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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- 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(),
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
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() */
87
90
88
91
#ifdef __linux__
89
92
#include <sys/klog.h> /* klogctl() */
107
110
init_gnutls_session(),
108
111
GNUTLS_* */
109
112
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
112
115
113
116
/* GPGME */
114
117
#include <gpgme.h> /* All GPGME types, constants and
122
125
#define PATHDIR "/conf/conf.d/mandos"
123
126
#define SECKEY "seckey.txt"
124
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
129
126
130
bool debug = false;
127
131
static const char mandos_protocol_version[] = "1";
128
132
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
134
static const char sys_class_net[] = "/sys/class/net";
131
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
132
137
133
/* Doubly linked list that need to be circular linked when ever used */
138
/* Doubly linked list that need to be circularly linked when used */
134
139
typedef struct server{
135
140
const char *ip;
136
141
uint16_t port;
156
161
/* global context so signal handler can reach it*/
157
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
163
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
160
166
161
167
sig_atomic_t quit_now = 0;
162
168
int signal_received = 0;
163
169
164
170
/* Function to use when printing errors */
165
171
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
167
174
perror(print_text);
168
175
}
169
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
185
170
186
/*
171
187
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
188
* bytes. "buffer_capacity" is how much is currently allocated,
173
189
* "buffer_length" is how much is already used.
174
190
*/
175
191
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
192
size_t buffer_capacity){
177
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
195
if(buffer == NULL){
184
200
return buffer_capacity;
185
201
}
186
202
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
190
206
int ret;
191
207
server *new_server = malloc(sizeof(server));
192
208
if(new_server == NULL){
194
210
return -1;
195
211
}
196
212
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
213
.port = port,
214
.if_index = if_index,
215
.af = af };
200
216
if(new_server->ip == NULL){
201
217
perror_plus("strdup");
202
return -1;
218
return -1;
203
219
}
204
/* uniqe case of first server */
220
/* Special case of first server */
205
221
if (mc.current_server == NULL){
206
222
new_server->next = new_server;
207
223
new_server->prev = new_server;
208
224
mc.current_server = new_server;
209
/* Placing the new server last in the list */
225
/* Place the new server last in the list */
210
226
} else {
211
227
new_server->next = mc.current_server;
212
228
new_server->prev = mc.current_server->prev;
224
240
/*
225
241
* Initialize GPGME.
226
242
*/
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
229
245
gpgme_error_t rc;
230
246
gpgme_engine_info_t engine_info;
231
247
246
262
247
263
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
264
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));
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
251
267
return false;
252
268
}
253
269
254
270
rc = gpgme_op_import(mc.ctx, pgp_data);
255
271
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
258
274
return false;
259
275
}
260
276
267
283
}
268
284
269
285
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
286
fprintf_plus(stderr, "Initializing GPGME\n");
271
287
}
272
288
273
289
/* Init GPGME */
274
290
gpgme_check_version(NULL);
275
291
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
276
292
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
279
295
return false;
280
296
}
281
297
282
/* Set GPGME home directory for the OpenPGP engine only */
298
/* Set GPGME home directory for the OpenPGP engine only */
283
299
rc = gpgme_get_engine_info(&engine_info);
284
300
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
287
303
return false;
288
304
}
289
305
while(engine_info != NULL){
295
311
engine_info = engine_info->next;
296
312
}
297
313
if(engine_info == NULL){
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
299
316
return false;
300
317
}
301
318
302
319
/* Create new GPGME "context" */
303
320
rc = gpgme_new(&(mc.ctx));
304
321
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
307
325
return false;
308
326
}
309
327
328
346
ssize_t plaintext_length = 0;
329
347
330
348
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
332
350
}
333
351
334
352
/* Create new GPGME data buffer from memory cryptotext */
335
353
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
354
0);
337
355
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));
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
340
358
return -1;
341
359
}
342
360
343
361
/* Create new empty GPGME data buffer for the plaintext */
344
362
rc = gpgme_data_new(&dh_plain);
345
363
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
348
367
gpgme_data_release(dh_crypto);
349
368
return -1;
350
369
}
353
372
data buffer */
354
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
355
374
