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- Committer: Teddy Hogeborn
- Date: 2014-01-20 21:50:11 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 307.
- Revision ID: teddy@recompile.se-20140120215011-ka70v54d3rb2pyug
Bug fix from libdir change: make plugins get setuid bit again.
* debian/mandos-client.lintian-overrides: Libdir changes.
* debian/rules (override_dh_fixperms): - '' -
* debian/mandos-client.lintian-overrides: Libdir changes.
* debian/rules (override_dh_fixperms): - '' -
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 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
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
99
91
argz_delete(), argz_append(),
100
92
argz_stringify(), argz_add(),
101
93
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
94
105
95
#ifdef __linux__
106
96
#include <sys/klog.h> /* klogctl() */
123
113
gnutls_*
124
114
init_gnutls_session(),
125
115
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
116
#include <gnutls/openpgp.h>
128
117
/* gnutls_certificate_set_openpgp_key_file(),
129
118
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
135
119
136
120
/* GPGME */
137
121
#include <gpgme.h> /* All GPGME types, constants and
145
129
#define PATHDIR "/conf/conf.d/mandos"
146
130
#define SECKEY "seckey.txt"
147
131
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
133
152
134
bool debug = false;
156
138
static const char sys_class_net[] = "/sys/class/net";
157
139
char *connect_to = NULL;
158
140
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
141
uid_t uid = 65534;
161
142
gid_t gid = 65534;
162
143
199
180
perror(print_text);
200
181
}
201
182
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
203
184
int fprintf_plus(FILE *stream, const char *format, ...){
204
185
va_list ap;
205
186
va_start (ap, format);
214
195
* bytes. "buffer_capacity" is how much is currently allocated,
215
196
* "buffer_length" is how much is already used.
216
197
*/
217
__attribute__((nonnull, warn_unused_result))
218
198
size_t incbuffer(char **buffer, size_t buffer_length,
219
199
size_t buffer_capacity){
220
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
227
203
return 0;
228
204
}
229
*buffer = new_buf;
230
205
buffer_capacity += BUFFER_SIZE;
231
206
}
232
207
return buffer_capacity;
233
208
}
234
209
235
210
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
212
int af, server **current_server){
239
213
int ret;
248
222
.af = af };
249
223
if(new_server->ip == NULL){
250
224
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
225
return false;
267
226
}
268
227
/* Special case of first server */
270
229
new_server->next = new_server;
271
230
new_server->prev = new_server;
272
231
*current_server = new_server;
232
/* Place the new server last in the list */
273
233
} else {
274
/* Place the new server last in the list */
275
234
new_server->next = *current_server;
276
235
new_server->prev = (*current_server)->prev;
277
236
new_server->prev->next = new_server;
278
237
(*current_server)->prev = new_server;
279
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
280
244
return true;
281
245
}
282
246
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
335
247
/*
336
248
* Initialize GPGME.
337
249
*/
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
343
252
gpgme_error_t rc;
344
253
gpgme_engine_info_t engine_info;
345
254
346
255
/*
347
256
* Helper function to insert pub and seckey to the engine keyring.
348
257
*/
349
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
350
259
int ret;
351
260
int fd;
352
261
gpgme_data_t pgp_data;
357
266
return false;
358
267
}
359
268
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
409
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
270
if(rc != GPG_ERR_NO_ERROR){
411
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
419
279
gpgme_strsource(rc), gpgme_strerror(rc));
420
280
return false;
421
281
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
497
282
498
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
284
if(ret == -1){
500
285
perror_plus("close");
501
286
}
540
325
/* Create new GPGME "context" */
541
326
rc = gpgme_new(&(mc->ctx));
542
327
if(rc != GPG_ERR_NO_ERROR){
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
545
331
return false;
546
332
}
547
333
556
342
* Decrypt OpenPGP data.
