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 594.1.3
- compare with another revision
- download diff
- download tarball
- view history from revision 594.1.3
- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
90
91
91
92
#ifdef __linux__
92
93
#include <sys/klog.h> /* klogctl() */
110
111
init_gnutls_session(),
111
112
GNUTLS_* */
112
113
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
115
116
116
117
/* GPGME */
117
118
#include <gpgme.h> /* All GPGME types, constants and
134
135
static const char sys_class_net[] = "/sys/class/net";
135
136
char *connect_to = NULL;
136
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
137
140
138
141
/* Doubly linked list that need to be circularly linked when used */
139
142
typedef struct server{
169
172
170
173
/* Function to use when printing errors */
171
174
void perror_plus(const char *print_text){
175
int e = errno;
172
176
fprintf(stderr, "Mandos plugin %s: ",
173
177
program_invocation_short_name);
178
errno = e;
174
179
perror(print_text);
175
180
}
176
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
177
192
/*
178
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
194
* bytes. "buffer_capacity" is how much is currently allocated,
180
195
* "buffer_length" is how much is already used.
181
196
*/
182
197
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
198
size_t buffer_capacity){
184
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
201
if(buffer == NULL){
192
207
}
193
208
194
209
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
198
212
int ret;
199
213
server *new_server = malloc(sizeof(server));
200
214
if(new_server == NULL){
201
215
perror_plus("malloc");
202
return -1;
216
return false;
203
217
}
204
218
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
219
.port = port,
220
.if_index = if_index,
221
.af = af };
208
222
if(new_server->ip == NULL){
209
223
perror_plus("strdup");
210
return -1;
224
return false;
211
225
}
212
226
/* Special case of first server */
213
227
if (mc.current_server == NULL){
224
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
239
if(ret == -1){
226
240
perror_plus("clock_gettime");
227
return -1;
241
return false;
228
242
}
229
return 0;
243
return true;
230
244
}
231
245
232
246
/*
233
247
* Initialize GPGME.
234
248
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
237
251
gpgme_error_t rc;
238
252
gpgme_engine_info_t engine_info;
239
253
254
268
255
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
270
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
260
273
return false;
261
274
}
262
275
263
276
rc = gpgme_op_import(mc.ctx, pgp_data);
264
277
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
268
280
return false;
269
281
}
270
282
277
289
}
278
290
279
291
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
282
293
}
283
294
284
295
/* Init GPGME */
285
296
gpgme_check_version(NULL);
286
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
298
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
291
301
return false;
292
302
}
293
303
294
304
/* Set GPGME home directory for the OpenPGP engine only */
295
305
rc = gpgme_get_engine_info(&engine_info);
296
306
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
300
309
return false;
301
310
}
302
311
while(engine_info != NULL){
308
317
engine_info = engine_info->next;
309
318
}
310
319
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
313
322
return false;
314
323
}
315
324
316
325
/* Create new GPGME "context" */
317
326
rc = gpgme_new(&(mc.ctx));
318
327
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
322
331
return false;
323
332
}
324
333
343
352
ssize_t plaintext_length = 0;
344
353
345
354
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
356
}
349
357
350
358
/* Create new GPGME data buffer from memory cryptotext */
351
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
360
0);
353
361
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
357
364
return -1;
358
365
}
359
366
360
367
/* Create new empty GPGME data buffer for the plaintext */
361
368
rc = gpgme_data_new(&dh_plain);
362
369
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
366
373
gpgme_data_release(dh_crypto);
367
374
return -1;
368
375
}
371
378
data buffer */
372
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
380
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
377
383
plaintext_length = -1;
378
384
if(debug){
379
385
gpgme_decrypt_result_t result;
380
386
result = gpgme_op_decrypt_result(mc.ctx);
381
387
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
389
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
391
394
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
396
}
395
397
gpgme_recipient_t recipient;
