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- Committer: Teddy Hogeborn
- Date: 2011-04-03 00:46:51 UTC
- Revision ID: teddy@fukt.bsnet.se-20110403004651-yyrzgwwkoq4ts2vi
* mandos: Never call .Reset() on a defunct Avahi entry group.
(AvahiService.remove): Only do group.Reset(), as before.
(AvahiService.add): Only create new group if necessary.
(AvahiService.cleanup): Also do group.Free() if a group exists.
(AvahiService.server_state_changed): Call .cleanup() on errors.
Also log error parameter, if
passed.
(AvahiService.remove): Only do group.Reset(), as before.
(AvahiService.add): Only create new group if necessary.
(AvahiService.cleanup): Also do group.Free() if a group exists.
(AvahiService.server_state_changed): Call .cleanup() on errors.
Also log error parameter, if
passed.
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- 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 © 2008-2018 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
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
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
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
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() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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,
72
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
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() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
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,
92
84
raise() */
93
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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() */
104
87
105
88
#ifdef __linux__
106
89
#include <sys/klog.h> /* klogctl() */
124
107
init_gnutls_session(),
125
108
GNUTLS_* */
126
109
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
129
112
130
113
/* GPGME */
131
114
#include <gpgme.h> /* All GPGME types, constants and
139
122
#define PATHDIR "/conf/conf.d/mandos"
140
123
#define SECKEY "seckey.txt"
141
124
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
125
144
126
bool debug = false;
145
127
static const char mandos_protocol_version[] = "1";
146
128
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
130
static const char sys_class_net[] = "/sys/class/net";
149
131
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
165
132
166
133
/* Used for passing in values through the Avahi callback functions */
167
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
168
136
AvahiServer *server;
169
137
gnutls_certificate_credentials_t cred;
170
138
unsigned int dh_bits;
171
139
gnutls_dh_params_t dh_params;
172
140
const char *priority;
173
141
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
142
} mandos_context;
178
143
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
181
148
182
149
sig_atomic_t quit_now = 0;
183
150
int signal_received = 0;
184
151
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
204
152
/*
205
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
154
* bytes. "buffer_capacity" is how much is currently allocated,
207
155
* "buffer_length" is how much is already used.
208
156
*/
209
__attribute__((nonnull, warn_unused_result))
210
157
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
158
size_t buffer_capacity){
212
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
219
162
return 0;
220
163
}
221
*buffer = new_buf;
222
164
buffer_capacity += BUFFER_SIZE;
223
165
}
224
166
return buffer_capacity;
225
167
}
226
168
227
/* Add server to set of servers to retry periodically */
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){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
169
/*
276
170
* Initialize GPGME.
277
171
*/
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){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
283
174
gpgme_error_t rc;
284
175
gpgme_engine_info_t engine_info;
285
176
177
286
178
/*
287
179
* Helper function to insert pub and seckey to the engine keyring.
288
180
*/
289
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
290
182
int ret;
291
183
int fd;
292
184
gpgme_data_t pgp_data;
293
185
294
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
295
187
if(fd == -1){
296
perror_plus("open");
188
perror("open");
297
189
return false;
298
190
}
299
191
300
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
193
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
304
196
return false;
305
197
}
306
198
307
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
308
200
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
311
203
return false;
312
204
}
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
}
388
205
389
ret = close(fd);
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
207
if(ret == -1){
391
perror_plus("close");
208
perror("close");
392
209
}
393
210
gpgme_data_release(pgp_data);
394
211
return true;
395
212
}
396
213
397
214
if(debug){
398
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
399
216
}
400
217
401
218
/* Init GPGME */
402
219
gpgme_check_version(NULL);
403
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
404
221
if(rc != GPG_ERR_NO_ERROR){
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
407
224
return false;
408
225
}
409
226
410
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
411
228
rc = gpgme_get_engine_info(&engine_info);
412
229
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
415
232
return false;
416
233
}
417
234
while(engine_info != NULL){
423
240
engine_info = engine_info->next;
424
241
}
425
242
if(engine_info == NULL){
426
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
427
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
428
244
return false;
429
245
}
430
246
431
247
/* Create new GPGME "context" */
432
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
433
249
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
436
252
return false;
437
253
}
438
254
447
263
* Decrypt OpenPGP data.
448
264
* Returns -1 on error
449
265
*/
450
__attribute__((nonnull, warn_unused_result))
451
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
452
267
size_t crypto_size,
453
char **plaintext,
454
mandos_context *mc){
268
char **plaintext){
455
269
gpgme_data_t dh_crypto, dh_plain;
456
270
gpgme_error_t rc;
457
271
ssize_t ret;
459
273
ssize_t plaintext_length = 0;
460
274
461
275
if(debug){
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
463
277
}
464
278
465
279
/* Create new GPGME data buffer from memory cryptotext */
466
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
467
281
0);
468
282
if(rc != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
470
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
471
285
return -1;
472
286
}
473
287
474
288
/* Create new empty GPGME data buffer for the plaintext */
475
289
rc = gpgme_data_new(&dh_plain);
476
290
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
479
293
gpgme_data_release(dh_crypto);
480
294
return -1;
481
295
}
482
296
483
297
/* Decrypt data from the cryptotext data buffer to the plaintext
484
298
data buffer */
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
486
300
if(rc != GPG_ERR_NO_ERROR){
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
489
303
plaintext_length = -1;
490
304
if(debug){
491
305
gpgme_decrypt_result_t result;
492
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
493
307
if(result == NULL){
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
