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- Committer: Teddy Hogeborn
- Date: 2012-06-14 17:03:12 UTC
- Revision ID: teddy@recompile.se-20120614170312-pl62gn832v09z4bi
* plugins.d/mandos-client.c: Don't use assert(). Use in_port_t for
port numbers everywhere except the
"resolve_callback" function; its
signature is forced by the signature of
the avahi_s_service_resolver_new
function.
port numbers everywhere except the
"resolve_callback" function; its
signature is forced by the signature of
the avahi_s_service_resolver_new
function.
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
93
91
argz_delete(), argz_append(),
94
92
argz_stringify(), argz_add(),
95
93
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
94
99
95
#ifdef __linux__
100
96
#include <sys/klog.h> /* klogctl() */
142
138
static const char sys_class_net[] = "/sys/class/net";
143
139
char *connect_to = NULL;
144
140
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
141
uid_t uid = 65534;
147
142
gid_t gid = 65534;
148
143
159
154
160
155
/* Used for passing in values through the Avahi callback functions */
161
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
162
158
AvahiServer *server;
163
159
gnutls_certificate_credentials_t cred;
164
160
unsigned int dh_bits;
166
162
const char *priority;
167
163
gpgme_ctx_t ctx;
168
164
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
165
} mandos_context;
172
166
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
175
172
176
173
sig_atomic_t quit_now = 0;
177
174
int signal_received = 0;
185
182
perror(print_text);
186
183
}
187
184
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
189
186
int fprintf_plus(FILE *stream, const char *format, ...){
190
187
va_list ap;
191
188
va_start (ap, format);
192
189
193
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
191
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
193
}
197
194
198
195
/*
200
197
* bytes. "buffer_capacity" is how much is currently allocated,
201
198
* "buffer_length" is how much is already used.
202
199
*/
203
__attribute__((nonnull, warn_unused_result))
204
200
size_t incbuffer(char **buffer, size_t buffer_length,
205
201
size_t buffer_capacity){
206
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
213
205
return 0;
214
206
}
215
*buffer = new_buf;
216
207
buffer_capacity += BUFFER_SIZE;
217
208
}
218
209
return buffer_capacity;
219
210
}
220
211
221
212
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
214
int af){
225
215
int ret;
226
216
server *new_server = malloc(sizeof(server));
227
217
if(new_server == NULL){
234
224
.af = af };
235
225
if(new_server->ip == NULL){
236
226
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
227
return false;
253
228
}
254
229
/* Special case of first server */
255
if(*current_server == NULL){
230
if (mc.current_server == NULL){
256
231
new_server->next = new_server;
257
232
new_server->prev = new_server;
258
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
259
235
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
263
238
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
265
245
}
266
246
return true;
267
247
}
269
249
/*
270
250
* Initialize GPGME.
271
251
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
277
254
gpgme_error_t rc;
278
255
gpgme_engine_info_t engine_info;
279
256
257
280
258
/*
281
259
* Helper function to insert pub and seckey to the engine keyring.
282
260
*/
283
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
284
262
int ret;
285
263
int fd;
286
264
gpgme_data_t pgp_data;
298
276
return false;
299
277
}
300
278
301
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
302
280
if(rc != GPG_ERR_NO_ERROR){
303
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
282
gpgme_strsource(rc), gpgme_strerror(rc));
348
326
}
349
327
350
328
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
352
330
if(rc != GPG_ERR_NO_ERROR){
353
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
345
* Decrypt OpenPGP data.