396
398
recipient = result->recipients;
397
399
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
407
recipient = recipient->next;
408
408
}
409
409
}
412
412
}
413
413
414
414
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
416
}
418
417
419
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
425
*plaintext = NULL;
427
426
while(true){
428
427
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
431
430
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
435
434
}
436
435
437
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
449
}
451
450
452
451
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
455
453
for(ssize_t i = 0; i < plaintext_length; i++){
456
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
455
}
479
477
/* GnuTLS log function callback */
480
478
static void debuggnutls(__attribute__((unused)) int level,
481
479
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
483
481
}
484
482
485
483
static int init_gnutls_global(const char *pubkeyfilename,
487
485
int ret;
488
486
489
487
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
492
489
}
493
490
494
491
ret = gnutls_global_init();
495
492
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
498
495
return -1;
499
496
}
500
497
509
506
/* OpenPGP credentials */
510
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
511
508
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
514
511
gnutls_global_deinit();
515
512
return -1;
516
513
}
517
514
518
515
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
seckeyfilename);
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
523
520
}
524
521
525
522
ret = gnutls_certificate_set_openpgp_key_file
526
523
(mc.cred, pubkeyfilename, seckeyfilename,
527
524
GNUTLS_OPENPGP_FMT_BASE64);
528
525
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
535
531
goto globalfail;
536
532
}
537
533
538
534
/* GnuTLS server initialization */
539
535
ret = gnutls_dh_params_init(&mc.dh_params);
540
536
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
544
540
goto globalfail;
545
541
}
546
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
543
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
551
546
goto globalfail;
552
547
}
553
548
573
568
}
574
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
570
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
579
574
}
580
575
581
576
{
588
583
}
589
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
585
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
595
589
gnutls_deinit(*session);
596
590
return -1;
597
591
}
606
600
}
607
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
602
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
612
605
gnutls_deinit(*session);
613
606
return -1;
614
607
}
659
652
pf = PF_INET;
660
653
break;
661
654
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
656
errno = EINVAL;
665
657
return -1;
666
658
}
671
663
}
672
664
673
665
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
677
668
}
678
669
679
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
696
}
706
697
if(ret == 0){
707
698
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
700
errno = e;
711
701
goto mandos_end;
712
702
}
717
707
718
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
710
-Wunreachable-code*/
721
711
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
725
714
errno = EINVAL;
726
715
goto mandos_end;
727
716
}
745
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
735
perror_plus("if_indextoname");
747
736
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
751
739
}
752
740
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
755
743
}
756
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
767
755
perror_plus("inet_ntop");
768
756
} else {
769
757
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
772
759
}
773
760
}
774
761
}
802
789
while(true){
803
790
size_t out_size = strlen(out);
804
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
792
out_size - written));
806
793
if(ret == -1){
807
794
int e = errno;
808
795
perror_plus("write");
828
815
}
829
816
830
817
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
819
}
834
820
835
821
if(quit_now){
837
823
goto mandos_end;
838
824
}
839
825
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
842
831
843
832
if(quit_now){
844
833
errno = EINTR;
855
844
856
845
if(ret != GNUTLS_E_SUCCESS){
857
846
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
848
gnutls_perror(ret);
861
849
}
862
850
errno = EPROTO;
866
854
/* Read OpenPGP packet that contains the wanted password */
867
855
868
856
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
871
859
}
872
860
873
861
while(true){
878
866
}
879
867
880
868
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
