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237.16.6
(compared to revision 237.2.96)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-11-13 13:55:45 UTC
- mto: (237.15.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111113135545-hyb59g1q2icwdcte
* plugins.d/mandos-client.c: Some white space fixes.
(runnable_hook): Simplify name rule. More debug messages.
(runnable_hook): Simplify name rule. More debug messages.
- 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,
80
81
argp_parse(), ARGP_KEY_ARG,
81
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
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() */
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
249
325
return false;
250
326
}
251
327
252
return true;
328
return true;
253
329
}
254
330
255
331
/*
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
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
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",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
322
407
}
323
408
}
324
409
}
326
411
}
327
412
328
413
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
330
416
}
331
417
332
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
335
421
plaintext_length = -1;
336
422
goto decrypt_end;
337
423
}
339
425
*plaintext = NULL;
340
426
while(true){
341
427
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
344
430
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
348
434
}
349
435
350
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
441
break;
356
442
}
357
443
if(ret < 0){
358
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
359
445
plaintext_length = -1;
360
446
goto decrypt_end;
361
447
}
363
449
}
364
450
365
451
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
367
454
for(ssize_t i = 0; i < plaintext_length; i++){
368
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
456
}
391
478
/* GnuTLS log function callback */
392
479
static void debuggnutls(__attribute__((unused)) int level,
393
480
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
395
482
}
396
483
397
484
static int init_gnutls_global(const char *pubkeyfilename,
399
486
int ret;
400
487
401
488
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
403
491
}
404
492
405
493
ret = gnutls_global_init();
406
494
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
409
497
return -1;
410
498
}
411
499
418
506
}
419
507
420
508
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
422
510
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
428
513
gnutls_global_deinit();
429
514
return -1;
430
515
}
431
516
432
517
if(debug){
433
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"
434
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
521
seckeyfilename);
436
522
}
440
526
GNUTLS_OPENPGP_FMT_BASE64);
441
527
if(ret != GNUTLS_E_SUCCESS){
442
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
443
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
447
534
goto globalfail;
448
535
}
449
536
450
537
/* GnuTLS server initialization */
451
538
ret = gnutls_dh_params_init(&mc.dh_params);
452
539
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
454
542
" %s\n", safer_gnutls_strerror(ret));
455
543
goto globalfail;
456
544
}
457
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
546
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
460
549
safer_gnutls_strerror(ret));
461
550
goto globalfail;
462
551
}
476
565
static int init_gnutls_session(gnutls_session_t *session){
477
566
int ret;
478
567
/* GnuTLS session creation */
479
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);
480
574
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
482
577
safer_gnutls_strerror(ret));
483
578
}
484
579
485
580
{
486
581
const char *err;
487
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);
488
589
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
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));
492
594
gnutls_deinit(*session);
493
595
return -1;
494
596
}
495
597
}
496
598
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
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);
499
607
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
501
610
safer_gnutls_strerror(ret));
502
611
gnutls_deinit(*session);
503
612
return -1;
504
613
}
505
614
506
615
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
617
510
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
511
619
520
628
static int start_mandos_communication(const char *ip, uint16_t port,
521
629
AvahiIfIndex if_index,
522
630
int af){
523
int ret, tcp_sd;
631
int ret, tcp_sd = -1;
524
632
ssize_t sret;
525
633
union {
526
634
struct sockaddr_in in;
527
635
struct sockaddr_in6 in6;
528
636
} to;
529
637
char *buffer = NULL;
530
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
531
639
size_t buffer_length = 0;
532
640
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
641
size_t written;
535
int retval = 0;
642
int retval = -1;
536
643
gnutls_session_t session;
537
644
int pf; /* Protocol family */
538
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
539
653
switch(af){
540
654
