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- Committer: teddy at bsnet
- Date: 2011-12-24 23:17:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224231702-1ffgu6r02p0bz9co
* plugins.d/splashy.c (error_plus): Check format string.
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- files added:
- DBUS-API
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
86
91
87
92
#ifdef __linux__
88
93
#include <sys/klog.h> /* klogctl() */
106
111
init_gnutls_session(),
107
112
GNUTLS_* */
108
113
#include <gnutls/openpgp.h>
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
111
116
112
117
/* GPGME */
113
118
#include <gpgme.h> /* All GPGME types, constants and
121
126
#define PATHDIR "/conf/conf.d/mandos"
122
127
#define SECKEY "seckey.txt"
123
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
130
125
131
bool debug = false;
126
132
static const char mandos_protocol_version[] = "1";
127
133
const char *argp_program_version = "mandos-client " VERSION;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
129
149
130
150
/* Used for passing in values through the Avahi callback functions */
131
151
typedef struct {
136
156
gnutls_dh_params_t dh_params;
137
157
const char *priority;
138
158
gpgme_ctx_t ctx;
159
server *current_server;
139
160
} mandos_context;
140
161
141
162
/* global context so signal handler can reach it*/
142
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
164
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
145
167
146
168
sig_atomic_t quit_now = 0;
147
169
int signal_received = 0;
148
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
149
188
/*
150
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
190
* bytes. "buffer_capacity" is how much is currently allocated,
152
191
* "buffer_length" is how much is already used.
153
192
*/
154
193
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
194
size_t buffer_capacity){
156
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
197
if(buffer == NULL){
163
202
return buffer_capacity;
164
203
}
165
204
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
208
int ret;
209
server *new_server = malloc(sizeof(server));
210
if(new_server == NULL){
211
perror_plus("malloc");
212
return false;
213
}
214
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
218
if(new_server->ip == NULL){
219
perror_plus("strdup");
220
return false;
221
}
222
/* Special case of first server */
223
if (mc.current_server == NULL){
224
new_server->next = new_server;
225
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
228
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
231
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
238
}
239
return true;
240
}
241
166
242
/*
167
243
* Initialize GPGME.
168
244
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
171
247
gpgme_error_t rc;
172
248
gpgme_engine_info_t engine_info;
173
249
182
258
183
259
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
260
if(fd == -1){
185
perror("open");
261
perror_plus("open");
186
262
return false;
187
263
}
188
264
189
265
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
266
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
193
269
return false;
194
270
}
195
271
196
272
rc = gpgme_op_import(mc.ctx, pgp_data);
197
273
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
200
276
return false;
201
277
}
202
278
203
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
280
if(ret == -1){
205
perror("close");
281
perror_plus("close");
206
282
}
207
283
gpgme_data_release(pgp_data);
208
284
return true;
209
285
}
210
286
211
287
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
288
fprintf_plus(stderr, "Initializing GPGME\n");
213
289
}
214
290
215
291
/* Init GPGME */
216
292
gpgme_check_version(NULL);
217
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
294
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
221
297
return false;
222
298
}
223
299
224
/* Set GPGME home directory for the OpenPGP engine only */
300
/* Set GPGME home directory for the OpenPGP engine only */
225
301
rc = gpgme_get_engine_info(&engine_info);
226
302
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
229
305
return false;
230
306
}
231
307
while(engine_info != NULL){
237
313
engine_info = engine_info->next;
238
314
}
239
315
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
241
318
return false;
242
319
}
243
320
244
321
/* Create new GPGME "context" */
245
322
rc = gpgme_new(&(mc.ctx));
246
323
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
249
327
return false;
250
328
}
251
329
270
348
ssize_t plaintext_length = 0;
271
349
272
350
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
352
}
275
353
276
354
/* Create new GPGME data buffer from memory cryptotext */
277
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
356
0);
279
357
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
282
360
return -1;
283
361
}
284
362
285
363
/* Create new empty GPGME data buffer for the plaintext */
286
364
rc = gpgme_data_new(&dh_plain);
287
365
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
