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- Committer: Teddy Hogeborn
- Date: 2012-06-14 21:42:44 UTC
- Revision ID: teddy@recompile.se-20120614214244-meh2hr7pg0p0fek2
* plugins.d/mandos-client.c: Only print message about nonexisting
network hook directory in debug mode.
network hook directory in debug mode.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
56
55
opendir(), DIR */
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
71
65
program_invocation_short_name */
72
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
72
*/
79
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
74
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
84
77
#include <iso646.h> /* not, or, and */
85
78
#include <argp.h> /* struct argp_option, error_t, struct
86
79
argp_state, struct argp,
98
91
argz_delete(), argz_append(),
99
92
argz_stringify(), argz_add(),
100
93
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
94
104
95
#ifdef __linux__
105
96
#include <sys/klog.h> /* klogctl() */
147
138
static const char sys_class_net[] = "/sys/class/net";
148
139
char *connect_to = NULL;
149
140
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
141
uid_t uid = 65534;
152
142
gid_t gid = 65534;
153
143
164
154
165
155
/* Used for passing in values through the Avahi callback functions */
166
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
167
158
AvahiServer *server;
168
159
gnutls_certificate_credentials_t cred;
169
160
unsigned int dh_bits;
171
162
const char *priority;
172
163
gpgme_ctx_t ctx;
173
164
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
176
165
} mandos_context;
177
166
178
/* global so signal handler can reach it*/
179
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 };
180
172
181
173
sig_atomic_t quit_now = 0;
182
174
int signal_received = 0;
190
182
perror(print_text);
191
183
}
192
184
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
194
186
int fprintf_plus(FILE *stream, const char *format, ...){
195
187
va_list ap;
196
188
va_start (ap, format);
197
189
198
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
191
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
193
}
202
194
203
195
/*
205
197
* bytes. "buffer_capacity" is how much is currently allocated,
206
198
* "buffer_length" is how much is already used.
207
199
*/
208
__attribute__((nonnull, warn_unused_result))
209
200
size_t incbuffer(char **buffer, size_t buffer_length,
210
201
size_t buffer_capacity){
211
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
218
205
return 0;
219
206
}
220
*buffer = new_buf;
221
207
buffer_capacity += BUFFER_SIZE;
222
208
}
223
209
return buffer_capacity;
224
210
}
225
211
226
212
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
214
int af){
230
215
int ret;
231
216
server *new_server = malloc(sizeof(server));
232
217
if(new_server == NULL){
239
224
.af = af };
240
225
if(new_server->ip == NULL){
241
226
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
227
return false;
258
228
}
259
229
/* Special case of first server */
260
if(*current_server == NULL){
230
if (mc.current_server == NULL){
261
231
new_server->next = new_server;
262
232
new_server->prev = new_server;
263
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
264
235
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
268
238
new_server->prev->next = new_server;
269
(*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;
270
245
}
271
246
return true;
272
247
}
274
249
/*
275
250
* Initialize GPGME.
276
251
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
282
254
gpgme_error_t rc;
283
255
gpgme_engine_info_t engine_info;
284
256
257
285
258
/*
286
259
* Helper function to insert pub and seckey to the engine keyring.
287
260
*/
288
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
289
262
int ret;
290
263
int fd;
291
264
gpgme_data_t pgp_data;
303
276
return false;
304
277
}
305
278
306
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
307
280
if(rc != GPG_ERR_NO_ERROR){
308
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
282
gpgme_strsource(rc), gpgme_strerror(rc));
310
283
return false;
311
284
}
312
285
313
ret = close(fd);
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
287
if(ret == -1){
315
288
perror_plus("close");
316
289
}
353
326
}
354
327
355
328
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
357
330
if(rc != GPG_ERR_NO_ERROR){
358
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
372
345
* Decrypt OpenPGP data.