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
358
377
plaintext_length = -1;
359
378
if(debug){
360
379
gpgme_decrypt_result_t result;
361
380
result = gpgme_op_decrypt_result(mc.ctx);
362
381
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
364
383
} 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);
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
369
388
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
371
390
}
372
391
gpgme_recipient_t recipient;
373
392
recipient = result->recipients;
374
393
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");
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
381
401
recipient = recipient->next;
382
402
}
383
403
}
386
406
}
387
407
388
408
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
390
410
}
391
411
392
412
/* Seek back to the beginning of the GPGME plaintext data buffer */
399
419
*plaintext = NULL;
400
420
while(true){
401
421
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
422
(size_t)plaintext_length,
423
plaintext_capacity);
404
424
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
408
428
}
409
429
410
430
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
423
443
}
424
444
425
445
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
446
fprintf_plus(stderr, "Decrypted password is: ");
427
447
for(ssize_t i = 0; i < plaintext_length; i++){
428
448
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
449
}
451
471
/* GnuTLS log function callback */
452
472
static void debuggnutls(__attribute__((unused)) int level,
453
473
const char* string){
454
fprintf(stderr, "GnuTLS: %s", string);
474
fprintf_plus(stderr, "GnuTLS: %s", string);
455
475
}
456
476
457
477
static int init_gnutls_global(const char *pubkeyfilename,
459
479
int ret;
460
480
461
481
if(debug){
462
fprintf(stderr, "Initializing GnuTLS\n");
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
463
483
}
464
484
465
485
ret = gnutls_global_init();
466
486
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
469
489
return -1;
470
490
}
471
491
478
498
}
479
499
480
500
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
482
502
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));
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
488
505
gnutls_global_deinit();
489
506
return -1;
490
507
}
491
508
492
509
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
496
514
}
497
515
498
516
ret = gnutls_certificate_set_openpgp_key_file
499
517
(mc.cred, pubkeyfilename, seckeyfilename,
500
518
GNUTLS_OPENPGP_FMT_BASE64);
501
519
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));
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
507
525
goto globalfail;
508
526
}
509
527
510
528
/* GnuTLS server initialization */
511
529
ret = gnutls_dh_params_init(&mc.dh_params);
512
530
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
515
534
goto globalfail;
516
535
}
517
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
537
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
521
540
goto globalfail;
522
541
}
523
542
543
562
}
544
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
564
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
548
568
}
549
569
550
570
{
557
577
}
558
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
579
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));
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
563
583
gnutls_deinit(*session);
564
584
return -1;
565
585
}
574
594
}
575
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
596
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
579
599
gnutls_deinit(*session);
580
600
return -1;
581
601
}
626
646
pf = PF_INET;
627
647
break;
628
648
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
650
errno = EINVAL;
631
651
return -1;
632
652
}
637
657
}
638
658
639
659
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
642
662
}
643
663
644
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
690
}
671
691
if(ret == 0){
672
692
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
694
errno = e;
675
695
goto mandos_end;
676
696
}
681
701
682
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
704
-Wunreachable-code*/
685
705
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
688
708
errno = EINVAL;
689
709
goto mandos_end;
690
710
}
708
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
729
perror_plus("if_indextoname");
710
730
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
713
733
}
714
734
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
717
737
}
718
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
749
perror_plus("inet_ntop");
730
750
} else {
731
751
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
753
}
734
754
}
735
755
}
763
783
while(true){
764
784
size_t out_size = strlen(out);
765
785
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
786
out_size - written));
767
787
if(ret == -1){
768
788
int e = errno;
769
789
perror_plus("write");
789
809
}
790
810
791
811
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
813
}
794
814
795
815
if(quit_now){
796
816
errno = EINTR;
797
817
goto mandos_end;
798
818
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
819
820
/* Spurious warning from -Wint-to-pointer-cast */
801
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
822
803
823
if(quit_now){
815
835
816
836
