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- Committer: Björn Påhlsson
- Date: 2011-11-14 18:32:54 UTC
- mfrom: (505.3.7 client-network-hooks)
- mto: (505.3.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@fukt.bsnet.se-20111114183254-ujkmu680jli1w3yd
merge
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
87
90
88
91
#ifdef __linux__
89
92
#include <sys/klog.h> /* klogctl() */
107
110
init_gnutls_session(),
108
111
GNUTLS_* */
109
112
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
112
115
113
116
/* GPGME */
114
117
#include <gpgme.h> /* All GPGME types, constants and
122
125
#define PATHDIR "/conf/conf.d/mandos"
123
126
#define SECKEY "seckey.txt"
124
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
129
126
130
bool debug = false;
127
131
static const char mandos_protocol_version[] = "1";
128
132
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
130
148
131
149
/* Used for passing in values through the Avahi callback functions */
132
150
typedef struct {
137
155
gnutls_dh_params_t dh_params;
138
156
const char *priority;
139
157
gpgme_ctx_t ctx;
158
server *current_server;
140
159
} mandos_context;
141
160
142
161
/* global context so signal handler can reach it*/
143
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
163
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
146
166
147
167
sig_atomic_t quit_now = 0;
148
168
int signal_received = 0;
149
169
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
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
184
150
185
/*
151
186
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
187
* bytes. "buffer_capacity" is how much is currently allocated,
153
188
* "buffer_length" is how much is already used.
154
189
*/
155
190
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
191
size_t buffer_capacity){
157
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
194
if(buffer == NULL){
164
199
return buffer_capacity;
165
200
}
166
201
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
167
239
/*
168
240
* Initialize GPGME.
169
241
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
172
244
gpgme_error_t rc;
173
245
gpgme_engine_info_t engine_info;
174
246
183
255
184
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
257
if(fd == -1){
186
perror("open");
258
perror_plus("open");
187
259
return false;
188
260
}
189
261
190
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
263
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
193
266
gpgme_strsource(rc), gpgme_strerror(rc));
194
267
return false;
195
268
}
196
269
197
270
rc = gpgme_op_import(mc.ctx, pgp_data);
198
271
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
200
274
gpgme_strsource(rc), gpgme_strerror(rc));
201
275
return false;
202
276
}
203
277
204
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
279
if(ret == -1){
206
perror("close");
280
perror_plus("close");
207
281
}
208
282
gpgme_data_release(pgp_data);
209
283
return true;
210
284
}
211
285
212
286
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
214
289
}
215
290
216
291
/* Init GPGME */
217
292
gpgme_check_version(NULL);
218
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
294
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
221
297
gpgme_strsource(rc), gpgme_strerror(rc));
222
298
return false;
223
299
}
224
300
225
/* Set GPGME home directory for the OpenPGP engine only */
301
/* Set GPGME home directory for the OpenPGP engine only */
226
302
rc = gpgme_get_engine_info(&engine_info);
227
303
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
229
306
gpgme_strsource(rc), gpgme_strerror(rc));
230
307
return false;
231
308
}
238
315
engine_info = engine_info->next;
239
316
}
240
317
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
242
320
return false;
243
321
}
244
322
245
323
/* Create new GPGME "context" */
246
324
rc = gpgme_new(&(mc.ctx));
247
325
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
250
329
return false;
251
330
}
252
331
271
350
ssize_t plaintext_length = 0;
272
351
273
352
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
275
355
}
276
356
277
357
/* Create new GPGME data buffer from memory cryptotext */
278
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
359
0);
280
360
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
282
363
gpgme_strsource(rc), gpgme_strerror(rc));
283
364
return -1;
284
365
}
286
367
/* Create new empty GPGME data buffer for the plaintext */
287
368
rc = gpgme_data_new(&dh_plain);
288
369
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
290