373
346
* Returns -1 on error
374
347
*/
375
__attribute__((nonnull, warn_unused_result))
376
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
349
size_t crypto_size,
378
char **plaintext,
379
mandos_context *mc){
350
char **plaintext){
380
351
gpgme_data_t dh_crypto, dh_plain;
381
352
gpgme_error_t rc;
382
353
ssize_t ret;
408
379
409
380
/* Decrypt data from the cryptotext data buffer to the plaintext
410
381
data buffer */
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
383
if(rc != GPG_ERR_NO_ERROR){
413
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
385
gpgme_strsource(rc), gpgme_strerror(rc));
415
386
plaintext_length = -1;
416
387
if(debug){
417
388
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
419
390
if(result == NULL){
420
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
421
392
} else {
498
469
return plaintext_length;
499
470
}
500
471
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
472
static const char * safer_gnutls_strerror(int value){
510
473
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
512
477
}
513
478
514
479
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
480
static void debuggnutls(__attribute__((unused)) int level,
517
481
const char* string){
518
482
fprintf_plus(stderr, "GnuTLS: %s", string);
519
483
}
520
484
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
485
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
486
const char *seckeyfilename){
526
487
int ret;
527
unsigned int uret;
528
488
529
489
if(debug){
530
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
491
}
532
492
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
497
return -1;
498
}
499
533
500
if(debug){
534
501
/* "Use a log level over 10 to enable all debugging options."
535
502
* - GnuTLS manual
539
506
}
540
507
541
508
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
510
if(ret != GNUTLS_E_SUCCESS){
544
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
512
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
546
514
return -1;
547
515
}
548
516
554
522
}
555
523
556
524
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
558
526
GNUTLS_OPENPGP_FMT_BASE64);
559
527
if(ret != GNUTLS_E_SUCCESS){
560
528
fprintf_plus(stderr,
566
534
}
567
535
568
536
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
570
538
if(ret != GNUTLS_E_SUCCESS){
571
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
540
" initialization: %s\n",
573
541
safer_gnutls_strerror(ret));
574
542
goto globalfail;
575
543
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
748
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);
749
552
750
553
return 0;
751
554
752
555
globalfail:
753
556
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
756
560
return -1;
757
561
}
758
562
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
761
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
762
564
int ret;
763
565
/* GnuTLS session creation */
764
566
do {
776
578
{
777
579
const char *err;
778
580
do {
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
582
if(quit_now){
781
583
gnutls_deinit(*session);
782
584
return -1;
793
595
794
596
do {
795
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
796
mc->cred);
598
mc.cred);
797
599
if(quit_now){
798
600
gnutls_deinit(*session);
799
601
return -1;
809
611
/* ignore client certificate if any. */
810
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
811
613
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
812
616
return 0;
813
617
}
814
618
816
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
817
621
__attribute__((unused)) const char *txt){}
818
622
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
1037
623
/* Called when a Mandos server is found */
1038
__attribute__((nonnull, warn_unused_result))
1039
624
static int start_mandos_communication(const char *ip, in_port_t port,
1040
625
AvahiIfIndex if_index,
1041
int af, mandos_context *mc){
626
int af){
1042
627
int ret, tcp_sd = -1;
1043
628
ssize_t sret;
1044
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1045
633
char *buffer = NULL;
1046
634
char *decrypted_buffer = NULL;
1047
635
size_t buffer_length = 0;
1050
638
int retval = -1;
1051
639
gnutls_session_t session;
1052
640
int pf; /* Protocol family */
1053
bool route_added = false;
1054
641
1055
642
errno = 0;
1056
643
1072
659
return -1;
1073
660
}
1074
661
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1078
bool match = false;
1079
{
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
interface))){
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1084
match = true;
1085
break;
1086
}
1087
}
1088
}
1089
if(not match){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1092
if(debug){
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1096
} else {
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
" \"%s\"\n",
1099
if_indextoname((unsigned int)if_index,
1100
interface));
1101
}
1102
}
1103
return -1;
1104
}
1105
}
1106
1107
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
1108
663
if(ret != 0){
1109
664
return -1;
1110
665
}
1114
669
PRIuMAX "\n", ip, (uintmax_t)port);
1115
670
}
1116
671
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1118
673
if(tcp_sd < 0){
1119
674
int e = errno;
1120
675
perror_plus("socket");
1127
682
goto mandos_end;
1128
683
}
1129
684
685
memset(&to, 0, sizeof(to));
1130
686
if(af == AF_INET6){
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
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);
1134
689
} else { /* IPv4 */
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
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);
1138
692
}
1139
693
if(ret < 0 ){
1140
694
int e = errno;
1149
703