557
343
* Returns -1 on error
558
344
*/
559
__attribute__((nonnull, warn_unused_result))
560
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
561
346
size_t crypto_size,
562
347
char **plaintext,
583
368
/* Create new empty GPGME data buffer for the plaintext */
584
369
rc = gpgme_data_new(&dh_plain);
585
370
if(rc != GPG_ERR_NO_ERROR){
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
587
373
gpgme_strsource(rc), gpgme_strerror(rc));
588
374
gpgme_data_release(dh_crypto);
589
375
return -1;
602
388
if(result == NULL){
603
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
604
390
} else {
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
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);
611
395
if(result->file_name != NULL){
612
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
613
397
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
617
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
620
405
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
622
409
}
623
410
}
624
411
}
680
467
return plaintext_length;
681
468
}
682
469
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
690
__attribute__((warn_unused_result))
691
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
692
471
const char *ret = gnutls_strerror(value);
693
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
694
475
}
695
476
696
477
/* GnuTLS log function callback */
697
__attribute__((nonnull))
698
478
static void debuggnutls(__attribute__((unused)) int level,
699
479
const char* string){
700
480
fprintf_plus(stderr, "GnuTLS: %s", string);
701
481
}
702
482
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
704
483
static int init_gnutls_global(const char *pubkeyfilename,
705
484
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
485
mandos_context *mc){
708
486
int ret;
709
487
711
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
712
490
}
713
491
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
714
499
if(debug){
715
500
/* "Use a log level over 10 to enable all debugging options."
716
501
* - GnuTLS manual
724
509
if(ret != GNUTLS_E_SUCCESS){
725
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
727
513
return -1;
728
514
}
729
515
730
516
if(debug){
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
733
519
pubkeyfilename,
734
520
seckeyfilename);
735
521
}
736
522
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
750
523
ret = gnutls_certificate_set_openpgp_key_file
751
524
(mc->cred, pubkeyfilename, seckeyfilename,
752
525
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
526
if(ret != GNUTLS_E_SUCCESS){
757
527
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
531
safer_gnutls_strerror(ret));
770
540
safer_gnutls_strerror(ret));
771
541
goto globalfail;
772
542
}
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
953
}
954
}
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
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
955
551
956
552
return 0;
957
553
958
554
globalfail:
959
555
960
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
961
558
gnutls_dh_params_deinit(mc->dh_params);
962
559
return -1;
963
560
}
964
561
965
__attribute__((nonnull, warn_unused_result))
966
562
static int init_gnutls_session(gnutls_session_t *session,
967
563
mandos_context *mc){
968
564
int ret;
969
565
/* GnuTLS session creation */
970
566
do {
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
567
ret = gnutls_init(session, GNUTLS_SERVER);
979
568
if(quit_now){
980
569
return -1;
981
570
}
1022
611
/* ignore client certificate if any. */
1023
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1024
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
1025
616
return 0;
1026
617
}
1027
618
1029
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
621
__attribute__((unused)) const char *txt){}
1031
622
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
1205
623
/* Called when a Mandos server is found */
1206
__attribute__((nonnull, warn_unused_result))
1207
624
static int start_mandos_communication(const char *ip, in_port_t port,
1208
625
AvahiIfIndex if_index,
1209
626
int af, mandos_context *mc){
1210
627
int ret, tcp_sd = -1;
1211
628
ssize_t sret;
1212
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1213
633
char *buffer = NULL;
1214
634
char *decrypted_buffer = NULL;
1215
635
size_t buffer_length = 0;
1218
638
int retval = -1;
1219
639
gnutls_session_t session;
1220
640
int pf; /* Protocol family */
1221
bool route_added = false;
1222
641
1223
642
errno = 0;
1224
643
1246
665
bool match = false;
1247
666
{
1248
667
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1252
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
671
match = true;
1254
672
break;
1283
701
PRIuMAX "\n", ip, (uintmax_t)port);
1284
702
}
1285
703
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
