2605
perror_plus("malloc");
2027
2606
goto end;
2028
2607
}
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
}
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);
2038
2613
}
2039
2614
2040
2615
if(not debug){
2117
2692
}
2118
2693
2119
2694
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2122
2697
/* Look for any good interfaces */
2123
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2699
alphasort);
2125
2700
if(ret >= 1){
2126
2701
/* Add all found interfaces to interfaces list */
2127
2702
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2704
direntries[i]->d_name);
2130
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2131
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2132
2709
continue;
2133
2710
}
2134
2711
if(debug){
2135
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2713
direntries[i]->d_name);
2137
2714
}
2715
free(direntries[i]);
2138
2716
}
2139
2717
free(direntries);
2140
2718
} else {
2141
free(direntries);
2719
if(ret == 0){
2720
free(direntries);
2721
}
2142
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2723
exitcode = EXIT_FAILURE;
2144
2724
goto end;
2145
2725
}
2146
2726
}
2147
2727
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)){
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2160
2730
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2732
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
}
2163
2749
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2750
errno = bring_up_interface(interface, delay);
2165
2751
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2169
2755
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
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
}
2173
2762
}
2174
2763
}
2175
2764
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2765
if(debug and (interfaces_to_take_down == NULL)){
2180
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2767
}
2182
2768
}
2183
2769
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
2184
2779
if(quit_now){
2185
2780
goto end;
2186
2781
}
2187
2782
2188
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2189
2784
if(ret == -1){
2190
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
2786
exitcode = EX_UNAVAILABLE;
2198
2793
goto end;
2199
2794
}
2200
2795
2201
if(mkdtemp(tempdir) == NULL){
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){
2202
2806
perror_plus("mkdtemp");
2203
2807
goto end;
2204
2808
}
2205
tempdir_created = true;
2206
2809
2207
2810
if(quit_now){
2208
2811
goto end;
2209
2812
}
2210
2813
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2213
2816
exitcode = EX_UNAVAILABLE;
2214
2817
goto end;
2244
2847
exitcode = EX_USAGE;
2245
2848
goto end;
2246
2849
}
2247
2850
2248
2851
if(quit_now){
2249
2852
goto end;
2250
2853
}
2271
2874
}
2272
2875
2273
2876
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2275
2879
if(quit_now or ret == 0){
2276
2880
break;
2277
2881
}
2279
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
2884
(int)retry_interval);
2281
2885
}
2282
sleep((int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2283
2887
}
2284
2888
2285
if (not quit_now){
2889
if(not quit_now){
2286
2890
exitcode = EXIT_SUCCESS;
2287
2891
}
2288
2892
2325
2929
/* Create the Avahi service browser */
2326
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2329
2934
if(sb == NULL){
2330
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
2936
avahi_strerror(avahi_server_errno(mc.server)));
2342
2947
if(debug){
2343
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
2949
}
2345
2950
2346
2951
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2952
(int)(retry_interval * 1000), &mc);
2348
2953
if(debug){
2349
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
2955
(ret == 0) ? "successfully" : "with error");
2357
2962
}
2358
2963
2359
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
2360
2967
if(sb != NULL)
2361
2968
avahi_s_service_browser_free(sb);
2362
2969
2382
2989
mc.current_server->prev->next = NULL;
2383
2990
while(mc.current_server != NULL){
2384
2991
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
2385
3000
free(mc.current_server);
2386
3001
mc.current_server = next;
2387
3002
}
2388
3003
}
2389
3004
2390
/* Re-raise priviliges */
3005
/* Re-raise privileges */
2391
3006
{
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();
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
}
2417
3041
}
2418
3042
2419
3043
free(interfaces_to_take_down);
2420
3044
free(interfaces_hooks);
2421
3045
2422
3046
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
3047
if(tempdir != NULL){
2424
3048
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);
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
}
2444
3088
}
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");
3089
close(tempdir_fd);
2455
3090
}
2456
3091
}
2457
3092
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0