goto mandos_end;
1150
704
}
1151
705
if(af == AF_INET6){
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((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*/
1155
710
if(if_index == AVAHI_IF_UNSPEC){
1156
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1157
712
" incomplete without a network interface\n");
1159
714
goto mandos_end;
1160
715
}
1161
716
/* Set the network interface number as scope */
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1163
718
}
1164
719
} else {
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1166
723
}
1167
724
1168
725
if(quit_now){
1185
742
}
1186
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1187
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
if(af == AF_INET6){
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
} else {
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1197
NI_NUMERICHOST);
1198
}
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1205
}
1206
}
1207
1208
if(quit_now){
1209
errno = EINTR;
1210
goto mandos_end;
1211
}
1212
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
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;
1268
784
}
1269
785
1270
786
const char *out = mandos_protocol_version;
1421
937
if(buffer_length > 0){
1422
938
ssize_t decrypted_buffer_size;
1423
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1424
&decrypted_buffer, mc);
940
&decrypted_buffer);
1425
941
if(decrypted_buffer_size >= 0){
1426
942
1427
clearerr(stdout);
1428
943
written = 0;
1429
944
while(written < (size_t) decrypted_buffer_size){
1430
945
if(quit_now){
1446
961
}
1447
962
written += (size_t)ret;
1448
963
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1459
964
retval = 0;
1460
965
}
1461
966
}
1464
969
1465
970
mandos_end:
1466
971
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
1473
972
int e = errno;
1474
973
free(decrypted_buffer);
1475
974
free(buffer);
1476
975
if(tcp_sd >= 0){
1477
ret = close(tcp_sd);
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1478
977
}
1479
978
if(ret == -1){
1480
979
if(e == 0){
1492
991
return retval;
1493
992
}
1494
993
1495
__attribute__((nonnull))
1496
994
static void resolve_callback(AvahiSServiceResolver *r,
1497
995
AvahiIfIndex interface,
1498
996
AvahiProtocol proto,
1506
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1507
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1508
1006
flags,
1509
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1510
1008
if(r == NULL){
1511
1009
return;
1512
1010
}
1515
1013
timed out */
1516
1014
1517
1015
if(quit_now){
1518
avahi_s_service_resolver_free(r);
1519
1016
return;
1520
1017
}
1521
1018
1525
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1526
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1527
1024
domain,
1528
avahi_strerror(avahi_server_errno
1529
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1530
1026
break;
1531
1027
1532
1028
case AVAHI_RESOLVER_FOUND:
1540
1036
}
1541
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
1038
interface,
1543
avahi_proto_to_af(proto),
1544
mc);
1039
avahi_proto_to_af(proto));
1545
1040
if(ret == 0){
1546
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1547
1042
} else {
1548
1043
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1551
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1552
1046
" list\n", name);
1553
1047
}
1566
1060
const char *domain,
1567
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1568
1062
flags,
1569
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1570
1064
if(b == NULL){
1571
1065
return;
1572
1066
}
1583
1077
case AVAHI_BROWSER_FAILURE:
1584
1078
1585
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1586
avahi_strerror(avahi_server_errno
1587
(((mandos_context*)mc)->server)));
1588
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1589
1082
return;
1590
1083
1591
1084
case AVAHI_BROWSER_NEW:
1594
1087
the callback function is called the Avahi server will free the
1595
1088
resolver for us. */
1596
1089
1597
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1598
interface, protocol, name, type,
1599
domain, protocol, 0,
1600
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)
1601
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1602
1094
" %s\n", name,
1603
avahi_strerror(avahi_server_errno
1604
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1605
1096
break;
1606
1097
1607
1098
case AVAHI_BROWSER_REMOVE:
1626
1117
signal_received = sig;
1627
1118
int old_errno = errno;
1628
1119
/* set main loop to exit */
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1631
1122
}
1632
1123
errno = old_errno;
1633
1124
}
1634
1125
1635
__attribute__((nonnull, warn_unused_result))
1636
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1637
1127
int ret;
1638
int old_errno;
1128
error_t ret_errno;
1639
1129
1640
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1641
1131
if(s < 0){
1642
old_errno = errno;
1132
ret_errno = errno;
1643
1133
perror_plus("socket");
1644
errno = old_errno;
1134
errno = ret_errno;
1645
1135
return false;
1646
1136
}
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1137
strcpy(ifr->ifr_name, ifname);
1649
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1650
1139
if(ret == -1){
1651
1140
if(debug){
1652
old_errno = errno;
1141
ret_errno = errno;
1653
1142
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1143
errno = ret_errno;
1655
1144
}
1656
1145
return false;
1657
1146
}
1658
1147
return true;
1659
1148
}
1660
1149
1661
__attribute__((nonnull, warn_unused_result))
1662
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
1151
1664
1152
/* Reject the loopback device */
1706
1194
* corresponds to an acceptable network device.