368
346
* Returns -1 on error
369
347
*/
370
__attribute__((nonnull, warn_unused_result))
371
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
349
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
350
char **plaintext){
375
351
gpgme_data_t dh_crypto, dh_plain;
376
352
gpgme_error_t rc;
377
353
ssize_t ret;
403
379
404
380
/* Decrypt data from the cryptotext data buffer to the plaintext
405
381
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
383
if(rc != GPG_ERR_NO_ERROR){
408
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
385
gpgme_strsource(rc), gpgme_strerror(rc));
410
386
plaintext_length = -1;
411
387
if(debug){
412
388
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
414
390
if(result == NULL){
415
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
392
} else {
493
469
return plaintext_length;
494
470
}
495
471
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
472
static const char * safer_gnutls_strerror(int value){
505
473
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
507
477
}
508
478
509
479
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
480
static void debuggnutls(__attribute__((unused)) int level,
512
481
const char* string){
513
482
fprintf_plus(stderr, "GnuTLS: %s", string);
514
483
}
515
484
516
__attribute__((nonnull, warn_unused_result))
517
485
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
486
const char *seckeyfilename){
521
487
int ret;
522
unsigned int uret;
523
488
524
489
if(debug){
525
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
541
506
}
542
507
543
508
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
510
if(ret != GNUTLS_E_SUCCESS){
546
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
512
safer_gnutls_strerror(ret));
557
522
}
558
523
559
524
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
561
526
GNUTLS_OPENPGP_FMT_BASE64);
562
527
if(ret != GNUTLS_E_SUCCESS){
563
528
fprintf_plus(stderr,
569
534
}
570
535
571
536
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
573
538
if(ret != GNUTLS_E_SUCCESS){
574
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
540
" initialization: %s\n",
576
541
safer_gnutls_strerror(ret));
577
542
goto globalfail;
578
543
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
552
753
553
return 0;
754
554
755
555
globalfail:
756
556
757
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_certificate_free_credentials(mc.cred);
758
558
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
559
gnutls_dh_params_deinit(mc.dh_params);
760
560
return -1;
761
561
}
762
562
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
766
564
int ret;
767
565
/* GnuTLS session creation */
768
566
do {
780
578
{
781
579
const char *err;
782
580
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
582
if(quit_now){
785
583
gnutls_deinit(*session);
786
584
return -1;
797
595
798
596
do {
799
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
598
mc.cred);
801
599
if(quit_now){
802
600
gnutls_deinit(*session);
803
601
return -1;
813
611
/* ignore client certificate if any. */
814
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
613
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
816
616
return 0;
817
617
}
818
618
820
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
621
__attribute__((unused)) const char *txt){}
822
622
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
623
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
624
static int start_mandos_communication(const char *ip, in_port_t port,
1043
625
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
626
int af){
1045
627
int ret, tcp_sd = -1;
1046
628
ssize_t sret;
1047
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1048
633
char *buffer = NULL;
1049
634
char *decrypted_buffer = NULL;
1050
635
size_t buffer_length = 0;
1053
638
int retval = -1;
1054
639
gnutls_session_t session;
1055
640
int pf; /* Protocol family */
1056
bool route_added = false;
1057
641
1058
642
errno = 0;
1059
643
1075
659
return -1;
1076
660
}
1077
661
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
1111
663
if(ret != 0){
1112
664
return -1;
1113
665
}
1117
669
PRIuMAX "\n", ip, (uintmax_t)port);
1118
670
}
1119
671
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
673
if(tcp_sd < 0){
1122
674
int e = errno;
1123
675
perror_plus("socket");
1130
682
goto mandos_end;
1131
683
}
1132
684
685
memset(&to, 0, sizeof(to));
1133
686
if(af == AF_INET6){
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
689
} else { /* IPv4 */
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1141
692
}
1142
693
if(ret < 0 ){
1143
694
int e = errno;
1152
703
goto mandos_end;
1153
704
}
1154
705
