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- Committer: teddy at bsnet
- Date: 2011-12-24 19:43:48 UTC
- mfrom: (505.1.27 teddy)
- Revision ID: teddy@fukt.bsnet.se-20111224194348-0buonmve2dnwcnzw
Merge from Teddy
- files added:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
135
static const char sys_class_net[] = "/sys/class/net";
131
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
132
138
133
/* Doubly linked list that need to be circular linked when ever used */
139
/* Doubly linked list that need to be circularly linked when used */
134
140
typedef struct server{
135
141
const char *ip;
136
142
uint16_t port;
156
162
/* global context so signal handler can reach it*/
157
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
164
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
160
167
161
168
sig_atomic_t quit_now = 0;
162
169
int signal_received = 0;
163
170
164
171
/* Function to use when printing errors */
165
172
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
167
175
perror(print_text);
168
176
}
169
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
170
187
/*
171
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
189
* bytes. "buffer_capacity" is how much is currently allocated,
173
190
* "buffer_length" is how much is already used.
174
191
*/
175
192
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
193
size_t buffer_capacity){
177
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
196
if(buffer == NULL){
184
201
return buffer_capacity;
185
202
}
186
203
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
204
/* Add server to set of servers to retry periodically */
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
190
207
int ret;
191
208
server *new_server = malloc(sizeof(server));
192
209
if(new_server == NULL){
193
210
perror_plus("malloc");
194
return -1;
211
return false;
195
212
}
196
213
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
214
.port = port,
215
.if_index = if_index,
216
.af = af };
200
217
if(new_server->ip == NULL){
201
218
perror_plus("strdup");
202
return -1;
219
return false;
203
220
}
204
/* uniqe case of first server */
221
/* Special case of first server */
205
222
if (mc.current_server == NULL){
206
223
new_server->next = new_server;
207
224
new_server->prev = new_server;
208
225
mc.current_server = new_server;
209
/* Placing the new server last in the list */
226
/* Place the new server last in the list */
210
227
} else {
211
228
new_server->next = mc.current_server;
212
229
new_server->prev = mc.current_server->prev;
216
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
234
if(ret == -1){
218
235
perror_plus("clock_gettime");
219
return -1;
236
return false;
220
237
}
221
return 0;
238
return true;
222
239
}
223
240
224
241
/*
225
242
* Initialize GPGME.
226
243
*/
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
229
246
gpgme_error_t rc;
230
247
gpgme_engine_info_t engine_info;
231
248
246
263
247
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
265
if(rc != GPG_ERR_NO_ERROR){
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
251
268
return false;
252
269
}
253
270
254
271
rc = gpgme_op_import(mc.ctx, pgp_data);
255
272
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
258
275
return false;
259
276
}
260
277
267
284
}
268
285
269
286
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
271
288
}
272
289
273
290
/* Init GPGME */
274
291
gpgme_check_version(NULL);
275
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
276
293
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
279
296
return false;
280
297
}
281
298
282
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
283
300
rc = gpgme_get_engine_info(&engine_info);
284
301
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
287
304
return false;
288
305
}
289
306
while(engine_info != NULL){
295
312
engine_info = engine_info->next;
296
313
}
297
314
if(engine_info == NULL){
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
299
317
return false;
300
318
}
301
319
302
320
/* Create new GPGME "context" */
303
321
rc = gpgme_new(&(mc.ctx));
304
322
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
307
326
return false;
308
327
}
309
328
328
347
ssize_t plaintext_length = 0;
329
348
330
349
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
332
351
}
333
352
334
353
/* Create new GPGME data buffer from memory cryptotext */
335
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
355
0);
337
356
if(rc != GPG_ERR_NO_ERROR){
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
340
359
return -1;
341
360
}
342
361
343
362
/* Create new empty GPGME data buffer for the plaintext */
344
363
rc = gpgme_data_new(&dh_plain);
345
364
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
348
368
gpgme_data_release(dh_crypto);
349
369
return -1;
350
370
}
353
373
data buffer */
354
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
355
375
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
358
378
plaintext_length = -1;
359
379
if(debug){
360
380
gpgme_decrypt_result_t result;
361
381
result = gpgme_op_decrypt_result(mc.ctx);
362
382
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
364
384
} else {
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
369
389
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
371
391
}
372
392
gpgme_recipient_t recipient;
373
393
recipient = result->recipients;
374
394
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
381
402
recipient = recipient->next;
382
403
}
383
404
}
386
407
}
387
408
388
409
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
390
411
}
