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» Revision
24.1.149
(compared to revision 237.16.5)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2010-08-22 13:34:42 UTC
- mfrom: (237.5.2 mandos)
- mto: (24.1.154 mandos) (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100822133442-rbx6xls26j2sejky
Changed ForkingMixIn in favor of multiprocessing
Added approval functionallity
Added approval functionallity
- files removed:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), 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() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
87
91
88
#ifdef __linux__
92
89
#include <sys/klog.h> /* klogctl() */
125
122
#define PATHDIR "/conf/conf.d/mandos"
126
123
#define SECKEY "seckey.txt"
127
124
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
125
130
126
bool debug = false;
131
127
static const char mandos_protocol_version[] = "1";
132
128
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
130
149
131
/* Used for passing in values through the Avahi callback functions */
150
132
typedef struct {
155
137
gnutls_dh_params_t dh_params;
156
138
const char *priority;
157
139
gpgme_ctx_t ctx;
158
server *current_server;
159
140
} mandos_context;
160
141
161
142
/* global context so signal handler can reach it*/
162
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
144
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
146
167
147
sig_atomic_t quit_now = 0;
168
148
int signal_received = 0;
169
149
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
150
/*
178
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
152
* bytes. "buffer_capacity" is how much is currently allocated,
191
164
return buffer_capacity;
192
165
}
193
166
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
232
167
/*
233
168
* Initialize GPGME.
234
169
*/
248
183
249
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
250
185
if(fd == -1){
251
perror_plus("open");
186
perror("open");
252
187
return false;
253
188
}
254
189
255
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
191
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
259
193
gpgme_strsource(rc), gpgme_strerror(rc));
260
194
return false;
261
195
}
262
196
263
197
rc = gpgme_op_import(mc.ctx, pgp_data);
264
198
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
267
200
gpgme_strsource(rc), gpgme_strerror(rc));
268
201
return false;
269
202
}
270
203
271
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
205
if(ret == -1){
273
perror_plus("close");
206
perror("close");
274
207
}
275
208
gpgme_data_release(pgp_data);
276
209
return true;
277
210
}
278
211
279
212
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
282
214
}
283
215
284
216
/* Init GPGME */
285
217
gpgme_check_version(NULL);
286
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
219
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
221
gpgme_strsource(rc), gpgme_strerror(rc));
291
222
return false;
292
223
}
293
224
294
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
295
226
rc = gpgme_get_engine_info(&engine_info);
296
227
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
229
gpgme_strsource(rc), gpgme_strerror(rc));
300
230
return false;
301
231
}
308
238
engine_info = engine_info->next;
309
239
}
310
240
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
313
242
return false;
314
243
}
315
244
316
245
/* Create new GPGME "context" */
317
246
rc = gpgme_new(&(mc.ctx));
318
247
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
322
250
return false;
323
251
}
324
252
343
271
ssize_t plaintext_length = 0;
344
272
345
273
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
275
}
349
276
350
277
/* Create new GPGME data buffer from memory cryptotext */
351
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
279
0);
353
280
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
356
282
gpgme_strsource(rc), gpgme_strerror(rc));
357
283
return -1;
358
284
}
360
286
/* Create new empty GPGME data buffer for the plaintext */
361
287
rc = gpgme_data_new(&dh_plain);
362
288
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
365
290
gpgme_strsource(rc), gpgme_strerror(rc));
366
291
gpgme_data_release(dh_crypto);
367
292
return -1;
371
296
data buffer */
372
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
373
298
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
300
gpgme_strsource(rc), gpgme_strerror(rc));
377
301
plaintext_length = -1;
378
302
if(debug){
379
303
