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» Revision
237.7.363
(compared to revision 237.7.149)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2016-03-02 16:45:38 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 335.
- Revision ID: teddy@recompile.se-20160302164538-n9ocll4izthzw1ov
Ignore any error from initramfs-tools' "configure_networking".
* initramfs-tools-script: Wrap call to "configure_networking" with
"set +e" and "set -e", since configure_networking was not designed
to run in a "set -e" environment.
Closes: 816513
Thanks: Carlos Alberto Lopez Perez <clopez@igalia.com>
Thanks: Ben Hutchings <ben@decadent.org.uk>
* initramfs-tools-script: Wrap call to "configure_networking" with
"set +e" and "set -e", since configure_networking was not designed
to run in a "set -e" environment.
Closes: 816513
Thanks: Carlos Alberto Lopez Perez <clopez@igalia.com>
Thanks: Ben Hutchings <ben@decadent.org.uk>
- files added:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
65
70
program_invocation_short_name */
66
71
#include <time.h> /* nanosleep(), time(), sleep() */
67
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
77
*/
73
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
79
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
77
83
#include <iso646.h> /* not, or, and */
78
84
#include <argp.h> /* struct argp_option, error_t, struct
79
85
argp_state, struct argp,
91
97
argz_delete(), argz_append(),
92
98
argz_stringify(), argz_add(),
93
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
94
102
95
103
#ifdef __linux__
96
104
#include <sys/klog.h> /* klogctl() */
138
146
static const char sys_class_net[] = "/sys/class/net";
139
147
char *connect_to = NULL;
140
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
141
150
uid_t uid = 65534;
142
151
gid_t gid = 65534;
143
152
161
170
const char *priority;
162
171
gpgme_ctx_t ctx;
163
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
164
175
} mandos_context;
165
176
166
177
/* global so signal handler can reach it*/
167
178
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
179
172
180
sig_atomic_t quit_now = 0;
173
181
int signal_received = 0;
181
189
perror(print_text);
182
190
}
183
191
184
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
193
int fprintf_plus(FILE *stream, const char *format, ...){
186
194
va_list ap;
187
195
va_start (ap, format);
188
196
189
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
198
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
200
}
193
201
194
202
/*
196
204
* bytes. "buffer_capacity" is how much is currently allocated,
197
205
* "buffer_length" is how much is already used.
198
206
*/
207
__attribute__((nonnull, warn_unused_result))
199
208
size_t incbuffer(char **buffer, size_t buffer_length,
200
209
size_t buffer_capacity){
201
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
if(buffer == NULL){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
204
217
return 0;
205
218
}
219
*buffer = new_buf;
206
220
buffer_capacity += BUFFER_SIZE;
207
221
}
208
222
return buffer_capacity;
209
223
}
210
224
211
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
212
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
228
int af, server **current_server){
214
229
int ret;
215
230
server *new_server = malloc(sizeof(server));
216
231
if(new_server == NULL){
223
238
.af = af };
224
239
if(new_server->ip == NULL){
225
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
226
256
return false;
227
257
}
228
258
/* Special case of first server */
229
if (mc.current_server == NULL){
259
if(*current_server == NULL){
230
260
new_server->next = new_server;
231
261
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
262
*current_server = new_server;
234
263
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
237
267
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
268
(*current_server)->prev = new_server;
244
269
}
245
270
return true;
246
271
}
248
273
/*
249
274
* Initialize GPGME.
250
275
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
253
281
gpgme_error_t rc;
254
282
gpgme_engine_info_t engine_info;
255
283
256
284
/*
257
285
* Helper function to insert pub and seckey to the engine keyring.
258
286
*/
259
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
260
288
int ret;
261
289
int fd;
262
290
gpgme_data_t pgp_data;
274
302
return false;
275
303
}
276
304
277
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
278
306
if(rc != GPG_ERR_NO_ERROR){
279
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
308
gpgme_strsource(rc), gpgme_strerror(rc));
281
309
return false;
282
310
}
283
311
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
285
313
if(ret == -1){
286
314
perror_plus("close");
287
315
}
324
352
}
325
353
326
354
/* Create new GPGME "context" */
327
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
328
356
if(rc != GPG_ERR_NO_ERROR){
329
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
371
* Decrypt OpenPGP data.