372
gpgme_strsource(rc), gpgme_strerror(rc));
291
373
gpgme_data_release(dh_crypto);
292
374
return -1;
296
378
data buffer */
297
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
380
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
300
383
gpgme_strsource(rc), gpgme_strerror(rc));
301
384
plaintext_length = -1;
302
385
if(debug){
303
386
gpgme_decrypt_result_t result;
304
387
result = gpgme_op_decrypt_result(mc.ctx);
305
388
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
307
391
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
309
394
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
311
397
result->wrong_key_usage);
312
398
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
314
401
}
315
402
gpgme_recipient_t recipient;
316
403
recipient = result->recipients;
317
404
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
319
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
322
412
recipient->status == GPG_ERR_NO_SECKEY
323
413
? "No" : "Yes");
324
414
recipient = recipient->next;
329
419
}
330
420
331
421
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
333
424
}
334
425
335
426
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
427
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
428
perror_plus("gpgme_data_seek");
338
429
plaintext_length = -1;
339
430
goto decrypt_end;
340
431
}
342
433
*plaintext = NULL;
343
434
while(true){
344
435
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
436
(size_t)plaintext_length,
437
plaintext_capacity);
347
438
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
439
perror_plus("incbuffer");
440
plaintext_length = -1;
441
goto decrypt_end;
351
442
}
352
443
353
444
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
449
break;
359
450
}
360
451
if(ret < 0){
361
perror("gpgme_data_read");
452
perror_plus("gpgme_data_read");
362
453
plaintext_length = -1;
363
454
goto decrypt_end;
364
455
}
366
457
}
367
458
368
459
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
370
462
for(ssize_t i = 0; i < plaintext_length; i++){
371
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
464
}
394
486
/* GnuTLS log function callback */
395
487
static void debuggnutls(__attribute__((unused)) int level,
396
488
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
398
490
}
399
491
400
492
static int init_gnutls_global(const char *pubkeyfilename,
402
494
int ret;
403
495
404
496
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
406
499
}
407
500
408
501
ret = gnutls_global_init();
409
502
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
412
505
return -1;
413
506
}
414
507
421
514
}
422
515
423
516
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
425
518
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
431
521
gnutls_global_deinit();
432
522
return -1;
433
523
}
434
524
435
525
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
437
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
529
seckeyfilename);
439
530
}
443
534
GNUTLS_OPENPGP_FMT_BASE64);
444
535
if(ret != GNUTLS_E_SUCCESS){
445
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
446
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
450
542
goto globalfail;
451
543
}
452
544
453
545
/* GnuTLS server initialization */
454
546
ret = gnutls_dh_params_init(&mc.dh_params);
455
547
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
457
550
" %s\n", safer_gnutls_strerror(ret));
458
551
goto globalfail;
459
552
}
460
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
554
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
463
557
safer_gnutls_strerror(ret));
464
558
goto globalfail;
465
559
}
486
580
}
487
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
582
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
490
585
safer_gnutls_strerror(ret));
491
586
}
492
587
500
595
}
501
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
597
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
506
602
gnutls_deinit(*session);
507
603
return -1;
508
604
}
517
613
}
518
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
615
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
521
618
safer_gnutls_strerror(ret));
522
619
gnutls_deinit(*session);
523
620
return -1;
569
666
pf = PF_INET;
570
667
break;
571
668
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
573
671
errno = EINVAL;
574
672
return -1;
575
673
}
580
678
}
581
679
582
680
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
584
683
"\n", ip, port);
585
684
}
586
685
587
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
687
