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- 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() */
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() */
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
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
88
91
89
92
#ifdef __linux__
90
93
#include <sys/klog.h> /* klogctl() */
108
111
init_gnutls_session(),
109
112
GNUTLS_* */
110
113
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
113
116
114
117
/* GPGME */
115
118
#include <gpgme.h> /* All GPGME types, constants and
123
126
#define PATHDIR "/conf/conf.d/mandos"
124
127
#define SECKEY "seckey.txt"
125
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
130
127
131
bool debug = false;
128
132
static const char mandos_protocol_version[] = "1";
130
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
135
static const char sys_class_net[] = "/sys/class/net";
132
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
133
140
134
141
/* Doubly linked list that need to be circularly linked when used */
135
142
typedef struct server{
165
172
166
173
/* Function to use when printing errors */
167
174
void perror_plus(const char *print_text){
175
int e = errno;
168
176
fprintf(stderr, "Mandos plugin %s: ",
169
177
program_invocation_short_name);
178
errno = e;
170
179
perror(print_text);
171
180
}
172
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
173
192
/*
174
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
194
* bytes. "buffer_capacity" is how much is currently allocated,
176
195
* "buffer_length" is how much is already used.
177
196
*/
178
197
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
198
size_t buffer_capacity){
180
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
201
if(buffer == NULL){
188
207
}
189
208
190
209
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
194
212
int ret;
195
213
server *new_server = malloc(sizeof(server));
196
214
if(new_server == NULL){
197
215
perror_plus("malloc");
198
return -1;
216
return false;
199
217
}
200
218
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
219
.port = port,
220
.if_index = if_index,
221
.af = af };
204
222
if(new_server->ip == NULL){
205
223
perror_plus("strdup");
206
return -1;
224
return false;
207
225
}
208
226
/* Special case of first server */
209
227
if (mc.current_server == NULL){
220
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
239
if(ret == -1){
222
240
perror_plus("clock_gettime");
223
return -1;
241
return false;
224
242
}
225
return 0;
243
return true;
226
244
}
227
245
228
246
/*
229
247
* Initialize GPGME.
230
248
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
233
251
gpgme_error_t rc;
234
252
gpgme_engine_info_t engine_info;
235
253
250
268
251
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
270
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
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));
255
273
return false;
256
274
}
257
275
258
276
rc = gpgme_op_import(mc.ctx, pgp_data);
259
277
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
262
280
return false;
263
281
}
264
282
271
289
}
272
290
273
291
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
275
293
}
276
294
277
295
/* Init GPGME */
278
296
gpgme_check_version(NULL);
279
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
298
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
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));
283
301
return false;
284
302
}
285
303
286
304
/* Set GPGME home directory for the OpenPGP engine only */
287
305
rc = gpgme_get_engine_info(&engine_info);
288
306
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
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));
291
309
return false;
292
310
}
293
311
while(engine_info != NULL){
299
317
engine_info = engine_info->next;
300
318
}
301
319
if(engine_info == NULL){
302
fprintf(stderr, "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);
303
322
return false;
304
323
}
305
324
306
325
/* Create new GPGME "context" */
307
326
rc = gpgme_new(&(mc.ctx));
308
327
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), 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));
311
331
return false;
312
332
}
313
333
332
352
ssize_t plaintext_length = 0;
333
353
334
354
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
356
}
337
357
338
358
/* Create new GPGME data buffer from memory cryptotext */
339
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
360
0);
341
361
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
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));
344
364
return -1;
345
365
}
346
366
347
367
/* Create new empty GPGME data buffer for the plaintext */
348
368
rc = gpgme_data_new(&dh_plain);
349
369
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
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));
352
373