344
372
* Returns -1 on error
345
373
*/
374
__attribute__((nonnull, warn_unused_result))
346
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
347
376
size_t crypto_size,
348
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
349
379
gpgme_data_t dh_crypto, dh_plain;
350
380
gpgme_error_t rc;
351
381
ssize_t ret;
377
407
378
408
/* Decrypt data from the cryptotext data buffer to the plaintext
379
409
data buffer */
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
411
if(rc != GPG_ERR_NO_ERROR){
382
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
413
gpgme_strsource(rc), gpgme_strerror(rc));
384
414
plaintext_length = -1;
385
415
if(debug){
386
416
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
388
418
if(result == NULL){
389
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
420
} else {
467
497
return plaintext_length;
468
498
}
469
499
470
static const char * safer_gnutls_strerror(int value){
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
471
509
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
510
return safe_string(ret);
475
511
}
476
512
477
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
478
515
static void debuggnutls(__attribute__((unused)) int level,
479
516
const char* string){
480
517
fprintf_plus(stderr, "GnuTLS: %s", string);
481
518
}
482
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
521
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
485
525
int ret;
526
unsigned int uret;
486
527
487
528
if(debug){
488
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
530
}
490
531
491
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
495
return -1;
496
}
497
498
532
if(debug){
499
533
/* "Use a log level over 10 to enable all debugging options."
500
534
* - GnuTLS manual
504
538
}
505
539
506
540
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
508
542
if(ret != GNUTLS_E_SUCCESS){
509
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
544
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
512
545
return -1;
513
546
}
514
547
520
553
}
521
554
522
555
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
524
557
GNUTLS_OPENPGP_FMT_BASE64);
525
558
if(ret != GNUTLS_E_SUCCESS){
526
559
fprintf_plus(stderr,
532
565
}
533
566
534
567
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
536
569
if(ret != GNUTLS_E_SUCCESS){
537
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
571
" initialization: %s\n",
539
572
safer_gnutls_strerror(ret));
540
573
goto globalfail;
541
574
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
748
551
749
return 0;
552
750
553
751
globalfail:
554
752
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
558
755
return -1;
559
756
}
560
757
561
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
562
761
int ret;
563
762
/* GnuTLS session creation */
564
763
do {
576
775
{
577
776
const char *err;
578
777
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
779
if(quit_now){
581
780
gnutls_deinit(*session);
582
781
return -1;
593
792
594
793
do {
595
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
795
mc->cred);
597
796
if(quit_now){
598
797
gnutls_deinit(*session);
599
798
return -1;
609
808
/* ignore client certificate if any. */
610
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
810
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
811
return 0;
615
812
}
616
813
618
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
816
__attribute__((unused)) const char *txt){}
620
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
621
1036
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
622
1038
static int start_mandos_communication(const char *ip, in_port_t port,
623
1039
AvahiIfIndex if_index,
624
int af){
1040
int af, mandos_context *mc){
625
1041
int ret, tcp_sd = -1;
626
1042
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1043
struct sockaddr_storage to;
631
1044
char *buffer = NULL;
632
1045
char *decrypted_buffer = NULL;
633
1046
size_t buffer_length = 0;
636
1049
int retval = -1;
637
1050
gnutls_session_t session;
638
1051
int pf; /* Protocol family */
1052
bool route_added = false;
639
1053
640
1054
errno = 0;
641
1055
657
1071
return -1;
658
1072
}
659
1073
660
ret = init_gnutls_session(&session);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
661
1107
if(ret != 0){
662
1108
return -1;
663
1109
}
667
1113
PRIuMAX "\n", ip, (uintmax_t)port);
668
1114
}
669
1115
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1117
if(tcp_sd < 0){
672
1118
int e = errno;
673
1119
perror_plus("socket");
680
1126
goto mandos_end;
681
1127
}
682
1128
683
memset(&to, 0, sizeof(to));
684
1129
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1133
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
690
1137
}
691
1138
if(ret < 0 ){
692
1139
int e = errno;
701
1148
goto mandos_end;
702
1149
}
703
1150
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1154
if(if_index == AVAHI_IF_UNSPEC){
709
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1156
" incomplete without a network interface\n");
712
1158
goto mandos_end;
713
1159
}
714
1160
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1162
}
717
1163
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1165
}
722
1166
723
1167
if(quit_now){
740
1184
}
741