if(tcp_sd < 0){
589
688
int e = errno;
590
perror("socket");
689
perror_plus("socket");
591
690
errno = e;
592
691
goto mandos_end;
593
692
}
607
706
}
608
707
if(ret < 0 ){
609
708
int e = errno;
610
perror("inet_pton");
709
perror_plus("inet_pton");
611
710
errno = e;
612
711
goto mandos_end;
613
712
}
614
713
if(ret == 0){
615
714
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
617
717
errno = e;
618
718
goto mandos_end;
619
719
}
624
724
625
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
727
-Wunreachable-code*/
628
728
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
630
731
" without a network interface\n");
631
732
errno = EINVAL;
632
733
goto mandos_end;
649
750
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
751
char interface[IF_NAMESIZE];
651
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
753
perror_plus("if_indextoname");
653
754
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
655
757
ip, interface, port);
656
758
}
657
759
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
660
762
}
661
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
771
sizeof(addrstr));
670
772
}
671
773
if(pcret == NULL){
672
perror("inet_ntop");
774
perror_plus("inet_ntop");
673
775
} else {
674
776
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
676
779
}
677
780
}
678
781
}
688
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
792
}
690
793
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
694
799
goto mandos_end;
695
800
}
696
801
704
809
while(true){
705
810
size_t out_size = strlen(out);
706
811
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
812
out_size - written));
708
813
if(ret == -1){
709
814
int e = errno;
710
perror("write");
815
perror_plus("write");
711
816
errno = e;
712
817
goto mandos_end;
713
818
}
730
835
}
731
836
732
837
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
734
840
}
735
841
736
842
if(quit_now){
738
844
goto mandos_end;
739
845
}
740
846
847
/* Spurious warning from -Wint-to-pointer-cast */
741
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
849
743
850
if(quit_now){
755
862
756
863
if(ret != GNUTLS_E_SUCCESS){
757
864
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
759
867
gnutls_perror(ret);
760
868
}
761
869
errno = EPROTO;
765
873
/* Read OpenPGP packet that contains the wanted password */
766
874
767
875
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
770
878
}
771
879
772
880
while(true){
777
885
}
778
886
779
887
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
888
buffer_capacity);
781
889
if(buffer_capacity == 0){
782
890
int e = errno;
783
perror("incbuffer");
891
perror_plus("incbuffer");
784
892
errno = e;
785
893
goto mandos_end;
786
894
}
810
918
}
811
919
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
920
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
814
923
gnutls_perror(ret);
815
924
errno = EPROTO;
816
925
goto mandos_end;
817
926
}
818
927
break;
819
928
default:
820
fprintf(stderr, "Unknown error while reading data from"
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
821
931
" encrypted session with Mandos server\n");
822
932
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
933
errno = EIO;
829
939
}
830
940
831
941
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
833
944
}
834
945
835
946
if(quit_now){
847
958
848
959
if(buffer_length > 0){
849
960
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
852
962
&decrypted_buffer);
853
963
if(decrypted_buffer_size >= 0){
854
964
865
975
if(ret == 0 and ferror(stdout)){
866
976
int e = errno;
867
977
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
869
980
strerror(errno));
870
981
}
871
982
errno = e;
891
1002
if(e == 0){
892
1003
e = errno;
893
1004
}
894
perror("close");
1005
perror_plus("close");
895
1006
}
896
1007
gnutls_deinit(session);
1008
errno = e;
897
1009
if(quit_now){
898
e = EINTR;
1010
errno = EINTR;
899
1011
retval = -1;
900
1012
}
901
errno = e;
902
1013
}
903
1014
return retval;
904
1015
}
929
1040
switch(event){
930
1041
default:
931
1042
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
933
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
1046
avahi_strerror(avahi_server_errno(mc.server)));
935
1047
break;
939
1051
char ip[AVAHI_ADDRESS_STR_MAX];
940
1052
avahi_address_snprint(ip, sizeof(ip), address);
941
1053
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
943
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
1057
ip, (intmax_t)interface, port);
945
1058
}
947
1060
avahi_proto_to_af(proto));
948
1061
