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- Committer: Teddy Hogeborn
- Date: 2018-04-02 10:24:15 UTC
- Revision ID: teddy@recompile.se-20180402102415-xrsu0wxhnmlaq29a
Minor code cleanup
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
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
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
401
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
405
511
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
409
513
}
410
514
}
411
515
}
467
571
return plaintext_length;
468
572
}
469
573
470
static const char * safer_gnutls_strerror(int value){
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
581
__attribute__((warn_unused_result))
582
static const char *safer_gnutls_strerror(int value){
471
583
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
584
return safe_string(ret);
475
585
}
476
586
477
587
/* GnuTLS log function callback */
588
__attribute__((nonnull))
478
589
static void debuggnutls(__attribute__((unused)) int level,
479
590
const char* string){
480
591
fprintf_plus(stderr, "GnuTLS: %s", string);
481
592
}
482
593
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
595
static int init_gnutls_global(const char *pubkeyfilename,
484
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
485
598
mandos_context *mc){
486
599
int ret;
600
unsigned int uret;
487
601
488
602
if(debug){
489
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
604
}
491
605
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
606
if(debug){
500
607
/* "Use a log level over 10 to enable all debugging options."
501
608
* - GnuTLS manual
509
616
if(ret != GNUTLS_E_SUCCESS){
510
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
618
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
619
return -1;
514
620
}
515
621
540
646
safer_gnutls_strerror(ret));
541
647
goto globalfail;
542
648
}
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
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
550
826
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
827
552
828
return 0;
554
830
globalfail:
555
831
556
832
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
833
gnutls_dh_params_deinit(mc->dh_params);
559
834
return -1;
560
835
}
561
836
837
__attribute__((nonnull, warn_unused_result))
562
838
static int init_gnutls_session(gnutls_session_t *session,
563
839
mandos_context *mc){
564
840
int ret;
611
887
/* ignore client certificate if any. */
612
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
889
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
890
return 0;
617
891
}
618
892
620
894
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
895
__attribute__((unused)) const char *txt){}
622
896
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
623
1115
/* Called when a Mandos server is found */
1116
__attribute__((nonnull, warn_unused_result))
624
1117
static int start_mandos_communication(const char *ip, in_port_t port,
625
1118
AvahiIfIndex if_index,
626
1119
int af, mandos_context *mc){
627
1120
int ret, tcp_sd = -1;
628
1121
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1122
struct sockaddr_storage to;
633
1123
char *buffer = NULL;
634
1124
char *decrypted_buffer = NULL;
635
1125
size_t buffer_length = 0;
638
1128
int retval = -1;
639
1129
gnutls_session_t session;
640
1130
int pf; /* Protocol family */
1131
bool route_added = false;
641
1132
642
1133
errno = 0;
643
1134
665
1156
bool match = false;
666
1157
{
667
1158
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
670
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
671
1163
match = true;
672
1164
break;
701
1193
PRIuMAX "\n", ip, (uintmax_t)port);
702
1194
}
703
1195
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
705
1197
if(tcp_sd < 0){
706
1198
int e = errno;
707
1199
perror_plus("socket");
714
1206
goto mandos_end;
715
1207
}
716
1208
717
memset(&to, 0, sizeof(to));
718
1209
if(af == AF_INET6){
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
721
1213
} else { /* IPv4 */
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
724
1217
}
725
1218
if(ret < 0 ){
726
1219
int e = errno;
735
1228
goto mandos_end;
736
1229
}
737
1230
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*/
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
742
1234
if(if_index == AVAHI_IF_UNSPEC){
743
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
744
1236
" incomplete without a network interface\n");
746
1238
goto mandos_end;
747
1239
}
748
1240
/* Set the network interface number as scope */
