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237.8.2
(compared to revision 237.22.2)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-02-11 19:02:24 UTC
- mto: (237.7.13 mandos)
- mto: This revision was merged to the branch mainline in revision 282.
- Revision ID: teddy@fukt.bsnet.se-20110211190224-62celso7mswtep65
* mandos-monitor: Use unicode string literals. Update __future__
import line to use all available and applicable
imports.
import line to use all available and applicable
imports.
- files removed:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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 */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
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
#include <grp.h> /* setgroups() */
91
87
92
88
#ifdef __linux__
93
89
#include <sys/klog.h> /* klogctl() */
111
107
init_gnutls_session(),
112
108
GNUTLS_* */
113
109
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
116
112
117
113
/* GPGME */
118
114
#include <gpgme.h> /* All GPGME types, constants and
126
122
#define PATHDIR "/conf/conf.d/mandos"
127
123
#define SECKEY "seckey.txt"
128
124
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
125
131
126
bool debug = false;
132
127
static const char mandos_protocol_version[] = "1";
133
128
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
130
static const char sys_class_net[] = "/sys/class/net";
136
131
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
151
132
152
133
/* Used for passing in values through the Avahi callback functions */
153
134
typedef struct {
158
139
gnutls_dh_params_t dh_params;
159
140
const char *priority;
160
141
gpgme_ctx_t ctx;
161
server *current_server;
162
142
} mandos_context;
163
143
164
144
/* global context so signal handler can reach it*/
165
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
146
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
169
148
170
149
sig_atomic_t quit_now = 0;
171
150
int signal_received = 0;
172
151
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
192
152
/*
193
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
154
* bytes. "buffer_capacity" is how much is currently allocated,
195
155
* "buffer_length" is how much is already used.
196
156
*/
197
157
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
158
size_t buffer_capacity){
199
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
161
if(buffer == NULL){
206
166
return buffer_capacity;
207
167
}
208
168
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
246
169
/*
247
170
* Initialize GPGME.
248
171
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
251
174
gpgme_error_t rc;
252
175
gpgme_engine_info_t engine_info;
253
176
262
185
263
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
187
if(fd == -1){
265
perror_plus("open");
188
perror("open");
266
189
return false;
267
190
}
268
191
269
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
193
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
273
196
return false;
274
197
}
275
198
276
199
rc = gpgme_op_import(mc.ctx, pgp_data);
277
200
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
280
203
return false;
281
204
}
282
205
283
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
207
if(ret == -1){
285
perror_plus("close");
208
perror("close");
286
209
}
287
210
gpgme_data_release(pgp_data);
288
211
return true;
289
212
}
290
213
291
214
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
293
216
}
294
217
295
218
/* Init GPGME */
296
219
gpgme_check_version(NULL);
297
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
221
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
301
224
return false;
302
225
}
303
226
304
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
305
228
rc = gpgme_get_engine_info(&engine_info);
306
229
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
309
232
return false;
310
233
}
311
234
while(engine_info != NULL){
317
240
engine_info = engine_info->next;
318
241
}
319
242
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
244
return false;
323
245
}
324
246
325
247
/* Create new GPGME "context" */
326
248
rc = gpgme_new(&(mc.ctx));
327
249
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
331
252
return false;
332
253
}
333
254
352
273
ssize_t plaintext_length = 0;
353
274
354
275
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
277
}
357
278
358
279
/* Create new GPGME data buffer from memory cryptotext */
359
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
281
0);
361
282
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
364
285
return -1;
365
286
}
366
287
367
288
/* Create new empty GPGME data buffer for the plaintext */
368
289
rc = gpgme_data_new(&dh_plain);
369
290
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
373
293
gpgme_data_release(dh_crypto);
374
294
return -1;
375
295
}
378
298
data buffer */
379
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
300
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
383
303
plaintext_length = -1;
384
304
if(debug){
385
305
gpgme_decrypt_result_t result;
386
306