705
if(tcp_sd < 0){
1288
706
int e = errno;
1289
707
perror_plus("socket");
1296
714
goto mandos_end;
1297
715
}
1298
716
717
memset(&to, 0, sizeof(to));
1299
718
if(af == AF_INET6){
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1303
721
} else { /* IPv4 */
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1307
724
}
1308
725
if(ret < 0 ){
1309
726
int e = errno;
1318
735
goto mandos_end;
1319
736
}
1320
737
if(af == AF_INET6){
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
1324
748
if(if_index == AVAHI_IF_UNSPEC){
1325
749
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
750
" incomplete without a network interface\n");
1328
752
goto mandos_end;
1329
753
}
1330
754
/* Set the network interface number as scope */
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
755
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
756
}
1333
757
} else {
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
758
to.in.sin_port = htons(port);
1335
759
}
1336
760
1337
761
if(quit_now){
1354
778
}
1355
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1356
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1357
if(af == AF_INET6){
1358
ret = getnameinfo((struct sockaddr *)&to,
1359
sizeof(struct sockaddr_in6),
1360
addrstr, sizeof(addrstr), NULL, 0,
1361
NI_NUMERICHOST);
1362
} else {
1363
ret = getnameinfo((struct sockaddr *)&to,
1364
sizeof(struct sockaddr_in),
1365
addrstr, sizeof(addrstr), NULL, 0,
1366
NI_NUMERICHOST);
1367
}
1368
if(ret == EAI_SYSTEM){
1369
perror_plus("getnameinfo");
1370
} else if(ret != 0) {
1371
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1372
} else if(strcmp(addrstr, ip) != 0){
1373
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1374
}
1375
}
1376
1377
if(quit_now){
1378
errno = EINTR;
1379
goto mandos_end;
1380
}
1381
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
791
} else {
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
794
}
795
}
796
}
797
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
1437
820
}
1438
821
1439
822
const char *out = mandos_protocol_version;
1593
976
&decrypted_buffer, mc);
1594
977
if(decrypted_buffer_size >= 0){
1595
978
1596
clearerr(stdout);
1597
979
written = 0;
1598
980
while(written < (size_t) decrypted_buffer_size){
1599
981
if(quit_now){
1615
997
}
1616
998
written += (size_t)ret;
1617
999
}
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
1628
1000
retval = 0;
1629
1001
}
1630
1002
}
1633
1005
1634
1006
mandos_end:
1635
1007
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
1642
1008
int e = errno;
1643
1009
free(decrypted_buffer);
1644
1010
free(buffer);
1645
1011
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
1013
}
1648
1014
if(ret == -1){
1649
1015
if(e == 0){
1674
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1675
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1676
1042
flags,
1677
void *mc){
1043
void* mc){
1678
1044
if(r == NULL){
1679
1045
return;
1680
1046
}
1683
1049
timed out */
1684
1050
1685
1051
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1687
1052
return;
1688
1053
}
1689
1054
1734
1099
const char *domain,
1735
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1736
1101
flags,
1737
void *mc){
1102
void* mc){
1738
1103
if(b == NULL){
1739
1104
return;
1740
1105
}
1800
1165
errno = old_errno;
1801
1166
}
1802
1167
1803
__attribute__((nonnull, warn_unused_result))
1804
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
1169
int ret;
1806
int old_errno;
1170
error_t ret_errno;
1807
1171
1808
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
1173
if(s < 0){
1810
old_errno = errno;
1174
ret_errno = errno;
1811
1175
perror_plus("socket");
1812
errno = old_errno;
1176
errno = ret_errno;
1813
1177
return false;
1814
1178
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1179
strcpy(ifr->ifr_name, ifname);
1817
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
1181
if(ret == -1){
1819
1182
if(debug){
1820
old_errno = errno;
1183
ret_errno = errno;
1821
1184
perror_plus("ioctl SIOCGIFFLAGS");
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1185
errno = ret_errno;
1828
1186
}
1829
1187
return false;
1830
1188
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
1189
return true;
1837
1190
}
1838
1191
1839
__attribute__((nonnull, warn_unused_result))
1840
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1841
1193
1842
1194
/* Reject the loopback device */
1884
1236
* corresponds to an acceptable network device.
1885
1237
* (This function is passed to scandir(3) as a filter function.)
1886
1238
*/
1887
__attribute__((nonnull, warn_unused_result))
1888
1239
int good_interface(const struct dirent *if_entry){
1889
1240
if(if_entry->d_name[0] == '.'){
1890
1241
return 0;
1908
1259
/*
1909
1260
* This function determines if a network interface is up.