290
369
gpgme_data_release(dh_crypto);
291
370
return -1;
292
371
}
295
374
data buffer */
296
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
376
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
300
379
plaintext_length = -1;
301
380
if(debug){
302
381
gpgme_decrypt_result_t result;
303
382
result = gpgme_op_decrypt_result(mc.ctx);
304
383
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
385
} else {
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
311
390
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
392
}
314
393
gpgme_recipient_t recipient;
315
394
recipient = result->recipients;
316
395
while(recipient != NULL){
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
323
403
recipient = recipient->next;
324
404
}
325
405
}
328
408
}
329
409
330
410
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
412
}
333
413
334
414
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
415
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
416
perror_plus("gpgme_data_seek");
337
417
plaintext_length = -1;
338
418
goto decrypt_end;
339
419
}
341
421
*plaintext = NULL;
342
422
while(true){
343
423
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
424
(size_t)plaintext_length,
425
plaintext_capacity);
346
426
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
350
430
}
351
431
352
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
437
break;
358
438
}
359
439
if(ret < 0){
360
perror("gpgme_data_read");
440
perror_plus("gpgme_data_read");
361
441
plaintext_length = -1;
362
442
goto decrypt_end;
363
443
}
365
445
}
366
446
367
447
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
448
fprintf_plus(stderr, "Decrypted password is: ");
369
449
for(ssize_t i = 0; i < plaintext_length; i++){
370
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
451
}
393
473
/* GnuTLS log function callback */
394
474
static void debuggnutls(__attribute__((unused)) int level,
395
475
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
397
477
}
398
478
399
479
static int init_gnutls_global(const char *pubkeyfilename,
401
481
int ret;
402
482
403
483
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
485
}
406
486
407
487
ret = gnutls_global_init();
408
488
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
411
491
return -1;
412
492
}
413
493
420
500
}
421
501
422
502
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
504
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
430
507
gnutls_global_deinit();
431
508
return -1;
432
509
}
433
510
434
511
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
438
516
}
439
517
440
518
ret = gnutls_certificate_set_openpgp_key_file
441
519
(mc.cred, pubkeyfilename, seckeyfilename,
442
520
GNUTLS_OPENPGP_FMT_BASE64);
443
521
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
449
527
goto globalfail;
450
528
}
451
529
452
530
/* GnuTLS server initialization */
453
531
ret = gnutls_dh_params_init(&mc.dh_params);
454
532
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
457
536
goto globalfail;
458
537
}
459
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
539
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
463
542
goto globalfail;
464
543
}
465
544
485
564
}
486
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
566
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
490
570
}
491
571
492
572
{
499
579
}
500
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
581
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
505
585
gnutls_deinit(*session);
506
586
return -1;
507
587
}
516
596
}
517
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
598
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
521
601
gnutls_deinit(*session);
522
602
return -1;
523
603
}
553
633
gnutls_session_t session;
554
634
int pf; /* Protocol family */
555
635
636
errno = 0;
637
556
638
if(quit_now){
639
errno = EINTR;
557
640
return -1;
558
641
}
559
642
565
648
pf = PF_INET;
566
649
break;
567
650
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
652
errno = EINVAL;
569
653
return -1;
570
654
}
571
655
575
659
}
576
660
577
661
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
580
664
}
581
665
582
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
667
if(tcp_sd < 0){
584
perror("socket");
668
int e = errno;
669
perror_plus("socket");
670
errno = e;
585
671
goto mandos_end;
586
672
}
587
673
588
674
if(quit_now){
675
errno = EINTR;
589
676
goto mandos_end;
590
677
}
591
678
598
685
ret = inet_pton(af, ip, &to.in.sin_addr);
599
686
}
600
687
if(ret < 0 ){
601
perror("inet_pton");
688
int e = errno;
689
perror_plus("inet_pton");
690
errno = e;
602
691
goto mandos_end;
603
692
}
604
693
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
694
int e = errno;
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
696
errno = e;
606
697
goto mandos_end;
607
698
}
608
699
if(af == AF_INET6){
612
703
613
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
706
-Wunreachable-code*/
616
707
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
710
errno = EINVAL;
619