1707
1195
* (This function is passed to scandir(3) as a filter function.)
1708
1196
*/
1709
__attribute__((nonnull, warn_unused_result))
1710
1197
int good_interface(const struct dirent *if_entry){
1711
1198
if(if_entry->d_name[0] == '.'){
1712
1199
return 0;
1730
1217
/*
1731
1218
* This function determines if a network interface is up.
1732
1219
*/
1733
__attribute__((nonnull, warn_unused_result))
1734
1220
bool interface_is_up(const char *interface){
1735
1221
struct ifreq ifr;
1736
1222
if(not get_flags(interface, &ifr)){
1747
1233
/*
1748
1234
* This function determines if a network interface is running
1749
1235
*/
1750
__attribute__((nonnull, warn_unused_result))
1751
1236
bool interface_is_running(const char *interface){
1752
1237
struct ifreq ifr;
1753
1238
if(not get_flags(interface, &ifr)){
1761
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1762
1247
}
1763
1248
1764
__attribute__((nonnull, pure, warn_unused_result))
1765
1249
int notdotentries(const struct dirent *direntry){
1766
1250
/* Skip "." and ".." */
1767
1251
if(direntry->d_name[0] == '.'
1774
1258
}
1775
1259
1776
1260
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1778
1261
int runnable_hook(const struct dirent *direntry){
1779
1262
int ret;
1780
1263
size_t sret;
1788
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
1272
"abcdefghijklmnopqrstuvwxyz"
1790
1273
"0123456789"
1791
"_.-");
1274
"_-");
1792
1275
if((direntry->d_name)[sret] != '\0'){
1793
1276
/* Contains non-allowed characters */
1794
1277
if(debug){
1798
1281
return 0;
1799
1282
}
1800
1283
1801
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);
1802
1292
if(ret == -1){
1803
1293
if(debug){
1804
1294
perror_plus("Could not stat hook");
1828
1318
return 1;
1829
1319
}
1830
1320
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1834
1322
int ret;
1835
1323
struct timespec now;
1836
1324
struct timespec waited_time;
1837
1325
intmax_t block_time;
1838
1326
1839
1327
while(true){
1840
if(mc->current_server == NULL){
1841
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1842
1330
fprintf_plus(stderr, "Wait until first server is found."
1843
1331
" No timeout!\n");
1844
1332
}
1845
1333
ret = avahi_simple_poll_iterate(s, -1);
1846
1334
} else {
1847
if(debug){
1335
if (debug){
1848
1336
fprintf_plus(stderr, "Check current_server if we should run"
1849
1337
" it, or wait\n");
1850
1338
}
1857
1345
/* Calculating in ms how long time between now and server
1858
1346
who we visted longest time ago. Now - last seen. */
1859
1347
waited_time.tv_sec = (now.tv_sec
1860
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1861
1349
waited_time.tv_nsec = (now.tv_nsec
1862
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1863
1351
/* total time is 10s/10,000ms.
