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237.2.105
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-04-17 08:26:17 UTC
- mto: (24.1.138 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090417082617-eltetak5lzjyz55o
* initramfs-tools-hook: Bug fix: Add "--userid" and "--groupid" to
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
- 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,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
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() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
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
137
/* Doubly linked list that need to be circularly linked when used */
138
typedef struct server{
139
const char *ip;
140
uint16_t port;
141
AvahiIfIndex if_index;
142
int af;
143
struct timespec last_seen;
144
struct server *next;
145
struct server *prev;
146
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
128
148
129
/* Used for passing in values through the Avahi callback functions */
149
130
typedef struct {
154
135
gnutls_dh_params_t dh_params;
155
136
const char *priority;
156
137
gpgme_ctx_t ctx;
157
server *current_server;
158
138
} mandos_context;
159
139
160
140
/* global context so signal handler can reach it*/
161
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
142
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
165
166
sig_atomic_t quit_now = 0;
167
int signal_received = 0;
168
169
/* Function to use when printing errors */
170
void perror_plus(const char *print_text){
171
fprintf(stderr, "Mandos plugin %s: ",
172
program_invocation_short_name);
173
perror(print_text);
174
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
175
144
176
145
/*
177
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
159
return buffer_capacity;
191
160
}
192
161
193
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
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
165
static bool init_gpgme(const char *seckey,
235
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
325
249
return false;
326
250
}
327
251
328
return true;
252
return true;
329
253
}
330
254
331
255
/*
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
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;
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
}
407
322
}
408
323
}
409
324
}
411
326
}
412
327
413
328
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
330
}
417
331
418
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
421
335
plaintext_length = -1;
422
336
goto decrypt_end;
423
337
}
428
342
(size_t)plaintext_length,
429
343
plaintext_capacity);
430
344
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
345
perror("incbuffer");
432
346
plaintext_length = -1;
433
347
goto decrypt_end;
434
348
}
441
355
break;
442
356
}
443
357
if(ret < 0){
444
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
445
359
plaintext_length = -1;
446
360
goto decrypt_end;
447
361
}
449
363
}
450
364
451
365
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
454
367
for(ssize_t i = 0; i < plaintext_length; i++){
455
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
369
}
478
391
/* GnuTLS log function callback */
479
392
static void debuggnutls(__attribute__((unused)) int level,
480
393
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
482
395
}
483
396
484
397
static int init_gnutls_global(const char *pubkeyfilename,
486
399
int ret;
487
400
488
401
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
491
403
}
492
404
493
405
ret = gnutls_global_init();
494
406
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
497
409
return -1;
498
410
}
499
411
506
418
}
507
419
508
420
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
510
422
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
513
428
gnutls_global_deinit();
514
429
return -1;
515
430
}
516
431
517
432
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
435
seckeyfilename);
522
436
}
526
440
GNUTLS_OPENPGP_FMT_BASE64);
527
441
if(ret != GNUTLS_E_SUCCESS){
528
442
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
534
447
goto globalfail;
535
448
}
536
449
537
450
/* GnuTLS server initialization */
538
451
ret = gnutls_dh_params_init(&mc.dh_params);
539
452
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
454
" %s\n", safer_gnutls_strerror(ret));
543
455
goto globalfail;
544
456
}
545
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
458
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
460
safer_gnutls_strerror(ret));
550
461
goto globalfail;
551
462
}
565
476
static int init_gnutls_session(gnutls_session_t *session){
566
477
int ret;
567
478
/* 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);
479
ret = gnutls_init(session, GNUTLS_SERVER);
574
480
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
482
safer_gnutls_strerror(ret));
578
483
}
579
484
580
485
{
581
486
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);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
488
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));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
594
492
gnutls_deinit(*session);
595
493
return -1;
596
494
}
597
495
}
598
496
