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- Committer: teddy at bsnet
- Date: 2010-09-27 17:53:53 UTC
- Revision ID: teddy@fukt.bsnet.se-20100927175353-skms2ds4cjswpf4t
* debian/mandos-client.README.Debian: Remove warning about --connect
not looping, since it now does.
not looping, since it now does.
- files removed:
- debian/mandos-client.examples
- debian/source
- 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
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
87
96
88
#ifdef __linux__
97
89
#include <sys/klog.h> /* klogctl() */
115
107
init_gnutls_session(),
116
108
GNUTLS_* */
117
109
#include <gnutls/openpgp.h>
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
120
112
121
113
/* GPGME */
122
114
#include <gpgme.h> /* All GPGME types, constants and
130
122
#define PATHDIR "/conf/conf.d/mandos"
131
123
#define SECKEY "seckey.txt"
132
124
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
125
135
126
bool debug = false;
136
127
static const char mandos_protocol_version[] = "1";
137
128
const char *argp_program_version = "mandos-client " VERSION;
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
139
130
static const char sys_class_net[] = "/sys/class/net";
140
131
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
145
/* Doubly linked list that need to be circularly linked when used */
146
typedef struct server{
147
const char *ip;
148
uint16_t port;
149
AvahiIfIndex if_index;
150
int af;
151
struct timespec last_seen;
152
struct server *next;
153
struct server *prev;
154
} server;
155
132
156
133
/* Used for passing in values through the Avahi callback functions */
157
134
typedef struct {
162
139
gnutls_dh_params_t dh_params;
163
140
const char *priority;
164
141
gpgme_ctx_t ctx;
165
server *current_server;
166
142
} mandos_context;
167
143
168
144
/* global context so signal handler can reach it*/
169
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
146
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
148
174
149
sig_atomic_t quit_now = 0;
175
150
int signal_received = 0;
176
151
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
152
/*
197
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
154
* bytes. "buffer_capacity" is how much is currently allocated,
199
155
* "buffer_length" is how much is already used.
200
156
*/
201
157
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
158
size_t buffer_capacity){
203
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
161
if(buffer == NULL){
210
166
return buffer_capacity;
211
167
}
212
168
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
216
int ret;
217
server *new_server = malloc(sizeof(server));
218
if(new_server == NULL){
219
perror_plus("malloc");
220
return false;
221
}
222
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
226
if(new_server->ip == NULL){
227
perror_plus("strdup");
228
return false;
229
}
230
/* Special case of first server */
231
if (mc.current_server == NULL){
232
new_server->next = new_server;
233
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
236
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
239
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
246
}
247
return true;
248
}
249
250
169
/*
251
170
* Initialize GPGME.
252
171
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
255
174
gpgme_error_t rc;
256
175
gpgme_engine_info_t engine_info;
257
176
266
185
267
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
268
187
if(fd == -1){
269
perror_plus("open");
188
perror("open");
270
189
return false;
271
190
}
272
191
273
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
274
193
if(rc != GPG_ERR_NO_ERROR){
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
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));
277
196
return false;
278
197
}
279
198
280
199
rc = gpgme_op_import(mc.ctx, pgp_data);
281
200
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
284
203
return false;
285
204
}
286
205
287
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
288
207
if(ret == -1){
289
perror_plus("close");
208
perror("close");
290
209
}
291
210
gpgme_data_release(pgp_data);
292
211
return true;
293
212
}
294
213
295
214
if(debug){
296
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
297
216
}
298
217
299
218
/* Init GPGME */
300
219
gpgme_check_version(NULL);
301
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
302
221
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
305
224
return false;
306
225
}
307
226
308
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