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
750
1242
}
751
1243
} else {
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
755
1245
}
756
1246
757
1247
if(quit_now){
774
1264
}
775
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
1266
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;
1267
if(af == AF_INET6){
1268
ret = getnameinfo((struct sockaddr *)&to,
1269
sizeof(struct sockaddr_in6),
1270
addrstr, sizeof(addrstr), NULL, 0,
1271
NI_NUMERICHOST);
1272
} else {
1273
ret = getnameinfo((struct sockaddr *)&to,
1274
sizeof(struct sockaddr_in),
1275
addrstr, sizeof(addrstr), NULL, 0,
1276
NI_NUMERICHOST);
1277
}
1278
if(ret == EAI_SYSTEM){
1279
perror_plus("getnameinfo");
1280
} else if(ret != 0) {
1281
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1282
} else if(strcmp(addrstr, ip) != 0){
1283
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1284
}
1285
}
1286
1287
if(quit_now){
1288
errno = EINTR;
1289
goto mandos_end;
1290
}
1291
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
816
1347
}
817
1348
818
1349
const char *out = mandos_protocol_version;
972
1503
&decrypted_buffer, mc);
973
1504
if(decrypted_buffer_size >= 0){
974
1505
1506
clearerr(stdout);
975
1507
written = 0;
976
1508
while(written < (size_t) decrypted_buffer_size){
977
1509
if(quit_now){
993
1525
}
994
1526
written += (size_t)ret;
995
1527
}
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
996
1538
retval = 0;
997
1539
}
998
1540
}
1001
1543
1002
1544
mandos_end:
1003
1545
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
1004
1552
int e = errno;
1005
1553
free(decrypted_buffer);
1006
1554
free(buffer);
1007
1555
if(tcp_sd >= 0){
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1556
ret = close(tcp_sd);
1009
1557
}
1010
1558
if(ret == -1){
1011
1559
if(e == 0){
1036
1584
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1585
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1586
flags,
1039
void* mc){
1587
void *mc){
1040
1588
if(r == NULL){
1041
1589
return;
1042
1590
}
1045
1593
timed out */
1046
1594
1047
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1048
1597
return;
1049
1598
}
1050
1599
1095
1644
const char *domain,
1096
1645
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1646
flags,
1098
void* mc){
1647
void *mc){
1099
1648
if(b == NULL){
1100
1649
return;
1101
1650
}
1161
1710
errno = old_errno;
1162
1711
}
1163
1712
1713
__attribute__((nonnull, warn_unused_result))
1164
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1715
int ret;
1166
error_t ret_errno;
1716
int old_errno;
1167
1717
1168
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1719
if(s < 0){
1170
ret_errno = errno;
1720
old_errno = errno;
1171
1721
perror_plus("socket");
1172
errno = ret_errno;
1722
errno = old_errno;
1173
1723
return false;
1174
1724
}
1175
strcpy(ifr->ifr_name, ifname);
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1176
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1728
if(ret == -1){
1178
1729
if(debug){
1179
ret_errno = errno;
1730
old_errno = errno;
1180
1731
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1182
1738
}
1183
1739
return false;
1184
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1185
1746
return true;
1186
1747
}
1187
1748
1749
__attribute__((nonnull, warn_unused_result))
1188
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1751
1190
1752
/* Reject the loopback device */
1232
1794
* corresponds to an acceptable network device.
1233
1795
* (This function is passed to scandir(3) as a filter function.)
1234
1796
*/
1797
__attribute__((nonnull, warn_unused_result))
1235
1798
int good_interface(const struct dirent *if_entry){
1236
1799
if(if_entry->d_name[0] == '.'){
1237
1800
return 0;
1255
1818
/*
1256
1819
* This function determines if a network interface is up.
1257
1820
*/
1821
__attribute__((nonnull, warn_unused_result))
1258
1822
bool interface_is_up(const char *interface){
1259
1823
struct ifreq ifr;
1260
1824
if(not get_flags(interface, &ifr)){
1271
1835
/*
1272
1836
* This function determines if a network interface is running
1273
1837
*/
1838
__attribute__((nonnull, warn_unused_result))
1274
1839
bool interface_is_running(const char *interface){
1275
1840
struct ifreq ifr;
1276
1841
if(not get_flags(interface, &ifr)){
1284
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
1850
}
1286
1851
1852
__attribute__((nonnull, pure, warn_unused_result))
1287
1853
int notdotentries(const struct dirent *direntry){
1288
1854
/* Skip "." and ".." */
1289
1855
if(direntry->d_name[0] == '.'