gpgme_decrypt_result_t result;
380
304
result = gpgme_op_decrypt_result(mc.ctx);
381
305
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
307
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
308
fprintf(stderr, "Unsupported algorithm: %s\n",
387
309
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
310
fprintf(stderr, "Wrong key usage: %u\n",
390
311
result->wrong_key_usage);
391
312
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
394
314
}
395
315
gpgme_recipient_t recipient;
396
316
recipient = result->recipients;
397
317
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
318
fprintf(stderr, "Public key algorithm: %s\n",
400
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
405
322
recipient->status == GPG_ERR_NO_SECKEY
406
323
? "No" : "Yes");
407
324
recipient = recipient->next;
412
329
}
413
330
414
331
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
333
}
418
334
419
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
422
338
plaintext_length = -1;
423
339
goto decrypt_end;
424
340
}
429
345
(size_t)plaintext_length,
430
346
plaintext_capacity);
431
347
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
348
perror("incbuffer");
433
349
plaintext_length = -1;
434
350
goto decrypt_end;
435
351
}
442
358
break;
443
359
}
444
360
if(ret < 0){
445
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
446
362
plaintext_length = -1;
447
363
goto decrypt_end;
448
364
}
450
366
}
451
367
452
368
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
455
370
for(ssize_t i = 0; i < plaintext_length; i++){
456
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
372
}
479
394
/* GnuTLS log function callback */
480
395
static void debuggnutls(__attribute__((unused)) int level,
481
396
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
483
398
}
484
399
485
400
static int init_gnutls_global(const char *pubkeyfilename,
487
402
int ret;
488
403
489
404
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
492
406
}
493
407
494
408
ret = gnutls_global_init();
495
409
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
498
412
return -1;
499
413
}
500
414
507
421
}
508
422
509
423
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
511
425
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
514
431
gnutls_global_deinit();
515
432
return -1;
516
433
}
517
434
518
435
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
521
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
438
seckeyfilename);
523
439
}
527
443
GNUTLS_OPENPGP_FMT_BASE64);
528
444
if(ret != GNUTLS_E_SUCCESS){
529
445
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
535
450
goto globalfail;
536
451
}
537
452
538
453
/* GnuTLS server initialization */
539
454
ret = gnutls_dh_params_init(&mc.dh_params);
540
455
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
543
457
" %s\n", safer_gnutls_strerror(ret));
544
458
goto globalfail;
545
459
}
546
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
461
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
550
463
safer_gnutls_strerror(ret));
551
464
goto globalfail;
552
465
}
573
486
}
574
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
488
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
490
safer_gnutls_strerror(ret));
579
491
}
580
492
588
500
}
589
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
502
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
595
506
gnutls_deinit(*session);
596
507
return -1;
597
508
}
606
517
}
607
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
519
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
521
safer_gnutls_strerror(ret));
612
522
gnutls_deinit(*session);
613
523
return -1;
659
569
pf = PF_INET;
660
570
break;
661
571
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
664
573
errno = EINVAL;
665
574
return -1;
666
575
}
671
580
}
672
581
673
582
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
676
584
"\n", ip, port);
677
585
}
678
586
679
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
588
if(tcp_sd < 0){
681
589
int e = errno;
682
perror_plus("socket");
590
perror("socket");
683
591
errno = e;
684
592
goto mandos_end;
685
593
}
699
607
}
700
608
if(ret < 0 ){
701
609
int e = errno;
702
perror_plus("inet_pton");
610
perror("inet_pton");
703
611
errno = e;
704
612
goto mandos_end;
705
613
}
706
614
if(ret == 0){
707
615
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
710
617
errno = e;
711
618
goto mandos_end;
712
619
}
719