309
228
rc = gpgme_get_engine_info(&engine_info);
310
229
if(rc != GPG_ERR_NO_ERROR){
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
313
232
return false;
314
233
}
315
234
while(engine_info != NULL){
321
240
engine_info = engine_info->next;
322
241
}
323
242
if(engine_info == NULL){
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
326
244
return false;
327
245
}
328
246
329
247
/* Create new GPGME "context" */
330
248
rc = gpgme_new(&(mc.ctx));
331
249
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
335
252
return false;
336
253
}
337
254
356
273
ssize_t plaintext_length = 0;
357
274
358
275
if(debug){
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
360
277
}
361
278
362
279
/* Create new GPGME data buffer from memory cryptotext */
363
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
364
281
0);
365
282
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
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));
368
285
return -1;
369
286
}
370
287
371
288
/* Create new empty GPGME data buffer for the plaintext */
372
289
rc = gpgme_data_new(&dh_plain);
373
290
if(rc != GPG_ERR_NO_ERROR){
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
377
293
gpgme_data_release(dh_crypto);
378
294
return -1;
379
295
}
382
298
data buffer */
383
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
384
300
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
387
303
plaintext_length = -1;
388
304
if(debug){
389
305
gpgme_decrypt_result_t result;
390
306
result = gpgme_op_decrypt_result(mc.ctx);
391
307
if(result == NULL){
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
393
309
} else {
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
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);
398
314
if(result->file_name != NULL){
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
400
316
}
401
317
gpgme_recipient_t recipient;
402
318
recipient = result->recipients;
403
319
while(recipient != NULL){
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "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");
411
326
recipient = recipient->next;
412
327
}
413
328
}
416
331
}
417
332
418
333
if(debug){
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
420
335
}
421
336
422
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
423
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
424
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
425
340
plaintext_length = -1;
426
341
goto decrypt_end;
427
342
}
429
344
*plaintext = NULL;
430
345
while(true){
431
346
plaintext_capacity = incbuffer(plaintext,
432
(size_t)plaintext_length,
433
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
434
349
if(plaintext_capacity == 0){
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
438
353
}
439
354
440
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
445
360
break;
446
361
}
447
362
if(ret < 0){
448
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
449
364
plaintext_length = -1;
450
365
goto decrypt_end;
451
366
}
453
368
}
454
369
455
370
if(debug){
456
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
457
372
for(ssize_t i = 0; i < plaintext_length; i++){
458
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
459
374
}
481
396
/* GnuTLS log function callback */
482
397
static void debuggnutls(__attribute__((unused)) int level,
483
398
const char* string){
484
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
485
400
}
486
401
487
402
static int init_gnutls_global(const char *pubkeyfilename,
489
404
int ret;
490
405
491
406
if(debug){
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
493
408
}
494
409
495
410
ret = gnutls_global_init();
496
411
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
499
414
return -1;
500
415
}
501
416
508
423
}
509
424
510
425
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
512
427
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
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));
515
433
gnutls_global_deinit();
516
434
return -1;
517
435
}
518
436
519
437
if(debug){
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
524
441
}
525
442
526
443
ret = gnutls_certificate_set_openpgp_key_file
527
444
(mc.cred, pubkeyfilename, seckeyfilename,
528
445
GNUTLS_OPENPGP_FMT_BASE64);
529
446
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
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));
535
452
goto globalfail;
536
453
}
537
454
538
455
/* GnuTLS server initialization */
539
456
ret = gnutls_dh_params_init(&mc.dh_params);
