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- Committer: Teddy Hogeborn
- Date: 2010-03-27 18:50:53 UTC
- mfrom: (24.1.146 mandos)
- Revision ID: teddy@fukt.bsnet.se-20100327185053-ht5xs10afawgx0sq
Merge from Björn.
- 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() */
110
107
init_gnutls_session(),
111
108
GNUTLS_* */
112
109
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
115
112
116
113
/* GPGME */
117
114
#include <gpgme.h> /* All GPGME types, constants and
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,
180
153
* "buffer_length" is how much is already used.
181
154
*/
182
155
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
156
size_t buffer_capacity){
184
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
159
if(buffer == NULL){
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, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
167
/*
232
168
* Initialize GPGME.
233
169
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
236
172
gpgme_error_t rc;
237
173
gpgme_engine_info_t engine_info;
238
174
247
183
248
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
185
if(fd == -1){
250
perror_plus("open");
186
perror("open");
251
187
return false;
252
188
}
253
189
254
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
191
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
193
gpgme_strsource(rc), gpgme_strerror(rc));
259
194
return false;
260
195
}
261
196
262
197
rc = gpgme_op_import(mc.ctx, pgp_data);
263
198
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
200
gpgme_strsource(rc), gpgme_strerror(rc));
267
201
return false;
268
202
}
269
203
270
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
205
if(ret == -1){
272
perror_plus("close");
206
perror("close");
273
207
}
274
208
gpgme_data_release(pgp_data);
275
209
return true;
276
210
}
277
211
278
212
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
281
214
}
282
215
283
216
/* Init GPGME */
284
217
gpgme_check_version(NULL);
285
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
219
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
221
gpgme_strsource(rc), gpgme_strerror(rc));
290
222
return false;
291
223
}
292
224
293
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
294
226
rc = gpgme_get_engine_info(&engine_info);
295
227
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
229
gpgme_strsource(rc), gpgme_strerror(rc));
299
230
return false;
300
231
}
307
238
engine_info = engine_info->next;
308
239
}
309
240
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
242
return false;
313
243
}
314
244
315
245
/* Create new GPGME "context" */
316
246
rc = gpgme_new(&(mc.ctx));
317
247
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
321
250
return false;
322
251
}
323
252
342
271
ssize_t plaintext_length = 0;
343
272
344
273
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
275
}
348
276
349
277
/* Create new GPGME data buffer from memory cryptotext */
350
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
279
0);
352
280
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
282
gpgme_strsource(rc), gpgme_strerror(rc));
356
283
return -1;
357
284
}
359
286
/* Create new empty GPGME data buffer for the plaintext */
360
287
rc = gpgme_data_new(&dh_plain);
361
288
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
290
gpgme_strsource(rc), gpgme_strerror(rc));
365
291
gpgme_data_release(dh_crypto);
366
292
return -1;
370
296
data buffer */
371
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
298
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
300
gpgme_strsource(rc), gpgme_strerror(rc));
376
301
plaintext_length = -1;
377
302
if(debug){
378
303
gpgme_decrypt_result_t result;
379
304
result = gpgme_op_decrypt_result(mc.ctx);
380
305
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
307
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
308
fprintf(stderr, "Unsupported algorithm: %s\n",
386
309
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
310
fprintf(stderr, "Wrong key usage: %u\n",
389
311
result->wrong_key_usage);
390
312
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
393
314
}
394
315
gpgme_recipient_t recipient;
395
316
recipient = result->recipients;
396
317
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
318
fprintf(stderr, "Public key algorithm: %s\n",
399
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
404
322
recipient->status == GPG_ERR_NO_SECKEY
405
323
? "No" : "Yes");
406
324
recipient = recipient->next;
411
329
}
412
330
413
331
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
333
}
417
334
418