result = gpgme_op_decrypt_result(mc.ctx);
387
307
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
309
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
394
314
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
396
316
}
397
317
gpgme_recipient_t recipient;
398
318
recipient = result->recipients;
399
319
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
407
326
recipient = recipient->next;
408
327
}
409
328
}
412
331
}
413
332
414
333
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
335
}
417
336
418
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
421
340
plaintext_length = -1;
422
341
goto decrypt_end;
423
342
}
425
344
*plaintext = NULL;
426
345
while(true){
427
346
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
430
349
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
434
353
}
435
354
436
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
360
break;
442
361
}
443
362
if(ret < 0){
444
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
445
364
plaintext_length = -1;
446
365
goto decrypt_end;
447
366
}
449
368
}
450
369
451
370
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
453
372
for(ssize_t i = 0; i < plaintext_length; i++){
454
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
374
}
477
396
/* GnuTLS log function callback */
478
397
static void debuggnutls(__attribute__((unused)) int level,
479
398
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
481
400
}
482
401
483
402
static int init_gnutls_global(const char *pubkeyfilename,
485
404
int ret;
486
405
487
406
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
489
408
}
490
409
491
410
ret = gnutls_global_init();
492
411
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
495
414
return -1;
496
415
}
497
416
504
423
}
505
424
506
425
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
508
427
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
511
433
gnutls_global_deinit();
512
434
return -1;
513
435
}
514
436
515
437
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
520
441
}
521
442
522
443
ret = gnutls_certificate_set_openpgp_key_file
523
444
(mc.cred, pubkeyfilename, seckeyfilename,
524
445
GNUTLS_OPENPGP_FMT_BASE64);
525
446
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
531
452
goto globalfail;
532
453
}
533
454
534
455
/* GnuTLS server initialization */
535
456
ret = gnutls_dh_params_init(&mc.dh_params);
536
457
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
540
460
goto globalfail;
541
461
}
542
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
463
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
546
466
goto globalfail;
547
467
}
548
468
568
488
}
569
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
490
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
574
493
}
575
494
576
495
{
583
502
}
584
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
504
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
589
508
gnutls_deinit(*session);
590
509
return -1;
591
510
}
600
519
}
601
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
521
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
605
524
gnutls_deinit(*session);
606
525
return -1;
607
526
}
652
571
pf = PF_INET;
653
572
break;
654
573
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
656
575
errno = EINVAL;
657
576
return -1;
658
577
}
663
582
}
664
583
665
584
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
668
587
}
669
588
670
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
590
if(tcp_sd < 0){
672
591
int e = errno;
673
perror_plus("socket");
592
perror("socket");
674
593
errno = e;
675
594
goto mandos_end;
676
595
}
690
609
}
691
610
if(ret < 0 ){
692
611
int e = errno;
693
perror_plus("inet_pton");
612
perror("inet_pton");
694
613
errno = e;
695
614
goto mandos_end;
696
615
}
697
616
if(ret == 0){
698
617
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
700
619
errno = e;
701
620
goto mandos_end;
702
621
}
707
626
708
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
629
-Wunreachable-code*/
711
630
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
714
633
errno = EINVAL;
715
634
goto mandos_end;
716
635
}
732
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
652
char interface[IF_NAMESIZE];
734
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
654
perror("if_indextoname");
736
655
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
739
658
}
740
659
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
743
662
}
744
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
671
sizeof(addrstr));
753
672
}
754
673
if(pcret == NULL){
755
perror_plus("inet_ntop");
674
perror("inet_ntop");
756
675
} else {
757
676
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
678
}
760
679
}
761
680
}
773
692
if(ret < 0){
774
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
694
int e = errno;
776
perror_plus("connect");
695
perror("connect");
777
696
errno = e;
778
697
}
779
698
goto mandos_end;
789
708
while(true){
790
709
size_t out_size = strlen(out);
791
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
711
out_size - written));
793