495
309
} else {
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");
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
502
314
if(result->file_name != NULL){
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
504
316
}
505
317
gpgme_recipient_t recipient;
506
318
recipient = result->recipients;
507
319
while(recipient != NULL){
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name
510
(recipient->pubkey_algo));
511
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
512
fprintf_plus(stderr, "Secret key available: %s\n",
513
recipient->status == GPG_ERR_NO_SECKEY
514
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
515
326
recipient = recipient->next;
516
327
}
517
328
}
520
331
}
521
332
522
333
if(debug){
523
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
524
335
}
525
336
526
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
527
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
528
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
529
340
plaintext_length = -1;
530
341
goto decrypt_end;
531
342
}
533
344
*plaintext = NULL;
534
345
while(true){
535
346
plaintext_capacity = incbuffer(plaintext,
536
(size_t)plaintext_length,
537
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
538
349
if(plaintext_capacity == 0){
539
perror_plus("incbuffer");
540
plaintext_length = -1;
541
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
542
353
}
543
354
544
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
549
360
break;
550
361
}
551
362
if(ret < 0){
552
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
553
364
plaintext_length = -1;
554
365
goto decrypt_end;
555
366
}
557
368
}
558
369
559
370
if(debug){
560
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
561
372
for(ssize_t i = 0; i < plaintext_length; i++){
562
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
563
374
}
574
385
return plaintext_length;
575
386
}
576
387
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
return ret;
588
394
}
589
395
590
396
/* GnuTLS log function callback */
591
__attribute__((nonnull))
592
397
static void debuggnutls(__attribute__((unused)) int level,
593
398
const char* string){
594
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
595
400
}
596
401
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
598
402
static int init_gnutls_global(const char *pubkeyfilename,
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
mandos_context *mc){
403
const char *seckeyfilename){
602
404
int ret;
603
unsigned int uret;
604
405
605
406
if(debug){
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
408
}
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
414
return -1;
607
415
}
608
416
609
417
if(debug){
615
423
}
616
424
617
425
/* OpenPGP credentials */
618
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
619
427
if(ret != GNUTLS_E_SUCCESS){
620
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
622
434
return -1;
623
435
}
624
436
625
437
if(debug){
626
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
627
" secret key %s as GnuTLS credentials\n",
628
pubkeyfilename,
629
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
630
441
}
631
442
632
443
ret = gnutls_certificate_set_openpgp_key_file
633
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
634
445
GNUTLS_OPENPGP_FMT_BASE64);
635
446
if(ret != GNUTLS_E_SUCCESS){
636
fprintf_plus(stderr,
637
"Error[%d] while reading the OpenPGP key pair ('%s',"
638
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
639
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
640
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
641
452
goto globalfail;
642
453
}
643
454
644
455
/* GnuTLS server initialization */
645
ret = gnutls_dh_params_init(&mc->dh_params);
646
if(ret != GNUTLS_E_SUCCESS){
647
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
648
" initialization: %s\n",
649
safer_gnutls_strerror(ret));
650
goto globalfail;
651
}
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
830
470
831
471
return 0;
832
472
833
473
globalfail:
834
474
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
837
478
return -1;
838
479
}
839
480
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
842
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
843
482
int ret;
844
483
/* GnuTLS session creation */
845
484
do {
849
488
}
850
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
851
490
if(ret != GNUTLS_E_SUCCESS){
852
fprintf_plus(stderr,
853
"Error in GnuTLS session initialization: %s\n",
854
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
855
493
}
856
494
857
495
{
858
496
const char *err;
859
497
do {
860
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
861
499
if(quit_now){
862
500
gnutls_deinit(*session);
863
501
return -1;
864
502
}
865
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
866
504
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Syntax error at: %s\n", err);
868
fprintf_plus(stderr, "GnuTLS error: %s\n",
869
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
870
508
gnutls_deinit(*session);
871
509
return -1;
872
510
}
874
512
875
513
do {
876
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
877
mc->cred);
515
mc.cred);
878
516
if(quit_now){
879
517
gnutls_deinit(*session);
880
518
return -1;
881
519
}
882
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
883
521
if(ret != GNUTLS_E_SUCCESS){
884
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
885
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
886
524
gnutls_deinit(*session);
887
525
return -1;
888
526
}
890
528
/* ignore client certificate if any. */
891
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
530
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
893
533
return 0;
894
534
}
895
535
897
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
538
__attribute__((unused)) const char *txt){}
899
539
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
1118
540
/* Called when a Mandos server is found */
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
1121
542
AvahiIfIndex if_index,
1122
int af, mandos_context *mc){
543
int af){
1123
544
int ret, tcp_sd = -1;
1124
545
ssize_t sret;
1125
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
1126
550
char *buffer = NULL;
1127
551
char *decrypted_buffer = NULL;
1128
552
size_t buffer_length = 0;
1131
555
int retval = -1;
1132
556
gnutls_session_t session;
1133
557
int pf; /* Protocol family */
1134
bool route_added = false;
1135
558
1136
559
errno = 0;
1137
560
1148
571
pf = PF_INET;
1149
572
break;
1150
573
default:
1151
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
1152
575
errno = EINVAL;
1153
576
return -1;
1154
577
}
1155
578
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1159
bool match = false;
1160
{
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
match = true;
1167
break;
1168
}
1169
}
1170
}
1171
if(not match){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1174
if(debug){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1180
" \"%s\"\n",
1181
if_indextoname((unsigned int)if_index,
1182
interface));
1183
}
1184
}
1185
return -1;
1186
}
1187
}
1188
1189
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
1190
580
if(ret != 0){
1191
581
return -1;
1192
582
}
1193
583
1194
584
if(debug){
1195
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1196
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1197
587
}
1198
588