if(ret == 0){
949
1062
avahi_simple_poll_quit(mc.simple_poll);
1063
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
950
1066
}
951
1067
}
952
1068
}
976
1092
default:
977
1093
case AVAHI_BROWSER_FAILURE:
978
1094
979
fprintf(stderr, "(Avahi browser) %s\n",
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
980
1097
avahi_strerror(avahi_server_errno(mc.server)));
981
1098
avahi_simple_poll_quit(mc.simple_poll);
982
1099
return;
990
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
1108
name, type, domain, protocol, 0,
992
1109
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
994
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
995
1113
break;
996
1114
1000
1118
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1119
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1120
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1004
1123
}
1005
1124
break;
1006
1125
}
1007
1126
}
1008
1127
1009
/* stop main loop after sigterm has been called */
1128
/* Signal handler that stops main loop after SIGTERM */
1010
1129
static void handle_sigterm(int sig){
1011
1130
if(quit_now){
1012
1131
return;
1014
1133
quit_now = 1;
1015
1134
signal_received = sig;
1016
1135
int old_errno = errno;
1136
/* set main loop to exit */
1017
1137
if(mc.simple_poll != NULL){
1018
1138
avahi_simple_poll_quit(mc.simple_poll);
1019
1139
}
1020
1140
errno = old_errno;
1021
1141
}
1022
1142
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
int ret;
1145
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
if(s < 0){
1148
perror_plus("socket");
1149
return false;
1150
}
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
if(ret == -1){
1154
if(debug){
1155
perror_plus("ioctl SIOCGIFFLAGS");
1156
}
1157
return false;
1158
}
1159
return true;
1160
}
1161
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1169
}
1170
return false;
1171
}
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1177
}
1178
return true;
1179
}
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1193
}
1194
return false;
1195
}
1196
1197
/* Accept this device */
1198
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1201
}
1202
return true;
1203
}
1204
1205
/*
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1209
*/
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1212
return 0;
1213
}
1214
1215
struct ifreq ifr;
1216
if(not get_flags(if_entry->d_name, &ifr)){
1217
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1283
return 0;
1284
}
1285
return 1;
1286
}
1287
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1290
int ret;
1291
size_t sret;
1292
struct stat st;
1293
1294
if((direntry->d_name)[0] == '\0'){
1295
/* Empty name? */
1296
return 0;
1297
}
1298
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1301
"0123456789"
1302
"_-");
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1305
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1321
if(ret == -1){
1322
if(debug){
1323
perror_plus("Could not stat hook");
1324
}
1325
return 0;
1326
}
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1329
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1333
}
1334
return 0;
1335
}
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1338
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
return 1;
1346
}
1347
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1349
int ret;
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1353
1354
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1359
}
1360
ret = avahi_simple_poll_iterate(s, -1);
1361
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1366
}
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1389
}
1390
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1396
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1398
return 0;
1399
}
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1409
}
1410
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
}
1413
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1416
}
1417
}
1418
}
1419
}
1420
1023
1421
int main(int argc, char *argv[]){
1024
1422
AvahiSServiceBrowser *sb = NULL;
1025
1423
int error;
1027
1425
intmax_t tmpmax;
1028
1426
char *tmp;
1029
1427
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1428
const char *interface = "";
1031
1429
struct ifreq network;
1032
1430
int sd = -1;
1033
1431
bool take_down_interface = false;
1034
1432
uid_t uid;
1035
1433
gid_t gid;
1036
char *connect_to = NULL;
1037
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1435
bool tempdir_created = false;
1039
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1043
