To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 681
- compare with another revision
- download diff
- download tarball
- view history from revision 681
- Committer: Teddy Hogeborn
- Date: 2014-05-11 20:09:27 UTC
- Revision ID: teddy@recompile.se-20140511200927-oz7hxlvaj4ufujn1
Do not depend on new version of avahi-daemon or systemd.
* debian/control (Package: mandos/Depends:): Remove the dependency on
"avahi-daemon (>= 0.6.31-3) | systemd-sysv". It is unnecessary
since we have a workaround in debian/mandos.postinst anyway.
* debian/control (Package: mandos/Depends:): Remove the dependency on
"avahi-daemon (>= 0.6.31-3) | systemd-sysv". It is unnecessary
since we have a workaround in debian/mandos.postinst anyway.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
87
97
88
98
#ifdef __linux__
89
99
#include <sys/klog.h> /* klogctl() */
107
117
init_gnutls_session(),
108
118
GNUTLS_* */
109
119
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
112
122
113
123
/* GPGME */
114
124
#include <gpgme.h> /* All GPGME types, constants and
122
132
#define PATHDIR "/conf/conf.d/mandos"
123
133
#define SECKEY "seckey.txt"
124
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
136
126
137
bool debug = false;
127
138
static const char mandos_protocol_version[] = "1";
128
139
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
141
static const char sys_class_net[] = "/sys/class/net";
131
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
132
146
133
/* Doubly linked list that need to be circular linked when ever used */
147
/* Doubly linked list that need to be circularly linked when used */
134
148
typedef struct server{
135
149
const char *ip;
136
uint16_t port;
150
in_port_t port;
137
151
AvahiIfIndex if_index;
138
152
int af;
139
153
struct timespec last_seen;
143
157
144
158
/* Used for passing in values through the Avahi callback functions */
145
159
typedef struct {
146
AvahiSimplePoll *simple_poll;
147
160
AvahiServer *server;
148
161
gnutls_certificate_credentials_t cred;
149
162
unsigned int dh_bits;
151
164
const char *priority;
152
165
gpgme_ctx_t ctx;
153
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
154
169
} mandos_context;
155
170
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
160
173
161
174
sig_atomic_t quit_now = 0;
162
175
int signal_received = 0;
163
176
164
177
/* Function to use when printing errors */
165
178
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
167
183
perror(print_text);
168
184
}
169
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
170
196
/*
171
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
198
* bytes. "buffer_capacity" is how much is currently allocated,
173
199
* "buffer_length" is how much is already used.
174
200
*/
201
__attribute__((nonnull, warn_unused_result))
175
202
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
203
size_t buffer_capacity){
177
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
180
211
return 0;
181
212
}
213
*buffer = new_buf;
182
214
buffer_capacity += BUFFER_SIZE;
183
215
}
184
216
return buffer_capacity;
185
217
}
186
218
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
190
223
int ret;
191
224
server *new_server = malloc(sizeof(server));
192
225
if(new_server == NULL){
193
226
perror_plus("malloc");
194
return -1;
227
return false;
195
228
}
196
229
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
230
.port = port,
231
.if_index = if_index,
232
.af = af };
200
233
if(new_server->ip == NULL){
201
234
perror_plus("strdup");
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
206
244
new_server->next = new_server;
207
245
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
246
*current_server = new_server;
210
247
} else {
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
213
251
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
252
(*current_server)->prev = new_server;
253
}
254
return true;
222
255
}
223
256
224
257
/*
225
258
* Initialize GPGME.
226
259
*/
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
229
265
gpgme_error_t rc;
230
266
gpgme_engine_info_t engine_info;
231
267
232
233
268
/*
234
269
* Helper function to insert pub and seckey to the engine keyring.
235
270
*/
236
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
237
272
int ret;
238
273
int fd;
239
274
gpgme_data_t pgp_data;
246
281
247
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
283
if(rc != GPG_ERR_NO_ERROR){
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
251
286
return false;
252
287
}
253
288
254
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
255
290
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
258
293
return false;
259
294
}
260
295
267
302
}
268
303
269
304
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
271
306
}
272
307
273
308
/* Init GPGME */
274
309
gpgme_check_version(NULL);
275
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
276
311
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
279
314
return false;
280
315
}
281
316
282
/* Set GPGME home directory for the OpenPGP engine only */
317
/* Set GPGME home directory for the OpenPGP engine only */
283
318
rc = gpgme_get_engine_info(&engine_info);
284
319
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
287
322
return false;
288
323
}
289
324
while(engine_info != NULL){
295
330
engine_info = engine_info->next;
296
331
}
297
332
if(engine_info == NULL){
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
299
335
return false;
300
336
}
301
337
302
338
/* Create new GPGME "context" */
303
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
304
340
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
307
344
return false;
308
345
}
309
346
318
355
* Decrypt OpenPGP data.
