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» Revision
237.16.8
(compared to revision 237.2.123)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2011-11-14 20:11:42 UTC
- mto: (237.15.7 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111114201142-17zxc14jvonogwfx
* plugins.d/mandos-client.c (run_network_hooks): New.
(main): Run run_network_hooks() with "stop" and "start" at
appropriate places. Don't lower privileges permanently
prematurely.
(main): Run run_network_hooks() with "stop" and "start" at
appropriate places. Don't lower privileges permanently
prematurely.
- files added:
- DBUS-API
- debian/source
- 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() */
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 */
71
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
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() */
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() */
85
90
86
91
#ifdef __linux__
87
92
#include <sys/klog.h> /* klogctl() */
105
110
init_gnutls_session(),
106
111
GNUTLS_* */
107
112
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
110
115
111
116
/* GPGME */
112
117
#include <gpgme.h> /* All GPGME types, constants and
120
125
#define PATHDIR "/conf/conf.d/mandos"
121
126
#define SECKEY "seckey.txt"
122
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
129
124
130
bool debug = false;
125
131
static const char mandos_protocol_version[] = "1";
126
132
const char *argp_program_version = "mandos-client " VERSION;
127
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;
128
148
129
149
/* Used for passing in values through the Avahi callback functions */
130
150
typedef struct {
135
155
gnutls_dh_params_t dh_params;
136
156
const char *priority;
137
157
gpgme_ctx_t ctx;
158
server *current_server;
138
159
} mandos_context;
139
160
140
161
/* global context so signal handler can reach it*/
141
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
163
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
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
}
144
176
145
177
/*
146
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
148
180
* "buffer_length" is how much is already used.
149
181
*/
150
182
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
183
size_t buffer_capacity){
152
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
186
if(buffer == NULL){
159
191
return buffer_capacity;
160
192
}
161
193
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
162
231
/*
163
232
* Initialize GPGME.
164
233
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
168
236
gpgme_error_t rc;
169
237
gpgme_engine_info_t engine_info;
170
238
173
241
* Helper function to insert pub and seckey to the engine keyring.
174
242
*/
175
243
bool import_key(const char *filename){
244
int ret;
176
245
int fd;
177
246
gpgme_data_t pgp_data;
178
247
179
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
249
if(fd == -1){
181
perror("open");
250
perror_plus("open");
182
251
return false;
183
252
}
184
253
185
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
255
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
188
258
gpgme_strsource(rc), gpgme_strerror(rc));
189
259
return false;
190
260
}
191
261
192
262
rc = gpgme_op_import(mc.ctx, pgp_data);
193
263
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
195
266
gpgme_strsource(rc), gpgme_strerror(rc));
196
267
return false;
197
268
}
198
269
199
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
271
if(ret == -1){
201
perror("close");
272
perror_plus("close");
202
273
}
203
274
gpgme_data_release(pgp_data);
204
275
return true;
205
276
}
206
277
207
278
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
209
281
}
210
282
211
283
/* Init GPGME */
212
284
gpgme_check_version(NULL);
213
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
286
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
216
289
gpgme_strsource(rc), gpgme_strerror(rc));
217
290
return false;
218
291
}
219
292
220
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
221
294
rc = gpgme_get_engine_info(&engine_info);
222
295
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
224
298
gpgme_strsource(rc), gpgme_strerror(rc));
225
299
return false;
226
300
}
233
307
engine_info = engine_info->next;
234
308
}
235
309
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
237
312
return false;
238
313
}
239
314
240
315
/* Create new GPGME "context" */
241
316
rc = gpgme_new(&(mc.ctx));
242
317
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
245
321
return false;
246
322
}
247
323
266
342
ssize_t plaintext_length = 0;
267
343
268
344
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
270
347
}
271
348
272
349
/* Create new GPGME data buffer from memory cryptotext */
273
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
351
0);
275
352
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
277
355
gpgme_strsource(rc), gpgme_strerror(rc));
278
356
return -1;
279
357
}
281
359
/* Create new empty GPGME data buffer for the plaintext */
