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- Committer: Teddy Hogeborn
- Date: 2011-10-08 21:13:46 UTC
- mfrom: (510 trunk)
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 511.
- Revision ID: teddy@recompile.se-20111008211346-z1r0xsk8ak8b04wf
* debian/source/local-options: New; contains "--single-debian-patch".
- files removed:
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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(), _exit() */
76
setgid(), pause() */
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() */
91
88
92
89
#ifdef __linux__
93
90
#include <sys/klog.h> /* klogctl() */
111
108
init_gnutls_session(),
112
109
GNUTLS_* */
113
110
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
116
113
117
114
/* GPGME */
118
115
#include <gpgme.h> /* All GPGME types, constants and
126
123
#define PATHDIR "/conf/conf.d/mandos"
127
124
#define SECKEY "seckey.txt"
128
125
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
126
131
127
bool debug = false;
132
128
static const char mandos_protocol_version[] = "1";
134
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
131
static const char sys_class_net[] = "/sys/class/net";
136
132
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
133
141
134
/* Doubly linked list that need to be circularly linked when used */
142
135
typedef struct server{
172
165
173
166
/* Function to use when printing errors */
174
167
void perror_plus(const char *print_text){
175
int e = errno;
176
168
fprintf(stderr, "Mandos plugin %s: ",
177
169
program_invocation_short_name);
178
errno = e;
179
170
perror(print_text);
180
171
}
181
172
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
192
173
/*
193
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
175
* bytes. "buffer_capacity" is how much is currently allocated,
195
176
* "buffer_length" is how much is already used.
196
177
*/
197
178
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
179
size_t buffer_capacity){
199
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
182
if(buffer == NULL){
207
188
}
208
189
209
190
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
212
194
int ret;
213
195
server *new_server = malloc(sizeof(server));
214
196
if(new_server == NULL){
215
197
perror_plus("malloc");
216
return false;
198
return -1;
217
199
}
218
200
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
222
204
if(new_server->ip == NULL){
223
205
perror_plus("strdup");
224
return false;
206
return -1;
225
207
}
226
208
/* Special case of first server */
227
209
if (mc.current_server == NULL){
238
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
221
if(ret == -1){
240
222
perror_plus("clock_gettime");
241
return false;
223
return -1;
242
224
}
243
return true;
225
return 0;
244
226
}
245
227
246
228
/*
247
229
* Initialize GPGME.
248
230
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
251
233
gpgme_error_t rc;
252
234
gpgme_engine_info_t engine_info;
253
235
268
250
269
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
252
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
273
255
return false;
274
256
}
275
257
276
258
rc = gpgme_op_import(mc.ctx, pgp_data);
277
259
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
280
262
return false;
281
263
}
282
264
289
271
}
290
272
291
273
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
293
275
}
294
276
295
277
/* Init GPGME */
296
278
gpgme_check_version(NULL);
297
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
280
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
301
283
return false;
302
284
}
303
285
304
286
/* Set GPGME home directory for the OpenPGP engine only */
305
287
rc = gpgme_get_engine_info(&engine_info);
306
288
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
309
291
return false;
310
292
}
311
293
while(engine_info != NULL){
317
299
engine_info = engine_info->next;
318
300
}
319
301
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
303
return false;
323
304
}
324
305
325
306
/* Create new GPGME "context" */
326
307
rc = gpgme_new(&(mc.ctx));
327
308
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
331
311
return false;
332
312
}
333
313
352
332
ssize_t plaintext_length = 0;
353
333
354
334
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
336
}
357
337
358
338
/* Create new GPGME data buffer from memory cryptotext */
359
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
340