319
356
* Returns -1 on error
320
357
*/
358
__attribute__((nonnull, warn_unused_result))
321
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
322
360
size_t crypto_size,
323
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
324
363
gpgme_data_t dh_crypto, dh_plain;
325
364
gpgme_error_t rc;
326
365
ssize_t ret;
328
367
ssize_t plaintext_length = 0;
329
368
330
369
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
332
371
}
333
372
334
373
/* Create new GPGME data buffer from memory cryptotext */
335
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
375
0);
337
376
if(rc != GPG_ERR_NO_ERROR){
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
340
379
return -1;
341
380
}
342
381
343
382
/* Create new empty GPGME data buffer for the plaintext */
344
383
rc = gpgme_data_new(&dh_plain);
345
384
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
348
388
gpgme_data_release(dh_crypto);
349
389
return -1;
350
390
}
351
391
352
392
/* Decrypt data from the cryptotext data buffer to the plaintext
353
393
data buffer */
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
355
395
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
358
398
plaintext_length = -1;
359
399
if(debug){
360
400
gpgme_decrypt_result_t result;
361
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
362
402
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
364
404
} else {
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
369
409
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
371
411
}
372
412
gpgme_recipient_t recipient;
373
413
recipient = result->recipients;
374
414
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
381
422
recipient = recipient->next;
382
423
}
383
424
}
386
427
}
387
428
388
429
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
390
431
}
391
432
392
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
399
440
*plaintext = NULL;
400
441
while(true){
401
442
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
443
(size_t)plaintext_length,
444
plaintext_capacity);
404
445
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
408
449
}
409
450
410
451
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
423
464
}
424
465
425
466
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
427
468
for(ssize_t i = 0; i < plaintext_length; i++){
428
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
470
}
440
481
return plaintext_length;
441
482
}
442
483
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
446
487
if(ret == NULL)
447
488
ret = "(unknown)";
448
489
return ret;
449
490
}
450
491
451
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
452
494
static void debuggnutls(__attribute__((unused)) int level,
453
495
const char* string){
454
fprintf(stderr, "GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
455
497
}
456
498
499
__attribute__((nonnull, warn_unused_result))
457
500
static int init_gnutls_global(const char *pubkeyfilename,
458
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
459
503
int ret;
460
504
461
505
if(debug){
462
fprintf(stderr, "Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
463
507
}
464
508
465
509
ret = gnutls_global_init();
466
510
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
469
513
return -1;
470
514
}
471
515
478
522
}
479
523
480
524
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
482
526
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
488
529
gnutls_global_deinit();
489
530
return -1;
490
531
}
491
532
492
533
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
496
538
}
497
539
498
540
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
500
542
GNUTLS_OPENPGP_FMT_BASE64);
501
543
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
507
549
goto globalfail;
508
550
}
509
551
510
552
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
512
554
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
515
558
goto globalfail;
516
559
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
561
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
521
564
goto globalfail;
522
565
}
523
566
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
568
526
569
return 0;
527
570
528
571
globalfail:
529
572
530
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
531
574
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
533
576
return -1;
534
577
}
535
578
536
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
537
582
int ret;
538
583
/* GnuTLS session creation */
539
584
do {
543
588
}
544
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
590
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
548
594
}
549
595
550
596
{
551
597
const char *err;
552
598
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
600
if(quit_now){
555
601
gnutls_deinit(*session);
556
602
return -1;
557
603
}
558
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
605
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
563
609
gnutls_deinit(*session);
564
610
return -1;
565
611
}
567
613
568
614
do {
569
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
616
mc->cred);
571
617
if(quit_now){
572
618
gnutls_deinit(*session);
573
619
return -1;
574
620
}
575
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
622
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
579
625
gnutls_deinit(*session);
580
626
return -1;
581
627
}
583
629
/* ignore client certificate if any. */
584
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
631
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
633
588
634
return 0;
589
635
}
593
639
__attribute__((unused)) const char *txt){}
594
640
595
641
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
597
644
AvahiIfIndex if_index,
598
int af){
645
int af, mandos_context *mc){
599
646
int ret, tcp_sd = -1;
600
647
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
648
struct sockaddr_storage to;
605
649
char *buffer = NULL;
606
650
char *decrypted_buffer = NULL;
607
651
size_t buffer_length = 0;
626
670
pf = PF_INET;
627
671
break;
628
672
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
674
errno = EINVAL;
631
675
return -1;
632
676
}
633
677
634
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
635
711
if(ret != 0){
636
712
return -1;
637
713
}
638
714
639
715
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
642
718
}
643
719
644
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
656
732
657
733
memset(&to, 0, sizeof(to));
658