282
360
rc = gpgme_data_new(&dh_plain);
283
361
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
285
364
gpgme_strsource(rc), gpgme_strerror(rc));
286
365
gpgme_data_release(dh_crypto);
287
366
return -1;
291
370
data buffer */
292
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
372
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
295
375
gpgme_strsource(rc), gpgme_strerror(rc));
296
376
plaintext_length = -1;
297
377
if(debug){
298
378
gpgme_decrypt_result_t result;
299
379
result = gpgme_op_decrypt_result(mc.ctx);
300
380
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
302
383
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
304
386
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
306
389
result->wrong_key_usage);
307
390
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
309
393
}
310
394
gpgme_recipient_t recipient;
311
395
recipient = result->recipients;
312
396
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
314
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
317
404
recipient->status == GPG_ERR_NO_SECKEY
318
405
? "No" : "Yes");
319
406
recipient = recipient->next;
324
411
}
325
412
326
413
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
328
416
}
329
417
330
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
333
421
plaintext_length = -1;
334
422
goto decrypt_end;
335
423
}
337
425
*plaintext = NULL;
338
426
while(true){
339
427
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
342
430
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
346
434
}
347
435
348
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
441
break;
354
442
}
355
443
if(ret < 0){
356
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
357
445
plaintext_length = -1;
358
446
goto decrypt_end;
359
447
}
361
449
}
362
450
363
451
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
365
454
for(ssize_t i = 0; i < plaintext_length; i++){
366
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
456
}
389
478
/* GnuTLS log function callback */
390
479
static void debuggnutls(__attribute__((unused)) int level,
391
480
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
393
482
}
394
483
395
484
static int init_gnutls_global(const char *pubkeyfilename,
397
486
int ret;
398
487
399
488
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
401
491
}
402
492
403
493
ret = gnutls_global_init();
404
494
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
497
return -1;
408
498
}
409
499
416
506
}
417
507
418
508
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
420
510
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
513
gnutls_global_deinit();
427
514
return -1;
428
515
}
429
516
430
517
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
432
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
521
seckeyfilename);
434
522
}
438
526
GNUTLS_OPENPGP_FMT_BASE64);
439
527
if(ret != GNUTLS_E_SUCCESS){
440
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
441
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
534
goto globalfail;
446
535
}
447
536
448
537
/* GnuTLS server initialization */
449
538
ret = gnutls_dh_params_init(&mc.dh_params);
450
539
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
452
542
" %s\n", safer_gnutls_strerror(ret));
453
543
goto globalfail;
454
544
}
455
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
546
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
458
549
safer_gnutls_strerror(ret));
459
550
goto globalfail;
460
551
}
474
565
static int init_gnutls_session(gnutls_session_t *session){
475
566
int ret;
476
567
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
574
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
480
577
safer_gnutls_strerror(ret));
481
578
}
482
579
483
580
{
484
581
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
589
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
490
594
gnutls_deinit(*session);
491
595
return -1;
492
596
}
493
597
}
494
598
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
607
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
499
610
safer_gnutls_strerror(ret));
500
611
gnutls_deinit(*session);
501
612
return -1;
502
613
}
503
614
504
615
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
617
508
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
509
619
514
624
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
625
__attribute__((unused)) const char *txt){}
516
626
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
627
/* Called when a Mandos server is found */
521
628
static int start_mandos_communication(const char *ip, uint16_t port,
522
629
AvahiIfIndex if_index,
528
635
struct sockaddr_in6 in6;
529
636
} to;
530
637
char *buffer = NULL;
531
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
532
639
size_t buffer_length = 0;
533
640
size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
535
641
size_t written;
536
int retval = 0;
642
int retval = -1;
537
643
gnutls_session_t session;
538
644
int pf; /* Protocol family */
539
645
