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- Committer: Teddy Hogeborn
- Date: 2018-08-15 09:13:36 UTC
- Revision ID: teddy@recompile.se-20180815091336-fxwk6vbop0m8xyur
Linking flags correction
* Makefile (CFLAGS): Remove "$(GNUTLS_CFLAGS) $(AVAHI_CFLAGS)
$(GPGME_CFLAGS)", since these libraries are not
used by all programs.
(plugins.d/mandos-client): Add "$(GNUTLS_CFLAGS) $(AVAHI_CFLAGS)
$(GPGME_CFLAGS)".
* Makefile (CFLAGS): Remove "$(GNUTLS_CFLAGS) $(AVAHI_CFLAGS)
$(GPGME_CFLAGS)", since these libraries are not
used by all programs.
(plugins.d/mandos-client): Add "$(GNUTLS_CFLAGS) $(AVAHI_CFLAGS)
$(GPGME_CFLAGS)".
- files added:
- bugs.xml
- debian/upstream
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
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 <assert.h> /* assert() */
65
#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,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
87
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
90
104
91
105
#ifdef __linux__
92
106
#include <sys/klog.h> /* klogctl() */
134
148
static const char sys_class_net[] = "/sys/class/net";
135
149
char *connect_to = NULL;
136
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
137
154
138
155
/* Doubly linked list that need to be circularly linked when used */
139
156
typedef struct server{
140
157
const char *ip;
141
uint16_t port;
158
in_port_t port;
142
159
AvahiIfIndex if_index;
143
160
int af;
144
161
struct timespec last_seen;
148
165
149
166
/* Used for passing in values through the Avahi callback functions */
150
167
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
168
AvahiServer *server;
153
169
gnutls_certificate_credentials_t cred;
154
170
unsigned int dh_bits;
156
172
const char *priority;
157
173
gpgme_ctx_t ctx;
158
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
159
177
} mandos_context;
160
178
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
166
181
167
182
sig_atomic_t quit_now = 0;
168
183
int signal_received = 0;
169
184
170
185
/* Function to use when printing errors */
171
186
void perror_plus(const char *print_text){
187
int e = errno;
172
188
fprintf(stderr, "Mandos plugin %s: ",
173
189
program_invocation_short_name);
190
errno = e;
174
191
perror(print_text);
175
192
}
176
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
195
int fprintf_plus(FILE *stream, const char *format, ...){
178
196
va_list ap;
179
197
va_start (ap, format);
180
198
181
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
200
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
202
}
185
203
186
204
/*
188
206
* bytes. "buffer_capacity" is how much is currently allocated,
189
207
* "buffer_length" is how much is already used.
190
208
*/
209
__attribute__((nonnull, warn_unused_result))
191
210
size_t incbuffer(char **buffer, size_t buffer_length,
192
211
size_t buffer_capacity){
193
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
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;
196
219
return 0;
197
220
}
221
*buffer = new_buf;
198
222
buffer_capacity += BUFFER_SIZE;
199
223
}
200
224
return buffer_capacity;
201
225
}
202
226
203
227
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
206
231
int ret;
207
232
server *new_server = malloc(sizeof(server));
208
233
if(new_server == NULL){
209
234
perror_plus("malloc");
210
return -1;
235
return false;
211
236
}
212
237
*new_server = (server){ .ip = strdup(ip),
213
238
.port = port,
215
240
.af = af };
216
241
if(new_server->ip == NULL){
217
242
perror_plus("strdup");
218
return -1;
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);
258
return false;
219
259
}
220
260
/* Special case of first server */
221
if (mc.current_server == NULL){
261
if(*current_server == NULL){
222
262
new_server->next = new_server;
223
263
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
264
*current_server = new_server;
226
265
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
229
269
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
270
(*current_server)->prev = new_server;
271
}
272
return true;
238
273
}
239
274
240
275
/*
241
276
* Initialize GPGME.
242
277
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
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){
245
283
gpgme_error_t rc;
246
284
gpgme_engine_info_t engine_info;
247
285
248
249
286
/*
250
287
* Helper function to insert pub and seckey to the engine keyring.
251
288
*/
252
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
253
290
int ret;
254
291
int fd;
255
292
gpgme_data_t pgp_data;
267
304
return false;
268
305
}
269
306
270
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
271
308
if(rc != GPG_ERR_NO_ERROR){
272
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
310
gpgme_strsource(rc), gpgme_strerror(rc));
274
311
return false;
275
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
}
276
388
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
278
390
if(ret == -1){
279
391
perror_plus("close");
280
392
}
317
429
}
318
430
319
431
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
432
rc = gpgme_new(&(mc->ctx));
321
433
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
325
436
return false;
326
437
}
327
438
336
447
* Decrypt OpenPGP data.
337
448
* Returns -1 on error
338
449
*/
450
__attribute__((nonnull, warn_unused_result))
339
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
452
size_t crypto_size,
341
char **plaintext){
453
char **plaintext,
454
mandos_context *mc){
342
455
gpgme_data_t dh_crypto, dh_plain;
343
456
gpgme_error_t rc;
344
457
ssize_t ret;
361
474
/* Create new empty GPGME data buffer for the plaintext */
362
475
rc = gpgme_data_new(&dh_plain);
363
476
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
366
478
gpgme_strsource(rc), gpgme_strerror(rc));
367
479
gpgme_data_release(dh_crypto);
368
480
return -1;
370
482
371
483
/* Decrypt data from the cryptotext data buffer to the plaintext
372
484
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
486
if(rc != GPG_ERR_NO_ERROR){
375
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
488
gpgme_strsource(rc), gpgme_strerror(rc));
377
489
plaintext_length = -1;
378
490
if(debug){
379
491
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
492
result = gpgme_op_decrypt_result(mc->ctx);
381
493
if(result == NULL){
382
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
495
} else {
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
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");
388
502
if(result->file_name != NULL){
389
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
390
504
}
391
gpgme_recipient_t recipient;
392
recipient = result->recipients;
393
while(recipient != NULL){
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
394
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
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);
398
511
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
401
recipient = recipient->next;
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
402
513
}
403
514
}
404
515
}
460
571
return plaintext_length;
461
572
}
462
573
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
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){
583
const char *ret = gnutls_strerror(value);
584
return safe_string(ret);
469
585
}
470
586
471
587
/* GnuTLS log function callback */
588
__attribute__((nonnull))
472
589
static void debuggnutls(__attribute__((unused)) int level,
473
590
const char* string){
474
591
fprintf_plus(stderr, "GnuTLS: %s", string);
475
592
}
476
593
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
477
595
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
mandos_context *mc){
479
599
int ret;
600
unsigned int uret;
480
601
481
602
if(debug){
482
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
483
604
}
484
605
485
ret = gnutls_global_init();
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
489
return -1;
490
}
491
492
606
if(debug){
493
607
/* "Use a log level over 10 to enable all debugging options."