if(af == AF_INET6){
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1158
710
if(if_index == AVAHI_IF_UNSPEC){
1159
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
712
" incomplete without a network interface\n");
1162
714
goto mandos_end;
1163
715
}
1164
716
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
718
}
1167
719
} else {
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1169
723
}
1170
724
1171
725
if(quit_now){
1188
742
}
1189
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(errno == ENETUNREACH
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1271
784
}
1272
785
1273
786
const char *out = mandos_protocol_version;
1424
937
if(buffer_length > 0){
1425
938
ssize_t decrypted_buffer_size;
1426
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
940
&decrypted_buffer);
1428
941
if(decrypted_buffer_size >= 0){
1429
942
1430
943
written = 0;
1456
969
1457
970
mandos_end:
1458
971
{
1459
if(route_added){
1460
if(not delete_local_route(ip, if_index)){
1461
fprintf_plus(stderr, "Failed to delete local route to %s on"
1462
" interface %d", ip, if_index);
1463
}
1464
}
1465
972
int e = errno;
1466
973
free(decrypted_buffer);
1467
974
free(buffer);
1484
991
return retval;
1485
992
}
1486
993
1487
__attribute__((nonnull))
1488
994
static void resolve_callback(AvahiSServiceResolver *r,
1489
995
AvahiIfIndex interface,
1490
996
AvahiProtocol proto,
1498
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1499
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1500
1006
flags,
1501
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1502
1008
if(r == NULL){
1503
1009
return;
1504
1010
}
1507
1013
timed out */
1508
1014
1509
1015
if(quit_now){
1510
avahi_s_service_resolver_free(r);
1511
1016
return;
1512
1017
}
1513
1018
1517
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1518
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1519
1024
domain,
1520
avahi_strerror(avahi_server_errno
1521
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1522
1026
break;
1523
1027
1524
1028
case AVAHI_RESOLVER_FOUND:
1532
1036
}
1533
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1534
1038
interface,
1535
avahi_proto_to_af(proto),
1536
mc);
1039
avahi_proto_to_af(proto));
1537
1040
if(ret == 0){
1538
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1539
1042
} else {
1540
1043
if(not add_server(ip, (in_port_t)port, interface,
1541
avahi_proto_to_af(proto),
1542
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1543
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1544
1046
" list\n", name);
1545
1047
}
1558
1060
const char *domain,
1559
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1560
1062
flags,
1561
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1562
1064
if(b == NULL){
1563
1065
return;
1564
1066
}
1575
1077
case AVAHI_BROWSER_FAILURE:
1576
1078
1577
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1578
avahi_strerror(avahi_server_errno
1579
(((mandos_context*)mc)->server)));
1580
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1581
1082
return;
1582
1083
1583
1084
case AVAHI_BROWSER_NEW:
1586
1087
the callback function is called the Avahi server will free the
1587
1088
resolver for us. */
1588
1089
1589
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1590
interface, protocol, name, type,
1591
domain, protocol, 0,
1592
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1593
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1594
1094
" %s\n", name,
1595
avahi_strerror(avahi_server_errno
1596
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1597
1096
break;
1598
1097
1599
1098
case AVAHI_BROWSER_REMOVE:
1618
1117
signal_received = sig;
1619
1118
int old_errno = errno;
1620
1119
/* set main loop to exit */
1621
if(simple_poll != NULL){
1622
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1623
1122
}
1624
1123
errno = old_errno;
1625
1124
}
1626
1125
1627
__attribute__((nonnull, warn_unused_result))
1628
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1629
1127
int ret;
1630
1128
error_t ret_errno;
1649
1147
return true;
1650
1148
}
1651
1149
1652
__attribute__((nonnull, warn_unused_result))
1653
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1654
1151
1655
1152
/* Reject the loopback device */
1697
1194
* corresponds to an acceptable network device.
1698
1195
* (This function is passed to scandir(3) as a filter function.)
1699
1196
*/
1700
__attribute__((nonnull, warn_unused_result))
1701
1197
int good_interface(const struct dirent *if_entry){
1702
1198
if(if_entry->d_name[0] == '.'){
1703
1199
return 0;
1721
1217
/*
1722
1218
* This function determines if a network interface is up.