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
607
499
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
501
safer_gnutls_strerror(ret));
611
502
gnutls_deinit(*session);
612
503
return -1;
613
504
}
614
505
615
506
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
617
509
618
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
511
628
520
static int start_mandos_communication(const char *ip, uint16_t port,
629
521
AvahiIfIndex if_index,
630
522
int af){
631
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
632
524
ssize_t sret;
633
525
union {
634
526
struct sockaddr_in in;
635
527
struct sockaddr_in6 in6;
636
528
} to;
637
529
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
639
531
size_t buffer_length = 0;
640
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
641
534
size_t written;
642
int retval = -1;
535
int retval = 0;
643
536
gnutls_session_t session;
644
537
int pf; /* Protocol family */
645
538
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
539
switch(af){
654
540
case AF_INET6:
655
541
pf = PF_INET6;
658
544
pf = PF_INET;
659
545
break;
660
546
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
664
548
return -1;
665
549
}
666
550
670
554
}
671
555
672
556
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
558
"\n", ip, port);
676
559
}
677
560
678
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
562
if(tcp_sd < 0){
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;
563
perror("socket");
564
return -1;
689
565
}
690
566
691
567
memset(&to, 0, sizeof(to));
697
573
ret = inet_pton(af, ip, &to.in.sin_addr);
698
574
}
699
575
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
576
perror("inet_pton");
577
return -1;
704
578
}
705
579
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
711
582
}
712
583
if(af == AF_INET6){
713
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
718
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
590
-Wunreachable-code*/
720
591
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
593
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
594
return -1;
726
595
}
727
596
/* Set the network interface number as scope */
728
597
to.in6.sin6_scope_id = (uint32_t)if_index;
733
602
-Wunreachable-code */
734
603
}
735
604
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
605
if(debug){
742
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
607
char interface[IF_NAMESIZE];
744
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
609
perror("if_indextoname");
746
610
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
612
ip, interface, port);
750
613
}
751
614
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
754
617
}
755
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
626
sizeof(addrstr));
764
627
}
765
628
if(pcret == NULL){
766
perror_plus("inet_ntop");
629
perror("inet_ntop");
767
630
} else {
768
631
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
633
}
772
634
}
773
635
}
774
636
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
637
if(af == AF_INET6){
781
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
639
} else {
783
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
641
}
785
642
if(ret < 0){
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;
643
perror("connect");
644
return -1;
797
645
}
798
646
799
647
const char *out = mandos_protocol_version;
803
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
652
out_size - written));
805
653
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
654
perror("write");
655
retval = -1;
809
656
goto mandos_end;
810
657
}
811
658
written += (size_t)ret;
819
666
break;
820
667
}
821
668
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
669
}
828
670
829
671
if(debug){
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 */
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
840
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
676
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
677
do{
848
678
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
680
855
681
if(ret != GNUTLS_E_SUCCESS){
856
682
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
684
gnutls_perror(ret);
860
685
}
861
errno = EPROTO;
686
retval = -1;
862
687
goto mandos_end;
863
688
}
864
689
865
690
/* Read OpenPGP packet that contains the wanted password */
866
691
867
692
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
870
695
}
871
696
872
697
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
698
buffer_capacity = incbuffer(&buffer, buffer_length,
880
699
buffer_capacity);
881
700
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
890
703
goto mandos_end;
891
704
}
892
705
901
714
case GNUTLS_E_AGAIN:
902
715
break;
903
716
case GNUTLS_E_REHANDSHAKE:
904
do {
717
do{
905
718
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
720
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
722
gnutls_perror(ret);
916
errno = EPROTO;
723
retval = -1;
917
724
goto mandos_end;
918
725
}
919
726
break;
920
727
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
728
fprintf(stderr, "Unknown error while reading data from"
923
729
" encrypted session with Mandos server\n");
730
retval = -1;
924