gpgme_data_release(dh_crypto);
353
374
return -1;
354
375
}
357
378
data buffer */
358
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
380
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
362
383
plaintext_length = -1;
363
384
if(debug){
364
385
gpgme_decrypt_result_t result;
365
386
result = gpgme_op_decrypt_result(mc.ctx);
366
387
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
389
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
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);
373
394
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
396
}
376
397
gpgme_recipient_t recipient;
377
398
recipient = result->recipients;
378
399
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "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");
385
407
recipient = recipient->next;
386
408
}
387
409
}
390
412
}
391
413
392
414
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
416
}
395
417
396
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
425
*plaintext = NULL;
404
426
while(true){
405
427
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
408
430
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
412
434
}
413
435
414
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
449
}
428
450
429
451
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
431
453
for(ssize_t i = 0; i < plaintext_length; i++){
432
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
455
}
455
477
/* GnuTLS log function callback */
456
478
static void debuggnutls(__attribute__((unused)) int level,
457
479
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
459
481
}
460
482
461
483
static int init_gnutls_global(const char *pubkeyfilename,
463
485
int ret;
464
486
465
487
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
489
}
468
490
469
491
ret = gnutls_global_init();
470
492
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
473
495
return -1;
474
496
}
475
497
484
506
/* OpenPGP credentials */
485
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
508
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
489
511
gnutls_global_deinit();
490
512
return -1;
491
513
}
492
514
493
515
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
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);
497
520
}
498
521
499
522
ret = gnutls_certificate_set_openpgp_key_file
500
523
(mc.cred, pubkeyfilename, seckeyfilename,
501
524
GNUTLS_OPENPGP_FMT_BASE64);
502
525
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
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));
508
531
goto globalfail;
509
532
}
510
533
511
534
/* GnuTLS server initialization */
512
535
ret = gnutls_dh_params_init(&mc.dh_params);
513
536
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
516
540
goto globalfail;
517
541
}
518
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
543
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
522
546
goto globalfail;
523
547
}
524
548
544
568
}
545
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
570
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
549
574
}
550
575
551
576
{
558
583
}
559
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
585
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
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));
564
589
gnutls_deinit(*session);
565
590
return -1;
566
591
}
575
600
}
576
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
602
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
580
605
gnutls_deinit(*session);
581
606
return -1;
582
607
}
627
652
pf = PF_INET;
628
653
break;
629
654
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
656
errno = EINVAL;
632
657
return -1;
633
658
}
638
663
}
639
664
640
665
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
643
668
}
644
669
645
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
696
}
672
697
if(ret == 0){
673
698
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
700
errno = e;
676
701
goto mandos_end;
677
702
}
682
707
683
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
710
-Wunreachable-code*/
686
711
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
689
714
errno = EINVAL;
690
715
goto mandos_end;
691
716
}
709
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
735
perror_plus("if_indextoname");
711
736
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
714
739
}
715
740
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
718
743
}
719
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
755
perror_plus("inet_ntop");
731
756
} else {
732
757
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
759
}
735
760
}
736
761
}
764
789
while(true){
765
790
size_t out_size = strlen(out);
766
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
792
out_size - written));
768
793
if(ret == -1){
769
794
int e = errno;
770
795
perror_plus("write");
790
815
}
791
816
792
817