0);
361
341
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
364
344
return -1;
365
345
}
366
346
367
347
/* Create new empty GPGME data buffer for the plaintext */
368
348
rc = gpgme_data_new(&dh_plain);
369
349
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
373
352
gpgme_data_release(dh_crypto);
374
353
return -1;
375
354
}
378
357
data buffer */
379
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
359
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
383
362
plaintext_length = -1;
384
363
if(debug){
385
364
gpgme_decrypt_result_t result;
386
365
result = gpgme_op_decrypt_result(mc.ctx);
387
366
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
368
} else {
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);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
394
373
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
396
375
}
397
376
gpgme_recipient_t recipient;
398
377
recipient = result->recipients;
399
378
while(recipient != NULL){
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");
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");
407
385
recipient = recipient->next;
408
386
}
409
387
}
412
390
}
413
391
414
392
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
394
}
417
395
418
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
425
403
*plaintext = NULL;
426
404
while(true){
427
405
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
430
408
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
434
412
}
435
413
436
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
427
}
450
428
451
429
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
453
431
for(ssize_t i = 0; i < plaintext_length; i++){
454
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
433
}
477
455
/* GnuTLS log function callback */
478
456
static void debuggnutls(__attribute__((unused)) int level,
479
457
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
481
459
}
482
460
483
461
static int init_gnutls_global(const char *pubkeyfilename,
485
463
int ret;
486
464
487
465
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
489
467
}
490
468
491
469
ret = gnutls_global_init();
492
470
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
495
473
return -1;
496
474
}
497
475
506
484
/* OpenPGP credentials */
507
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
486
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
511
489
gnutls_global_deinit();
512
490
return -1;
513
491
}
514
492
515
493
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
520
497
}
521
498
522
499
ret = gnutls_certificate_set_openpgp_key_file
523
500
(mc.cred, pubkeyfilename, seckeyfilename,
524
501
GNUTLS_OPENPGP_FMT_BASE64);
525
502
if(ret != GNUTLS_E_SUCCESS){
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));
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));
531
508
goto globalfail;
532
509
}
533
510
534
511
/* GnuTLS server initialization */
535
512
ret = gnutls_dh_params_init(&mc.dh_params);
536
513
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
540
516
goto globalfail;
541
517
}
542
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
519
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
546
522
goto globalfail;
547
523
}
548
524
568
544
}
569
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
546
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
574
549
}
575
550
576
551
{
583
558
}
584
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
560
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
589
564
gnutls_deinit(*session);
590
565
return -1;
591
566
}
600
575
}
601
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
577
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
605
580
gnutls_deinit(*session);
606
581
return -1;
607
582
}
652
627
pf = PF_INET;
653
628
break;
654
629
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
656
631
errno = EINVAL;
657
632
return -1;
658
633
}
663
638
}
664
639
665
640
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
668
643
}
669
644
670
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
696
671
}
697
672
if(ret == 0){
698
673
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
700
675
errno = e;
701
676
goto mandos_end;
702
677
}
707
682
708
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
685
-Wunreachable-code*/
711
686
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
714
689
errno = EINVAL;
715
