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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:20:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20090905172046-s92efz3m1j4c1sti
* plugins-runner.c (main): Bug fix: Close config file.
- files removed:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
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() */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
110
105
init_gnutls_session(),
111
106
GNUTLS_* */
112
107
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
115
110
116
111
/* GPGME */
117
112
#include <gpgme.h> /* All GPGME types, constants and
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
const char *argp_program_version = "mandos-client " VERSION;
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.dh_bits = 1024, .priority = "SECURE256"
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
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
176
144
177
145
/*
178
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
180
148
* "buffer_length" is how much is already used.
181
149
*/
182
150
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
151
size_t buffer_capacity){
184
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
154
if(buffer == NULL){
191
159
return buffer_capacity;
192
160
}
193
161
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
231
162
/*
232
163
* Initialize GPGME.
233
164
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
236
168
gpgme_error_t rc;
237
169
gpgme_engine_info_t engine_info;
238
170
241
173
* Helper function to insert pub and seckey to the engine keyring.
242
174
*/
243
175
bool import_key(const char *filename){
244
int ret;
245
176
int fd;
246
177
gpgme_data_t pgp_data;
247
178
248
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
180
if(fd == -1){
250
perror_plus("open");
181
perror("open");
251
182
return false;
252
183
}
253
184
254
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
186
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
188
gpgme_strsource(rc), gpgme_strerror(rc));
259
189
return false;
260
190
}
261
191
262
192
rc = gpgme_op_import(mc.ctx, pgp_data);
263
193
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
195
gpgme_strsource(rc), gpgme_strerror(rc));
267
196
return false;
268
197
}
269
198
270
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
200
if(ret == -1){
272
perror_plus("close");
201
perror("close");
273
202
}
274
203
gpgme_data_release(pgp_data);
275
204
return true;
276
205
}
277
206
278
207
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
281
209
}
282
210
283
211
/* Init GPGME */
284
212
gpgme_check_version(NULL);
285
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
214
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
216
gpgme_strsource(rc), gpgme_strerror(rc));
290
217
return false;
291
218
}
292
219
293
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
294
221
rc = gpgme_get_engine_info(&engine_info);
295
222
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
224
gpgme_strsource(rc), gpgme_strerror(rc));
299
225
return false;
300
226
}
307
233
engine_info = engine_info->next;
308
234
}
309
235
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
237
return false;
313
238
}
314
239
315
240
/* Create new GPGME "context" */
316
241
rc = gpgme_new(&(mc.ctx));
317
242
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
321
245
return false;
322
246
}
323
247
342
266
ssize_t plaintext_length = 0;
343
267
344
268
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
270
}
348
271
349
272
/* Create new GPGME data buffer from memory cryptotext */
350
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
274
0);
352
275
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
277
gpgme_strsource(rc), gpgme_strerror(rc));
356
278
return -1;
357
279
}
359
281
/* Create new empty GPGME data buffer for the plaintext */
360
282
rc = gpgme_data_new(&dh_plain);
361
283
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
285
gpgme_strsource(rc), gpgme_strerror(rc));
365
286
gpgme_data_release(dh_crypto);
366
287
return -1;
370
291
data buffer */
371
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
293
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
295
gpgme_strsource(rc), gpgme_strerror(rc));
376
296
plaintext_length = -1;
377
297
if(debug){
378
298
gpgme_decrypt_result_t result;
379
299
result = gpgme_op_decrypt_result(mc.ctx);
380
300
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
302
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
303
fprintf(stderr, "Unsupported algorithm: %s\n",
386
304
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
305
fprintf(stderr, "Wrong key usage: %u\n",