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
926
732
goto mandos_end;
927
733
}
928
734
} else {
931
737
}
932
738
933
739
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);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
950
744
951
745
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
954
747
buffer_length,
955
748
&decrypted_buffer);
956
749
if(decrypted_buffer_size >= 0){
957
958
750
written = 0;
959
751
while(written < (size_t) decrypted_buffer_size){
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
965
752
ret = (int)fwrite(decrypted_buffer + written, 1,
966
753
(size_t)decrypted_buffer_size - written,
967
754
stdout);
968
755
if(ret == 0 and ferror(stdout)){
969
int e = errno;
970
756
if(debug){
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
757
fprintf(stderr, "Error writing encrypted data: %s\n",
973
758
strerror(errno));
974
759
}
975
errno = e;
976
goto mandos_end;
760
retval = -1;
761
break;
977
762
}
978
763
written += (size_t)ret;
979
764
}
980
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
981
768
}
769
} else {
770
retval = -1;
982
771
}
983
772
984
773
/* Shutdown procedure */
985
774
986
775
mandos_end:
987
{
988
int e = errno;
989
free(decrypted_buffer);
990
free(buffer);
991
if(tcp_sd >= 0){
992
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
993
}
994
if(ret == -1){
995
if(e == 0){
996
e = errno;
997
}
998
perror_plus("close");
999
}
1000
gnutls_deinit(session);
1001
errno = e;
1002
if(quit_now){
1003
errno = EINTR;
1004
retval = -1;
1005
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1006
780
}
781
gnutls_deinit(session);
1007
782
return retval;
1008
783
}
1009
784
1026
801
/* Called whenever a service has been resolved successfully or
1027
802
timed out */
1028
803
1029
if(quit_now){
1030
return;
1031
}
1032
1033
804
switch(event){
1034
805
default:
1035
806
case AVAHI_RESOLVER_FAILURE:
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1038
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
809
avahi_strerror(avahi_server_errno(mc.server)));
1040
810
break;
1044
814
char ip[AVAHI_ADDRESS_STR_MAX];
1045
815
avahi_address_snprint(ip, sizeof(ip), address);
1046
816
if(debug){
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1049
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
819
ip, (intmax_t)interface, port);
1051
820
}
1053
822
avahi_proto_to_af(proto));
1054
823
if(ret == 0){
1055
824
avahi_simple_poll_quit(mc.simple_poll);
1056
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1059
825
}
1060
826
}
1061
827
}
1077
843
/* Called whenever a new services becomes available on the LAN or
1078
844
is removed from the LAN */
1079
845
1080
if(quit_now){
1081
return;
1082
}
1083
1084
846
switch(event){
1085
847
default:
1086
848
case AVAHI_BROWSER_FAILURE:
1087
849
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
850
fprintf(stderr, "(Avahi browser) %s\n",
1090
851
avahi_strerror(avahi_server_errno(mc.server)));
1091
852
avahi_simple_poll_quit(mc.simple_poll);
1092
853
return;
1100
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
862
name, type, domain, protocol, 0,
1102
863
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1105
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1106
866
break;
1107
867
1111
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1113
873
if(debug){
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1116
875
}
1117
876
break;
1118
877
}
1119
878
}
1120
879
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
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){
1123
884
if(quit_now){
1124
885
return;
1125
886
}
1126
887
quit_now = 1;
1127
signal_received = sig;
1128
888
int old_errno = errno;
1129
/* set main loop to exit */
1130
889
if(mc.simple_poll != NULL){
1131
890
avahi_simple_poll_quit(mc.simple_poll);
1132
891
}
1133
892
errno = old_errno;
1134
893
}
1135
894
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1137
int ret;
1138
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
if(s < 0){
1141
perror_plus("socket");
1142
return false;
1143
}
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
if(ret == -1){
1147
if(debug){
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
}
1150
return false;
1151
}
1152
return true;
1153
}
1154
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1170
}
1171
return true;
1172
}
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1178
}
1179
return false;
1180
}
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1183
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1186
}
1187
return false;
1188
}
1189
1190
/* Accept this device */
1191
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1194
}
1195
return true;
1196
}
1197
1198
/*
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1202
*/
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1205
return 0;
1206
}
1207
1208
struct ifreq ifr;
1209
if(not get_flags(if_entry->d_name, &ifr)){
1210
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1268
}
1269
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1276
return 0;
1277
}
1278
return 1;
1279
}
1280
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1283