690
goto mandos_end;
716
691
}
734
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
710
perror_plus("if_indextoname");
736
711
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
739
714
}
740
715
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
743
718
}
744
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
755
730
perror_plus("inet_ntop");
756
731
} else {
757
732
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
734
}
760
735
}
761
736
}
789
764
while(true){
790
765
size_t out_size = strlen(out);
791
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
767
out_size - written));
793
768
if(ret == -1){
794
769
int e = errno;
795
770
perror_plus("write");
815
790
}
816
791
817
792
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
819
794
}
820
795
821
796
if(quit_now){
823
798
goto mandos_end;
824
799
}
825
800
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);
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
831
803
832
804
if(quit_now){
833
805
errno = EINTR;
844
816
845
817
if(ret != GNUTLS_E_SUCCESS){
846
818
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
820
gnutls_perror(ret);
849
821
}
850
822
errno = EPROTO;
854
826
/* Read OpenPGP packet that contains the wanted password */
855
827
856
828
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
859
831
}
860
832
861
833
while(true){
866
838
}
867
839
868
840
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
841
buffer_capacity);
870
842
if(buffer_capacity == 0){
871
843
int e = errno;
872
844
perror_plus("incbuffer");
899
871
}
900
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
873
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
875
gnutls_perror(ret);
905
876
errno = EPROTO;
906
877
goto mandos_end;
907
878
}
908
879
break;
909
880
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
912
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
884
errno = EIO;
914
885
goto mandos_end;
919
890
}
920
891
921
892
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
923
894
}
924
895
925
896
if(quit_now){
937
908
938
909
if(buffer_length > 0){
939
910
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
941
913
&decrypted_buffer);
942
914
if(decrypted_buffer_size >= 0){
943
915
954
926
if(ret == 0 and ferror(stdout)){
955
927
int e = errno;
956
928
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
959
931
}
960
932
errno = e;
961
933
goto mandos_end;
1018
990
switch(event){
1019
991
default:
1020
992
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
1025
996
break;
1026
997
1027
998
case AVAHI_RESOLVER_FOUND:
1029
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1030
1001
avahi_address_snprint(ip, sizeof(ip), address);
1031
1002
if(debug){
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);
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);
1035
1006
}
1036
1007
int ret = start_mandos_communication(ip, port, interface,
1037
1008
avahi_proto_to_af(proto));
1038
1009
if(ret == 0){
1039
1010
avahi_simple_poll_quit(mc.simple_poll);
1040
1011
} else {
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
}
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1046
1014
}
1047
1015
}
1048
1016
}
1072
1040
default:
1073
1041
case AVAHI_BROWSER_FAILURE:
1074
1042
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1077
1045
avahi_simple_poll_quit(mc.simple_poll);
1078
1046
return;
1079
1047
1086
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
1055
name, type, domain, protocol, 0,
1088
1056
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1092
1059
break;
1093
1060
1094
1061
case AVAHI_BROWSER_REMOVE:
1097
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
1066
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
1068
}
1103
1069
break;
1104
1070
}
1119
1085
errno = old_errno;
1120
1086
}
1121
1087
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
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;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1133
1144
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1135
1147
}
1136
return false;
1148
free(flagstring);
1149
return 0;
1137
1150
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1143
1153
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1145
1155
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1148
1158
}
1149
return false;
1159
return 0;
1150
1160
}
1151
1161
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1153