1910
1261
*/
1911
__attribute__((nonnull, warn_unused_result))
1912
1262
bool interface_is_up(const char *interface){
1913
1263
struct ifreq ifr;
1914
1264
if(not get_flags(interface, &ifr)){
1925
1275
/*
1926
1276
* This function determines if a network interface is running
1927
1277
*/
1928
__attribute__((nonnull, warn_unused_result))
1929
1278
bool interface_is_running(const char *interface){
1930
1279
struct ifreq ifr;
1931
1280
if(not get_flags(interface, &ifr)){
1939
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1940
1289
}
1941
1290
1942
__attribute__((nonnull, pure, warn_unused_result))
1943
1291
int notdotentries(const struct dirent *direntry){
1944
1292
/* Skip "." and ".." */
1945
1293
if(direntry->d_name[0] == '.'
1952
1300
}
1953
1301
1954
1302
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1956
1303
int runnable_hook(const struct dirent *direntry){
1957
1304
int ret;
1958
1305
size_t sret;
1966
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1967
1314
"abcdefghijklmnopqrstuvwxyz"
1968
1315
"0123456789"
1969
"_.-");
1316
"_-");
1970
1317
if((direntry->d_name)[sret] != '\0'){
1971
1318
/* Contains non-allowed characters */
1972
1319
if(debug){
1976
1323
return 0;
1977
1324
}
1978
1325
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1980
1334
if(ret == -1){
1981
1335
if(debug){
1982
1336
perror_plus("Could not stat hook");
2006
1360
return 1;
2007
1361
}
2008
1362
2009
__attribute__((nonnull, warn_unused_result))
2010
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
1364
mandos_context *mc){
2012
1365
int ret;
2016
1369
2017
1370
while(true){
2018
1371
if(mc->current_server == NULL){
2019
if(debug){
1372
if (debug){
2020
1373
fprintf_plus(stderr, "Wait until first server is found."
2021
1374
" No timeout!\n");
2022
1375
}
2023
1376
ret = avahi_simple_poll_iterate(s, -1);
2024
1377
} else {
2025
if(debug){
1378
if (debug){
2026
1379
fprintf_plus(stderr, "Check current_server if we should run"
2027
1380
" it, or wait\n");
2028
1381
}
2045
1398
- ((intmax_t)waited_time.tv_sec * 1000))
2046
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
2047
1400
2048
if(debug){
1401
if (debug){
2049
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2050
1403
block_time);
2051
1404
}
2073
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
2074
1427
}
2075
1428
if(ret != 0){
2076
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
2077
1430
return (ret != 1) ? ret : 0;
2078
1431
}
2079
1432
}
2080
1433
}
2081
1434
}
2082
1435
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
2085
1489
const float delay){
2086
struct dirent **direntries = NULL;
2087
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| O_CLOEXEC);
2090
if(hookdir_fd == -1){
2091
if(errno == ENOENT){
2092
if(debug){
2093
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2094
" found\n", hookdir);
2095
}
2096
} else {
2097
perror_plus("open");
2098
}
2099
return;
2100
}
2101
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
runnable_hook, alphasort);
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
2109
1495
if(numhooks == -1){
2110
perror_plus("scandir");
2111
close(devnull);
2112
return;
2113
}
2114
struct dirent *direntry;
2115
int ret;
2116
for(int i = 0; i < numhooks; i++){
2117
direntry = direntries[i];
2118
if(debug){
2119
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2120
direntry->d_name);
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
2121
1503
}
2122
pid_t hook_pid = fork();
2123
if(hook_pid == 0){
2124
/* Child */
2125
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2127
if(errno != 0){
2128
perror_plus("Failed to raise privileges");
2129
_exit(EX_NOPERM);
2130
}
2131
/* Set group */
2132
errno = 0;
2133
ret = setgid(0);
2134
if(ret == -1){
2135
perror_plus("setgid");
2136
_exit(EX_NOPERM);
2137
}
2138
/* Reset supplementary groups */