1723
1219
*/
1724
__attribute__((nonnull, warn_unused_result))
1725
1220
bool interface_is_up(const char *interface){
1726
1221
struct ifreq ifr;
1727
1222
if(not get_flags(interface, &ifr)){
1738
1233
/*
1739
1234
* This function determines if a network interface is running
1740
1235
*/
1741
__attribute__((nonnull, warn_unused_result))
1742
1236
bool interface_is_running(const char *interface){
1743
1237
struct ifreq ifr;
1744
1238
if(not get_flags(interface, &ifr)){
1752
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1753
1247
}
1754
1248
1755
__attribute__((nonnull, pure, warn_unused_result))
1756
1249
int notdotentries(const struct dirent *direntry){
1757
1250
/* Skip "." and ".." */
1758
1251
if(direntry->d_name[0] == '.'
1765
1258
}
1766
1259
1767
1260
/* Is this directory entry a runnable program? */
1768
__attribute__((nonnull, warn_unused_result))
1769
1261
int runnable_hook(const struct dirent *direntry){
1770
1262
int ret;
1771
1263
size_t sret;
1779
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1780
1272
"abcdefghijklmnopqrstuvwxyz"
1781
1273
"0123456789"
1782
"_.-");
1274
"_-");
1783
1275
if((direntry->d_name)[sret] != '\0'){
1784
1276
/* Contains non-allowed characters */
1785
1277
if(debug){
1789
1281
return 0;
1790
1282
}
1791
1283
1792
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1793
1292
if(ret == -1){
1794
1293
if(debug){
1795
1294
perror_plus("Could not stat hook");
1819
1318
return 1;
1820
1319
}
1821
1320
1822
__attribute__((nonnull, warn_unused_result))
1823
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1824
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1825
1322
int ret;
1826
1323
struct timespec now;
1827
1324
struct timespec waited_time;
1828
1325
intmax_t block_time;
1829
1326
1830
1327
while(true){
1831
if(mc->current_server == NULL){
1832
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1833
1330
fprintf_plus(stderr, "Wait until first server is found."
1834
1331
" No timeout!\n");
1835
1332
}
1836
1333
ret = avahi_simple_poll_iterate(s, -1);
1837
1334
} else {
1838
if(debug){
1335
if (debug){
1839
1336
fprintf_plus(stderr, "Check current_server if we should run"
1840
1337
" it, or wait\n");
1841
1338
}
1848
1345
/* Calculating in ms how long time between now and server
1849
1346
who we visted longest time ago. Now - last seen. */
1850
1347
waited_time.tv_sec = (now.tv_sec
1851
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1852
1349
waited_time.tv_nsec = (now.tv_nsec
1853
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1854
1351
/* total time is 10s/10,000ms.
1855
1352
Converting to s from ms by dividing by 1,000,
1856
1353
and ns to ms by dividing by 1,000,000. */
1858
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1859
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1860
1357
1861
if(debug){
1358
if (debug){
1862
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1863
1360
block_time);
1864
1361
}
1865
1362
1866
1363
if(block_time <= 0){
1867
ret = start_mandos_communication(mc->current_server->ip,
1868
mc->current_server->port,
1869
mc->current_server->if_index,
1870
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1871
1368
if(ret == 0){
1872
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1873
1370
return 0;
1874
1371
}
1875
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1876
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1877
1374
if(ret == -1){
1878
1375
perror_plus("clock_gettime");
1879
1376
return -1;
1880
1377
}
1881
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1882
1379
block_time = 0; /* Call avahi to find new Mandos
1883
1380
servers, but don't block */
1884
1381
}
1886
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1887
1384
}
1888
1385
if(ret != 0){
1889
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1890
1387
return (ret != 1) ? ret : 0;
1891
1388
}
1892
1389
}
1893
1390
}
1894
1391
}
1895
1392
1896
__attribute__((nonnull))
1897
void run_network_hooks(const char *mode, const char *interface,
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1898
1446
const float delay){
1899
struct dirent **direntries = NULL;
1900
if(hookdir_fd == -1){
1901
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1902
| O_CLOEXEC);
1903
if(hookdir_fd == -1){