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
627
-Wunreachable-code*/
721
628
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
724
630
" without a network interface\n");
725
631
errno = EINVAL;
726
632
goto mandos_end;
743
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
650
char interface[IF_NAMESIZE];
745
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
652
perror("if_indextoname");
747
653
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
750
655
ip, interface, port);
751
656
}
752
657
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
755
660
}
756
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
764
669
sizeof(addrstr));
765
670
}
766
671
if(pcret == NULL){
767
perror_plus("inet_ntop");
672
perror("inet_ntop");
768
673
} else {
769
674
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
676
}
773
677
}
774
678
}
784
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
689
}
786
690
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
691
int e = errno;
692
perror("connect");
693
errno = e;
792
694
goto mandos_end;
793
695
}
794
696
805
707
out_size - written));
806
708
if(ret == -1){
807
709
int e = errno;
808
perror_plus("write");
710
perror("write");
809
711
errno = e;
810
712
goto mandos_end;
811
713
}
828
730
}
829
731
830
732
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
833
734
}
834
735
835
736
if(quit_now){
837
738
goto mandos_end;
838
739
}
839
740
840
/* Spurious warning from -Wint-to-pointer-cast */
841
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
742
843
743
if(quit_now){
855
755
856
756
if(ret != GNUTLS_E_SUCCESS){
857
757
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
860
759
gnutls_perror(ret);
861
760
}
862
761
errno = EPROTO;
866
765
/* Read OpenPGP packet that contains the wanted password */
867
766
868
767
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
871
770
}
872
771
873
772
while(true){
881
780
buffer_capacity);
882
781
if(buffer_capacity == 0){
883
782
int e = errno;
884
perror_plus("incbuffer");
783
perror("incbuffer");
885
784
errno = e;
886
785
goto mandos_end;
887
786
}
911
810
}
912
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
812
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
916
814
gnutls_perror(ret);
917
815
errno = EPROTO;
918
816
goto mandos_end;
919
817
}
920
818
break;
921
819
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
820
fprintf(stderr, "Unknown error while reading data from"
924
821
" encrypted session with Mandos server\n");
925
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
823
errno = EIO;
932
829
}
933
830
934
831
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
937
833
}
938
834
939
835
if(quit_now){
969
865
if(ret == 0 and ferror(stdout)){
970
866
int e = errno;
971
867
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
868
fprintf(stderr, "Error writing encrypted data: %s\n",
974
869
strerror(errno));
975
870
}
976
871
errno = e;
996
891
if(e == 0){
997
892
e = errno;
998
893
}
999
perror_plus("close");
894
perror("close");
1000
895
}
1001
896
gnutls_deinit(session);
1002
errno = e;
1003
897
if(quit_now){
1004
errno = EINTR;
898
e = EINTR;
1005
899
retval = -1;
1006
900
}
901
errno = e;
1007
902
}
1008
903
return retval;
1009
904
}
1034
929
switch(event){
1035
930
default:
1036
931
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1039
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
934
avahi_strerror(avahi_server_errno(mc.server)));
1041
935
break;
1045
939
char ip[AVAHI_ADDRESS_STR_MAX];
1046
940
avahi_address_snprint(ip, sizeof(ip), address);
1047
941
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1050
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
944
ip, (intmax_t)interface, port);
1052
945
}
1054
947
avahi_proto_to_af(proto));
1055
948
if(ret == 0){
1056
949
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1060
950
}
1061
951
}
1062
952
}
1086
976
default:
1087
977
case AVAHI_BROWSER_FAILURE:
1088
978
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
979
fprintf(stderr, "(Avahi browser) %s\n",
1091
980
avahi_strerror(avahi_server_errno(mc.server)));
1092
981
avahi_simple_poll_quit(mc.simple_poll);
1093
982
return;
1101
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
991
name, type, domain, protocol, 0,
1103
992
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1106
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1107
995
break;
1108
996
1112
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1002