1864
1352
Converting to s from ms by dividing by 1,000,
1865
1353
and ns to ms by dividing by 1,000,000. */
1867
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1868
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1869
1357
1870
if(debug){
1358
if (debug){
1871
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1872
1360
block_time);
1873
1361
}
1874
1362
1875
1363
if(block_time <= 0){
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
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);
1880
1368
if(ret == 0){
1881
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1882
1370
return 0;
1883
1371
}
1884
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1885
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1886
1374
if(ret == -1){
1887
1375
perror_plus("clock_gettime");
1888
1376
return -1;
1889
1377
}
1890
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1891
1379
block_time = 0; /* Call avahi to find new Mandos
1892
1380
servers, but don't block */
1893
1381
}
1895
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1896
1384
}
1897
1385
if(ret != 0){
1898
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1899
1387
return (ret != 1) ? ret : 0;
1900
1388
}
1901
1389
}
1902
1390
}
1903
1391
}
1904
1392
1905
__attribute__((nonnull))
1906
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,
1907
1446
const float delay){
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1914
if(debug){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1917
}
1918
} else {
1919
perror_plus("open");
1920
}
1921
return;
1922
}
1923
}
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1926
1452
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1942
1460
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1989
1468
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1994
1527
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = close(devnull);
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
2063
1539
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
2083
1576
}
2084
1577
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2089
int ret;
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2090
1584
struct ifreq network;
2091
1585
unsigned int if_index = if_nametoindex(interface);
2092
1586
if(if_index == 0){
2101
1595
}
2102
1596
2103
1597
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
1598
if(not get_flags(interface, &network) and debug){
2107
1599
ret_errno = errno;
2108
1600
fprintf_plus(stderr, "Failed to get flags for interface "
2109
1601
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
1602
return ret_errno;
2112
1603
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
1604
network.ifr_flags |= IFF_UP;
2114
1605
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2117
1608
ret_errno = errno;
2118
1609
perror_plus("socket");
2119
1610
errno = old_errno;
2120
1611
return ret_errno;
2121
1612
}
2122
1613
2123
1614
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
1615
close(sd);
2128
1616
errno = old_errno;
2129
1617
return EINTR;
2130
1618
}
2134
1622
interface);
2135
1623
}
2136
1624
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
}
1625
/* Raise priviliges */
1626
raise_privileges();
2143
1627
2144
1628
#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
}
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
2156
1636
}
2157
1637
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2160
1640
#ifdef __linux__
2161
1641
if(restore_loglevel){
2162
1642
ret_linux = klogctl(7, NULL, 0);
2166
1646
}
2167
1647
#endif /* __linux__ */
2168
1648
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
}
1649
/* Lower privileges */
1650
lower_privileges();
2178
1651
2179
1652
/* Close the socket */
2180
ret = close(sd);
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
1654
if(ret == -1){
2182
1655
perror_plus("close");
2183
1656
}
2184
1657
2185
1658
if(ret_setflags == -1){
2186
errno = ioctl_errno;
1659
errno = ret_errno;
2187
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
1661
errno = old_errno;
2189
return ioctl_errno;
1662
return ret_errno;
2190
1663
}
2191
1664
} else if(debug){
2192
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2210
1683
return 0;
2211
1684
}
2212
1685
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2216
1691
struct ifreq network;
2217
1692
unsigned int if_index = if_nametoindex(interface);
2218
1693
if(if_index == 0){
2221
1696
return ENXIO;
2222
1697
}
2223
1698
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
1699
if(not get_flags(interface, &network) and debug){
2227
1700
ret_errno = errno;
2228
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2229
1702
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
1703
return ret_errno;
2232
1704
}
2233