869
buffer_capacity);
882
870
if(buffer_capacity == 0){
883
871
int e = errno;
884
872
perror_plus("incbuffer");
911
899
}
912
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
901
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
916
904
gnutls_perror(ret);
917
905
errno = EPROTO;
918
906
goto mandos_end;
919
907
}
920
908
break;
921
909
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
925
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
913
errno = EIO;
927
914
goto mandos_end;
932
919
}
933
920
934
921
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
922
fprintf_plus(stderr, "Closing TLS session\n");
937
923
}
938
924
939
925
if(quit_now){
951
937
952
938
if(buffer_length > 0){
953
939
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
956
941
&decrypted_buffer);
957
942
if(decrypted_buffer_size >= 0){
958
943
969
954
if(ret == 0 and ferror(stdout)){
970
955
int e = errno;
971
956
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
975
959
}
976
960
errno = e;
977
961
goto mandos_end;
1034
1018
switch(event){
1035
1019
default:
1036
1020
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
1041
1025
break;
1042
1026
1043
1027
case AVAHI_RESOLVER_FOUND:
1045
1029
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1030
avahi_address_snprint(ip, sizeof(ip), address);
1047
1031
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
1052
1035
}
1053
1036
int ret = start_mandos_communication(ip, port, interface,
1054
1037
avahi_proto_to_af(proto));
1055
1038
if(ret == 0){
1056
1039
avahi_simple_poll_quit(mc.simple_poll);
1057
1040
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1060
1046
}
1061
1047
}
1062
1048
}
1086
1072
default:
1087
1073
case AVAHI_BROWSER_FAILURE:
1088
1074
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1092
1077
avahi_simple_poll_quit(mc.simple_poll);
1093
1078
return;
1094
1079
1101
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
1087
name, type, domain, protocol, 0,
1103
1088
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
1107
1092
break;
1108
1093
1109
1094
case AVAHI_BROWSER_REMOVE:
1112
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1099
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
1117
1102
}
1118
1103
break;
1119
1104
}
1158
1143
/* Reject the loopback device */
1159
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1145
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1163
1148
}
1164
1149
return false;
1165
1150
}
1166
1151
/* Accept point-to-point devices only if connect_to is specified */
1167
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1153
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1171
1156
}
1172
1157
return true;
1173
1158
}
1174
1159
/* Otherwise, reject non-broadcast-capable devices */
1175
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1161
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1179
1164
}
1180
1165
return false;
1181
1166
}
1182
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1168
if(ifr->ifr_flags & IFF_NOARP){
1184
1169
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1187
1172
}
1188
1173
return false;
1189
1174
}
1190
1175
1191
1176
/* Accept this device */
1192
1177
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1179
}
1196
1180
return true;
1197
1181
}
1209
1193
struct ifreq ifr;
1210
1194
if(not get_flags(if_entry->d_name, &ifr)){
1211
1195
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1215
1198
}
1216
1199
return 0;
1217
1200
}
1235
1218
struct ifreq ifr;
1236
1219
if(not get_flags(if_entry->d_name, &ifr)){
1237
1220
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1241
1223
}
1242
1224
return 0;
1243
1225
}
1245
1227
/* Reject down interfaces */
1246
1228
if(not (ifr.ifr_flags & IFF_UP)){
1247
1229
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1251
1232
}
1252
1233
return 0;
1253
1234
}
1255
1236
/* Reject non-running interfaces */
1256
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
1238
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1261
1241
}
1262
1242
return 0;
1263
1243
}
1282
1262
/* Is this directory entry a runnable program? */
1283
1263
int runnable_hook(const struct dirent *direntry){
1284
1264
int ret;
1265
size_t sret;
1285
1266
struct stat st;
1286
1267
1287
1268
if((direntry->d_name)[0] == '\0'){
1289
1270
return 0;
1290
1271
}
1291
1272
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1307
1285
1308
1286
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1311
1288
if(ret < 0){
1312
1289
perror_plus("asprintf");
1313
1290
return 0;
1316
1293
ret = stat(fullname, &st);
1317
1294
if(ret == -1){
1318
1295
if(debug){
1319
perror_plus("Could not stat plugin");
1296
perror_plus("Could not stat hook");