494
608
* - GnuTLS manual
498
612
}
499
613
500
614
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
615
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
616
if(ret != GNUTLS_E_SUCCESS){
503
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
618
safer_gnutls_strerror(ret));
505
gnutls_global_deinit();
506
619
return -1;
507
620
}
508
621
514
627
}
515
628
516
629
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
630
(mc->cred, pubkeyfilename, seckeyfilename,
518
631
GNUTLS_OPENPGP_FMT_BASE64);
519
632
if(ret != GNUTLS_E_SUCCESS){
520
633
fprintf_plus(stderr,
526
639
}
527
640
528
641
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
642
ret = gnutls_dh_params_init(&mc->dh_params);
530
643
if(ret != GNUTLS_E_SUCCESS){
531
644
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
645
" initialization: %s\n",
533
646
safer_gnutls_strerror(ret));
534
647
goto globalfail;
535
648
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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
}
826
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
827
545
828
return 0;
546
829
547
830
globalfail:
548
831
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
832
gnutls_certificate_free_credentials(mc->cred);
833
gnutls_dh_params_deinit(mc->dh_params);
552
834
return -1;
553
835
}
554
836
555
static int init_gnutls_session(gnutls_session_t *session){
837
__attribute__((nonnull, warn_unused_result))
838
static int init_gnutls_session(gnutls_session_t *session,
839
mandos_context *mc){
556
840
int ret;
557
841
/* GnuTLS session creation */
558
842
do {
570
854
{
571
855
const char *err;
572
856
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
857
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
858
if(quit_now){
575
859
gnutls_deinit(*session);
576
860
return -1;
587
871
588
872
do {
589
873
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
874
mc->cred);
591
875
if(quit_now){
592
876
gnutls_deinit(*session);
593
877
return -1;
603
887
/* ignore client certificate if any. */
604
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
889
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
608
890
return 0;
609
891
}
610
892
612
894
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
613
895
__attribute__((unused)) const char *txt){}
614
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
615
1115
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
1116
__attribute__((nonnull, warn_unused_result))
1117
static int start_mandos_communication(const char *ip, in_port_t port,
617
1118
AvahiIfIndex if_index,
618
int af){
1119
int af, mandos_context *mc){
619
1120
int ret, tcp_sd = -1;
620
1121
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1122
struct sockaddr_storage to;
625
1123
char *buffer = NULL;
626
1124
char *decrypted_buffer = NULL;
627
1125
size_t buffer_length = 0;
630
1128
int retval = -1;
631
1129
gnutls_session_t session;
632
1130
int pf; /* Protocol family */
1131
bool route_added = false;
633
1132
634
1133
errno = 0;
635
1134
651
1150
return -1;
652
1151
}
653
1152
654
ret = init_gnutls_session(&session);
1153
/* If the interface is specified and we have a list of interfaces */
1154
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1155
/* Check if the interface is one of the interfaces we are using */
1156
bool match = false;
1157
{
1158
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
match = true;
1164
break;
1165
}
1166
}
1167
}
1168
if(not match){
1169
/* This interface does not match any in the list, so we don't
1170
connect to the server */
1171
if(debug){
1172
char interface[IF_NAMESIZE];
1173
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1174
perror_plus("if_indextoname");
1175
} else {
1176
fprintf_plus(stderr, "Skipping server on non-used interface"
1177
" \"%s\"\n",
1178
if_indextoname((unsigned int)if_index,
1179
interface));
1180
}
1181
}
1182
return -1;
1183
}
1184
}
1185
1186
ret = init_gnutls_session(&session, mc);
655
1187
if(ret != 0){
656
1188
return -1;
657
1189
}
658
1190
659
1191
if(debug){
660
1192
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
1193
PRIuMAX "\n", ip, (uintmax_t)port);
662
1194
}
663
1195
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
1197
if(tcp_sd < 0){
666
1198
int e = errno;
667
1199
perror_plus("socket");
674
1206
goto mandos_end;
675
1207
}
676
1208
677
memset(&to, 0, sizeof(to));
678
1209
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
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);
681
1213
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
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);
684
1217
}
685
1218
if(ret < 0 ){
686
1219
int e = errno;
695
1228
goto mandos_end;
696
1229
}
697
1230
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
1234
if(if_index == AVAHI_IF_UNSPEC){
706
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
707
1236
" incomplete without a network interface\n");
709
1238
goto mandos_end;
710
1239
}
711
1240
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
1242
}
714
1243
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
1245
}
719
1246
720
1247
if(quit_now){
728
1255
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
1256
perror_plus("if_indextoname");
730
1257
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1258
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1259
"\n", ip, interface, (uintmax_t)port);
733
1260
}
734
1261
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1262
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1263
ip, (uintmax_t)port);
737
1264
}
738
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
1266
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
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;
779
1347
}
780
1348
781
1349
const char *out = mandos_protocol_version;
817
1385
goto mandos_end;
818
1386
}
819
1387
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1388
/* This casting via intptr_t is to eliminate warning about casting
1389
an int to a pointer type. This is exactly how the GnuTLS Guile
1390
function "set-session-transport-fd!" does it. */
1391
gnutls_transport_set_ptr(session,
1392
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
1393
823
1394
if(quit_now){
824
1395
errno = EINTR;
929
1500
if(buffer_length > 0){
930
1501
ssize_t decrypted_buffer_size;
931
1502
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
1503
&decrypted_buffer, mc);
933
1504
if(decrypted_buffer_size >= 0){
934
1505
1506
clearerr(stdout);
935
1507
written = 0;
936
1508
while(written < (size_t) decrypted_buffer_size){
937
1509
if(quit_now){
953
1525
}
954
1526
written += (size_t)ret;
955
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
}
956
1538
retval = 0;
957
1539
}
958
1540
}
961
1543
962
1544
mandos_end:
963
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