1904
if(errno == ENOENT){
1905
if(debug){
1906
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1907
" found\n", hookdir);
1908
}
1909
} else {
1910
perror_plus("open");
1911
}
1912
return;
1913
}
1914
}
1915
#ifdef __GLIBC__
1916
#if __GLIBC_PREREQ(2, 15)
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
alphasort);
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
alphasort);
1926
#endif /* not __GLIBC__ */
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1927
1452
if(numhooks == -1){
1928
1453
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1990
1461
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1995
1520
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
2064
1532
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
2084
1569
}
2085
1570
2086
__attribute__((nonnull, warn_unused_result))
2087
1571
error_t bring_up_interface(const char *const interface,
2088
1572
const float delay){
1573
int sd = -1;
2089
1574
error_t old_errno = errno;
2090
int ret;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
2091
1577
struct ifreq network;
2092
1578
unsigned int if_index = if_nametoindex(interface);
2093
1579
if(if_index == 0){
2102
1588
}
2103
1589
2104
1590
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
1591
if(not get_flags(interface, &network) and debug){
2107
1592
ret_errno = errno;
2108
1593
fprintf_plus(stderr, "Failed to get flags for interface "
2109
1594
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
1595
return ret_errno;
2112
1596
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
1597
network.ifr_flags |= IFF_UP;
2114
1598
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
2117
1601
ret_errno = errno;
2118
1602
perror_plus("socket");
2119
1603
errno = old_errno;
2120
1604
return ret_errno;
2121
1605
}
2122
1606
2123
1607
if(quit_now){
2124
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
1608
close(sd);
2128
1609
errno = old_errno;
2129
1610
return EINTR;
2130
1611
}
2134
1615
interface);
2135
1616
}
2136
1617
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
1618
/* Raise priviliges */
1619
raise_privileges();
2143
1620
2144
1621
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
2156
1629
}
2157
1630
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
2160
1633
#ifdef __linux__
2161
1634
if(restore_loglevel){
2162
1635
ret_linux = klogctl(7, NULL, 0);
2166
1639
}
2167
1640
#endif /* __linux__ */
2168
1641
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
1642
/* Lower privileges */
1643
lower_privileges();
2178
1644
2179
1645
/* Close the socket */
2180
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2183
1649
}
2184
1650
2185
1651
if(ret_setflags == -1){
2186
errno = ioctl_errno;
1652
errno = ret_errno;
2187
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
1654
errno = old_errno;
2189
return ioctl_errno;
1655
return ret_errno;
2190
1656
}
2191
1657
} else if(debug){
2192
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2210
1676
return 0;
2211
1677
}
2212
1678
2213
__attribute__((nonnull, warn_unused_result))
2214
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
2215
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
2216
1684
struct ifreq network;
2217
1685
unsigned int if_index = if_nametoindex(interface);
2218
1686
if(if_index == 0){
2221
1689
return ENXIO;
2222
1690
}
2223
1691
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
1692
if(not get_flags(interface, &network) and debug){
2226
1693
ret_errno = errno;
2227
1694
fprintf_plus(stderr, "Failed to get flags for interface "
2228
1695
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
1696
return ret_errno;
2231
1697
}
2232
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
1699
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
2236
1702
ret_errno = errno;
2237
1703
perror_plus("socket");
2238
1704
errno = old_errno;
2244
1710
interface);
2245
1711
}
2246
1712
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
2266
1721
2267
1722
/* Close the socket */
2268
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
1724
if(ret == -1){
2270
1725
perror_plus("close");
2271
1726
}
2272
1727
2273
1728
if(ret_setflags == -1){
2274
errno = ioctl_errno;
1729
errno = ret_errno;
2275
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
