To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 526
- compare with another revision
- download diff
- download tarball
- view history from revision 526
- Committer: Teddy Hogeborn
- Date: 2011-12-21 16:33:08 UTC
- mfrom: (518.2.11 persistent-state-gpgme)
- Revision ID: teddy@recompile.se-20111221163308-ym3wtqf1kindtsxp
Merge threading/seg fault fix.
- 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
int 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){
194
211
return -1;
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 -1;
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;
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));
1039
1061
default:
1040
1062
case AVAHI_BROWSER_FAILURE:
1041
1063
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1044
1066
avahi_simple_poll_quit(mc.simple_poll);
1045
1067
return;
1046
1068
1053
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1076
name, type, domain, protocol, 0,
1055
1077
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1058
1081
break;
1059
1082
1060
1083
case AVAHI_BROWSER_REMOVE:
1063
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1088
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1067
1091
}
1068
1092
break;
1069
1093
}
1070
1094
}
1071
1095
1072
/* Signal handler that stops main loop after sigterm has been called */
1096
/* Signal handler that stops main loop after SIGTERM */
1073
1097
static void handle_sigterm(int sig){
1074
1098
if(quit_now){
1075
1099
return;
1084
1108
errno = old_errno;
1085
1109
}
1086
1110
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){
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1143
1122
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1146
1124
}
1147
free(flagstring);
1148
return 0;
1125
return false;
1149
1126
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1152
1132
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1134
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1157
1137
}
1158
return 0;
1138
return false;
1159
1139
}
1160
1140
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1142
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1165
1145
}
1166
return 1;
1146
return true;
1167
1147
}
1168
1148
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1150
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1173
1153
}
1174
return 0;
1154
return false;
1175
1155
}
1176
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1157
if(ifr->ifr_flags & IFF_NOARP){
1178
1158
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1181
1161
}
1182
return 0;
1162
return false;
1183
1163
}
1164
1184
1165
/* Accept this device */
1185
1166
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1188
1236
}
1189
1237
return 1;
1190
1238
}
1200
1248
return 1;
1201
1249
}
1202
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1203
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1313
int ret;
1205
1314
struct timespec now;
1206
1315
struct timespec waited_time;
1207
1316
intmax_t block_time;
1208
1317
1209
1318
while(true){
1210
1319
if(mc.current_server == NULL){
1211
1320
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1213
1323
}
1214
1324
ret = avahi_simple_poll_iterate(s, -1);
1215
1325
} else {
1216
1326
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1218
1329
}
1219
1330
/* the current time */
1220
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
1335
}
1225
1336
/* Calculating in ms how long time between now and server
1226
1337
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
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1232
1349
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1234
1352
}
1235
1353
1236
1354
if(block_time <= 0){
1237
1355
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1241
1359
if(ret == 0){
1242
1360
avahi_simple_poll_quit(mc.simple_poll);
1243
1361
return 0;
1244
1362
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1246
1365
if(ret == -1){
1247
1366
perror_plus("clock_gettime");
1248
1367
return -1;
1249
1368
}
1250
1369
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1252
1372
}
1253
1373
1254
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
1375
}
1256
1376
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1377
if (ret > 0 or errno != EINTR){
1258
1378
return (ret != 1) ? ret : 0;
1259
1379
}
1260
1380
}
1261
1381
}
1262
1382
}
1263
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1509
}
1510
1264
1511
int main(int argc, char *argv[]){
1265
1512
AvahiSServiceBrowser *sb = NULL;
1266
1513
int error;
1283
1530
bool gnutls_initialized = false;
1284
1531
bool gpgme_initialized = false;
1285
1532
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1287
1535
1288
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
1537
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1347
1595
.arg = "SECONDS",
1348
1596
.doc = "Retry interval used when denied by the mandos server",
1349
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1350
1602
/*
1351
1603
* These reproduce what we would get without ARGP_NO_HELP
1352
1604
*/
1400
1652
errno = 0;
1401
1653
retry_interval = strtod(arg, &tmp);
1402
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1404
1657
argp_error(state, "Bad retry interval");
1405
1658
}
1406
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
break;
1407
1663
/*
1408
1664
* These reproduce what we would get without ARGP_NO_HELP
1409
1665
*/
1415
1671
argp_state_help(state, state->out_stream,
1416
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
1673
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
1677
exit(argp_err_exit_status);
1420
1678
break;
1421
1679
default:
1444
1702
goto end;
1445
1703
}
1446
1704
}
1705
1706
{
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1709
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1772
}
1447
1773
1448
1774
if(not debug){
1449
1775
avahi_set_log_function(empty_log);
1450
1776
}
1451
1777
1452
1778
if(interface[0] == '\0'){
1453
1779
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1455
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1456
1789
if(ret >= 1){