734
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
737
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
740
}
665
741
if(ret < 0 ){
666
742
int e = errno;
670
746
}
671
747
if(ret == 0){
672
748
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
750
errno = e;
675
751
goto mandos_end;
676
752
}
677
753
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
757
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
688
760
errno = EINVAL;
689
761
goto mandos_end;
690
762
}
691
763
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
765
}
694
766
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
768
}
699
769
700
770
if(quit_now){
708
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
779
perror_plus("if_indextoname");
710
780
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
713
783
}
714
784
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
717
787
}
718
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
790
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
724
795
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
727
800
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
807
}
735
808
}
736
809
740
813
}
741
814
742
815
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
744
818
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
746
821
}
747
822
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
824
int e = errno;
750
825
perror_plus("connect");
751
826
errno = e;
763
838
while(true){
764
839
size_t out_size = strlen(out);
765
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
841
out_size - written));
767
842
if(ret == -1){
768
843
int e = errno;
769
844
perror_plus("write");
789
864
}
790
865
791
866
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
868
}
794
869
795
870
if(quit_now){
796
871
errno = EINTR;
797
872
goto mandos_end;
798
873
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
874
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
880
803
881
if(quit_now){
804
882
errno = EINTR;
815
893
816
894
if(ret != GNUTLS_E_SUCCESS){
817
895
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
897
gnutls_perror(ret);
820
898
}
821
899
errno = EPROTO;
825
903
/* Read OpenPGP packet that contains the wanted password */
826
904
827
905
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
830
908
}
831
909
832
910
while(true){
837
915
}
838
916
839
917
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
918
buffer_capacity);
841
919
if(buffer_capacity == 0){
842
920
int e = errno;
843
921
perror_plus("incbuffer");
870
948
}
871
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
950
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
874
953
gnutls_perror(ret);
875
954
errno = EPROTO;
876
955
goto mandos_end;
877
956
}
878
957
break;
879
958
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
882
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
962
errno = EIO;
884
963
goto mandos_end;
889
968
}
890
969
891
970
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
971
fprintf_plus(stderr, "Closing TLS session\n");
893
972
}
894
973
895
974
if(quit_now){
907
986
908
987
if(buffer_length > 0){
909
988
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
913
991
if(decrypted_buffer_size >= 0){
914
992
915
993
written = 0;
925
1003
if(ret == 0 and ferror(stdout)){
926
1004
int e = errno;
927
1005
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
930
1008
}
931
1009
errno = e;
932
1010
goto mandos_end;
963
1041
return retval;
964
1042
}
965
1043
1044
__attribute__((nonnull))
966
1045
static void resolve_callback(AvahiSServiceResolver *r,
967
1046
AvahiIfIndex interface,
968
1047
AvahiProtocol proto,
976
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1057
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
981
1062
982
1063
/* Called whenever a service has been resolved successfully or
983
1064
timed out */
989
1070
switch(event){
990
1071
default:
991
1072
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
995
1078
break;
996
1079
997
1080
case AVAHI_RESOLVER_FOUND:
999
1082
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1083
avahi_address_snprint(ip, sizeof(ip), address);
1001
1084
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
1005
1088
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1008
1093
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1010
1095
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1013
1102
}
1014
1103
}
1015
1104
}
1025
1114
const char *domain,
1026
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1116
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1030
1121
1031
1122
/* Called whenever a new services becomes available on the LAN or
1032
1123
is removed from the LAN */
1039
1130
default:
1040
1131
case AVAHI_BROWSER_FAILURE:
1041
1132
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1045
1137
return;
1046
1138
1047
1139
case AVAHI_BROWSER_NEW:
1050
1142
the callback function is called the Avahi server will free the
1051
1143
resolver for us. */
1052
1144
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1058
1153
break;
1059
1154
1060
1155
case AVAHI_BROWSER_REMOVE:
1063
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1160
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1067
1163
}
1068
1164
break;
1069
1165
}
1070
1166
}
1071
1167
1072
/* Signal handler that stops main loop after sigterm has been called */
1168
/* Signal handler that stops main loop after SIGTERM */
1073
1169
static void handle_sigterm(int sig){
1074
1170
if(quit_now){
1075
1171
return;
1078
1174
signal_received = sig;
1079
1175
int old_errno = errno;
1080
1176
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1083
1179
}
1084
1180
errno = old_errno;
1085
1181
}
1086
1182
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1198
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
}
1203
return false;
1204
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return true;
1226
}
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1232
}
1233
return false;
1234
}
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1237
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1240
}
1241
return false;
1242
}
1243
1244
/* Accept this device */
1245
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
1087
1251
/*
1088
1252
* This function determines if a directory entry in /sys/class/net
1089
1253
* corresponds to an acceptable network device.