1296
1862
}
1297
1863
1298
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1299
1866
int runnable_hook(const struct dirent *direntry){
1300
1867
int ret;
1301
1868
size_t sret;
1309
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
1877
"abcdefghijklmnopqrstuvwxyz"
1311
1878
"0123456789"
1312
"_-");
1879
"_.-");
1313
1880
if((direntry->d_name)[sret] != '\0'){
1314
1881
/* Contains non-allowed characters */
1315
1882
if(debug){
1319
1886
return 0;
1320
1887
}
1321
1888
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);
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1330
1890
if(ret == -1){
1331
1891
if(debug){
1332
1892
perror_plus("Could not stat hook");
1356
1916
return 1;
1357
1917
}
1358
1918
1919
__attribute__((nonnull, warn_unused_result))
1359
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
1921
mandos_context *mc){
1361
1922
int ret;
1365
1926
1366
1927
while(true){
1367
1928
if(mc->current_server == NULL){
1368
if (debug){
1929
if(debug){
1369
1930
fprintf_plus(stderr, "Wait until first server is found."
1370
1931
" No timeout!\n");
1371
1932
}
1372
1933
ret = avahi_simple_poll_iterate(s, -1);
1373
1934
} else {
1374
if (debug){
1935
if(debug){
1375
1936
fprintf_plus(stderr, "Check current_server if we should run"
1376
1937
" it, or wait\n");
1377
1938
}
1394
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1395
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1957
1397
if (debug){
1958
if(debug){
1398
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
1960
block_time);
1400
1961
}
1422
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1984
}
1424
1985
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1986
if(ret > 0 or errno != EINTR){
1426
1987
return (ret != 1) ? ret : 0;
1427
1988
}
1428
1989
}
1429
1990
}
1430
1991
}
1431
1992
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,
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1485
1995
const float delay){
1486
struct dirent **direntries;
1996
struct dirent **direntries = NULL;
1997
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
2000
if(hookdir_fd == -1){
2001
if(errno == ENOENT){
2002
if(debug){
2003
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2004
" found\n", hookdir);
2005
}
2006
} else {
2007
perror_plus("open");
2008
}
2009
return;
2010
}
2011
}
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
runnable_hook, alphasort);
2019
if(numhooks == -1){
2020
perror_plus("scandir");
2021
close(devnull);
2022
return;
2023
}
1487
2024
struct dirent *direntry;
1488
2025
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");
2026
for(int i = 0; i < numhooks; i++){
2027
direntry = direntries[i];
2028
if(debug){
2029
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2030
direntry->d_name);
1499
2031
}
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){
2032
pid_t hook_pid = fork();
2033
if(hook_pid == 0){
2034
/* Child */
2035
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2037
if(errno != 0){
2038
perror_plus("Failed to raise privileges");
2039
_exit(EX_NOPERM);
2040
}
2041
/* Set group */
2042
errno = 0;
2043
ret = setgid(0);
2044
if(ret == -1){
2045
perror_plus("setgid");
2046
_exit(EX_NOPERM);
2047
}
2048
/* Reset supplementary groups */
2049
errno = 0;
2050
ret = setgroups(0, NULL);
2051
if(ret == -1){
2052
perror_plus("setgroups");
2053
_exit(EX_NOPERM);
2054
}
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
if(ret == -1){
2057
perror_plus("setenv");
2058
_exit(EX_OSERR);
2059
}
2060
ret = setenv("DEVICE", interface, 1);
2061
if(ret == -1){
2062
perror_plus("setenv");
2063
_exit(EX_OSERR);
2064
}
2065
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2066
if(ret == -1){
2067
perror_plus("setenv");
2068
_exit(EX_OSERR);
2069
}
2070
ret = setenv("MODE", mode, 1);
2071
if(ret == -1){
2072
perror_plus("setenv");
2073
_exit(EX_OSERR);
2074
}
2075
char *delaystring;
2076
ret = asprintf(&delaystring, "%f", (double)delay);
2077
if(ret == -1){
1507
2078
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
}
2079
_exit(EX_OSERR);
2080
}
2081
ret = setenv("DELAY", delaystring, 1);
2082
if(ret == -1){
1566
2083
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
}
2084
perror_plus("setenv");