int ret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1308
if(ret == -1){
1309
if(debug){
1310
perror_plus("Could not stat plugin");
1311
}
1312
return 0;
1313
}
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1316
return 0;
1317
}
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1326
int ret;
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1330
1331
while(true){
1332
if(mc.current_server == NULL){
1333
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1336
}
1337
ret = avahi_simple_poll_iterate(s, -1);
1338
} else {
1339
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1363
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1366
}
1367
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(mc.simple_poll);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1396
}
1397
1398
895
int main(int argc, char *argv[]){
1399
896
AvahiSServiceBrowser *sb = NULL;
1400
897
int error;
1402
899
intmax_t tmpmax;
1403
900
char *tmp;
1404
901
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
902
const char *interface = "eth0";
1406
903
struct ifreq network;
1407
int sd = -1;
1408
bool take_down_interface = false;
904
int sd;
1409
905
uid_t uid;
1410
906
gid_t gid;
907
char *connect_to = NULL;
1411
908
char tempdir[] = "/tmp/mandosXXXXXX";
1412
909
bool tempdir_created = false;
1413
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1417
914
bool gnutls_initialized = false;
1418
915
bool gpgme_initialized = false;
1419
916
float delay = 2.5f;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
1422
917
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1424
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1425
920
1426
uid = getuid();
1427
gid = getgid();
1428
1429
/* Lower any group privileges we might have, just to be safe */
1430
errno = 0;
1431
ret = setgid(gid);
1432
if(ret == -1){
1433
perror_plus("setgid");
1434
}
1435
1436
/* Lower user privileges (temporarily) */
1437
errno = 0;
1438
ret = seteuid(uid);
1439
if(ret == -1){
1440
perror_plus("seteuid");
1441
}
1442
1443
if(quit_now){
1444
goto end;
1445
}
1446
1447
921
{
1448
922
struct argp_option options[] = {
1449
923
{ .name = "debug", .key = 128,
1478
952
.arg = "SECONDS",
1479
953
.doc = "Maximum delay to wait for interface startup",
1480
954
.group = 2 },
1481
{ .name = "retry", .key = 132,
1482
.arg = "SECONDS",
1483
.doc = "Retry interval used when denied by the mandos server",
1484
.group = 2 },
1485
/*
1486
* These reproduce what we would get without ARGP_NO_HELP
1487
*/
1488
{ .name = "help", .key = '?',
1489
.doc = "Give this help list", .group = -1 },
1490
{ .name = "usage", .key = -3,
1491
.doc = "Give a short usage message", .group = -1 },
1492
{ .name = "version", .key = 'V',
1493
.doc = "Print program version", .group = -1 },
1494
955
{ .name = NULL }
1495
956
};
1496
957
1497
958
error_t parse_opt(int key, char *arg,
1498
959
struct argp_state *state){
1499
errno = 0;
1500
960
switch(key){
1501
961
case 128: /* --debug */
1502
962
debug = true;
1518
978
tmpmax = strtoimax(arg, &tmp, 10);
1519
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1520
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1521
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1522
983
}
1523
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1524
985
break;
1529
990
errno = 0;
1530
991
delay = strtof(arg, &tmp);
1531
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1532
argp_error(state, "Bad delay");
1533
}
1534
case 132: /* --retry */
1535
errno = 0;
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1541
995
}
1542
996
break;
1543
/*
1544
* These reproduce what we would get without ARGP_NO_HELP
1545
*/
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1557
1000
break;
1558
1001
default:
1559
1002
return ARGP_ERR_UNKNOWN;
1560
1003
}
1561
return errno;
1004
return 0;
1562
1005
}
1563
1006
1564
1007
struct argp argp = { .options = options, .parser = parse_opt,
1565
1008
.args_doc = "",
1566
1009
.doc = "Mandos client -- Get and decrypt"
1567
1010
" passwords from a Mandos server" };
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1570
switch(ret){
1571
case 0:
1572
break;
1573
case ENOMEM:
1574
default:
1575
errno = ret;
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
case EINVAL:
1580
exitcode = EX_USAGE;
1581
goto end;
1582
}
1583
}
1584
1585
{
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1590
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
} else {
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
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;
1737
1016
}
1738
1017
}
1739
1018
1741
1020
avahi_set_log_function(empty_log);
1742
1021
}
1743
1022
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1774
goto end;
1775
}
1776
}
1777
1778
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
1024
from the signal handler */
1780
1025
/* Initialize the pseudo-RNG for Avahi */
1781
1026
srand((unsigned int) time(NULL));
1782
1027
mc.simple_poll = avahi_simple_poll_new();
1783
1028
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1787
1031
goto end;
1788
1032
}
1789
1033
1790
1034
sigemptyset(&sigterm_action.sa_mask);
1791
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1792
1036