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
421
338
plaintext_length = -1;
422
339
goto decrypt_end;
423
340
}
425
342
*plaintext = NULL;
426
343
while(true){
427
344
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
430
347
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
434
351
}
435
352
436
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
358
break;
442
359
}
443
360
if(ret < 0){
444
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
445
362
plaintext_length = -1;
446
363
goto decrypt_end;
447
364
}
449
366
}
450
367
451
368
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
454
370
for(ssize_t i = 0; i < plaintext_length; i++){
455
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
372
}
478
394
/* GnuTLS log function callback */
479
395
static void debuggnutls(__attribute__((unused)) int level,
480
396
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
482
398
}
483
399
484
400
static int init_gnutls_global(const char *pubkeyfilename,
486
402
int ret;
487
403
488
404
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
491
406
}
492
407
493
408
ret = gnutls_global_init();
494
409
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
497
412
return -1;
498
413
}
499
414
506
421
}
507
422
508
423
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
510
425
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"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));
513
431
gnutls_global_deinit();
514
432
return -1;
515
433
}
516
434
517
435
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
438
seckeyfilename);
522
439
}
526
443
GNUTLS_OPENPGP_FMT_BASE64);
527
444
if(ret != GNUTLS_E_SUCCESS){
528
445
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
534
450
goto globalfail;
535
451
}
536
452
537
453
/* GnuTLS server initialization */
538
454
ret = gnutls_dh_params_init(&mc.dh_params);
539
455
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
457
" %s\n", safer_gnutls_strerror(ret));
543
458
goto globalfail;
544
459
}
545
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
461
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
463
safer_gnutls_strerror(ret));
550
464
goto globalfail;
551
465
}
572
486
}
573
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
488
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
490
safer_gnutls_strerror(ret));
578
491
}
579
492
587
500
}
588
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
502
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"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));
594
506
gnutls_deinit(*session);
595
507
return -1;
596
508
}
605
517
}
606
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
519
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
521
safer_gnutls_strerror(ret));
611
522
gnutls_deinit(*session);
612
523
return -1;
658
569
pf = PF_INET;
659
570
break;
660
571
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
663
573
errno = EINVAL;
664
574
return -1;
665
575
}
670
580
}
671
581
672
582
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
584
"\n", ip, port);
676
585
}
677
586
678
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
588
if(tcp_sd < 0){
680
589
int e = errno;
681
perror_plus("socket");
590
perror("socket");
682
591
errno = e;
683
592
goto mandos_end;
684
593
}
698
607
}
699
608
if(ret < 0 ){
700
609
int e = errno;
701
perror_plus("inet_pton");
610
perror("inet_pton");
702
611
errno = e;
703
612
goto mandos_end;
704
613
}
705
614
if(ret == 0){
706
615
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
709
617
errno = e;
710
618
goto mandos_end;
711
619
}
716
624
717
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
627
-Wunreachable-code*/
720
628
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
630
" without a network interface\n");
724
631
errno = EINVAL;
725
632
goto mandos_end;
742
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
650
char interface[IF_NAMESIZE];
744
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
652
perror("if_indextoname");
746
653
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
655
ip, interface, port);
750
656
}
751
657
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
754
660
}
755
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
669
sizeof(addrstr));
764
670
}
765
671
if(pcret == NULL){
766
perror_plus("inet_ntop");
672
perror("inet_ntop");
767
673
} else {
768
674
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
676
}
772
677
}
773
678
}
783
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
689
}
785
690
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
691
int e = errno;
692
perror("connect");