646
errno = 0;
647
540
648
if(quit_now){
649
errno = EINTR;
541
650
return -1;
542
651
}
543
652
549
658
pf = PF_INET;
550
659
break;
551
660
default:
552
fprintf(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
553
664
return -1;
554
665
}
555
666
559
670
}
560
671
561
672
if(debug){
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
563
675
"\n", ip, port);
564
676
}
565
677
566
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
567
679
if(tcp_sd < 0){
568
perror("socket");
569
retval = -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
570
683
goto mandos_end;
571
684
}
572
685
573
686
if(quit_now){
687
errno = EINTR;
574
688
goto mandos_end;
575
689
}
576
690
583
697
ret = inet_pton(af, ip, &to.in.sin_addr);
584
698
}
585
699
if(ret < 0 ){
586
perror("inet_pton");
587
retval = -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
588
703
goto mandos_end;
589
704
}
590
705
if(ret == 0){
591
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
593
710
goto mandos_end;
594
711
}
595
712
if(af == AF_INET6){
599
716
600
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
602
-Wunreachable-code*/
719
-Wunreachable-code*/
603
720
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
605
723
" without a network interface\n");
606
retval = -1;
724
errno = EINVAL;
607
725
goto mandos_end;
608
726
}
609
727
/* Set the network interface number as scope */
616
734
}
617
735
618
736
if(quit_now){
737
errno = EINTR;
619
738
goto mandos_end;
620
739
}
621
740
623
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
743
char interface[IF_NAMESIZE];
625
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
745
perror_plus("if_indextoname");
627
746
} else {
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
629
749
ip, interface, port);
630
750
}
631
751
} else {
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
634
754
}
635
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
643
763
sizeof(addrstr));
644
764
}
645
765
if(pcret == NULL){
646
perror("inet_ntop");
766
perror_plus("inet_ntop");
647
767
} else {
648
768
if(strcmp(addrstr, ip) != 0){
649
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
650
771
}
651
772
}
652
773
}
653
774
654
775
if(quit_now){
776
errno = EINTR;
655
777
goto mandos_end;
656
778
}
657
779
661
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
662
784
}
663
785
if(ret < 0){
664
perror("connect");
665
retval = -1;
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
666
791
goto mandos_end;
667
792
}
668
793
669
794
if(quit_now){
795
errno = EINTR;
670
796
goto mandos_end;
671
797
}
672
798
675
801
while(true){
676
802
size_t out_size = strlen(out);
677
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
678
out_size - written));
804
out_size - written));
679
805
if(ret == -1){
680
perror("write");
681
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
682
809
goto mandos_end;
683
810
}
684
811
written += (size_t)ret;
694
821
}
695
822
696
823
if(quit_now){
824
errno = EINTR;
697
825
goto mandos_end;
698
826
}
699
827
}
700
828
701
829
if(debug){
702
fprintf(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
703
832
}
704
833
705
834
if(quit_now){
835
errno = EINTR;
706
836
goto mandos_end;
707
837
}
708
838
839
/* Spurious warning from -Wint-to-pointer-cast */
709
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
710
841
711
842
if(quit_now){
843
errno = EINTR;
712
844
goto mandos_end;
713
845
}
714
846
715
do{
847
do {
716
848
ret = gnutls_handshake(session);
717
849
if(quit_now){
850
errno = EINTR;
718
851
goto mandos_end;
719
852
}
720
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
854
722
855
if(ret != GNUTLS_E_SUCCESS){
723
856
if(debug){
724
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
725
859
gnutls_perror(ret);
726
860
}
727
retval = -1;
861
errno = EPROTO;
728
862
goto mandos_end;
729
863
}
730
864
731
865
/* Read OpenPGP packet that contains the wanted password */
732
866
733
867
if(debug){
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
735
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
736
870
}
737
871
738
872
while(true){
739
873
740
874
if(quit_now){
875
errno = EINTR;
741
876
goto mandos_end;
742
877
}
743
878
744
879
buffer_capacity = incbuffer(&buffer, buffer_length,
745
buffer_capacity);
880
buffer_capacity);
746
881
if(buffer_capacity == 0){
747
perror("incbuffer");
748
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
749
885
goto mandos_end;
750
886
}
751
887
752
888
if(quit_now){
889
errno = EINTR;
753
890
goto mandos_end;
754
891
}
755
892
764
901
case GNUTLS_E_AGAIN:
765
902
break;
766
903
case GNUTLS_E_REHANDSHAKE:
767
do{
904
do {
768
905
ret = gnutls_handshake(session);
769
906
770
907
if(quit_now){
908
errno = EINTR;
771
909
goto mandos_end;
772
910
}
773
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
774
912
if(ret < 0){
775
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
776
915
gnutls_perror(ret);
777
retval = -1;
916
errno = EPROTO;
778
917
goto mandos_end;
779
918
}
780
919