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
590
if(tcp_sd < 0){
1201
591
int e = errno;
1202
perror_plus("socket");
592
perror("socket");
1203
593
errno = e;
1204
594
goto mandos_end;
1205
595
}
1209
599
goto mandos_end;
1210
600
}
1211
601
602
memset(&to, 0, sizeof(to));
1212
603
if(af == AF_INET6){
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1216
606
} else { /* IPv4 */
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1220
609
}
1221
610
if(ret < 0 ){
1222
611
int e = errno;
1223
perror_plus("inet_pton");
612
perror("inet_pton");
1224
613
errno = e;
1225
614
goto mandos_end;
1226
615
}
1227
616
if(ret == 0){
1228
617
int e = errno;
1229
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
1230
619
errno = e;
1231
620
goto mandos_end;
1232
621
}
1233
622
if(af == AF_INET6){
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
1237
630
if(if_index == AVAHI_IF_UNSPEC){
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
1239
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1240
633
errno = EINVAL;
1241
634
goto mandos_end;
1242
635
}
1243
636
/* Set the network interface number as scope */
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1245
638
}
1246
639
} else {
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1248
643
}
1249
644
1250
645
if(quit_now){
1256
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1257
652
char interface[IF_NAMESIZE];
1258
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1259
perror_plus("if_indextoname");
654
perror("if_indextoname");
1260
655
} else {
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1263
658
}
1264
659
} else {
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1267
662
}
1268
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1269
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
1350
704
}
1351
705
1352
706
const char *out = mandos_protocol_version;
1354
708
while(true){
1355
709
size_t out_size = strlen(out);
1356
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1357
out_size - written));
711
out_size - written));
1358
712
if(ret == -1){
1359
713
int e = errno;
1360
perror_plus("write");
714
perror("write");
1361
715
errno = e;
1362
716
goto mandos_end;
1363
717
}
1380
734
}
1381
735
1382
736
if(debug){
1383
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1384
738
}
1385
739
1386
740
if(quit_now){
1388
742
goto mandos_end;
1389
743
}
1390
744
1391
/* This casting via intptr_t is to eliminate warning about casting
1392
an int to a pointer type. This is exactly how the GnuTLS Guile
1393
function "set-session-transport-fd!" does it. */
1394
gnutls_transport_set_ptr(session,
1395
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1396
746
1397
747
if(quit_now){
1398
748
errno = EINTR;
1409
759
1410
760
if(ret != GNUTLS_E_SUCCESS){
1411
761
if(debug){
1412
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1413
763
gnutls_perror(ret);
1414
764
}
1415
765
errno = EPROTO;
1419
769
/* Read OpenPGP packet that contains the wanted password */
1420
770
1421
771
if(debug){
1422
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1423
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
1424
774
}
1425
775
1426
776
while(true){
1431
781
}
1432
782
1433
783
buffer_capacity = incbuffer(&buffer, buffer_length,
1434
buffer_capacity);
784
buffer_capacity);
1435
785
if(buffer_capacity == 0){
1436
786
int e = errno;
1437
perror_plus("incbuffer");
787
perror("incbuffer");
1438
788
errno = e;
1439
789
goto mandos_end;
1440
790
}
1464
814
}
1465
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1466
816
if(ret < 0){
1467
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1468
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1469
818
gnutls_perror(ret);
1470
819
errno = EPROTO;
1471
820
goto mandos_end;
1472
821
}
1473
822
break;
1474
823
default:
1475
fprintf_plus(stderr, "Unknown error while reading data from"
1476
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
1477
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1478
827
errno = EIO;
1479
828
goto mandos_end;
1484
833
}
1485
834
1486
835
if(debug){
1487
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
1488
837
}
1489
838
1490
839
if(quit_now){
1502
851
1503
852
if(buffer_length > 0){
1504
853
ssize_t decrypted_buffer_size;
1505
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1506
&decrypted_buffer, mc);
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1507
857
if(decrypted_buffer_size >= 0){
1508
858
1509
clearerr(stdout);
1510
859
written = 0;
1511
860
while(written < (size_t) decrypted_buffer_size){
1512
861
if(quit_now){
1520
869
if(ret == 0 and ferror(stdout)){
1521
870
int e = errno;
1522
871
if(debug){
1523
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1524
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1525
874
}
1526
875
errno = e;
1527
876
goto mandos_end;
1528
877
}
1529
878
written += (size_t)ret;
1530
879
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
1541
880
retval = 0;
1542
881
}
1543
882
}
1546
885
1547
886
mandos_end:
1548
887
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1555
888
int e = errno;
1556
889
free(decrypted_buffer);
1557
890
free(buffer);
1558
891
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
893
}
1561
894
if(ret == -1){
1562
895
if(e == 0){
1563
896
e = errno;
1564
897
}
1565
perror_plus("close");
898
perror("close");
1566
899
}
1567
900
gnutls_deinit(session);
1568
errno = e;
1569
901
if(quit_now){
1570
errno = EINTR;
902
e = EINTR;
1571
903
retval = -1;
1572
904
}
905
errno = e;
1573
906
}
1574
907
return retval;
1575
908
}
1587
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
1588
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1589
922
flags,
1590
void *mc){
1591
if(r == NULL){
1592
return;
1593
}
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1594
925
1595
926
/* Called whenever a service has been resolved successfully or
1596
927
timed out */
1597
928
1598
929
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
930
return;
1601
931
}
1602
932
1603
933
switch(event){
1604
934
default:
1605
935
case AVAHI_RESOLVER_FAILURE:
1606
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1607
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1608
domain,
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1611
939
break;
1612
940
1613
941
case AVAHI_RESOLVER_FOUND:
1615
943
char ip[AVAHI_ADDRESS_STR_MAX];
1616
944
avahi_address_snprint(ip, sizeof(ip), address);
1617
945
if(debug){
1618
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1619
PRIdMAX ") on port %" PRIu16 "\n", name,
1620
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1621
949
}
1622
int ret = start_mandos_communication(ip, (in_port_t)port,
1623
interface,
1624
avahi_proto_to_af(proto),
1625
mc);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1626
952
if(ret == 0){
1627
avahi_simple_poll_quit(simple_poll);
1628
} else {
1629
if(not add_server(ip, (in_port_t)port, interface,
1630
avahi_proto_to_af(proto),
1631
&((mandos_context*)mc)->current_server)){
1632
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1633
" list\n", name);
1634
}
953
avahi_simple_poll_quit(mc.simple_poll);
1635
954
}
1636
955
}
1637
956
}
1647
966
const char *domain,
1648
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1649
968
flags,
1650
void *mc){
1651
if(b == NULL){
1652
return;
1653
}
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1654
971
1655
972