389
306
result->wrong_key_usage);
390
307
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
393
309
}
394
310
gpgme_recipient_t recipient;
395
311
recipient = result->recipients;
396
312
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
313
fprintf(stderr, "Public key algorithm: %s\n",
399
314
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",
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
404
317
recipient->status == GPG_ERR_NO_SECKEY
405
318
? "No" : "Yes");
406
319
recipient = recipient->next;
411
324
}
412
325
413
326
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
328
}
417
329
418
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
421
333
plaintext_length = -1;
422
334
goto decrypt_end;
423
335
}
425
337
*plaintext = NULL;
426
338
while(true){
427
339
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
430
342
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
434
346
}
435
347
436
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
353
break;
442
354
}
443
355
if(ret < 0){
444
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
445
357
plaintext_length = -1;
446
358
goto decrypt_end;
447
359
}
449
361
}
450
362
451
363
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
454
365
for(ssize_t i = 0; i < plaintext_length; i++){
455
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
367
}
478
389
/* GnuTLS log function callback */
479
390
static void debuggnutls(__attribute__((unused)) int level,
480
391
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
482
393
}
483
394
484
395
static int init_gnutls_global(const char *pubkeyfilename,
486
397
int ret;
487
398
488
399
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
491
401
}
492
402
493
403
ret = gnutls_global_init();
494
404
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
497
407
return -1;
498
408
}
499
409
506
416
}
507
417
508
418
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
510
420
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
513
426
gnutls_global_deinit();
514
427
return -1;
515
428
}
516
429
517
430
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
433
seckeyfilename);
522
434
}
526
438
GNUTLS_OPENPGP_FMT_BASE64);
527
439
if(ret != GNUTLS_E_SUCCESS){
528
440
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
534
445
goto globalfail;
535
446
}
536
447
537
448
/* GnuTLS server initialization */
538
449
ret = gnutls_dh_params_init(&mc.dh_params);
539
450
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
452
" %s\n", safer_gnutls_strerror(ret));
543
453
goto globalfail;
544
454
}
545
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
456
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
458
safer_gnutls_strerror(ret));
550
459
goto globalfail;
551
460
}
565
474
static int init_gnutls_session(gnutls_session_t *session){
566
475
int ret;
567
476
/* GnuTLS session creation */
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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
574
478
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
480
safer_gnutls_strerror(ret));
578
481
}
579
482
580
483
{
581
484
const char *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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
486
if(ret != GNUTLS_E_SUCCESS){
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));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
594
490
gnutls_deinit(*session);
595
491
return -1;
596
492
}
597
493
}
598
494
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);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
607
497
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
499
safer_gnutls_strerror(ret));
611
500
gnutls_deinit(*session);
612
501
return -1;
613
502
}
614
503
615
504
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
617
507
618
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
509
624
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
625
515
__attribute__((unused)) const char *txt){}
626
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
627
520
/* Called when a Mandos server is found */
628
521
static int start_mandos_communication(const char *ip, uint16_t port,
629
522
AvahiIfIndex if_index,
635
528
struct sockaddr_in6 in6;
636
529
} to;
637
530
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
639
532
size_t buffer_length = 0;
640
533
size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
641
535
size_t written;
642
int retval = -1;
536
int retval = 0;
643
537
gnutls_session_t session;
644
538
int pf; /* Protocol family */
645
539
646
errno = 0;
647
648
540
if(quit_now){
649
errno = EINTR;
650
541
return -1;
651
542
}
652
543
658
549
pf = PF_INET;
659
550
break;
660
551