break;
781
920
default:
782
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
783
923
" encrypted session with Mandos server\n");
784
retval = -1;
785
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
786
926
goto mandos_end;
787
927
}
788
928
} else {
791
931
}
792
932
793
933
if(debug){
794
fprintf(stderr, "Closing TLS session\n");
795
}
796
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
806
950
807
951
if(buffer_length > 0){
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
810
954
&decrypted_buffer);
811
955
if(decrypted_buffer_size >= 0){
956
812
957
written = 0;
813
958
while(written < (size_t) decrypted_buffer_size){
814
959
if(quit_now){
960
errno = EINTR;
815
961
goto mandos_end;
816
962
}
817
963
819
965
(size_t)decrypted_buffer_size - written,
820
966
stdout);
821
967
if(ret == 0 and ferror(stdout)){
968
int e = errno;
822
969
if(debug){
823
fprintf(stderr, "Error writing encrypted data: %s\n",
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
824
972
strerror(errno));
825
973
}
826
retval = -1;
827
break;
974
errno = e;
975
goto mandos_end;
828
976
}
829
977
written += (size_t)ret;
830
978
}
831
free(decrypted_buffer);
832
} else {
833
retval = -1;
979
retval = 0;
834
980
}
835
} else {
836
retval = -1;
837
981
}
838
982
839
983
/* Shutdown procedure */
840
984
841
985
mandos_end:
842
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
846
if(ret == -1){
847
perror("close");
848
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
852
1005
}
853
1006
return retval;
854
1007
}
879
1032
switch(event){
880
1033
default:
881
1034
case AVAHI_RESOLVER_FAILURE:
882
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
883
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
884
1038
avahi_strerror(avahi_server_errno(mc.server)));
885
1039
break;
889
1043
char ip[AVAHI_ADDRESS_STR_MAX];
890
1044
avahi_address_snprint(ip, sizeof(ip), address);
891
1045
if(debug){
892
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
893
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
1049
ip, (intmax_t)interface, port);
895
1050
}
897
1052
avahi_proto_to_af(proto));
898
1053
if(ret == 0){
899
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
900
1058
}
901
1059
}
902
1060
}
926
1084
default:
927
1085
case AVAHI_BROWSER_FAILURE:
928
1086
929
fprintf(stderr, "(Avahi browser) %s\n",
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
930
1089
avahi_strerror(avahi_server_errno(mc.server)));
931
1090
avahi_simple_poll_quit(mc.simple_poll);
932
1091
return;
940
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
1100
name, type, domain, protocol, 0,
942
1101
resolve_callback, NULL) == NULL)
943
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
944
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
945
1105
break;
946
1106
950
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
951
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
952
1112
if(debug){
953
fprintf(stderr, "No Mandos server found, still searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
954
1115
}
955
1116
break;
956
1117
}
957
1118
}
958
1119
959
/* stop main loop after sigterm has been called */
1120
/* Signal handler that stops main loop after SIGTERM */
960
1121
static void handle_sigterm(int sig){
961
1122
if(quit_now){
962
1123
return;
964
1125
quit_now = 1;
965
1126
signal_received = sig;
966
1127
int old_errno = errno;
1128
/* set main loop to exit */
967
1129
if(mc.simple_poll != NULL){
968
1130
avahi_simple_poll_quit(mc.simple_poll);
969
1131
}
970
1132
errno = old_errno;
971
1133
}
972
1134
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
1413
bool run_network_hooks(const char *mode, const char *interface,
1414
const float delay){
1415
struct dirent **direntries;
1416
struct dirent *direntry;
1417
int ret;
1418
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1419
alphasort);
1420
if(numhooks == -1){
1421
perror_plus("scandir");
1422
} else {
1423
int devnull = open("/dev/null", O_RDONLY);
1424
for(int i = 0; i < numhooks; i++){
1425
direntry = direntries[0];
1426
char *fullname = NULL;
1427
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1428
if(ret < 0){
1429
perror_plus("asprintf");
1430
continue;
1431
}
1432
pid_t hook_pid = fork();
1433
if(hook_pid == 0){
1434
/* Child */
1435
dup2(devnull, STDIN_FILENO);
1436
close(devnull);
1437
dup2(STDERR_FILENO, STDOUT_FILENO);
1438
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
if(ret == -1){
1440
perror_plus("setenv");
1441
return false;
1442
}
1443
ret = setenv("DEVICE", interface, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
return false;
1447
}
1448
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
return false;
1452
}
1453
ret = setenv("MODE", mode, 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
return false;
1457
}
1458
char *delaystring;
1459
ret = asprintf(&delaystring, "%f", delay);
1460
if(ret == -1){
1461
perror_plus("asprintf");
1462
return false;
1463
}
1464
ret = setenv("DELAY", delaystring, 1);
1465