}
964
1552
int e = errno;
965
1553
free(decrypted_buffer);
966
1554
free(buffer);
967
1555
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1556
ret = close(tcp_sd);
969
1557
}
970
1558
if(ret == -1){
971
1559
if(e == 0){
996
1584
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1585
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1586
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1587
void *mc){
1588
if(r == NULL){
1589
return;
1590
}
1001
1591
1002
1592
/* Called whenever a service has been resolved successfully or
1003
1593
timed out */
1004
1594
1005
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1006
1597
return;
1007
1598
}
1008
1599
1012
1603
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1604
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1605
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1016
1608
break;
1017
1609
1018
1610
case AVAHI_RESOLVER_FOUND:
1024
1616
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1617
host_name, ip, (intmax_t)interface, port);
1026
1618
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1619
int ret = start_mandos_communication(ip, (in_port_t)port,
1620
interface,
1621
avahi_proto_to_af(proto),
1622
mc);
1029
1623
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1624
avahi_simple_poll_quit(simple_poll);
1031
1625
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1626
if(not add_server(ip, (in_port_t)port, interface,
1627
avahi_proto_to_af(proto),
1628
&((mandos_context*)mc)->current_server)){
1629
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1630
" list\n", name);
1631
}
1034
1632
}
1035
1633
}
1036
1634
}
1046
1644
const char *domain,
1047
1645
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1646
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1647
void *mc){
1648
if(b == NULL){
1649
return;
1650
}
1051
1651
1052
1652
/* Called whenever a new services becomes available on the LAN or
1053
1653
is removed from the LAN */
1061
1661
case AVAHI_BROWSER_FAILURE:
1062
1662
1063
1663
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1664
avahi_strerror(avahi_server_errno
1665
(((mandos_context*)mc)->server)));
1666
avahi_simple_poll_quit(simple_poll);
1066
1667
return;
1067
1668
1068
1669
case AVAHI_BROWSER_NEW:
1071
1672
the callback function is called the Avahi server will free the
1072
1673
resolver for us. */
1073
1674
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1675
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1676
interface, protocol, name, type,
1677
domain, protocol, 0,
1678
resolve_callback, mc) == NULL)
1077
1679
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1680
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1681
avahi_strerror(avahi_server_errno
1682
(((mandos_context*)mc)->server)));
1080
1683
break;
1081
1684
1082
1685
case AVAHI_BROWSER_REMOVE:
1101
1704
signal_received = sig;
1102
1705
int old_errno = errno;
1103
1706
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1707
if(simple_poll != NULL){
1708
avahi_simple_poll_quit(simple_poll);
1106
1709
}
1107
1710
errno = old_errno;
1108
1711
}
1109
1712
1713
__attribute__((nonnull, warn_unused_result))
1110
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1715
int ret;
1716
int old_errno;
1112
1717
1113
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1719
if(s < 0){
1720
old_errno = errno;
1115
1721
perror_plus("socket");
1722
errno = old_errno;
1116
1723
return false;
1117
1724
}
1118
strcpy(ifr->ifr_name, ifname);
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1119
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1728
if(ret == -1){
1121
1729
if(debug){
1730
old_errno = errno;
1122
1731
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1123
1738
}
1124
1739
return false;
1125
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1126
1746
return true;
1127
1747
}
1128
1748
1749
__attribute__((nonnull, warn_unused_result))
1129
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1751
1131
1752
/* Reject the loopback device */
1173
1794
* corresponds to an acceptable network device.
1174
1795
* (This function is passed to scandir(3) as a filter function.)
1175
1796
*/
1797
__attribute__((nonnull, warn_unused_result))
1176
1798
int good_interface(const struct dirent *if_entry){
1177
1799
if(if_entry->d_name[0] == '.'){
1178
1800
return 0;
1194
1816
}
1195
1817
1196
1818
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1819
* This function determines if a network interface is up.
1820
*/
1821
__attribute__((nonnull, warn_unused_result))
1822
bool interface_is_up(const char *interface){
1823
struct ifreq ifr;
1824
if(not get_flags(interface, &ifr)){
1825
if(debug){
1826
fprintf_plus(stderr, "Failed to get flags for interface "
1827
"\"%s\"\n", interface);
1828
}
1829
return false;
1830
}
1831
1832
return (bool)(ifr.ifr_flags & IFF_UP);
1833
}
1834
1835
/*
1836
* This function determines if a network interface is running
1837
*/
1838
__attribute__((nonnull, warn_unused_result))
1839
bool interface_is_running(const char *interface){
1840
struct ifreq ifr;
1841
if(not get_flags(interface, &ifr)){
1842
if(debug){
1843
fprintf_plus(stderr, "Failed to get flags for interface "
1844
"\"%s\"\n", interface);
1845
}
1846
return false;
1847
}
1848
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1850
}
1851
1852
__attribute__((nonnull, pure, warn_unused_result))
1239
1853
int notdotentries(const struct dirent *direntry){
1240
1854
/* Skip "." and ".." */
1241
1855
if(direntry->d_name[0] == '.'
1248
1862
}
1249
1863
1250
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1251
1866
int runnable_hook(const struct dirent *direntry){
1252
1867
int ret;
1253
1868
size_t sret;
1261
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
1877
"abcdefghijklmnopqrstuvwxyz"
1263
1878
"0123456789"
1264
"_-");
1879
"_.-");
1265
1880
if((direntry->d_name)[sret] != '\0'){
1266
1881
/* Contains non-allowed characters */
1267
1882
if(debug){
1271
1886
return 0;
1272
1887
}
1273
1888
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1282
1890
if(ret == -1){
1283
1891
if(debug){
1284
1892
perror_plus("Could not stat hook");
1301
1909
}
1302
1910
return 0;
1303
1911
}
1912
if(debug){
1913
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1914
direntry->d_name);
1915
}
1304
1916
return 1;
1305
1917
}
1306
1918
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1919
__attribute__((nonnull, warn_unused_result))
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1921
mandos_context *mc){
1308
1922
int ret;
1309
1923
struct timespec now;
1310
1924
struct timespec waited_time;
1311
1925
intmax_t block_time;
1312
1926
1313
1927
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1928
if(mc->current_server == NULL){
1929
if(debug){
1316
1930
fprintf_plus(stderr, "Wait until first server is found."