1090
1254
* (This function is passed to scandir(3) as a filter function.)
1091
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1092
1257
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1258
if(if_entry->d_name[0] == '.'){
1096
1259
return 0;
1097
1260
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1188
1273
}
1189
1274
return 1;
1190
1275
}
1191
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1192
1312
int notdotentries(const struct dirent *direntry){
1193
1313
/* Skip "." and ".." */
1194
1314
if(direntry->d_name[0] == '.'
1200
1320
return 1;
1201
1321
}
1202
1322
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1364
if(debug){
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1367
}
1368
return 0;
1369
}
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1372
if(debug){
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1375
}
1376
return 0;
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1382
return 1;
1383
}
1384
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1204
1388
int ret;
1205
1389
struct timespec now;
1206
1390
struct timespec waited_time;
1207
1391
intmax_t block_time;
1208
1392
1209
1393
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1213
1398
}
1214
1399
ret = avahi_simple_poll_iterate(s, -1);
1215
1400
} else {
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1218
1404
}
1219
1405
/* the current time */
1220
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
1410
}
1225
1411
/* Calculating in ms how long time between now and server
1226
1412
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1413
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1415
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1417
/* total time is 10s/10,000ms.
1418
Converting to s from ms by dividing by 1,000,
1419
and ns to ms by dividing by 1,000,000. */
1420
block_time = ((retry_interval
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1234
1427
}
1235
1428
1236
1429
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1241
1434
if(ret == 0){
1242
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1243
1436
return 0;
1244
1437
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1246
1440
if(ret == -1){
1247
1441
perror_plus("clock_gettime");
1248
1442
return -1;
1249
1443
}
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1444
mc->current_server = mc->current_server->next;
1445
block_time = 0; /* Call avahi to find new Mandos
1446
servers, but don't block */
1252
1447
}
1253
1448
1254
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
1450
}
1256
1451
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1452
if(ret > 0 or errno != EINTR){
1258
1453
return (ret != 1) ? ret : 0;
1259
1454
}
1260
1455
}
1261
1456
}
1262
1457
}
1263
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1778
break;
1779
}
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1863
}
1864
1264
1865
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1265
1870
AvahiSServiceBrowser *sb = NULL;
1266
int error;
1871
error_t ret_errno;
1267
1872
int ret;
1268
1873
intmax_t tmpmax;
1269
1874
char *tmp;
1270
1875
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1279
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
1882
const char *seckey = PATHDIR "/" SECKEY;
1281
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1282
1885
1283
1886
bool gnutls_initialized = false;
1284
1887
bool gpgme_initialized = false;
1285
1888
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1889
double retry_interval = 10; /* 10s between trying a server and
1890
retrying the same server again */
1287
1891
1288
1892
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
1893
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1345
1949
.group = 2 },
1346
1950
{ .name = "retry", .key = 132,
1347
1951
.arg = "SECONDS",
1348
.doc = "Retry interval used when denied by the mandos server",
1952
.doc = "Retry interval used when denied by the Mandos server",
1953
.group = 2 },
1954
{ .name = "network-hook-dir", .key = 133,
1955
.arg = "DIR",
1956
.doc = "Directory where network hooks are located",
1349
1957
.group = 2 },
1350
1958
/*
1351
1959
* These reproduce what we would get without ARGP_NO_HELP
1370
1978
connect_to = arg;
1371
1979
break;
1372
1980
case 'i': /* --interface */
1373
interface = arg;
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1374
1986
break;