if(ret != GNUTLS_E_SUCCESS){
817
837
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
839
gnutls_perror(ret);
820
840
}
821
841
errno = EPROTO;
825
845
/* Read OpenPGP packet that contains the wanted password */
826
846
827
847
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
830
850
}
831
851
832
852
while(true){
837
857
}
838
858
839
859
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
860
buffer_capacity);
841
861
if(buffer_capacity == 0){
842
862
int e = errno;
843
863
perror_plus("incbuffer");
870
890
}
871
891
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
892
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
874
895
gnutls_perror(ret);
875
896
errno = EPROTO;
876
897
goto mandos_end;
877
898
}
878
899
break;
879
900
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
882
903
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
904
errno = EIO;
884
905
goto mandos_end;
889
910
}
890
911
891
912
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
913
fprintf_plus(stderr, "Closing TLS session\n");
893
914
}
894
915
895
916
if(quit_now){
907
928
908
929
if(buffer_length > 0){
909
930
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
932
&decrypted_buffer);
913
933
if(decrypted_buffer_size >= 0){
914
934
925
945
if(ret == 0 and ferror(stdout)){
926
946
int e = errno;
927
947
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
930
950
}
931
951
errno = e;
932
952
goto mandos_end;
989
1009
switch(event){
990
1010
default:
991
1011
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)));
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
995
1016
break;
996
1017
997
1018
case AVAHI_RESOLVER_FOUND:
999
1020
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1021
avahi_address_snprint(ip, sizeof(ip), address);
1001
1022
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);
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
1005
1026
}
1006
1027
int ret = start_mandos_communication(ip, port, interface,
1007
1028
avahi_proto_to_af(proto));
1039
1060
default:
1040
1061
case AVAHI_BROWSER_FAILURE:
1041
1062
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1044
1065
avahi_simple_poll_quit(mc.simple_poll);
1045
1066
return;
1046
1067
1053
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1075
name, type, domain, protocol, 0,
1055
1076
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1058
1080
break;
1059
1081
1060
1082
case AVAHI_BROWSER_REMOVE:
1063
1085
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1086
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1087
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
1067
1090
}
1068
1091
break;
1069
1092
}
1070
1093
}
1071
1094
1072
/* Signal handler that stops main loop after sigterm has been called */
1095
/* Signal handler that stops main loop after SIGTERM */
1073
1096
static void handle_sigterm(int sig){
1074
1097
if(quit_now){
1075
1098
return;
1084
1107
errno = old_errno;
1085
1108
}
1086
1109
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){
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1143
1121
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1122
perror_plus("ioctl SIOCGIFFLAGS");
1146
1123
}
1147
free(flagstring);
1148
return 0;
1124
return false;
1149
1125
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1152
1131
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1133
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1157
1136
}
1158
return 0;
1137
return false;
1159
1138
}
1160
1139
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1141
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1165
1144
}
1166
return 1;
1145
return true;
1167
1146
}
1168
1147
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1149
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1173
1152
}
1174
return 0;
1153
return false;
1175
1154
}
1176
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1156
if(ifr->ifr_flags & IFF_NOARP){
1178
1157
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1181
1160
}
1182
return 0;
1161
return false;
1183
1162
}
1163
1184
1164
/* Accept this device */
1185
1165
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1188
1235
}
1189
1236
return 1;
1190
1237
}
1200
1247
return 1;
1201
1248
}
1202
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
1203
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1308
int ret;
1205
1309
struct timespec now;
1206
1310
struct timespec waited_time;
1207
1311
intmax_t block_time;
1208
1312
1209
1313
while(true){
1210
1314
if(mc.current_server == NULL){
1211
1315
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1316
fprintf_plus(stderr, "Wait until first server is found."
1317
" No timeout!\n");
1213
1318
}
1214
1319
ret = avahi_simple_poll_iterate(s, -1);
1215
1320
} else {
1216
1321
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1322
fprintf_plus(stderr, "Check current_server if we should run"
1323
" it, or wait\n");
1218
1324
}
1219
1325
/* the current time */
1220
1326
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
1330
}
1225
1331
/* Calculating in ms how long time between now and server
1226
1332
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
1333
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1335
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1337
/* total time is 10s/10,000ms.