1440
bool gnutls_initialized = false;
1044
1441
bool gpgme_initialized = false;
1045
1442
float delay = 2.5f;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1046
1445
1047
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1447
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1453
errno = 0;
1055
1454
ret = setgid(gid);
1056
1455
if(ret == -1){
1057
perror("setgid");
1456
perror_plus("setgid");
1058
1457
}
1059
1458
1060
1459
/* Lower user privileges (temporarily) */
1061
1460
errno = 0;
1062
1461
ret = seteuid(uid);
1063
1462
if(ret == -1){
1064
perror("seteuid");
1463
perror_plus("seteuid");
1065
1464
}
1066
1465
1067
1466
if(quit_now){
1102
1501
.arg = "SECONDS",
1103
1502
.doc = "Maximum delay to wait for interface startup",
1104
1503
.group = 2 },
1504
{ .name = "retry", .key = 132,
1505
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1507
.group = 2 },
1508
{ .name = "network-hook-dir", .key = 133,
1509
.arg = "DIR",
1510
.doc = "Directory where network hooks are located",
1511
.group = 2 },
1105
1512
/*
1106
1513
* These reproduce what we would get without ARGP_NO_HELP
1107
1514
*/
1151
1558
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1559
argp_error(state, "Bad delay");
1153
1560
}
1561
case 132: /* --retry */
1562
errno = 0;
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1568
}
1569
break;
1570
case 133: /* --network-hook-dir */
1571
hookdir = arg;
1154
1572
break;
1155
1573
/*
1156
1574
* These reproduce what we would get without ARGP_NO_HELP
1163
1581
argp_state_help(state, state->out_stream,
1164
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1166
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
1586
exit(argp_err_exit_status);
1168
1587
break;
1184
1603
case ENOMEM:
1185
1604
default:
1186
1605
errno = ret;
1187
perror("argp_parse");
1606
perror_plus("argp_parse");
1188
1607
exitcode = EX_OSERR;
1189
1608
goto end;
1190
1609
case EINVAL:
1192
1611
goto end;
1193
1612
}
1194
1613
}
1614
1615
{
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
1683
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
1772
}
1195
1773
1196
1774
if(not debug){
1197
1775
avahi_set_log_function(empty_log);
1198
1776
}
1199
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1200
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1813
from the signal handler */
1202
1814
/* Initialize the pseudo-RNG for Avahi */
1203
1815
srand((unsigned int) time(NULL));
1204
1816
mc.simple_poll = avahi_simple_poll_new();
1205
1817
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1207
1820
exitcode = EX_UNAVAILABLE;
1208
1821
goto end;
1209
1822
}
1211
1824
sigemptyset(&sigterm_action.sa_mask);
1212
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
1826
if(ret == -1){
1214
perror("sigaddset");
1827
perror_plus("sigaddset");
1215
1828
exitcode = EX_OSERR;
1216
1829
goto end;
1217
1830
}
1218
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
1832
if(ret == -1){
1220
perror("sigaddset");
1833
perror_plus("sigaddset");
1221
1834
exitcode = EX_OSERR;
1222
1835
goto end;
1223
1836
}
1224
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
1838
if(ret == -1){
1226
perror("sigaddset");
1839
perror_plus("sigaddset");
1227
1840
exitcode = EX_OSERR;
1228
1841
goto end;
1229
1842
}
1233
1846
*/
1234
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
1848
if(ret == -1){
1236
perror("sigaction");
1849
perror_plus("sigaction");
1237
1850
return EX_OSERR;
1238
1851
}
1239
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
1854
if(ret == -1){
1242
perror("sigaction");
1855
perror_plus("sigaction");
1243
1856
exitcode = EX_OSERR;
1244
1857
goto end;
1245
1858
}
1246
1859
}
1247
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
1861
if(ret == -1){
1249
perror("sigaction");
1862
perror_plus("sigaction");
1250
1863
return EX_OSERR;
1251
1864
}
1252
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
1867
if(ret == -1){
1255
perror("sigaction");
1868
perror_plus("sigaction");
1256
1869
exitcode = EX_OSERR;
1257
1870
goto end;
1258
1871
}
1259
1872
}
1260
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
1874
if(ret == -1){
1262
perror("sigaction");
1875
perror_plus("sigaction");
1263
1876
return EX_OSERR;
1264
1877
}
1265
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
1880
if(ret == -1){
1268
perror("sigaction");
1881
perror_plus("sigaction");
1269
1882
exitcode = EX_OSERR;
1270
1883
goto end;
1271
1884
}
1272
1885
}
1273
1886
1274
1887
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1888
if(strcmp(interface, "none") != 0){