693
errno = e;
791
694
goto mandos_end;
792
695
}
793
696
801
704
while(true){
802
705
size_t out_size = strlen(out);
803
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
707
out_size - written));
805
708
if(ret == -1){
806
709
int e = errno;
807
perror_plus("write");
710
perror("write");
808
711
errno = e;
809
712
goto mandos_end;
810
713
}
827
730
}
828
731
829
732
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
832
734
}
833
735
834
736
if(quit_now){
836
738
goto mandos_end;
837
739
}
838
740
839
/* Spurious warning from -Wint-to-pointer-cast */
840
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
742
842
743
if(quit_now){
854
755
855
756
if(ret != GNUTLS_E_SUCCESS){
856
757
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
759
gnutls_perror(ret);
860
760
}
861
761
errno = EPROTO;
865
765
/* Read OpenPGP packet that contains the wanted password */
866
766
867
767
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
870
770
}
871
771
872
772
while(true){
877
777
}
878
778
879
779
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
780
buffer_capacity);
881
781
if(buffer_capacity == 0){
882
782
int e = errno;
883
perror_plus("incbuffer");
783
perror("incbuffer");
884
784
errno = e;
885
785
goto mandos_end;
886
786
}
910
810
}
911
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
812
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
814
gnutls_perror(ret);
916
815
errno = EPROTO;
917
816
goto mandos_end;
918
817
}
919
818
break;
920
819
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
820
fprintf(stderr, "Unknown error while reading data from"
923
821
" encrypted session with Mandos server\n");
924
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
823
errno = EIO;
931
829
}
932
830
933
831
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
936
833
}
937
834
938
835
if(quit_now){
950
847
951
848
if(buffer_length > 0){
952
849
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
954
852
&decrypted_buffer);
955
853
if(decrypted_buffer_size >= 0){
956
854
967
865
if(ret == 0 and ferror(stdout)){
968
866
int e = errno;
969
867
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
868
fprintf(stderr, "Error writing encrypted data: %s\n",
972
869
strerror(errno));
973
870
}
974
871
errno = e;
994
891
if(e == 0){
995
892
e = errno;
996
893
}
997
perror_plus("close");
894
perror("close");
998
895
}
999
896
gnutls_deinit(session);
1000
errno = e;
1001
897
if(quit_now){
1002
errno = EINTR;
898
e = EINTR;
1003
899
retval = -1;
1004
900
}
901
errno = e;
1005
902
}
1006
903
return retval;
1007
904
}
1032
929
switch(event){
1033
930
default:
1034
931
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
934
avahi_strerror(avahi_server_errno(mc.server)));
1039
935
break;
1043
939
char ip[AVAHI_ADDRESS_STR_MAX];
1044
940
avahi_address_snprint(ip, sizeof(ip), address);
1045
941
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
944
ip, (intmax_t)interface, port);
1050
945
}
1052
947
avahi_proto_to_af(proto));
1053
948
if(ret == 0){
1054
949
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1058
950
}
1059
951
}
1060
952
}
1084
976
default:
1085
977
case AVAHI_BROWSER_FAILURE:
1086
978
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
979
fprintf(stderr, "(Avahi browser) %s\n",
1089
980
avahi_strerror(avahi_server_errno(mc.server)));
1090
981
avahi_simple_poll_quit(mc.simple_poll);
1091
982
return;
1099
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
991
name, type, domain, protocol, 0,
1101
992
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1104
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1105
995
break;
1106
996
1110
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1002
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
1004
}
1116
1005
break;
1117
1006
}
1118
1007
}
1119
1008
1120
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1121
1010
static void handle_sigterm(int sig){
1122
1011
if(quit_now){
1123
1012
return;
1125
1014
quit_now = 1;
1126
1015
signal_received = sig;
1127
1016
int old_errno = errno;
1128
/* set main loop to exit */
1129
1017
if(mc.simple_poll != NULL){
1130
1018
avahi_simple_poll_quit(mc.simple_poll);
1131
1019
}
1132
1020
errno = old_errno;
1133
1021
}
1134
1022
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
1413
1023
int main(int argc, char *argv[]){
1414
1024
AvahiSServiceBrowser *sb = NULL;
1415
1025
int error;
1417
1027
intmax_t tmpmax;
1418
1028
char *tmp;
1419
1029
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1030
const char *interface = "eth0";
1421
1031
struct ifreq network;
1422
1032
int sd = -1;
1423
1033