391
412
392
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
399
420
*plaintext = NULL;
400
421
while(true){
401
422
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
404
425
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
408
429
}
409
430
410
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
423
444
}
424
445
425
446
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
427
448
for(ssize_t i = 0; i < plaintext_length; i++){
428
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
450
}
451
472
/* GnuTLS log function callback */
452
473
static void debuggnutls(__attribute__((unused)) int level,
453
474
const char* string){
454
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
455
476
}
456
477
457
478
static int init_gnutls_global(const char *pubkeyfilename,
459
480
int ret;
460
481
461
482
if(debug){
462
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
463
484
}
464
485
465
486
ret = gnutls_global_init();
466
487
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
469
490
return -1;
470
491
}
471
492
478
499
}
479
500
480
501
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
482
503
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
488
506
gnutls_global_deinit();
489
507
return -1;
490
508
}
491
509
492
510
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
496
515
}
497
516
498
517
ret = gnutls_certificate_set_openpgp_key_file
499
518
(mc.cred, pubkeyfilename, seckeyfilename,
500
519
GNUTLS_OPENPGP_FMT_BASE64);
501
520
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
507
526
goto globalfail;
508
527
}
509
528
510
529
/* GnuTLS server initialization */
511
530
ret = gnutls_dh_params_init(&mc.dh_params);
512
531
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
515
535
goto globalfail;
516
536
}
517
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
538
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
521
541
goto globalfail;
522
542
}
523
543
543
563
}
544
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
565
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
548
569
}
549
570
550
571
{
557
578
}
558
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
580
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
563
584
gnutls_deinit(*session);
564
585
return -1;
565
586
}
574
595
}
575
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
597
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
579
600
gnutls_deinit(*session);
580
601
return -1;
581
602
}
626
647
pf = PF_INET;
627
648
break;
628
649
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
651
errno = EINVAL;
631
652
return -1;
632
653
}
637
658
}
638
659
639
660
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
642
663
}
643
664
644
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
691
}
671
692
if(ret == 0){
672
693
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
695
errno = e;
675
696
goto mandos_end;
676
697
}
681
702
682
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
705
-Wunreachable-code*/
685
706
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
688
709
errno = EINVAL;
689
710
goto mandos_end;
690
711
}
708
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
730
perror_plus("if_indextoname");
710
731
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
713
734
}
714
735
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
717
738
}
718
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
750
perror_plus("inet_ntop");
730
751
} else {
731
752
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
754
}
734
755
}
735
756
}
763
784
while(true){
764
785
size_t out_size = strlen(out);
765
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
787
out_size - written));
767
788
if(ret == -1){
768
789
int e = errno;
769
790
perror_plus("write");
789
810
}
790
811
791
812
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
814
}
794
815
795
816
if(quit_now){
796
817
errno = EINTR;
797
818
goto mandos_end;
798
819
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
820
821
/* Spurious warning from -Wint-to-pointer-cast */
801
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
823
803
824
if(quit_now){
815
836
816
837
if(ret != GNUTLS_E_SUCCESS){
817
838
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
840
gnutls_perror(ret);
820
841
}
821
842
errno = EPROTO;
825
846
/* Read OpenPGP packet that contains the wanted password */
826
847
827
848
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
830
851
}
831
852
832
853
while(true){
837
858
}
838
859
839
860
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
861
buffer_capacity);
841
862
if(buffer_capacity == 0){
842
863
int e = errno;
843
864
perror_plus("incbuffer");
870
891
}
871
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
893
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
874
896
gnutls_perror(ret);
875
897
errno = EPROTO;
876
898
goto mandos_end;
877
899
}
878
900
break;
879
901
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
882
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
905
errno = EIO;
884
906
goto mandos_end;
889
911
}
890
912
891
913
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
893
915
}
894
916
895
917
if(quit_now){
907
929
908
930
if(buffer_length > 0){
909
931
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
933
&decrypted_buffer);
913
934
if(decrypted_buffer_size >= 0){
914
935
925
946
if(ret == 0 and ferror(stdout)){
926
947
int e = errno;
927
948
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
930
951
}
931
952
errno = e;
932
953
goto mandos_end;
989
1010
switch(event){
990
1011
default:
991
1012
