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- Committer: Teddy Hogeborn
- Date: 2018-04-01 22:08:50 UTC
- Revision ID: teddy@recompile.se-20180401220850-11kc7596lknn4piy
Check for and report GPGME key import errors
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
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
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
138
148
static const char sys_class_net[] = "/sys/class/net";
139
149
char *connect_to = NULL;
140
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
141
152
uid_t uid = 65534;
142
153
gid_t gid = 65534;
143
154
180
191
perror(print_text);
181
192
}
182
193
183
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
195
int fprintf_plus(FILE *stream, const char *format, ...){
185
196
va_list ap;
186
197
va_start (ap, format);
187
198
188
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
200
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
202
}
192
203
193
204
/*
195
206
* bytes. "buffer_capacity" is how much is currently allocated,
196
207
* "buffer_length" is how much is already used.
197
208
*/
209
__attribute__((nonnull, warn_unused_result))
198
210
size_t incbuffer(char **buffer, size_t buffer_length,
199
211
size_t buffer_capacity){
200
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
203
219
return 0;
204
220
}
221
*buffer = new_buf;
205
222
buffer_capacity += BUFFER_SIZE;
206
223
}
207
224
return buffer_capacity;
208
225
}
209
226
210
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
211
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
230
int af, server **current_server){
213
231
int ret;
222
240
.af = af };
223
241
if(new_server->ip == NULL){
224
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
225
258
return false;
226
259
}
227
260
/* Special case of first server */
229
262
new_server->next = new_server;
230
263
new_server->prev = new_server;
231
264
*current_server = new_server;
232
/* Place the new server last in the list */
233
265
} else {
266
/* Place the new server last in the list */
234
267
new_server->next = *current_server;
235
268
new_server->prev = (*current_server)->prev;
236
269
new_server->prev->next = new_server;
237
270
(*current_server)->prev = new_server;
238
271
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
272
return true;
245
273
}
246
274
247
275
/*
248
276
* Initialize GPGME.
249
277
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
252
283
gpgme_error_t rc;
253
284
gpgme_engine_info_t engine_info;
254
285
255
286
/*
256
287
* Helper function to insert pub and seckey to the engine keyring.
257
288
*/
258
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
259
290
int ret;
260
291
int fd;
261
292
gpgme_data_t pgp_data;
279
310
gpgme_strsource(rc), gpgme_strerror(rc));
280
311
return false;
281
312
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
282
388
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
284
390
if(ret == -1){
285
391
perror_plus("close");
286
392
}
325
431
/* Create new GPGME "context" */
326
432
rc = gpgme_new(&(mc->ctx));
327
433
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
331
436
return false;
332
437
}
333
438
342
447
* Decrypt OpenPGP data.
343
448
* Returns -1 on error
344
449
*/
450
__attribute__((nonnull, warn_unused_result))
345
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
452
size_t crypto_size,
347
453
char **plaintext,
368
474
/* Create new empty GPGME data buffer for the plaintext */
369
475
rc = gpgme_data_new(&dh_plain);
370
476
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
373
478
gpgme_strsource(rc), gpgme_strerror(rc));
374
479
gpgme_data_release(dh_crypto);
375
480
return -1;
388
493
if(result == NULL){
389
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
495
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
395
502
if(result->file_name != NULL){
396
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
504
}
467
574
return plaintext_length;
468
575
}
469
576
470
static const char * safer_gnutls_strerror(int value){
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
471
586
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
587
return safe_string(ret);
475
588
}
476
589
477
590
/* GnuTLS log function callback */
591
__attribute__((nonnull))
478
592
static void debuggnutls(__attribute__((unused)) int level,
479
593
const char* string){
480
594
fprintf_plus(stderr, "GnuTLS: %s", string);
481
595
}
482
596
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
598
static int init_gnutls_global(const char *pubkeyfilename,
484
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
485
601
mandos_context *mc){
486
602
int ret;
603
unsigned int uret;
487
604
488
605
if(debug){
489
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
607
}
491
608
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
499
609
if(debug){
500
610
/* "Use a log level over 10 to enable all debugging options."