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
552
fprintf(stderr, "Bad address family: %d\n", af);
664
553
return -1;
665
554
}
666
555
670
559
}
671
560
672
561
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
563
"\n", ip, port);
676
564
}
677
565
678
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
567
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
568
perror("socket");
569
retval = -1;
683
570
goto mandos_end;
684
571
}
685
572
686
573
if(quit_now){
687
errno = EINTR;
688
574
goto mandos_end;
689
575
}
690
576
697
583
ret = inet_pton(af, ip, &to.in.sin_addr);
698
584
}
699
585
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
586
perror("inet_pton");
587
retval = -1;
703
588
goto mandos_end;
704
589
}
705
590
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
591
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
710
593
goto mandos_end;
711
594
}
712
595
if(af == AF_INET6){
716
599
717
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
602
-Wunreachable-code*/
720
603
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
605
" without a network interface\n");
724
errno = EINVAL;
606
retval = -1;
725
607
goto mandos_end;
726
608
}
727
609
/* Set the network interface number as scope */
734
616
}
735
617
736
618
if(quit_now){
737
errno = EINTR;
738
619
goto mandos_end;
739
620
}
740
621
742
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
624
char interface[IF_NAMESIZE];
744
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
626
perror("if_indextoname");
746
627
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
629
ip, interface, port);
750
630
}
751
631
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
754
634
}
755
635
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
636
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
643
sizeof(addrstr));
764
644
}
765
645
if(pcret == NULL){
766
perror_plus("inet_ntop");
646
perror("inet_ntop");
767
647
} else {
768
648
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
649
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
650
}
772
651
}
773
652
}
774
653
775
654
if(quit_now){
776
errno = EINTR;
777
655
goto mandos_end;
778
656
}
779
657
783
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
662
}
785
663
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
664
perror("connect");
665
retval = -1;
791
666
goto mandos_end;
792
667
}
793
668
794
669
if(quit_now){
795
errno = EINTR;
796
670
goto mandos_end;
797
671
}
798
672
801
675
while(true){
802
676
size_t out_size = strlen(out);
803
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
678
out_size - written));
805
679
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
680
perror("write");
681
retval = -1;
809
682
goto mandos_end;
810
683
}
811
684
written += (size_t)ret;
821
694
}
822
695
823
696
if(quit_now){
824
errno = EINTR;
825
697
goto mandos_end;
826
698
}
827
699
}
828
700
829
701
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
702
fprintf(stderr, "Establishing TLS session with %s\n", ip);
832
703
}
833
704
834
705
if(quit_now){
835
errno = EINTR;
836
706
goto mandos_end;
837
707
}
838
708
839
/* Spurious warning from -Wint-to-pointer-cast */
840
709
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
710
842
711
if(quit_now){
843
errno = EINTR;
844
712
goto mandos_end;
845
713
}
846
714
847
do {
715
do{
848
716
ret = gnutls_handshake(session);
849
717
if(quit_now){
850
errno = EINTR;
851
718
goto mandos_end;
852
719
}
853
720
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
721
855
722
if(ret != GNUTLS_E_SUCCESS){
856
723
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
724
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
725
gnutls_perror(ret);
860
726
}
861
errno = EPROTO;
727
retval = -1;
862
728
goto mandos_end;
863
729
}
864
730
865
731
/* Read OpenPGP packet that contains the wanted password */
866
732
867
733
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
735
ip);
870
736
}
871
737
872
738
while(true){
873
739
874
740
if(quit_now){
875
errno = EINTR;
876
741
goto mandos_end;
877
742
}
878
743
879
744
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
745
buffer_capacity);
881
746
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
747
perror("incbuffer");
748
retval = -1;
885
749
goto mandos_end;
886
750
}
887
751
888
752
if(quit_now){
889
errno = EINTR;
890
753
goto mandos_end;
891
754
}
892
755
901
764
case GNUTLS_E_AGAIN:
902
765
break;
903
766
case GNUTLS_E_REHANDSHAKE:
904
do {
767
do{
905
768
ret = gnutls_handshake(session);
906
769
907
770
if(quit_now){
908
errno = EINTR;
909
771
goto mandos_end;
910
772
}
911
773
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
774
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