case AF_INET6:
541
655
pf = PF_INET6;
544
658
pf = PF_INET;
545
659
break;
546
660
default:
547
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;
548
664
return -1;
549
665
}
550
666
554
670
}
555
671
556
672
if(debug){
557
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
558
675
"\n", ip, port);
559
676
}
560
677
561
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
679
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
565
689
}
566
690
567
691
memset(&to, 0, sizeof(to));
573
697
ret = inet_pton(af, ip, &to.in.sin_addr);
574
698
}
575
699
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
578
704
}
579
705
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
582
711
}
583
712
if(af == AF_INET6){
584
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
587
716
588
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
719
-Wunreachable-code*/
591
720
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
593
723
" without a network interface\n");
594
return -1;
724
errno = EINVAL;
725
goto mandos_end;
595
726
}
596
727
/* Set the network interface number as scope */
597
728
to.in6.sin6_scope_id = (uint32_t)if_index;
602
733
-Wunreachable-code */
603
734
}
604
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
605
741
if(debug){
606
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
743
char interface[IF_NAMESIZE];
608
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
745
perror_plus("if_indextoname");
610
746
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
612
749
ip, interface, port);
613
750
}
614
751
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
617
754
}
618
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
626
763
sizeof(addrstr));
627
764
}
628
765
if(pcret == NULL){
629
perror("inet_ntop");
766
perror_plus("inet_ntop");
630
767
} else {
631
768
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
633
771
}
634
772
}
635
773
}
636
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
637
780
if(af == AF_INET6){
638
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
782
} else {
640
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
784
}
642
785
if(ret < 0){
643
perror("connect");
644
return -1;
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
645
797
}
646
798
647
799
const char *out = mandos_protocol_version;
649
801
while(true){
650
802
size_t out_size = strlen(out);
651
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
804
out_size - written));
653
805
if(ret == -1){
654
perror("write");
655
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
656
809
goto mandos_end;
657
810
}
658
811
written += (size_t)ret;
666
819
break;
667
820
}
668
821
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
669
827
}
670
828
671
829
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
675
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
841
677
do{
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
678
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
679
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
854
681
855
if(ret != GNUTLS_E_SUCCESS){
682
856
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
684
859
gnutls_perror(ret);
685
860
}
686
retval = -1;
861
errno = EPROTO;
687
862
goto mandos_end;
688
863
}
689
864
690
865
/* Read OpenPGP packet that contains the wanted password */
691
866
692
867
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
695
870
}
696
871
697
872
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
698
879
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
880
buffer_capacity);
700
881
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
703
890
goto mandos_end;
704
891
}
705
892
714
901
case GNUTLS_E_AGAIN:
715
902
break;
716
903
case GNUTLS_E_REHANDSHAKE:
717
do{
904
do {
718
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
719
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
912
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
722
915
gnutls_perror(ret);
723
retval = -1;
916
errno = EPROTO;
724
917
goto mandos_end;
725
918
}
726
919
break;
727
920
default:
728
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
729
923
" encrypted session with Mandos server\n");
730
retval = -1;
731
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
732
926
goto mandos_end;
733
927
}
734
928
} else {
737
931
}
738
932
739
933
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
744
950
745
951
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
748
954
&decrypted_buffer);
749
955
if(decrypted_buffer_size >= 0){
956
750
957
written = 0;
751
958
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
752
964
ret = (int)fwrite(decrypted_buffer + written, 1,
753
965
(size_t)decrypted_buffer_size - written,
754
966
stdout);
755
967
if(ret == 0 and ferror(stdout)){
968
int e = errno;
756
969
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
758
972
strerror(errno));
759
973
}
760
retval = -1;
761
break;
974
errno = e;
975
goto mandos_end;
762
976
}
763
977
written += (size_t)ret;
764
978
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
979
retval = 0;
768
980
}
769
} else {
770
retval = -1;