540
457
if(ret != GNUTLS_E_SUCCESS){
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
544
460
goto globalfail;
545
461
}
546
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
463
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
550
466
goto globalfail;
551
467
}
552
468
572
488
}
573
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
490
if(ret != GNUTLS_E_SUCCESS){
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
578
493
}
579
494
580
495
{
587
502
}
588
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
504
if(ret != GNUTLS_E_SUCCESS){
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
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));
593
508
gnutls_deinit(*session);
594
509
return -1;
595
510
}
604
519
}
605
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
521
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
609
524
gnutls_deinit(*session);
610
525
return -1;
611
526
}
656
571
pf = PF_INET;
657
572
break;
658
573
default:
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
660
575
errno = EINVAL;
661
576
return -1;
662
577
}
667
582
}
668
583
669
584
if(debug){
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
672
587
}
673
588
674
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
675
590
if(tcp_sd < 0){
676
591
int e = errno;
677
perror_plus("socket");
592
perror("socket");
678
593
errno = e;
679
594
goto mandos_end;
680
595
}
694
609
}
695
610
if(ret < 0 ){
696
611
int e = errno;
697
perror_plus("inet_pton");
612
perror("inet_pton");
698
613
errno = e;
699
614
goto mandos_end;
700
615
}
701
616
if(ret == 0){
702
617
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
704
619
errno = e;
705
620
goto mandos_end;
706
621
}
711
626
712
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
629
-Wunreachable-code*/
715
630
if(if_index == AVAHI_IF_UNSPEC){
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
718
633
errno = EINVAL;
719
634
goto mandos_end;
720
635
}
736
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
737
652
char interface[IF_NAMESIZE];
738
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
perror_plus("if_indextoname");
654
perror("if_indextoname");
740
655
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
743
658
}
744
659
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
747
662
}
748
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
756
671
sizeof(addrstr));
757
672
}
758
673
if(pcret == NULL){
759
perror_plus("inet_ntop");
674
perror("inet_ntop");
760
675
} else {
761
676
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
763
678
}
764
679
}
765
680
}
777
692
if(ret < 0){
778
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
694
int e = errno;
780
perror_plus("connect");
695
perror("connect");
781
696
errno = e;
782
697
}
783
698
goto mandos_end;
793
708
while(true){
794
709
size_t out_size = strlen(out);
795
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
796
out_size - written));
711
out_size - written));
797
712
if(ret == -1){
798
713
int e = errno;
799
perror_plus("write");
714
perror("write");
800
715
errno = e;
801
716
goto mandos_end;
802
717
}
819
734
}
820
735
821
736
if(debug){
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
823
738
}
824
739
825
740
if(quit_now){
827
742
goto mandos_end;
828
743
}
829
744
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
835
746
836
747
if(quit_now){
837
748
errno = EINTR;
848
759
849
760
if(ret != GNUTLS_E_SUCCESS){
850
761
if(debug){
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
852
763
gnutls_perror(ret);
853
764
}
854
765
errno = EPROTO;
858
769
/* Read OpenPGP packet that contains the wanted password */
859
770
860
771
if(debug){
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
863
774
}
864
775
865
776
while(true){
870
781
}
871
782
872
783
buffer_capacity = incbuffer(&buffer, buffer_length,
873
buffer_capacity);
784
buffer_capacity);
874
785
if(buffer_capacity == 0){
875
786
int e = errno;
876
perror_plus("incbuffer");
787
perror("incbuffer");
877
788
errno = e;
878
789
goto mandos_end;
879
790
}
903
814
}
904
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
816
if(ret < 0){
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
908
818
gnutls_perror(ret);
909
819
errno = EPROTO;
910
820
goto mandos_end;
911
821
}
912
822
break;
913
823
default:
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
916
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
827
errno = EIO;
918
828
goto mandos_end;
923
833
}
924
834
925
835
if(debug){