/* Called whenever a new services becomes available on the LAN or
1656
973
is removed from the LAN */
1663
980
default:
1664
981
case AVAHI_BROWSER_FAILURE:
1665
982
1666
fprintf_plus(stderr, "(Avahi browser) %s\n",
1667
avahi_strerror(avahi_server_errno
1668
(((mandos_context*)mc)->server)));
1669
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1670
986
return;
1671
987
1672
988
case AVAHI_BROWSER_NEW:
1675
991
the callback function is called the Avahi server will free the
1676
992
resolver for us. */
1677
993
1678
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1679
interface, protocol, name, type,
1680
domain, protocol, 0,
1681
resolve_callback, mc) == NULL)
1682
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1683
" %s\n", name,
1684
avahi_strerror(avahi_server_errno
1685
(((mandos_context*)mc)->server)));
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1686
999
break;
1687
1000
1688
1001
case AVAHI_BROWSER_REMOVE:
1691
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1692
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1693
1006
if(debug){
1694
fprintf_plus(stderr, "No Mandos server found, still"
1695
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1696
1008
}
1697
1009
break;
1698
1010
}
1699
1011
}
1700
1012
1701
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1702
1014
static void handle_sigterm(int sig){
1703
1015
if(quit_now){
1704
1016
return;
1706
1018
quit_now = 1;
1707
1019
signal_received = sig;
1708
1020
int old_errno = errno;
1709
/* set main loop to exit */
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1712
1023
}
1713
1024
errno = old_errno;
1714
1025
}
1715
1026
1716
__attribute__((nonnull, warn_unused_result))
1717
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
int ret;
1719
int old_errno;
1720
1721
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
if(s < 0){
1723
old_errno = errno;
1724
perror_plus("socket");
1725
errno = old_errno;
1726
return false;
1727
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1730
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
if(ret == -1){
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1732
1083
if(debug){
1733
old_errno = errno;
1734
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1741
}
1742
return false;
1743
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
return true;
1750
}
1751
1752
__attribute__((nonnull, warn_unused_result))
1753
bool good_flags(const char *ifname, const struct ifreq *ifr){
1754
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1755
1092
/* Reject the loopback device */
1756
if(ifr->ifr_flags & IFF_LOOPBACK){
1093
if(flags & IFF_LOOPBACK){
1757
1094
if(debug){
1758
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1759
ifname);
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1760
1097
}
1761
return false;
1098
return 0;
1762
1099
}
1763
1100
/* Accept point-to-point devices only if connect_to is specified */
1764
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1765
1102
if(debug){
1766
fprintf_plus(stderr, "Accepting point-to-point interface"
1767
" \"%s\"\n", ifname);
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1768
1105
}
1769
return true;
1106
return 1;
1770
1107
}
1771
1108
/* Otherwise, reject non-broadcast-capable devices */
1772
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1109
if(not (flags & IFF_BROADCAST)){
1773
1110
if(debug){
1774
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1775
" \"%s\"\n", ifname);
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1776
1113
}
1777
return false;
1114
return 0;
1778
1115
}
1779
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1780
if(ifr->ifr_flags & IFF_NOARP){
1117
if(flags & IFF_NOARP){
1781
1118
if(debug){
1782
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1783
ifname);
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
if_entry->d_name);
1784
1121
}
1785
return false;
1122
return 0;
1786
1123
}
1787
1788
1124
/* Accept this device */
1789
1125
if(debug){
1790
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1791
}
1792
return true;
1793
}
1794
1795
/*
1796
* This function determines if a directory entry in /sys/class/net
1797
* corresponds to an acceptable network device.
1798
* (This function is passed to scandir(3) as a filter function.)
1799
*/
1800
__attribute__((nonnull, warn_unused_result))
1801
int good_interface(const struct dirent *if_entry){
1802
if(if_entry->d_name[0] == '.'){
1803
return 0;
1804
}
1805
1806
struct ifreq ifr;
1807
if(not get_flags(if_entry->d_name, &ifr)){
1808
if(debug){
1809
fprintf_plus(stderr, "Failed to get flags for interface "
1810
"\"%s\"\n", if_entry->d_name);
1811
}
1812
return 0;
1813
}
1814
1815
if(not good_flags(if_entry->d_name, &ifr)){
1816
return 0;
1817
}
1818
return 1;
1819
}
1820
1821
/*
1822
* This function determines if a network interface is up.
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1826
struct ifreq ifr;
1827
if(not get_flags(interface, &ifr)){
1828
if(debug){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
}
1832
return false;
1833
}
1834
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1836
}
1837
1838
/*
1839
* This function determines if a network interface is running
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1843
struct ifreq ifr;
1844
if(not get_flags(interface, &ifr)){
1845
if(debug){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1848
}
1849
return false;
1850
}
1851
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1853
}
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1856
int notdotentries(const struct dirent *direntry){
1857
/* Skip "." and ".." */
1858
if(direntry->d_name[0] == '.'
1859
and (direntry->d_name[1] == '\0'
1860
or (direntry->d_name[1] == '.'
1861
and direntry->d_name[2] == '\0'))){
1862
return 0;
1863
}
1864
return 1;
1865
}
1866
1867
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1869
int runnable_hook(const struct dirent *direntry){
1870
int ret;
1871
size_t sret;
1872
struct stat st;
1873
1874
if((direntry->d_name)[0] == '\0'){
1875
/* Empty name? */
1876
return 0;
1877
}
1878
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
"abcdefghijklmnopqrstuvwxyz"
1881
"0123456789"
1882
"_.-");
1883
if((direntry->d_name)[sret] != '\0'){
1884
/* Contains non-allowed characters */
1885
if(debug){
1886
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1887
direntry->d_name);
1888
}
1889
return 0;
1890
}
1891
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1893
if(ret == -1){
1894
if(debug){
1895
perror_plus("Could not stat hook");
1896
}
1897
return 0;
1898
}
1899
if(not (S_ISREG(st.st_mode))){
1900
/* Not a regular file */
1901
if(debug){
1902
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1903
direntry->d_name);
1904
}
1905
return 0;
1906
}
1907
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1908
/* Not executable */
1909
if(debug){
1910
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1911
direntry->d_name);
1912
}
1913
return 0;
1914
}
1915
if(debug){
1916
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1917
direntry->d_name);
1918
}
1919
return 1;
1920
}
1921
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1925
int ret;
1926
struct timespec now;
1927
struct timespec waited_time;
1928
intmax_t block_time;
1929
1930
while(true){
1931
if(mc->current_server == NULL){
1932
if(debug){
1933
fprintf_plus(stderr, "Wait until first server is found."