711
goto mandos_end;
620
712
}
621
713
/* Set the network interface number as scope */
628
720
}
629
721
630
722
if(quit_now){
723
errno = EINTR;
631
724
goto mandos_end;
632
725
}
633
726
635
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
729
char interface[IF_NAMESIZE];
637
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
731
perror_plus("if_indextoname");
639
732
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
642
735
}
643
736
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
646
739
}
647
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
655
748
sizeof(addrstr));
656
749
}
657
750
if(pcret == NULL){
658
perror("inet_ntop");
751
perror_plus("inet_ntop");
659
752
} else {
660
753
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
755
}
663
756
}
664
757
}
665
758
666
759
if(quit_now){
760
errno = EINTR;
667
761
goto mandos_end;
668
762
}
669
763
673
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
768
}
675
769
if(ret < 0){
676
perror("connect");
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
677
775
goto mandos_end;
678
776
}
679
777
680
778
if(quit_now){
779
errno = EINTR;
681
780
goto mandos_end;
682
781
}
683
782
686
785
while(true){
687
786
size_t out_size = strlen(out);
688
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
788
out_size - written));
690
789
if(ret == -1){
691
perror("write");
790
int e = errno;
791
perror_plus("write");
792
errno = e;
692
793
goto mandos_end;
693
794
}
694
795
written += (size_t)ret;
704
805
}
705
806
706
807
if(quit_now){
808
errno = EINTR;
707
809
goto mandos_end;
708
810
}
709
811
}
710
812
711
813
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
815
}
714
816
715
817
if(quit_now){
818
errno = EINTR;
716
819
goto mandos_end;
717
820
}
718
821
822
/* Spurious warning from -Wint-to-pointer-cast */
719
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
824
721
825
if(quit_now){
826
errno = EINTR;
722
827
goto mandos_end;
723
828
}
724
829
725
830
do {
726
831
ret = gnutls_handshake(session);
727
832
if(quit_now){
833
errno = EINTR;
728
834
goto mandos_end;
729
835
}
730
836
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
837
732
838
if(ret != GNUTLS_E_SUCCESS){
733
839
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
841
gnutls_perror(ret);
736
842
}
843
errno = EPROTO;
737
844
goto mandos_end;
738
845
}
739
846
740
847
/* Read OpenPGP packet that contains the wanted password */
741
848
742
849
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
745
852
}
746
853
747
854
while(true){
748
855
749
856
if(quit_now){
857
errno = EINTR;
750
858
goto mandos_end;
751
859
}
752
860
753
861
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
862
buffer_capacity);
755
863
if(buffer_capacity == 0){
756
perror("incbuffer");
864
int e = errno;
865
perror_plus("incbuffer");
866
errno = e;
757
867
goto mandos_end;
758
868
}
759
869
760
870
if(quit_now){
871
errno = EINTR;
761
872
goto mandos_end;
762
873
}
763
874
776
887
ret = gnutls_handshake(session);
777
888
778
889
if(quit_now){
890
errno = EINTR;
779
891
goto mandos_end;
780
892
}
781
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
894
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
784
897
gnutls_perror(ret);
898
errno = EPROTO;
785
899
goto mandos_end;
786
900
}
787
901
break;
788
902
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
791
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
906
errno = EIO;
792
907
goto mandos_end;
793
908
}
794
909
} else {
797
912
}
798
913
799
914
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
915
fprintf_plus(stderr, "Closing TLS session\n");
801
916
}
802
917
803
918
if(quit_now){
919
errno = EINTR;
804
920
goto mandos_end;
805
921
}
806
922
807
923
do {
808
924
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
925
if(quit_now){
926
errno = EINTR;
810
927
goto mandos_end;
811
928
}
812
929
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
930
814
931
if(buffer_length > 0){
815
932
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
818
934
&decrypted_buffer);
819
935
if(decrypted_buffer_size >= 0){
820
936
821
937
written = 0;
822
938
while(written < (size_t) decrypted_buffer_size){
823
939
if(quit_now){
940
errno = EINTR;
824
941
goto mandos_end;
825
942
}
826
943
828
945
(size_t)decrypted_buffer_size - written,
829
946
stdout);
830
947
if(ret == 0 and ferror(stdout)){
948
int e = errno;
831
949
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
834
952
}
953
errno = e;
835
954
goto mandos_end;
836
955
}
837
956
written += (size_t)ret;
843
962
/* Shutdown procedure */
844
963
845
964
mandos_end:
846
free(decrypted_buffer);
847
free(buffer);
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
965
{
966
int e = errno;
967
free(decrypted_buffer);
968
free(buffer);
969
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
971
}
972
if(ret == -1){
973
if(e == 0){
974
e = errno;
975
}
976
perror_plus("close");
977
}
978
gnutls_deinit(session);
979
errno = e;
980
if(quit_now){
981
errno = EINTR;
982
retval = -1;
983
}
857
984
}
858