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
819
}
795
820
796
821
if(quit_now){
798
823
goto mandos_end;
799
824
}
800
825
801
/* Spurious warning from -Wint-to-pointer-cast */
802
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);
803
831
804
832
if(quit_now){
805
833
errno = EINTR;
816
844
817
845
if(ret != GNUTLS_E_SUCCESS){
818
846
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
848
gnutls_perror(ret);
821
849
}
822
850
errno = EPROTO;
826
854
/* Read OpenPGP packet that contains the wanted password */
827
855
828
856
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
831
859
}
832
860
833
861
while(true){
838
866
}
839
867
840
868
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
869
buffer_capacity);
842
870
if(buffer_capacity == 0){
843
871
int e = errno;
844
872
perror_plus("incbuffer");
871
899
}
872
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
901
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
875
904
gnutls_perror(ret);
876
905
errno = EPROTO;
877
906
goto mandos_end;
878
907
}
879
908
break;
880
909
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
883
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
913
errno = EIO;
885
914
goto mandos_end;
890
919
}
891
920
892
921
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
922
fprintf_plus(stderr, "Closing TLS session\n");
894
923
}
895
924
896
925
if(quit_now){
908
937
909
938
if(buffer_length > 0){
910
939
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
941
&decrypted_buffer);
914
942
if(decrypted_buffer_size >= 0){
915
943
926
954
if(ret == 0 and ferror(stdout)){
927
955
int e = errno;
928
956
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
931
959
}
932
960
errno = e;
933
961
goto mandos_end;
990
1018
switch(event){
991
1019
default:
992
1020
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
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)));
996
1025
break;
997
1026
998
1027
case AVAHI_RESOLVER_FOUND:
1000
1029
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1030
avahi_address_snprint(ip, sizeof(ip), address);
1002
1031
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
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);
1006
1035
}
1007
1036
int ret = start_mandos_communication(ip, port, interface,
1008
1037
avahi_proto_to_af(proto));
1009
1038
if(ret == 0){
1010
1039
avahi_simple_poll_quit(mc.simple_poll);
1011
1040
} else {
1012
ret = add_server(ip, port, interface,
1013
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
}
1014
1046
}
1015
1047
}
1016
1048
}
1040
1072
default:
1041
1073
case AVAHI_BROWSER_FAILURE:
1042
1074
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1045
1077
avahi_simple_poll_quit(mc.simple_poll);
1046
1078
return;
1047
1079
1054
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1087
name, type, domain, protocol, 0,
1056
1088
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
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)));
1059
1092
break;
1060
1093
1061
1094
case AVAHI_BROWSER_REMOVE:
1064
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1099
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
1068
1102
}
1069
1103
break;
1070
1104
}
1085
1119
errno = old_errno;
1086
1120
}
1087
1121
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
1123
int ret;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1124
1099
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1100
1126
if(s < 0){
1101
1127
perror_plus("socket");
1102
return 0;
1128
return false;
1103
1129
}
1104
struct ifreq ifr;
1105
strcpy(ifr.ifr_name, if_entry->d_name);
1106
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
1132
if(ret == -1){
1108
1133
if(debug){
1109
1134
perror_plus("ioctl SIOCGIFFLAGS");
1110
1135
}
1111
return 0;
1136
return false;
1112
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1113
1143
/* Reject the loopback device */
1114
if(ifr.ifr_flags & IFF_LOOPBACK){
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1115
1145
if(debug){
1116
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1117
if_entry->d_name);
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1118
1148
}
1119
return 0;
1149
return false;
1120
1150
}
1121
1151
/* Accept point-to-point devices only if connect_to is specified */
1122
if(connect_to != NULL and (ifr.ifr_flags & IFF_POINTOPOINT)){
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1123
1153
if(debug){
1124
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1125
if_entry->d_name);
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1126
1156
}
1127
return 1;
1157
return true;
1128
1158
}
1129
1159
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr.ifr_flags & IFF_BROADCAST)){
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
1161
if(debug){
1132
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1133
if_entry->d_name);