1320
1297
}
1321
1298
return 0;
1322
1299
}
1323
1300
if(not (S_ISREG(st.st_mode))){
1324
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1325
1306
return 0;
1326
1307
}
1327
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1329
1314
return 0;
1330
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1331
1320
return 1;
1332
1321
}
1333
1322
1340
1329
while(true){
1341
1330
if(mc.current_server == NULL){
1342
1331
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1345
1334
}
1346
1335
ret = avahi_simple_poll_iterate(s, -1);
1347
1336
} else {
1348
1337
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1352
1340
}
1353
1341
/* the current time */
1354
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1370
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1359
1372
1360
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1375
1363
}
1376
1364
1377
1365
if(block_time <= 0){
1404
1392
}
1405
1393
}
1406
1394
1395
/* Set effective uid to 0, return errno */
1396
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1402
}
1403
errno = old_errno;
1404
return ret_errno;
1405
}
1406
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1411
if(ret_errno != 0){
1412
errno = old_errno;
1413
return ret_errno;
1414
}
1415
if(setuid(0) == -1){
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1418
}
1419
errno = old_errno;
1420
return ret_errno;
1421
}
1422
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1428
ret_errno = errno;
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1436
const float delay){
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1442
if(numhooks == -1){
1443
perror_plus("scandir");
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1451
perror_plus("asprintf");
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
free(delaystring);
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1522
} else {
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
1559
}
1560
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1563
int sd = -1;
1564
int old_errno = errno;
1565
int ret_errno = 0;
1566
int ret;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1569
if(if_index == 0){
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
errno = old_errno;
1572
return ENXIO;
1573
}
1574
1575
if(quit_now){
1576
errno = old_errno;
1577
return EINTR;
1578
}
1579
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
ret_errno = errno;
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1645
errno = old_errno;
1646
return ret_errno;
1647
}
1648
}
1649
/* Sleep checking until interface is running.
1650
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1656
break;
1657
}
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1659
ret = nanosleep(&sleeptime, NULL);
1660
if(ret == -1 and errno != EINTR){
1661
perror_plus("nanosleep");
1662
}
1663
}
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1407
1684
int main(int argc, char *argv[]){
1408
1685
AvahiSServiceBrowser *sb = NULL;
1409
1686
int error;
1415
1692
struct ifreq network;
1416
1693
int sd = -1;
1417
1694
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1421
1696
bool tempdir_created = false;
1422
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1489
1764
.group = 2 },
1490
1765
{ .name = "retry", .key = 132,
1491
1766
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1767
.doc = "Retry interval used when denied by the Mandos server",
1493
1768
.group = 2 },
1494
1769
{ .name = "network-hook-dir", .key = 133,
1495
1770
.arg = "DIR",
1567
1842
argp_state_help(state, state->out_stream,
1568
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
1844
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
1846
exit(argp_err_exit_status);
1573
1847
break;
1574
1848
default:
1601
1875
{
1602
1876
/* Work around Debian bug #633582:
1603
1877
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1878
1606
1879
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1880
if(raise_privileges() == 0){
1881
struct stat st;
1882
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1884
int seckey_fd = open(seckey, O_RDONLY);
1885
if(seckey_fd == -1){
1886
perror_plus("open");
1887
} else {
1888
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1889
if(ret == -1){
1890
perror_plus("fstat");
1891
} else {
1892
if(S_ISREG(st.st_mode)
1893
and st.st_uid == 0 and st.st_gid == 0){
1894
ret = fchown(seckey_fd, uid, gid);
1895
if(ret == -1){
1896
perror_plus("fchown");
1897
}
1898
}
1899
}
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
1901
}
1902
}
1903
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
int pubkey_fd = open(pubkey, O_RDONLY);
1906
if(pubkey_fd == -1){
1907
perror_plus("open");
1908
} else {
1909