985
return retval;
859
986
}
884
1011
switch(event){
885
1012
default:
886
1013
case AVAHI_RESOLVER_FAILURE:
887
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
888
" of type '%s' in domain '%s': %s\n", name, type, domain,
889
avahi_strerror(avahi_server_errno(mc.server)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
890
1018
break;
891
1019
892
1020
case AVAHI_RESOLVER_FOUND:
894
1022
char ip[AVAHI_ADDRESS_STR_MAX];
895
1023
avahi_address_snprint(ip, sizeof(ip), address);
896
1024
if(debug){
897
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
898
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
899
ip, (intmax_t)interface, port);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
900
1028
}
901
1029
int ret = start_mandos_communication(ip, port, interface,
902
1030
avahi_proto_to_af(proto));
903
1031
if(ret == 0){
904
1032
avahi_simple_poll_quit(mc.simple_poll);
1033
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
905
1039
}
906
1040
}
907
1041
}
931
1065
default:
932
1066
case AVAHI_BROWSER_FAILURE:
933
1067
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
936
1070
avahi_simple_poll_quit(mc.simple_poll);
937
1071
return;
938
1072
945
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
1080
name, type, domain, protocol, 0,
947
1081
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
950
1085
break;
951
1086
952
1087
case AVAHI_BROWSER_REMOVE:
955
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1092
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
959
1095
}
960
1096
break;
961
1097
}
962
1098
}
963
1099
964
/* stop main loop after sigterm has been called */
1100
/* Signal handler that stops main loop after SIGTERM */
965
1101
static void handle_sigterm(int sig){
966
1102
if(quit_now){
967
1103
return;
969
1105
quit_now = 1;
970
1106
signal_received = sig;
971
1107
int old_errno = errno;
1108
/* set main loop to exit */
972
1109
if(mc.simple_poll != NULL){
973
1110
avahi_simple_poll_quit(mc.simple_poll);
974
1111
}
975
1112
errno = old_errno;
976
1113
}
977
1114
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1126
if(debug){
1127
perror_plus("ioctl SIOCGIFFLAGS");
1128
}
1129
return false;
1130
}
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1141
}
1142
return false;
1143
}
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1146
if(debug){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1149
}
1150
return true;
1151
}
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1157
}
1158
return false;
1159
}
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1162
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1165
}
1166
return false;
1167
}
1168
1169
/* Accept this device */
1170
if(debug){
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
int ret;
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1321
1322
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1327
}
1328
ret = avahi_simple_poll_iterate(s, -1);
1329
} else {
1330
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1333
}
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
if(ret == -1){
1337
perror_plus("clock_gettime");
1338
return -1;
1339
}
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1353
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1356
}
1357
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1363
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1365
return 0;
1366
}
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1376
}
1377
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
}
1380
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1383
}
1384
}
1385
}
1386
}
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
978
1517
int main(int argc, char *argv[]){
979
1518
AvahiSServiceBrowser *sb = NULL;
980
1519
int error;
982
1521
intmax_t tmpmax;
983
1522
char *tmp;
984
1523
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1524
const char *interface = "";
986
1525
struct ifreq network;
987
1526
int sd = -1;
988
1527
bool take_down_interface = false;
989
1528
uid_t uid;
990
1529
gid_t gid;
991
char *connect_to = NULL;
992
1530
char tempdir[] = "/tmp/mandosXXXXXX";
993
1531
bool tempdir_created = false;
994
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
998
1536
bool gnutls_initialized = false;
999
1537
bool gpgme_initialized = false;
1000
1538
float delay = 2.5f;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1001
1541
1002
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1549
errno = 0;
1010
1550
ret = setgid(gid);
1011
1551
if(ret == -1){
1012
perror("setgid");
1552
perror_plus("setgid");
1013
1553
}
1014
1554
1015
1555
/* Lower user privileges (temporarily) */
1016
1556
errno = 0;
1017
1557
ret = seteuid(uid);
1018
1558
if(ret == -1){
1019
perror("seteuid");
1559
perror_plus("seteuid");
1020
1560
}
1021
1561
1022
1562
if(quit_now){
1057
1597
.arg = "SECONDS",
1058
1598
.doc = "Maximum delay to wait for interface startup",
1059
1599
.group = 2 },
1600
{ .name = "retry", .key = 132,
1601
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1060
1608
/*
1061
