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- Committer: Teddy Hogeborn
- Date: 2011-11-27 02:32:20 UTC
- mto: (505.2.10 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111127023220-bih6el7s0q6jhtci
* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
- files added:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
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
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
86
90
87
91
#ifdef __linux__
88
92
#include <sys/klog.h> /* klogctl() */
106
110
init_gnutls_session(),
107
111
GNUTLS_* */
108
112
#include <gnutls/openpgp.h>
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
111
115
112
116
/* GPGME */
113
117
#include <gpgme.h> /* All GPGME types, constants and
121
125
#define PATHDIR "/conf/conf.d/mandos"
122
126
#define SECKEY "seckey.txt"
123
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
129
125
130
bool debug = false;
126
131
static const char mandos_protocol_version[] = "1";
127
132
const char *argp_program_version = "mandos-client " VERSION;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
129
148
130
149
/* Used for passing in values through the Avahi callback functions */
131
150
typedef struct {
136
155
gnutls_dh_params_t dh_params;
137
156
const char *priority;
138
157
gpgme_ctx_t ctx;
158
server *current_server;
139
159
} mandos_context;
140
160
141
161
/* global context so signal handler can reach it*/
142
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
163
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
145
166
146
167
sig_atomic_t quit_now = 0;
147
168
int signal_received = 0;
148
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
185
149
186
/*
150
187
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
188
* bytes. "buffer_capacity" is how much is currently allocated,
152
189
* "buffer_length" is how much is already used.
153
190
*/
154
191
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
192
size_t buffer_capacity){
156
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
195
if(buffer == NULL){
163
200
return buffer_capacity;
164
201
}
165
202
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
206
int ret;
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
210
return -1;
211
}
212
*new_server = (server){ .ip = strdup(ip),
213
.port = port,
214
.if_index = if_index,
215
.af = af };
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
218
return -1;
219
}
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
226
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
238
}
239
166
240
/*
167
241
* Initialize GPGME.
168
242
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
171
245
gpgme_error_t rc;
172
246
gpgme_engine_info_t engine_info;
173
247
182
256
183
257
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
258
if(fd == -1){
185
perror("open");
259
perror_plus("open");
186
260
return false;
187
261
}
188
262
189
263
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
264
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
193
267
return false;
194
268
}
195
269
196
270
rc = gpgme_op_import(mc.ctx, pgp_data);
197
271
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
200
274
return false;
201
275
}
202
276
203
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
278
if(ret == -1){
205
perror("close");
279
perror_plus("close");
206
280
}
207
281
gpgme_data_release(pgp_data);
208
282
return true;
209
283
}
210
284
211
285
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
286
fprintf_plus(stderr, "Initializing GPGME\n");
213
287
}
214
288
215
289
/* Init GPGME */
216
290
gpgme_check_version(NULL);
217
291
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
292
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
221
295
return false;
222
296
}
223
297
224
/* Set GPGME home directory for the OpenPGP engine only */
298
/* Set GPGME home directory for the OpenPGP engine only */
225
299
rc = gpgme_get_engine_info(&engine_info);
226
300
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
229
303
return false;
230
304
}
231
305
while(engine_info != NULL){
237
311
engine_info = engine_info->next;
238
312
}
239
313
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
241
316
return false;
242
317
}
243
318
244
319
/* Create new GPGME "context" */
245
320
rc = gpgme_new(&(mc.ctx));
246
321
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
249
325
return false;
250
326
}
251
327
270
346
ssize_t plaintext_length = 0;
271
347
272
348
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
350
}
275
351
276
352
/* Create new GPGME data buffer from memory cryptotext */
277
353
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
354
0);
279
355
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
282
358
return -1;
283