1276
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1890
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1279
1893
exitcode = EX_UNAVAILABLE;
1280
1894
goto end;
1281
1895
}
1288
1902
errno = 0;
1289
1903
ret = seteuid(0);
1290
1904
if(ret == -1){
1291
perror("seteuid");
1905
perror_plus("seteuid");
1292
1906
}
1293
1907
1294
1908
#ifdef __linux__
1298
1912
bool restore_loglevel = true;
1299
1913
if(ret == -1){
1300
1914
restore_loglevel = false;
1301
perror("klogctl");
1915
perror_plus("klogctl");
1302
1916
}
1303
1917
#endif /* __linux__ */
1304
1918
1305
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
1920
if(sd < 0){
1307
perror("socket");
1921
perror_plus("socket");
1308
1922
exitcode = EX_OSERR;
1309
1923
#ifdef __linux__
1310
1924
if(restore_loglevel){
1311
1925
ret = klogctl(7, NULL, 0);
1312
1926
if(ret == -1){
1313
perror("klogctl");
1927
perror_plus("klogctl");
1314
1928
}
1315
1929
}
1316
1930
#endif /* __linux__ */
1318
1932
errno = 0;
1319
1933
ret = seteuid(uid);
1320
1934
if(ret == -1){
1321
perror("seteuid");
1935
perror_plus("seteuid");
1322
1936
}
1323
1937
goto end;
1324
1938
}
1325
1939
strcpy(network.ifr_name, interface);
1326
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
1941
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1942
perror_plus("ioctl SIOCGIFFLAGS");
1329
1943
#ifdef __linux__
1330
1944
if(restore_loglevel){
1331
1945
ret = klogctl(7, NULL, 0);
1332
1946
if(ret == -1){
1333
perror("klogctl");
1947
perror_plus("klogctl");
1334
1948
}
1335
1949
}
1336
1950
#endif /* __linux__ */
1339
1953
errno = 0;
1340
1954
ret = seteuid(uid);
1341
1955
if(ret == -1){
1342
perror("seteuid");
1956
perror_plus("seteuid");
1343
1957
}
1344
1958
goto end;
1345
1959
}
1349
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1964
if(ret == -1){
1351
1965
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1353
1967
exitcode = EX_OSERR;
1354
1968
#ifdef __linux__
1355
1969
if(restore_loglevel){
1356
1970
ret = klogctl(7, NULL, 0);
1357
1971
if(ret == -1){
1358
perror("klogctl");
1972
perror_plus("klogctl");
1359
1973
}
1360
1974
}
1361
1975
#endif /* __linux__ */
1363
1977
errno = 0;
1364
1978
ret = seteuid(uid);
1365
1979
if(ret == -1){
1366
perror("seteuid");
1980
perror_plus("seteuid");
1367
1981
}
1368
1982
goto end;
1369
1983
}
1370
1984
}
1371
/* sleep checking until interface is running */
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1372
1987
for(int i=0; i < delay * 4; i++){
1373
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
1989
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1990
perror_plus("ioctl SIOCGIFFLAGS");
1376
1991
} else if(network.ifr_flags & IFF_RUNNING){
1377
1992
break;
1378
1993
}
1379
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
1995
ret = nanosleep(&sleeptime, NULL);
1381
1996
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1997
perror_plus("nanosleep");
1383
1998
}
1384
1999
}
1385
2000
if(not take_down_interface){
1386
2001
/* We won't need the socket anymore */
1387
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
2003
if(ret == -1){
1389
perror("close");
2004
perror_plus("close");
1390
2005
}
1391
2006
}
1392
2007
#ifdef __linux__
1394
2009
/* Restores kernel loglevel to default */
1395
2010
ret = klogctl(7, NULL, 0);
1396
2011
if(ret == -1){
1397
perror("klogctl");
2012
perror_plus("klogctl");
1398
2013
}
1399
2014
}
1400
2015
#endif /* __linux__ */
1404
2019
/* Lower privileges */
1405
2020
ret = seteuid(uid);
1406
2021
if(ret == -1){
1407
perror("seteuid");
2022
perror_plus("seteuid");
1408
2023
}
1409
2024
} else {
1410
2025
/* Lower privileges permanently */
1411
2026
ret = setuid(uid);
1412
2027
if(ret == -1){
1413
perror("setuid");
2028
perror_plus("setuid");
1414
2029
}
1415
2030
}
1416
2031
}
1421
2036
1422
2037
ret = init_gnutls_global(pubkey, seckey);
1423
2038
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
1425
2041
exitcode = EX_UNAVAILABLE;
1426
2042
goto end;
1427
2043
} else {
1432
2048
goto end;
1433
2049
}
1434
2050
2051
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
2053
goto end;
2054
}
1435
2055
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2056
1442
2057
if(quit_now){
1443
2058
goto end;
1444
2059
}
1445
2060
1446
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
1448
2064
exitcode = EX_UNAVAILABLE;
1449
2065
goto end;
1450
2066
} else {
1460
2076
/* (Mainly meant for debugging) */
1461
2077
char *address = strrchr(connect_to, ':');
1462
2078
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