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1910
if(ret == -1){
1911
perror_plus("fstat");
1912
} else {
1913
if(S_ISREG(st.st_mode)
1914
and st.st_uid == 0 and st.st_gid == 0){
1915
ret = fchown(pubkey_fd, uid, gid);
1916
if(ret == -1){
1917
perror_plus("fchown");
1918
}
1919
}
1920
}
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1922
}
1923
}
1924
1925
/* Lower privileges */
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
1930
}
1658
1931
}
1659
1932
}
1660
1933
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1753
1937
}
1754
1938
1755
1939
if(not debug){
1771
1955
/* Pick the first interface returned */
1772
1956
interface = strdup(direntries[0]->d_name);
1773
1957
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1776
1959
}
1777
1960
if(interface == NULL){
1778
1961
perror_plus("malloc");
1783
1966
free(direntries);
1784
1967
} else {
1785
1968
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1788
1970
exitcode = EXIT_FAILURE;
1789
1971
goto end;
1790
1972
}
1796
1978
srand((unsigned int) time(NULL));
1797
1979
mc.simple_poll = avahi_simple_poll_new();
1798
1980
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1801
1983
exitcode = EX_UNAVAILABLE;
1802
1984
goto end;
1803
1985
}
1866
2048
}
1867
2049
1868
2050
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
1954
}
1955
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
break;
1974
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2011
2056
}
2012
2057
}
2013
2058
2017
2062
2018
2063
ret = init_gnutls_global(pubkey, seckey);
2019
2064
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2066
exitcode = EX_UNAVAILABLE;
2023
2067
goto end;
2024
2068
} else {
2040
2084
}
2041
2085
2042
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2088
exitcode = EX_UNAVAILABLE;
2046
2089
goto end;
2047
2090
} else {
2056
2099
/* Connect directly, do not use Zeroconf */
2057
2100
/* (Mainly meant for debugging) */
2058
2101
char *address = strrchr(connect_to, ':');
2102
2059
2103
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2104
fprintf_plus(stderr, "No colon in address\n");
2062
2105
exitcode = EX_USAGE;
2063
2106
goto end;
2064
2107
}
2072
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
2117
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2118
fprintf_plus(stderr, "Bad port number\n");
2077
2119
exitcode = EX_USAGE;
2078
2120
goto end;
2079
2121
}
2109
2151
break;
2110
2152
}
2111
2153
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
(int)retry_interval);
2114
2156
}
2115
2157
sleep((int)retry_interval);
2116
2158
}
2146
2188
2147
2189
/* Check if creating the Avahi server object succeeded */
2148
2190
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
2152
2193
exitcode = EX_UNAVAILABLE;
2153
2194
goto end;
2154
2195
}
2162
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
2204
NULL, 0, browse_callback, NULL);
2164
2205
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
avahi_strerror(avahi_server_errno(mc.server)));
2168
2208
exitcode = EX_UNAVAILABLE;
2169
2209
goto end;
2170
2210
}
2176
2216
/* Run the main loop */
2177
2217
2178
2218
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2220
}
2182
2221
2183
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
2223
(int)(retry_interval * 1000));
2185
2224
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
(ret == 0) ? "successfully" : "with error");
2189
2227
}
2190
2228
2191
2229
end:
2192
2230
2193
2231
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2196
2233
}
2197
2234
2198
2235
/* Cleanup things */
2214
2251
if(gpgme_initialized){
2215
2252
gpgme_release(mc.ctx);
2216
2253
}
2217
2254
2218
2255
/* Cleans up the circular linked list of Mandos servers the client
2219
2256
has seen */
2220
2257
if(mc.current_server != NULL){
2226
2263
}
2227
2264
}
2228
2265
2229
/* XXX run network hooks "stop" here */
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2230
2268
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2269
/* Re-raise priviliges */
2270
{
2271
raise_privileges();
2272
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2240
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
2276
if(ret == -1){
2242
2277
perror_plus("ioctl SIOCGIFFLAGS");
2251
2286
if(ret == -1){
2252
2287
perror_plus("close");
2253
2288
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
2289
}
2261
2290
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2262
2297
2263
2298
/* Removes the GPGME temp directory and all files inside */
2264
2299
if(tempdir_created){
2278
2313
}
2279
2314
ret = remove(fullname);
2280
2315
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2283
2318
}
2284
2319
free(fullname);
2285
2320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0