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
782
1267
}
783
1268
784
1269
const char *out = mandos_protocol_version;
935
1420
if(buffer_length > 0){
936
1421
ssize_t decrypted_buffer_size;
937
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
1423
&decrypted_buffer, mc);
939
1424
if(decrypted_buffer_size >= 0){
940
1425
941
1426
written = 0;
967
1452
968
1453
mandos_end:
969
1454
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
970
1461
int e = errno;
971
1462
free(decrypted_buffer);
972
1463
free(buffer);
973
1464
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
975
1466
}
976
1467
if(ret == -1){
977
1468
if(e == 0){
989
1480
return retval;
990
1481
}
991
1482
1483
__attribute__((nonnull))
992
1484
static void resolve_callback(AvahiSServiceResolver *r,
993
1485
AvahiIfIndex interface,
994
1486
AvahiProtocol proto,
1002
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1496
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1497
void *mc){
1006
1498
if(r == NULL){
1007
1499
return;
1008
1500
}
1011
1503
timed out */
1012
1504
1013
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1014
1507
return;
1015
1508
}
1016
1509
1020
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1515
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
1024
1518
break;
1025
1519
1026
1520
case AVAHI_RESOLVER_FOUND:
1034
1528
}
1035
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
1530
interface,
1037
avahi_proto_to_af(proto));
1531
avahi_proto_to_af(proto),
1532
mc);
1038
1533
if(ret == 0){
1039
1534
avahi_simple_poll_quit(simple_poll);
1040
1535
} else {
1041
1536
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1043
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1540
" list\n", name);
1045
1541
}
1058
1554
const char *domain,
1059
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1556
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1557
void *mc){
1062
1558
if(b == NULL){
1063
1559
return;
1064
1560
}
1075
1571
case AVAHI_BROWSER_FAILURE:
1076
1572
1077
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1079
1576
avahi_simple_poll_quit(simple_poll);
1080
1577
return;
1081
1578
1085
1582
the callback function is called the Avahi server will free the
1086
1583
resolver for us. */
1087
1584
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1091
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
1590
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1094
1593
break;
1095
1594
1096
1595
case AVAHI_BROWSER_REMOVE:
1121
1620
errno = old_errno;
1122
1621
}
1123
1622
1623
__attribute__((nonnull, warn_unused_result))
1124
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
1625
int ret;
1126
1626
error_t ret_errno;
1132
1632
errno = ret_errno;
1133
1633
return false;
1134
1634
}
1135
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1136
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
1638
if(ret == -1){
1138
1639
if(debug){
1145
1646
return true;
1146
1647
}
1147
1648
1649
__attribute__((nonnull, warn_unused_result))
1148
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1651
1150
1652
/* Reject the loopback device */
1192
1694
* corresponds to an acceptable network device.
1193
1695
* (This function is passed to scandir(3) as a filter function.)
1194
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1195
1698
int good_interface(const struct dirent *if_entry){
1196
1699
if(if_entry->d_name[0] == '.'){
1197
1700
return 0;
1215
1718
/*
1216
1719
* This function determines if a network interface is up.
1217
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1218
1722
bool interface_is_up(const char *interface){
1219
1723
struct ifreq ifr;
1220
1724
if(not get_flags(interface, &ifr)){
1231
1735
/*
1232
1736
* This function determines if a network interface is running
1233
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1234
1739
bool interface_is_running(const char *interface){
1235
1740
struct ifreq ifr;
1236
1741
if(not get_flags(interface, &ifr)){
1244
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1750
}
1246
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1247
1753
int notdotentries(const struct dirent *direntry){
1248
1754
/* Skip "." and ".." */
1249
1755
if(direntry->d_name[0] == '.'
1256
1762
}
1257
1763
1258
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1259
1766
int runnable_hook(const struct dirent *direntry){
1260
1767
int ret;
1261
1768
size_t sret;
1269
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1777
"abcdefghijklmnopqrstuvwxyz"
1271
1778
"0123456789"
1272
"_-");
1779
"_.-");
1273
1780
if((direntry->d_name)[sret] != '\0'){
1274
1781
/* Contains non-allowed characters */
1275
1782
if(debug){
1279
1786
return 0;
1280
1787
}
1281
1788
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1790
if(ret == -1){
1291
1791
if(debug){
1292
1792
perror_plus("Could not stat hook");
1316
1816
return 1;
1317
1817
}
1318
1818
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1320
1822
int ret;
1321
1823
struct timespec now;
1322
1824
struct timespec waited_time;
1323
1825
intmax_t block_time;
1324
1826
1325
1827
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1828
if(mc->current_server == NULL){
1829
if(debug){
1328
1830
fprintf_plus(stderr, "Wait until first server is found."