1338
Converting to s from ms by dividing by 1,000,
1339
and ns to ms by dividing by 1,000,000. */
1340
block_time = ((retry_interval
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1232
1344
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
block_time);
1234
1347
}
1235
1348
1236
1349
if(block_time <= 0){
1237
1350
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1241
1354
if(ret == 0){
1242
1355
avahi_simple_poll_quit(mc.simple_poll);
1243
1356
return 0;
1244
1357
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1246
1360
if(ret == -1){
1247
1361
perror_plus("clock_gettime");
1248
1362
return -1;
1249
1363
}
1250
1364
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1365
block_time = 0; /* Call avahi to find new Mandos
1366
servers, but don't block */
1252
1367
}
1253
1368
1254
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
1370
}
1256
1371
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1372
if (ret > 0 or errno != EINTR){
1258
1373
return (ret != 1) ? ret : 0;
1259
1374
}
1260
1375
}
1261
1376
}
1262
1377
}
1263
1378
1379
bool run_network_hooks(const char *mode, const char *interface,
1380
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1386
if(numhooks == -1){
1387
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1395
perror_plus("asprintf");
1396
continue;
1397
}
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1436
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
1475
}
1476
1264
1477
int main(int argc, char *argv[]){
1265
1478
AvahiSServiceBrowser *sb = NULL;
1266
1479
int error;
1283
1496
bool gnutls_initialized = false;
1284
1497
bool gpgme_initialized = false;
1285
1498
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1499
double retry_interval = 10; /* 10s between trying a server and
1500
retrying the same server again */
1287
1501
1288
1502
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
1503
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1347
1561
.arg = "SECONDS",
1348
1562
.doc = "Retry interval used when denied by the mandos server",
1349
1563
.group = 2 },
1564
{ .name = "network-hook-dir", .key = 133,
1565
.arg = "DIR",
1566
.doc = "Directory where network hooks are located",
1567
.group = 2 },
1350
1568
/*
1351
1569
* These reproduce what we would get without ARGP_NO_HELP
1352
1570
*/
1400
1618
errno = 0;
1401
1619
retry_interval = strtod(arg, &tmp);
1402
1620
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1621
or (retry_interval * 1000) > INT_MAX
1622
or retry_interval < 0){
1404
1623
argp_error(state, "Bad retry interval");
1405
1624
}
1406
1625
break;
1626
case 133: /* --network-hook-dir */
1627
hookdir = arg;
1628
break;
1407
1629
/*
1408
1630
* These reproduce what we would get without ARGP_NO_HELP
1409
1631
*/
1415
1637
argp_state_help(state, state->out_stream,
1416
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
1639
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
1643
exit(argp_err_exit_status);
1420
1644
break;
1421
1645
default:
1444
1668
goto end;
1445
1669
}
1446
1670
}
1671
1672
{
1673
/* Work around Debian bug #633582:
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
}
1732
}
1733
1734
/* Run network hooks */
1735
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
1751
}
1447
1752
1448
1753
if(not debug){
1449
1754
avahi_set_log_function(empty_log);
1450
1755
}
1451
1756
1452
1757
if(interface[0] == '\0'){
1453
1758
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1455
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1456
1768
if(ret >= 1){
1457
/* Pick the first good interface */
1769
/* Pick the first interface returned */
1458
1770
interface = strdup(direntries[0]->d_name);
1459
1771
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1461
1773
}
1462
1774
if(interface == NULL){
1463
1775
perror_plus("malloc");
1468
1780
free(direntries);
1469
1781
} else {
1470
1782
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1472
1784
exitcode = EXIT_FAILURE;
1473
1785
goto end;
1474
1786
}
1480
1792
srand((unsigned int) time(NULL));
1481
1793
mc.simple_poll = avahi_simple_poll_new();
1482
1794
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1795
fprintf_plus(stderr,
1796
"Avahi: Failed to create simple poll object.\n");
1484
1797
exitcode = EX_UNAVAILABLE;
1485
1798
goto end;
1486
1799
}
1552
1865
if(strcmp(interface, "none") != 0){
1553
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
1867
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1556
1869
exitcode = EX_UNAVAILABLE;
1557
1870
goto end;
1558
1871
}
1645
1958
goto end;
1646
1959
}
1647
1960
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1649
1963
for(int i=0; i < delay * 4; i++){
1650
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
1965
if(ret == -1){
1677
1991
#endif /* __linux__ */
1678
1992
/* Lower privileges */
1679
1993
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
}
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1692
1998
}
1693
1999
}
1694
2000
1698
2004
1699