2139
errno = 0;
2140
ret = setgroups(0, NULL);
2141
if(ret == -1){
2142
perror_plus("setgroups");
2143
_exit(EX_NOPERM);
2144
}
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2146
if(ret == -1){
2147
perror_plus("setenv");
2148
_exit(EX_OSERR);
2149
}
2150
ret = setenv("DEVICE", interface, 1);
2151
if(ret == -1){
2152
perror_plus("setenv");
2153
_exit(EX_OSERR);
2154
}
2155
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2156
if(ret == -1){
2157
perror_plus("setenv");
2158
_exit(EX_OSERR);
2159
}
2160
ret = setenv("MODE", mode, 1);
2161
if(ret == -1){
2162
perror_plus("setenv");
2163
_exit(EX_OSERR);
2164
}
2165
char *delaystring;
2166
ret = asprintf(&delaystring, "%f", (double)delay);
2167
if(ret == -1){
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
2168
1511
perror_plus("asprintf");
2169
_exit(EX_OSERR);
2170
}
2171
ret = setenv("DELAY", delaystring, 1);
2172
if(ret == -1){
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
2173
1570
free(delaystring);
2174
perror_plus("setenv");
2175
_exit(EX_OSERR);
2176
}
2177
free(delaystring);
2178
if(connect_to != NULL){
2179
ret = setenv("CONNECT", connect_to, 1);
2180
if(ret == -1){
2181
perror_plus("setenv");
2182
_exit(EX_OSERR);
2183
}
2184
}
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
2188
if(hook_fd == -1){
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2191
}
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2212
environ) == -1){
2213
perror_plus("fexecve");
2214
_exit(EXIT_FAILURE);
2215
}
2216
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
2222
int status;
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
perror_plus("waitpid");
2225
free(direntry);
2226
continue;
2227
}
2228
if(WIFEXITED(status)){
2229
if(WEXITSTATUS(status) != 0){
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
" with status %d\n", direntry->d_name,
2232
WEXITSTATUS(status));
2233
free(direntry);
2234
continue;
2235
}
2236
} else if(WIFSIGNALED(status)){
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
" signal %d\n", direntry->d_name,
2239
WTERMSIG(status));
2240
free(direntry);
2241
continue;
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
2242
1582
} else {
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
" crashed\n", direntry->d_name);
2245
free(direntry);
2246
continue;
2247
}
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2251
direntry->d_name);
2252
}
2253
free(direntry);
2254
}
2255
free(direntries);
2256
if(close(hookdir_fd) == -1){
2257
perror_plus("close");
2258
} else {
2259
hookdir_fd = -1;
2260
}
2261
close(devnull);
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
2262
1619
}
2263
1620
2264
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
2268
int ret;
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
2269
1627
struct ifreq network;
2270
1628
unsigned int if_index = if_nametoindex(interface);
2271
1629
if(if_index == 0){
2280
1638
}
2281
1639
2282
1640
if(not interface_is_up(interface)){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
2285
if(not get_flags(interface, &network)){
1641
if(not get_flags(interface, &network) and debug){
2286
1642
ret_errno = errno;
2287
1643
fprintf_plus(stderr, "Failed to get flags for interface "
2288
1644
"\"%s\"\n", interface);
2289
errno = old_errno;
2290
1645
return ret_errno;
2291
1646
}
2292
network.ifr_flags |= IFF_UP; /* set flag */
1647
network.ifr_flags |= IFF_UP;
2293
1648
2294
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2295
if(sd == -1){
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
2296
1651
ret_errno = errno;
2297
1652
perror_plus("socket");
2298
1653
errno = old_errno;
2299
1654
return ret_errno;
2300
1655
}
2301
1656
2302
1657
if(quit_now){
2303
ret = close(sd);
2304
if(ret == -1){
2305
perror_plus("close");
2306
}
1658
close(sd);
2307
1659
errno = old_errno;