1163
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1156
1166
}
1157
return true;
1167
return 1;
1158
1168
}
1159
1169
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1161
1171
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1164
1174
}
1165
return false;
1175
return 0;
1166
1176
}
1167
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1169
1179
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1172
1182
}
1173
return false;
1183
return 0;
1174
1184
}
1175
1176
1185
/* Accept this device */
1177
1186
if(debug){
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;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1247
1189
}
1248
1190
return 1;
1249
1191
}
1259
1201
return 1;
1260
1202
}
1261
1203
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
1323
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
1205
int ret;
1325
1206
struct timespec now;
1329
1210
while(true){
1330
1211
if(mc.current_server == NULL){
1331
1212
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1334
1215
}
1335
1216
ret = avahi_simple_poll_iterate(s, -1);
1336
1217
} else {
1337
1218
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1340
1221
}
1341
1222
/* the current time */
1342
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1358
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1240
1360
1241
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1363
1243
}
1364
1244
1365
1245
if(block_time <= 0){
1385
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
1266
}
1387
1267
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1389
1269
return (ret != 1) ? ret : 0;
1390
1270
}
1391
1271
}
1392
1272
}
1393
1273
}
1394
1274
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
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
return EX_UNAVAILABLE;
1572
}
1573
1574
if(quit_now){
1575
return EINTR;
1576
}
1577
1578
/* Re-raise priviliges */
1579
raise_privileges();
1580
1581
#ifdef __linux__
1582
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1583
messages about the network interface to mess up the prompt */
1584
ret = klogctl(8, NULL, 5);
1585
bool restore_loglevel = true;
1586
if(ret == -1){
1587
restore_loglevel = false;
1588
perror_plus("klogctl");
1589
}
1590
#endif /* __linux__ */
1591
1592
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1593
if(sd < 0){
1594
perror_plus("socket");
1595
#ifdef __linux__
1596
if(restore_loglevel){
1597
ret = klogctl(7, NULL, 0);
1598
if(ret == -1){
1599
perror_plus("klogctl");
1600
}
1601
}
1602
#endif /* __linux__ */
1603
/* Lower privileges */
1604
lower_privileges();
1605
return EX_OSERR;
1606
;
1607
}
1608
strcpy(network.ifr_name, interface);
1609
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1610
if(ret == -1){
1611
perror_plus("ioctl SIOCGIFFLAGS");
1612
#ifdef __linux__
1613
if(restore_loglevel){
1614
ret = klogctl(7, NULL, 0);
1615
if(ret == -1){
1616
perror_plus("klogctl");
1617
}
1618
}
1619
#endif /* __linux__ */
1620
/* Lower privileges */
1621
lower_privileges();
1622
return EX_OSERR;
1623
}
1624
if((network.ifr_flags & IFF_UP) == 0){
1625
network.ifr_flags |= IFF_UP;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1629
#ifdef __linux__
1630
if(restore_loglevel){
1631
ret = klogctl(7, NULL, 0);
1632
if(ret == -1){
1633
perror_plus("klogctl");
1634
}
1635
}
1636
#endif /* __linux__ */
1637
/* Lower privileges */
1638
lower_privileges();
1639
return EX_OSERR;
1640
}
1641
}
1642
/* Sleep checking until interface is running.
1643
Check every 0.25s, up to total time of delay */
1644
for(int i=0; i < delay * 4; i++){
1645
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1646
if(ret == -1){
1647
perror_plus("ioctl SIOCGIFFLAGS");
1648
} else if(network.ifr_flags & IFF_RUNNING){
1649
break;
1650
}
1651
struct timespec sleeptime = { .tv_nsec = 250000000 };
1652
ret = nanosleep(&sleeptime, NULL);
1653
if(ret == -1 and errno != EINTR){
1654
perror_plus("nanosleep");
1655
}
1656
}
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
#ifdef __linux__
1663
if(restore_loglevel){
1664
/* Restores kernel loglevel to default */
1665
ret = klogctl(7, NULL, 0);
1666
if(ret == -1){
1667
perror_plus("klogctl");
1668
}
1669
}
1670
#endif /* __linux__ */
1671
/* Lower privileges */
1672
lower_privileges();
1673
return errno;
1674
}
1675
1676
1275
int main(int argc, char *argv[]){
1677
1276
AvahiSServiceBrowser *sb = NULL;
1678
1277