if(ret == -1){
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1795
1039
goto end;
1796
1040
}
1797
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1798
1042
if(ret == -1){
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1801
1045
goto end;
1802
1046
}
1803
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1804
1048
if(ret == -1){
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1807
goto end;
1808
}
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1812
*/
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1814
if(ret == -1){
1815
perror_plus("sigaction");
1816
return EX_OSERR;
1817
}
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1820
if(ret == -1){
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1823
goto end;
1824
}
1825
}
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1827
if(ret == -1){
1828
perror_plus("sigaction");
1829
return EX_OSERR;
1830
}
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1833
if(ret == -1){
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1836
goto end;
1837
}
1838
}
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1840
if(ret == -1){
1841
perror_plus("sigaction");
1842
return EX_OSERR;
1843
}
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1846
if(ret == -1){
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1849
goto end;
1850
}
1851
}
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
}
1852
1059
1853
1060
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1860
goto end;
1861
}
1862
1863
if(quit_now){
1864
goto end;
1865
}
1866
1867
/* Re-raise priviliges */
1868
errno = 0;
1869
ret = seteuid(0);
1870
if(ret == -1){
1871
perror_plus("seteuid");
1872
}
1873
1061
if(interface[0] != '\0'){
1874
1062
#ifdef __linux__
1875
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1877
1065
ret = klogctl(8, NULL, 5);
1878
1066
bool restore_loglevel = true;
1879
1067
if(ret == -1){
1880
1068
restore_loglevel = false;
1881
perror_plus("klogctl");
1069
perror("klogctl");
1882
1070
}
1883
1071
#endif /* __linux__ */
1884
1072
1885
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
1074
if(sd < 0){
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1889
1077
#ifdef __linux__
1890
1078
if(restore_loglevel){
1891
1079
ret = klogctl(7, NULL, 0);
1892
1080
if(ret == -1){
1893
perror_plus("klogctl");
1081
perror("klogctl");
1894
1082
}
1895
1083
}
1896
1084
#endif /* __linux__ */
1897
/* Lower privileges */
1898
errno = 0;
1899
ret = seteuid(uid);
1900
if(ret == -1){
1901
perror_plus("seteuid");
1902
}
1903
1085
goto end;
1904
1086
}
1905
1087
strcpy(network.ifr_name, interface);
1906
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
1089
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1909
1091
#ifdef __linux__
1910
1092
if(restore_loglevel){
1911
1093
ret = klogctl(7, NULL, 0);
1912
1094
if(ret == -1){
1913
perror_plus("klogctl");
1095
perror("klogctl");
1914
1096
}
1915
1097
}
1916
1098
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1099
exitcode = EXIT_FAILURE;
1924
1100
goto end;
1925
1101
}
1926
1102
if((network.ifr_flags & IFF_UP) == 0){
1927
1103
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
1105
if(ret == -1){
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1934
1108
#ifdef __linux__
1935
1109
if(restore_loglevel){
1936
1110
ret = klogctl(7, NULL, 0);
1937
1111
if(ret == -1){
1938
perror_plus("klogctl");
1112
perror("klogctl");
1939
1113
}
1940
1114
}
1941
1115
#endif /* __linux__ */
1942
/* Lower privileges */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
1116
goto end;
1949
1117
}
1950
1118
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1953
1120
for(int i=0; i < delay * 4; i++){
1954
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
1122
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1957
1124
} else if(network.ifr_flags & IFF_RUNNING){
1958
1125
break;
1959
1126
}
1960
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
1128
ret = nanosleep(&sleeptime, NULL);
1962
1129
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1130
perror("nanosleep");
1964
1131
}
1965
1132
}
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
if(ret == -1){
1970
perror_plus("close");
1971
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1972
1136
}
1973
1137
#ifdef __linux__
1974
1138
if(restore_loglevel){
1975
1139
/* Restores kernel loglevel to default */
1976
1140
ret = klogctl(7, NULL, 0);
1977
1141
if(ret == -1){
1978
perror_plus("klogctl");
1142
perror("klogctl");
1979
1143
}
1980
1144
}
1981
1145
#endif /* __linux__ */
1982
/* Lower privileges */
1983
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
1990
} else {
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
1995
}
1996
}
1997
}
1998
1999
if(quit_now){
2000
goto end;
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");
2001
1160
}
2002
1161
2003
1162
ret = init_gnutls_global(pubkey, seckey);
2004
1163
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2008
1166
goto end;
2009
1167
} else {
2010
1168
gnutls_initialized = true;
2011
1169
}
2012
1170
2013
if(quit_now){
2014
goto end;
2015
}
2016
2017
1171
if(mkdtemp(tempdir) == NULL){
2018
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2019
