To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.3.5
- compare with another revision
- download diff
- download tarball
- view history from revision 505.3.5
- Committer: teddy at bsnet
- Date: 2011-11-12 18:04:35 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111112180435-kdui7a6o7jfpgz9r
* plugins.d/mandos-client.c (SYNOPSIS, OPTIONS): Document
"--network-hook-dir"
option.
"--network-hook-dir"
option.
- 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() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
39
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
49
53
sockaddr_in6, PF_INET6,
50
54
SOCK_STREAM, uid_t, gid_t, open(),
51
55
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
58
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
83
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
84
sigaction(), SIGTERM, sig_atomic_t,
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() */
81
90
82
91
#ifdef __linux__
83
92
#include <sys/klog.h> /* klogctl() */
116
125
#define PATHDIR "/conf/conf.d/mandos"
117
126
#define SECKEY "seckey.txt"
118
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
119
129
120
130
bool debug = false;
121
131
static const char mandos_protocol_version[] = "1";
122
132
const char *argp_program_version = "mandos-client " VERSION;
123
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;
124
148
125
149
/* Used for passing in values through the Avahi callback functions */
126
150
typedef struct {
131
155
gnutls_dh_params_t dh_params;
132
156
const char *priority;
133
157
gpgme_ctx_t ctx;
158
server *current_server;
134
159
} mandos_context;
135
160
136
161
/* global context so signal handler can reach it*/
137
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
163
.dh_bits = 1024, .priority = "SECURE256"
139
":!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
}
140
176
141
177
/*
142
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
155
191
return buffer_capacity;
156
192
}
157
193
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
158
232
/*
159
233
* Initialize GPGME.
160
234
*/
161
235
static bool init_gpgme(const char *seckey,
162
236
const char *pubkey, const char *tempdir){
163
int ret;
164
237
gpgme_error_t rc;
165
238
gpgme_engine_info_t engine_info;
166
239
169
242
* Helper function to insert pub and seckey to the engine keyring.
170
243
*/
171
244
bool import_key(const char *filename){
245
int ret;
172
246
int fd;
173
247
gpgme_data_t pgp_data;
174
248
175
249
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
250
if(fd == -1){
177
perror("open");
251
perror_plus("open");
178
252
return false;
179
253
}
180
254
181
255
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
256
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
184
259
gpgme_strsource(rc), gpgme_strerror(rc));
185
260
return false;
186
261
}
187
262
188
263
rc = gpgme_op_import(mc.ctx, pgp_data);
189
264
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
191
267
gpgme_strsource(rc), gpgme_strerror(rc));
192
268
return false;
193
269
}
194
270
195
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
272
if(ret == -1){
197
perror("close");
273
perror_plus("close");
198
274
}
199
275
gpgme_data_release(pgp_data);
200
276
return true;
201
277
}
202
278
203
279
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
205
282
}
206
283
207
284
/* Init GPGME */
208
285
gpgme_check_version(NULL);
209
286
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
287
if(rc != GPG_ERR_NO_ERROR){
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
212
290
gpgme_strsource(rc), gpgme_strerror(rc));
213
291
return false;
214
292
}
215
293
216
/* Set GPGME home directory for the OpenPGP engine only */
294
/* Set GPGME home directory for the OpenPGP engine only */
217
295
rc = gpgme_get_engine_info(&engine_info);
218
296
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
220
299
gpgme_strsource(rc), gpgme_strerror(rc));
221
300
return false;
222
301
}
229
308
engine_info = engine_info->next;
230
309
}
231
310
if(engine_info == NULL){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
233
313
return false;
234
314
}
235
315
236
316
/* Create new GPGME "context" */
237
317
rc = gpgme_new(&(mc.ctx));
238
318
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
241
322
return false;
242
323
}
243
324
245
326
return false;
246
327
}
247
328
248
return true;
329
return true;
249
330
}
250
331
251
332
/*
262
343
ssize_t plaintext_length = 0;
263
344
264
345
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
266
348
}
267
349
268
350
/* Create new GPGME data buffer from memory cryptotext */
269
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
352
0);
271
353
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
273
356
gpgme_strsource(rc), gpgme_strerror(rc));
274
357
return -1;
275