2308
1660
return EINTR;
2309
1661
}
2313
1665
interface);
2314
1666
}
2315
1667
2316
/* Raise privileges */
2317
ret_errno = raise_privileges();
2318
if(ret_errno != 0){
2319
errno = ret_errno;
2320
perror_plus("Failed to raise privileges");
2321
}
1668
/* Raise priviliges */
1669
raise_privileges();
2322
1670
2323
1671
#ifdef __linux__
2324
int ret_linux;
2325
bool restore_loglevel = false;
2326
if(ret_errno == 0){
2327
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2328
messages about the network interface to mess up the prompt */
2329
ret_linux = klogctl(8, NULL, 5);
2330
if(ret_linux == -1){
2331
perror_plus("klogctl");
2332
} else {
2333
restore_loglevel = true;
2334
}
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
2335
1679
}
2336
1680
#endif /* __linux__ */
2337
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2338
ioctl_errno = errno;
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
2339
1683
#ifdef __linux__
2340
1684
if(restore_loglevel){
2341
1685
ret_linux = klogctl(7, NULL, 0);
2345
1689
}
2346
1690
#endif /* __linux__ */
2347
1691
2348
/* If raise_privileges() succeeded above */
2349
if(ret_errno == 0){
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2356
}
1692
/* Lower privileges */
1693
lower_privileges();
2357
1694
2358
1695
/* Close the socket */
2359
ret = close(sd);
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
1697
if(ret == -1){
2361
1698
perror_plus("close");
2362
1699
}
2363
1700
2364
1701
if(ret_setflags == -1){
2365
errno = ioctl_errno;
1702
errno = ret_errno;
2366
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2367
1704
errno = old_errno;
2368
return ioctl_errno;
1705
return ret_errno;
2369
1706
}
2370
1707
} else if(debug){
2371
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2374
1711
2375
1712
/* Sleep checking until interface is running.
2376
1713
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
1714
for(int i=0; i < delay * 4; i++){
2378
1715
if(interface_is_running(interface)){
2379
1716
break;
2380
1717
}
2389
1726
return 0;
2390
1727
}
2391
1728
2392
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2395
1734
struct ifreq network;
2396
1735
unsigned int if_index = if_nametoindex(interface);
2397
1736
if(if_index == 0){
2400
1739
return ENXIO;
2401
1740
}
2402
1741
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
2405
1742
if(not get_flags(interface, &network) and debug){
2406
1743
ret_errno = errno;
2407
1744
fprintf_plus(stderr, "Failed to get flags for interface "
2408
1745
"\"%s\"\n", interface);
2409
errno = old_errno;
2410
1746
return ret_errno;
2411
1747
}
2412
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2413
1749
2414
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2415
if(sd == -1){
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2416
1752
ret_errno = errno;
2417
1753
perror_plus("socket");
2418
1754
errno = old_errno;
2424
1760
interface);
2425
1761
}
2426
1762
2427
/* Raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
}
2433
2434
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2435
ioctl_errno = errno;
2436
2437
/* If raise_privileges() succeeded above */
2438
if(ret_errno == 0){
2439
/* Lower privileges */
2440
ret_errno = lower_privileges();
2441
if(ret_errno != 0){
2442
errno = ret_errno;
2443
perror_plus("Failed to lower privileges");
2444
}
2445
}
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
2446
1771
2447
1772
/* Close the socket */
2448
int ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
1774
if(ret == -1){
2450
1775
perror_plus("close");
2451
1776
}
2452
1777
2453
1778
if(ret_setflags == -1){
2454
errno = ioctl_errno;
1779
errno = ret_errno;
2455
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2456
1781
errno = old_errno;
2457
return ioctl_errno;
1782
return ret_errno;
2458
1783
}
2459
1784
} else if(debug){