int error;
1684
1283
struct ifreq network;
1685
1284
int sd = -1;
1686
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1687
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1688
1289
bool tempdir_created = false;
1689
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1756
1357
.group = 2 },
1757
1358
{ .name = "retry", .key = 132,
1758
1359
.arg = "SECONDS",
1759
.doc = "Retry interval used when denied by the Mandos server",
1760
.group = 2 },
1761
{ .name = "network-hook-dir", .key = 133,
1762
.arg = "DIR",
1763
.doc = "Directory where network hooks are located",
1360
.doc = "Retry interval used when denied by the mandos server",
1764
1361
.group = 2 },
1765
1362
/*
1766
1363
* These reproduce what we would get without ARGP_NO_HELP
1820
1417
argp_error(state, "Bad retry interval");
1821
1418
}
1822
1419
break;
1823
case 133: /* --network-hook-dir */
1824
hookdir = arg;
1825
break;
1826
1420
/*
1827
1421
* These reproduce what we would get without ARGP_NO_HELP
1828
1422
*/
1834
1428
argp_state_help(state, state->out_stream,
1835
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1836
1430
case 'V': /* --version */
1837
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1838
1432
exit(argp_err_exit_status);
1839
1433
break;
1840
1434
default:
1867
1461
{
1868
1462
/* Work around Debian bug #633582:
1869
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1870
1465
1871
1466
/* Re-raise priviliges */
1872
if(raise_privileges() == 0){
1873
struct stat st;
1874
1875
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1876
int seckey_fd = open(seckey, O_RDONLY);
1877
if(seckey_fd == -1){
1878
perror_plus("open");
1879
} else {
1880
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1881
if(ret == -1){
1882
perror_plus("fstat");
1883
} else {
1884
if(S_ISREG(st.st_mode)
1885
and st.st_uid == 0 and st.st_gid == 0){
1886
ret = fchown(seckey_fd, uid, gid);
1887
if(ret == -1){
1888
perror_plus("fchown");
1889
}
1890
}
1891
}
1892
TEMP_FAILURE_RETRY(close(seckey_fd));
1893
}
1894
}
1895
1896
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1897
int pubkey_fd = open(pubkey, O_RDONLY);
1898
if(pubkey_fd == -1){
1899
perror_plus("open");
1900
} else {
1901
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1902
if(ret == -1){
1903
perror_plus("fstat");
1904
} else {
1905
if(S_ISREG(st.st_mode)
1906
and st.st_uid == 0 and st.st_gid == 0){
1907
ret = fchown(pubkey_fd, uid, gid);
1908
if(ret == -1){
1909
perror_plus("fchown");
1910
}
1911
}
1912
}
1913
TEMP_FAILURE_RETRY(close(pubkey_fd));
1914
}
1915
}
1916
1917
/* Lower privileges */
1918
errno = 0;
1919
ret = seteuid(uid);
1920
if(ret == -1){
1921
perror_plus("seteuid");
1922
}
1923
}
1924
}
1925
1926
/* Run network hooks */
1927
if(not run_network_hooks("start", interface, delay)){
1928
goto end;
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1929
1519
}
1930
1520
1931
1521
if(not debug){
1932
1522
avahi_set_log_function(empty_log);
1933
1523
}
1934
1524
1935
1525
if(interface[0] == '\0'){
1936
1526
struct dirent **direntries;
1937
/* First look for interfaces that are up */
1938
ret = scandir(sys_class_net, &direntries, up_interface,
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1939
1528
alphasort);
1940
if(ret == 0){
1941
/* No up interfaces, look for any good interfaces */
1942
free(direntries);
1943
ret = scandir(sys_class_net, &direntries, good_interface,
1944
alphasort);
1945
}
1946
1529
if(ret >= 1){
1947
/* Pick the first interface returned */
1530
/* Pick the first good interface */
1948
1531
interface = strdup(direntries[0]->d_name);
1949
1532
if(debug){
1950
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1951
1534
}
1952
1535
if(interface == NULL){
1953
1536
perror_plus("malloc");
1958
1541
free(direntries);
1959
1542
} else {
1960
1543
free(direntries);
1961
fprintf_plus(stderr, "Could not find a network interface\n");
1544
fprintf(stderr, "Could not find a network interface\n");
1962
1545
exitcode = EXIT_FAILURE;
1963
1546
goto end;
1964
1547
}
1970
1553
srand((unsigned int) time(NULL));
1971
1554
mc.simple_poll = avahi_simple_poll_new();
1972
1555
if(mc.simple_poll == NULL){
1973
fprintf_plus(stderr,
1974
"Avahi: Failed to create simple poll object.\n");
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1975
1557
exitcode = EX_UNAVAILABLE;
1976
1558
goto end;
1977
1559
}
2040
1622
}
2041
1623
2042
1624