bool take_down_interface = false;
1424
1034
uid_t uid;
1425
1035
gid_t gid;
1036
char *connect_to = NULL;
1426
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1427
1038
bool tempdir_created = false;
1428
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
1043
bool gnutls_initialized = false;
1433
1044
bool gpgme_initialized = false;
1434
1045
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
1437
1046
1438
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1439
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1445
1054
errno = 0;
1446
1055
ret = setgid(gid);
1447
1056
if(ret == -1){
1448
perror_plus("setgid");
1057
perror("setgid");
1449
1058
}
1450
1059
1451
1060
/* Lower user privileges (temporarily) */
1452
1061
errno = 0;
1453
1062
ret = seteuid(uid);
1454
1063
if(ret == -1){
1455
perror_plus("seteuid");
1064
perror("seteuid");
1456
1065
}
1457
1066
1458
1067
if(quit_now){
1493
1102
.arg = "SECONDS",
1494
1103
.doc = "Maximum delay to wait for interface startup",
1495
1104
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
1105
/*
1505
1106
* These reproduce what we would get without ARGP_NO_HELP
1506
1107
*/
1550
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1551
1152
argp_error(state, "Bad delay");
1552
1153
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
1154
break;
1565
1155
/*
1566
1156
* These reproduce what we would get without ARGP_NO_HELP
1573
1163
argp_state_help(state, state->out_stream,
1574
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
1165
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
1167
exit(argp_err_exit_status);
1579
1168
break;
1595
1184
case ENOMEM:
1596
1185
default:
1597
1186
errno = ret;
1598
perror_plus("argp_parse");
1187
perror("argp_parse");
1599
1188
exitcode = EX_OSERR;
1600
1189
goto end;
1601
1190
case EINVAL:
1603
1192
goto end;
1604
1193
}
1605
1194
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1763
}
1764
}
1765
1195
1766
1196
if(not debug){
1767
1197
avahi_set_log_function(empty_log);
1768
1198
}
1769
1199
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
1201
from the signal handler */
1806
1202
/* Initialize the pseudo-RNG for Avahi */
1807
1203
srand((unsigned int) time(NULL));
1808
1204
mc.simple_poll = avahi_simple_poll_new();
1809
1205
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1812
1207
exitcode = EX_UNAVAILABLE;
1813
1208
goto end;
1814
1209
}
1816
1211
sigemptyset(&sigterm_action.sa_mask);
1817
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1818
1213
if(ret == -1){
1819
perror_plus("sigaddset");
1214
perror("sigaddset");
1820
1215
exitcode = EX_OSERR;
1821
1216
goto end;
1822
1217
}
1823
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1824
1219
if(ret == -1){
1825
perror_plus("sigaddset");
1220
perror("sigaddset");
1826
1221
exitcode = EX_OSERR;
1827
1222
goto end;
1828
1223
}
1829
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1830
1225
if(ret == -1){
1831
perror_plus("sigaddset");
1226
perror("sigaddset");
1832
1227
exitcode = EX_OSERR;
1833
1228
goto end;
1834
1229
}
1838
1233
*/
1839
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1840
1235
if(ret == -1){
1841
perror_plus("sigaction");
1236
perror("sigaction");
1842
1237
return EX_OSERR;
1843
1238
}
1844
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1846
1241
if(ret == -1){
1847
perror_plus("sigaction");
1242
perror("sigaction");
1848
1243
exitcode = EX_OSERR;
1849
1244
goto end;
1850
1245
}
1851
1246
}
1852
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1853
1248
if(ret == -1){
1854
perror_plus("sigaction");
1249
perror("sigaction");
1855
1250
return EX_OSERR;
1856
1251
}
1857
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1858
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1859
1254
if(ret == -1){
1860
perror_plus("sigaction");
1255
perror("sigaction");
1861
1256
exitcode = EX_OSERR;
1862
1257
goto end;
1863
1258
}
1864
1259
}
1865
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1866
1261
if(ret == -1){
1867
perror_plus("sigaction");
1262
perror("sigaction");
1868
1263
return EX_OSERR;
1869
1264
}
1870
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1871
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1872
1267
if(ret == -1){
1873
perror_plus("sigaction");
1268
perror("sigaction");
1874
1269
exitcode = EX_OSERR;
1875
1270
goto end;
1876
1271
}
1877
1272
}
1878
1273
1879
1274
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1881
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
1277
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1885
1279
exitcode = EX_UNAVAILABLE;
1886
1280