if(ret == -1){
1466
free(delaystring);
1467
perror_plus("setenv");
1468
return false;
1469
}
1470
free(delaystring);
1471
ret = execl(fullname, direntry->d_name, mode, NULL);
1472
perror_plus("execl");
1473
} else {
1474
int status;
1475
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1476
perror_plus("waitpid");
1477
free(fullname);
1478
continue;
1479
}
1480
if(WIFEXITED(status)){
1481
if(WEXITSTATUS(status) != 0){
1482
fprintf(stderr, "Mandos plugin mandos-client: "
1483
"Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf(stderr, "Mandos plugin mandos-client: "
1491
"Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf(stderr, "Mandos plugin mandos-client: "
1498
"Warning: network hook \"%s\" crashed\n",
1499
direntry->d_name);
1500
free(fullname);
1501
continue;
1502
}
1503
}
1504
free(fullname);
1505
if(quit_now){
1506
break;
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
1513
973
1514
int main(int argc, char *argv[]){
974
1515
AvahiSServiceBrowser *sb = NULL;
975
1516
int error;
977
1518
intmax_t tmpmax;
978
1519
char *tmp;
979
1520
int exitcode = EXIT_SUCCESS;
980
const char *interface = "eth0";
1521
const char *interface = "";
981
1522
struct ifreq network;
982
1523
int sd = -1;
983
1524
bool take_down_interface = false;
984
1525
uid_t uid;
985
1526
gid_t gid;
986
char *connect_to = NULL;
987
1527
char tempdir[] = "/tmp/mandosXXXXXX";
988
1528
bool tempdir_created = false;
989
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
993
1533
bool gnutls_initialized = false;
994
1534
bool gpgme_initialized = false;
995
1535
float delay = 2.5f;
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
996
1538
997
struct sigaction old_sigterm_action;
1539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
1540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
999
1541
1542
uid = getuid();
1543
gid = getgid();
1544
1545
/* Lower any group privileges we might have, just to be safe */
1546
errno = 0;
1547
ret = setgid(gid);
1548
if(ret == -1){
1549
perror_plus("setgid");
1550
}
1551
1552
/* Lower user privileges (temporarily) */
1553
errno = 0;
1554
ret = seteuid(uid);
1555
if(ret == -1){
1556
perror_plus("seteuid");
1557
}
1558
1559
if(quit_now){
1560
goto end;
1561
}
1562
1000
1563
{
1001
1564
struct argp_option options[] = {
1002
1565
{ .name = "debug", .key = 128,
1031
1594
.arg = "SECONDS",
1032
1595
.doc = "Maximum delay to wait for interface startup",
1033
1596
.group = 2 },
1597
{ .name = "retry", .key = 132,
1598
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1605
/*
1606
* These reproduce what we would get without ARGP_NO_HELP
1607
*/
1608
{ .name = "help", .key = '?',
1609
.doc = "Give this help list", .group = -1 },
1610
{ .name = "usage", .key = -3,
1611
.doc = "Give a short usage message", .group = -1 },
1612
{ .name = "version", .key = 'V',
1613
.doc = "Print program version", .group = -1 },
1034
1614
{ .name = NULL }
1035
1615
};
1036
1616
1037
1617
error_t parse_opt(int key, char *arg,
1038
1618
struct argp_state *state){
1619
errno = 0;
1039
1620
switch(key){
1040
1621
case 128: /* --debug */
1041
1622
debug = true;
1057
1638
tmpmax = strtoimax(arg, &tmp, 10);
1058
1639
if(errno != 0 or tmp == arg or *tmp != '\0'
1059
1640
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1641
argp_error(state, "Bad number of DH bits");
1062
1642
}
1063
1643
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1064
1644
break;
1069
1649
errno = 0;
1070
1650
delay = strtof(arg, &tmp);
1071
1651
if(errno != 0 or tmp == arg or *tmp != '\0'){
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1074
}
1075
break;
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1652
argp_error(state, "Bad delay");
1653
}
1654
case 132: /* --retry */
1655
errno = 0;
1656
retry_interval = strtod(arg, &tmp);
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1660
argp_error(state, "Bad retry interval");
1661
}
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1666
/*
1667
* These reproduce what we would get without ARGP_NO_HELP
1668
*/
1669
case '?': /* --help */
1670
argp_state_help(state, state->out_stream,
1671
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1672
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1673
case -3: /* --usage */
1674
argp_state_help(state, state->out_stream,
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
case 'V': /* --version */
1677
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1678
fprintf(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
1079
1680
break;
1080
1681
default:
1081
1682
return ARGP_ERR_UNKNOWN;
1082
1683
}
1083
return 0;
1684
return errno;
1084
1685
}
1085
1686
1086
1687
struct argp argp = { .options = options, .parser = parse_opt,
1087
1688
.args_doc = "",
1088
1689
.doc = "Mandos client -- Get and decrypt"
1089
1690
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1693
switch(ret){
1694
case 0:
1695
break;
1696
case ENOMEM:
1697
default:
1698
errno = ret;
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1701
goto end;
1702