1329
1831
" No timeout!\n");
1330
1832
}
1331
1833
ret = avahi_simple_poll_iterate(s, -1);
1332
1834
} else {
1333
if (debug){
1835
if(debug){
1334
1836
fprintf_plus(stderr, "Check current_server if we should run"
1335
1837
" it, or wait\n");
1336
1838
}
1343
1845
/* Calculating in ms how long time between now and server
1344
1846
who we visted longest time ago. Now - last seen. */
1345
1847
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1848
- mc->current_server->last_seen.tv_sec);
1347
1849
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1850
- mc->current_server->last_seen.tv_nsec);
1349
1851
/* total time is 10s/10,000ms.
1350
1852
Converting to s from ms by dividing by 1,000,
1351
1853
and ns to ms by dividing by 1,000,000. */
1353
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1354
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1857
1356
if (debug){
1858
if(debug){
1357
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
1860
block_time);
1359
1861
}
1360
1862
1361
1863
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1366
1868
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1869
avahi_simple_poll_quit(s);
1368
1870
return 0;
1369
1871
}
1370
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1873
&mc->current_server->last_seen);
1372
1874
if(ret == -1){
1373
1875
perror_plus("clock_gettime");
1374
1876
return -1;
1375
1877
}
1376
mc.current_server = mc.current_server->next;
1878
mc->current_server = mc->current_server->next;
1377
1879
block_time = 0; /* Call avahi to find new Mandos
1378
1880
servers, but don't block */
1379
1881
}
1381
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
1884
}
1383
1885
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1385
1887
return (ret != 1) ? ret : 0;
1386
1888
}
1387
1889
}
1388
1890
}
1389
1891
}
1390
1892
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1444
1895
const float delay){
1445
struct dirent **direntries;
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1914
if(numhooks == -1){
1915
perror_plus("scandir");
1916
return;
1917
}
1446
1918
struct dirent *direntry;
1447
1919
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1458
1930
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1466
1977
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1525
1982
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
1537
2051
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
1574
2071
}
1575
2072
2073
__attribute__((nonnull, warn_unused_result))
1576
2074
error_t bring_up_interface(const char *const interface,
1577
2075
const float delay){
1578
int sd = -1;
1579
2076
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
2077
int ret;
1582
2078
struct ifreq network;
1583
2079
unsigned int if_index = if_nametoindex(interface);
1584
2080
if(if_index == 0){
1593
2089
}
1594
2090
1595
2091
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
1597
2094
ret_errno = errno;
1598
2095
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2096
"\"%s\"\n", interface);
2097
errno = old_errno;
1600
2098
return ret_errno;
1601
2099
}
1602
network.ifr_flags |= IFF_UP;
2100
network.ifr_flags |= IFF_UP; /* set flag */
1603
2101
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
1606
2104
ret_errno = errno;
1607
2105
perror_plus("socket");
1608
2106
errno = old_errno;
1609
2107
return ret_errno;
1610
2108
}
1611
2109
1612
2110
if(quit_now){
1613
close(sd);
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
1614
2115
errno = old_errno;
1615
2116
return EINTR;
1616
2117
}
1620
2121
interface);
1621
2122
}
1622
2123
1623
/* Raise priviliges */
1624
raise_privileges();
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
1625
2130
1626
2131
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
1634
2143
}
1635
2144
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
1638
2147
#ifdef __linux__
1639
2148
if(restore_loglevel){
1640
2149
ret_linux = klogctl(7, NULL, 0);
1644
2153
}
1645
2154
#endif /* __linux__ */
1646
2155
1647
/* Lower privileges */
1648
lower_privileges();
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
1649
2165
1650
2166
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
ret = close(sd);
1652
2168
if(ret == -1){
1653
2169
perror_plus("close");
1654
2170
}
1655
2171
1656
2172
if(ret_setflags == -1){
1657
errno = ret_errno;
2173
errno = ioctl_errno;
1658
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2175
errno = old_errno;
1660
return ret_errno;
2176
return ioctl_errno;
1661
2177
}
1662
2178
} else if(debug){
1663
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1681
2197
return 0;
1682
2198
}
1683
2199
2200
__attribute__((nonnull, warn_unused_result))
1684
2201
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
2202
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
2203
struct ifreq network;
1690
2204
unsigned int if_index = if_nametoindex(interface);
1691
2205
if(if_index == 0){
1694
2208
return ENXIO;
1695
2209
}
1696
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
1697
2212
if(not get_flags(interface, &network) and debug){