926
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
927
837
}
928
838
929
839
if(quit_now){
941
851
942
852
if(buffer_length > 0){
943
853
ssize_t decrypted_buffer_size;
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
945
856
&decrypted_buffer);
946
857
if(decrypted_buffer_size >= 0){
947
858
958
869
if(ret == 0 and ferror(stdout)){
959
870
int e = errno;
960
871
if(debug){
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
963
874
}
964
875
errno = e;
965
876
goto mandos_end;
984
895
if(e == 0){
985
896
e = errno;
986
897
}
987
perror_plus("close");
898
perror("close");
988
899
}
989
900
gnutls_deinit(session);
990
errno = e;
991
901
if(quit_now){
992
errno = EINTR;
902
e = EINTR;
993
903
retval = -1;
994
904
}
905
errno = e;
995
906
}
996
907
return retval;
997
908
}
1022
933
switch(event){
1023
934
default:
1024
935
case AVAHI_RESOLVER_FAILURE:
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
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)));
1029
939
break;
1030
940
1031
941
case AVAHI_RESOLVER_FOUND:
1033
943
char ip[AVAHI_ADDRESS_STR_MAX];
1034
944
avahi_address_snprint(ip, sizeof(ip), address);
1035
945
if(debug){
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
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);
1039
949
}
1040
950
int ret = start_mandos_communication(ip, port, interface,
1041
951
avahi_proto_to_af(proto));
1042
952
if(ret == 0){
1043
953
avahi_simple_poll_quit(mc.simple_poll);
1044
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
1050
954
}
1051
955
}
1052
956
}
1076
980
default:
1077
981
case AVAHI_BROWSER_FAILURE:
1078
982
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1081
985
avahi_simple_poll_quit(mc.simple_poll);
1082
986
return;
1083
987
1090
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
995
name, type, domain, protocol, 0,
1092
996
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
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)));
1096
999
break;
1097
1000
1098
1001
case AVAHI_BROWSER_REMOVE:
1101
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
1006
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
1008
}
1107
1009
break;
1108
1010
}
1109
1011
}
1110
1012
1111
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1112
1014
static void handle_sigterm(int sig){
1113
1015
if(quit_now){
1114
1016
return;
1116
1018
quit_now = 1;
1117
1019
signal_received = sig;
1118
1020
int old_errno = errno;
1119
/* set main loop to exit */
1120
1021
if(mc.simple_poll != NULL){
1121
1022
avahi_simple_poll_quit(mc.simple_poll);
1122
1023
}
1123
1024
errno = old_errno;
1124
1025
}
1125
1026
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
1027
/*
1193
1028
* This function determines if a directory entry in /sys/class/net
1194
1029
* corresponds to an acceptable network device.
1195
1030
* (This function is passed to scandir(3) as a filter function.)
1196
1031
*/
1197
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
}
1198
1041
if(if_entry->d_name[0] == '.'){
1199
1042
return 0;
1200
1043
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
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){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
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
}
1114
/* Accept this device */
1314
1115
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1317
1118
}
1318
1119
return 1;
1319
1120
}
1320
1121
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
1743
1122
int main(int argc, char *argv[]){
1744
1123
AvahiSServiceBrowser *sb = NULL;
1745
error_t ret_errno;
1124
int error;
1746
1125
int ret;
1747
1126
intmax_t tmpmax;
1748
1127
char *tmp;
1749
1128
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1754
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1755
1136
bool tempdir_created = false;
1756
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
1138
const char *seckey = PATHDIR "/" SECKEY;
1758
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
1140
1762
1141
bool gnutls_initialized = false;
1763
1142
bool gpgme_initialized = false;
1764
1143
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1767
1144
1768
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1769
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1775
1152
errno = 0;
1776
1153
ret = setgid(gid);
1777
1154
if(ret == -1){
1778
perror_plus("setgid");
1155
perror("setgid");
1779
1156
}
1780
1157
1781
1158
/* Lower user privileges (temporarily) */
1782
1159
errno = 0;
1783
1160
ret = seteuid(uid);
1784