359
}
284
360
285
361
/* Create new empty GPGME data buffer for the plaintext */
286
362
rc = gpgme_data_new(&dh_plain);
287
363
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
290
367
gpgme_data_release(dh_crypto);
291
368
return -1;
292
369
}
295
372
data buffer */
296
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
374
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
300
377
plaintext_length = -1;
301
378
if(debug){
302
379
gpgme_decrypt_result_t result;
303
380
result = gpgme_op_decrypt_result(mc.ctx);
304
381
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
383
} else {
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
311
388
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
390
}
314
391
gpgme_recipient_t recipient;
315
392
recipient = result->recipients;
316
393
while(recipient != NULL){
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
323
401
recipient = recipient->next;
324
402
}
325
403
}
328
406
}
329
407
330
408
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
410
}
333
411
334
412
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
413
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
414
perror_plus("gpgme_data_seek");
337
415
plaintext_length = -1;
338
416
goto decrypt_end;
339
417
}
341
419
*plaintext = NULL;
342
420
while(true){
343
421
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
422
(size_t)plaintext_length,
423
plaintext_capacity);
346
424
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
350
428
}
351
429
352
430
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
435
break;
358
436
}
359
437
if(ret < 0){
360
perror("gpgme_data_read");
438
perror_plus("gpgme_data_read");
361
439
plaintext_length = -1;
362
440
goto decrypt_end;
363
441
}
365
443
}
366
444
367
445
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
446
fprintf_plus(stderr, "Decrypted password is: ");
369
447
for(ssize_t i = 0; i < plaintext_length; i++){
370
448
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
449
}
393
471
/* GnuTLS log function callback */
394
472
static void debuggnutls(__attribute__((unused)) int level,
395
473
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
474
fprintf_plus(stderr, "GnuTLS: %s", string);
397
475
}
398
476
399
477
static int init_gnutls_global(const char *pubkeyfilename,
401
479
int ret;
402
480
403
481
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
483
}
406
484
407
485
ret = gnutls_global_init();
408
486
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
411
489
return -1;
412
490
}
413
491
420
498
}
421
499
422
500
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
502
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
430
505
gnutls_global_deinit();
431
506
return -1;
432
507
}
433
508
434
509
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
438
514
}
439
515
440
516
ret = gnutls_certificate_set_openpgp_key_file
441
517
(mc.cred, pubkeyfilename, seckeyfilename,
442
518
GNUTLS_OPENPGP_FMT_BASE64);
443
519
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
449
525
goto globalfail;
450
526
}
451
527
452
528
/* GnuTLS server initialization */
453
529
ret = gnutls_dh_params_init(&mc.dh_params);
454
530
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
457
534
goto globalfail;
458
535
}
459
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
537
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
463
540
goto globalfail;
464
541
}
465
542
485
562
}
486
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
564
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
490
568
}
491
569
492
570
{
499
577
}
500
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
579
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
505
583
gnutls_deinit(*session);
506
584
return -1;
507
585
}
516
594
}
517
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
596
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
521
599
gnutls_deinit(*session);
522
600
return -1;
523
601
}
553
631
gnutls_session_t session;
554
632
int pf; /* Protocol family */
555
633
634
errno = 0;
635
556
636
if(quit_now){
637
errno = EINTR;
557
638
return -1;
558
639
}
559
640
565
646
pf = PF_INET;
566
647
break;
567
648
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
569
651
return -1;
570
652
}
571
653
575
657
}
576
658
577
659
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
580
662
}
581
663
582
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
665
if(tcp_sd < 0){
584
perror("socket");
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
585
669
goto mandos_end;
586
670
}
587
671
588
672
if(quit_now){
673
errno = EINTR;
589
674
goto mandos_end;
590
675
}
591
676
598
683
ret = inet_pton(af, ip, &to.in.sin_addr);
599
684
}
600
685
if(ret < 0 ){
601
perror("inet_pton");