goto end;
1887
1281
}
1894
1288
errno = 0;
1895
1289
ret = seteuid(0);
1896
1290
if(ret == -1){
1897
perror_plus("seteuid");
1291
perror("seteuid");
1898
1292
}
1899
1293
1900
1294
#ifdef __linux__
1904
1298
bool restore_loglevel = true;
1905
1299
if(ret == -1){
1906
1300
restore_loglevel = false;
1907
perror_plus("klogctl");
1301
perror("klogctl");
1908
1302
}
1909
1303
#endif /* __linux__ */
1910
1304
1911
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
1306
if(sd < 0){
1913
perror_plus("socket");
1307
perror("socket");
1914
1308
exitcode = EX_OSERR;
1915
1309
#ifdef __linux__
1916
1310
if(restore_loglevel){
1917
1311
ret = klogctl(7, NULL, 0);
1918
1312
if(ret == -1){
1919
perror_plus("klogctl");
1313
perror("klogctl");
1920
1314
}
1921
1315
}
1922
1316
#endif /* __linux__ */
1924
1318
errno = 0;
1925
1319
ret = seteuid(uid);
1926
1320
if(ret == -1){
1927
perror_plus("seteuid");
1321
perror("seteuid");
1928
1322
}
1929
1323
goto end;
1930
1324
}
1931
1325
strcpy(network.ifr_name, interface);
1932
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
1327
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1935
1329
#ifdef __linux__
1936
1330
if(restore_loglevel){
1937
1331
ret = klogctl(7, NULL, 0);
1938
1332
if(ret == -1){
1939
perror_plus("klogctl");
1333
perror("klogctl");
1940
1334
}
1941
1335
}
1942
1336
#endif /* __linux__ */
1945
1339
errno = 0;
1946
1340
ret = seteuid(uid);
1947
1341
if(ret == -1){
1948
perror_plus("seteuid");
1342
perror("seteuid");
1949
1343
}
1950
1344
goto end;
1951
1345
}
1955
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
1350
if(ret == -1){
1957
1351
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1959
1353
exitcode = EX_OSERR;
1960
1354
#ifdef __linux__
1961
1355
if(restore_loglevel){
1962
1356
ret = klogctl(7, NULL, 0);
1963
1357
if(ret == -1){
1964
perror_plus("klogctl");
1358
perror("klogctl");
1965
1359
}
1966
1360
}
1967
1361
#endif /* __linux__ */
1969
1363
errno = 0;
1970
1364
ret = seteuid(uid);
1971
1365
if(ret == -1){
1972
perror_plus("seteuid");
1366
perror("seteuid");
1973
1367
}
1974
1368
goto end;
1975
1369
}
1976
1370
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1979
1372
for(int i=0; i < delay * 4; i++){
1980
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
1374
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1983
1376
} else if(network.ifr_flags & IFF_RUNNING){
1984
1377
break;
1985
1378
}
1986
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
1380
ret = nanosleep(&sleeptime, NULL);
1988
1381
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1382
perror("nanosleep");
1990
1383
}
1991
1384
}
1992
1385
if(not take_down_interface){
1993
1386
/* We won't need the socket anymore */
1994
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
1388
if(ret == -1){
1996
perror_plus("close");
1389
perror("close");
1997
1390
}
1998
1391
}
1999
1392
#ifdef __linux__
2001
1394
/* Restores kernel loglevel to default */
2002
1395
ret = klogctl(7, NULL, 0);
2003
1396
if(ret == -1){
2004
perror_plus("klogctl");
1397
perror("klogctl");
2005
1398
}
2006
1399
}
2007
1400
#endif /* __linux__ */
2011
1404
/* Lower privileges */
2012
1405
ret = seteuid(uid);
2013
1406
if(ret == -1){
2014
perror_plus("seteuid");
1407
perror("seteuid");
2015
1408
}
2016
1409
} else {
2017
1410
/* Lower privileges permanently */
2018
1411
ret = setuid(uid);
2019
1412
if(ret == -1){
2020
perror_plus("setuid");
1413
perror("setuid");
2021
1414
}
2022
1415
}
2023
1416
}
2028
1421
2029
1422
ret = init_gnutls_global(pubkey, seckey);
2030
1423
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2033
1425
exitcode = EX_UNAVAILABLE;
2034
1426
goto end;
2035
1427
} else {
2040
1432
goto end;
2041
1433
}
2042
1434
1435
tempdir_created = true;
2043
1436
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2045
1439
goto end;
2046
1440
}
2047
tempdir_created = true;
2048
1441
2049
1442
if(quit_now){
2050
1443
goto end;
2051
1444
}
2052
1445
2053
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2056
1448
exitcode = EX_UNAVAILABLE;
2057
1449
goto end;
2058
1450
} else {
2068
1460
/* (Mainly meant for debugging) */
2069
1461
char *address = strrchr(connect_to, ':');
2070
1462
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2073
1464
exitcode = EX_USAGE;
2074
1465
goto end;
2075
1466
}
2083
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2084
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
1476
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
1477
fprintf(stderr, "Bad port number\n");
2088
1478
exitcode = EX_USAGE;
2089
1479
goto end;
2090
1480
}
2095
1485
2096