1173
goto end;
2020
1174
}
2021
1175
tempdir_created = true;
2022
1176
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2031
1180
goto end;
2032
1181
} else {
2033
1182
gpgme_initialized = true;
2034
1183
}
2035
1184
2036
if(quit_now){
2037
goto end;
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
}
2038
1192
}
2039
1193
2040
1194
if(connect_to != NULL){
2042
1196
/* (Mainly meant for debugging) */
2043
1197
char *address = strrchr(connect_to, ':');
2044
1198
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2047
exitcode = EX_USAGE;
2048
goto end;
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2055
1203
uint16_t port;
2056
1204
errno = 0;
2057
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2058
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
1207
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2070
1212
port = (uint16_t)tmpmax;
2071
1213
*address = '\0';
1214
address = connect_to;
2072
1215
/* Colon in address indicates IPv6 */
2073
1216
int af;
2074
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2075
1218
af = AF_INET6;
2076
/* Accept [] around IPv6 address - see RFC 5952 */
2077
if(connect_to[0] == '[' and address[-1] == ']')
2078
{
2079
connect_to++;
2080
address[-1] = '\0';
2081
}
2082
1219
} else {
2083
1220
af = AF_INET;
2084
1221
}
2085
address = connect_to;
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
2091
while(not quit_now){
2092
ret = start_mandos_communication(address, port, if_index, af);
2093
if(quit_now or ret == 0){
2094
break;
2095
}
2096
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2099
}
2100
sleep((int)retry_interval);
2101
}
2102
2103
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2104
1226
exitcode = EXIT_SUCCESS;
2105
1227
}
1228
goto end;
1229
}
2106
1230
2107
goto end;
2108
}
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
2114
1231
{
2115
1232
AvahiServerConfig config;
2116
1233
/* Do not publish any local Zeroconf records */
2131
1248
2132
1249
/* Check if creating the Avahi server object succeeded */
2133
1250
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2136
1252
avahi_strerror(error));
2137
exitcode = EX_UNAVAILABLE;
2138
goto end;
2139
}
2140
2141
if(quit_now){
1253
exitcode = EXIT_FAILURE;
2142
1254
goto end;
2143
1255
}
2144
1256
2147
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
1260
NULL, 0, browse_callback, NULL);
2149
1261
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2152
1263
avahi_strerror(avahi_server_errno(mc.server)));
2153
exitcode = EX_UNAVAILABLE;
2154
goto end;
2155
}
2156
2157
if(quit_now){
1264
exitcode = EXIT_FAILURE;
2158
1265
goto end;
2159
1266
}
2160
1267
2161
1268
/* Run the main loop */
2162
1269
2163
1270
if(debug){
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2166
}
2167
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2170
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2174
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2175
1275
2176
1276
end:
2177
1277
2178
1278
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2181
1280
}
2182
1281
2183
1282
/* Cleanup things */
2199
1298
if(gpgme_initialized){
2200
1299
gpgme_release(mc.ctx);
2201
1300
}
2202
2203
/* Cleans up the circular linked list of Mandos servers the client
2204
has seen */
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2211
}
2212
}
2213
2214
/* XXX run network hooks "stop" here */
2215
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2219
errno = 0;
2220
ret = seteuid(0);
2221
if(ret == -1){
2222
perror_plus("seteuid");
2223
}
2224
if(geteuid() == 0){
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2233
}
2234
}
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
if(ret == -1){
2237
perror_plus("close");
2238
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2244
}
2245
}
2246
}
2247
2248
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2249
1303
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2253
alphasort);
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
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
}
2257
1324
char *fullname = NULL;
2258
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2259
1326
direntry->d_name);
2260
1327
if(ret < 0){
2261
perror_plus("asprintf");
1328
perror("asprintf");
2262
1329
continue;
2263
1330
}
2264
1331
ret = remove(fullname);
2265
1332
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2268
1335
}
2269
1336
free(fullname);
2270
1337
}
2271
}
2272
2273
/* need to clean even if 0 because man page doesn't specify */
2274
free(direntries);
2275
if (numentries == -1){
2276
perror_plus("scandir");
1338
closedir(d);
2277
1339
}
2278
1340
ret = rmdir(tempdir);
2279
1341
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
2281
}
2282
}
2283
2284
if(quit_now){
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2289
NULL));
2290
if(ret == -1){
2291
perror_plus("sigaction");
2292
}
2293
do {
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2296
if(ret != 0){
2297
perror_plus("raise");
2298
abort();
2299
}
2300
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2301
1344
}
2302
1345
2303
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0