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
602
689
goto mandos_end;
603
690
}
604
691
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
606
695
goto mandos_end;
607
696
}
608
697
if(af == AF_INET6){
612
701
613
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
704
-Wunreachable-code*/
616
705
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
708
errno = EINVAL;
619
709
goto mandos_end;
620
710
}
621
711
/* Set the network interface number as scope */
628
718
}
629
719
630
720
if(quit_now){
721
errno = EINTR;
631
722
goto mandos_end;
632
723
}
633
724
635
726
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
727
char interface[IF_NAMESIZE];
637
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
729
perror_plus("if_indextoname");
639
730
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
642
733
}
643
734
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
646
737
}
647
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
655
746
sizeof(addrstr));
656
747
}
657
748
if(pcret == NULL){
658
perror("inet_ntop");
749
perror_plus("inet_ntop");
659
750
} else {
660
751
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
753
}
663
754
}
664
755
}
665
756
666
757
if(quit_now){
758
errno = EINTR;
667
759
goto mandos_end;
668
760
}
669
761
673
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
766
}
675
767
if(ret < 0){
676
perror("connect");
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
677
773
goto mandos_end;
678
774
}
679
775
680
776
if(quit_now){
777
errno = EINTR;
681
778
goto mandos_end;
682
779
}
683
780
686
783
while(true){
687
784
size_t out_size = strlen(out);
688
785
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
786
out_size - written));
690
787
if(ret == -1){
691
perror("write");
788
int e = errno;
789
perror_plus("write");
790
errno = e;
692
791
goto mandos_end;
693
792
}
694
793
written += (size_t)ret;
704
803
}
705
804
706
805
if(quit_now){
806
errno = EINTR;
707
807
goto mandos_end;
708
808
}
709
809
}
710
810
711
811
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
813
}
714
814
715
815
if(quit_now){
816
errno = EINTR;
716
817
goto mandos_end;
717
818
}
718
819
820
/* Spurious warning from -Wint-to-pointer-cast */
719
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
822
721
823
if(quit_now){
824
errno = EINTR;
722
825
goto mandos_end;
723
826
}
724
827
725
828
do {
726
829
ret = gnutls_handshake(session);
727
830
if(quit_now){
831
errno = EINTR;
728
832
goto mandos_end;
729
833
}
730
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
835
732
836
if(ret != GNUTLS_E_SUCCESS){
733
837
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
839
gnutls_perror(ret);
736
840
}
841
errno = EPROTO;
737
842
goto mandos_end;
738
843
}
739
844
740
845
/* Read OpenPGP packet that contains the wanted password */
741
846
742
847
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
745
850
}
746
851
747
852
while(true){
748
853
749
854
if(quit_now){
855
errno = EINTR;
750
856
goto mandos_end;
751
857
}
752
858
753
859
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
860
buffer_capacity);
755
861
if(buffer_capacity == 0){
756
perror("incbuffer");
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
757
865
goto mandos_end;
758
866
}
759
867
760
868
if(quit_now){
869
errno = EINTR;
761
870
goto mandos_end;
762
871
}
763
872
776
885
ret = gnutls_handshake(session);
777
886
778
887
if(quit_now){
888
errno = EINTR;
779
889
goto mandos_end;
780
890
}
781
891
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
892
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
784
895
gnutls_perror(ret);
896
errno = EPROTO;
785
897
goto mandos_end;
786
898
}
787
899
break;
788
900
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
791
903
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
792
905
goto mandos_end;
793
906
}
794
907
} else {
797
910
}
798
911
799
912
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
913
fprintf_plus(stderr, "Closing TLS session\n");
801
914
}
802
915
803
916
if(quit_now){
917
errno = EINTR;
804
918
goto mandos_end;
805
919
}
806
920
807
921
do {
808
922
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
923
if(quit_now){
924
errno = EINTR;
810
925
goto mandos_end;
811
926
}
812
927
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
928
814
929
if(buffer_length > 0){
815
930
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
818
932
&decrypted_buffer);
819
933
if(decrypted_buffer_size >= 0){
820
934
821
935
written = 0;
822
936
while(written < (size_t) decrypted_buffer_size){
823
937
if(quit_now){
938
errno = EINTR;
824
939
goto mandos_end;
825
940
}
826
941
828
943
(size_t)decrypted_buffer_size - written,
829
944
stdout);
830
945
if(ret == 0 and ferror(stdout)){
946