1731
errno = old_errno;
2277
return ioctl_errno;
1732
return ret_errno;
2278
1733
}
2279
1734
} else if(debug){
2280
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2286
1741
}
2287
1742
2288
1743
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
2293
1744
AvahiSServiceBrowser *sb = NULL;
2294
1745
error_t ret_errno;
2295
1746
int ret;
2296
1747
intmax_t tmpmax;
2297
1748
char *tmp;
2298
1749
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
2299
1752
char *interfaces_to_take_down = NULL;
2300
1753
size_t interfaces_to_take_down_size = 0;
2301
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2302
char old_tempdir[] = "/tmp/mandosXXXXXX";
2303
char *tempdir = NULL;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
2304
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2305
1757
const char *seckey = PATHDIR "/" SECKEY;
2306
1758
const char *pubkey = PATHDIR "/" PUBKEY;
2307
const char *dh_params_file = NULL;
2308
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
2309
1761
2310
1762
bool gnutls_initialized = false;
2311
1763
bool gpgme_initialized = false;
2363
1815
.doc = "Bit length of the prime number used in the"
2364
1816
" Diffie-Hellman key exchange",
2365
1817
.group = 2 },
2366
{ .name = "dh-params", .key = 134,
2367
.arg = "FILE",
2368
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2369
" for the Diffie-Hellman key exchange",
2370
.group = 2 },
2371
1818
{ .name = "priority", .key = 130,
2372
1819
.arg = "STRING",
2373
1820
.doc = "GnuTLS priority string for the TLS handshake",
2407
1854
connect_to = arg;
2408
1855
break;
2409
1856
case 'i': /* --interface */
2410
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2411
arg, (int)',');
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
2412
1859
if(ret_errno != 0){
2413
1860
argp_error(state, "%s", strerror(ret_errno));
2414
1861
}
2428
1875
}
2429
1876
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2430
1877
break;
2431
case 134: /* --dh-params */
2432
dh_params_file = arg;
2433
break;
2434
1878
case 130: /* --priority */
2435
1879
mc.priority = arg;
2436
1880
break;
2492
1936
goto end;
2493
1937
}
2494
1938
}
2495
1939
2496
1940
{
2497
1941
/* Work around Debian bug #633582:
2498
1942
<http://bugs.debian.org/633582> */
2499
1943
2500
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2502
if(ret_errno != 0){
2503
errno = ret_errno;
2504
perror_plus("Failed to raise privileges");
2505
} else {
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2506
1946
struct stat st;
2507
1947
2508
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2525
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
2526
1966
}
2527
1967
}
2528
1968
2529
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2530
1970
int pubkey_fd = open(pubkey, O_RDONLY);
2531
1971
if(pubkey_fd == -1){
2546
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
2547
1987
}
2548
1988
}
2549
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
TEMP_FAILURE_RETRY(close(dhparams_fd));
2568
}
2569
}
2570
1989
2571
1990
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to lower privileges");
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2576
1995
}
2577
1996
}
2578
1997
}
2579
1998
2580
/* Remove invalid interface names (except "none") */
1999
/* Remove empty interface names */
2581
2000
{
2582
2001
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2002
while((interface = argz_next(interfaces, interfaces_size,
2584
2003
interface))){
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2588
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2589
2007
" \"%s\"\n", interface);
2590
2008
}
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2009
argz_delete(&interfaces, &interfaces_size, interface);
2592
2010
interface = NULL;
2593
2011
}
2594
2012
}
2596
2014
2597
2015
/* Run network hooks */
2598
2016
{
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
2603
goto end;
2604
}
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2607
}
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2610
2028
}
2611
2029
2612
2030
if(not debug){
2617
2035
from the signal handler */
2618
2036
/* Initialize the pseudo-RNG for Avahi */
2619
2037
srand((unsigned int) time(NULL));