1934
" No timeout!\n");
1935
}
1936
ret = avahi_simple_poll_iterate(s, -1);
1937
} else {
1938
if(debug){
1939
fprintf_plus(stderr, "Check current_server if we should run"
1940
" it, or wait\n");
1941
}
1942
/* the current time */
1943
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1944
if(ret == -1){
1945
perror_plus("clock_gettime");
1946
return -1;
1947
}
1948
/* Calculating in ms how long time between now and server
1949
who we visted longest time ago. Now - last seen. */
1950
waited_time.tv_sec = (now.tv_sec
1951
- mc->current_server->last_seen.tv_sec);
1952
waited_time.tv_nsec = (now.tv_nsec
1953
- mc->current_server->last_seen.tv_nsec);
1954
/* total time is 10s/10,000ms.
1955
Converting to s from ms by dividing by 1,000,
1956
and ns to ms by dividing by 1,000,000. */
1957
block_time = ((retry_interval
1958
- ((intmax_t)waited_time.tv_sec * 1000))
1959
- ((intmax_t)waited_time.tv_nsec / 1000000));
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1963
block_time);
1964
}
1965
1966
if(block_time <= 0){
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1971
if(ret == 0){
1972
avahi_simple_poll_quit(s);
1973
return 0;
1974
}
1975
ret = clock_gettime(CLOCK_MONOTONIC,
1976
&mc->current_server->last_seen);
1977
if(ret == -1){
1978
perror_plus("clock_gettime");
1979
return -1;
1980
}
1981
mc->current_server = mc->current_server->next;
1982
block_time = 0; /* Call avahi to find new Mandos
1983
servers, but don't block */
1984
}
1985
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1987
}
1988
if(ret != 0){
1989
if(ret > 0 or errno != EINTR){
1990
return (ret != 1) ? ret : 0;
1991
}
1992
}
1993
}
1994
}
1995
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1998
const float delay){
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2022
if(numhooks == -1){
2023
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
2034
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
2081
perror_plus("asprintf");
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
2086
free(delaystring);
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
2155
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
2175
}
2176
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2184
if(if_index == 0){
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2186
errno = old_errno;
2187
return ENXIO;
2188
}
2189
2190
if(quit_now){
2191
errno = old_errno;
2192
return EINTR;
2193
}
2194
2195
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2199
ret_errno = errno;
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
2203
return ret_errno;
2204
}
2205
network.ifr_flags |= IFF_UP; /* set flag */
2206
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
2209
ret_errno = errno;
2210
perror_plus("socket");
2211
errno = old_errno;
2212
return ret_errno;
2213
}
2214
2215
if(quit_now){
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
2220
errno = old_errno;
2221
return EINTR;
2222
}
2223
2224
if(debug){
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
interface);
2227
}
2228
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
2235
2236
#ifdef __linux__
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
2248
}
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2252
#ifdef __linux__
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2257
}
2258
}
2259
#endif /* __linux__ */
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
interface);
2286
}
2287
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2292
break;
2293
}
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2298
}
2299
}
2300
2301
errno = old_errno;
2302
return 0;
2303
}
2304
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2310
if(if_index == 0){
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
errno = old_errno;
2313
return ENXIO;
2314
}
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2319
ret_errno = errno;
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
2323
return ret_errno;
2324
}
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2326
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
2329
ret_errno = errno;
2330
perror_plus("socket");
2331
errno = old_errno;
2332
return ret_errno;
2333
}
2334
2335
if(debug){
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
interface);
2338
}
2339
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
2359
2360
/* Close the socket */
2361
int ret = close(sd);
2362
if(ret == -1){
2363
perror_plus("close");
2364
}
2365
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2369
errno = old_errno;
2370
return ioctl_errno;
2371
}
2372
} else if(debug){
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2374
interface);
2375
}
2376
2377
errno = old_errno;
2378
return 0;
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1127
if_entry->d_name);
1128
}
1129
return 1;
2379
1130
}
2380
1131
2381
1132
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
2387
1133
AvahiSServiceBrowser *sb = NULL;
2388
error_t ret_errno;
1134
int error;
2389
1135
int ret;
2390
1136
intmax_t tmpmax;
2391
1137
char *tmp;
2392
1138
int exitcode = EXIT_SUCCESS;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1139
const char *interface = "";
1140
struct ifreq network;
1141
int sd = -1;
1142
bool take_down_interface = false;
1143
uid_t uid;
1144
gid_t gid;
1145
char tempdir[] = "/tmp/mandosXXXXXX";
1146
bool tempdir_created = false;
2398
1147
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1148
const char *seckey = PATHDIR "/" SECKEY;
2400
1149
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
2403
1150
2404
1151
bool gnutls_initialized = false;
2405
1152
bool gpgme_initialized = false;
2406
1153
float delay = 2.5f;
2407
double retry_interval = 10; /* 10s between trying a server and
2408
retrying the same server again */
2409
1154
2410
1155
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2411
1156
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2417
1162
errno = 0;
2418
1163
ret = setgid(gid);
2419
1164
if(ret == -1){
2420
perror_plus("setgid");
1165
perror("setgid");
2421
1166
}
2422
1167
2423
1168
/* Lower user privileges (temporarily) */
2424
1169
errno = 0;
2425
1170
ret = seteuid(uid);
2426
1171
if(ret == -1){
2427
perror_plus("seteuid");
1172
perror("seteuid");
2428
1173
}
2429
1174
2430
1175
if(quit_now){
2457