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
1706
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2237
1709
ret_errno = errno;
2238
1710
perror_plus("socket");
2239
1711
errno = old_errno;
2245
1717
interface);
2246
1718
}
2247
1719
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
2267
1728
2268
1729
/* Close the socket */
2269
int ret = close(sd);
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1731
if(ret == -1){
2271
1732
perror_plus("close");
2272
1733
}
2273
1734
2274
1735
if(ret_setflags == -1){
2275
errno = ioctl_errno;
1736
errno = ret_errno;
2276
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
1738
errno = old_errno;
2278
return ioctl_errno;
1739
return ret_errno;
2279
1740
}
2280
1741
} else if(debug){
2281
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2287
1748
}
2288
1749
2289
1750
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
1751
AvahiSServiceBrowser *sb = NULL;
2296
1752
error_t ret_errno;
2297
1753
int ret;
2298
1754
intmax_t tmpmax;
2299
1755
char *tmp;
2300
1756
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
2301
1759
char *interfaces_to_take_down = NULL;
2302
1760
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2306
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1764
const char *seckey = PATHDIR "/" SECKEY;
2308
1765
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
2311
1768
2312
1769
bool gnutls_initialized = false;
2313
1770
bool gpgme_initialized = false;
2365
1822
.doc = "Bit length of the prime number used in the"
2366
1823
" Diffie-Hellman key exchange",
2367
1824
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1825
{ .name = "priority", .key = 130,
2374
1826
.arg = "STRING",
2375
1827
.doc = "GnuTLS priority string for the TLS handshake",
2409
1861
connect_to = arg;
2410
1862
break;
2411
1863
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2414
1866
if(ret_errno != 0){
2415
1867
argp_error(state, "%s", strerror(ret_errno));
2416
1868
}
2430
1882
}
2431
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1884
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1885
case 130: /* --priority */
2437
1886
mc.priority = arg;
2438
1887
break;
2478
1927
.args_doc = "",
2479
1928
.doc = "Mandos client -- Get and decrypt"
2480
1929
" passwords from a Mandos server" };
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2484
1933
case 0:
2485
1934
break;
2486
1935
case ENOMEM:
2487
1936
default:
2488
errno = ret_errno;
1937
errno = ret;
2489
1938
perror_plus("argp_parse");
2490
1939
exitcode = EX_OSERR;
2491
1940
goto end;
2494
1943
goto end;
2495
1944
}
2496
1945
}
2497
1946
2498
1947
{
2499
1948
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
1949
<http://bugs.debian.org/633582> */
2501
1950
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
perror_plus("Failed to raise privileges");
2507
} else {
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2508
1953
struct stat st;
2509
1954
2510
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2524
1969
}
2525
1970
}
2526
1971
}
2527
close(seckey_fd);
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
1973
}
2529
1974
}
2530
1975
2531
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
1977
int pubkey_fd = open(pubkey, O_RDONLY);
2533
1978
if(pubkey_fd == -1){
2545
1990
}
2546
1991
}
2547
1992
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
2574
1997
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
perror_plus("Failed to lower privileges");
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2579
2002
}
2580
2003
}
2581
2004
}
2582
2005
2583
/* Remove invalid interface names (except "none") */
2006
/* Remove empty interface names */
2584
2007
{
2585
2008
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2009
while((interface = argz_next(interfaces, interfaces_size,
2587
2010
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2591
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2592
2014
" \"%s\"\n", interface);
2593
2015
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2016
argz_delete(&interfaces, &interfaces_size, interface);
2595
2017
interface = NULL;
2596
2018
}
2597
2019
}
2599
2021
2600
2022
/* Run network hooks */
2601
2023
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
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);
2024
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2025
interfaces, interfaces_size);
2026
if(ret_errno != 0){
2027
errno = ret_errno;
2028
perror_plus("argz_append");
2029
goto end;
2030
}
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2032
if(not run_network_hooks("start", interfaces_hooks, delay)){
2033
goto end;
2034
}
2613
2035
}
2614
2036
2615
2037
if(not debug){
2620
2042
from the signal handler */
2621
2043
/* Initialize the pseudo-RNG for Avahi */