1698
2213
ret_errno = errno;
1699
2214
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2215
"\"%s\"\n", interface);
2216
errno = old_errno;
1701
2217
return ret_errno;
1702
2218
}
1703
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2220
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
1707
2223
ret_errno = errno;
1708
2224
perror_plus("socket");
1709
2225
errno = old_errno;
1715
2231
interface);
1716
2232
}
1717
2233
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
2240
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2243
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
1726
2253
1727
2254
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2255
int ret = close(sd);
1729
2256
if(ret == -1){
1730
2257
perror_plus("close");
1731
2258
}
1732
2259
1733
2260
if(ret_setflags == -1){
1734
errno = ret_errno;
2261
errno = ioctl_errno;
1735
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2263
errno = old_errno;
1737
return ret_errno;
2264
return ioctl_errno;
1738
2265
}
1739
2266
} else if(debug){
1740
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2273
}
1747
2274
1748
2275
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
1749
2281
AvahiSServiceBrowser *sb = NULL;
1750
2282
error_t ret_errno;
1751
2283
int ret;
1752
2284
intmax_t tmpmax;
1753
2285
char *tmp;
1754
2286
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2287
char *interfaces_to_take_down = NULL;
1758
2288
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1761
2292
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2293
const char *seckey = PATHDIR "/" SECKEY;
1763
2294
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
1764
2296
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2297
1767
2298
bool gnutls_initialized = false;
1768
2299
bool gpgme_initialized = false;
1820
2351
.doc = "Bit length of the prime number used in the"
1821
2352
" Diffie-Hellman key exchange",
1822
2353
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
1823
2359
{ .name = "priority", .key = 130,
1824
2360
.arg = "STRING",
1825
2361
.doc = "GnuTLS priority string for the TLS handshake",
1859
2395
connect_to = arg;
1860
2396
break;
1861
2397
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2399
arg, (int)',');
1864
2400
if(ret_errno != 0){
1865
2401
argp_error(state, "%s", strerror(ret_errno));
1866
2402
}
1880
2416
}
1881
2417
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2418
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
1883
2422
case 130: /* --priority */
1884
2423
mc.priority = arg;
1885
2424
break;
1941
2480
goto end;
1942
2481
}
1943
2482
}
1944
2483
1945
2484
{
1946
2485
/* Work around Debian bug #633582:
1947
2486
<http://bugs.debian.org/633582> */
1948
2487
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
2493
} else {
1951
2494
struct stat st;
1952
2495
1953
2496
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2510
}
1968
2511
}
1969
2512
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2513
close(seckey_fd);
1971
2514
}
1972
2515
}
1973
2516
1974
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2518
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2519
if(pubkey_fd == -1){
1988
2531
}
1989
2532
}
1990
2533
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
1995
2560
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2000
2565
}
2001
2566
}
2002
2567
}
2003
2568
2004
/* Remove empty interface names */
2569
/* Remove invalid interface names (except "none") */
2005
2570
{
2006
2571
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2573
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2011
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2578
" \"%s\"\n", interface);
2013
2579
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2581
interface = NULL;
2016
2582
}
2017
2583
}
2019
2585
2020
2586
/* Run network hooks */
2021
2587
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2025
2590
if(interfaces_hooks == NULL){
2026
2591
perror_plus("malloc");
2027
2592
goto end;
2028
2593
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
2038
2599
}
2039
2600
2040
2601
if(not debug){
2117
2678
}
2118
2679
2119
2680
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2122
2683
/* Look for any good interfaces */
2123
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2685
alphasort);
2125
2686
if(ret >= 1){
2126
2687
/* Add all found interfaces to interfaces list */
2127
2688
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2690
direntries[i]->d_name);
2130
2691
if(ret_errno != 0){
2692
errno = ret_errno;
2131
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2132
2695
continue;
2133
2696
}
2134
2697
if(debug){
2135
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2699
direntries[i]->d_name);
2137
2700
}
2701
free(direntries[i]);
2138
2702
}
2139
2703
free(direntries);
2140
2704
} else {
2141
free(direntries);
2705
if(ret == 0){
2706
free(direntries);
2707
}
2142
2708
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2709
exitcode = EXIT_FAILURE;
2144
2710
goto end;