int e = errno;
831
947
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
834
950
}
951
errno = e;
835
952
goto mandos_end;
836
953
}
837
954
written += (size_t)ret;
843
960
/* Shutdown procedure */
844
961
845
962
mandos_end:
846
free(decrypted_buffer);
847
free(buffer);
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
963
{
964
int e = errno;
965
free(decrypted_buffer);
966
free(buffer);
967
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
969
}
970
if(ret == -1){
971
if(e == 0){
972
e = errno;
973
}
974
perror_plus("close");
975
}
976
gnutls_deinit(session);
977
errno = e;
978
if(quit_now){
979
errno = EINTR;
980
retval = -1;
981
}
857
982
}
858
983
return retval;
859
984
}
884
1009
switch(event){
885
1010
default:
886
1011
case AVAHI_RESOLVER_FAILURE:
887
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
888
" of type '%s' in domain '%s': %s\n", name, type, domain,
889
avahi_strerror(avahi_server_errno(mc.server)));
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
890
1016
break;
891
1017
892
1018
case AVAHI_RESOLVER_FOUND:
894
1020
char ip[AVAHI_ADDRESS_STR_MAX];
895
1021
avahi_address_snprint(ip, sizeof(ip), address);
896
1022
if(debug){
897
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
898
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
899
ip, (intmax_t)interface, port);
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
900
1026
}
901
1027
int ret = start_mandos_communication(ip, port, interface,
902
1028
avahi_proto_to_af(proto));
903
1029
if(ret == 0){
904
1030
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
905
1034
}
906
1035
}
907
1036
}
931
1060
default:
932
1061
case AVAHI_BROWSER_FAILURE:
933
1062
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
936
1065
avahi_simple_poll_quit(mc.simple_poll);
937
1066
return;
938
1067
945
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
1075
name, type, domain, protocol, 0,
947
1076
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
950
1080
break;
951
1081
952
1082
case AVAHI_BROWSER_REMOVE:
955
1085
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1086
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1087
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
959
1090
}
960
1091
break;
961
1092
}
962
1093
}
963
1094
964
/* stop main loop after sigterm has been called */
1095
/* Signal handler that stops main loop after SIGTERM */
965
1096
static void handle_sigterm(int sig){
966
1097
if(quit_now){
967
1098
return;
969
1100
quit_now = 1;
970
1101
signal_received = sig;
971
1102
int old_errno = errno;
1103
/* set main loop to exit */
972
1104
if(mc.simple_poll != NULL){
973
1105
avahi_simple_poll_quit(mc.simple_poll);
974
1106
}
975
1107
errno = old_errno;
976
1108
}
977
1109
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1121
if(debug){
1122
perror_plus("ioctl SIOCGIFFLAGS");
1123
}
1124
return false;
1125
}
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1133
if(debug){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1136
}
1137
return false;
1138
}
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1141
if(debug){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1144
}
1145
return true;
1146
}
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1149
if(debug){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1152
}
1153
return false;
1154
}
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1157
if(debug){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1160
}
1161
return false;
1162
}
1163
1164
/* Accept this device */
1165
if(debug){
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1245
return 0;
1246
}
1247
return 1;
1248
}
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(debug){
1305
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1306
direntry->d_name);
1307
}
1308
return 1;
1309
}
1310
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1312
int ret;
1313
struct timespec now;
1314
struct timespec waited_time;
1315
intmax_t block_time;
1316
1317
while(true){
1318
if(mc.current_server == NULL){
1319
if (debug){
1320
fprintf_plus(stderr, "Wait until first server is found."
1321
" No timeout!\n");
1322
}
1323
ret = avahi_simple_poll_iterate(s, -1);
1324
} else {
1325
if (debug){
1326
fprintf_plus(stderr, "Check current_server if we should run"
1327
" it, or wait\n");
1328
}
1329
/* the current time */
1330
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1331
if(ret == -1){
1332
perror_plus("clock_gettime");
1333
return -1;
1334
}
1335
/* Calculating in ms how long time between now and server
1336
who we visted longest time ago. Now - last seen. */
1337
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1339
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1341
/* total time is 10s/10,000ms.