775
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
776
gnutls_perror(ret);
916
errno = EPROTO;
777
retval = -1;
917
778
goto mandos_end;
918
779
}
919
780
break;
920
781
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
782
fprintf(stderr, "Unknown error while reading data from"
923
783
" encrypted session with Mandos server\n");
784
retval = -1;
924
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
926
786
goto mandos_end;
927
787
}
928
788
} else {
931
791
}
932
792
933
793
if(debug){
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);
794
fprintf(stderr, "Closing TLS session\n");
795
}
796
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
950
806
951
807
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
954
810
&decrypted_buffer);
955
811
if(decrypted_buffer_size >= 0){
956
957
812
written = 0;
958
813
while(written < (size_t) decrypted_buffer_size){
959
814
if(quit_now){
960
errno = EINTR;
961
815
goto mandos_end;
962
816
}
963
817
965
819
(size_t)decrypted_buffer_size - written,
966
820
stdout);
967
821
if(ret == 0 and ferror(stdout)){
968
int e = errno;
969
822
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
823
fprintf(stderr, "Error writing encrypted data: %s\n",
972
824
strerror(errno));
973
825
}
974
errno = e;
975
goto mandos_end;
826
retval = -1;
827
break;
976
828
}
977
829
written += (size_t)ret;
978
830
}
979
retval = 0;
831
free(decrypted_buffer);
832
} else {
833
retval = -1;
980
834
}
835
} else {
836
retval = -1;
981
837
}
982
838
983
839
/* Shutdown procedure */
984
840
985
841
mandos_end:
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
}
842
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
846
if(ret == -1){
847
perror("close");
848
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
1005
852
}
1006
853
return retval;
1007
854
}
1032
879
switch(event){
1033
880
default:
1034
881
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
882
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
883
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
884
avahi_strerror(avahi_server_errno(mc.server)));
1039
885
break;
1043
889
char ip[AVAHI_ADDRESS_STR_MAX];
1044
890
avahi_address_snprint(ip, sizeof(ip), address);
1045
891
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
892
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
893
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
894
ip, (intmax_t)interface, port);
1050
895
}
1052
897
avahi_proto_to_af(proto));
1053
898
if(ret == 0){
1054
899
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1058
900
}
1059
901
}
1060
902
}
1084
926
default:
1085
927
case AVAHI_BROWSER_FAILURE:
1086
928
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
929
fprintf(stderr, "(Avahi browser) %s\n",
1089
930
avahi_strerror(avahi_server_errno(mc.server)));
1090
931
avahi_simple_poll_quit(mc.simple_poll);
1091
932
return;
1099
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
941
name, type, domain, protocol, 0,
1101
942
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
943
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1104
944
name, avahi_strerror(avahi_server_errno(mc.server)));
1105
945
break;
1106
946
1110
950
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
951
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
952
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
953
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
954
}
1116
955
break;
1117
956
}
1118
957
}
1119
958
1120
/* Signal handler that stops main loop after SIGTERM */
959
/* stop main loop after sigterm has been called */
1121
960
static void handle_sigterm(int sig){
1122
961
if(quit_now){
1123
962
return;
1125
964
quit_now = 1;
1126
965
signal_received = sig;
1127
966
int old_errno = errno;
1128
/* set main loop to exit */
1129
967
if(mc.simple_poll != NULL){
1130
968
avahi_simple_poll_quit(mc.simple_poll);
1131
969
}
1132
970
errno = old_errno;
1133
971
}
1134
972
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
1413
973
int main(int argc, char *argv[]){
1414
974
AvahiSServiceBrowser *sb = NULL;
1415
975
int error;
1417
977
intmax_t tmpmax;
1418
978
char *tmp;
1419
979
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
980
const char *interface = "eth0";
1421
981
struct ifreq network;
1422
982
int sd = -1;
1423
983
bool take_down_interface = false;
1424
984
uid_t uid;
1425
985
gid_t gid;
986
char *connect_to = NULL;
1426
987
char tempdir[] = "/tmp/mandosXXXXXX";
1427
988
bool tempdir_created = false;
1428
989
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
993
bool gnutls_initialized = false;
1433
994
bool gpgme_initialized = false;
1434
995
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