501
611
* - GnuTLS manual
509
619
if(ret != GNUTLS_E_SUCCESS){
510
620
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
621
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
622
return -1;
514
623
}
515
624
540
649
safer_gnutls_strerror(ret));
541
650
goto globalfail;
542
651
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
550
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
830
552
831
return 0;
554
833
globalfail:
555
834
556
835
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
836
gnutls_dh_params_deinit(mc->dh_params);
559
837
return -1;
560
838
}
561
839
840
__attribute__((nonnull, warn_unused_result))
562
841
static int init_gnutls_session(gnutls_session_t *session,
563
842
mandos_context *mc){
564
843
int ret;
611
890
/* ignore client certificate if any. */
612
891
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
892
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
893
return 0;
617
894
}
618
895
620
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
898
__attribute__((unused)) const char *txt){}
622
899
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
623
1118
/* Called when a Mandos server is found */
1119
__attribute__((nonnull, warn_unused_result))
624
1120
static int start_mandos_communication(const char *ip, in_port_t port,
625
1121
AvahiIfIndex if_index,
626
1122
int af, mandos_context *mc){
627
1123
int ret, tcp_sd = -1;
628
1124
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1125
struct sockaddr_storage to;
633
1126
char *buffer = NULL;
634
1127
char *decrypted_buffer = NULL;
635
1128
size_t buffer_length = 0;
638
1131
int retval = -1;
639
1132
gnutls_session_t session;
640
1133
int pf; /* Protocol family */
1134
bool route_added = false;
641
1135
642
1136
errno = 0;
643
1137
665
1159
bool match = false;
666
1160
{
667
1161
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
670
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
671
1166
match = true;
672
1167
break;
701
1196
PRIuMAX "\n", ip, (uintmax_t)port);
702
1197
}
703
1198
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
705
1200
if(tcp_sd < 0){
706
1201
int e = errno;
707
1202
perror_plus("socket");
714
1209
goto mandos_end;
715
1210
}
716
1211
717
memset(&to, 0, sizeof(to));
718
1212
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
721
1216
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
724
1220
}
725
1221
if(ret < 0 ){
726
1222
int e = errno;
735
1231
goto mandos_end;
736
1232
}
737
1233
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
1237
if(if_index == AVAHI_IF_UNSPEC){
743
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
744
1239
" incomplete without a network interface\n");
746
1241
goto mandos_end;
747
1242
}
748
1243
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
1245
}
751
1246
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
1248
}
756
1249
757
1250
if(quit_now){
774
1267
}
775
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
1269
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
816
1350
}
817
1351
818
1352
const char *out = mandos_protocol_version;
972
1506
&decrypted_buffer, mc);
973
1507
if(decrypted_buffer_size >= 0){
974
1508
1509
clearerr(stdout);
975
1510
written = 0;
976
1511
while(written < (size_t) decrypted_buffer_size){
977
1512
if(quit_now){
993
1528
}
994
1529
written += (size_t)ret;
995
1530
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
996
1541
retval = 0;
997
1542
}
998
1543
}
1001
1546
1002
1547
mandos_end:
1003
1548
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1004
1555
int e = errno;
1005
1556
free(decrypted_buffer);
1006
1557
free(buffer);
1007
1558
if(tcp_sd >= 0){
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1559
ret = close(tcp_sd);
1009
1560
}
1010
1561
if(ret == -1){
1011
1562
if(e == 0){
1036
1587
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1588
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1589
flags,
1039
void* mc){
1590
void *mc){
1040
1591
if(r == NULL){
1041
1592
return;
1042
1593
}
1045
1596
timed out */
1046
1597
1047
1598
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1048
1600
return;
1049
1601
}
1050
1602
1095
1647
const char *domain,
1096
1648
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1649
flags,
1098
void* mc){
1650
void *mc){
1099
1651
if(b == NULL){
1100
1652
return;
1101
1653
}
1161
1713
errno = old_errno;
1162
1714
}
1163
1715
1716
__attribute__((nonnull, warn_unused_result))
1164
1717
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1718
int ret;
1166
error_t ret_errno;
1719
int old_errno;
1167
1720
1168
1721
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1722
if(s < 0){
1170
ret_errno = errno;
1723
old_errno = errno;
1171
1724
perror_plus("socket");
1172
errno = ret_errno;
1725
errno = old_errno;
1173
1726
return false;
1174
1727
}
1175
strcpy(ifr->ifr_name, ifname);
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1176
1730
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1731
if(ret == -1){
1178
1732
if(debug){
1179
ret_errno = errno;
1733
old_errno = errno;
1180
1734
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1182
1741
}
1183
1742
return false;
1184
1743
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1185
1749
return true;
1186
1750
}
1187
1751
1752
__attribute__((nonnull, warn_unused_result))
1188
1753
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1754
1190
1755
/* Reject the loopback device */
1232
1797
* corresponds to an acceptable network device.