1342
Converting to s from ms by dividing by 1,000,
1343
and ns to ms by dividing by 1,000,000. */
1344
block_time = ((retry_interval
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1347
1348
if (debug){
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1350
block_time);
1351
}
1352
1353
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1358
if(ret == 0){
1359
avahi_simple_poll_quit(mc.simple_poll);
1360
return 0;
1361
}
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1364
if(ret == -1){
1365
perror_plus("clock_gettime");
1366
return -1;
1367
}
1368
mc.current_server = mc.current_server->next;
1369
block_time = 0; /* Call avahi to find new Mandos
1370
servers, but don't block */
1371
}
1372
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1374
}
1375
if(ret != 0){
1376
if (ret > 0 or errno != EINTR){
1377
return (ret != 1) ? ret : 0;
1378
}
1379
}
1380
}
1381
}
1382
1383
bool run_network_hooks(const char *mode, const char *interface,
1384
const float delay){
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
alphasort);
1390
if(numhooks == -1){
1391
perror_plus("scandir");
1392
} else {
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1398
if(ret < 0){
1399
perror_plus("asprintf");
1400
continue;
1401
}
1402
if(debug){
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1404
direntry->d_name);
1405
}
1406
pid_t hook_pid = fork();
1407
if(hook_pid == 0){
1408
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
if(ret == -1){
1414
perror_plus("setenv");
1415
return false;
1416
}
1417
ret = setenv("DEVICE", interface, 1);
1418
if(ret == -1){
1419
perror_plus("setenv");
1420
return false;
1421
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1423
if(ret == -1){
1424
perror_plus("setenv");
1425
return false;
1426
}
1427
ret = setenv("MODE", mode, 1);
1428
if(ret == -1){
1429
perror_plus("setenv");
1430
return false;
1431
}
1432
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1434
if(ret == -1){
1435
perror_plus("asprintf");
1436
return false;
1437
}
1438
ret = setenv("DELAY", delaystring, 1);
1439
if(ret == -1){
1440
free(delaystring);
1441
perror_plus("setenv");
1442
return false;
1443
}
1444
free(delaystring);
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1447
} else {
1448
int status;
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1451
free(fullname);
1452
continue;
1453
}
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1459
free(fullname);
1460
continue;
1461
}
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1465
WTERMSIG(status));
1466
free(fullname);
1467
continue;
1468
} else {
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1471
free(fullname);
1472
continue;
1473
}
1474
}
1475
free(fullname);
1476
if(debug){
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1478
direntry->d_name);
1479
}
1480
}
1481
close(devnull);
1482
}
1483
return true;
1484
}
1485
978
1486
int main(int argc, char *argv[]){
979
1487
AvahiSServiceBrowser *sb = NULL;
980
1488
int error;
982
1490
intmax_t tmpmax;
983
1491
char *tmp;
984
1492
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1493
const char *interface = "";
986
1494
struct ifreq network;
987
1495
int sd = -1;
988
1496
bool take_down_interface = false;
989
1497
uid_t uid;
990
1498
gid_t gid;
991
char *connect_to = NULL;
992
1499
char tempdir[] = "/tmp/mandosXXXXXX";
993
1500
bool tempdir_created = false;
994
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
998
1505
bool gnutls_initialized = false;
999
1506
bool gpgme_initialized = false;
1000
1507
float delay = 2.5f;
1508
double retry_interval = 10; /* 10s between trying a server and
1509
retrying the same server again */
1001
1510
1002
1511
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1512
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1518
errno = 0;
1010
1519
ret = setgid(gid);
1011
1520
if(ret == -1){
1012
perror("setgid");
1521
perror_plus("setgid");
1013
1522
}
1014
1523
1015
1524
/* Lower user privileges (temporarily) */
1016
1525
errno = 0;
1017
1526
ret = seteuid(uid);
1018
1527
if(ret == -1){
1019
perror("seteuid");
1528
perror_plus("seteuid");
1020
1529
}
1021
1530
1022
1531
if(quit_now){
1057
1566
.arg = "SECONDS",
1058
1567
.doc = "Maximum delay to wait for interface startup",
1059
1568
.group = 2 },
1569
{ .name = "retry", .key = 132,
1570
.arg = "SECONDS",
1571
.doc = "Retry interval used when denied by the mandos server",
1572
.group = 2 },
1573