712
if(ret == -1){
794
713
int e = errno;
795
perror_plus("write");
714
perror("write");
796
715
errno = e;
797
716
goto mandos_end;
798
717
}
815
734
}
816
735
817
736
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
819
738
}
820
739
821
740
if(quit_now){
823
742
goto mandos_end;
824
743
}
825
744
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
831
746
832
747
if(quit_now){
833
748
errno = EINTR;
844
759
845
760
if(ret != GNUTLS_E_SUCCESS){
846
761
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
763
gnutls_perror(ret);
849
764
}
850
765
errno = EPROTO;
854
769
/* Read OpenPGP packet that contains the wanted password */
855
770
856
771
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
859
774
}
860
775
861
776
while(true){
866
781
}
867
782
868
783
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
784
buffer_capacity);
870
785
if(buffer_capacity == 0){
871
786
int e = errno;
872
perror_plus("incbuffer");
787
perror("incbuffer");
873
788
errno = e;
874
789
goto mandos_end;
875
790
}
899
814
}
900
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
816
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
818
gnutls_perror(ret);
905
819
errno = EPROTO;
906
820
goto mandos_end;
907
821
}
908
822
break;
909
823
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
912
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
827
errno = EIO;
914
828
goto mandos_end;
919
833
}
920
834
921
835
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
923
837
}
924
838
925
839
if(quit_now){
937
851
938
852
if(buffer_length > 0){
939
853
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
941
856
&decrypted_buffer);
942
857
if(decrypted_buffer_size >= 0){
943
858
954
869
if(ret == 0 and ferror(stdout)){
955
870
int e = errno;
956
871
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
959
874
}
960
875
errno = e;
961
876
goto mandos_end;
980
895
if(e == 0){
981
896
e = errno;
982
897
}
983
perror_plus("close");
898
perror("close");
984
899
}
985
900
gnutls_deinit(session);
986
errno = e;
987
901
if(quit_now){
988
errno = EINTR;
902
e = EINTR;
989
903
retval = -1;
990
904
}
905
errno = e;
991
906
}
992
907
return retval;
993
908
}
1018
933
switch(event){
1019
934
default:
1020
935
case AVAHI_RESOLVER_FAILURE:
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1025
939
break;
1026
940
1027
941
case AVAHI_RESOLVER_FOUND:
1029
943
char ip[AVAHI_ADDRESS_STR_MAX];
1030
944
avahi_address_snprint(ip, sizeof(ip), address);
1031
945
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1035
949
}
1036
950
int ret = start_mandos_communication(ip, port, interface,
1037
951
avahi_proto_to_af(proto));
1038
952
if(ret == 0){
1039
953
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1046
954
}
1047
955
}
1048
956
}
1072
980
default:
1073
981
case AVAHI_BROWSER_FAILURE:
1074
982
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1077
985
avahi_simple_poll_quit(mc.simple_poll);
1078
986
return;
1079
987
1086
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
995
name, type, domain, protocol, 0,
1088
996
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1092
999
break;
1093
1000
1094
1001
case AVAHI_BROWSER_REMOVE:
1097
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
1006
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
1008
}
1103
1009
break;
1104
1010
}
1105
1011
}
1106
1012
1107
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1108
1014
static void handle_sigterm(int sig){
1109
1015
if(quit_now){
1110
1016
return;
1112
1018
quit_now = 1;
1113
1019
signal_received = sig;
1114
1020
int old_errno = errno;
1115
/* set main loop to exit */
1116
1021
if(mc.simple_poll != NULL){
1117
1022
avahi_simple_poll_quit(mc.simple_poll);
1118
1023
}
1119
1024
errno = old_errno;
1120
1025
}
1121
1026
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1133
1081
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1135
1084
}
1136
return false;
1085
free(flagstring);
1086
return 0;
1137
1087
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1143
1090
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1145
1092
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1148
1095
}
1149
return false;
1096
return 0;
1150
1097
}
1151
1098
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1153
1100
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1156
1103
}
1157
return true;
1104
return 1;
1158
1105
}
1159
1106
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1176
1114
/* Accept this device */
1177
1115
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1568
int ret;
1569
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1571
if(if_index == 0){
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
errno = old_errno;
1574
return ENXIO;
1575
}
1576
1577
if(quit_now){
1578
errno = old_errno;
1579
return EINTR;
1580
}
1581
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
if(ret == -1){
1635
ret_errno = errno;
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
errno = old_errno;
1648
return ret_errno;
1649
}
1650
}
1651
/* Sleep checking until interface is running.