1437
996
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
997
struct sigaction old_sigterm_action;
1439
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1440
999
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
1462
1000
{
1463
1001
struct argp_option options[] = {
1464
1002
{ .name = "debug", .key = 128,
1493
1031
.arg = "SECONDS",
1494
1032
.doc = "Maximum delay to wait for interface startup",
1495
1033
.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 },
1513
1034
{ .name = NULL }
1514
1035
};
1515
1036
1516
1037
error_t parse_opt(int key, char *arg,
1517
1038
struct argp_state *state){
1518
errno = 0;
1519
1039
switch(key){
1520
1040
case 128: /* --debug */
1521
1041
debug = true;
1537
1057
tmpmax = strtoimax(arg, &tmp, 10);
1538
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1539
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1540
argp_error(state, "Bad number of DH bits");
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1541
1062
}
1542
1063
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1543
1064
break;
1548
1069
errno = 0;
1549
1070
delay = strtof(arg, &tmp);
1550
1071
if(errno != 0 or tmp == arg or *tmp != '\0'){
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);
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1074
}
1075
break;
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1579
1079
break;
1580
1080
default:
1581
1081
return ARGP_ERR_UNKNOWN;
1582
1082
}
1583
return errno;
1083
return 0;
1584
1084
}
1585
1085
1586
1086
struct argp argp = { .options = options, .parser = parse_opt,
1587
1087
.args_doc = "",
1588
1088
.doc = "Mandos client -- Get and decrypt"
1589
1089
" passwords from a Mandos server" };
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("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1763
1095
}
1764
1096
}
1765
1097
1767
1099
avahi_set_log_function(empty_log);
1768
1100
}
1769
1101
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
1103
from the signal handler */
1806
1104
/* Initialize the pseudo-RNG for Avahi */
1807
1105
srand((unsigned int) time(NULL));
1808
1106
mc.simple_poll = avahi_simple_poll_new();
1809
1107
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
1812
exitcode = EX_UNAVAILABLE;
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1813
1110
goto end;
1814
1111
}
1815
1112
1816
1113
sigemptyset(&sigterm_action.sa_mask);
1817
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1818
1115
if(ret == -1){
1819
perror_plus("sigaddset");
1820
exitcode = EX_OSERR;
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1821
1118
goto end;
1822
1119
}
1823
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1824
1121
if(ret == -1){
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1827
1124
goto end;
1828
1125
}
1829
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1830
1127
if(ret == -1){
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1833
1130
goto end;
1834
1131
}
1835
1132
/* Need to check if the handler is SIG_IGN before handling:
1838
1135
*/
1839
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1840
1137
if(ret == -1){
1841
perror_plus("sigaction");
1842
return EX_OSERR;
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1843
1140
}
1844
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1846
1143
if(ret == -1){
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1849
1146
goto end;
1850
1147
}
1851
1148
}
1852
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1853
1150
if(ret == -1){
1854
perror_plus("sigaction");
1855
return EX_OSERR;
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1856
1153
}
1857
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1858
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1859
1156
if(ret == -1){
1860
perror_plus("sigaction");
1861
exitcode = EX_OSERR;
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1862
1159
goto end;
1863
1160
}
1864
1161
}
1865
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1866
1163
if(ret == -1){
1867
perror_plus("sigaction");
1868
return EX_OSERR;
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1869
1166
}
1870
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1871
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1872
1169
if(ret == -1){
1873
perror_plus("sigaction");
1874
exitcode = EX_OSERR;
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1875
1172
goto end;
1876
1173
}
1877
1174
}
1878
1175
1879
1176
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1177
if(interface[0] != '\0'){
1881
1178
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
1179
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1180
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1886