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
995
1017
break;
996
1018
997
1019
case AVAHI_RESOLVER_FOUND:
999
1021
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1022
avahi_address_snprint(ip, sizeof(ip), address);
1001
1023
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
1005
1027
}
1006
1028
int ret = start_mandos_communication(ip, port, interface,
1007
1029
avahi_proto_to_af(proto));
1008
1030
if(ret == 0){
1009
1031
avahi_simple_poll_quit(mc.simple_poll);
1010
1032
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
" list\n", name);
1037
}
1013
1038
}
1014
1039
}
1015
1040
}
1039
1064
default:
1040
1065
case AVAHI_BROWSER_FAILURE:
1041
1066
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1044
1069
avahi_simple_poll_quit(mc.simple_poll);
1045
1070
return;
1046
1071
1053
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1079
name, type, domain, protocol, 0,
1055
1080
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
1058
1084
break;
1059
1085
1060
1086
case AVAHI_BROWSER_REMOVE:
1063
1089
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1090
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1091
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
1067
1094
}
1068
1095
break;
1069
1096
}
1070
1097
}
1071
1098
1072
/* Signal handler that stops main loop after sigterm has been called */
1099
/* Signal handler that stops main loop after SIGTERM */
1073
1100
static void handle_sigterm(int sig){
1074
1101
if(quit_now){
1075
1102
return;
1084
1111
errno = old_errno;
1085
1112
}
1086
1113
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
int ret;
1116
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
if(s < 0){
1119
perror_plus("socket");
1120
return false;
1121
}
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
if(ret == -1){
1143
1125
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1126
perror_plus("ioctl SIOCGIFFLAGS");
1146
1127
}
1147
free(flagstring);
1148
return 0;
1128
return false;
1149
1129
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1130
return true;
1131
}
1132
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1152
1135
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1137
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
ifname);
1157
1140
}
1158
return 0;
1141
return false;
1159
1142
}
1160
1143
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1145
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1165
1148
}
1166
return 1;
1149
return true;
1167
1150
}
1168
1151
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1153
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1173
1156
}
1174
return 0;
1157
return false;
1175
1158
}
1176
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1160
if(ifr->ifr_flags & IFF_NOARP){
1178
1161
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1163
ifname);
1181
1164
}
1182
return 0;
1165
return false;
1183
1166
}
1167
1184
1168
/* Accept this device */
1185
1169
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1171
}
1172
return true;
1173
}
1174
1175
/*
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1179
*/
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1182
return 0;
1183
}
1184
1185
struct ifreq ifr;
1186
if(not get_flags(if_entry->d_name, &ifr)){
1187
if(debug){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1190
}
1191
return 0;
1192
}
1193
1194
if(not good_flags(if_entry->d_name, &ifr)){
1195
return 0;
1196
}
1197
return 1;
1198
}
1199
1200
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1188
1239
}
1189
1240
return 1;
1190
1241
}
1200
1251
return 1;
1201
1252
}
1202
1253
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1256
int ret;
1257
size_t sret;
1258
struct stat st;
1259
1260
if((direntry->d_name)[0] == '\0'){
1261
/* Empty name? */
1262
return 0;
1263
}
1264
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1267
"0123456789"
1268
"_-");
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1271
if(debug){
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1273
direntry->d_name);
1274
}
1275
return 0;
1276
}
1277
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1286
if(ret == -1){
1287
if(debug){
1288
perror_plus("Could not stat hook");
1289
}
1290
return 0;
1291
}
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1294
if(debug){
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
direntry->d_name);
1297
}
1298
return 0;
1299
}
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(debug){
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1310
direntry->d_name);
1311
}
1312
return 1;
1313
}
1314
1203
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1316
int ret;
1205
1317
struct timespec now;
1206
1318
struct timespec waited_time;
1207
1319
intmax_t block_time;
1208
1320
1209
1321
while(true){
1210
1322
if(mc.current_server == NULL){
1211
1323
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1324
fprintf_plus(stderr, "Wait until first server is found."
1325
" No timeout!\n");
1213
1326
}
1214
1327
ret = avahi_simple_poll_iterate(s, -1);
1215
1328
} else {
1216
1329
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1330
fprintf_plus(stderr, "Check current_server if we should run"
1331
" it, or wait\n");
1218
1332
}
1219
1333
/* the current time */
1220
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
1338
}
1225
1339
/* Calculating in ms how long time between now and server
1226
1340
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1341
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1343
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1345
/* total time is 10s/10,000ms.