1652
Check every 0.25s, up to total time of delay */
1653
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1658
break;
1659
}
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
ret = nanosleep(&sleeptime, NULL);
1662
if(ret == -1 and errno != EINTR){
1663
perror_plus("nanosleep");
1664
}
1665
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1670
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1675
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
1678
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
1682
errno = old_errno;
1683
return 0;
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1684
1120
}
1685
1121
1686
1122
int main(int argc, char *argv[]){
1694
1130
struct ifreq network;
1695
1131
int sd = -1;
1696
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1697
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1698
1136
bool tempdir_created = false;
1699
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1703
1141
bool gnutls_initialized = false;
1704
1142
bool gpgme_initialized = false;
1705
1143
float delay = 2.5f;
1706
double retry_interval = 10; /* 10s between trying a server and
1707
retrying the same server again */
1708
1144
1709
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1710
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1716
1152
errno = 0;
1717
1153
ret = setgid(gid);
1718
1154
if(ret == -1){
1719
perror_plus("setgid");
1155
perror("setgid");
1720
1156
}
1721
1157
1722
1158
/* Lower user privileges (temporarily) */
1723
1159
errno = 0;
1724
1160
ret = seteuid(uid);
1725
1161
if(ret == -1){
1726
perror_plus("seteuid");
1162
perror("seteuid");
1727
1163
}
1728
1164
1729
1165
if(quit_now){
1764
1200
.arg = "SECONDS",
1765
1201
.doc = "Maximum delay to wait for interface startup",
1766
1202
.group = 2 },
1767
{ .name = "retry", .key = 132,
1768
.arg = "SECONDS",
1769
.doc = "Retry interval used when denied by the Mandos server",
1770
.group = 2 },
1771
{ .name = "network-hook-dir", .key = 133,
1772
.arg = "DIR",
1773
.doc = "Directory where network hooks are located",
1774
.group = 2 },
1775
1203
/*
1776
1204
* These reproduce what we would get without ARGP_NO_HELP
1777
1205
*/
1821
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1822
1250
argp_error(state, "Bad delay");
1823
1251
}
1824
case 132: /* --retry */
1825
errno = 0;
1826
retry_interval = strtod(arg, &tmp);
1827
if(errno != 0 or tmp == arg or *tmp != '\0'
1828
or (retry_interval * 1000) > INT_MAX
1829
or retry_interval < 0){
1830
argp_error(state, "Bad retry interval");
1831
}
1832
break;
1833
case 133: /* --network-hook-dir */
1834
hookdir = arg;
1835
1252
break;
1836
1253
/*
1837
1254
* These reproduce what we would get without ARGP_NO_HELP
1844
1261
argp_state_help(state, state->out_stream,
1845
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1846
1263
case 'V': /* --version */
1847
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1848
1265
exit(argp_err_exit_status);
1849
1266
break;
1850
1267
default:
1865
1282
case ENOMEM:
1866
1283
default:
1867
1284
errno = ret;
1868
perror_plus("argp_parse");
1285
perror("argp_parse");
1869
1286
exitcode = EX_OSERR;
1870
1287
goto end;
1871
1288
case EINVAL:
1873
1290
goto end;
1874
1291
}
1875
1292
}
1876
1877
{
1878
/* Work around Debian bug #633582:
1879
<http://bugs.debian.org/633582> */
1880
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
1883
struct stat st;
1884
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1886
int seckey_fd = open(seckey, O_RDONLY);
1887
if(seckey_fd == -1){
1888
perror_plus("open");
1889
} else {
1890
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1891
if(ret == -1){
1892
perror_plus("fstat");
1893
} else {
1894
if(S_ISREG(st.st_mode)
1895
and st.st_uid == 0 and st.st_gid == 0){
1896
ret = fchown(seckey_fd, uid, gid);
1897
if(ret == -1){
1898
perror_plus("fchown");
1899
}
1900
}
1901
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
1903
}
1904
}
1905
1906
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
int pubkey_fd = open(pubkey, O_RDONLY);
1908
if(pubkey_fd == -1){
1909
perror_plus("open");
1910
} else {
1911
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1912
if(ret == -1){
1913
perror_plus("fstat");
1914
} else {
1915
if(S_ISREG(st.st_mode)
1916
and st.st_uid == 0 and st.st_gid == 0){
1917
ret = fchown(pubkey_fd, uid, gid);
1918
if(ret == -1){
1919
perror_plus("fchown");
1920
}
1921
}
1922
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
1927