2460
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2466
1791
}
2467
1792
2468
1793
int main(int argc, char *argv[]){
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
2482
1798
AvahiSServiceBrowser *sb = NULL;
2483
1799
error_t ret_errno;
2484
1800
int ret;
2487
1803
int exitcode = EXIT_SUCCESS;
2488
1804
char *interfaces_to_take_down = NULL;
2489
1805
size_t interfaces_to_take_down_size = 0;
2490
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2491
char old_tempdir[] = "/tmp/mandosXXXXXX";
2492
char *tempdir = NULL;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2493
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
1809
const char *seckey = PATHDIR "/" SECKEY;
2495
1810
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
const char *dh_params_file = NULL;
2501
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
2502
1813
2503
1814
bool gnutls_initialized = false;
2504
1815
bool gpgme_initialized = false;
2550
1861
{ .name = "pubkey", .key = 'p',
2551
1862
.arg = "FILE",
2552
1863
.doc = "OpenPGP public key file base name",
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
1864
.group = 2 },
2570
1865
{ .name = "dh-bits", .key = 129,
2571
1866
.arg = "BITS",
2572
1867
.doc = "Bit length of the prime number used in the"
2573
1868
" Diffie-Hellman key exchange",
2574
1869
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
2580
1870
{ .name = "priority", .key = 130,
2581
1871
.arg = "STRING",
2582
1872
.doc = "GnuTLS priority string for the TLS handshake",
2628
1918
case 'p': /* --pubkey */
2629
1919
pubkey = arg;
2630
1920
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
2641
1921
case 129: /* --dh-bits */
2642
1922
errno = 0;
2643
1923
tmpmax = strtoimax(arg, &tmp, 10);
2647
1927
}
2648
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2649
1929
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2653
1930
case 130: /* --priority */
2654
1931
mc.priority = arg;
2655
1932
break;
2678
1955
argp_state_help(state, state->out_stream,
2679
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
1958
case -3: /* --usage */
2683
1959
argp_state_help(state, state->out_stream,
2684
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
1961
case 'V': /* --version */
2687
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
1963
exit(argp_err_exit_status);
2697
1972
.args_doc = "",
2698
1973
.doc = "Mandos client -- Get and decrypt"
2699
1974
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2703
1978
case 0:
2704
1979
break;
2705
1980
case ENOMEM:
2706
1981
default:
2707
errno = ret_errno;
1982
errno = ret;
2708
1983
perror_plus("argp_parse");
2709
1984
exitcode = EX_OSERR;
2710
1985
goto end;
2713
1988
goto end;
2714
1989
}
2715
1990
}
2716
1991
2717
1992
{
2718
1993
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
1994
<http://bugs.debian.org/633582> */
2720
1995
2721
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2725
perror_plus("Failed to raise privileges");
2726
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2727
1998
struct stat st;
2728
1999
2729
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2743
2014
}
2744
2015
}
2745
2016
}
2746
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
2018
}
2748
2019
}
2749
2020
2750
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2752
2023
if(pubkey_fd == -1){
2764
2035
}
2765
2036
}
2766
2037
}
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2793
2042
/* Lower privileges */
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2797
perror_plus("Failed to lower privileges");
2798
}
2043
lower_privileges();
2799
2044
}
2800
2045
}
2801
2046
2825
2070
goto end;
2826
2071
}
2827
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2828
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2829
}
2830
run_network_hooks("start", interfaces_hooks != NULL ?