2005
ret = init_gnutls_global(pubkey, seckey);
1700
2006
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2008
exitcode = EX_UNAVAILABLE;
1703
2009
goto end;
1704
2010
} else {
1720
2026
}
1721
2027
1722
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2029
fprintf_plus(stderr, "init_gpgme failed\n");
1724
2030
exitcode = EX_UNAVAILABLE;
1725
2031
goto end;
1726
2032
} else {
1736
2042
/* (Mainly meant for debugging) */
1737
2043
char *address = strrchr(connect_to, ':');
1738
2044
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
2045
fprintf_plus(stderr, "No colon in address\n");
1740
2046
exitcode = EX_USAGE;
1741
2047
goto end;
1742
2048
}
1750
2056
tmpmax = strtoimax(address+1, &tmp, 10);
1751
2057
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
2058
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2059
fprintf_plus(stderr, "Bad port number\n");
1754
2060
exitcode = EX_USAGE;
1755
2061
goto end;
1756
2062
}
1761
2067
1762
2068
port = (uint16_t)tmpmax;
1763
2069
*address = '\0';
1764
address = connect_to;
1765
2070
/* Colon in address indicates IPv6 */
1766
2071
int af;
1767
if(strchr(address, ':') != NULL){
2072
if(strchr(connect_to, ':') != NULL){
1768
2073
af = AF_INET6;
2074
/* Accept [] around IPv6 address - see RFC 5952 */
2075
if(connect_to[0] == '[' and address[-1] == ']')
2076
{
2077
connect_to++;
2078
address[-1] = '\0';
2079
}
1769
2080
} else {
1770
2081
af = AF_INET;
1771
2082
}
2083
address = connect_to;
1772
2084
1773
2085
if(quit_now){
1774
2086
goto end;
1775
2087
}
1776
2088
1777
2089
while(not quit_now){
1778
2090
ret = start_mandos_communication(address, port, if_index, af);
1779
2091
if(quit_now or ret == 0){
1780
2092
break;
1781
2093
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
2094
if(debug){
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
(int)retry_interval);
2097
}
2098
sleep((int)retry_interval);
2099
}
2100
1785
2101
if (not quit_now){
1786
2102
exitcode = EXIT_SUCCESS;
1787
2103
}
1788
2104
1789
2105
goto end;
1790
2106
}
1791
2107
1813
2129
1814
2130
/* Check if creating the Avahi server object succeeded */
1815
2131
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
1818
2134
exitcode = EX_UNAVAILABLE;
1819
2135
goto end;
1820
2136
}
1828
2144
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
2145
NULL, 0, browse_callback, NULL);
1830
2146
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
avahi_strerror(avahi_server_errno(mc.server)));
1833
2149
exitcode = EX_UNAVAILABLE;
1834
2150
goto end;
1835
2151
}
1841
2157
/* Run the main loop */
1842
2158
1843
2159
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
2161
}
1846
2162
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
1848
2165
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
(ret == 0) ? "successfully" : "with error");
1851
2168
}
1852
2169
1853
2170
end:
1854
2171
1855
2172
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1857
2174
}
1858
2175
1859
2176
/* Cleanup things */
1876
2193
gpgme_release(mc.ctx);
1877
2194
}
1878
2195
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2196
/* Cleans up the circular linked list of Mandos servers the client
2197
has seen */
1880
2198
if(mc.current_server != NULL){
1881
2199
mc.current_server->prev->next = NULL;
1882
2200
while(mc.current_server != NULL){
1886
2204
}
1887
2205
}
1888
2206
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
2207
/* Re-raise priviliges */
2208
{
1892
2209
errno = 0;
1893
2210
ret = seteuid(0);
1894
2211
if(ret == -1){
1895
2212
perror_plus("seteuid");
1896
2213
}
1897
if(geteuid() == 0){
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2218
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
1898
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
2222
if(ret == -1){
1900
2223
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
2224
} else if(network.ifr_flags & IFF_UP){
1902
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
2227
if(ret == -1){
1909
2232
if(ret == -1){
1910
2233
perror_plus("close");
1911
2234
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
2235
}
1919
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
1920
2243
1921
2244
/* Removes the GPGME temp directory and all files inside */
1922
2245
if(tempdir_created){
1923
2246
struct dirent **direntries = NULL;
1924
2247
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
1928
2252
direntry = direntries[i];
1929
2253
char *fullname = NULL;
1930
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
1935
2259
}
1936
2260
ret = remove(fullname);
1937
2261
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
1940
2264
}
1941
2265
free(fullname);
1942
2266
}
1943
2267
}
1944
2268
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
2269
/* need to clean even if 0 because man page doesn't specify */
1946
2270
free(direntries);
1947
if (ret == -1){
2271
if (numentries == -1){
1948
2272
perror_plus("scandir");
1949
2273
}
1950
2274
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0