2085
_exit(EX_OSERR);
2086
}
2087
free(delaystring);
2088
if(connect_to != NULL){
2089
ret = setenv("CONNECT", connect_to, 1);
2090
if(ret == -1){
2091
perror_plus("setenv");
2092
_exit(EX_OSERR);
2093
}
2094
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
2098
if(hook_fd == -1){
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2101
}
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
environ) == -1){
2123
perror_plus("fexecve");
2124
_exit(EXIT_FAILURE);
2125
}
2126
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
2132
int status;
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
perror_plus("waitpid");
2135
free(direntry);
2136
continue;
2137
}
2138
if(WIFEXITED(status)){
2139
if(WEXITSTATUS(status) != 0){
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
" with status %d\n", direntry->d_name,
2142
WEXITSTATUS(status));
2143
free(direntry);
2144
continue;
2145
}
2146
} else if(WIFSIGNALED(status)){
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
" signal %d\n", direntry->d_name,
2149
WTERMSIG(status));
2150
free(direntry);
2151
continue;
1578
2152
} 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;
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
" crashed\n", direntry->d_name);
2155
free(direntry);
2156
continue;
2157
}
2158
}
2159
if(debug){
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2161
direntry->d_name);
2162
}
2163
free(direntry);
2164
}
2165
free(direntries);
2166
if(close(hookdir_fd) == -1){
2167
perror_plus("close");
2168
} else {
2169
hookdir_fd = -1;
2170
}
2171
close(devnull);
1615
2172
}
1616
2173
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;
2174
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
2178
int ret;
1623
2179
struct ifreq network;
1624
2180
unsigned int if_index = if_nametoindex(interface);
1625
2181
if(if_index == 0){
1634
2190
}
1635
2191
1636
2192
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
1638
2196
ret_errno = errno;
1639
2197
fprintf_plus(stderr, "Failed to get flags for interface "
1640
2198
"\"%s\"\n", interface);
2199
errno = old_errno;
1641
2200
return ret_errno;
1642
2201
}
1643
network.ifr_flags |= IFF_UP;
2202
network.ifr_flags |= IFF_UP; /* set flag */
1644
2203
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2205
if(sd == -1){
1647
2206
ret_errno = errno;
1648
2207
perror_plus("socket");
1649
2208
errno = old_errno;
1650
2209
return ret_errno;
1651
2210
}
1652
2211
1653
2212
if(quit_now){
1654
close(sd);
2213
ret = close(sd);
2214
if(ret == -1){
2215
perror_plus("close");
2216
}
1655
2217
errno = old_errno;
1656
2218
return EINTR;
1657
2219
}
1661
2223
interface);
1662
2224
}
1663
2225
1664
/* Raise priviliges */
1665
raise_privileges();
2226
/* Raise privileges */
2227
ret_errno = raise_privileges();
2228
if(ret_errno != 0){
2229
errno = ret_errno;
2230
perror_plus("Failed to raise privileges");
2231
}
1666
2232
1667
2233
#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");
2234
int ret_linux;
2235
bool restore_loglevel = false;
2236
if(ret_errno == 0){
2237
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2238
messages about the network interface to mess up the prompt */
2239
ret_linux = klogctl(8, NULL, 5);
2240
if(ret_linux == -1){
2241
perror_plus("klogctl");
2242
} else {
2243
restore_loglevel = true;
2244
}
1675
2245
}
1676
2246
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
1679
2249
#ifdef __linux__
1680
2250
if(restore_loglevel){
1681
2251
ret_linux = klogctl(7, NULL, 0);
1685
2255
}
1686
2256
#endif /* __linux__ */
1687
2257
1688
/* Lower privileges */
1689
lower_privileges();
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
1690
2267
1691
2268
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
ret = close(sd);
1693
2270
if(ret == -1){
1694
2271
perror_plus("close");
1695
2272
}
1696
2273
1697
2274
if(ret_setflags == -1){
1698
errno = ret_errno;
2275
errno = ioctl_errno;
1699
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
2277
errno = old_errno;
1701
return ret_errno;
2278
return ioctl_errno;
1702
2279
}
1703
2280
} else if(debug){
1704
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1707
2284
1708
2285
/* Sleep checking until interface is running.