1464
2081
exitcode = EX_USAGE;
1465
2082
goto end;
1466
2083
}
1474
2091
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2092
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
2093
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
1478
2096
exitcode = EX_USAGE;
1479
2097
goto end;
1480
2098
}
1485
2103
1486
2104
port = (uint16_t)tmpmax;
1487
2105
*address = '\0';
1488
address = connect_to;
1489
2106
/* Colon in address indicates IPv6 */
1490
2107
int af;
1491
if(strchr(address, ':') != NULL){
2108
if(strchr(connect_to, ':') != NULL){
1492
2109
af = AF_INET6;
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2112
{
2113
connect_to++;
2114
address[-1] = '\0';
2115
}
1493
2116
} else {
1494
2117
af = AF_INET;
1495
2118
}
2119
address = connect_to;
1496
2120
1497
2121
if(quit_now){
1498
2122
goto end;
1499
2123
}
1500
2124
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 {
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2128
break;
2129
}
2130
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2133
}
2134
sleep((int)retry_interval);
2135
}
2136
2137
if (not quit_now){
1523
2138
exitcode = EXIT_SUCCESS;
1524
2139
}
2140
1525
2141
goto end;
1526
2142
}
1527
2143
1549
2165
1550
2166
/* Check if creating the Avahi server object succeeded */
1551
2167
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
1553
2170
avahi_strerror(error));
1554
2171
exitcode = EX_UNAVAILABLE;
1555
2172
goto end;
1564
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
2182
NULL, 0, browse_callback, NULL);
1566
2183
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
1568
2186
avahi_strerror(avahi_server_errno(mc.server)));
1569
2187
exitcode = EX_UNAVAILABLE;
1570
2188
goto end;
1577
2195
/* Run the main loop */
1578
2196
1579
2197
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2200
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2204
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2208
}
1584
2209
1585
2210
end:
1586
2211
1587
2212
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
1589
2215
}
1590
2216
1591
2217
/* Cleanup things */
1607
2233
if(gpgme_initialized){
1608
2234
gpgme_release(mc.ctx);
1609
2235
}
2236
2237
/* Cleans up the circular linked list of Mandos servers the client
2238
has seen */
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2245
}
2246
}
2247
2248
/* XXX run network hooks "stop" here */
1610
2249
1611
2250
/* Take down the network interface */
1612
2251
if(take_down_interface){
1614
2253
errno = 0;
1615
2254
ret = seteuid(0);
1616
2255
if(ret == -1){
1617
perror("seteuid");
2256
perror_plus("seteuid");
1618
2257
}
1619
2258
if(geteuid() == 0){
1620
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
2260
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
1624
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
2265
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1628
2267
}
1629
2268
}
1630
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
2270
if(ret == -1){
1632
perror("close");
2271
perror_plus("close");
1633
2272
}
1634
2273
/* Lower privileges permanently */
1635
2274
errno = 0;
1636
2275
ret = setuid(uid);
1637
2276
if(ret == -1){
1638
perror("setuid");
2277
perror_plus("setuid");
1639
2278
}
1640
2279
}
1641
2280
}
1642
2281
1643
/* Removes the temp directory used by GPGME */
2282
/* Removes the GPGME temp directory and all files inside */
1644
2283
if(tempdir_created){
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
}
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
1665
2291
char *fullname = NULL;
1666
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2293
direntry->d_name);
1668
2294
if(ret < 0){
1669
perror("asprintf");
2295
perror_plus("asprintf");
1670
2296
continue;
1671
2297
}
1672
2298
ret = remove(fullname);
1673
2299
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1676
2302
}
1677
2303
free(fullname);
1678
2304
}
1679
closedir(d);
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
1680
2311
}
1681
2312
ret = rmdir(tempdir);
1682
2313
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2314
perror_plus("rmdir");
1684
2315
}
1685
2316
}
1686
2317
1691
2322
&old_sigterm_action,
1692
2323
NULL));
1693
2324
if(ret == -1){
1694
perror("sigaction");
2325
perror_plus("sigaction");
1695
2326
}
1696
2327
do {
1697
2328
ret = raise(signal_received);
1698
2329
} while(ret != 0 and errno == EINTR);
1699
2330
if(ret != 0){
1700
perror("raise");
2331
perror_plus("raise");
1701
2332
abort();
1702
2333
}
1703
2334
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0