1182
goto end;
1887
1183
}
1888
1184
1890
1186
goto end;
1891
1187
}
1892
1188
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
1189
#ifdef __linux__
1901
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1191
messages to mess up the prompt */
1903
1192
ret = klogctl(8, NULL, 5);
1904
1193
bool restore_loglevel = true;
1905
1194
if(ret == -1){
1906
1195
restore_loglevel = false;
1907
perror_plus("klogctl");
1196
perror("klogctl");
1908
1197
}
1909
1198
#endif /* __linux__ */
1910
1199
1911
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
1201
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1915
1204
#ifdef __linux__
1916
1205
if(restore_loglevel){
1917
1206
ret = klogctl(7, NULL, 0);
1918
1207
if(ret == -1){
1919
perror_plus("klogctl");
1208
perror("klogctl");
1920
1209
}
1921
1210
}
1922
1211
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
1212
goto end;
1930
1213
}
1931
1214
strcpy(network.ifr_name, interface);
1932
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
1216
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1217
perror("ioctl SIOCGIFFLAGS");
1935
1218
#ifdef __linux__
1936
1219
if(restore_loglevel){
1937
1220
ret = klogctl(7, NULL, 0);
1938
1221
if(ret == -1){
1939
perror_plus("klogctl");
1222
perror("klogctl");
1940
1223
}
1941
1224
}
1942
1225
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1226
exitcode = EXIT_FAILURE;
1950
1227
goto end;
1951
1228
}
1952
1229
if((network.ifr_flags & IFF_UP) == 0){
1955
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
1233
if(ret == -1){
1957
1234
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1960
1237
#ifdef __linux__
1961
1238
if(restore_loglevel){
1962
1239
ret = klogctl(7, NULL, 0);
1963
1240
if(ret == -1){
1964
perror_plus("klogctl");
1241
perror("klogctl");
1965
1242
}
1966
1243
}
1967
1244
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
1245
goto end;
1975
1246
}
1976
1247
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1248
/* sleep checking until interface is running */
1979
1249
for(int i=0; i < delay * 4; i++){
1980
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
1251
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1252
perror("ioctl SIOCGIFFLAGS");
1983
1253
} else if(network.ifr_flags & IFF_RUNNING){
1984
1254
break;
1985
1255
}
1986
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
1257
ret = nanosleep(&sleeptime, NULL);
1988
1258
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1259
perror("nanosleep");
1990
1260
}
1991
1261
}
1992
1262
if(not take_down_interface){
1993
1263
/* We won't need the socket anymore */
1994
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
1265
if(ret == -1){
1996
perror_plus("close");
1266
perror("close");
1997
1267
}
1998
1268
}
1999
1269
#ifdef __linux__
2001
1271
/* Restores kernel loglevel to default */
2002
1272
ret = klogctl(7, NULL, 0);
2003
1273
if(ret == -1){
2004
perror_plus("klogctl");
1274
perror("klogctl");
2005
1275
}
2006
1276
}
2007
1277
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
2023
1296
}
2024
1297
2025
1298
if(quit_now){
2028
1301
2029
1302
ret = init_gnutls_global(pubkey, seckey);
2030
1303
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
2034
1306
goto end;
2035
1307
} else {
2036
1308
gnutls_initialized = true;
2040
1312
goto end;
2041
1313
}
2042
1314
1315
tempdir_created = true;
2043
1316
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
1317
tempdir_created = false;
1318
perror("mkdtemp");
2045
1319
goto end;
2046
1320
}
2047
tempdir_created = true;
2048
1321
2049
1322
if(quit_now){
2050
1323
goto end;
2051
1324
}
2052
1325
2053
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2056
exitcode = EX_UNAVAILABLE;
1327
fprintf(stderr, "init_gpgme failed\n");
1328
exitcode = EXIT_FAILURE;
2057
1329
goto end;
2058
1330
} else {
2059
1331
gpgme_initialized = true;
2068
1340
/* (Mainly meant for debugging) */
2069
1341
char *address = strrchr(connect_to, ':');
2070
1342
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2073
exitcode = EX_USAGE;
1343
fprintf(stderr, "No colon in address\n");
1344
exitcode = EXIT_FAILURE;
2074
1345
goto end;
2075
1346
}
2076
1347
2083
1354
tmpmax = strtoimax(address+1, &tmp, 10);
2084
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
1356
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2088
exitcode = EX_USAGE;
1357
fprintf(stderr, "Bad port number\n");
1358
exitcode = EXIT_FAILURE;
2089
1359
goto end;
2090
1360
}
2091
1361
2095
1365
2096
1366
port = (uint16_t)tmpmax;
2097
1367
*address = '\0';
1368
address = connect_to;
2098
1369
/* Colon in address indicates IPv6 */
2099
1370
int af;
2100
if(strchr(connect_to, ':') != NULL){
1371