{ .name = "network-hook-dir", .key = 133,
1574
.arg = "DIR",
1575
.doc = "Directory where network hooks are located",
1576
.group = 2 },
1060
1577
/*
1061
1578
* These reproduce what we would get without ARGP_NO_HELP
1062
1579
*/
1106
1623
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1624
argp_error(state, "Bad delay");
1108
1625
}
1626
case 132: /* --retry */
1627
errno = 0;
1628
retry_interval = strtod(arg, &tmp);
1629
if(errno != 0 or tmp == arg or *tmp != '\0'
1630
or (retry_interval * 1000) > INT_MAX
1631
or retry_interval < 0){
1632
argp_error(state, "Bad retry interval");
1633
}
1634
break;
1635
case 133: /* --network-hook-dir */
1636
hookdir = arg;
1109
1637
break;
1110
1638
/*
1111
1639
* These reproduce what we would get without ARGP_NO_HELP
1118
1646
argp_state_help(state, state->out_stream,
1119
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
1648
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
1652
exit(argp_err_exit_status);
1123
1653
break;
1124
1654
default:
1139
1669
case ENOMEM:
1140
1670
default:
1141
1671
errno = ret;
1142
perror("argp_parse");
1672
perror_plus("argp_parse");
1143
1673
exitcode = EX_OSERR;
1144
1674
goto end;
1145
1675
case EINVAL:
1147
1677
goto end;
1148
1678
}
1149
1679
}
1680
1681
if(getuid() == 0){
1682
/* Work around Debian bug #633582:
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
1740
}
1741
}
1742
1743
/* Run network hooks */
1744
{
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
1764
}
1150
1765
1151
1766
if(not debug){
1152
1767
avahi_set_log_function(empty_log);
1153
1768
}
1154
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
1155
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1803
from the signal handler */
1157
1804
/* Initialize the pseudo-RNG for Avahi */
1158
1805
srand((unsigned int) time(NULL));
1159
1806
mc.simple_poll = avahi_simple_poll_new();
1160
1807
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1808
fprintf_plus(stderr,
1809
"Avahi: Failed to create simple poll object.\n");
1810
exitcode = EX_UNAVAILABLE;
1163
1811
goto end;
1164
1812
}
1165
1813
1166
1814
sigemptyset(&sigterm_action.sa_mask);
1167
1815
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
1816
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1817
perror_plus("sigaddset");
1818
exitcode = EX_OSERR;
1171
1819
goto end;
1172
1820
}
1173
1821
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
1822
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1823
perror_plus("sigaddset");
1824
exitcode = EX_OSERR;
1177
1825
goto end;
1178
1826
}
1179
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
1828
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1183
1831
goto end;
1184
1832
}
1185
1833
/* Need to check if the handler is SIG_IGN before handling:
1188
1836
*/
1189
1837
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
1838
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1839
perror_plus("sigaction");
1840
return EX_OSERR;
1193
1841
}
1194
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1843
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
1844
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1199
1847
goto end;
1200
1848
}
1201
1849
}
1202
1850
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
1851
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1852
perror_plus("sigaction");
1853
return EX_OSERR;
1206
1854
}
1207
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1856
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
1857
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1212
1860
goto end;
1213
1861
}
1214
1862
}
1215
1863
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
1864
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1865
perror_plus("sigaction");
1866
return EX_OSERR;
1219
1867
}
1220
1868
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1869
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
1870
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1871
perror_plus("sigaction");
1872
exitcode = EX_OSERR;
1225
1873
goto end;
1226
1874
}
1227
1875
}
1228
1876
1229
1877
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1878
if(strcmp(interface, "none") != 0){
1231
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1880
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1235
1883
goto end;
1236
1884
}
1237
1885
1243
1891
errno = 0;
1244
1892
ret = seteuid(0);
1245
1893
if(ret == -1){
1246
perror("seteuid");