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1134
1164
}
1135
return 0;
1165
return false;
1136
1166
}
1137
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1138
if(ifr.ifr_flags & IFF_NOARP){
1168
if(ifr->ifr_flags & IFF_NOARP){
1139
1169
if(debug){
1140
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1141
if_entry->d_name);
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1142
1172
}
1143
return 0;
1173
return false;
1144
1174
}
1175
1145
1176
/* Accept this device */
1146
1177
if(debug){
1147
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1148
if_entry->d_name);
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1149
1247
}
1150
1248
return 1;
1151
1249
}
1161
1259
return 1;
1162
1260
}
1163
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
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
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1164
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1165
1324
int ret;
1166
1325
struct timespec now;
1170
1329
while(true){
1171
1330
if(mc.current_server == NULL){
1172
1331
if (debug){
1173
fprintf(stderr,
1174
"Wait until first server is found. No timeout!\n");
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1175
1334
}
1176
1335
ret = avahi_simple_poll_iterate(s, -1);
1177
1336
} else {
1178
1337
if (debug){
1179
fprintf(stderr, "Check current_server if we should run it,"
1180
" or wait\n");
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1181
1340
}
1182
1341
/* the current time */
1183
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1199
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1200
1359
1201
1360
if (debug){
1202
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1203
1363
}
1204
1364
1205
1365
if(block_time <= 0){
1225
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1226
1386
}
1227
1387
if(ret != 0){
1228
if (ret > 0 or errno != EINTR) {
1388
if (ret > 0 or errno != EINTR){
1229
1389
return (ret != 1) ? ret : 0;
1230
1390
}
1231
1391
}
1232
1392
}
1233
1393
}
1234
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
1235
1684
int main(int argc, char *argv[]){
1236
1685
AvahiSServiceBrowser *sb = NULL;
1237
1686
int error;
1243
1692
struct ifreq network;
1244
1693
int sd = -1;
1245
1694
bool take_down_interface = false;
1246
uid_t uid;
1247
gid_t gid;
1248
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1249
1696
bool tempdir_created = false;
1250
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1317
1764
.group = 2 },
1318
1765
{ .name = "retry", .key = 132,
1319
1766
.arg = "SECONDS",
1320
.doc = "Retry interval used when denied by the mandos server",
1767
.doc = "Retry interval used when denied by the Mandos server",
1768
.group = 2 },
1769
{ .name = "network-hook-dir", .key = 133,
1770
.arg = "DIR",
1771
.doc = "Directory where network hooks are located",
1321
1772
.group = 2 },
1322
1773
/*
1323
1774
* These reproduce what we would get without ARGP_NO_HELP
1377
1828
argp_error(state, "Bad retry interval");
1378
1829
}
1379
1830
break;
1831
case 133: /* --network-hook-dir */
1832
hookdir = arg;
1833
break;
1380
1834
/*
1381
1835
* These reproduce what we would get without ARGP_NO_HELP
1382
1836
*/
1388
1842
argp_state_help(state, state->out_stream,
1389
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1390
1844
case 'V': /* --version */
1391
fprintf(state->out_stream, "%s\n", argp_program_version);
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1392
1846
exit(argp_err_exit_status);
1393
1847
break;
1394
1848
default:
1421
1875
{
1422
1876
/* Work around Debian bug #633582:
1423
1877
<http://bugs.debian.org/633582> */
1424
struct stat st;
1425
1878
1426
1879
/* Re-raise priviliges */
1427
errno = 0;
1428
ret = seteuid(0);
1429
if(ret == -1){
1430
perror_plus("seteuid");
1431
}
1432
1433
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1434
int seckey_fd = open(seckey, O_RDONLY);
1435
if(seckey_fd == -1){
1436
perror_plus("open");
1437
} else {
1438
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1439
if(ret == -1){
1440
perror_plus("fstat");
1441
} else {
1442
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1443
ret = fchown(seckey_fd, uid, gid);
1444
if(ret == -1){
1445
perror_plus("fchown");
1446
}
1447
}
1448
}
1449
TEMP_FAILURE_RETRY(close(seckey_fd));
1450
}
1451
}
1452
1453
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1454
int pubkey_fd = open(pubkey, O_RDONLY);
1455
if(pubkey_fd == -1){
1456
perror_plus("open");
1457
} else {
1458
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1459
if(ret == -1){
1460
perror_plus("fstat");
1461
} else {
1462
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1463
ret = fchown(pubkey_fd, uid, gid);
1464
if(ret == -1){
1465
perror_plus("fchown");
1466
}
1467
}
1468
}
1469
TEMP_FAILURE_RETRY(close(pubkey_fd));
1470
}
1471
}
1472
1473
/* Lower privileges */
1474
errno = 0;