1317
1931
" No timeout!\n");
1318
1932
}
1319
1933
ret = avahi_simple_poll_iterate(s, -1);
1320
1934
} else {
1321
if (debug){
1935
if(debug){
1322
1936
fprintf_plus(stderr, "Check current_server if we should run"
1323
1937
" it, or wait\n");
1324
1938
}
1331
1945
/* Calculating in ms how long time between now and server
1332
1946
who we visted longest time ago. Now - last seen. */
1333
1947
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1948
- mc->current_server->last_seen.tv_sec);
1335
1949
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1950
- mc->current_server->last_seen.tv_nsec);
1337
1951
/* total time is 10s/10,000ms.
1338
1952
Converting to s from ms by dividing by 1,000,
1339
1953
and ns to ms by dividing by 1,000,000. */
1341
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1957
1344
if (debug){
1958
if(debug){
1345
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1960
block_time);
1347
1961
}
1348
1962
1349
1963
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1964
ret = start_mandos_communication(mc->current_server->ip,
1965
mc->current_server->port,
1966
mc->current_server->if_index,
1967
mc->current_server->af, mc);
1354
1968
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1969
avahi_simple_poll_quit(s);
1356
1970
return 0;
1357
1971
}
1358
1972
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1973
&mc->current_server->last_seen);
1360
1974
if(ret == -1){
1361
1975
perror_plus("clock_gettime");
1362
1976
return -1;
1363
1977
}
1364
mc.current_server = mc.current_server->next;
1978
mc->current_server = mc->current_server->next;
1365
1979
block_time = 0; /* Call avahi to find new Mandos
1366
1980
servers, but don't block */
1367
1981
}
1369
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1984
}
1371
1985
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1986
if(ret > 0 or errno != EINTR){
1373
1987
return (ret != 1) ? ret : 0;
1374
1988
}
1375
1989
}
1376
1990
}
1377
1991
}
1378
1992
1379
bool run_network_hooks(const char *mode, const char *interface,
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1380
1995
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
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);
1386
2019
if(numhooks == -1){
1387
2020
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[i];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
2021
close(devnull);
2022
return;
2023
}
2024
struct dirent *direntry;
2025
int ret;
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);
2031
}
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){
1395
2078
perror_plus("asprintf");
1396
continue;
1397
}
1398
if(debug){
1399
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1400
direntry->d_name);
1401
}
1402
pid_t hook_pid = fork();
1403
if(hook_pid == 0){
1404
/* Child */
1405
dup2(devnull, STDIN_FILENO);
1406
close(devnull);
1407
dup2(STDERR_FILENO, STDOUT_FILENO);
1408
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1409
if(ret == -1){
1410
perror_plus("setenv");
1411
return false;
1412
}
1413
ret = setenv("DEVICE", interface, 1);
1414
if(ret == -1){
1415
perror_plus("setenv");
1416
return false;
1417
}
1418
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1419
if(ret == -1){
1420
perror_plus("setenv");
1421
return false;
1422
}
1423
ret = setenv("MODE", mode, 1);
1424
if(ret == -1){
1425
perror_plus("setenv");
1426
return false;
1427
}
1428
char *delaystring;
1429
ret = asprintf(&delaystring, "%f", delay);
1430
if(ret == -1){
1431
perror_plus("asprintf");
1432
return false;
1433
}
1434
ret = setenv("DELAY", delaystring, 1);
1435
if(ret == -1){
1436
free(delaystring);
1437
perror_plus("setenv");
1438
return false;
1439
}
2079
_exit(EX_OSERR);
2080
}
2081
ret = setenv("DELAY", delaystring, 1);
2082
if(ret == -1){
1440
2083
free(delaystring);
1441
ret = execl(fullname, direntry->d_name, mode, NULL);
1442
perror_plus("execl");
1443
} else {
1444
int status;
1445
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1446
perror_plus("waitpid");
1447
free(fullname);
1448
continue;
1449
}
1450
if(WIFEXITED(status)){
1451
if(WEXITSTATUS(status) != 0){
1452
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1453
" with status %d\n", direntry->d_name,
1454
WEXITSTATUS(status));
1455
free(fullname);
1456
continue;
1457
}
1458
} else if(WIFSIGNALED(status)){
1459
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1460
" signal %d\n", direntry->d_name,
1461
WTERMSIG(status));
1462
free(fullname);
1463
continue;
1464
} else {
1465
fprintf_plus(stderr, "Warning: network hook \"%s\""
1466
" crashed\n", direntry->d_name);
1467
free(fullname);
1468
continue;
1469
}
1470
}
1471
free(fullname);
1472
if(quit_now){
1473
break;
1474
}
1475
}
1476
close(devnull);
1477
}
1478
return true;
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;
2152
} else {
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);
2172
}
2173
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;
2179
struct ifreq network;
2180
unsigned int if_index = if_nametoindex(interface);
2181
if(if_index == 0){
2182
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2183
errno = old_errno;
2184
return ENXIO;
2185
}
2186
2187
if(quit_now){
2188
errno = old_errno;
2189
return EINTR;
2190
}
2191
2192
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
2196
ret_errno = errno;
2197
fprintf_plus(stderr, "Failed to get flags for interface "
2198
"\"%s\"\n", interface);
2199
errno = old_errno;
2200
return ret_errno;
2201
}
2202
network.ifr_flags |= IFF_UP; /* set flag */
2203
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2205
if(sd == -1){
2206
ret_errno = errno;
2207
perror_plus("socket");
2208
errno = old_errno;
2209
return ret_errno;
2210
}
2211
2212
if(quit_now){
2213
ret = close(sd);
2214
if(ret == -1){
2215
perror_plus("close");
2216
}
2217
errno = old_errno;
2218
return EINTR;
2219
}
2220
2221
if(debug){
2222
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2223
interface);
2224
}
2225
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
}
2232
2233
#ifdef __linux__
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
}
2245
}
2246
#endif /* __linux__ */
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
2249
#ifdef __linux__
2250
if(restore_loglevel){
2251
ret_linux = klogctl(7, NULL, 0);
2252
if(ret_linux == -1){
2253
perror_plus("klogctl");
2254
}
2255
}
2256
#endif /* __linux__ */
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2282
interface);
2283
}
2284
2285
/* Sleep checking until interface is running.