1346
Converting to s from ms by dividing by 1,000,
1347
and ns to ms by dividing by 1,000,000. */
1348
block_time = ((retry_interval
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1351
1232
1352
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
block_time);
1234
1355
}
1235
1356
1236
1357
if(block_time <= 0){
1237
1358
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1241
1362
if(ret == 0){
1242
1363
avahi_simple_poll_quit(mc.simple_poll);
1243
1364
return 0;
1244
1365
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1246
1368
if(ret == -1){
1247
1369
perror_plus("clock_gettime");
1248
1370
return -1;
1249
1371
}
1250
1372
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1373
block_time = 0; /* Call avahi to find new Mandos
1374
servers, but don't block */
1252
1375
}
1253
1376
1254
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
1378
}
1256
1379
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1380
if (ret > 0 or errno != EINTR){
1258
1381
return (ret != 1) ? ret : 0;
1259
1382
}
1260
1383
}
1261
1384
}
1262
1385
}
1263
1386
1387
bool run_network_hooks(const char *mode, const char *interface,
1388
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1394
if(numhooks == -1){
1395
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1403
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1472
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
1513
1264
1514
int main(int argc, char *argv[]){
1265
1515
AvahiSServiceBrowser *sb = NULL;
1266
1516
int error;
1283
1533
bool gnutls_initialized = false;
1284
1534
bool gpgme_initialized = false;
1285
1535
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
1287
1538
1288
1539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
1540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1347
1598
.arg = "SECONDS",
1348
1599
.doc = "Retry interval used when denied by the mandos server",
1349
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1350
1605
/*
1351
1606
* These reproduce what we would get without ARGP_NO_HELP
1352
1607
*/
1400
1655
errno = 0;
1401
1656
retry_interval = strtod(arg, &tmp);
1402
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1404
1660
argp_error(state, "Bad retry interval");
1405
1661
}
1406
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1407
1666
/*
1408
1667
* These reproduce what we would get without ARGP_NO_HELP
1409
1668
*/
1415
1674
argp_state_help(state, state->out_stream,
1416
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
1676
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1677
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
1678
exit(argp_err_exit_status);
1420
1679
break;
1421
1680
default:
1444
1703
goto end;
1445
1704
}
1446
1705
}
1706
1707
{
1708
/* Work around Debian bug #633582:
1709
<http://bugs.debian.org/633582> */
1710
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
1716
} else {
1717
struct stat st;
1718
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1723
} else {
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
if(ret == -1){
1726
perror_plus("fstat");
1727
} else {
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1752
if(ret == -1){
1753
perror_plus("fchown");
1754
}
1755
}
1756
}
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
1761
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
1766
}
1767
}
1768
}
1769
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
1773
}
1447
1774
1448
1775
if(not debug){
1449
1776
avahi_set_log_function(empty_log);
1450
1777
}
1451
1778
1452
1779
if(interface[0] == '\0'){
1453
1780
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1455
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1456
1790
if(ret >= 1){
1457
/* Pick the first good interface */
1791
/* Pick the first interface returned */
1458
1792
interface = strdup(direntries[0]->d_name);
1459
1793
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1461
1795
}
1462
1796
if(interface == NULL){
1463
1797
perror_plus("malloc");
1468
1802
free(direntries);
1469
1803
} else {
1470
1804
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1472
1806
exitcode = EXIT_FAILURE;
1473
1807
goto end;
1474
1808
}
1480
1814
srand((unsigned int) time(NULL));
1481
1815
mc.simple_poll = avahi_simple_poll_new();
1482
1816
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1484
1819
exitcode = EX_UNAVAILABLE;
1485
1820
goto end;
1486
1821
}
1552
1887
if(strcmp(interface, "none") != 0){
1553
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
1889
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1556
1891
exitcode = EX_UNAVAILABLE;
1557
1892
goto end;
1558
1893
}
1645
1980
goto end;
1646
1981
}
1647
1982
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1649
1985
for(int i=0; i < delay * 4; i++){
1650
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
1987
if(ret == -1){
1677
2013
#endif /* __linux__ */
1678
2014
/* Lower privileges */
1679
2015
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