2622
2044
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2045
mc.simple_poll = avahi_simple_poll_new();
2046
if(mc.simple_poll == NULL){
2625
2047
fprintf_plus(stderr,
2626
2048
"Avahi: Failed to create simple poll object.\n");
2627
2049
exitcode = EX_UNAVAILABLE;
2692
2114
}
2693
2115
2694
2116
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2117
if(interfaces == NULL){
2118
struct dirent **direntries;
2697
2119
/* Look for any good interfaces */
2698
2120
ret = scandir(sys_class_net, &direntries, good_interface,
2699
2121
alphasort);
2700
2122
if(ret >= 1){
2701
2123
/* Add all found interfaces to interfaces list */
2702
2124
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2125
ret_errno = argz_add(&interfaces, &interfaces_size,
2704
2126
direntries[i]->d_name);
2705
2127
if(ret_errno != 0){
2706
errno = ret_errno;
2707
2128
perror_plus("argz_add");
2708
free(direntries[i]);
2709
2129
continue;
2710
2130
}
2711
2131
if(debug){
2712
2132
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
2133
direntries[i]->d_name);
2714
2134
}
2715
free(direntries[i]);
2716
2135
}
2717
2136
free(direntries);
2718
2137
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2138
free(direntries);
2722
2139
fprintf_plus(stderr, "Could not find a network interface\n");
2723
2140
exitcode = EXIT_FAILURE;
2724
2141
goto end;
2725
2142
}
2726
2143
}
2727
2144
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2145
/* If we only got one interface, explicitly use only that one */
2146
if(argz_count(interfaces, interfaces_size) == 1){
2147
if(debug){
2148
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2149
interfaces);
2150
}
2151
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2152
}
2153
2154
/* Bring up interfaces which are down */
2155
if(not (argz_count(interfaces, interfaces_size) == 1
2156
and strcmp(interfaces, "none") == 0)){
2730
2157
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2158
while((interface = argz_next(interfaces, interfaces_size,
2732
2159
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
2160
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2161
ret = bring_up_interface(interface, delay);
2751
2162
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2163
if(ret != 0){
2164
errno = ret;
2165
perror_plus("Failed to bring up interface");
2755
2166
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2167
ret_errno = argz_add(&interfaces_to_take_down,
2168
&interfaces_to_take_down_size,
2169
interface);
2762
2170
}
2763
2171
}
2764
2172
}
2173
free(interfaces);
2174
interfaces = NULL;
2175
interfaces_size = 0;
2765
2176
if(debug and (interfaces_to_take_down == NULL)){
2766
2177
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
2178
}
2768
2179
}
2769
2180
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2777
}
2778
2779
2181
if(quit_now){
2780
2182
goto end;
2781
2183
}
2782
2184
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2185
ret = init_gnutls_global(pubkey, seckey);
2784
2186
if(ret == -1){
2785
2187
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
2188
exitcode = EX_UNAVAILABLE;
2793
2195
goto end;
2794
2196
}
2795
2197
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){
2198
if(mkdtemp(tempdir) == NULL){
2806
2199
perror_plus("mkdtemp");
2807
2200
goto end;
2808
2201
}
2202
tempdir_created = true;
2809
2203
2810
2204
if(quit_now){
2811
2205
goto end;
2812
2206
}
2813
2207
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2208
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
2209
fprintf_plus(stderr, "init_gpgme failed\n");
2816
2210
exitcode = EX_UNAVAILABLE;
2817
2211
goto end;
2847
2241
exitcode = EX_USAGE;
2848
2242
goto end;
2849
2243
}
2850
2244
2851
2245
if(quit_now){
2852
2246
goto end;
2853
2247
}
2874
2268
}
2875
2269
2876
2270
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2271
ret = start_mandos_communication(address, port, if_index, af);
2879
2272
if(quit_now or ret == 0){
2880
2273
break;
2881
2274
}
2883
2276
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
2277
(int)retry_interval);
2885
2278
}
2886
sleep((unsigned int)retry_interval);
2279
sleep((int)retry_interval);
2887
2280
}
2888
2281
2889
if(not quit_now){
2282
if (not quit_now){
2890
2283
exitcode = EXIT_SUCCESS;
2891
2284
}
2892
2285
2907
2300
config.publish_domain = 0;
2908
2301
2909
2302
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
2303
mc.server = avahi_server_new(avahi_simple_poll_get
2304
(mc.simple_poll), &config, NULL,
2305
NULL, &ret_errno);
2912
2306
2913
2307
/* Free the Avahi configuration data */
2914
2308
avahi_server_config_free(&config);
2917
2311
/* Check if creating the Avahi server object succeeded */
2918
2312
if(mc.server == NULL){
2919
2313
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2314