if(strchr(address, ':') != NULL){
2101
1372
af = AF_INET6;
2102
/* Accept [] around IPv6 address - see RFC 5952 */
2103
if(connect_to[0] == '[' and address[-1] == ']')
2104
{
2105
connect_to++;
2106
address[-1] = '\0';
2107
}
2108
1373
} else {
2109
1374
af = AF_INET;
2110
1375
}
2111
address = connect_to;
2112
1376
2113
1377
if(quit_now){
2114
1378
goto end;
2115
1379
}
2116
1380
2117
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2119
if(quit_now or ret == 0){
2120
break;
2121
}
2122
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2125
}
2126
sleep((int)retry_interval);
2127
}
2128
2129
if (not quit_now){
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
2130
1385
exitcode = EXIT_SUCCESS;
2131
1386
}
2132
2133
1387
goto end;
2134
1388
}
2135
1389
2157
1411
2158
1412
/* Check if creating the Avahi server object succeeded */
2159
1413
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
2162
1415
avahi_strerror(error));
2163
exitcode = EX_UNAVAILABLE;
1416
exitcode = EXIT_FAILURE;
2164
1417
goto end;
2165
1418
}
2166
1419
2173
1426
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
1427
NULL, 0, browse_callback, NULL);
2175
1428
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
1429
fprintf(stderr, "Failed to create service browser: %s\n",
2178
1430
avahi_strerror(avahi_server_errno(mc.server)));
2179
exitcode = EX_UNAVAILABLE;
1431
exitcode = EXIT_FAILURE;
2180
1432
goto end;
2181
1433
}
2182
1434
2187
1439
/* Run the main loop */
2188
1440
2189
1441
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2192
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2196
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2200
}
1442
fprintf(stderr, "Starting Avahi loop search\n");
1443
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
2201
1446
2202
1447
end:
2203
1448
2204
1449
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
1450
fprintf(stderr, "%s exiting\n", argv[0]);
2207
1451
}
2208
1452
2209
1453
/* Cleanup things */
2225
1469
if(gpgme_initialized){
2226
1470
gpgme_release(mc.ctx);
2227
1471
}
2228
2229
/* Cleans up the circular linked list of Mandos servers the client
2230
has seen */
2231
if(mc.current_server != NULL){
2232
mc.current_server->prev->next = NULL;
2233
while(mc.current_server != NULL){
2234
server *next = mc.current_server->next;
2235
free(mc.current_server);
2236
mc.current_server = next;
2237
}
2238
}
2239
2240
/* XXX run network hooks "stop" here */
2241
1472
2242
1473
/* Take down the network interface */
2243
1474
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
1476
if(ret == -1){
2248
perror_plus("seteuid");
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
2249
1484
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
}
2260
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2270
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
2271
1488
}
2272
1489
}
2273
1490
2274
/* Removes the GPGME temp directory and all files inside */
1491
/* Removes the temp directory used by GPGME */
2275
1492
if(tempdir_created){
2276
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
alphasort);
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
direntry = direntries[i];
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
1498
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
2283
1513
char *fullname = NULL;
2284
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
2285
1515
direntry->d_name);
2286
1516
if(ret < 0){
2287
perror_plus("asprintf");
1517
perror("asprintf");
2288
1518
continue;
2289
1519
}
2290
1520
ret = remove(fullname);
2291
1521
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1523
strerror(errno));
2294
1524
}
2295
1525
free(fullname);
2296
1526
}
2297
}
2298
2299
/* need to clean even if 0 because man page doesn't specify */
2300
free(direntries);
2301
if (numentries == -1){
2302
perror_plus("scandir");
1527
closedir(d);
2303
1528
}
2304
1529
ret = rmdir(tempdir);
2305
1530
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");
1531
perror("rmdir");
2307
1532
}
2308
1533
}
2309
1534
2310
1535
if(quit_now){
2311
1536
sigemptyset(&old_sigterm_action.sa_mask);
2312
1537
old_sigterm_action.sa_handler = SIG_DFL;
2313
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2314
&old_sigterm_action,
2315
NULL));
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2316
1539
if(ret == -1){
2317
perror_plus("sigaction");
2318
}
2319
do {
2320
ret = raise(signal_received);
2321
} while(ret != 0 and errno == EINTR);
2322
if(ret != 0){
2323
perror_plus("raise");
2324
abort();
2325
}
2326
TEMP_FAILURE_RETRY(pause());
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
2327
1543
}
2328
1544
2329
1545
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0