1233
1798
* (This function is passed to scandir(3) as a filter function.)
1234
1799
*/
1800
__attribute__((nonnull, warn_unused_result))
1235
1801
int good_interface(const struct dirent *if_entry){
1236
1802
if(if_entry->d_name[0] == '.'){
1237
1803
return 0;
1255
1821
/*
1256
1822
* This function determines if a network interface is up.
1257
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1258
1825
bool interface_is_up(const char *interface){
1259
1826
struct ifreq ifr;
1260
1827
if(not get_flags(interface, &ifr)){
1271
1838
/*
1272
1839
* This function determines if a network interface is running
1273
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1274
1842
bool interface_is_running(const char *interface){
1275
1843
struct ifreq ifr;
1276
1844
if(not get_flags(interface, &ifr)){
1284
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1853
}
1286
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1287
1856
int notdotentries(const struct dirent *direntry){
1288
1857
/* Skip "." and ".." */
1289
1858
if(direntry->d_name[0] == '.'
1296
1865
}
1297
1866
1298
1867
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1299
1869
int runnable_hook(const struct dirent *direntry){
1300
1870
int ret;
1301
1871
size_t sret;
1309
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1880
"abcdefghijklmnopqrstuvwxyz"
1311
1881
"0123456789"
1312
"_-");
1882
"_.-");
1313
1883
if((direntry->d_name)[sret] != '\0'){
1314
1884
/* Contains non-allowed characters */
1315
1885
if(debug){
1319
1889
return 0;
1320
1890
}
1321
1891
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1330
1893
if(ret == -1){
1331
1894
if(debug){
1332
1895
perror_plus("Could not stat hook");
1356
1919
return 1;
1357
1920
}
1358
1921
1922
__attribute__((nonnull, warn_unused_result))
1359
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1924
mandos_context *mc){
1361
1925
int ret;
1365
1929
1366
1930
while(true){
1367
1931
if(mc->current_server == NULL){
1368
if (debug){
1932
if(debug){
1369
1933
fprintf_plus(stderr, "Wait until first server is found."
1370
1934
" No timeout!\n");
1371
1935
}
1372
1936
ret = avahi_simple_poll_iterate(s, -1);
1373
1937
} else {
1374
if (debug){
1938
if(debug){
1375
1939
fprintf_plus(stderr, "Check current_server if we should run"
1376
1940
" it, or wait\n");
1377
1941
}
1394
1958
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1959
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1960
1397
if (debug){
1961
if(debug){
1398
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1963
block_time);
1400
1964
}
1422
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1987
}
1424
1988
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1989
if(ret > 0 or errno != EINTR){
1426
1990
return (ret != 1) ? ret : 0;
1427
1991
}
1428
1992
}
1429
1993
}
1430
1994
}
1431
1995
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1485
1998
const float delay){
1486
struct dirent **direntries;
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2022
if(numhooks == -1){
2023
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
1487
2027
struct dirent *direntry;
1488
2028
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
1499
2034
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
1507
2081
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
1566
2086
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
1578
2155
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
1615
2175
}
1616
2176
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
1623
2182
struct ifreq network;
1624
2183
unsigned int if_index = if_nametoindex(interface);
1625
2184
if(if_index == 0){
1634
2193
}
1635
2194
1636
2195
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
1638
2199
ret_errno = errno;
1639
2200
fprintf_plus(stderr, "Failed to get flags for interface "
1640
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
1641
2203
return ret_errno;
1642
2204
}
1643
network.ifr_flags |= IFF_UP;
2205
network.ifr_flags |= IFF_UP; /* set flag */
1644
2206
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
1647
2209
ret_errno = errno;
1648
2210
perror_plus("socket");
1649
2211
errno = old_errno;
1650
2212
return ret_errno;
1651
2213
}
1652
2214
1653
2215
if(quit_now){
1654
close(sd);
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
1655
2220
errno = old_errno;
1656
2221
return EINTR;
1657
2222
}
1661
2226
interface);
1662
2227
}
1663
2228
1664
/* Raise priviliges */
1665
raise_privileges();
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
1666
2235
1667
2236
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
1675
2248
}
1676
2249
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
1679
2252
#ifdef __linux__
1680
2253
if(restore_loglevel){
1681
2254
ret_linux = klogctl(7, NULL, 0);
1685
2258
}
1686
2259
#endif /* __linux__ */
1687
2260
1688
/* Lower privileges */
1689
lower_privileges();
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
1690
2270
1691
2271
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2272
ret = close(sd);
1693
2273
if(ret == -1){
1694
2274
perror_plus("close");
1695
2275
}
1696
2276
1697
2277
if(ret_setflags == -1){
1698
errno = ret_errno;
2278
errno = ioctl_errno;
1699
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
2280
errno = old_errno;
1701
return ret_errno;
2281
return ioctl_errno;
1702
2282
}
1703
2283
} else if(debug){
1704
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1707
2287
1708
2288
/* Sleep checking until interface is running.