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2622
2040
fprintf_plus(stderr,
2623
2041
"Avahi: Failed to create simple poll object.\n");
2624
2042
exitcode = EX_UNAVAILABLE;
2689
2107
}
2690
2108
2691
2109
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2694
2112
/* Look for any good interfaces */
2695
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2696
2114
alphasort);
2697
2115
if(ret >= 1){
2698
2116
/* Add all found interfaces to interfaces list */
2699
2117
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2701
2119
direntries[i]->d_name);
2702
2120
if(ret_errno != 0){
2703
errno = ret_errno;
2704
2121
perror_plus("argz_add");
2705
free(direntries[i]);
2706
2122
continue;
2707
2123
}
2708
2124
if(debug){
2709
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
2126
direntries[i]->d_name);
2711
2127
}
2712
free(direntries[i]);
2713
2128
}
2714
2129
free(direntries);
2715
2130
} else {
2716
if(ret == 0){
2717
free(direntries);
2718
}
2131
free(direntries);
2719
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2720
2133
exitcode = EXIT_FAILURE;
2721
2134
goto end;
2722
2135
}
2723
2136
}
2724
2137
2725
/* Bring up interfaces which are down, and remove any "none"s */
2726
{
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2727
2150
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2151
while((interface = argz_next(interfaces, interfaces_size,
2729
2152
interface))){
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
2742
}
2743
}
2744
break;
2745
}
2746
2153
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2154
ret = bring_up_interface(interface, delay);
2748
2155
if(not interface_was_up){
2749
if(errno != 0){
2750
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2751
" %s\n", interface, strerror(errno));
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2752
2159
} else {
2753
errno = argz_add(&interfaces_to_take_down,
2754
&interfaces_to_take_down_size,
2755
interface);
2756
if(errno != 0){
2757
perror_plus("argz_add");
2758
}
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2759
2163
}
2760
2164
}
2761
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2762
2169
if(debug and (interfaces_to_take_down == NULL)){
2763
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2764
2171
}
2765
2172
}
2766
2173
2767
/* If we only got one interface, explicitly use only that one */
2768
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2769
if(debug){
2770
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2771
mc.interfaces);
2772
}
2773
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2774
}
2775
2776
2174
if(quit_now){
2777
2175
goto end;
2778
2176
}
2779
2177
2780
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2178
ret = init_gnutls_global(pubkey, seckey);
2781
2179
if(ret == -1){
2782
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2783
2181
exitcode = EX_UNAVAILABLE;
2790
2188
goto end;
2791
2189
}
2792
2190
2793
/* Try /run/tmp before /tmp */
2794
tempdir = mkdtemp(run_tempdir);
2795
if(tempdir == NULL and errno == ENOENT){
2796
if(debug){
2797
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2798
run_tempdir, old_tempdir);
2799
}
2800
tempdir = mkdtemp(old_tempdir);
2801
}
2802
if(tempdir == NULL){
2191
if(mkdtemp(tempdir) == NULL){
2803
2192
perror_plus("mkdtemp");
2804
2193
goto end;
2805
2194
}
2195
tempdir_created = true;
2806
2196
2807
2197
if(quit_now){
2808
2198
goto end;
2809
2199
}
2810
2200
2811
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2812
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2813
2203
exitcode = EX_UNAVAILABLE;
2814
2204
goto end;
2844
2234
exitcode = EX_USAGE;
2845
2235
goto end;
2846
2236
}
2847
2237
2848
2238
if(quit_now){
2849
2239
goto end;
2850
2240
}
2871
2261
}
2872
2262
2873
2263
while(not quit_now){
2874
ret = start_mandos_communication(address, port, if_index, af,
2875
&mc);
2264
ret = start_mandos_communication(address, port, if_index, af);
2876
2265
if(quit_now or ret == 0){
2877
2266
break;
2878
2267
}
2880
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2881
2270
(int)retry_interval);
2882
2271
}
2883
sleep((unsigned int)retry_interval);
2272
sleep((int)retry_interval);
2884
2273
}
2885
2274
2886
if(not quit_now){
2275
if (not quit_now){
2887
2276
exitcode = EXIT_SUCCESS;