1692
2020
}
1693
2021
}
1694
2022
1698
2026
1699
2027
ret = init_gnutls_global(pubkey, seckey);
1700
2028
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2030
exitcode = EX_UNAVAILABLE;
1703
2031
goto end;
1704
2032
} else {
1720
2048
}
1721
2049
1722
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2051
fprintf_plus(stderr, "init_gpgme failed\n");
1724
2052
exitcode = EX_UNAVAILABLE;
1725
2053
goto end;
1726
2054
} else {
1736
2064
/* (Mainly meant for debugging) */
1737
2065
char *address = strrchr(connect_to, ':');
1738
2066
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
2067
fprintf_plus(stderr, "No colon in address\n");
1740
2068
exitcode = EX_USAGE;
1741
2069
goto end;
1742
2070
}
1750
2078
tmpmax = strtoimax(address+1, &tmp, 10);
1751
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
2080
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2081
fprintf_plus(stderr, "Bad port number\n");
1754
2082
exitcode = EX_USAGE;
1755
2083
goto end;
1756
2084
}
1761
2089
1762
2090
port = (uint16_t)tmpmax;
1763
2091
*address = '\0';
1764
address = connect_to;
1765
2092
/* Colon in address indicates IPv6 */
1766
2093
int af;
1767
if(strchr(address, ':') != NULL){
2094
if(strchr(connect_to, ':') != NULL){
1768
2095
af = AF_INET6;
2096
/* Accept [] around IPv6 address - see RFC 5952 */
2097
if(connect_to[0] == '[' and address[-1] == ']')
2098
{
2099
connect_to++;
2100
address[-1] = '\0';
2101
}
1769
2102
} else {
1770
2103
af = AF_INET;
1771
2104
}
2105
address = connect_to;
1772
2106
1773
2107
if(quit_now){
1774
2108
goto end;
1775
2109
}
1776
2110
1777
2111
while(not quit_now){
1778
2112
ret = start_mandos_communication(address, port, if_index, af);
1779
2113
if(quit_now or ret == 0){
1780
2114
break;
1781
2115
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
2116
if(debug){
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
(int)retry_interval);
2119
}
2120
sleep((int)retry_interval);
2121
}
2122
1785
2123
if (not quit_now){
1786
2124
exitcode = EXIT_SUCCESS;
1787
2125
}
1788
2126
1789
2127
goto end;
1790
2128
}
1791
2129
1813
2151
1814
2152
/* Check if creating the Avahi server object succeeded */
1815
2153
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
1818
2156
exitcode = EX_UNAVAILABLE;
1819
2157
goto end;
1820
2158
}
1828
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
2167
NULL, 0, browse_callback, NULL);
1830
2168
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
avahi_strerror(avahi_server_errno(mc.server)));
1833
2171
exitcode = EX_UNAVAILABLE;
1834
2172
goto end;
1835
2173
}
1841
2179
/* Run the main loop */
1842
2180
1843
2181
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
2183
}
1846
2184
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
1848
2187
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
(ret == 0) ? "successfully" : "with error");
1851
2190
}
1852
2191
1853
2192
end:
1854
2193
1855
2194
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2195
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1857
2196
}
1858
2197
1859
2198
/* Cleanup things */
1875
2214
if(gpgme_initialized){
1876
2215
gpgme_release(mc.ctx);
1877
2216
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
1880
2220
if(mc.current_server != NULL){
1881
2221
mc.current_server->prev->next = NULL;
1882
2222
while(mc.current_server != NULL){
1886
2226
}
1887
2227
}
1888
2228
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2233
{
1892
2234
errno = 0;
1893
2235
ret = seteuid(0);
1894
2236
if(ret == -1){
1895
2237
perror_plus("seteuid");
1896
2238
}
1897
if(geteuid() == 0){
2239
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
1898
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
2243
if(ret == -1){
1900
2244
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
2245
} else if(network.ifr_flags & IFF_UP){
1902
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
2248
if(ret == -1){
1909
2253
if(ret == -1){
1910
2254
perror_plus("close");
1911
2255
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
2256
}
1919
2257
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
1920
2264
1921
2265
/* Removes the GPGME temp directory and all files inside */
1922
2266
if(tempdir_created){
1923
2267
struct dirent **direntries = NULL;
1924
2268
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
1928
2273
direntry = direntries[i];
1929
2274
char *fullname = NULL;
1930
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
1935
2280
}
1936
2281
ret = remove(fullname);
1937
2282
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
1940
2285
}
1941
2286
free(fullname);
1942
2287
}
1943
2288
}
1944
2289
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
2290
/* need to clean even if 0 because man page doesn't specify */
1946
2291
free(direntries);
1947
if (ret == -1){
2292
if (numentries == -1){
1948
2293
perror_plus("scandir");
1949
2294
}
1950
2295
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0