1486
port = (uint16_t)tmpmax;
2097
1487
*address = '\0';
1488
address = connect_to;
2098
1489
/* Colon in address indicates IPv6 */
2099
1490
int af;
2100
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2101
1492
af = AF_INET6;
2102
/* Accept [] around IPv6 address - see RFC 5952 */
2103
if(connect_to[0] == '[' and address[-1] == ']')
2104
{
2105
connect_to++;
2106
address[-1] = '\0';
2107
}
2108
1493
} else {
2109
1494
af = AF_INET;
2110
1495
}
2111
address = connect_to;
2112
1496
2113
1497
if(quit_now){
2114
1498
goto end;
2115
1499
}
2116
1500
2117
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2119
if(quit_now or ret == 0){
2120
break;
2121
}
2122
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2125
}
2126
sleep((int)retry_interval);
2127
}
2128
2129
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 {
2130
1523
exitcode = EXIT_SUCCESS;
2131
1524
}
2132
2133
1525
goto end;
2134
1526
}
2135
1527
2157
1549
2158
1550
/* Check if creating the Avahi server object succeeded */
2159
1551
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2162
1553
avahi_strerror(error));
2163
1554
exitcode = EX_UNAVAILABLE;
2164
1555
goto end;
2173
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
1565
NULL, 0, browse_callback, NULL);
2175
1566
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2178
1568
avahi_strerror(avahi_server_errno(mc.server)));
2179
1569
exitcode = EX_UNAVAILABLE;
2180
1570
goto end;
2187
1577
/* Run the main loop */
2188
1578
2189
1579
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2192
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2196
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2200
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2201
1584
2202
1585
end:
2203
1586
2204
1587
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2207
1589
}
2208
1590
2209
1591
/* Cleanup things */
2225
1607
if(gpgme_initialized){
2226
1608
gpgme_release(mc.ctx);
2227
1609
}
2228
2229
/* Cleans up the circular linked list of Mandos servers the client
2230
has seen */
2231
if(mc.current_server != NULL){
2232
mc.current_server->prev->next = NULL;
2233
while(mc.current_server != NULL){
2234
server *next = mc.current_server->next;
2235
free(mc.current_server);
2236
mc.current_server = next;
2237
}
2238
}
2239
2240
/* XXX run network hooks "stop" here */
2241
1610
2242
1611
/* Take down the network interface */
2243
1612
if(take_down_interface){
2245
1614
errno = 0;
2246
1615
ret = seteuid(0);
2247
1616
if(ret == -1){
2248
perror_plus("seteuid");
1617
perror("seteuid");
2249
1618
}
2250
1619
if(geteuid() == 0){
2251
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
1621
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2255
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
1626
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2259
1628
}
2260
1629
}
2261
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
1631
if(ret == -1){
2263
perror_plus("close");
1632
perror("close");
2264
1633
}
2265
1634
/* Lower privileges permanently */
2266
1635
errno = 0;
2267
1636
ret = setuid(uid);
2268
1637
if(ret == -1){
2269
perror_plus("setuid");
1638
perror("setuid");
2270
1639
}
2271
1640
}
2272
1641
}
2273
1642
2274
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2275
1644
if(tempdir_created){
2276
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
alphasort);
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
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
}
2283
1665
char *fullname = NULL;
2284
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2285
1667
direntry->d_name);
2286
1668
if(ret < 0){
2287
perror_plus("asprintf");
1669
perror("asprintf");
2288
1670
continue;
2289
1671
}
2290
1672
ret = remove(fullname);
2291
1673
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2294
1676
}
2295
1677
free(fullname);
2296
1678
}
2297
}
2298
2299
/* need to clean even if 0 because man page doesn't specify */
2300
free(direntries);
2301
if (numentries == -1){
2302
perror_plus("scandir");
1679
closedir(d);
2303
1680
}
2304
1681
ret = rmdir(tempdir);
2305
1682
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");
1683
perror("rmdir");
2307
1684
}
2308
1685
}
2309
1686
2314
1691
&old_sigterm_action,
2315
1692
NULL));
2316
1693
if(ret == -1){
2317
perror_plus("sigaction");
1694
perror("sigaction");
2318
1695
}
2319
1696
do {
2320
1697
ret = raise(signal_received);
2321
1698
} while(ret != 0 and errno == EINTR);
2322
1699
if(ret != 0){
2323
perror_plus("raise");
1700
perror("raise");
2324
1701
abort();
2325
1702
}
2326
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0