358
}
277
360
/* Create new empty GPGME data buffer for the plaintext */
278
361
rc = gpgme_data_new(&dh_plain);
279
362
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
281
365
gpgme_strsource(rc), gpgme_strerror(rc));
282
366
gpgme_data_release(dh_crypto);
283
367
return -1;
287
371
data buffer */
288
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
373
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
291
376
gpgme_strsource(rc), gpgme_strerror(rc));
292
377
plaintext_length = -1;
293
378
if(debug){
294
379
gpgme_decrypt_result_t result;
295
380
result = gpgme_op_decrypt_result(mc.ctx);
296
381
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
298
384
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
300
387
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
302
390
result->wrong_key_usage);
303
391
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
305
394
}
306
395
gpgme_recipient_t recipient;
307
396
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
318
408
}
319
409
}
320
410
}
322
412
}
323
413
324
414
if(debug){
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
326
417
}
327
418
328
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
421
perror_plus("gpgme_data_seek");
331
422
plaintext_length = -1;
332
423
goto decrypt_end;
333
424
}
338
429
(size_t)plaintext_length,
339
430
plaintext_capacity);
340
431
if(plaintext_capacity == 0){
341
perror("incbuffer");
432
perror_plus("incbuffer");
342
433
plaintext_length = -1;
343
434
goto decrypt_end;
344
435
}
351
442
break;
352
443
}
353
444
if(ret < 0){
354
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
355
446
plaintext_length = -1;
356
447
goto decrypt_end;
357
448
}
359
450
}
360
451
361
452
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
363
455
for(ssize_t i = 0; i < plaintext_length; i++){
364
456
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
457
}
387
479
/* GnuTLS log function callback */
388
480
static void debuggnutls(__attribute__((unused)) int level,
389
481
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
391
483
}
392
484
393
485
static int init_gnutls_global(const char *pubkeyfilename,
395
487
int ret;
396
488
397
489
if(debug){
398
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
399
492
}
400
493
401
494
ret = gnutls_global_init();
402
495
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
405
498
return -1;
406
499
}
407
500
414
507
}
415
508
416
509
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
418
511
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
424
514
gnutls_global_deinit();
425
515
return -1;
426
516
}
427
517
428
518
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
430
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
522
seckeyfilename);
432
523
}
436
527
GNUTLS_OPENPGP_FMT_BASE64);
437
528
if(ret != GNUTLS_E_SUCCESS){
438
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
439
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
443
535
goto globalfail;
444
536
}
445
537
446
538
/* GnuTLS server initialization */
447
539
ret = gnutls_dh_params_init(&mc.dh_params);
448
540
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
450
543
" %s\n", safer_gnutls_strerror(ret));
451
544
goto globalfail;
452
545
}
453
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
547
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
456
550
safer_gnutls_strerror(ret));
457
551
goto globalfail;
458
552
}
472
566
static int init_gnutls_session(gnutls_session_t *session){
473
567
int ret;
474
568
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
575
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
478
578
safer_gnutls_strerror(ret));
479
579
}
480
580
481
581
{
482
582
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
590
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
488
595
gnutls_deinit(*session);
489
596
return -1;
490
597
}
491
598
}
492
599
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
608
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
497
611
safer_gnutls_strerror(ret));
498
612
gnutls_deinit(*session);
499
613
return -1;
500
614
}
501
615
502
616
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
618
506
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
620
516
629
static int start_mandos_communication(const char *ip, uint16_t port,
517
630
AvahiIfIndex if_index,
518
631
int af){
519
int ret, tcp_sd;
632
int ret, tcp_sd = -1;
520
633
ssize_t sret;
521
634
union {
522
635
struct sockaddr_in in;
523
636
struct sockaddr_in6 in6;
524
637
} to;
525
638
char *buffer = NULL;
526
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
527
640
size_t buffer_length = 0;
528
641
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
642
size_t written;
531
int retval = 0;
643
int retval = -1;
532
644
gnutls_session_t session;
533