2145
2711
}
2146
2712
}
2147
2713
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2714
/* Bring up interfaces which are down, and remove any "none"s */
2715
{
2160
2716
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2718
interface))){
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2723
interface);
2724
interface = NULL;
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2729
interface);
2730
interface = NULL;
2731
}
2732
}
2733
break;
2734
}
2163
2735
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2736
errno = bring_up_interface(interface, delay);
2165
2737
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2169
2741
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
if(errno != 0){
2746
perror_plus("argz_add");
2747
}
2173
2748
}
2174
2749
}
2175
2750
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2751
if(debug and (interfaces_to_take_down == NULL)){
2180
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2753
}
2182
2754
}
2183
2755
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2758
if(debug){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2760
mc.interfaces);
2761
}
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2763
}
2764
2184
2765
if(quit_now){
2185
2766
goto end;
2186
2767
}
2187
2768
2188
ret = init_gnutls_global(pubkey, seckey);
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2189
2770
if(ret == -1){
2190
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
2772
exitcode = EX_UNAVAILABLE;
2198
2779
goto end;
2199
2780
}
2200
2781
2201
if(mkdtemp(tempdir) == NULL){
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
2202
2792
perror_plus("mkdtemp");
2203
2793
goto end;
2204
2794
}
2205
tempdir_created = true;
2206
2795
2207
2796
if(quit_now){
2208
2797
goto end;
2209
2798
}
2210
2799
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2800
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
2801
fprintf_plus(stderr, "init_gpgme failed\n");
2213
2802
exitcode = EX_UNAVAILABLE;
2214
2803
goto end;
2244
2833
exitcode = EX_USAGE;
2245
2834
goto end;
2246
2835
}
2247
2836
2248
2837
if(quit_now){
2249
2838
goto end;
2250
2839
}
2271
2860
}
2272
2861
2273
2862
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2863
ret = start_mandos_communication(address, port, if_index, af,
2864
&mc);
2275
2865
if(quit_now or ret == 0){
2276
2866
break;
2277
2867
}
2279
2869
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
2870
(int)retry_interval);
2281
2871
}
2282
sleep((int)retry_interval);
2872
sleep((unsigned int)retry_interval);
2283
2873
}
2284
2874
2285
if (not quit_now){
2875
if(not quit_now){
2286
2876
exitcode = EXIT_SUCCESS;
2287
2877
}
2288
2878
2325
2915
/* Create the Avahi service browser */
2326
2916
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
2917
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2918
NULL, 0, browse_callback,
2919
(void *)&mc);
2329
2920
if(sb == NULL){
2330
2921
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
2922
avahi_strerror(avahi_server_errno(mc.server)));
2342
2933
if(debug){
2343
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
2935
}
2345
2936
2346
2937
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2938
(int)(retry_interval * 1000), &mc);
2348
2939
if(debug){
2349
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
2941
(ret == 0) ? "successfully" : "with error");
2357
2948
}
2358
2949
2359
2950
/* Cleanup things */
2951
free(mc.interfaces);
2952
2360
2953
if(sb != NULL)
2361
2954
avahi_s_service_browser_free(sb);
2362
2955
2368
2961
2369
2962
if(gnutls_initialized){
2370
2963
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2372
2964
gnutls_dh_params_deinit(mc.dh_params);
2373
2965
}
2374
2966
2382
2974
mc.current_server->prev->next = NULL;
2383
2975
while(mc.current_server != NULL){
2384
2976
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2385
2985
free(mc.current_server);
2386
2986
mc.current_server = next;
2387
2987
}
2388
2988
}
2389
2989
2390
/* Re-raise priviliges */
2990
/* Re-raise privileges */
2391
2991
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
3019
}
3020
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
3025
}
2417
3026
}
2418
3027
2419
3028
free(interfaces_to_take_down);
2420
3029
free(interfaces_hooks);
2421
3030
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
3033
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
3085
}
3086
2422
3087
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
2431
char *fullname = NULL;
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
direntry->d_name);
2434
if(ret < 0){
2435
perror_plus("asprintf");
2436
continue;
2437
}
2438
ret = remove(fullname);
2439
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
2442
}
2443
free(fullname);
2444
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
2451
}
2452
ret = rmdir(tempdir);
2453
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
2455
}
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
2456
3090
}
2457
3091
2458
3092
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0