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1117
1004
}
1118
1005
break;
1119
1006
}
1120
1007
}
1121
1008
1122
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1123
1010
static void handle_sigterm(int sig){
1124
1011
if(quit_now){
1125
1012
return;
1127
1014
quit_now = 1;
1128
1015
signal_received = sig;
1129
1016
int old_errno = errno;
1130
/* set main loop to exit */
1131
1017
if(mc.simple_poll != NULL){
1132
1018
avahi_simple_poll_quit(mc.simple_poll);
1133
1019
}
1134
1020
errno = old_errno;
1135
1021
}
1136
1022
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
1407
1023
int main(int argc, char *argv[]){
1408
1024
AvahiSServiceBrowser *sb = NULL;
1409
1025
int error;
1411
1027
intmax_t tmpmax;
1412
1028
char *tmp;
1413
1029
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1030
const char *interface = "eth0";
1415
1031
struct ifreq network;
1416
1032
int sd = -1;
1417
1033
bool take_down_interface = false;
1418
1034
uid_t uid;
1419
1035
gid_t gid;
1036
char *connect_to = NULL;
1420
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1421
1038
bool tempdir_created = false;
1422
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1426
1043
bool gnutls_initialized = false;
1427
1044
bool gpgme_initialized = false;
1428
1045
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
1046
1432
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1439
1054
errno = 0;
1440
1055
ret = setgid(gid);
1441
1056
if(ret == -1){
1442
perror_plus("setgid");
1057
perror("setgid");
1443
1058
}
1444
1059
1445
1060
/* Lower user privileges (temporarily) */
1446
1061
errno = 0;
1447
1062
ret = seteuid(uid);
1448
1063
if(ret == -1){
1449
perror_plus("seteuid");
1064
perror("seteuid");
1450
1065
}
1451
1066
1452
1067
if(quit_now){
1487
1102
.arg = "SECONDS",
1488
1103
.doc = "Maximum delay to wait for interface startup",
1489
1104
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
1105
/*
1499
1106
* These reproduce what we would get without ARGP_NO_HELP
1500
1107
*/
1544
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
1152
argp_error(state, "Bad delay");
1546
1153
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
1154
break;
1559
1155
/*
1560
1156
* These reproduce what we would get without ARGP_NO_HELP
1567
1163
argp_state_help(state, state->out_stream,
1568
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
1165
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
1167
exit(argp_err_exit_status);
1573
1168
break;
1589
1184
case ENOMEM:
1590
1185
default:
1591
1186
errno = ret;
1592
perror_plus("argp_parse");
1187
perror("argp_parse");
1593
1188
exitcode = EX_OSERR;
1594
1189
goto end;
1595
1190
case EINVAL:
1597
1192
goto end;
1598
1193
}
1599
1194
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
1753
}
1754
1195
1755
1196
if(not debug){
1756
1197
avahi_set_log_function(empty_log);
1757
1198
}
1758
1199
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
1201
from the signal handler */
1795
1202
/* Initialize the pseudo-RNG for Avahi */
1796
1203
srand((unsigned int) time(NULL));
1797
1204
mc.simple_poll = avahi_simple_poll_new();
1798
1205
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1801
1207
exitcode = EX_UNAVAILABLE;
1802
1208
goto end;
1803
1209
}
1805
1211
sigemptyset(&sigterm_action.sa_mask);
1806
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
1213
if(ret == -1){
1808
perror_plus("sigaddset");
1214
perror("sigaddset");
1809
1215
exitcode = EX_OSERR;
1810
1216
goto end;
1811
1217
}
1812
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
1219
if(ret == -1){
1814
perror_plus("sigaddset");
1220
perror("sigaddset");
1815
1221
exitcode = EX_OSERR;
1816
1222
goto end;
1817
1223
}
1818
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
1225
if(ret == -1){
1820
perror_plus("sigaddset");
1226
perror("sigaddset");
1821
1227
exitcode = EX_OSERR;
1822
1228
goto end;
1823
1229
}
1827
1233
*/
1828
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
1235
if(ret == -1){
1830
perror_plus("sigaction");
1236
perror("sigaction");
1831
1237
return EX_OSERR;
1832
1238
}
1833
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
1241
if(ret == -1){
1836
perror_plus("sigaction");
1242
perror("sigaction");
1837
1243
exitcode = EX_OSERR;
1838
1244
goto end;
1839
1245
}
1840
1246
}
1841
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
1248
if(ret == -1){
1843
perror_plus("sigaction");
1249
perror("sigaction");
1844
1250
return EX_OSERR;