2888
2277
}
2889
2278
2904
2293
config.publish_domain = 0;
2905
2294
2906
2295
/* Allocate a new server */
2907
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2909
2299
2910
2300
/* Free the Avahi configuration data */
2911
2301
avahi_server_config_free(&config);
2926
2316
/* Create the Avahi service browser */
2927
2317
sb = avahi_s_service_browser_new(mc.server, if_index,
2928
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2929
NULL, 0, browse_callback,
2930
(void *)&mc);
2319
NULL, 0, browse_callback, NULL);
2931
2320
if(sb == NULL){
2932
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2933
2322
avahi_strerror(avahi_server_errno(mc.server)));
2944
2333
if(debug){
2945
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2946
2335
}
2947
2948
ret = avahi_loop_with_timeout(simple_poll,
2949
(int)(retry_interval * 1000), &mc);
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2950
2339
if(debug){
2951
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2952
2341
(ret == 0) ? "successfully" : "with error");
2959
2348
}
2960
2349
2961
2350
/* Cleanup things */
2962
free(mc.interfaces);
2963
2964
2351
if(sb != NULL)
2965
2352
avahi_s_service_browser_free(sb);
2966
2353
2967
2354
if(mc.server != NULL)
2968
2355
avahi_server_free(mc.server);
2969
2356
2970
if(simple_poll != NULL)
2971
avahi_simple_poll_free(simple_poll);
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2972
2359
2973
2360
if(gnutls_initialized){
2974
2361
gnutls_certificate_free_credentials(mc.cred);
2986
2373
mc.current_server->prev->next = NULL;
2987
2374
while(mc.current_server != NULL){
2988
2375
server *next = mc.current_server->next;
2989
#ifdef __GNUC__
2990
#pragma GCC diagnostic push
2991
#pragma GCC diagnostic ignored "-Wcast-qual"
2992
#endif
2993
free((char *)(mc.current_server->ip));
2994
#ifdef __GNUC__
2995
#pragma GCC diagnostic pop
2996
#endif
2997
2376
free(mc.current_server);
2998
2377
mc.current_server = next;
2999
2378
}
3000
2379
}
3001
2380
3002
/* Re-raise privileges */
2381
/* Re-raise priviliges */
3003
2382
{
3004
ret_errno = raise_privileges();
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to raise privileges");
3008
} else {
3009
3010
/* Run network hooks */
3011
run_network_hooks("stop", interfaces_hooks != NULL ?
3012
interfaces_hooks : "", delay);
3013
3014
/* Take down the network interfaces which were brought up */
3015
{
3016
char *interface = NULL;
3017
while((interface=argz_next(interfaces_to_take_down,
3018
interfaces_to_take_down_size,
3019
interface))){
3020
ret_errno = take_down_interface(interface);
3021
if(ret_errno != 0){
3022
errno = ret_errno;
3023
perror_plus("Failed to take down interface");
3024
}
3025
}
3026
if(debug and (interfaces_to_take_down == NULL)){
3027
fprintf_plus(stderr, "No interfaces needed to be taken"
3028
" down\n");
3029
}
3030
}
3031
}
3032
3033
ret_errno = lower_privileges_permanently();
3034
if(ret_errno != 0){
3035
errno = ret_errno;
3036
perror_plus("Failed to lower privileges permanently");
3037
}
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
3038
2407
}
3039
2408
3040
2409
free(interfaces_to_take_down);
3041
2410
free(interfaces_hooks);
3042
2411
3043
2412
/* Removes the GPGME temp directory and all files inside */
3044
if(tempdir != NULL){
2413
if(tempdir_created){
3045
2414
struct dirent **direntries = NULL;
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3047
| O_NOFOLLOW
3048
| O_DIRECTORY
3049
| O_PATH));
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3052
} else {
3053
#ifdef __GLIBC__
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3059
alphasort);
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3068
if(ret == -1){
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3072
}
3073
free(direntries[i]);
3074
}
3075
3076
/* need to clean even if 0 because man page doesn't specify */
3077
free(direntries);
3078
if(numentries == -1){
3079
perror_plus("scandir");
3080
}
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3084
}
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
3085
2434
}
3086
TEMP_FAILURE_RETRY(close(tempdir_fd));
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
3087
2445
}
3088
2446
}
3089
2447
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0