1375
1987
case 's': /* --seckey */
1376
1988
seckey = arg;
1400
2012
errno = 0;
1401
2013
retry_interval = strtod(arg, &tmp);
1402
2014
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
2015
or (retry_interval * 1000) > INT_MAX
2016
or retry_interval < 0){
1404
2017
argp_error(state, "Bad retry interval");
1405
2018
}
1406
2019
break;
2020
case 133: /* --network-hook-dir */
2021
hookdir = arg;
2022
break;
1407
2023
/*
1408
2024
* These reproduce what we would get without ARGP_NO_HELP
1409
2025
*/
1415
2031
argp_state_help(state, state->out_stream,
1416
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
2033
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
2035
exit(argp_err_exit_status);
1420
2036
break;
1421
2037
default:
1444
2060
goto end;
1445
2061
}
1446
2062
}
2063
2064
{
2065
/* Work around Debian bug #633582:
2066
<http://bugs.debian.org/633582> */
2067
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
2073
} else {
2074
struct stat st;
2075
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2080
} else {
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2082
if(ret == -1){
2083
perror_plus("fstat");
2084
} else {
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2088
if(ret == -1){
2089
perror_plus("fchown");
2090
}
2091
}
2092
}
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2094
}
2095
}
2096
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2101
} else {
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2103
if(ret == -1){
2104
perror_plus("fstat");
2105
} else {
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2109
if(ret == -1){
2110
perror_plus("fchown");
2111
}
2112
}
2113
}
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2115
}
2116
}
2117
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
2140
}
2141
}
2142
}
2143
2144
/* Run network hooks */
2145
{
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
2157
}
1447
2158
1448
2159
if(not debug){
1449
2160
avahi_set_log_function(empty_log);
1450
2161
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
1476
2162
1477
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
2164
from the signal handler */
1479
2165
/* Initialize the pseudo-RNG for Avahi */
1480
2166
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2169
fprintf_plus(stderr,
2170
"Avahi: Failed to create simple poll object.\n");
1484
2171
exitcode = EX_UNAVAILABLE;
1485
2172
goto end;
1486
2173
}
1548
2235
}
1549
2236
}
1550
2237
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
2260
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
1636
2285
}
1637
2286
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
2287
break;
1655
2288
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1693
2316
}
1694
2317
1695
2318
if(quit_now){
1696
2319
goto end;
1697
2320
}
1698
2321
1699
ret = init_gnutls_global(pubkey, seckey);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
1700
2323
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2325
exitcode = EX_UNAVAILABLE;
1703
2326
goto end;
1704
2327
} else {
1709
2332
goto end;
1710
2333
}
1711
2334
1712
if(mkdtemp(tempdir) == NULL){
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
1713
2345
perror_plus("mkdtemp");
1714
2346
goto end;
1715
2347
}
1716
tempdir_created = true;
1717
2348
1718
2349
if(quit_now){
1719
2350
goto end;
1720
2351
}
1721
2352
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2354
fprintf_plus(stderr, "init_gpgme failed\n");
1724
2355
exitcode = EX_UNAVAILABLE;
1725
2356
goto end;
1726
2357
} else {
1735
2366
/* Connect directly, do not use Zeroconf */
1736
2367
/* (Mainly meant for debugging) */
1737
2368
char *address = strrchr(connect_to, ':');
2369
1738
2370
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
2371
fprintf_plus(stderr, "No colon in address\n");
1740
2372
exitcode = EX_USAGE;
1741
2373
goto end;
1742
2374
}
1745
2377
goto end;
1746
2378
}
1747
2379
1748
uint16_t port;
2380
in_port_t port;
1749
2381
errno = 0;
1750
2382
tmpmax = strtoimax(address+1, &tmp, 10);
1751
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2384
or tmpmax != (in_port_t)tmpmax){
2385
fprintf_plus(stderr, "Bad port number\n");
1754
2386
exitcode = EX_USAGE;
1755
2387
goto end;
1756
2388
}
1757
2389
1758
2390
if(quit_now){
1759
2391
goto end;
1760
2392
}
1761
2393
1762
port = (uint16_t)tmpmax;
2394
port = (in_port_t)tmpmax;
1763
2395
*address = '\0';