771
981
}
772
982
773
983
/* Shutdown procedure */
774
984
775
985
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
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
}
780
1005
}
781
gnutls_deinit(session);
782
1006
return retval;
783
1007
}
784
1008
801
1025
/* Called whenever a service has been resolved successfully or
802
1026
timed out */
803
1027
1028
if(quit_now){
1029
return;
1030
}
1031
804
1032
switch(event){
805
1033
default:
806
1034
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
808
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
1038
avahi_strerror(avahi_server_errno(mc.server)));
810
1039
break;
814
1043
char ip[AVAHI_ADDRESS_STR_MAX];
815
1044
avahi_address_snprint(ip, sizeof(ip), address);
816
1045
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
818
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
1049
ip, (intmax_t)interface, port);
820
1050
}
822
1052
avahi_proto_to_af(proto));
823
1053
if(ret == 0){
824
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
825
1058
}
826
1059
}
827
1060
}
843
1076
/* Called whenever a new services becomes available on the LAN or
844
1077
is removed from the LAN */
845
1078
1079
if(quit_now){
1080
return;
1081
}
1082
846
1083
switch(event){
847
1084
default:
848
1085
case AVAHI_BROWSER_FAILURE:
849
1086
850
fprintf(stderr, "(Avahi browser) %s\n",
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
851
1089
avahi_strerror(avahi_server_errno(mc.server)));
852
1090
avahi_simple_poll_quit(mc.simple_poll);
853
1091
return;
861
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
1100
name, type, domain, protocol, 0,
863
1101
resolve_callback, NULL) == NULL)
864
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",
865
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
866
1105
break;
867
1106
871
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1112
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
875
1115
}
876
1116
break;
877
1117
}
878
1118
}
879
1119
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
884
1122
if(quit_now){
885
1123
return;
886
1124
}
887
1125
quit_now = 1;
1126
signal_received = sig;
888
1127
int old_errno = errno;
1128
/* set main loop to exit */
889
1129
if(mc.simple_poll != NULL){
890
1130
avahi_simple_poll_quit(mc.simple_poll);
891
1131
}
892
1132
errno = old_errno;
893
1133
}
894
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
895
1413
int main(int argc, char *argv[]){
896
1414
AvahiSServiceBrowser *sb = NULL;
897
1415
int error;
899
1417
intmax_t tmpmax;
900
1418
char *tmp;
901
1419
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
1420
const char *interface = "";
903
1421
struct ifreq network;
904
int sd;
1422
int sd = -1;
1423
bool take_down_interface = false;
905
1424
uid_t uid;
906
1425
gid_t gid;
907
char *connect_to = NULL;
908
1426
char tempdir[] = "/tmp/mandosXXXXXX";
909
1427
bool tempdir_created = false;
910
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
1432
bool gnutls_initialized = false;
915
1433
bool gpgme_initialized = false;
916
1434
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
917
1437
918
struct sigaction old_sigterm_action;
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1439
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
1440
1441
uid = getuid();
1442
gid = getgid();
1443
1444
/* Lower any group privileges we might have, just to be safe */
1445
errno = 0;
1446
ret = setgid(gid);
1447
if(ret == -1){
1448
perror_plus("setgid");
1449
}
1450
1451
/* Lower user privileges (temporarily) */
1452
errno = 0;
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror_plus("seteuid");
1456
}
1457
1458
if(quit_now){
1459
goto end;
1460
}
1461
921
1462
{
922
1463
struct argp_option options[] = {
923
1464
{ .name = "debug", .key = 128,
952
1493
.arg = "SECONDS",
953
1494
.doc = "Maximum delay to wait for interface startup",
954
1495
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
/*
1505
* These reproduce what we would get without ARGP_NO_HELP
1506
*/
1507
{ .name = "help", .key = '?',
1508
.doc = "Give this help list", .group = -1 },
1509
{ .name = "usage", .key = -3,
1510
.doc = "Give a short usage message", .group = -1 },
1511
{ .name = "version", .key = 'V',
1512
.doc = "Print program version", .group = -1 },
955
1513
{ .name = NULL }
956
1514
};
957
1515
958
1516
error_t parse_opt(int key, char *arg,
959
1517
struct argp_state *state){
1518
errno = 0;
960
1519
switch(key){
961
1520
case 128: /* --debug */
962
1521
debug = true;
978
1537
tmpmax = strtoimax(arg, &tmp, 10);
979
1538
if(errno != 0 or tmp == arg or *tmp != '\0'
980
1539
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1540
argp_error(state, "Bad number of DH bits");
983
1541
}
984
1542
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1543
break;
990
1548
errno = 0;
991
1549
delay = strtof(arg, &tmp);
992
1550
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1551
argp_error(state, "Bad delay");
1552
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
break;
1565
/*
1566
* These reproduce what we would get without ARGP_NO_HELP
1567
*/
1568
case '?': /* --help */