1457
/* Pick the first good interface */
1790
/* Pick the first interface returned */
1458
1791
interface = strdup(direntries[0]->d_name);
1459
1792
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1461
1794
}
1462
1795
if(interface == NULL){
1463
1796
perror_plus("malloc");
1468
1801
free(direntries);
1469
1802
} else {
1470
1803
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1472
1805
exitcode = EXIT_FAILURE;
1473
1806
goto end;
1474
1807
}
1480
1813
srand((unsigned int) time(NULL));
1481
1814
mc.simple_poll = avahi_simple_poll_new();
1482
1815
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1484
1818
exitcode = EX_UNAVAILABLE;
1485
1819
goto end;
1486
1820
}
1552
1886
if(strcmp(interface, "none") != 0){
1553
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
1888
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1556
1890
exitcode = EX_UNAVAILABLE;
1557
1891
goto end;
1558
1892
}
1645
1979
goto end;
1646
1980
}
1647
1981
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1649
1984
for(int i=0; i < delay * 4; i++){
1650
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
1986
if(ret == -1){
1677
2012
#endif /* __linux__ */
1678
2013
/* Lower privileges */
1679
2014
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
}
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
1692
2019
}
1693
2020
}
1694
2021
1698
2025
1699
2026
ret = init_gnutls_global(pubkey, seckey);
1700
2027
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2029
exitcode = EX_UNAVAILABLE;
1703
2030
goto end;
1704
2031
} else {
1720
2047
}
1721
2048
1722
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2050
fprintf_plus(stderr, "init_gpgme failed\n");
1724
2051
exitcode = EX_UNAVAILABLE;
1725
2052
goto end;
1726
2053
} else {
1736
2063
/* (Mainly meant for debugging) */
1737
2064
char *address = strrchr(connect_to, ':');
1738
2065
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
2066
fprintf_plus(stderr, "No colon in address\n");
1740
2067
exitcode = EX_USAGE;
1741
2068
goto end;
1742
2069
}
1750
2077
tmpmax = strtoimax(address+1, &tmp, 10);
1751
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
2079
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2080
fprintf_plus(stderr, "Bad port number\n");
1754
2081
exitcode = EX_USAGE;
1755
2082
goto end;
1756
2083
}
1761
2088
1762
2089
port = (uint16_t)tmpmax;
1763
2090
*address = '\0';
1764
address = connect_to;
1765
2091
/* Colon in address indicates IPv6 */
1766
2092
int af;
1767
if(strchr(address, ':') != NULL){
2093
if(strchr(connect_to, ':') != NULL){
1768
2094
af = AF_INET6;
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2097
{
2098
connect_to++;
2099
address[-1] = '\0';
2100
}
1769
2101
} else {
1770
2102
af = AF_INET;
1771
2103
}
2104
address = connect_to;
1772
2105
1773
2106
if(quit_now){
1774
2107
goto end;
1775
2108
}
1776
2109
1777
2110
while(not quit_now){
1778
2111
ret = start_mandos_communication(address, port, if_index, af);
1779
2112
if(quit_now or ret == 0){
1780
2113
break;
1781
2114
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
2115
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2118
}
2119
sleep((int)retry_interval);
2120
}
2121
1785
2122
if (not quit_now){
1786
2123
exitcode = EXIT_SUCCESS;
1787
2124
}
1788
2125
1789
2126
goto end;
1790
2127
}
1791
2128
1813
2150
1814
2151
/* Check if creating the Avahi server object succeeded */
1815
2152
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
1818
2155
exitcode = EX_UNAVAILABLE;
1819
2156
goto end;
1820
2157
}
1828
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
2166
NULL, 0, browse_callback, NULL);
1830
2167
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
1833
2170
exitcode = EX_UNAVAILABLE;
1834
2171
goto end;
1835
2172
}
1841
2178
/* Run the main loop */
1842
2179
1843
2180
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
2182
}
1846
2183
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
1848
2186
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
1851
2189
}
1852
2190
1853
2191
end:
1854
2192
1855
2193
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1857
2195
}
1858
2196
1859
2197
/* Cleanup things */
1875
2213
if(gpgme_initialized){
1876
2214
gpgme_release(mc.ctx);
1877
2215
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2216
2217
/* Cleans up the circular linked list of Mandos servers the client
2218
has seen */
1880
2219
if(mc.current_server != NULL){
1881
2220
mc.current_server->prev->next = NULL;
1882
2221
while(mc.current_server != NULL){
1886
2225
}
1887
2226
}
1888
2227
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
1892
2233
errno = 0;
1893
2234
ret = seteuid(0);
1894
2235
if(ret == -1){
1895
2236
perror_plus("seteuid");
1896
2237
}
1897
if(geteuid() == 0){
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
1898
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
2242
if(ret == -1){
1900
2243
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
2244
} else if(network.ifr_flags & IFF_UP){
1902
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
2247
if(ret == -1){
1909
2252
if(ret == -1){
1910
2253
perror_plus("close");
1911
2254
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
2255
}
1919
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
1920
2263
1921
2264
/* Removes the GPGME temp directory and all files inside */
1922
2265
if(tempdir_created){
1923
2266
struct dirent **direntries = NULL;
1924
2267
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
1928
2272
direntry = direntries[i];
1929
2273
char *fullname = NULL;
1930
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
1935
2279
}
1936
2280
ret = remove(fullname);
1937
2281
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
1940
2284
}
1941
2285
free(fullname);
1942
2286
}
1943
2287
}
1944
2288
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
2289
/* need to clean even if 0 because man page doesn't specify */
1946
2290
free(direntries);
1947
if (ret == -1){
2291
if (numentries == -1){
1948
2292
perror_plus("scandir");
1949
2293
}
1950
2294
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0