1764
address = connect_to;
1765
2396
/* Colon in address indicates IPv6 */
1766
2397
int af;
1767
if(strchr(address, ':') != NULL){
2398
if(strchr(connect_to, ':') != NULL){
1768
2399
af = AF_INET6;
2400
/* Accept [] around IPv6 address - see RFC 5952 */
2401
if(connect_to[0] == '[' and address[-1] == ']')
2402
{
2403
connect_to++;
2404
address[-1] = '\0';
2405
}
1769
2406
} else {
1770
2407
af = AF_INET;
1771
2408
}
2409
address = connect_to;
1772
2410
1773
2411
if(quit_now){
1774
2412
goto end;
1775
2413
}
1776
2414
1777
2415
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
1779
2418
if(quit_now or ret == 0){
1780
2419
break;
1781
2420
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
2421
if(debug){
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
(int)retry_interval);
2424
}
2425
sleep((unsigned int)retry_interval);
2426
}
2427
2428
if(not quit_now){
1786
2429
exitcode = EXIT_SUCCESS;
1787
2430
}
1788
2431
1789
2432
goto end;
1790
2433
}
1791
2434
1803
2446
config.publish_domain = 0;
1804
2447
1805
2448
/* Allocate a new server */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
1809
2451
1810
2452
/* Free the Avahi configuration data */
1811
2453
avahi_server_config_free(&config);
1813
2455
1814
2456
/* Check if creating the Avahi server object succeeded */
1815
2457
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
1818
2460
exitcode = EX_UNAVAILABLE;
1819
2461
goto end;
1820
2462
}
1826
2468
/* Create the Avahi service browser */
1827
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
1830
2473
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
avahi_strerror(avahi_server_errno(mc.server)));
1833
2476
exitcode = EX_UNAVAILABLE;
1834
2477
goto end;
1835
2478
}
1841
2484
/* Run the main loop */
1842
2485
1843
2486
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
2488
}
1846
2489
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
1848
2492
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
(ret == 0) ? "successfully" : "with error");
1851
2495
}
1852
2496
1853
2497
end:
1854
2498
1855
2499
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2500
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1857
2501
}
1858
2502
1859
2503
/* Cleanup things */
2504
free(mc.interfaces);
2505
1860
2506
if(sb != NULL)
1861
2507
avahi_s_service_browser_free(sb);
1862
2508
1863
2509
if(mc.server != NULL)
1864
2510
avahi_server_free(mc.server);
1865
2511
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
1868
2514
1869
2515
if(gnutls_initialized){
1870
2516
gnutls_certificate_free_credentials(mc.cred);
1875
2521
if(gpgme_initialized){
1876
2522
gpgme_release(mc.ctx);
1877
2523
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2524
2525
/* Cleans up the circular linked list of Mandos servers the client
2526
has seen */
1880
2527
if(mc.current_server != NULL){
1881
2528
mc.current_server->prev->next = NULL;
1882
2529
while(mc.current_server != NULL){
1886
2533
}
1887
2534
}
1888
2535
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
2536
/* Re-raise privileges */
2537
{
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
2541
} else {
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
1896
2564
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
2565
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
1918
2569
}
1919
2570
}
1920
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2574
1921
2575
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
2576
if(tempdir != NULL){
1923
2577
struct dirent **direntries = NULL;
1924
2578
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
alphasort);
2581
if(numentries > 0){
2582
for(int i = 0; i < numentries; i++){
1928
2583
direntry = direntries[i];
1929
2584
char *fullname = NULL;
1930
2585
ret = asprintf(&fullname, "%s/%s", tempdir,
1935
2590
}
1936
2591
ret = remove(fullname);
1937
2592
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
2593
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2594
strerror(errno));
1940
2595
}
1941
2596
free(fullname);
1942
2597
}
1943
2598
}
1944
2599
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
2600
/* need to clean even if 0 because man page doesn't specify */
1946
2601
free(direntries);
1947
if (ret == -1){
2602
if(numentries == -1){
1948
2603
perror_plus("scandir");
1949
2604
}
1950
2605
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0