1709
2289
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
2290
for(int i = 0; i < delay * 4; i++){
1711
2291
if(interface_is_running(interface)){
1712
2292
break;
1713
2293
}
1722
2302
return 0;
1723
2303
}
1724
2304
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
1730
2308
struct ifreq network;
1731
2309
unsigned int if_index = if_nametoindex(interface);
1732
2310
if(if_index == 0){
1735
2313
return ENXIO;
1736
2314
}
1737
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
1738
2318
if(not get_flags(interface, &network) and debug){
1739
2319
ret_errno = errno;
1740
2320
fprintf_plus(stderr, "Failed to get flags for interface "
1741
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
1742
2323
return ret_errno;
1743
2324
}
1744
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
2326
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
1748
2329
ret_errno = errno;
1749
2330
perror_plus("socket");
1750
2331
errno = old_errno;
1756
2337
interface);
1757
2338
}
1758
2339
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
1767
2359
1768
2360
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2361
int ret = close(sd);
1770
2362
if(ret == -1){
1771
2363
perror_plus("close");
1772
2364
}
1773
2365
1774
2366
if(ret_setflags == -1){
1775
errno = ret_errno;
2367
errno = ioctl_errno;
1776
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
2369
errno = old_errno;
1778
return ret_errno;
2370
return ioctl_errno;
1779
2371
}
1780
2372
} else if(debug){
1781
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
2379
}
1788
2380
1789
2381
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
1794
2387
AvahiSServiceBrowser *sb = NULL;
1795
2388
error_t ret_errno;
1796
2389
int ret;
1799
2392
int exitcode = EXIT_SUCCESS;
1800
2393
char *interfaces_to_take_down = NULL;
1801
2394
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1804
2398
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
2399
const char *seckey = PATHDIR "/" SECKEY;
1806
2400
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
1807
2402
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
2403
1810
2404
bool gnutls_initialized = false;
1811
2405
bool gpgme_initialized = false;
1863
2457
.doc = "Bit length of the prime number used in the"
1864
2458
" Diffie-Hellman key exchange",
1865
2459
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
1866
2465
{ .name = "priority", .key = 130,
1867
2466
.arg = "STRING",
1868
2467
.doc = "GnuTLS priority string for the TLS handshake",
1923
2522
}
1924
2523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1925
2524
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
1926
2528
case 130: /* --priority */
1927
2529
mc.priority = arg;
1928
2530
break;
1968
2570
.args_doc = "",
1969
2571
.doc = "Mandos client -- Get and decrypt"
1970
2572
" passwords from a Mandos server" };
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
1974
2576
case 0:
1975
2577
break;
1976
2578
case ENOMEM:
1977
2579
default:
1978
errno = ret;
2580
errno = ret_errno;
1979
2581
perror_plus("argp_parse");
1980
2582
exitcode = EX_OSERR;
1981
2583
goto end;
1984
2586
goto end;
1985
2587
}
1986
2588
}
1987
2589
1988
2590
{
1989
2591
/* Work around Debian bug #633582:
1990
<http://bugs.debian.org/633582> */
2592
<https://bugs.debian.org/633582> */
1991
2593
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
2599
} else {
1994
2600
struct stat st;
1995
2601
1996
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2010
2616
}
2011
2617
}
2012
2618
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2619
close(seckey_fd);
2014
2620
}
2015
2621
}
2016
2622
2017
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2019
2625
if(pubkey_fd == -1){
2031
2637
}
2032
2638
}
2033
2639
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2038
2666
/* Lower privileges */
2039
lower_privileges();
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2040
2672
}
2041
2673
}
2042
2674
2066
2698
goto end;
2067
2699
}
2068
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