1709
2286
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
2287
for(int i = 0; i < delay * 4; i++){
1711
2288
if(interface_is_running(interface)){
1712
2289
break;
1713
2290
}
1722
2299
return 0;
1723
2300
}
1724
2301
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;
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
1730
2305
struct ifreq network;
1731
2306
unsigned int if_index = if_nametoindex(interface);
1732
2307
if(if_index == 0){
1735
2310
return ENXIO;
1736
2311
}
1737
2312
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1738
2315
if(not get_flags(interface, &network) and debug){
1739
2316
ret_errno = errno;
1740
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1741
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
1742
2320
return ret_errno;
1743
2321
}
1744
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
2323
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1748
2326
ret_errno = errno;
1749
2327
perror_plus("socket");
1750
2328
errno = old_errno;
1756
2334
interface);
1757
2335
}
1758
2336
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();
2337
/* Raise privileges */
2338
ret_errno = raise_privileges();
2339
if(ret_errno != 0){
2340
errno = ret_errno;
2341
perror_plus("Failed to raise privileges");
2342
}
2343
2344
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2345
ioctl_errno = errno;
2346
2347
/* If raise_privileges() succeeded above */
2348
if(ret_errno == 0){
2349
/* Lower privileges */
2350
ret_errno = lower_privileges();
2351
if(ret_errno != 0){
2352
errno = ret_errno;
2353
perror_plus("Failed to lower privileges");
2354
}
2355
}
1767
2356
1768
2357
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2358
int ret = close(sd);
1770
2359
if(ret == -1){
1771
2360
perror_plus("close");
1772
2361
}
1773
2362
1774
2363
if(ret_setflags == -1){
1775
errno = ret_errno;
2364
errno = ioctl_errno;
1776
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
2366
errno = old_errno;
1778
return ret_errno;
2367
return ioctl_errno;
1779
2368
}
1780
2369
} else if(debug){
1781
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
2376
}
1788
2377
1789
2378
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 };
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
1794
2384
AvahiSServiceBrowser *sb = NULL;
1795
2385
error_t ret_errno;
1796
2386
int ret;
1799
2389
int exitcode = EXIT_SUCCESS;
1800
2390
char *interfaces_to_take_down = NULL;
1801
2391
size_t interfaces_to_take_down_size = 0;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
1804
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
2396
const char *seckey = PATHDIR "/" SECKEY;
1806
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
1807
2399
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
2400
1810
2401
bool gnutls_initialized = false;
1811
2402
bool gpgme_initialized = false;
1863
2454
.doc = "Bit length of the prime number used in the"
1864
2455
" Diffie-Hellman key exchange",
1865
2456
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
1866
2462
{ .name = "priority", .key = 130,
1867
2463
.arg = "STRING",
1868
2464
.doc = "GnuTLS priority string for the TLS handshake",
1923
2519
}
1924
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1925
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
1926
2525
case 130: /* --priority */
1927
2526
mc.priority = arg;
1928
2527
break;
1968
2567
.args_doc = "",
1969
2568
.doc = "Mandos client -- Get and decrypt"
1970
2569
" passwords from a Mandos server" };
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
1974
2573
case 0:
1975
2574
break;
1976
2575
case ENOMEM:
1977
2576
default:
1978
errno = ret;
2577
errno = ret_errno;
1979
2578
perror_plus("argp_parse");
1980
2579
exitcode = EX_OSERR;
1981
2580
goto end;
1984
2583
goto end;
1985
2584
}
1986
2585
}
1987
2586
1988
2587
{
1989
2588
/* Work around Debian bug #633582:
1990
<http://bugs.debian.org/633582> */
2589
<https://bugs.debian.org/633582> */
1991
2590
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to raise privileges");
2596
} else {
1994
2597
struct stat st;
1995
2598
1996
2599
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2010
2613
}
2011
2614
}
2012
2615
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2616
close(seckey_fd);
2014
2617
}
2015
2618
}
2016
2619
2017
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2019
2622
if(pubkey_fd == -1){
2031
2634
}
2032
2635
}
2033
2636
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
2038
2663
/* Lower privileges */
2039
lower_privileges();
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2667
perror_plus("Failed to lower privileges");
2668
}
2040
2669
}
2041
2670
}
2042
2671
2066
2695
goto end;
2067
2696
}
2068
2697
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
}
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2699
}
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
2077
2702
}
2078
2703
2079
2704
if(not debug){
2157
2782
2158
2783
/* If no interfaces were specified, make a list */