1202
.doc = "Bit length of the prime number used in the"
2458
1203
" Diffie-Hellman key exchange",
2459
1204
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
2465
1205
{ .name = "priority", .key = 130,
2466
1206
.arg = "STRING",
2467
1207
.doc = "GnuTLS priority string for the TLS handshake",
2470
1210
.arg = "SECONDS",
2471
1211
.doc = "Maximum delay to wait for interface startup",
2472
1212
.group = 2 },
2473
{ .name = "retry", .key = 132,
2474
.arg = "SECONDS",
2475
.doc = "Retry interval used when denied by the Mandos server",
2476
.group = 2 },
2477
{ .name = "network-hook-dir", .key = 133,
2478
.arg = "DIR",
2479
.doc = "Directory where network hooks are located",
2480
.group = 2 },
2481
1213
/*
2482
1214
* These reproduce what we would get without ARGP_NO_HELP
2483
1215
*/
2501
1233
connect_to = arg;
2502
1234
break;
2503
1235
case 'i': /* --interface */
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2505
arg, (int)',');
2506
if(ret_errno != 0){
2507
argp_error(state, "%s", strerror(ret_errno));
2508
}
1236
interface = arg;
2509
1237
break;
2510
1238
case 's': /* --seckey */
2511
1239
seckey = arg;
2522
1250
}
2523
1251
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
1252
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
1253
case 130: /* --priority */
2529
1254
mc.priority = arg;
2530
1255
break;
2534
1259
if(errno != 0 or tmp == arg or *tmp != '\0'){
2535
1260
argp_error(state, "Bad delay");
2536
1261
}
2537
case 132: /* --retry */
2538
errno = 0;
2539
retry_interval = strtod(arg, &tmp);
2540
if(errno != 0 or tmp == arg or *tmp != '\0'
2541
or (retry_interval * 1000) > INT_MAX
2542
or retry_interval < 0){
2543
argp_error(state, "Bad retry interval");
2544
}
2545
break;
2546
case 133: /* --network-hook-dir */
2547
hookdir = arg;
2548
1262
break;
2549
1263
/*
2550
1264
* These reproduce what we would get without ARGP_NO_HELP
2557
1271
argp_state_help(state, state->out_stream,
2558
1272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2559
1273
case 'V': /* --version */
2560
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1274
fprintf(state->out_stream, "%s\n", argp_program_version);
2561
1275
exit(argp_err_exit_status);
2562
1276
break;
2563
1277
default:
2570
1284
.args_doc = "",
2571
1285
.doc = "Mandos client -- Get and decrypt"
2572
1286
" passwords from a Mandos server" };
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
1287
ret = argp_parse(&argp, argc, argv,
1288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1289
switch(ret){
2576
1290
case 0:
2577
1291
break;
2578
1292
case ENOMEM:
2579
1293
default:
2580
errno = ret_errno;
2581
perror_plus("argp_parse");
1294
errno = ret;
1295
perror("argp_parse");
2582
1296
exitcode = EX_OSERR;
2583
1297
goto end;
2584
1298
case EINVAL:
2587
1301
}
2588
1302
}
2589
1303
2590
{
2591
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2593
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
2599
} else {
2600
struct stat st;
2601
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2603
int seckey_fd = open(seckey, O_RDONLY);
2604
if(seckey_fd == -1){
2605
perror_plus("open");
2606
} else {
2607
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2608
if(ret == -1){
2609
perror_plus("fstat");
2610
} else {
2611
if(S_ISREG(st.st_mode)
2612
and st.st_uid == 0 and st.st_gid == 0){
2613
ret = fchown(seckey_fd, uid, gid);
2614
if(ret == -1){
2615
perror_plus("fchown");
2616
}
2617
}
2618
}
2619
close(seckey_fd);
2620
}
2621
}
2622
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2625
if(pubkey_fd == -1){
2626
perror_plus("open");
2627
} else {
2628
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2629
if(ret == -1){
2630
perror_plus("fstat");
2631
} else {
2632
if(S_ISREG(st.st_mode)
2633
and st.st_uid == 0 and st.st_gid == 0){
2634
ret = fchown(pubkey_fd, uid, gid);
2635
if(ret == -1){
2636
perror_plus("fchown");
2637
}
2638
}
2639
}
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2666
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2672
}
2673
}
2674
2675
/* Remove invalid interface names (except "none") */
2676
{
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2679
interface))){
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2685
}
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2687
interface = NULL;
2688
}
2689
}
2690
}
2691
2692
/* Run network hooks */
2693
{
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
2698
goto end;
2699
}
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
2705
}
2706
2707
1304
if(not debug){
2708
1305
avahi_set_log_function(empty_log);
2709
1306
}
1307
1308
if(interface[0] == '\0'){
1309
struct dirent **direntries;
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1311
alphasort);
1312
if(ret >= 1){
1313
/* Pick the first good interface */
1314
interface = strdup(direntries[0]->d_name);
1315
if(debug){
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1317
}
1318
if(interface == NULL){
1319
perror("malloc");
1320
free(direntries);
1321
exitcode = EXIT_FAILURE;
1322
goto end;
1323
}
1324
free(direntries);
1325
} else {
1326
free(direntries);
1327
fprintf(stderr, "Could not find a network interface\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
}
1331
}
2710
1332
2711
1333
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2712
1334
from the signal handler */
2713
1335
/* Initialize the pseudo-RNG for Avahi */
2714
1336
srand((unsigned int) time(NULL));
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
2717
fprintf_plus(stderr,
2718
"Avahi: Failed to create simple poll object.\n");
1337
mc.simple_poll = avahi_simple_poll_new();
1338
if(mc.simple_poll == NULL){
1339
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2719
1340
exitcode = EX_UNAVAILABLE;
2720
1341
goto end;
2721
1342
}
2723
1344
sigemptyset(&sigterm_action.sa_mask);
2724
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2725
1346
if(ret == -1){
2726
perror_plus("sigaddset");
1347
perror("sigaddset");
2727
1348
exitcode = EX_OSERR;
2728
1349
goto end;
2729
1350
}
2730
1351
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2731
1352
if(ret == -1){
2732
perror_plus("sigaddset");
1353
perror("sigaddset");
2733
1354
exitcode = EX_OSERR;
2734
1355
goto end;
2735
1356
}
2736
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2737