1569
argp_state_help(state, state->out_stream,
1570
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1571
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1572
case -3: /* --usage */
1573
argp_state_help(state, state->out_stream,
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
exit(argp_err_exit_status);
1000
1579
break;
1001
1580
default:
1002
1581
return ARGP_ERR_UNKNOWN;
1003
1582
}
1004
return 0;
1583
return errno;
1005
1584
}
1006
1585
1007
1586
struct argp argp = { .options = options, .parser = parse_opt,
1008
1587
.args_doc = "",
1009
1588
.doc = "Mandos client -- Get and decrypt"
1010
1589
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1590
ret = argp_parse(&argp, argc, argv,
1591
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
switch(ret){
1593
case 0:
1594
break;
1595
case ENOMEM:
1596
default:
1597
errno = ret;
1598
perror_plus("argp_parse");
1599
exitcode = EX_OSERR;
1600
goto end;
1601
case EINVAL:
1602
exitcode = EX_USAGE;
1603
goto end;
1604
}
1605
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1016
1758
}
1017
1759
}
1018
1760
1020
1762
avahi_set_log_function(empty_log);
1021
1763
}
1022
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1023
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
1800
from the signal handler */
1025
1801
/* Initialize the pseudo-RNG for Avahi */
1026
1802
srand((unsigned int) time(NULL));
1027
1803
mc.simple_poll = avahi_simple_poll_new();
1028
1804
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
1807
exitcode = EX_UNAVAILABLE;
1031
1808
goto end;
1032
1809
}
1033
1810
1034
1811
sigemptyset(&sigterm_action.sa_mask);
1035
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
1813
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1039
1816
goto end;
1040
1817
}
1041
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
1819
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1045
1822
goto end;
1046
1823
}
1047
1824
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
1825
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
/* Need to check if the handler is SIG_IGN before handling:
1831
| [[info:libc:Initial Signal Actions]] |
1832
| [[info:libc:Basic Signal Handling]] |
1833
*/
1834
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
return EX_OSERR;
1838
}
1839
if(old_sigterm_action.sa_handler != SIG_IGN){
1840
ret = sigaction(SIGINT, &sigterm_action, NULL);
1841
if(ret == -1){
1842
perror_plus("sigaction");
1843
exitcode = EX_OSERR;
1844
goto end;
1845
}
1846
}
1847
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1059
1873
1060
1874
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1062
1895
#ifdef __linux__
1063
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1897
messages about the network interface to mess up the prompt */
1065
1898
ret = klogctl(8, NULL, 5);
1066
1899
bool restore_loglevel = true;
1067
1900
if(ret == -1){
1068
1901
restore_loglevel = false;
1069
perror("klogctl");
1902
perror_plus("klogctl");
1070
1903
}
1071
1904
#endif /* __linux__ */
1072
1905
1073
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
1907
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1077
1910
#ifdef __linux__
1078
1911
if(restore_loglevel){
1079
1912
ret = klogctl(7, NULL, 0);
1080
1913
if(ret == -1){
1081
perror("klogctl");
1914
perror_plus("klogctl");
1082
1915
}
1083
1916
}
1084
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1085
1924
goto end;
1086
1925
}
1087
1926
strcpy(network.ifr_name, interface);
1088
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
1928
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1929
perror_plus("ioctl SIOCGIFFLAGS");
1091
1930
#ifdef __linux__
1092
1931
if(restore_loglevel){
1093
1932
ret = klogctl(7, NULL, 0);
1094
1933
if(ret == -1){
1095
perror("klogctl");
1934
perror_plus("klogctl");
1096
1935
}
1097
1936
}
1098
1937
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1100
1945
goto end;
1101
1946
}
1102
1947
if((network.ifr_flags & IFF_UP) == 0){
1103
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1104
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
1951
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1108
1955
#ifdef __linux__
1109
1956
if(restore_loglevel){
1110
1957
ret = klogctl(7, NULL, 0);
1111
1958
if(ret == -1){
1112
perror("klogctl");
1959
perror_plus("klogctl");
1113
1960
}
1114
1961
}
1115
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1116
1969
goto end;
1117
1970
}
1118
1971
}
1119
/* sleep checking until interface is running */
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1120
1974
for(int i=0; i < delay * 4; i++){
1121
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
1976
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1977
perror_plus("ioctl SIOCGIFFLAGS");
1124
1978
} else if(network.ifr_flags & IFF_RUNNING){
1125
1979
break;
1126
1980
}
1127
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
1982
ret = nanosleep(&sleeptime, NULL);
1129
1983
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1984
perror_plus("nanosleep");
1131
1985
}
1132
1986
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1136