2286
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
2288
if(interface_is_running(interface)){
2289
break;
2290
}
2291
struct timespec sleeptime = { .tv_nsec = 250000000 };
2292
ret = nanosleep(&sleeptime, NULL);
2293
if(ret == -1 and errno != EINTR){
2294
perror_plus("nanosleep");
2295
}
2296
}
2297
2298
errno = old_errno;
2299
return 0;
2300
}
2301
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
2305
struct ifreq network;
2306
unsigned int if_index = if_nametoindex(interface);
2307
if(if_index == 0){
2308
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2309
errno = old_errno;
2310
return ENXIO;
2311
}
2312
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network) and debug){
2316
ret_errno = errno;
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
return ret_errno;
2321
}
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2323
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
2326
ret_errno = errno;
2327
perror_plus("socket");
2328
errno = old_errno;
2329
return ret_errno;
2330
}
2331
2332
if(debug){
2333
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2334
interface);
2335
}
2336
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
}
2356
2357
/* Close the socket */
2358
int ret = close(sd);
2359
if(ret == -1){
2360
perror_plus("close");
2361
}
2362
2363
if(ret_setflags == -1){
2364
errno = ioctl_errno;
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2366
errno = old_errno;
2367
return ioctl_errno;
2368
}
2369
} else if(debug){
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2371
interface);
2372
}
2373
2374
errno = old_errno;
2375
return 0;
1479
2376
}
1480
2377
1481
2378
int main(int argc, char *argv[]){
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 };
1482
2384
AvahiSServiceBrowser *sb = NULL;
1483
int error;
2385
error_t ret_errno;
1484
2386
int ret;
1485
2387
intmax_t tmpmax;
1486
2388
char *tmp;
1487
2389
int exitcode = EXIT_SUCCESS;
1488
const char *interface = "";
1489
struct ifreq network;
1490
int sd = -1;
1491
bool take_down_interface = false;
1492
uid_t uid;
1493
gid_t gid;
1494
char tempdir[] = "/tmp/mandosXXXXXX";
1495
bool tempdir_created = false;
2390
char *interfaces_to_take_down = NULL;
2391
size_t interfaces_to_take_down_size = 0;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
1496
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1497
2396
const char *seckey = PATHDIR "/" SECKEY;
1498
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
char *interfaces_hooks = NULL;
1499
2400
1500
2401
bool gnutls_initialized = false;
1501
2402
bool gpgme_initialized = false;
1553
2454
.doc = "Bit length of the prime number used in the"
1554
2455
" Diffie-Hellman key exchange",
1555
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 },
1556
2462
{ .name = "priority", .key = 130,
1557
2463
.arg = "STRING",
1558
2464
.doc = "GnuTLS priority string for the TLS handshake",
1563
2469
.group = 2 },
1564
2470
{ .name = "retry", .key = 132,
1565
2471
.arg = "SECONDS",
1566
.doc = "Retry interval used when denied by the mandos server",
2472
.doc = "Retry interval used when denied by the Mandos server",
1567
2473
.group = 2 },
1568
2474
{ .name = "network-hook-dir", .key = 133,
1569
2475
.arg = "DIR",
1592
2498
connect_to = arg;
1593
2499
break;
1594
2500
case 'i': /* --interface */
1595
interface = arg;
2501
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2502
arg, (int)',');
2503
if(ret_errno != 0){
2504
argp_error(state, "%s", strerror(ret_errno));
2505
}
1596
2506
break;
1597
2507
case 's': /* --seckey */
1598
2508
seckey = arg;
1609
2519
}
1610
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1611
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
1612
2525
case 130: /* --priority */
1613
2526
mc.priority = arg;
1614
2527
break;
1641
2554
argp_state_help(state, state->out_stream,
1642
2555
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1643
2556
case 'V': /* --version */
1644
fprintf_plus(state->out_stream,
1645
"Mandos plugin mandos-client: ");
1646
2557
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1647
2558
exit(argp_err_exit_status);
1648
2559
break;
1656
2567
.args_doc = "",
1657
2568
.doc = "Mandos client -- Get and decrypt"
1658
2569
" passwords from a Mandos server" };
1659
ret = argp_parse(&argp, argc, argv,
1660
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1661
switch(ret){
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
1662
2573
case 0:
1663
2574
break;
1664
2575
case ENOMEM:
1665
2576
default:
1666
errno = ret;
2577
errno = ret_errno;
1667
2578
perror_plus("argp_parse");
1668
2579
exitcode = EX_OSERR;
1669
2580
goto end;
1672
2583
goto end;
1673
2584
}
1674
2585
}
1675
1676
if(getuid() == 0){
2586
2587
{
1677
2588
/* Work around Debian bug #633582:
1678
<http://bugs.debian.org/633582> */
1679
struct stat st;
1680
1681
/* Re-raise priviliges */
1682
errno = 0;
1683
ret = seteuid(0);
1684
if(ret == -1){
1685
perror_plus("seteuid");
1686
}
1687
1688
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1689
int seckey_fd = open(seckey, O_RDONLY);
1690
if(seckey_fd == -1){
1691
perror_plus("open");
1692
} else {
1693
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1694
if(ret == -1){
1695
perror_plus("fstat");
1696
} else {
1697
if(S_ISREG(st.st_mode)
1698
and st.st_uid == 0 and st.st_gid == 0){
1699
ret = fchown(seckey_fd, uid, gid);
1700
if(ret == -1){
1701
perror_plus("fchown");
1702
}
1703
}
1704
}
1705
TEMP_FAILURE_RETRY(close(seckey_fd));
1706
}
1707
}
1708
1709
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1710
int pubkey_fd = open(pubkey, O_RDONLY);
1711
if(pubkey_fd == -1){
1712
perror_plus("open");
1713
} else {
1714
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1715
if(ret == -1){
1716
perror_plus("fstat");
1717
} else {
1718
if(S_ISREG(st.st_mode)
1719
and st.st_uid == 0 and st.st_gid == 0){
1720
ret = fchown(pubkey_fd, uid, gid);
1721
if(ret == -1){
1722
perror_plus("fchown");
1723
}
1724
}
1725
}
1726
TEMP_FAILURE_RETRY(close(pubkey_fd));
1727
}
1728
}
1729
1730
/* Lower privileges */
1731
errno = 0;
1732
ret = seteuid(uid);
1733
if(ret == -1){
1734
perror_plus("seteuid");
2589
<https://bugs.debian.org/633582> */
2590
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to raise privileges");
2596
} else {
2597
struct stat st;
2598
2599
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2600
int seckey_fd = open(seckey, O_RDONLY);
2601
if(seckey_fd == -1){
2602
perror_plus("open");
2603
} else {
2604