1475
ret = seteuid(uid);
1476
if(ret == -1){
1477
perror_plus("seteuid");
1478
}
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
}
1931
}
1932
}
1933
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1479
1937
}
1480
1938
1481
1939
if(not debug){
1482
1940
avahi_set_log_function(empty_log);
1483
1941
}
1484
1942
1485
1943
if(interface[0] == '\0'){
1486
1944
struct dirent **direntries;
1487
ret = scandir(sys_class_net, &direntries, good_interface,
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1488
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1489
1954
if(ret >= 1){
1490
/* Pick the first good interface */
1955
/* Pick the first interface returned */
1491
1956
interface = strdup(direntries[0]->d_name);
1492
1957
if(debug){
1493
fprintf(stderr, "Using interface \"%s\"\n", interface);
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1494
1959
}
1495
1960
if(interface == NULL){
1496
1961
perror_plus("malloc");
1501
1966
free(direntries);
1502
1967
} else {
1503
1968
free(direntries);
1504
fprintf(stderr, "Could not find a network interface\n");
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1505
1970
exitcode = EXIT_FAILURE;
1506
1971
goto end;
1507
1972
}
1513
1978
srand((unsigned int) time(NULL));
1514
1979
mc.simple_poll = avahi_simple_poll_new();
1515
1980
if(mc.simple_poll == NULL){
1516
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1517
1983
exitcode = EX_UNAVAILABLE;
1518
1984
goto end;
1519
1985
}
1582
2048
}
1583
2049
1584
2050
/* If the interface is down, bring it up */
1585
if(strcmp(interface, "none") != 0){
1586
if_index = (AvahiIfIndex) if_nametoindex(interface);
1587
if(if_index == 0){
1588
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1589
exitcode = EX_UNAVAILABLE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
/* Re-raise priviliges */
1598
errno = 0;
1599
ret = seteuid(0);
1600
if(ret == -1){
1601
perror_plus("seteuid");
1602
}
1603
1604
#ifdef __linux__
1605
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1606
messages about the network interface to mess up the prompt */
1607
ret = klogctl(8, NULL, 5);
1608
bool restore_loglevel = true;
1609
if(ret == -1){
1610
restore_loglevel = false;
1611
perror_plus("klogctl");
1612
}
1613
#endif /* __linux__ */
1614
1615
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1616
if(sd < 0){
1617
perror_plus("socket");
1618
exitcode = EX_OSERR;
1619
#ifdef __linux__
1620
if(restore_loglevel){
1621
ret = klogctl(7, NULL, 0);
1622
if(ret == -1){
1623
perror_plus("klogctl");
1624
}
1625
}
1626
#endif /* __linux__ */
1627
/* Lower privileges */
1628
errno = 0;
1629
ret = seteuid(uid);
1630
if(ret == -1){
1631
perror_plus("seteuid");
1632
}
1633
goto end;
1634
}
1635
strcpy(network.ifr_name, interface);
1636
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1637
if(ret == -1){
1638
perror_plus("ioctl SIOCGIFFLAGS");
1639
#ifdef __linux__
1640
if(restore_loglevel){
1641
ret = klogctl(7, NULL, 0);
1642
if(ret == -1){
1643
perror_plus("klogctl");
1644
}
1645
}
1646
#endif /* __linux__ */
1647
exitcode = EX_OSERR;
1648
/* Lower privileges */
1649
errno = 0;
1650
ret = seteuid(uid);
1651
if(ret == -1){
1652
perror_plus("seteuid");
1653
}
1654
goto end;
1655
}
1656
if((network.ifr_flags & IFF_UP) == 0){
1657
network.ifr_flags |= IFF_UP;
1658
take_down_interface = true;
1659
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1660
if(ret == -1){
1661
take_down_interface = false;
1662
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1663
exitcode = EX_OSERR;
1664
#ifdef __linux__
1665
if(restore_loglevel){
1666
ret = klogctl(7, NULL, 0);
1667
if(ret == -1){
1668
perror_plus("klogctl");
1669
}
1670
}
1671
#endif /* __linux__ */
1672
/* Lower privileges */
1673
errno = 0;
1674
ret = seteuid(uid);
1675
if(ret == -1){
1676
perror_plus("seteuid");
1677
}
1678
goto end;
1679
}
1680
}
1681
/* Sleep checking until interface is running.
1682
Check every 0.25s, up to total time of delay */
1683
for(int i=0; i < delay * 4; i++){
1684
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1685
if(ret == -1){
1686
perror_plus("ioctl SIOCGIFFLAGS");
1687
} else if(network.ifr_flags & IFF_RUNNING){
1688
break;
1689
}
1690
struct timespec sleeptime = { .tv_nsec = 250000000 };
1691
ret = nanosleep(&sleeptime, NULL);
1692
if(ret == -1 and errno != EINTR){
1693
perror_plus("nanosleep");
1694
}
1695
}
1696
if(not take_down_interface){
1697
/* We won't need the socket anymore */
1698
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1699
if(ret == -1){
1700
perror_plus("close");
1701
}
1702
}
1703
#ifdef __linux__
1704
if(restore_loglevel){
1705
/* Restores kernel loglevel to default */
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
if(take_down_interface){
1715
/* Lower privileges */
1716
ret = seteuid(uid);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
}
1720
} else {