avahi_strerror(ret_errno));
2921
2315
exitcode = EX_UNAVAILABLE;
2922
2316
goto end;
2923
2317
}
2929
2323
/* Create the Avahi service browser */
2930
2324
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
2325
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2326
NULL, 0, browse_callback, NULL);
2934
2327
if(sb == NULL){
2935
2328
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
2329
avahi_strerror(avahi_server_errno(mc.server)));
2947
2340
if(debug){
2948
2341
fprintf_plus(stderr, "Starting Avahi loop search\n");
2949
2342
}
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2343
2344
ret = avahi_loop_with_timeout(mc.simple_poll,
2345
(int)(retry_interval * 1000));
2953
2346
if(debug){
2954
2347
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
2348
(ret == 0) ? "successfully" : "with error");
2958
2351
end:
2959
2352
2960
2353
if(debug){
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
2354
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
2355
}
2969
2356
2970
2357
/* Cleanup things */
2971
free(mc.interfaces);
2972
2973
2358
if(sb != NULL)
2974
2359
avahi_s_service_browser_free(sb);
2975
2360
2976
2361
if(mc.server != NULL)
2977
2362
avahi_server_free(mc.server);
2978
2363
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
2364
if(mc.simple_poll != NULL)
2365
avahi_simple_poll_free(mc.simple_poll);
2981
2366
2982
2367
if(gnutls_initialized){
2983
2368
gnutls_certificate_free_credentials(mc.cred);
2369
gnutls_global_deinit();
2984
2370
gnutls_dh_params_deinit(mc.dh_params);
2985
2371
}
2986
2372
2994
2380
mc.current_server->prev->next = NULL;
2995
2381
while(mc.current_server != NULL){
2996
2382
server *next = mc.current_server->next;
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3000
#endif
3001
free((char *)(mc.current_server->ip));
3002
#ifdef __GNUC__
3003
#pragma GCC diagnostic pop
3004
#endif
3005
2383
free(mc.current_server);
3006
2384
mc.current_server = next;
3007
2385
}
3008
2386
}
3009
2387
3010
/* Re-raise privileges */
2388
/* Re-raise priviliges */
3011
2389
{
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3015
perror_plus("Failed to raise privileges");
3016
} else {
3017
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3021
3022
/* Take down the network interfaces which were brought up */
3023
{
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3027
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3031
perror_plus("Failed to take down interface");
3032
}
3033
}
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3036
" down\n");
3037
}
3038
}
3039
}
3040
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3044
perror_plus("Failed to lower privileges permanently");
3045
}
2390
raise_privileges();
2391
2392
/* Run network hooks */
2393
run_network_hooks("stop", interfaces_hooks, delay);
2394
2395
/* Take down the network interfaces which were brought up */
2396
{
2397
char *interface = NULL;
2398
while((interface=argz_next(interfaces_to_take_down,
2399
interfaces_to_take_down_size,
2400
interface))){
2401
ret_errno = take_down_interface(interface);
2402
if(ret_errno != 0){
2403
errno = ret_errno;
2404
perror_plus("Failed to take down interface");
2405
}
2406
}
2407
if(debug and (interfaces_to_take_down == NULL)){
2408
fprintf_plus(stderr, "No interfaces needed to be taken"
2409
" down\n");
2410
}
2411
}
2412
2413
lower_privileges_permanently();
3046
2414
}
3047
2415
3048
2416
free(interfaces_to_take_down);
3049
2417
free(interfaces_hooks);
3050
2418
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
2419
/* Removes the GPGME temp directory and all files inside */
2420
if(tempdir_created){
3053
2421
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
2422
struct dirent *direntry = NULL;
2423
int numentries = scandir(tempdir, &direntries, notdotentries,
2424
alphasort);
2425
if (numentries > 0){
3066
2426
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3107
/* Removes the GPGME temp directory and all files inside */
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
2427
direntry = direntries[i];
2428
char *fullname = NULL;
2429
ret = asprintf(&fullname, "%s/%s", tempdir,
2430
direntry->d_name);
2431
if(ret < 0){
2432
perror_plus("asprintf");
2433
continue;
2434
}
2435
ret = remove(fullname);
2436
if(ret == -1){
2437
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2438
strerror(errno));
2439
}
2440
free(fullname);
2441
}
2442
}
2443
2444
/* need to clean even if 0 because man page doesn't specify */
2445
free(direntries);
2446
if (numentries == -1){
2447
perror_plus("scandir");
2448
}
2449
ret = rmdir(tempdir);
2450
if(ret == -1 and errno != ENOENT){
2451
perror_plus("rmdir");
2452
}
3110
2453
}
3111
2454
3112
2455
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0