1358
if(ret == -1){
2738
perror_plus("sigaddset");
1359
perror("sigaddset");
2739
1360
exitcode = EX_OSERR;
2740
1361
goto end;
2741
1362
}
2745
1366
*/
2746
1367
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2747
1368
if(ret == -1){
2748
perror_plus("sigaction");
1369
perror("sigaction");
2749
1370
return EX_OSERR;
2750
1371
}
2751
1372
if(old_sigterm_action.sa_handler != SIG_IGN){
2752
1373
ret = sigaction(SIGINT, &sigterm_action, NULL);
2753
1374
if(ret == -1){
2754
perror_plus("sigaction");
1375
perror("sigaction");
2755
1376
exitcode = EX_OSERR;
2756
1377
goto end;
2757
1378
}
2758
1379
}
2759
1380
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2760
1381
if(ret == -1){
2761
perror_plus("sigaction");
1382
perror("sigaction");
2762
1383
return EX_OSERR;
2763
1384
}
2764
1385
if(old_sigterm_action.sa_handler != SIG_IGN){
2765
1386
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2766
1387
if(ret == -1){
2767
perror_plus("sigaction");
1388
perror("sigaction");
2768
1389
exitcode = EX_OSERR;
2769
1390
goto end;
2770
1391
}
2771
1392
}
2772
1393
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2773
1394
if(ret == -1){
2774
perror_plus("sigaction");
1395
perror("sigaction");
2775
1396
return EX_OSERR;
2776
1397
}
2777
1398
if(old_sigterm_action.sa_handler != SIG_IGN){
2778
1399
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2779
1400
if(ret == -1){
2780
perror_plus("sigaction");
1401
perror("sigaction");
2781
1402
exitcode = EX_OSERR;
2782
1403
goto end;
2783
1404
}
2784
1405
}
2785
1406
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2791
alphasort);
2792
if(ret >= 1){
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2801
continue;
2802
}
2803
if(debug){
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2806
}
2807
free(direntries[i]);
2808
}
2809
free(direntries);
1407
/* If the interface is down, bring it up */
1408
if(strcmp(interface, "none") != 0){
1409
if_index = (AvahiIfIndex) if_nametoindex(interface);
1410
if(if_index == 0){
1411
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1412
exitcode = EX_UNAVAILABLE;
1413
goto end;
1414
}
1415
1416
if(quit_now){
1417
goto end;
1418
}
1419
1420
/* Re-raise priviliges */
1421
errno = 0;
1422
ret = seteuid(0);
1423
if(ret == -1){
1424
perror("seteuid");
1425
}
1426
1427
#ifdef __linux__
1428
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1429
messages about the network interface to mess up the prompt */
1430
ret = klogctl(8, NULL, 5);
1431
bool restore_loglevel = true;
1432
if(ret == -1){
1433
restore_loglevel = false;
1434
perror("klogctl");
1435
}
1436
#endif /* __linux__ */
1437
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1439
if(sd < 0){
1440
perror("socket");
1441
exitcode = EX_OSERR;
1442
#ifdef __linux__
1443
if(restore_loglevel){
1444
ret = klogctl(7, NULL, 0);
1445
if(ret == -1){
1446
perror("klogctl");
1447
}
1448
}
1449
#endif /* __linux__ */
1450
/* Lower privileges */
1451
errno = 0;
1452
ret = seteuid(uid);
1453
if(ret == -1){
1454
perror("seteuid");
1455
}
1456
goto end;
1457
}
1458
strcpy(network.ifr_name, interface);
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1460
if(ret == -1){
1461
perror("ioctl SIOCGIFFLAGS");
1462
#ifdef __linux__
1463
if(restore_loglevel){
1464
ret = klogctl(7, NULL, 0);
1465
if(ret == -1){
1466
perror("klogctl");
1467
}
1468
}
1469
#endif /* __linux__ */
1470
exitcode = EX_OSERR;
1471
/* Lower privileges */
1472
errno = 0;
1473
ret = seteuid(uid);
1474
if(ret == -1){
1475
perror("seteuid");
1476
}
1477
goto end;
1478
}
1479
if((network.ifr_flags & IFF_UP) == 0){
1480
network.ifr_flags |= IFF_UP;
1481
take_down_interface = true;
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
if(ret == -1){
1484
take_down_interface = false;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1487
#ifdef __linux__
1488
if(restore_loglevel){
1489
ret = klogctl(7, NULL, 0);
1490
if(ret == -1){
1491
perror("klogctl");
1492
}
1493
}
1494
#endif /* __linux__ */
1495
/* Lower privileges */
1496
errno = 0;
1497
ret = seteuid(uid);
1498
if(ret == -1){
1499
perror("seteuid");
1500
}
1501
goto end;
1502
}
1503
}
1504
/* sleep checking until interface is running */
1505
for(int i=0; i < delay * 4; i++){
1506
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1507
if(ret == -1){
1508
perror("ioctl SIOCGIFFLAGS");
1509
} else if(network.ifr_flags & IFF_RUNNING){
1510
break;
1511
}
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1513
ret = nanosleep(&sleeptime, NULL);
1514
if(ret == -1 and errno != EINTR){
1515
perror("nanosleep");
1516
}
1517
}
1518
if(not take_down_interface){
1519
/* We won't need the socket anymore */
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1521
if(ret == -1){
1522
perror("close");
1523
}
1524
}
1525
#ifdef __linux__
1526
if(restore_loglevel){
1527
/* Restores kernel loglevel to default */
1528
ret = klogctl(7, NULL, 0);
1529
if(ret == -1){
1530
perror("klogctl");
1531
}
1532
}
1533
#endif /* __linux__ */
1534
/* Lower privileges */
1535
errno = 0;
1536
if(take_down_interface){
1537
/* Lower privileges */
1538
ret = seteuid(uid);
1539
if(ret == -1){
1540
perror("seteuid");
1541
}
2810
1542
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2816
goto end;
2817
}
2818
}
2819
2820
/* Bring up interfaces which are down, and remove any "none"s */
2821
{
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2824
interface))){
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2829
interface);
2830
interface = NULL;
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2835
interface);
2836
interface = NULL;
2837
}
2838
}
2839
break;
2840
}
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2847
} else {
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2854
}
2855
}
2856
}
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
}
2860
}
2861
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2864
if(debug){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2866
mc.interfaces);
2867
}
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1543
/* Lower privileges permanently */
1544
ret = setuid(uid);
1545
if(ret == -1){
1546
perror("setuid");
1547
}
1548
}
2869
1549
}
2870
1550
2871
1551
if(quit_now){
2872
1552
goto end;
2873
1553
}
2874
1554