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2605
if(ret == -1){
2606
perror_plus("fstat");
2607
} else {
2608
if(S_ISREG(st.st_mode)
2609
and st.st_uid == 0 and st.st_gid == 0){
2610
ret = fchown(seckey_fd, uid, gid);
2611
if(ret == -1){
2612
perror_plus("fchown");
2613
}
2614
}
2615
}
2616
close(seckey_fd);
2617
}
2618
}
2619
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2622
if(pubkey_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2626
if(ret == -1){
2627
perror_plus("fstat");
2628
} else {
2629
if(S_ISREG(st.st_mode)
2630
and st.st_uid == 0 and st.st_gid == 0){
2631
ret = fchown(pubkey_fd, uid, gid);
2632
if(ret == -1){
2633
perror_plus("fchown");
2634
}
2635
}
2636
}
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
2663
/* Lower privileges */
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2667
perror_plus("Failed to lower privileges");
2668
}
2669
}
2670
}
2671
2672
/* Remove invalid interface names (except "none") */
2673
{
2674
char *interface = NULL;
2675
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2676
interface))){
2677
if(strcmp(interface, "none") != 0
2678
and if_nametoindex(interface) == 0){
2679
if(interface[0] != '\0'){
2680
fprintf_plus(stderr, "Not using nonexisting interface"
2681
" \"%s\"\n", interface);
2682
}
2683
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2684
interface = NULL;
2685
}
1735
2686
}
1736
2687
}
1737
2688
1738
2689
/* Run network hooks */
1739
2690
{
1740
if(getuid() == 0){
1741
/* Re-raise priviliges */
1742
errno = 0;
1743
ret = seteuid(0);
1744
if(ret == -1){
1745
perror_plus("seteuid");
1746
}
1747
}
1748
if(not run_network_hooks("start", interface, delay)){
1749
goto end;
1750
}
1751
if(getuid() == 0){
1752
/* Lower privileges */
1753
errno = 0;
1754
ret = seteuid(uid);
1755
if(ret == -1){
1756
perror_plus("seteuid");
1757
}
1758
}
2691
if(mc.interfaces != NULL){
2692
interfaces_hooks = malloc(mc.interfaces_size);
2693
if(interfaces_hooks == NULL){
2694
perror_plus("malloc");
2695
goto end;
2696
}
2697
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2699
}
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
1759
2702
}
1760
2703
1761
2704
if(not debug){
1762
2705
avahi_set_log_function(empty_log);
1763
2706
}
1764
2707
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1781
}
1782
if(interface == NULL){
1783
perror_plus("malloc");
1784
free(direntries);
1785
exitcode = EXIT_FAILURE;
1786
goto end;
1787
}
1788
free(direntries);
1789
} else {
1790
free(direntries);
1791
fprintf_plus(stderr, "Could not find a network interface\n");
1792
exitcode = EXIT_FAILURE;
1793
goto end;
1794
}
1795
}
1796
1797
2708
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1798
2709
from the signal handler */
1799
2710
/* Initialize the pseudo-RNG for Avahi */
1800
2711
srand((unsigned int) time(NULL));
1801
mc.simple_poll = avahi_simple_poll_new();
1802
if(mc.simple_poll == NULL){
2712
simple_poll = avahi_simple_poll_new();
2713
if(simple_poll == NULL){
1803
2714
fprintf_plus(stderr,
1804
2715
"Avahi: Failed to create simple poll object.\n");
1805
2716
exitcode = EX_UNAVAILABLE;
1869
2780
}
1870
2781
}
1871
2782
1872
/* If the interface is down, bring it up */
1873
if(strcmp(interface, "none") != 0){
1874
if_index = (AvahiIfIndex) if_nametoindex(interface);
1875
if(if_index == 0){
1876
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1877
exitcode = EX_UNAVAILABLE;
1878
goto end;
1879
}
1880
1881
if(quit_now){
1882
goto end;
1883
}
1884
1885
/* Re-raise priviliges */
1886
errno = 0;
1887
ret = seteuid(0);
1888
if(ret == -1){
1889
perror_plus("seteuid");
1890
}
1891
1892
#ifdef __linux__
1893
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1894
messages about the network interface to mess up the prompt */
1895
ret = klogctl(8, NULL, 5);
1896
bool restore_loglevel = true;
1897
if(ret == -1){
1898
restore_loglevel = false;
1899
perror_plus("klogctl");
1900
}
1901
#endif /* __linux__ */
1902
1903
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1904
if(sd < 0){
1905
perror_plus("socket");
1906
exitcode = EX_OSERR;
1907
#ifdef __linux__
1908
if(restore_loglevel){
1909
ret = klogctl(7, NULL, 0);
1910
if(ret == -1){
1911
perror_plus("klogctl");
1912
}
1913
}
1914
#endif /* __linux__ */
1915
/* Lower privileges */
1916
errno = 0;
1917
ret = seteuid(uid);
1918
if(ret == -1){
1919
perror_plus("seteuid");
1920
}
1921
goto end;
1922
}
1923
strcpy(network.ifr_name, interface);
1924
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1925
if(ret == -1){
1926
perror_plus("ioctl SIOCGIFFLAGS");
1927
#ifdef __linux__
1928
if(restore_loglevel){
1929
ret = klogctl(7, NULL, 0);
1930
if(ret == -1){
1931
perror_plus("klogctl");
1932
}
1933
}
1934
#endif /* __linux__ */
1935
exitcode = EX_OSERR;
1936
/* Lower privileges */
1937
errno = 0;
1938
ret = seteuid(uid);
1939
if(ret == -1){
1940
perror_plus("seteuid");
1941
}
1942
goto end;
1943
}
1944
if((network.ifr_flags & IFF_UP) == 0){
1945
network.ifr_flags |= IFF_UP;
1946
take_down_interface = true;
1947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1948
if(ret == -1){
1949
take_down_interface = false;
1950
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1951
exitcode = EX_OSERR;
1952
#ifdef __linux__
1953
if(restore_loglevel){
1954
ret = klogctl(7, NULL, 0);
1955
if(ret == -1){
1956
perror_plus("klogctl");
2783
/* If no interfaces were specified, make a list */
2784
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2786
/* Look for any good interfaces */
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2788
alphasort);
2789
if(ret >= 1){
2790
/* Add all found interfaces to interfaces list */
2791
for(int i = 0; i < ret; ++i){
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2793
direntries[i]->d_name);
2794
if(ret_errno != 0){
2795
errno = ret_errno;
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2798
continue;
2799
}
2800
if(debug){
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
direntries[i]->d_name);
2803
}
2804
free(direntries[i]);
2805
}
2806
free(direntries);
2807
} else {
2808
if(ret == 0){
2809
free(direntries);
2810
}
2811
fprintf_plus(stderr, "Could not find a network interface\n");
2812
exitcode = EXIT_FAILURE;
2813
goto end;
2814
}
2815
}
2816
2817
/* Bring up interfaces which are down, and remove any "none"s */
2818
{
2819
char *interface = NULL;
2820
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2821
interface))){
2822
/* If interface name is "none", stop bringing up interfaces.