2159
2784
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2785
struct dirent **direntries = NULL;
2161
2786
/* Look for any good interfaces */
2162
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2163
2788
alphasort);
2167
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
2793
direntries[i]->d_name);
2169
2794
if(ret_errno != 0){
2795
errno = ret_errno;
2170
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2171
2798
continue;
2172
2799
}
2173
2800
if(debug){
2174
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
2802
direntries[i]->d_name);
2176
2803
}
2804
free(direntries[i]);
2177
2805
}
2178
2806
free(direntries);
2179
2807
} else {
2180
free(direntries);
2808
if(ret == 0){
2809
free(direntries);
2810
}
2181
2811
fprintf_plus(stderr, "Could not find a network interface\n");
2182
2812
exitcode = EXIT_FAILURE;
2183
2813
goto end;
2206
2836
break;
2207
2837
}
2208
2838
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2839
errno = bring_up_interface(interface, delay);
2210
2840
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2841
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2214
2844
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2845
errno = argz_add(&interfaces_to_take_down,
2846
&interfaces_to_take_down_size,
2847
interface);
2848
if(errno != 0){
2849
perror_plus("argz_add");
2850
}
2218
2851
}
2219
2852
}
2220
2853
}
2236
2869
goto end;
2237
2870
}
2238
2871
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2240
2873
if(ret == -1){
2241
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2242
2875
exitcode = EX_UNAVAILABLE;
2249
2882
goto end;
2250
2883
}
2251
2884
2252
if(mkdtemp(tempdir) == NULL){
2885
/* Try /run/tmp before /tmp */
2886
tempdir = mkdtemp(run_tempdir);
2887
if(tempdir == NULL and errno == ENOENT){
2888
if(debug){
2889
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2890
run_tempdir, old_tempdir);
2891
}
2892
tempdir = mkdtemp(old_tempdir);
2893
}
2894
if(tempdir == NULL){
2253
2895
perror_plus("mkdtemp");
2254
2896
goto end;
2255
2897
}
2256
tempdir_created = true;
2257
2898
2258
2899
if(quit_now){
2259
2900
goto end;
2331
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
2973
(int)retry_interval);
2333
2974
}
2334
sleep((int)retry_interval);
2975
sleep((unsigned int)retry_interval);
2335
2976
}
2336
2977
2337
if (not quit_now){
2978
if(not quit_now){
2338
2979
exitcode = EXIT_SUCCESS;
2339
2980
}
2340
2981
2356
2997
2357
2998
/* Allocate a new server */
2358
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
3000
&config, NULL, NULL, &ret);
2360
3001
2361
3002
/* Free the Avahi configuration data */
2362
3003
avahi_server_config_free(&config);
2365
3006
/* Check if creating the Avahi server object succeeded */
2366
3007
if(mc.server == NULL){
2367
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
3009
avahi_strerror(ret));
2369
3010
exitcode = EX_UNAVAILABLE;
2370
3011
goto end;
2371
3012
}
2395
3036
if(debug){
2396
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
2397
3038
}
2398
3039
2399
3040
ret = avahi_loop_with_timeout(simple_poll,
2400
3041
(int)(retry_interval * 1000), &mc);
2401
3042
if(debug){
2406
3047
end:
2407
3048
2408
3049
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
2410
3057
}
2411
3058
2412
3059
/* Cleanup things */
2423
3070
2424
3071
if(gnutls_initialized){
2425
3072
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
2427
3073
gnutls_dh_params_deinit(mc.dh_params);
2428
3074
}
2429
3075
2437
3083
mc.current_server->prev->next = NULL;
2438
3084
while(mc.current_server != NULL){
2439
3085
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
2440
3094
free(mc.current_server);
2441
3095
mc.current_server = next;
2442
3096
}
2443
3097
}
2444
3098
2445
/* Re-raise priviliges */
3099
/* Re-raise privileges */
2446
3100
{
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();
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
3104
perror_plus("Failed to raise privileges");
3105
} else {
3106
3107
/* Run network hooks */
3108
run_network_hooks("stop", interfaces_hooks != NULL ?
3109
interfaces_hooks : "", delay);
3110
3111
/* Take down the network interfaces which were brought up */
3112
{
3113
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
3120
perror_plus("Failed to take down interface");
3121
}
3122
}
3123
if(debug and (interfaces_to_take_down == NULL)){
3124
fprintf_plus(stderr, "No interfaces needed to be taken"
3125
" down\n");
3126
}
3127
}
3128
}
3129
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
3133
perror_plus("Failed to lower privileges permanently");
3134
}
2472
3135
}
2473
3136
2474
3137
free(interfaces_to_take_down);
2475
3138
free(interfaces_hooks);
2476
3139
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
3192
}
3193
2477
3194
/* 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
}
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
2511
3197
}
2512
3198
2513
3199
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0