1609
* These reproduce what we would get without ARGP_NO_HELP
1062
1610
*/
1106
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1655
argp_error(state, "Bad delay");
1108
1656
}
1657
case 132: /* --retry */
1658
errno = 0;
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1664
}
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1109
1668
break;
1110
1669
/*
1111
1670
* These reproduce what we would get without ARGP_NO_HELP
1118
1677
argp_state_help(state, state->out_stream,
1119
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
1679
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
1681
exit(argp_err_exit_status);
1123
1682
break;
1124
1683
default:
1139
1698
case ENOMEM:
1140
1699
default:
1141
1700
errno = ret;
1142
perror("argp_parse");
1701
perror_plus("argp_parse");
1143
1702
exitcode = EX_OSERR;
1144
1703
goto end;
1145
1704
case EINVAL:
1147
1706
goto end;
1148
1707
}
1149
1708
}
1709
1710
{
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1713
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1776
}
1150
1777
1151
1778
if(not debug){
1152
1779
avahi_set_log_function(empty_log);
1153
1780
}
1154
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1155
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1815
from the signal handler */
1157
1816
/* Initialize the pseudo-RNG for Avahi */
1158
1817
srand((unsigned int) time(NULL));
1159
1818
mc.simple_poll = avahi_simple_poll_new();
1160
1819
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1822
exitcode = EX_UNAVAILABLE;
1163
1823
goto end;
1164
1824
}
1165
1825
1166
1826
sigemptyset(&sigterm_action.sa_mask);
1167
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
1828
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1171
1831
goto end;
1172
1832
}
1173
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
1834
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1835
perror_plus("sigaddset");
1836
exitcode = EX_OSERR;
1177
1837
goto end;
1178
1838
}
1179
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
1840
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1183
1843
goto end;
1184
1844
}
1185
1845
/* Need to check if the handler is SIG_IGN before handling:
1188
1848
*/
1189
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
1850
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1851
perror_plus("sigaction");
1852
return EX_OSERR;
1193
1853
}
1194
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
1856
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1857
perror_plus("sigaction");
1858
exitcode = EX_OSERR;
1199
1859
goto end;
1200
1860
}
1201
1861
}
1202
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
1863
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1864
perror_plus("sigaction");
1865
return EX_OSERR;
1206
1866
}
1207
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
1869
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1870
perror_plus("sigaction");
1871
exitcode = EX_OSERR;
1212
1872
goto end;
1213
1873
}
1214
1874
}
1215
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
1876
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1877
perror_plus("sigaction");
1878
return EX_OSERR;
1219
1879
}
1220
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
1882
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1883
perror_plus("sigaction");
1884
exitcode = EX_OSERR;
1225
1885
goto end;
1226
1886
}
1227
1887
}
1228
1888
1229
1889
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1890
if(strcmp(interface, "none") != 0){
1231
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1892
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1235
1895
goto end;
1236
1896
}
1237
1897
1243
1903
errno = 0;
1244
1904
ret = seteuid(0);
1245
1905
if(ret == -1){
1246
perror("seteuid");
1906
perror_plus("seteuid");
1247
1907
}
1248
1908
1249
1909
#ifdef __linux__
1253
1913
bool restore_loglevel = true;
1254
1914
if(ret == -1){
1255
1915
restore_loglevel = false;
1256
perror("klogctl");
1916
perror_plus("klogctl");
1257
1917
}
1258
1918
#endif /* __linux__ */
1259
1919
1260
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
1921
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1264
1924
#ifdef __linux__
1265
1925
if(restore_loglevel){
1266
1926
ret = klogctl(7, NULL, 0);
1267
1927
if(ret == -1){
1268
perror("klogctl");
1928
perror_plus("klogctl");
1269
1929
}
1270
1930
}
1271
1931
#endif /* __linux__ */
1273
1933
errno = 0;
1274
1934
ret = seteuid(uid);
1275
1935
if(ret == -1){
1276
perror("seteuid");
1936
perror_plus("seteuid");
1277
1937
}
1278
1938
goto end;
1279
1939
}
1280
1940
strcpy(network.ifr_name, interface);
1281
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
1942
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1943
perror_plus("ioctl SIOCGIFFLAGS");
1284
1944
#ifdef __linux__
1285
1945
if(restore_loglevel){
1286
1946
ret = klogctl(7, NULL, 0);
1287
1947
if(ret == -1){
1288
perror("klogctl");
1948
perror_plus("klogctl");
1289
1949
}
1290
1950
}
1291
1951
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1952