645
int pf; /* Protocol family */
534
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
535
654
switch(af){
536
655
case AF_INET6:
537
656
pf = PF_INET6;
540
659
pf = PF_INET;
541
660
break;
542
661
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
544
665
return -1;
545
666
}
546
667
550
671
}
551
672
552
673
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
554
676
"\n", ip, port);
555
677
}
556
678
557
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
680
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
errno = EINTR;
689
goto mandos_end;
561
690
}
562
691
563
692
memset(&to, 0, sizeof(to));
564
693
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
694
to.in6.sin6_family = (sa_family_t)af;
566
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
696
} else { /* IPv4 */
568
697
to.in.sin_family = (sa_family_t)af;
569
698
ret = inet_pton(af, ip, &to.in.sin_addr);
570
699
}
571
700
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
704
goto mandos_end;
574
705
}
575
706
if(ret == 0){
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
711
goto mandos_end;
578
712
}
579
713
if(af == AF_INET6){
580
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
720
-Wunreachable-code*/
587
721
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
589
724
" without a network interface\n");
590
return -1;
725
errno = EINVAL;
726
goto mandos_end;
591
727
}
592
728
/* Set the network interface number as scope */
593
729
to.in6.sin6_scope_id = (uint32_t)if_index;
598
734
-Wunreachable-code */
599
735
}
600
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
601
742
if(debug){
602
743
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
744
char interface[IF_NAMESIZE];
604
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
746
perror_plus("if_indextoname");
606
747
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
608
750
ip, interface, port);
609
751
}
610
752
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
613
755
}
614
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
764
sizeof(addrstr));
623
765
}
624
766
if(pcret == NULL){
625
perror("inet_ntop");
767
perror_plus("inet_ntop");
626
768
} else {
627
769
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
629
772
}
630
773
}
631
774
}
632
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
633
781
if(af == AF_INET6){
634
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
783
} else {
636
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
785
}
638
786
if(ret < 0){
639
perror("connect");
640
return -1;
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
641
798
}
642
799
643
800
const char *out = mandos_protocol_version;
647
804
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
805
out_size - written));
649
806
if(ret == -1){
650
perror("write");
651
retval = -1;
807
int e = errno;
808
perror_plus("write");
809
errno = e;
652
810
goto mandos_end;
653
811
}
654
812
written += (size_t)ret;
662
820
break;
663
821
}
664
822
}
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
665
828
}
666
829
667
830
if(debug){
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
833
}
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
/* Spurious warning from -Wint-to-pointer-cast */
671
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
842
673
do{
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
848
do {
674
849
ret = gnutls_handshake(session);
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
675
854
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
855
677
856
if(ret != GNUTLS_E_SUCCESS){
678
857
if(debug){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
680
860
gnutls_perror(ret);
681
861
}
682
retval = -1;
862
errno = EPROTO;
683
863
goto mandos_end;
684
864
}
685
865
686
866
/* Read OpenPGP packet that contains the wanted password */
687
867
688
868
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
691
871
}
692
872
693
873
while(true){
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
694
880
buffer_capacity = incbuffer(&buffer, buffer_length,
695
881
buffer_capacity);
696
882
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
886
goto mandos_end;
887
}
888
889
if(quit_now){
890
errno = EINTR;
699
891
goto mandos_end;
700
892
}
701
893
710
902
case GNUTLS_E_AGAIN:
711
903
break;
712
904
case GNUTLS_E_REHANDSHAKE:
713
do{
905
do {
714
906
ret = gnutls_handshake(session);
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
715
912
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
913
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
718
916
gnutls_perror(ret);
719
retval = -1;
917
errno = EPROTO;
720
918
goto mandos_end;
721
919
}
722
920
break;
723
921
default:
724
fprintf(stderr, "Unknown error while reading data from"
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
725
924