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
1932
}
1933
}
1934
}
1935
1936
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1939
}
1940
1293
1941
1294
if(not debug){
1942
1295
avahi_set_log_function(empty_log);
1943
1296
}
1944
1297
1945
1298
if(interface[0] == '\0'){
1946
1299
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1949
1301
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
1302
if(ret >= 1){
1957
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1958
1304
interface = strdup(direntries[0]->d_name);
1959
1305
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1961
1307
}
1962
1308
if(interface == NULL){
1963
perror_plus("malloc");
1309
perror("malloc");
1964
1310
free(direntries);
1965
1311
exitcode = EXIT_FAILURE;
1966
1312
goto end;
1968
1314
free(direntries);
1969
1315
} else {
1970
1316
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1972
1318
exitcode = EXIT_FAILURE;
1973
1319
goto end;
1974
1320
}
1980
1326
srand((unsigned int) time(NULL));
1981
1327
mc.simple_poll = avahi_simple_poll_new();
1982
1328
if(mc.simple_poll == NULL){
1983
fprintf_plus(stderr,
1984
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1985
1330
exitcode = EX_UNAVAILABLE;
1986
1331
goto end;
1987
1332
}
1989
1334
sigemptyset(&sigterm_action.sa_mask);
1990
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1991
1336
if(ret == -1){
1992
perror_plus("sigaddset");
1337
perror("sigaddset");
1993
1338
exitcode = EX_OSERR;
1994
1339
goto end;
1995
1340
}
1996
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1997
1342
if(ret == -1){
1998
perror_plus("sigaddset");
1343
perror("sigaddset");
1999
1344
exitcode = EX_OSERR;
2000
1345
goto end;
2001
1346
}
2002
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2003
1348
if(ret == -1){
2004
perror_plus("sigaddset");
1349
perror("sigaddset");
2005
1350
exitcode = EX_OSERR;
2006
1351
goto end;
2007
1352
}
2011
1356
*/
2012
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2013
1358
if(ret == -1){
2014
perror_plus("sigaction");
1359
perror("sigaction");
2015
1360
return EX_OSERR;
2016
1361
}
2017
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2018
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2019
1364
if(ret == -1){
2020
perror_plus("sigaction");
1365
perror("sigaction");
2021
1366
exitcode = EX_OSERR;
2022
1367
goto end;
2023
1368
}
2024
1369
}
2025
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2026
1371
if(ret == -1){
2027
perror_plus("sigaction");
1372
perror("sigaction");
2028
1373
return EX_OSERR;
2029
1374
}
2030
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2031
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2032
1377
if(ret == -1){
2033
perror_plus("sigaction");
1378
perror("sigaction");
2034
1379
exitcode = EX_OSERR;
2035
1380
goto end;
2036
1381
}
2037
1382
}
2038
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2039
1384
if(ret == -1){
2040
perror_plus("sigaction");
1385
perror("sigaction");
2041
1386
return EX_OSERR;
2042
1387
}
2043
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2044
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2045
1390
if(ret == -1){
2046
perror_plus("sigaction");
1391
perror("sigaction");
2047
1392
exitcode = EX_OSERR;
2048
1393
goto end;
2049
1394
}
2050
1395
}
2051
1396
2052
1397
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
2058
1538
}
2059
1539
}
2060
1540
2064
1544
2065
1545
ret = init_gnutls_global(pubkey, seckey);
2066
1546
if(ret == -1){
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2068
1548
exitcode = EX_UNAVAILABLE;
2069
1549
goto end;
2070
1550
} else {
2075
1555
goto end;
2076
1556
}
2077
1557
1558
tempdir_created = true;
2078
1559
if(mkdtemp(tempdir) == NULL){
2079
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2080
1562
goto end;
2081
1563
}
2082
tempdir_created = true;
2083
1564
2084
1565
if(quit_now){
2085
1566
goto end;
2086
1567
}
2087
1568
2088
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2089
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2090
1571
exitcode = EX_UNAVAILABLE;
2091
1572
goto end;
2092
1573
} else {
2101
1582
/* Connect directly, do not use Zeroconf */
2102
1583
/* (Mainly meant for debugging) */
2103
1584
char *address = strrchr(connect_to, ':');
2104
2105
1585
if(address == NULL){
2106
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2107
1587
exitcode = EX_USAGE;
2108
1588
goto end;
2109
1589
}
2117
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2118
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
1599