1894
perror_plus("seteuid");
1247
1895
}
1248
1896
1249
1897
#ifdef __linux__
1253
1901
bool restore_loglevel = true;
1254
1902
if(ret == -1){
1255
1903
restore_loglevel = false;
1256
perror("klogctl");
1904
perror_plus("klogctl");
1257
1905
}
1258
1906
#endif /* __linux__ */
1259
1907
1260
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
1909
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1264
1912
#ifdef __linux__
1265
1913
if(restore_loglevel){
1266
1914
ret = klogctl(7, NULL, 0);
1267
1915
if(ret == -1){
1268
perror("klogctl");
1916
perror_plus("klogctl");
1269
1917
}
1270
1918
}
1271
1919
#endif /* __linux__ */
1273
1921
errno = 0;
1274
1922
ret = seteuid(uid);
1275
1923
if(ret == -1){
1276
perror("seteuid");
1924
perror_plus("seteuid");
1277
1925
}
1278
1926
goto end;
1279
1927
}
1280
1928
strcpy(network.ifr_name, interface);
1281
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
1930
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1931
perror_plus("ioctl SIOCGIFFLAGS");
1284
1932
#ifdef __linux__
1285
1933
if(restore_loglevel){
1286
1934
ret = klogctl(7, NULL, 0);
1287
1935
if(ret == -1){
1288
perror("klogctl");
1936
perror_plus("klogctl");
1289
1937
}
1290
1938
}
1291
1939
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1940
exitcode = EX_OSERR;
1293
1941
/* Lower privileges */
1294
1942
errno = 0;
1295
1943
ret = seteuid(uid);
1296
1944
if(ret == -1){
1297
perror("seteuid");
1945
perror_plus("seteuid");
1298
1946
}
1299
1947
goto end;
1300
1948
}
1304
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
1953
if(ret == -1){
1306
1954
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1309
1957
#ifdef __linux__
1310
1958
if(restore_loglevel){
1311
1959
ret = klogctl(7, NULL, 0);
1312
1960
if(ret == -1){
1313
perror("klogctl");
1961
perror_plus("klogctl");
1314
1962
}
1315
1963
}
1316
1964
#endif /* __linux__ */
1318
1966
errno = 0;
1319
1967
ret = seteuid(uid);
1320
1968
if(ret == -1){
1321
perror("seteuid");
1969
perror_plus("seteuid");
1322
1970
}
1323
1971
goto end;
1324
1972
}
1325
1973
}
1326
/* sleep checking until interface is running */
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1327
1976
for(int i=0; i < delay * 4; i++){
1328
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
1978
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1979
perror_plus("ioctl SIOCGIFFLAGS");
1331
1980
} else if(network.ifr_flags & IFF_RUNNING){
1332
1981
break;
1333
1982
}
1334
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
1984
ret = nanosleep(&sleeptime, NULL);
1336
1985
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1986
perror_plus("nanosleep");
1338
1987
}
1339
1988
}
1340
1989
if(not take_down_interface){
1341
1990
/* We won't need the socket anymore */
1342
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
1992
if(ret == -1){
1344
perror("close");
1993
perror_plus("close");
1345
1994
}
1346
1995
}
1347
1996
#ifdef __linux__
1349
1998
/* Restores kernel loglevel to default */
1350
1999
ret = klogctl(7, NULL, 0);
1351
2000
if(ret == -1){
1352
perror("klogctl");
2001
perror_plus("klogctl");
1353
2002
}
1354
2003
}
1355
2004
#endif /* __linux__ */
1356
2005
/* Lower privileges */
1357
2006
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
1370
2011
}
1371
2012
}
1372
2013
1376
2017
1377
2018
ret = init_gnutls_global(pubkey, seckey);
1378
2019
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
exitcode = EX_UNAVAILABLE;
1381
2022
goto end;
1382
2023
} else {
1383
2024
gnutls_initialized = true;
1387
2028
goto end;
1388
2029
}
1389
2030
2031
if(mkdtemp(tempdir) == NULL){
2032
perror_plus("mkdtemp");
2033
goto end;
2034
}
1390
2035
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
2036
1397
2037
if(quit_now){
1398
2038
goto end;
1399
2039
}
1400
2040
1401
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2043
exitcode = EX_UNAVAILABLE;
1404
2044
goto end;
1405
2045
} else {
1406
2046
gpgme_initialized = true;
1415
2055
/* (Mainly meant for debugging) */
1416
2056
char *address = strrchr(connect_to, ':');
1417
2057
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2058
fprintf_plus(stderr, "No colon in address\n");
2059
exitcode = EX_USAGE;
1420
2060
goto end;
1421
2061
}
1422
2062
1429
2069
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
2071
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2072
fprintf_plus(stderr, "Bad port number\n");
2073
exitcode = EX_USAGE;
1434
2074