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1555
ret = init_gnutls_global(pubkey, seckey);
2876
1556
if(ret == -1){
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
1557
fprintf(stderr, "init_gnutls_global failed\n");
2878
1558
exitcode = EX_UNAVAILABLE;
2879
1559
goto end;
2880
1560
} else {
2885
1565
goto end;
2886
1566
}
2887
1567
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
2898
perror_plus("mkdtemp");
1568
tempdir_created = true;
1569
if(mkdtemp(tempdir) == NULL){
1570
tempdir_created = false;
1571
perror("mkdtemp");
2899
1572
goto end;
2900
1573
}
2901
1574
2903
1576
goto end;
2904
1577
}
2905
1578
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2907
fprintf_plus(stderr, "init_gpgme failed\n");
1579
if(not init_gpgme(pubkey, seckey, tempdir)){
1580
fprintf(stderr, "init_gpgme failed\n");
2908
1581
exitcode = EX_UNAVAILABLE;
2909
1582
goto end;
2910
1583
} else {
2919
1592
/* Connect directly, do not use Zeroconf */
2920
1593
/* (Mainly meant for debugging) */
2921
1594
char *address = strrchr(connect_to, ':');
2922
2923
1595
if(address == NULL){
2924
fprintf_plus(stderr, "No colon in address\n");
1596
fprintf(stderr, "No colon in address\n");
2925
1597
exitcode = EX_USAGE;
2926
1598
goto end;
2927
1599
}
2930
1602
goto end;
2931
1603
}
2932
1604
2933
in_port_t port;
1605
uint16_t port;
2934
1606
errno = 0;
2935
1607
tmpmax = strtoimax(address+1, &tmp, 10);
2936
1608
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2937
or tmpmax != (in_port_t)tmpmax){
2938
fprintf_plus(stderr, "Bad port number\n");
1609
or tmpmax != (uint16_t)tmpmax){
1610
fprintf(stderr, "Bad port number\n");
2939
1611
exitcode = EX_USAGE;
2940
1612
goto end;
2941
1613
}
2942
1614
2943
1615
if(quit_now){
2944
1616
goto end;
2945
1617
}
2946
1618
2947
port = (in_port_t)tmpmax;
1619
port = (uint16_t)tmpmax;
2948
1620
*address = '\0';
1621
address = connect_to;
2949
1622
/* Colon in address indicates IPv6 */
2950
1623
int af;
2951
if(strchr(connect_to, ':') != NULL){
1624
if(strchr(address, ':') != NULL){
2952
1625
af = AF_INET6;
2953
/* Accept [] around IPv6 address - see RFC 5952 */
2954
if(connect_to[0] == '[' and address[-1] == ']')
2955
{
2956
connect_to++;
2957
address[-1] = '\0';
2958
}
2959
1626
} else {
2960
1627
af = AF_INET;
2961
1628
}
2962
address = connect_to;
2963
1629
2964
1630
if(quit_now){
2965
1631
goto end;
2966
1632
}
2967
1633
2968
1634
while(not quit_now){
2969
ret = start_mandos_communication(address, port, if_index, af,
2970
&mc);
1635
ret = start_mandos_communication(address, port, if_index, af);
2971
1636
if(quit_now or ret == 0){
2972
1637
break;
2973
1638
}
2974
if(debug){
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2976
(int)retry_interval);
2977
}
2978
sleep((unsigned int)retry_interval);
2979
}
2980
2981
if(not quit_now){
1639
sleep(15);
1640
};
1641
1642
if (not quit_now){
2982
1643
exitcode = EXIT_SUCCESS;
2983
1644
}
2984
1645
2985
1646
goto end;
2986
1647
}
2987
1648
2999
1660
config.publish_domain = 0;
3000
1661
3001
1662
/* Allocate a new server */
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
3004
1666
3005
1667
/* Free the Avahi configuration data */
3006
1668
avahi_server_config_free(&config);
3008
1670
3009
1671
/* Check if creating the Avahi server object succeeded */
3010
1672
if(mc.server == NULL){
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
3013
1675
exitcode = EX_UNAVAILABLE;
3014
1676
goto end;
3015
1677
}
3021
1683
/* Create the Avahi service browser */
3022
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
3023
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3024
NULL, 0, browse_callback,
3025
(void *)&mc);
1686
NULL, 0, browse_callback, NULL);
3026
1687
if(sb == NULL){
3027
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3028
avahi_strerror(avahi_server_errno(mc.server)));
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
3029
1690
exitcode = EX_UNAVAILABLE;
3030
1691
goto end;
3031
1692
}
3037
1698
/* Run the main loop */
3038
1699
3039
1700
if(debug){
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
1701
fprintf(stderr, "Starting Avahi loop search\n");
3041
1702
}
3042
1703
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
3045
if(debug){
3046
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3047
(ret == 0) ? "successfully" : "with error");
3048
}
1704
avahi_simple_poll_loop(mc.simple_poll);
3049
1705
3050
1706
end:
3051
1707
3052
1708
if(debug){
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
1709
fprintf(stderr, "%s exiting\n", argv[0]);
3060
1710
}
3061
1711
3062
1712
/* Cleanup things */
3063
free(mc.interfaces);
3064
3065
1713
if(sb != NULL)
3066
1714
avahi_s_service_browser_free(sb);
3067
1715
3068
1716
if(mc.server != NULL)
3069
1717
avahi_server_free(mc.server);
3070
1718
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
3073
1721
3074
1722
if(gnutls_initialized){
3075
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
3076
1725
gnutls_dh_params_deinit(mc.dh_params);
3077
1726
}
3078
1727
3080
1729
gpgme_release(mc.ctx);
3081
1730
}
3082
1731
3083
/* Cleans up the circular linked list of Mandos servers the client
3084
has seen */
3085
if(mc.current_server != NULL){
3086
mc.current_server->prev->next = NULL;
3087
while(mc.current_server != NULL){
3088
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
3097
free(mc.current_server);
3098
mc.current_server = next;
3099
}
3100
}
3101
3102
/* Re-raise privileges */
3103
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
3131
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
3137
}
3138
}
3139
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
3145
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
3197
/* Removes the GPGME temp directory and all files inside */
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
3200
1806
}
3201
1807
3202
1808
if(quit_now){
3206
1812
&old_sigterm_action,
3207
1813
NULL));
3208
1814
if(ret == -1){
3209
perror_plus("sigaction");
1815
perror("sigaction");
3210
1816
}
3211
1817
do {
3212
1818
ret = raise(signal_received);
3213
1819
} while(ret != 0 and errno == EINTR);
3214
1820
if(ret != 0){
3215
perror_plus("raise");
1821
perror("raise");
3216
1822
abort();
3217
1823
}
3218
1824
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0