" encrypted session with Mandos server\n");
726
retval = -1;
727
925
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
728
927
goto mandos_end;
729
928
}
730
929
} else {
733
932
}
734
933
735
934
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
951
741
952
if(buffer_length > 0){
953
ssize_t decrypted_buffer_size;
742
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
955
buffer_length,
744
956
&decrypted_buffer);
745
957
if(decrypted_buffer_size >= 0){
958
746
959
written = 0;
747
960
while(written < (size_t) decrypted_buffer_size){
961
if(quit_now){
962
errno = EINTR;
963
goto mandos_end;
964
}
965
748
966
ret = (int)fwrite(decrypted_buffer + written, 1,
749
967
(size_t)decrypted_buffer_size - written,
750
968
stdout);
751
969
if(ret == 0 and ferror(stdout)){
970
int e = errno;
752
971
if(debug){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
754
974
strerror(errno));
755
975
}
756
retval = -1;
757
break;
976
errno = e;
977
goto mandos_end;
758
978
}
759
979
written += (size_t)ret;
760
980
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
981
retval = 0;
764
982
}
765
} else {
766
retval = -1;
767
983
}
768
984
769
985
/* Shutdown procedure */
770
986
771
987
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
776
1007
}
777
gnutls_deinit(session);
778
1008
return retval;
779
1009
}
780
1010
797
1027
/* Called whenever a service has been resolved successfully or
798
1028
timed out */
799
1029
1030
if(quit_now){
1031
return;
1032
}
1033
800
1034
switch(event){
801
1035
default:
802
1036
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
804
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
1040
avahi_strerror(avahi_server_errno(mc.server)));
806
1041
break;
810
1045
char ip[AVAHI_ADDRESS_STR_MAX];
811
1046
avahi_address_snprint(ip, sizeof(ip), address);
812
1047
if(debug){
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
814
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
1051
ip, (intmax_t)interface, port);
816
1052
}
818
1054
avahi_proto_to_af(proto));
819
1055
if(ret == 0){
820
1056
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
821
1060
}
822
1061
}
823
1062
}
839
1078
/* Called whenever a new services becomes available on the LAN or
840
1079
is removed from the LAN */
841
1080
1081
if(quit_now){
1082
return;
1083
}
1084
842
1085
switch(event){
843
1086
default:
844
1087
case AVAHI_BROWSER_FAILURE:
845
1088
846
fprintf(stderr, "(Avahi browser) %s\n",
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
847
1091
avahi_strerror(avahi_server_errno(mc.server)));
848
1092
avahi_simple_poll_quit(mc.simple_poll);
849
1093
return;
854
1098
the callback function is called the Avahi server will free the
855
1099
resolver for us. */
856
1100
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
862
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
863
1107
break;
864
1108
868
1112
case AVAHI_BROWSER_ALL_FOR_NOW:
869
1113
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
1114
if(debug){
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
872
1117
}
873
1118
break;
874
1119
}
875
1120
}
876
1121
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
881
1124
if(quit_now){
882
1125
return;
883
1126
}
884
1127
quit_now = 1;
1128
signal_received = sig;
885
1129
int old_errno = errno;
1130
/* set main loop to exit */
886
1131
if(mc.simple_poll != NULL){
887
1132
avahi_simple_poll_quit(mc.simple_poll);
888
1133
}
889
1134
errno = old_errno;
890
1135
}
891
1136
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
892
1407
int main(int argc, char *argv[]){
893
1408
AvahiSServiceBrowser *sb = NULL;
894
1409
int error;
896
1411
intmax_t tmpmax;
897
1412
char *tmp;
898
1413
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
1414
const char *interface = "";
900
1415
struct ifreq network;
901
int sd;
1416
int sd = -1;
1417
bool take_down_interface = false;
902
1418
uid_t uid;
903
1419
gid_t gid;
904
char *connect_to = NULL;
905
1420
char tempdir[] = "/tmp/mandosXXXXXX";
906
1421
bool tempdir_created = false;
907
1422
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
1423
const char *seckey = PATHDIR "/" SECKEY;
909
1424
const char *pubkey = PATHDIR "/" PUBKEY;
910
1425
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
1426
bool gnutls_initialized = false;
916
1427
bool gpgme_initialized = false;
917
1428
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
918
1431
919
struct sigaction old_sigterm_action;
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
920
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
1434
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
922
1456
{
923
1457
struct argp_option options[] = {
924
1458
{ .name = "debug", .key = 128,
953
1487
.arg = "SECONDS",
954
1488
.doc = "Maximum delay to wait for interface startup",
955
1489