goto end;
1435
2075
}
1436
2076
1440
2080
1441
2081
port = (uint16_t)tmpmax;
1442
2082
*address = '\0';
1443
address = connect_to;
1444
2083
/* Colon in address indicates IPv6 */
1445
2084
int af;
1446
if(strchr(address, ':') != NULL){
2085
if(strchr(connect_to, ':') != NULL){
1447
2086
af = AF_INET6;
2087
/* Accept [] around IPv6 address - see RFC 5952 */
2088
if(connect_to[0] == '[' and address[-1] == ']')
2089
{
2090
connect_to++;
2091
address[-1] = '\0';
2092
}
1448
2093
} else {
1449
2094
af = AF_INET;
1450
2095
}
2096
address = connect_to;
1451
2097
1452
2098
if(quit_now){
1453
2099
goto end;
1454
2100
}
1455
2101
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2102
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2104
if(quit_now or ret == 0){
2105
break;
2106
}
2107
if(debug){
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
(int)retry_interval);
2110
}
2111
sleep((int)retry_interval);
2112
}
2113
2114
if (not quit_now){
1460
2115
exitcode = EXIT_SUCCESS;
1461
2116
}
2117
1462
2118
goto end;
1463
2119
}
1464
2120
1486
2142
1487
2143
/* Check if creating the Avahi server object succeeded */
1488
2144
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2147
exitcode = EX_UNAVAILABLE;
1492
2148
goto end;
1493
2149
}
1494
2150
1501
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
2158
NULL, 0, browse_callback, NULL);
1503
2159
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
avahi_strerror(avahi_server_errno(mc.server)));
2162
exitcode = EX_UNAVAILABLE;
1507
2163
goto end;
1508
2164
}
1509
2165
1514
2170
/* Run the main loop */
1515
2171
1516
2172
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2174
}
2175
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2178
if(debug){
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
(ret == 0) ? "successfully" : "with error");
2181
}
1521
2182
1522
2183
end:
1523
2184
1524
2185
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2187
}
1527
2188
1528
2189
/* Cleanup things */
1545
2206
gpgme_release(mc.ctx);
1546
2207
}
1547
2208
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
2209
/* Cleans up the circular linked list of Mandos servers the client
2210
has seen */
2211
if(mc.current_server != NULL){
2212
mc.current_server->prev->next = NULL;
2213
while(mc.current_server != NULL){
2214
server *next = mc.current_server->next;
2215
free(mc.current_server);
2216
mc.current_server = next;
2217
}
2218
}
2219
2220
/* Re-raise priviliges */
2221
{
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
1557
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
2236
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
1561
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
2241
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1565
2243
}
1566
2244
}
1567
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
2246
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
1577
2257
}
1578
2258
}
1579
2259
1580
/* Removes the temp directory used by GPGME */
2260
/* Removes the GPGME temp directory and all files inside */
1581
2261
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
2262
struct dirent **direntries = NULL;
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
alphasort);
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
1602
2269
char *fullname = NULL;
1603
2270
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2271
direntry->d_name);
1605
2272
if(ret < 0){
1606
perror("asprintf");
2273
perror_plus("asprintf");
1607
2274
continue;
1608
2275
}
1609
2276
ret = remove(fullname);
1610
2277
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2279
strerror(errno));
1613
2280
}
1614
2281
free(fullname);
1615
2282
}
1616
closedir(d);
2283
}
2284
2285
/* need to clean even if 0 because man page doesn't specify */
2286
free(direntries);
2287
if (numentries == -1){
2288
perror_plus("scandir");
1617
2289
}
1618
2290
ret = rmdir(tempdir);
1619
2291
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2292
perror_plus("rmdir");
1621
2293
}
1622
2294
}
1623
2295
1628
2300
&old_sigterm_action,
1629
2301
NULL));
1630
2302
if(ret == -1){
1631
perror("sigaction");
2303
perror_plus("sigaction");
1632
2304
}
1633
2305
do {
1634
2306
ret = raise(signal_received);
1635
2307
} while(ret != 0 and errno == EINTR);
1636
2308
if(ret != 0){
1637
perror("raise");
2309
perror_plus("raise");
1638
2310
abort();
1639
2311
}
1640
2312
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0