1161
if(ret == -1){
1785
perror_plus("seteuid");
1162
perror("seteuid");
1786
1163
}
1787
1164
1788
1165
if(quit_now){
1823
1200
.arg = "SECONDS",
1824
1201
.doc = "Maximum delay to wait for interface startup",
1825
1202
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
1203
/*
1835
1204
* These reproduce what we would get without ARGP_NO_HELP
1836
1205
*/
1854
1223
connect_to = arg;
1855
1224
break;
1856
1225
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1226
interface = arg;
1862
1227
break;
1863
1228
case 's': /* --seckey */
1864
1229
seckey = arg;
1884
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1885
1250
argp_error(state, "Bad delay");
1886
1251
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
1252
break;
1899
1253
/*
1900
1254
* These reproduce what we would get without ARGP_NO_HELP
1907
1261
argp_state_help(state, state->out_stream,
1908
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
1263
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1911
1265
exit(argp_err_exit_status);
1912
1266
break;
1913
1267
default:
1928
1282
case ENOMEM:
1929
1283
default:
1930
1284
errno = ret;
1931
perror_plus("argp_parse");
1285
perror("argp_parse");
1932
1286
exitcode = EX_OSERR;
1933
1287
goto end;
1934
1288
case EINVAL:
1936
1290
goto end;
1937
1291
}
1938
1292
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2028
}
2029
1293
2030
1294
if(not debug){
2031
1295
avahi_set_log_function(empty_log);
2032
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
2033
1322
2034
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2035
1324
from the signal handler */
2037
1326
srand((unsigned int) time(NULL));
2038
1327
mc.simple_poll = avahi_simple_poll_new();
2039
1328
if(mc.simple_poll == NULL){
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2042
1330
exitcode = EX_UNAVAILABLE;
2043
1331
goto end;
2044
1332
}
2046
1334
sigemptyset(&sigterm_action.sa_mask);
2047
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2048
1336
if(ret == -1){
2049
perror_plus("sigaddset");
1337
perror("sigaddset");
2050
1338
exitcode = EX_OSERR;
2051
1339
goto end;
2052
1340
}
2053
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2054
1342
if(ret == -1){
2055
perror_plus("sigaddset");
1343
perror("sigaddset");
2056
1344
exitcode = EX_OSERR;
2057
1345
goto end;
2058
1346
}
2059
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2060
1348
if(ret == -1){
2061
perror_plus("sigaddset");
1349
perror("sigaddset");
2062
1350
exitcode = EX_OSERR;
2063
1351
goto end;
2064
1352
}
2068
1356
*/
2069
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2070
1358
if(ret == -1){
2071
perror_plus("sigaction");
1359
perror("sigaction");
2072
1360
return EX_OSERR;
2073
1361
}
2074
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2075
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2076
1364
if(ret == -1){
2077
perror_plus("sigaction");
1365
perror("sigaction");
2078
1366
exitcode = EX_OSERR;
2079
1367
goto end;
2080
1368
}
2081
1369
}
2082
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2083
1371
if(ret == -1){
2084
perror_plus("sigaction");
1372
perror("sigaction");
2085
1373
return EX_OSERR;
2086
1374
}
2087
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2088
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2089
1377
if(ret == -1){
2090
perror_plus("sigaction");
1378
perror("sigaction");
2091
1379
exitcode = EX_OSERR;
2092
1380
goto end;
2093
1381
}
2094
1382
}
2095
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2096
1384
if(ret == -1){
2097
perror_plus("sigaction");
1385
perror("sigaction");
2098
1386
return EX_OSERR;
2099
1387
}
2100
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2101
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2102
1390
if(ret == -1){
2103
perror_plus("sigaction");
1391
perror("sigaction");
2104
1392
exitcode = EX_OSERR;
2105
1393
goto end;
2106
1394
}
2107
1395
}
2108
1396
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
1397
/* If the interface is down, bring it up */
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
}
2130
1532
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
2164
1537
}
2165
1538
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
1539
}
2173
1540
2174
1541
if(quit_now){
2177
1544
2178
1545
ret = init_gnutls_global(pubkey, seckey);
2179
1546
if(ret == -1){
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2181
1548
exitcode = EX_UNAVAILABLE;
2182
1549
goto end;
2183
1550
} else {
2188
1555
goto end;
2189
1556
}
2190
1557
1558