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
956
1507
{ .name = NULL }
957
1508
};
958
1509
959
1510
error_t parse_opt(int key, char *arg,
960
1511
struct argp_state *state){
1512
errno = 0;
961
1513
switch(key){
962
1514
case 128: /* --debug */
963
1515
debug = true;
979
1531
tmpmax = strtoimax(arg, &tmp, 10);
980
1532
if(errno != 0 or tmp == arg or *tmp != '\0'
981
1533
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
1534
argp_error(state, "Bad number of DH bits");
984
1535
}
985
1536
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
1537
break;
991
1542
errno = 0;
992
1543
delay = strtof(arg, &tmp);
993
1544
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
exit(argp_err_exit_status);
1001
1573
break;
1002
1574
default:
1003
1575
return ARGP_ERR_UNKNOWN;
1004
1576
}
1005
return 0;
1577
return errno;
1006
1578
}
1007
1579
1008
1580
struct argp argp = { .options = options, .parser = parse_opt,
1009
1581
.args_doc = "",
1010
1582
.doc = "Mandos client -- Get and decrypt"
1011
1583
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1017
1752
}
1018
1753
}
1019
1754
1021
1756
avahi_set_log_function(empty_log);
1022
1757
}
1023
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1024
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1025
1794
from the signal handler */
1026
1795
/* Initialize the pseudo-RNG for Avahi */
1027
1796
srand((unsigned int) time(NULL));
1028
1797
mc.simple_poll = avahi_simple_poll_new();
1029
1798
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1032
1802
goto end;
1033
1803
}
1034
1804
1035
1805
sigemptyset(&sigterm_action.sa_mask);
1036
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
1807
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1040
1810
goto end;
1041
1811
}
1042
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
1813
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1046
1816
goto end;
1047
1817
}
1048
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
1819
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1827
*/
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
if(ret == -1){
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1832
}
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1838
goto end;
1839
}
1840
}
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
if(ret == -1){
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1845
}
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1851
goto end;
1852
}
1853
}
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
if(ret == -1){
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1858
}
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1864
goto end;
1865
}
1866
}
1060
1867
1061
1868
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1063
1889
#ifdef __linux__
1064
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1891
messages about the network interface to mess up the prompt */
1066
1892
ret = klogctl(8, NULL, 5);
1067
1893
bool restore_loglevel = true;
1068
1894
if(ret == -1){
1069
1895
restore_loglevel = false;
1070
perror("klogctl");
1896
perror_plus("klogctl");
1071
1897
}
1072
1898
#endif /* __linux__ */
1073
1899
1074
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
1901
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1078
1904
#ifdef __linux__
1079
1905
if(restore_loglevel){
1080
1906
ret = klogctl(7, NULL, 0);
1081
1907
if(ret == -1){
1082
perror("klogctl");
1908
perror_plus("klogctl");
1083
1909
}
1084
1910
}
1085
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1086
1918
goto end;
1087
1919
}
1088
1920
strcpy(network.ifr_name, interface);
1089
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
1922
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1923
perror_plus("ioctl SIOCGIFFLAGS");
1092
1924
#ifdef __linux__
1093
1925
if(restore_loglevel){
1094
1926
ret = klogctl(7, NULL, 0);
1095
1927
if(ret == -1){
1096
perror("klogctl");
1928
perror_plus("klogctl");
1097
1929
}
1098
1930
}
1099
1931
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1101
1939
goto end;
1102
1940
}
1103
1941
if((network.ifr_flags & IFF_UP) == 0){
1104
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1105
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
1945
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1109
1949
#ifdef __linux__
1110
1950
if(restore_loglevel){
1111
1951
ret = klogctl(7, NULL, 0);
1112
1952
if(ret == -1){
1113
perror("klogctl");
1953
perror_plus("klogctl");
1114
1954
}
1115
1955
}
1116
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1117
1963
goto end;
1118
1964
}
1119
1965
}
1120
/* sleep checking until interface is running */
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1121
1968
for(int i=0; i < delay * 4; i++){
1122
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
1970
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1971