2823
Also remove all instances of "none" from the list */
2824
if(strcmp(interface, "none") == 0){
2825
argz_delete(&mc.interfaces, &mc.interfaces_size,
2826
interface);
2827
interface = NULL;
2828
while((interface = argz_next(mc.interfaces,
2829
mc.interfaces_size, interface))){
2830
if(strcmp(interface, "none") == 0){
2831
argz_delete(&mc.interfaces, &mc.interfaces_size,
2832
interface);
2833
interface = NULL;
1957
2834
}
1958
2835
}
1959
#endif /* __linux__ */
1960
/* Lower privileges */
1961
errno = 0;
1962
ret = seteuid(uid);
1963
if(ret == -1){
1964
perror_plus("seteuid");
1965
}
1966
goto end;
1967
}
1968
}
1969
/* Sleep checking until interface is running.
1970
Check every 0.25s, up to total time of delay */
1971
for(int i=0; i < delay * 4; i++){
1972
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1973
if(ret == -1){
1974
perror_plus("ioctl SIOCGIFFLAGS");
1975
} else if(network.ifr_flags & IFF_RUNNING){
1976
2836
break;
1977
2837
}
1978
struct timespec sleeptime = { .tv_nsec = 250000000 };
1979
ret = nanosleep(&sleeptime, NULL);
1980
if(ret == -1 and errno != EINTR){
1981
perror_plus("nanosleep");
1982
}
1983
}
1984
if(not take_down_interface){
1985
/* We won't need the socket anymore */
1986
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1987
if(ret == -1){
1988
perror_plus("close");
1989
}
1990
}
1991
#ifdef __linux__
1992
if(restore_loglevel){
1993
/* Restores kernel loglevel to default */
1994
ret = klogctl(7, NULL, 0);
1995
if(ret == -1){
1996
perror_plus("klogctl");
1997
}
1998
}
1999
#endif /* __linux__ */
2000
/* Lower privileges */
2001
errno = 0;
2002
/* Lower privileges */
2003
ret = seteuid(uid);
2004
if(ret == -1){
2005
perror_plus("seteuid");
2006
}
2838
bool interface_was_up = interface_is_up(interface);
2839
errno = bring_up_interface(interface, delay);
2840
if(not interface_was_up){
2841
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2844
} else {
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
}
2851
}
2852
}
2853
}
2854
if(debug and (interfaces_to_take_down == NULL)){
2855
fprintf_plus(stderr, "No interfaces were brought up\n");
2856
}
2857
}
2858
2859
/* If we only got one interface, explicitly use only that one */
2860
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2861
if(debug){
2862
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2863
mc.interfaces);
2864
}
2865
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2007
2866
}
2008
2867
2009
2868
if(quit_now){
2010
2869
goto end;
2011
2870
}
2012
2871
2013
ret = init_gnutls_global(pubkey, seckey);
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2014
2873
if(ret == -1){
2015
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2016
2875
exitcode = EX_UNAVAILABLE;
2023
2882
goto end;
2024
2883
}
2025
2884
2026
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){
2027
2895
perror_plus("mkdtemp");
2028
2896
goto end;
2029
2897
}
2030
tempdir_created = true;
2031
2898
2032
2899
if(quit_now){
2033
2900
goto end;
2034
2901
}
2035
2902
2036
if(not init_gpgme(pubkey, seckey, tempdir)){
2903
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2037
2904
fprintf_plus(stderr, "init_gpgme failed\n");
2038
2905
exitcode = EX_UNAVAILABLE;
2039
2906
goto end;
2049
2916
/* Connect directly, do not use Zeroconf */
2050
2917
/* (Mainly meant for debugging) */
2051
2918
char *address = strrchr(connect_to, ':');
2919
2052
2920
if(address == NULL){
2053
2921
fprintf_plus(stderr, "No colon in address\n");
2054
2922
exitcode = EX_USAGE;
2059
2927
goto end;
2060
2928
}
2061
2929
2062
uint16_t port;
2930
in_port_t port;
2063
2931
errno = 0;
2064
2932
tmpmax = strtoimax(address+1, &tmp, 10);
2065
2933
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2066
or tmpmax != (uint16_t)tmpmax){
2934
or tmpmax != (in_port_t)tmpmax){
2067
2935
fprintf_plus(stderr, "Bad port number\n");
2068
2936
exitcode = EX_USAGE;
2069
2937
goto end;
2070
2938
}
2071
2939
2072
2940
if(quit_now){
2073
2941
goto end;
2074
2942
}
2075
2943
2076
port = (uint16_t)tmpmax;
2944
port = (in_port_t)tmpmax;
2077
2945
*address = '\0';
2078
2946
/* Colon in address indicates IPv6 */
2079
2947
int af;
2095
2963
}
2096
2964
2097
2965
while(not quit_now){
2098
ret = start_mandos_communication(address, port, if_index, af);
2966
ret = start_mandos_communication(address, port, if_index, af,
2967
&mc);
2099
2968
if(quit_now or ret == 0){
2100
2969
break;
2101
2970
}
2103
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2104
2973
(int)retry_interval);
2105
2974
}
2106
sleep((int)retry_interval);
2975
sleep((unsigned int)retry_interval);
2107
2976
}
2108
2977
2109
if (not quit_now){
2978
if(not quit_now){
2110
2979
exitcode = EXIT_SUCCESS;
2111
2980
}
2112
2981
2127
2996
config.publish_domain = 0;
2128
2997
2129
2998
/* Allocate a new server */
2130
mc.server = avahi_server_new(avahi_simple_poll_get
2131