1993
}
1137
1994
#ifdef __linux__
1138
1995
if(restore_loglevel){
1139
1996
/* Restores kernel loglevel to default */
1140
1997
ret = klogctl(7, NULL, 0);
1141
1998
if(ret == -1){
1142
perror("klogctl");
1999
perror_plus("klogctl");
1143
2000
}
1144
2001
}
1145
2002
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2018
}
2019
2020
if(quit_now){
2021
goto end;
1160
2022
}
1161
2023
1162
2024
ret = init_gnutls_global(pubkey, seckey);
1163
2025
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2028
exitcode = EX_UNAVAILABLE;
1166
2029
goto end;
1167
2030
} else {
1168
2031
gnutls_initialized = true;
1169
2032
}
1170
2033
2034
if(quit_now){
2035
goto end;
2036
}
2037
1171
2038
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
2039
perror_plus("mkdtemp");
1173
2040
goto end;
1174
2041
}
1175
2042
tempdir_created = true;
1176
2043
2044
if(quit_now){
2045
goto end;
2046
}
2047
1177
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1180
2052
goto end;
1181
2053
} else {
1182
2054
gpgme_initialized = true;
1183
2055
}
1184
2056
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2057
if(quit_now){
2058
goto end;
1192
2059
}
1193
2060
1194
2061
if(connect_to != NULL){
1196
2063
/* (Mainly meant for debugging) */
1197
2064
char *address = strrchr(connect_to, ':');
1198
2065
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
1203
2076
uint16_t port;
1204
2077
errno = 0;
1205
2078
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
2080
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1212
2091
port = (uint16_t)tmpmax;
1213
2092
*address = '\0';
1214
address = connect_to;
1215
2093
/* Colon in address indicates IPv6 */
1216
2094
int af;
1217
if(strchr(address, ':') != NULL){
2095
if(strchr(connect_to, ':') != NULL){
1218
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
1219
2103
} else {
1220
2104
af = AF_INET;
1221
2105
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2106
address = connect_to;
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1226
2125
exitcode = EXIT_SUCCESS;
1227
2126
}
1228
goto end;
1229
}
1230
2127
2128
goto end;
2129
}
2130
2131
if(quit_now){
2132
goto end;
2133
}
2134
1231
2135
{
1232
2136
AvahiServerConfig config;
1233
2137
/* Do not publish any local Zeroconf records */
1248
2152
1249
2153
/* Check if creating the Avahi server object succeeded */
1250
2154
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
1252
2157
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2158
exitcode = EX_UNAVAILABLE;
2159
goto end;
2160
}
2161
2162
if(quit_now){
1254
2163
goto end;
1255
2164
}
1256
2165
1259
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
2169
NULL, 0, browse_callback, NULL);
1261
2170
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
1263
2173
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
1265
2179
goto end;
1266
2180
}
1267
2181
1268
2182
/* Run the main loop */
1269
2183
1270
2184
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2187
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2191
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
1275
2196
1276
2197
end:
1277
2198
1278
2199
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
1280
2202
}
1281
2203
1282
2204
/* Cleanup things */
1298
2220
if(gpgme_initialized){
1299
2221
gpgme_release(mc.ctx);
1300
2222
}
1301
1302
/* Removes the temp directory used by GPGME */
2223
2224
/* Cleans up the circular linked list of Mandos servers the client
2225
has seen */
2226
if(mc.current_server != NULL){
2227
mc.current_server->prev->next = NULL;
2228
while(mc.current_server != NULL){
2229
server *next = mc.current_server->next;
2230
free(mc.current_server);
2231
mc.current_server = next;
2232
}
2233
}
2234
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2244
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2266
}
2267
}
2268
2269
/* Removes the GPGME temp directory and all files inside */
1303
2270
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
1324
2278
char *fullname = NULL;
1325
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
2280
direntry->d_name);
1327
2281
if(ret < 0){
1328
perror("asprintf");
2282
perror_plus("asprintf");
1329
2283
continue;
1330
2284
}
1331
2285
ret = remove(fullname);
1332
2286
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1335
2289
}
1336
2290
free(fullname);
1337
2291
}
1338
closedir(d);
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
1339
2298
}
1340
2299
ret = rmdir(tempdir);
1341
2300
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2301
perror_plus("rmdir");
2302
}
2303
}
2304
2305
if(quit_now){
2306
sigemptyset(&old_sigterm_action.sa_mask);
2307
old_sigterm_action.sa_handler = SIG_DFL;
2308
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2309
&old_sigterm_action,
2310
NULL));
2311
if(ret == -1){
2312
perror_plus("sigaction");
2313
}
2314
do {
2315
ret = raise(signal_received);
2316
} while(ret != 0 and errno == EINTR);
2317
if(ret != 0){
2318
perror_plus("raise");
2319
abort();
2320
}
2321
TEMP_FAILURE_RETRY(pause());
1344
2322
}
1345
2323
1346
2324
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0