tempdir_created = true;
2191
1559
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2193
1562
goto end;
2194
1563
}
2195
tempdir_created = true;
2196
1564
2197
1565
if(quit_now){
2198
1566
goto end;
2199
1567
}
2200
1568
2201
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2202
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2203
1571
exitcode = EX_UNAVAILABLE;
2204
1572
goto end;
2205
1573
} else {
2214
1582
/* Connect directly, do not use Zeroconf */
2215
1583
/* (Mainly meant for debugging) */
2216
1584
char *address = strrchr(connect_to, ':');
2217
2218
1585
if(address == NULL){
2219
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2220
1587
exitcode = EX_USAGE;
2221
1588
goto end;
2222
1589
}
2230
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2231
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
1599
or tmpmax != (uint16_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2234
1601
exitcode = EX_USAGE;
2235
1602
goto end;
2236
1603
}
2241
1608
2242
1609
port = (uint16_t)tmpmax;
2243
1610
*address = '\0';
1611
address = connect_to;
2244
1612
/* Colon in address indicates IPv6 */
2245
1613
int af;
2246
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2247
1615
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
2254
1616
} else {
2255
1617
af = AF_INET;
2256
1618
}
2257
address = connect_to;
2258
1619
2259
1620
if(quit_now){
2260
1621
goto end;
2261
1622
}
2262
1623
2263
1624
while(not quit_now){
2264
1625
ret = start_mandos_communication(address, port, if_index, af);
2265
1626
if(quit_now or ret == 0){
2266
1627
break;
2267
1628
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
1629
sleep(15);
1630
};
1631
2275
1632
if (not quit_now){
2276
1633
exitcode = EXIT_SUCCESS;
2277
1634
}
2278
1635
2279
1636
goto end;
2280
1637
}
2281
1638
2295
1652
/* Allocate a new server */
2296
1653
mc.server = avahi_server_new(avahi_simple_poll_get
2297
1654
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
1655
NULL, &error);
2299
1656
2300
1657
/* Free the Avahi configuration data */
2301
1658
avahi_server_config_free(&config);
2303
1660
2304
1661
/* Check if creating the Avahi server object succeeded */
2305
1662
if(mc.server == NULL){
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2308
1665
exitcode = EX_UNAVAILABLE;
2309
1666
goto end;
2310
1667
}
2318
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
1676
NULL, 0, browse_callback, NULL);
2320
1677
if(sb == NULL){
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
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)));
2323
1680
exitcode = EX_UNAVAILABLE;
2324
1681
goto end;
2325
1682
}
2331
1688
/* Run the main loop */
2332
1689
2333
1690
if(debug){
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2343
1695
2344
1696
end:
2345
1697
2346
1698
if(debug){
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2348
1700
}
2349
1701
2350
1702
/* Cleanup things */
2367
1719
gpgme_release(mc.ctx);
2368
1720
}
2369
1721
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
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");
2378
1729
}
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2398
1739
}
2399
1740
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2403
1750
}
2404
1751
}
2405
2406
lower_privileges_permanently();
2407
1752
}
2408
1753
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2413
1755
if(tempdir_created){
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
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
}
2421
1776
char *fullname = NULL;
2422
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
1778
direntry->d_name);
2424
1779
if(ret < 0){
2425
perror_plus("asprintf");
1780
perror("asprintf");
2426
1781
continue;
2427
1782
}
2428
1783
ret = remove(fullname);
2429
1784
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2432
1787
}
2433
1788
free(fullname);
2434
1789
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
1790
closedir(d);
2441
1791
}
2442
1792
ret = rmdir(tempdir);
2443
1793
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
1794
perror("rmdir");
2445
1795
}
2446
1796
}
2447
1797
2452
1802
&old_sigterm_action,
2453
1803
NULL));
2454
1804
if(ret == -1){
2455
perror_plus("sigaction");
1805
perror("sigaction");
2456
1806
}
2457
1807
do {
2458
1808
ret = raise(signal_received);
2459
1809
} while(ret != 0 and errno == EINTR);
2460
1810
if(ret != 0){
2461
perror_plus("raise");
1811
perror("raise");
2462
1812
abort();
2463
1813
}
2464
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0