/* If the interface is down, bring it up */
2043
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2044
ret = bring_up_interface(interface, delay);
2045
if(ret){
2046
errno = ret;
2047
perror_plus("Failed to bring up interface");
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
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
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
2048
1766
}
2049
1767
}
2050
1768
2054
1772
2055
1773
ret = init_gnutls_global(pubkey, seckey);
2056
1774
if(ret == -1){
2057
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2058
1776
exitcode = EX_UNAVAILABLE;
2059
1777
goto end;
2060
1778
} else {
2076
1794
}
2077
1795
2078
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
2079
fprintf_plus(stderr, "init_gpgme failed\n");
1797
fprintf(stderr, "init_gpgme failed\n");
2080
1798
exitcode = EX_UNAVAILABLE;
2081
1799
goto end;
2082
1800
} else {
2091
1809
/* Connect directly, do not use Zeroconf */
2092
1810
/* (Mainly meant for debugging) */
2093
1811
char *address = strrchr(connect_to, ':');
2094
2095
1812
if(address == NULL){
2096
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2097
1814
exitcode = EX_USAGE;
2098
1815
goto end;
2099
1816
}
2107
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2108
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2109
1826
or tmpmax != (uint16_t)tmpmax){
2110
fprintf_plus(stderr, "Bad port number\n");
1827
fprintf(stderr, "Bad port number\n");
2111
1828
exitcode = EX_USAGE;
2112
1829
goto end;
2113
1830
}
2143
1860
break;
2144
1861
}
2145
1862
if(debug){
2146
fprintf_plus(stderr, "Retrying in %d seconds\n",
2147
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2148
1865
}
2149
1866
sleep((int)retry_interval);
2150
1867
}
2152
1869
if (not quit_now){
2153
1870
exitcode = EXIT_SUCCESS;
2154
1871
}
2155
1872
2156
1873
goto end;
2157
1874
}
2158
1875
2180
1897
2181
1898
/* Check if creating the Avahi server object succeeded */
2182
1899
if(mc.server == NULL){
2183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2184
avahi_strerror(error));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2185
1902
exitcode = EX_UNAVAILABLE;
2186
1903
goto end;
2187
1904
}
2195
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2196
1913
NULL, 0, browse_callback, NULL);
2197
1914
if(sb == NULL){
2198
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2199
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2200
1917
exitcode = EX_UNAVAILABLE;
2201
1918
goto end;
2202
1919
}
2208
1925
/* Run the main loop */
2209
1926
2210
1927
if(debug){
2211
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2212
1929
}
2213
1930
2214
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
2215
1932
(int)(retry_interval * 1000));
2216
1933
if(debug){
2217
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2218
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2219
1936
}
2220
1937
2221
1938
end:
2222
1939
2223
1940
if(debug){
2224
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2225
1942
}
2226
1943
2227
1944
/* Cleanup things */
2243
1960
if(gpgme_initialized){
2244
1961
gpgme_release(mc.ctx);
2245
1962
}
2246
1963
2247
1964
/* Cleans up the circular linked list of Mandos servers the client
2248
1965
has seen */
2249
1966
if(mc.current_server != NULL){
2255
1972
}
2256
1973
}
2257
1974
2258
/* Run network hooks */
2259
run_network_hooks("stop", interface, delay);
2260
2261
/* Re-raise priviliges */
2262
{
2263
raise_privileges();
2264
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
2267
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2268
1985
if(ret == -1){
2269
1986
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
1987
} else if(network.ifr_flags & IFF_UP) {
2271
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2273
1990
if(ret == -1){
2278
1995
if(ret == -1){
2279
1996
perror_plus("close");
2280
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2281
2004
}
2282
2005
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2289
2006
2290
2007
/* Removes the GPGME temp directory and all files inside */
2291
2008
if(tempdir_created){
2305
2022
}
2306
2023
ret = remove(fullname);
2307
2024
if(ret == -1){
2308
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2309
strerror(errno));
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2310
2027
}
2311
2028
free(fullname);
2312
2029
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0