case EINVAL:
1703
exitcode = EX_USAGE;
1704
goto end;
1705
}
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
struct stat st;
1712
1713
/* Re-raise priviliges */
1714
errno = 0;
1715
ret = seteuid(0);
1716
if(ret == -1){
1717
perror_plus("seteuid");
1718
}
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
1768
/* Run network hooks */
1769
{
1770
/* Re-raise priviliges */
1771
errno = 0;
1772
ret = seteuid(0);
1773
if(ret == -1){
1774
perror_plus("seteuid");
1775
}
1776
if(not run_network_hooks("start", interface, delay)){
1777
goto end;
1778
}
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1095
1784
}
1096
1785
}
1097
1786
1099
1788
avahi_set_log_function(empty_log);
1100
1789
}
1101
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf(stderr, "Mandos plugin mandos-client: "
1807
"Using interface \"%s\"\n", interface);
1808
}
1809
if(interface == NULL){
1810
perror_plus("malloc");
1811
free(direntries);
1812
exitcode = EXIT_FAILURE;
1813
goto end;
1814
}
1815
free(direntries);
1816
} else {
1817
free(direntries);
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Could not find a network interface\n");
1820
exitcode = EXIT_FAILURE;
1821
goto end;
1822
}
1823
}
1824
1102
1825
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
1826
from the signal handler */
1104
1827
/* Initialize the pseudo-RNG for Avahi */
1105
1828
srand((unsigned int) time(NULL));
1106
1829
mc.simple_poll = avahi_simple_poll_new();
1107
1830
if(mc.simple_poll == NULL){
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1831
fprintf(stderr, "Mandos plugin mandos-client: "
1832
"Avahi: Failed to create simple poll object.\n");
1833
exitcode = EX_UNAVAILABLE;
1110
1834
goto end;
1111
1835
}
1112
1836
1113
1837
sigemptyset(&sigterm_action.sa_mask);
1114
1838
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1115
1839
if(ret == -1){
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1840
perror_plus("sigaddset");
1841
exitcode = EX_OSERR;
1118
1842
goto end;
1119
1843
}
1120
1844
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1121
1845
if(ret == -1){
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1846
perror_plus("sigaddset");
1847
exitcode = EX_OSERR;
1124
1848
goto end;
1125
1849
}
1126
1850
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1127
1851
if(ret == -1){
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1852
perror_plus("sigaddset");
1853
exitcode = EX_OSERR;
1130
1854
goto end;
1131
1855
}
1132
1856
/* Need to check if the handler is SIG_IGN before handling:
1135
1859
*/
1136
1860
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1137
1861
if(ret == -1){
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1140
1864
}
1141
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
1866
ret = sigaction(SIGINT, &sigterm_action, NULL);
1143
1867
if(ret == -1){
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1146
1870
goto end;
1147
1871
}
1148
1872
}
1149
1873
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1150
1874
if(ret == -1){
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1153
1877
}
1154
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
1879
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1156
1880
if(ret == -1){
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1159
1883
goto end;
1160
1884
}
1161
1885
}
1162
1886
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1163
1887
if(ret == -1){
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1888
perror_plus("sigaction");
1889
return EX_OSERR;
1166
1890
}
1167
1891
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
1892
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1169
1893
if(ret == -1){
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1894
perror_plus("sigaction");
1895
exitcode = EX_OSERR;
1172
1896
goto end;
1173
1897
}
1174
1898
}
1175
1899
1176
1900
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
1901
if(strcmp(interface, "none") != 0){
1178
1902
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
1903
if(if_index == 0){
1180
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1904
fprintf(stderr, "Mandos plugin mandos-client: "
1905
"No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1182
1907
goto end;
1183
1908
}
1184
1909
1186
1911
goto end;
1187
1912
}
1188
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1189
1921
#ifdef __linux__
1190
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1923
messages about the network interface to mess up the prompt */
1192
1924
ret = klogctl(8, NULL, 5);
1193
1925
bool restore_loglevel = true;
1194
1926
if(ret == -1){
1195
1927
restore_loglevel = false;
1196
perror("klogctl");
1928
perror_plus("klogctl");
1197
1929
}
1198
1930
#endif /* __linux__ */
1199
1931
1200
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
1933
if(sd < 0){
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1204
1936
#ifdef __linux__
1205
1937
if(restore_loglevel){
1206
1938
ret = klogctl(7, NULL, 0);
1207
1939
if(ret == -1){
1208
perror("klogctl");
1940