perror_plus("ioctl SIOCGIFFLAGS");
1125
1972
} else if(network.ifr_flags & IFF_RUNNING){
1126
1973
break;
1127
1974
}
1128
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
1976
ret = nanosleep(&sleeptime, NULL);
1130
1977
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1978
perror_plus("nanosleep");
1132
1979
}
1133
1980
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1137
1987
}
1138
1988
#ifdef __linux__
1139
1989
if(restore_loglevel){
1140
1990
/* Restores kernel loglevel to default */
1141
1991
ret = klogctl(7, NULL, 0);
1142
1992
if(ret == -1){
1143
perror("klogctl");
1993
perror_plus("klogctl");
1144
1994
}
1145
1995
}
1146
1996
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
1161
2016
}
1162
2017
1163
2018
ret = init_gnutls_global(pubkey, seckey);
1164
2019
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
1167
2023
goto end;
1168
2024
} else {
1169
2025
gnutls_initialized = true;
1170
2026
}
1171
2027
2028
if(quit_now){
2029
goto end;
2030
}
2031
1172
2032
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
2033
perror_plus("mkdtemp");
1174
2034
goto end;
1175
2035
}
1176
2036
tempdir_created = true;
1177
2037
2038
if(quit_now){
2039
goto end;
2040
}
2041
1178
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
1181
2046
goto end;
1182
2047
} else {
1183
2048
gpgme_initialized = true;
1184
2049
}
1185
2050
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
2051
if(quit_now){
2052
goto end;
1193
2053
}
1194
2054
1195
2055
if(connect_to != NULL){
1197
2057
/* (Mainly meant for debugging) */
1198
2058
char *address = strrchr(connect_to, ':');
1199
2059
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
1204
2070
uint16_t port;
1205
2071
errno = 0;
1206
2072
tmpmax = strtoimax(address+1, &tmp, 10);
1207
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
2074
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
2078
goto end;
2079
}
2080
2081
if(quit_now){
2082
goto end;
2083
}
2084
1213
2085
port = (uint16_t)tmpmax;
1214
2086
*address = '\0';
1215
address = connect_to;
1216
2087
/* Colon in address indicates IPv6 */
1217
2088
int af;
1218
if(strchr(address, ':') != NULL){
2089
if(strchr(connect_to, ':') != NULL){
1219
2090
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
1220
2097
} else {
1221
2098
af = AF_INET;
1222
2099
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
2100
address = connect_to;
2101
2102
if(quit_now){
2103
goto end;
2104
}
2105
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
1227
2119
exitcode = EXIT_SUCCESS;
1228
2120
}
1229
goto end;
1230
}
1231
2121
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
1232
2129
{
1233
2130
AvahiServerConfig config;
1234
2131
/* Do not publish any local Zeroconf records */
1249
2146
1250
2147
/* Check if creating the Avahi server object succeeded */
1251
2148
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1253
2151
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
2152
exitcode = EX_UNAVAILABLE;
2153
goto end;
2154
}
2155
2156
if(quit_now){
1255
2157
goto end;
1256
2158
}
1257
2159
1258
2160
/* Create the Avahi service browser */
1259
2161
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1261
2163
NULL, 0, browse_callback, NULL);
1262
2164
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1264
2167
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
1266
2173
goto end;
1267
2174
}
1268
2175
1269
2176
/* Run the main loop */
1270
2177
1271
2178
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1276
2190
1277
2191
end:
1278
2192
1279
2193
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1281
2196
}
1282
2197
1283
2198
/* Cleanup things */
1299
2214
if(gpgme_initialized){
1300
2215
gpgme_release(mc.ctx);
1301
2216
}
1302
1303
/* Removes the temp directory used by GPGME */
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
2261
}
2262
2263
/* Removes the GPGME temp directory and all files inside */
1304
2264
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
1325
2272
char *fullname = NULL;
1326
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
2274
direntry->d_name);
1328
2275
if(ret < 0){
1329
perror("asprintf");
2276
perror_plus("asprintf");
1330
2277
continue;
1331
2278
}
1332
2279
ret = remove(fullname);
1333
2280
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1336
2283
}
1337
2284
free(fullname);
1338
2285
}
1339
closedir(d);
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1340
2292
}
1341
2293
ret = rmdir(tempdir);
1342
2294
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
2295
perror_plus("rmdir");
2296
}
2297
}
2298
2299
if(quit_now){
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
2305
if(ret == -1){
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
1345
2316
}
1346
2317
1347
2318
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0