1845
1251
}
1846
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
1254
if(ret == -1){
1849
perror_plus("sigaction");
1255
perror("sigaction");
1850
1256
exitcode = EX_OSERR;
1851
1257
goto end;
1852
1258
}
1853
1259
}
1854
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
1261
if(ret == -1){
1856
perror_plus("sigaction");
1262
perror("sigaction");
1857
1263
return EX_OSERR;
1858
1264
}
1859
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
1267
if(ret == -1){
1862
perror_plus("sigaction");
1268
perror("sigaction");
1863
1269
exitcode = EX_OSERR;
1864
1270
goto end;
1865
1271
}
1866
1272
}
1867
1273
1868
1274
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1870
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
1277
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1874
1279
exitcode = EX_UNAVAILABLE;
1875
1280
goto end;
1876
1281
}
1883
1288
errno = 0;
1884
1289
ret = seteuid(0);
1885
1290
if(ret == -1){
1886
perror_plus("seteuid");
1291
perror("seteuid");
1887
1292
}
1888
1293
1889
1294
#ifdef __linux__
1893
1298
bool restore_loglevel = true;
1894
1299
if(ret == -1){
1895
1300
restore_loglevel = false;
1896
perror_plus("klogctl");
1301
perror("klogctl");
1897
1302
}
1898
1303
#endif /* __linux__ */
1899
1304
1900
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
1306
if(sd < 0){
1902
perror_plus("socket");
1307
perror("socket");
1903
1308
exitcode = EX_OSERR;
1904
1309
#ifdef __linux__
1905
1310
if(restore_loglevel){
1906
1311
ret = klogctl(7, NULL, 0);
1907
1312
if(ret == -1){
1908
perror_plus("klogctl");
1313
perror("klogctl");
1909
1314
}
1910
1315
}
1911
1316
#endif /* __linux__ */
1913
1318
errno = 0;
1914
1319
ret = seteuid(uid);
1915
1320
if(ret == -1){
1916
perror_plus("seteuid");
1321
perror("seteuid");
1917
1322
}
1918
1323
goto end;
1919
1324
}
1920
1325
strcpy(network.ifr_name, interface);
1921
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
1327
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1924
1329
#ifdef __linux__
1925
1330
if(restore_loglevel){
1926
1331
ret = klogctl(7, NULL, 0);
1927
1332
if(ret == -1){
1928
perror_plus("klogctl");
1333
perror("klogctl");
1929
1334
}
1930
1335
}
1931
1336
#endif /* __linux__ */
1934
1339
errno = 0;
1935
1340
ret = seteuid(uid);
1936
1341
if(ret == -1){
1937
perror_plus("seteuid");
1342
perror("seteuid");
1938
1343
}
1939
1344
goto end;
1940
1345
}
1944
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
1350
if(ret == -1){
1946
1351
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1948
1353
exitcode = EX_OSERR;
1949
1354
#ifdef __linux__
1950
1355
if(restore_loglevel){
1951
1356
ret = klogctl(7, NULL, 0);
1952
1357
if(ret == -1){
1953
perror_plus("klogctl");
1358
perror("klogctl");
1954
1359
}
1955
1360
}
1956
1361
#endif /* __linux__ */
1958
1363
errno = 0;
1959
1364
ret = seteuid(uid);
1960
1365
if(ret == -1){
1961
perror_plus("seteuid");
1366
perror("seteuid");
1962
1367
}
1963
1368
goto end;
1964
1369
}
1965
1370
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1968
1372
for(int i=0; i < delay * 4; i++){
1969
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
1374
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1972
1376
} else if(network.ifr_flags & IFF_RUNNING){
1973
1377
break;
1974
1378
}
1975
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
1380
ret = nanosleep(&sleeptime, NULL);
1977
1381
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1382
perror("nanosleep");
1979
1383
}
1980
1384
}
1981
1385
if(not take_down_interface){
1982
1386
/* We won't need the socket anymore */
1983
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
1388
if(ret == -1){
1985
perror_plus("close");
1389
perror("close");
1986
1390
}
1987
1391
}
1988
1392
#ifdef __linux__
1990
1394
/* Restores kernel loglevel to default */
1991
1395
ret = klogctl(7, NULL, 0);
1992
1396
if(ret == -1){
1993
perror_plus("klogctl");
1397
perror("klogctl");
1994
1398
}
1995
1399
}
1996
1400
#endif /* __linux__ */
2000
1404
/* Lower privileges */
2001
1405
ret = seteuid(uid);
2002
1406
if(ret == -1){
2003
perror_plus("seteuid");
1407
perror("seteuid");
2004
1408
}
2005
1409
} else {
2006
1410
/* Lower privileges permanently */
2007
1411
ret = setuid(uid);
2008
1412
if(ret == -1){
2009
perror_plus("setuid");
1413
perror("setuid");
2010
1414
}
2011
1415
}
2012
1416
}
2017
1421
2018
1422
ret = init_gnutls_global(pubkey, seckey);
2019
1423
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2022
1425