1721
/* Lower privileges permanently */
1722
ret = setuid(uid);
1723
if(ret == -1){
1724
perror_plus("setuid");
1725
}
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");
1726
2056
}
1727
2057
}
1728
2058
1732
2062
1733
2063
ret = init_gnutls_global(pubkey, seckey);
1734
2064
if(ret == -1){
1735
fprintf(stderr, "init_gnutls_global failed\n");
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
1736
2066
exitcode = EX_UNAVAILABLE;
1737
2067
goto end;
1738
2068
} else {
1754
2084
}
1755
2085
1756
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
1757
fprintf(stderr, "init_gpgme failed\n");
2087
fprintf_plus(stderr, "init_gpgme failed\n");
1758
2088
exitcode = EX_UNAVAILABLE;
1759
2089
goto end;
1760
2090
} else {
1769
2099
/* Connect directly, do not use Zeroconf */
1770
2100
/* (Mainly meant for debugging) */
1771
2101
char *address = strrchr(connect_to, ':');
2102
1772
2103
if(address == NULL){
1773
fprintf(stderr, "No colon in address\n");
2104
fprintf_plus(stderr, "No colon in address\n");
1774
2105
exitcode = EX_USAGE;
1775
2106
goto end;
1776
2107
}
1784
2115
tmpmax = strtoimax(address+1, &tmp, 10);
1785
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1786
2117
or tmpmax != (uint16_t)tmpmax){
1787
fprintf(stderr, "Bad port number\n");
2118
fprintf_plus(stderr, "Bad port number\n");
1788
2119
exitcode = EX_USAGE;
1789
2120
goto end;
1790
2121
}
1820
2151
break;
1821
2152
}
1822
2153
if(debug){
1823
fprintf(stderr, "Retrying in %d seconds\n",
1824
(int)retry_interval);
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
(int)retry_interval);
1825
2156
}
1826
2157
sleep((int)retry_interval);
1827
2158
}
1829
2160
if (not quit_now){
1830
2161
exitcode = EXIT_SUCCESS;
1831
2162
}
1832
2163
1833
2164
goto end;
1834
2165
}
1835
2166
1857
2188
1858
2189
/* Check if creating the Avahi server object succeeded */
1859
2190
if(mc.server == NULL){
1860
fprintf(stderr, "Failed to create Avahi server: %s\n",
1861
avahi_strerror(error));
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
1862
2193
exitcode = EX_UNAVAILABLE;
1863
2194
goto end;
1864
2195
}
1872
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1873
2204
NULL, 0, browse_callback, NULL);
1874
2205
if(sb == NULL){
1875
fprintf(stderr, "Failed to create service browser: %s\n",
1876
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)));
1877
2208
exitcode = EX_UNAVAILABLE;
1878
2209
goto end;
1879
2210
}
1885
2216
/* Run the main loop */
1886
2217
1887
2218
if(debug){
1888
fprintf(stderr, "Starting Avahi loop search\n");
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
1889
2220
}
1890
2221
1891
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
1892
2223
(int)(retry_interval * 1000));
1893
2224
if(debug){
1894
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1895
(ret == 0) ? "successfully" : "with error");
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
(ret == 0) ? "successfully" : "with error");
1896
2227
}
1897
2228
1898
2229
end:
1899
2230
1900
2231
if(debug){
1901
fprintf(stderr, "%s exiting\n", argv[0]);
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1902
2233
}
1903
2234
1904
2235
/* Cleanup things */
1920
2251
if(gpgme_initialized){
1921
2252
gpgme_release(mc.ctx);
1922
2253
}
1923
2254
1924
2255
/* Cleans up the circular linked list of Mandos servers the client
1925
2256
has seen */
1926
2257
if(mc.current_server != NULL){
1932
2263
}
1933
2264
}
1934
2265
1935
/* Take down the network interface */
1936
if(take_down_interface){
1937
/* Re-raise priviliges */
1938
errno = 0;
1939
ret = seteuid(0);
1940
if(ret == -1){
1941
perror_plus("seteuid");
1942
}
1943
if(geteuid() == 0){
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
2270
{
2271
raise_privileges();
2272
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
1944
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1945
2276
if(ret == -1){
1946
2277
perror_plus("ioctl SIOCGIFFLAGS");
1947
} else if(network.ifr_flags & IFF_UP) {
2278
} else if(network.ifr_flags & IFF_UP){
1948
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1949
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1950
2281
if(ret == -1){
1955
2286
if(ret == -1){
1956
2287
perror_plus("close");
1957
2288
}
1958
/* Lower privileges permanently */
1959
errno = 0;
1960
ret = setuid(uid);
1961
if(ret == -1){
1962
perror_plus("setuid");
1963
}
1964
2289
}
1965
2290
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
1966
2297
1967
2298
/* Removes the GPGME temp directory and all files inside */
1968
2299
if(tempdir_created){
1982
2313
}
1983
2314
ret = remove(fullname);
1984
2315
if(ret == -1){
1985
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1986
strerror(errno));
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
1987
2318
}
1988
2319
free(fullname);
1989
2320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0