(mc.simple_poll), &config, NULL,
2132
NULL, &error);
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
2133
3001
2134
3002
/* Free the Avahi configuration data */
2135
3003
avahi_server_config_free(&config);
2138
3006
/* Check if creating the Avahi server object succeeded */
2139
3007
if(mc.server == NULL){
2140
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2141
avahi_strerror(error));
3009
avahi_strerror(ret));
2142
3010
exitcode = EX_UNAVAILABLE;
2143
3011
goto end;
2144
3012
}
2150
3018
/* Create the Avahi service browser */
2151
3019
sb = avahi_s_service_browser_new(mc.server, if_index,
2152
3020
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2153
NULL, 0, browse_callback, NULL);
3021
NULL, 0, browse_callback,
3022
(void *)&mc);
2154
3023
if(sb == NULL){
2155
3024
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2156
3025
avahi_strerror(avahi_server_errno(mc.server)));
2167
3036
if(debug){
2168
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
2169
3038
}
2170
2171
ret = avahi_loop_with_timeout(mc.simple_poll,
2172
(int)(retry_interval * 1000));
3039
3040
ret = avahi_loop_with_timeout(simple_poll,
3041
(int)(retry_interval * 1000), &mc);
2173
3042
if(debug){
2174
3043
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2175
3044
(ret == 0) ? "successfully" : "with error");
2178
3047
end:
2179
3048
2180
3049
if(debug){
2181
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
}
2182
3057
}
2183
3058
2184
3059
/* Cleanup things */
3060
free(mc.interfaces);
3061
2185
3062
if(sb != NULL)
2186
3063
avahi_s_service_browser_free(sb);
2187
3064
2188
3065
if(mc.server != NULL)
2189
3066
avahi_server_free(mc.server);
2190
3067
2191
if(mc.simple_poll != NULL)
2192
avahi_simple_poll_free(mc.simple_poll);
3068
if(simple_poll != NULL)
3069
avahi_simple_poll_free(simple_poll);
2193
3070
2194
3071
if(gnutls_initialized){
2195
3072
gnutls_certificate_free_credentials(mc.cred);
2196
gnutls_global_deinit();
2197
3073
gnutls_dh_params_deinit(mc.dh_params);
2198
3074
}
2199
3075
2200
3076
if(gpgme_initialized){
2201
3077
gpgme_release(mc.ctx);
2202
3078
}
2203
3079
2204
3080
/* Cleans up the circular linked list of Mandos servers the client
2205
3081
has seen */
2206
3082
if(mc.current_server != NULL){
2207
3083
mc.current_server->prev->next = NULL;
2208
3084
while(mc.current_server != NULL){
2209
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
2210
3094
free(mc.current_server);
2211
3095
mc.current_server = next;
2212
3096
}
2213
3097
}
2214
3098
2215
/* Re-raise priviliges */
3099
/* Re-raise privileges */
2216
3100
{
2217
if(getuid() == 0){
2218
errno = 0;
2219
ret = seteuid(0);
2220
if(ret == -1){
2221
perror_plus("seteuid");
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
}
2222
3127
}
2223
3128
}
2224
/* Run network hooks */
2225
if(not run_network_hooks("stop", interface, delay)){
2226
goto end;
2227
}
2228
3129
2229
/* Take down the network interface */
2230
if(take_down_interface and geteuid() == 0){
2231
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2232
if(ret == -1){
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2237
if(ret == -1){
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2239
}
2240
}
2241
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2242
if(ret == -1){
2243
perror_plus("close");
2244
}
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
3133
perror_plus("Failed to lower privileges permanently");
2245
3134
}
2246
3135
}
2247
if(getuid() == 0){
2248
/* Lower privileges permanently */
2249
errno = 0;
2250
ret = setuid(uid);
2251
if(ret == -1){
2252
perror_plus("setuid");
2253
}
3136
3137
free(interfaces_to_take_down);
3138
free(interfaces_hooks);
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);
2254
3192
}
2255
3193
2256
3194
/* Removes the GPGME temp directory and all files inside */
2257
if(tempdir_created){
2258
struct dirent **direntries = NULL;
2259
struct dirent *direntry = NULL;
2260
int numentries = scandir(tempdir, &direntries, notdotentries,
2261
alphasort);
2262
if (numentries > 0){
2263
for(int i = 0; i < numentries; i++){
2264
direntry = direntries[i];
2265
char *fullname = NULL;
2266
ret = asprintf(&fullname, "%s/%s", tempdir,
2267
direntry->d_name);
2268
if(ret < 0){
2269
perror_plus("asprintf");
2270
continue;
2271
}
2272
ret = remove(fullname);
2273
if(ret == -1){
2274
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2275
strerror(errno));
2276
}
2277
free(fullname);
2278
}
2279
}
2280
2281
/* need to clean even if 0 because man page doesn't specify */
2282
free(direntries);
2283
if (numentries == -1){
2284
perror_plus("scandir");
2285
}
2286
ret = rmdir(tempdir);
2287
if(ret == -1 and errno != ENOENT){
2288
perror_plus("rmdir");
2289
}
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
2290
3197
}
2291
3198
2292
3199
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0