exitcode = EX_UNAVAILABLE;
2023
1426
goto end;
2024
1427
} else {
2029
1432
goto end;
2030
1433
}
2031
1434
1435
tempdir_created = true;
2032
1436
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2034
1439
goto end;
2035
1440
}
2036
tempdir_created = true;
2037
1441
2038
1442
if(quit_now){
2039
1443
goto end;
2040
1444
}
2041
1445
2042
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2045
1448
exitcode = EX_UNAVAILABLE;
2046
1449
goto end;
2047
1450
} else {
2057
1460
/* (Mainly meant for debugging) */
2058
1461
char *address = strrchr(connect_to, ':');
2059
1462
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2062
1464
exitcode = EX_USAGE;
2063
1465
goto end;
2064
1466
}
2072
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2073
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
1476
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
1477
fprintf(stderr, "Bad port number\n");
2077
1478
exitcode = EX_USAGE;
2078
1479
goto end;
2079
1480
}
2084
1485
2085
1486
port = (uint16_t)tmpmax;
2086
1487
*address = '\0';
1488
address = connect_to;
2087
1489
/* Colon in address indicates IPv6 */
2088
1490
int af;
2089
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2090
1492
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
1493
} else {
2098
1494
af = AF_INET;
2099
1495
}
2100
address = connect_to;
2101
1496
2102
1497
if(quit_now){
2103
1498
goto end;
2104
1499
}
2105
1500
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2119
1523
exitcode = EXIT_SUCCESS;
2120
1524
}
2121
2122
1525
goto end;
2123
1526
}
2124
1527
2146
1549
2147
1550
/* Check if creating the Avahi server object succeeded */
2148
1551
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2151
1553
avahi_strerror(error));
2152
1554
exitcode = EX_UNAVAILABLE;
2153
1555
goto end;
2162
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
1565
NULL, 0, browse_callback, NULL);
2164
1566
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2167
1568
avahi_strerror(avahi_server_errno(mc.server)));
2168
1569
exitcode = EX_UNAVAILABLE;
2169
1570
goto end;
2176
1577
/* Run the main loop */
2177
1578
2178
1579
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2190
1584
2191
1585
end:
2192
1586
2193
1587
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1589
}
2197
1590
2198
1591
/* Cleanup things */
2214
1607
if(gpgme_initialized){
2215
1608
gpgme_release(mc.ctx);
2216
1609
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
1610
2231
1611
/* Take down the network interface */
2232
1612
if(take_down_interface){
2234
1614
errno = 0;
2235
1615
ret = seteuid(0);
2236
1616
if(ret == -1){
2237
perror_plus("seteuid");
1617
perror("seteuid");
2238
1618
}
2239
1619
if(geteuid() == 0){
2240
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
1621
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2244
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
1626
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2248
1628
}
2249
1629
}
2250
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
1631
if(ret == -1){
2252
perror_plus("close");
1632
perror("close");
2253
1633
}
2254
1634
/* Lower privileges permanently */
2255
1635
errno = 0;
2256
1636
ret = setuid(uid);
2257
1637
if(ret == -1){
2258
perror_plus("setuid");
1638
perror("setuid");
2259
1639
}
2260
1640
}
2261
1641
}
2262
1642
2263
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2264
1644
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2272
1665
char *fullname = NULL;
2273
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
1667
direntry->d_name);
2275
1668
if(ret < 0){
2276
perror_plus("asprintf");
1669
perror("asprintf");
2277
1670
continue;
2278
1671
}
2279
1672
ret = remove(fullname);
2280
1673
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2283
1676
}
2284
1677
free(fullname);
2285
1678
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1679
closedir(d);
2292
1680
}
2293
1681
ret = rmdir(tempdir);
2294
1682
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
1683
perror("rmdir");
2296
1684
}
2297
1685
}
2298
1686
2303
1691
&old_sigterm_action,
2304
1692
NULL));
2305
1693
if(ret == -1){
2306
perror_plus("sigaction");
1694
perror("sigaction");
2307
1695
}
2308
1696
do {
2309
1697
ret = raise(signal_received);
2310
1698
} while(ret != 0 and errno == EINTR);
2311
1699
if(ret != 0){
2312
perror_plus("raise");
1700
perror("raise");
2313
1701
abort();
2314
1702
}
2315
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0