2077
2705
}
2078
2706
2079
2707
if(not debug){
2157
2785
2158
2786
/* If no interfaces were specified, make a list */
2159
2787
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2788
struct dirent **direntries = NULL;
2161
2789
/* Look for any good interfaces */
2162
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2163
2791
alphasort);
2167
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2796
direntries[i]->d_name);
2169
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2170
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2171
2801
continue;
2172
2802
}
2173
2803
if(debug){
2174
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
2805
direntries[i]->d_name);
2176
2806
}
2807
free(direntries[i]);
2177
2808
}
2178
2809
free(direntries);
2179
2810
} else {
2180
free(direntries);
2811
if(ret == 0){
2812
free(direntries);
2813
}
2181
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2182
2815
exitcode = EXIT_FAILURE;
2183
2816
goto end;
2206
2839
break;
2207
2840
}
2208
2841
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2842
errno = bring_up_interface(interface, delay);
2210
2843
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2214
2847
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2218
2854
}
2219
2855
}
2220
2856
}
2236
2872
goto end;
2237
2873
}
2238
2874
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2240
2876
if(ret == -1){
2241
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2878
exitcode = EX_UNAVAILABLE;
2249
2885
goto end;
2250
2886
}
2251
2887
2252
if(mkdtemp(tempdir) == NULL){
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
2253
2898
perror_plus("mkdtemp");
2254
2899
goto end;
2255
2900
}
2256
tempdir_created = true;
2257
2901
2258
2902
if(quit_now){
2259
2903
goto end;
2331
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
2976
(int)retry_interval);
2333
2977
}
2334
sleep((int)retry_interval);
2978
sleep((unsigned int)retry_interval);
2335
2979
}
2336
2980
2337
if (not quit_now){
2981
if(not quit_now){
2338
2982
exitcode = EXIT_SUCCESS;
2339
2983
}
2340
2984
2356
3000
2357
3001
/* Allocate a new server */
2358
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
3003
&config, NULL, NULL, &ret);
2360
3004
2361
3005
/* Free the Avahi configuration data */
2362
3006
avahi_server_config_free(&config);
2365
3009
/* Check if creating the Avahi server object succeeded */
2366
3010
if(mc.server == NULL){
2367
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
3012
avahi_strerror(ret));
2369
3013
exitcode = EX_UNAVAILABLE;
2370
3014
goto end;
2371
3015
}
2395
3039
if(debug){
2396
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
3041
}
2398
3042
2399
3043
ret = avahi_loop_with_timeout(simple_poll,
2400
3044
(int)(retry_interval * 1000), &mc);
2401
3045
if(debug){
2406
3050
end:
2407
3051
2408
3052
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
2410
3060
}
2411
3061
2412
3062
/* Cleanup things */
2423
3073
2424
3074
if(gnutls_initialized){
2425
3075
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2427
3076
gnutls_dh_params_deinit(mc.dh_params);
2428
3077
}
2429
3078
2437
3086
mc.current_server->prev->next = NULL;
2438
3087
while(mc.current_server != NULL){
2439
3088
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
2440
3097
free(mc.current_server);
2441
3098
mc.current_server = next;
2442
3099
}
2443
3100
}
2444
3101
2445
/* Re-raise priviliges */
3102
/* Re-raise privileges */
2446
3103
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
3131
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
3137
}
2472
3138
}
2473
3139
2474
3140
free(interfaces_to_take_down);
2475
3141
free(interfaces_hooks);
2476
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
3145
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
2477
3197
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2479
struct dirent **direntries = NULL;
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2511
3200
}
2512
3201
2513
3202
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0