perror_plus("klogctl");
1209
1941
}
1210
1942
}
1211
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1212
1950
goto end;
1213
1951
}
1214
1952
strcpy(network.ifr_name, interface);
1215
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1216
1954
if(ret == -1){
1217
perror("ioctl SIOCGIFFLAGS");
1955
perror_plus("ioctl SIOCGIFFLAGS");
1218
1956
#ifdef __linux__
1219
1957
if(restore_loglevel){
1220
1958
ret = klogctl(7, NULL, 0);
1221
1959
if(ret == -1){
1222
perror("klogctl");
1960
perror_plus("klogctl");
1223
1961
}
1224
1962
}
1225
1963
#endif /* __linux__ */
1226
exitcode = EXIT_FAILURE;
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1227
1971
goto end;
1228
1972
}
1229
1973
if((network.ifr_flags & IFF_UP) == 0){
1232
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1233
1977
if(ret == -1){
1234
1978
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1237
1981
#ifdef __linux__
1238
1982
if(restore_loglevel){
1239
1983
ret = klogctl(7, NULL, 0);
1240
1984
if(ret == -1){
1241
perror("klogctl");
1985
perror_plus("klogctl");
1242
1986
}
1243
1987
}
1244
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1245
1995
goto end;
1246
1996
}
1247
1997
}
1248
/* sleep checking until interface is running */
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1249
2000
for(int i=0; i < delay * 4; i++){
1250
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1251
2002
if(ret == -1){
1252
perror("ioctl SIOCGIFFLAGS");
2003
perror_plus("ioctl SIOCGIFFLAGS");
1253
2004
} else if(network.ifr_flags & IFF_RUNNING){
1254
2005
break;
1255
2006
}
1256
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
1257
2008
ret = nanosleep(&sleeptime, NULL);
1258
2009
if(ret == -1 and errno != EINTR){
1259
perror("nanosleep");
2010
perror_plus("nanosleep");
1260
2011
}
1261
2012
}
1262
2013
if(not take_down_interface){
1263
2014
/* We won't need the socket anymore */
1264
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1265
2016
if(ret == -1){
1266
perror("close");
2017
perror_plus("close");
1267
2018
}
1268
2019
}
1269
2020
#ifdef __linux__
1271
2022
/* Restores kernel loglevel to default */
1272
2023
ret = klogctl(7, NULL, 0);
1273
2024
if(ret == -1){
1274
perror("klogctl");
2025
perror_plus("klogctl");
1275
2026
}
1276
2027
}
1277
2028
#endif /* __linux__ */
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
1296
2036
}
1297
2037
1298
2038
if(quit_now){
1301
2041
1302
2042
ret = init_gnutls_global(pubkey, seckey);
1303
2043
if(ret == -1){
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
2044
fprintf(stderr, "Mandos plugin mandos-client: "
2045
"init_gnutls_global failed\n");
2046
exitcode = EX_UNAVAILABLE;
1306
2047
goto end;
1307
2048
} else {
1308
2049
gnutls_initialized = true;
1312
2053
goto end;
1313
2054
}
1314
2055
2056
if(mkdtemp(tempdir) == NULL){
2057
perror_plus("mkdtemp");
2058
goto end;
2059
}
1315
2060
tempdir_created = true;
1316
if(mkdtemp(tempdir) == NULL){
1317
tempdir_created = false;
1318
perror("mkdtemp");
1319
goto end;
1320
}
1321
2061
1322
2062
if(quit_now){
1323
2063
goto end;
1324
2064
}
1325
2065
1326
2066
if(not init_gpgme(pubkey, seckey, tempdir)){
1327
fprintf(stderr, "init_gpgme failed\n");
1328
exitcode = EXIT_FAILURE;
2067
fprintf(stderr, "Mandos plugin mandos-client: "
2068
"init_gpgme failed\n");
2069
exitcode = EX_UNAVAILABLE;
1329
2070
goto end;
1330
2071
} else {
1331
2072
gpgme_initialized = true;
1340
2081
/* (Mainly meant for debugging) */
1341
2082
char *address = strrchr(connect_to, ':');
1342
2083
if(address == NULL){
1343
fprintf(stderr, "No colon in address\n");
1344
exitcode = EXIT_FAILURE;
2084
fprintf(stderr, "Mandos plugin mandos-client: "
2085
"No colon in address\n");
2086
exitcode = EX_USAGE;
1345
2087
goto end;
1346
2088
}
1347
2089
1354
2096
tmpmax = strtoimax(address+1, &tmp, 10);
1355
2097
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1356
2098
or tmpmax != (uint16_t)tmpmax){
1357
fprintf(stderr, "Bad port number\n");
1358
exitcode = EXIT_FAILURE;
2099
fprintf(stderr, "Mandos plugin mandos-client: "
2100
"Bad port number\n");
2101
exitcode = EX_USAGE;
1359
2102
goto end;
1360
2103
}
1361
2104
1365
2108
1366
2109
port = (uint16_t)tmpmax;
1367
2110
*address = '\0';
1368
address = connect_to;
1369
2111
/* Colon in address indicates IPv6 */
1370
2112
int af;
1371
if(strchr(address, ':') != NULL){
2113
if(strchr(connect_to, ':') != NULL){
1372
2114
af = AF_INET6;
2115
/* Accept [] around IPv6 address - see RFC 5952 */
2116
if(connect_to[0] == '[' and address[-1] == ']')
2117
{
2118
connect_to++;
2119
address[-1] = '\0';
2120
}
1373
2121
} else {
1374
2122
af = AF_INET;
1375
2123
}
2124
address = connect_to;
1376
2125
1377
2126
if(quit_now){
1378
2127
goto end;
1379
2128
}
1380
2129
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
2130
while(not quit_now){
2131
ret = start_mandos_communication(address, port, if_index, af);
2132
if(quit_now or ret == 0){
2133
break;
2134
}
2135
if(debug){
2136
fprintf(stderr, "Mandos plugin mandos-client: "
2137