or tmpmax != (uint16_t)tmpmax){
2120
fprintf_plus(stderr, "Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2121
1601
exitcode = EX_USAGE;
2122
1602
goto end;
2123
1603
}
2128
1608
2129
1609
port = (uint16_t)tmpmax;
2130
1610
*address = '\0';
1611
address = connect_to;
2131
1612
/* Colon in address indicates IPv6 */
2132
1613
int af;
2133
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2134
1615
af = AF_INET6;
2135
/* Accept [] around IPv6 address - see RFC 5952 */
2136
if(connect_to[0] == '[' and address[-1] == ']')
2137
{
2138
connect_to++;
2139
address[-1] = '\0';
2140
}
2141
1616
} else {
2142
1617
af = AF_INET;
2143
1618
}
2144
address = connect_to;
2145
1619
2146
1620
if(quit_now){
2147
1621
goto end;
2148
1622
}
2149
1623
2150
1624
while(not quit_now){
2151
1625
ret = start_mandos_communication(address, port, if_index, af);
2152
1626
if(quit_now or ret == 0){
2153
1627
break;
2154
1628
}
2155
if(debug){
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
(int)retry_interval);
2158
}
2159
sleep((int)retry_interval);
2160
}
2161
1629
sleep(15);
1630
};
1631
2162
1632
if (not quit_now){
2163
1633
exitcode = EXIT_SUCCESS;
2164
1634
}
2165
1635
2166
1636
goto end;
2167
1637
}
2168
1638
2190
1660
2191
1661
/* Check if creating the Avahi server object succeeded */
2192
1662
if(mc.server == NULL){
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2195
1665
exitcode = EX_UNAVAILABLE;
2196
1666
goto end;
2197
1667
}
2205
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
1676
NULL, 0, browse_callback, NULL);
2207
1677
if(sb == NULL){
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2210
1680
exitcode = EX_UNAVAILABLE;
2211
1681
goto end;
2212
1682
}
2218
1688
/* Run the main loop */
2219
1689
2220
1690
if(debug){
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2226
if(debug){
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
(ret == 0) ? "successfully" : "with error");
2229
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2230
1695
2231
1696
end:
2232
1697
2233
1698
if(debug){
2234
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2235
1700
}
2236
1701
2237
1702
/* Cleanup things */
2254
1719
gpgme_release(mc.ctx);
2255
1720
}
2256
1721
2257
/* Cleans up the circular linked list of Mandos servers the client
2258
has seen */
2259
if(mc.current_server != NULL){
2260
mc.current_server->prev->next = NULL;
2261
while(mc.current_server != NULL){
2262
server *next = mc.current_server->next;
2263
free(mc.current_server);
2264
mc.current_server = next;
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
2265
1729
}
2266
}
2267
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2272
{
2273
raise_privileges();
2274
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
1730
if(geteuid() == 0){
2277
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
1732
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2281
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2282
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
1737
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2285
1739
}
2286
1740
}
2287
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
1742
if(ret == -1){
2289
perror_plus("close");
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2290
1750
}
2291
1751
}
2292
1752
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2299
1753
2300
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2301
1755
if(tempdir_created){
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2309
1776
char *fullname = NULL;
2310
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
1778
direntry->d_name);
2312
1779
if(ret < 0){
2313
perror_plus("asprintf");
1780
perror("asprintf");
2314
1781
continue;
2315
1782
}
2316
1783
ret = remove(fullname);
2317
1784
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2320
1787
}
2321
1788
free(fullname);
2322
1789
}
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
1790
closedir(d);
2329
1791
}
2330
1792
ret = rmdir(tempdir);
2331
1793
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
1794
perror("rmdir");
2333
1795
}
2334
1796
}
2335
1797
2340
1802
&old_sigterm_action,
2341
1803
NULL));
2342
1804
if(ret == -1){
2343
perror_plus("sigaction");
1805
perror("sigaction");
2344
1806
}
2345
1807
do {
2346
1808
ret = raise(signal_received);
2347
1809
} while(ret != 0 and errno == EINTR);
2348
1810
if(ret != 0){
2349
perror_plus("raise");
1811
perror("raise");
2350
1812
abort();
2351
1813
}
2352
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0