2831
interfaces_hooks : "", delay);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2832
2081
}
2833
2082
2834
2083
if(not debug){
2912
2161
2913
2162
/* If no interfaces were specified, make a list */
2914
2163
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2164
struct dirent **direntries;
2916
2165
/* Look for any good interfaces */
2917
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2918
2167
alphasort);
2922
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2923
2172
direntries[i]->d_name);
2924
2173
if(ret_errno != 0){
2925
errno = ret_errno;
2926
2174
perror_plus("argz_add");
2927
free(direntries[i]);
2928
2175
continue;
2929
2176
}
2930
2177
if(debug){
2931
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2932
2179
direntries[i]->d_name);
2933
2180
}
2934
free(direntries[i]);
2935
2181
}
2936
2182
free(direntries);
2937
2183
} else {
2938
if(ret == 0){
2939
free(direntries);
2940
}
2184
free(direntries);
2941
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2942
2186
exitcode = EXIT_FAILURE;
2943
2187
goto end;
2966
2210
break;
2967
2211
}
2968
2212
bool interface_was_up = interface_is_up(interface);
2969
errno = bring_up_interface(interface, delay);
2213
ret = bring_up_interface(interface, delay);
2970
2214
if(not interface_was_up){
2971
if(errno != 0){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2974
2218
} else {
2975
errno = argz_add(&interfaces_to_take_down,
2976
&interfaces_to_take_down_size,
2977
interface);
2978
if(errno != 0){
2979
perror_plus("argz_add");
2980
}
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2981
2222
}
2982
2223
}
2983
2224
}
2999
2240
goto end;
3000
2241
}
3001
2242
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
3009
2244
if(ret == -1){
3010
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
3011
2246
exitcode = EX_UNAVAILABLE;
3018
2253
goto end;
3019
2254
}
3020
2255
3021
/* Try /run/tmp before /tmp */
3022
tempdir = mkdtemp(run_tempdir);
3023
if(tempdir == NULL and errno == ENOENT){
3024
if(debug){
3025
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3026
run_tempdir, old_tempdir);
3027
}
3028
tempdir = mkdtemp(old_tempdir);
3029
}
3030
if(tempdir == NULL){
2256
if(mkdtemp(tempdir) == NULL){
3031
2257
perror_plus("mkdtemp");
3032
2258
goto end;
3033
2259
}
2260
tempdir_created = true;
3034
2261
3035
2262
if(quit_now){
3036
2263
goto end;
3111
2338
sleep((unsigned int)retry_interval);
3112
2339
}
3113
2340
3114
if(not quit_now){
2341
if (not quit_now){
3115
2342
exitcode = EXIT_SUCCESS;
3116
2343
}
3117
2344
3133
2360
3134
2361
/* Allocate a new server */
3135
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
2363
&config, NULL, NULL, &ret_errno);
3137
2364
3138
2365
/* Free the Avahi configuration data */
3139
2366
avahi_server_config_free(&config);
3142
2369
/* Check if creating the Avahi server object succeeded */
3143
2370
if(mc.server == NULL){
3144
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
2372
avahi_strerror(ret_errno));
3146
2373
exitcode = EX_UNAVAILABLE;
3147
2374
goto end;
3148
2375
}
3172
2399
if(debug){
3173
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
3174
2401
}
3175
2402
3176
2403
ret = avahi_loop_with_timeout(simple_poll,
3177
2404
(int)(retry_interval * 1000), &mc);
3178
2405
if(debug){
3183
2410
end:
3184
2411
3185
2412
if(debug){
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
2414
}
3194
2415
3195
2416
/* Cleanup things */
3206
2427
3207
2428
if(gnutls_initialized){
3208
2429
gnutls_certificate_free_credentials(mc.cred);
2430
gnutls_global_deinit();
3209
2431
gnutls_dh_params_deinit(mc.dh_params);
3210
2432
}
3211
2433
3219
2441
mc.current_server->prev->next = NULL;
3220
2442
while(mc.current_server != NULL){
3221
2443
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
3230
2444
free(mc.current_server);
3231
2445
mc.current_server = next;
3232
2446
}
3233
2447
}
3234
2448
3235
/* Re-raise privileges */
2449
/* Re-raise priviliges */
3236
2450
{
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
3240
perror_plus("Failed to raise privileges");
3241
} else {
3242
3243
/* Run network hooks */
3244
run_network_hooks("stop", interfaces_hooks != NULL ?
3245
interfaces_hooks : "", delay);
3246
3247
/* Take down the network interfaces which were brought up */
3248
{
3249
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
3256
perror_plus("Failed to take down interface");
3257
}
3258
}
3259
if(debug and (interfaces_to_take_down == NULL)){
3260
fprintf_plus(stderr, "No interfaces needed to be taken"
3261
" down\n");
3262
}
3263
}
3264
}
3265
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
3269
perror_plus("Failed to lower privileges permanently");
3270
}
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
3271
2476
}
3272
2477
3273
2478
free(interfaces_to_take_down);
3274
2479
free(interfaces_hooks);
3275
2480
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
2481
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
3278
2483
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
3292
2488
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
3328
}
3329
3330
/* Removes the GPGME temp directory and all files inside */
3331
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2503
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2514
}
3333
2515
}
3334
2516
3335
2517
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0