"Retrying in %d seconds\n", (int)retry_interval);
2138
}
2139
sleep((int)retry_interval);
2140
}
2141
2142
if (not quit_now){
1385
2143
exitcode = EXIT_SUCCESS;
1386
2144
}
2145
1387
2146
goto end;
1388
2147
}
1389
2148
1411
2170
1412
2171
/* Check if creating the Avahi server object succeeded */
1413
2172
if(mc.server == NULL){
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
2173
fprintf(stderr, "Mandos plugin mandos-client: "
2174
"Failed to create Avahi server: %s\n",
1415
2175
avahi_strerror(error));
1416
exitcode = EXIT_FAILURE;
2176
exitcode = EX_UNAVAILABLE;
1417
2177
goto end;
1418
2178
}
1419
2179
1426
2186
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1427
2187
NULL, 0, browse_callback, NULL);
1428
2188
if(sb == NULL){
1429
fprintf(stderr, "Failed to create service browser: %s\n",
2189
fprintf(stderr, "Mandos plugin mandos-client: "
2190
"Failed to create service browser: %s\n",
1430
2191
avahi_strerror(avahi_server_errno(mc.server)));
1431
exitcode = EXIT_FAILURE;
2192
exitcode = EX_UNAVAILABLE;
1432
2193
goto end;
1433
2194
}
1434
2195
1439
2200
/* Run the main loop */
1440
2201
1441
2202
if(debug){
1442
fprintf(stderr, "Starting Avahi loop search\n");
1443
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
2203
fprintf(stderr, "Mandos plugin mandos-client: "
2204
"Starting Avahi loop search\n");
2205
}
2206
2207
ret = avahi_loop_with_timeout(mc.simple_poll,
2208
(int)(retry_interval * 1000));
2209
if(debug){
2210
fprintf(stderr, "Mandos plugin mandos-client: "
2211
"avahi_loop_with_timeout exited %s\n",
2212
(ret == 0) ? "successfully" : "with error");
2213
}
1446
2214
1447
2215
end:
1448
2216
1449
2217
if(debug){
1450
fprintf(stderr, "%s exiting\n", argv[0]);
2218
fprintf(stderr, "Mandos plugin mandos-client: "
2219
"%s exiting\n", argv[0]);
1451
2220
}
1452
2221
1453
2222
/* Cleanup things */
1469
2238
if(gpgme_initialized){
1470
2239
gpgme_release(mc.ctx);
1471
2240
}
1472
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1476
if(ret == -1){
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1484
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
1488
}
1489
}
1490
1491
/* Removes the temp directory used by GPGME */
2241
2242
/* Cleans up the circular linked list of Mandos servers the client
2243
has seen */
2244
if(mc.current_server != NULL){
2245
mc.current_server->prev->next = NULL;
2246
while(mc.current_server != NULL){
2247
server *next = mc.current_server->next;
2248
free(mc.current_server);
2249
mc.current_server = next;
2250
}
2251
}
2252
2253
/* Re-raise priviliges */
2254
{
2255
errno = 0;
2256
ret = seteuid(0);
2257
if(ret == -1){
2258
perror_plus("seteuid");
2259
}
2260
/* Run network hooks */
2261
if(not run_network_hooks("stop", interface, delay)){
2262
goto end;
2263
}
2264
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2268
if(ret == -1){
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2273
if(ret == -1){
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
}
2276
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2280
}
2281
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2289
2290
/* Removes the GPGME temp directory and all files inside */
1492
2291
if(tempdir_created){
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
1498
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
2292
struct dirent **direntries = NULL;
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2295
alphasort);
2296
if (numentries > 0){
2297
for(int i = 0; i < numentries; i++){
2298
direntry = direntries[i];
1513
2299
char *fullname = NULL;
1514
2300
ret = asprintf(&fullname, "%s/%s", tempdir,
1515
2301
direntry->d_name);
1516
2302
if(ret < 0){
1517
perror("asprintf");
2303
perror_plus("asprintf");
1518
2304
continue;
1519
2305
}
1520
2306
ret = remove(fullname);
1521
2307
if(ret == -1){
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1523
strerror(errno));
2308
fprintf(stderr, "Mandos plugin mandos-client: "
2309
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1524
2310
}
1525
2311
free(fullname);
1526
2312
}
1527
closedir(d);
2313
}
2314
2315
/* need to clean even if 0 because man page doesn't specify */
2316
free(direntries);
2317
if (numentries == -1){
2318
perror_plus("scandir");
1528
2319
}
1529
2320
ret = rmdir(tempdir);
1530
2321
if(ret == -1 and errno != ENOENT){
1531
perror("rmdir");
2322
perror_plus("rmdir");
1532
2323
}
1533
2324
}
1534
2325
1535
2326
if(quit_now){
1536
2327
sigemptyset(&old_sigterm_action.sa_mask);
1537
2328
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2329
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2330
&old_sigterm_action,
2331
NULL));
1539
2332
if(ret == -1){
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
2333
perror_plus("sigaction");
2334
}
2335
do {
2336
ret = raise(signal_received);
2337
} while(ret != 0 and errno == EINTR);
2338
if(ret != 0){
2339
perror_plus("raise");
2340
abort();
2341
}
2342
TEMP_FAILURE_RETRY(pause());
1543
2343
}
1544
2344
1545
2345
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0