exitcode = EX_OSERR;
1293
1953
/* Lower privileges */
1294
1954
errno = 0;
1295
1955
ret = seteuid(uid);
1296
1956
if(ret == -1){
1297
perror("seteuid");
1957
perror_plus("seteuid");
1298
1958
}
1299
1959
goto end;
1300
1960
}
1304
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
1965
if(ret == -1){
1306
1966
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1309
1969
#ifdef __linux__
1310
1970
if(restore_loglevel){
1311
1971
ret = klogctl(7, NULL, 0);
1312
1972
if(ret == -1){
1313
perror("klogctl");
1973
perror_plus("klogctl");
1314
1974
}
1315
1975
}
1316
1976
#endif /* __linux__ */
1318
1978
errno = 0;
1319
1979
ret = seteuid(uid);
1320
1980
if(ret == -1){
1321
perror("seteuid");
1981
perror_plus("seteuid");
1322
1982
}
1323
1983
goto end;
1324
1984
}
1325
1985
}
1326
/* sleep checking until interface is running */
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1327
1988
for(int i=0; i < delay * 4; i++){
1328
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
1990
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1991
perror_plus("ioctl SIOCGIFFLAGS");
1331
1992
} else if(network.ifr_flags & IFF_RUNNING){
1332
1993
break;
1333
1994
}
1334
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
1996
ret = nanosleep(&sleeptime, NULL);
1336
1997
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1998
perror_plus("nanosleep");
1338
1999
}
1339
2000
}
1340
2001
if(not take_down_interface){
1341
2002
/* We won't need the socket anymore */
1342
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
2004
if(ret == -1){
1344
perror("close");
2005
perror_plus("close");
1345
2006
}
1346
2007
}
1347
2008
#ifdef __linux__
1349
2010
/* Restores kernel loglevel to default */
1350
2011
ret = klogctl(7, NULL, 0);
1351
2012
if(ret == -1){
1352
perror("klogctl");
2013
perror_plus("klogctl");
1353
2014
}
1354
2015
}
1355
2016
#endif /* __linux__ */
1356
2017
/* Lower privileges */
1357
2018
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
1370
2023
}
1371
2024
}
1372
2025
1376
2029
1377
2030
ret = init_gnutls_global(pubkey, seckey);
1378
2031
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
1381
2034
goto end;
1382
2035
} else {
1383
2036
gnutls_initialized = true;
1387
2040
goto end;
1388
2041
}
1389
2042
2043
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
2045
goto end;
2046
}
1390
2047
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
2048
1397
2049
if(quit_now){
1398
2050
goto end;
1399
2051
}
1400
2052
1401
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2055
exitcode = EX_UNAVAILABLE;
1404
2056
goto end;
1405
2057
} else {
1406
2058
gpgme_initialized = true;
1415
2067
/* (Mainly meant for debugging) */
1416
2068
char *address = strrchr(connect_to, ':');
1417
2069
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2070
fprintf_plus(stderr, "No colon in address\n");
2071
exitcode = EX_USAGE;
1420
2072
goto end;
1421
2073
}
1422
2074
1429
2081
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
2083
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2084
fprintf_plus(stderr, "Bad port number\n");
2085
exitcode = EX_USAGE;
1434
2086
goto end;
1435
2087
}
1436
2088
1440
2092
1441
2093
port = (uint16_t)tmpmax;
1442
2094
*address = '\0';
1443
address = connect_to;
1444
2095
/* Colon in address indicates IPv6 */
1445
2096
int af;
1446
if(strchr(address, ':') != NULL){
2097
if(strchr(connect_to, ':') != NULL){
1447
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
1448
2105
} else {
1449
2106
af = AF_INET;
1450
2107
}
2108
address = connect_to;
1451
2109
1452
2110
if(quit_now){
1453
2111
goto end;
1454
2112
}
1455
2113
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2114
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2116
if(quit_now or ret == 0){
2117
break;
2118
}
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
2126
if (not quit_now){
1460
2127
exitcode = EXIT_SUCCESS;
1461
2128
}
2129
1462
2130
goto end;
1463
2131
}
1464
2132
1486
2154
1487
2155
/* Check if creating the Avahi server object succeeded */
1488
2156
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2159
exitcode = EX_UNAVAILABLE;
1492
2160
goto end;
1493
2161
}
1494
2162
1501
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
2170
NULL, 0, browse_callback, NULL);
1503
2171
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
1507
2175
goto end;
1508
2176
}
1509
2177
1514
2182
/* Run the main loop */
1515
2183
1516
2184
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2190
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
2193
}
1521
2194
1522
2195
end:
1523
2196
1524
2197
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2199
}
1527
2200
1528
2201
/* Cleanup things */
1545
2218
gpgme_release(mc.ctx);
1546
2219
}
1547
2220
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2221
/* Cleans up the circular linked list of Mandos servers the client
2222
has seen */
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2229
}
2230
}
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
1551
2237
errno = 0;
1552
2238
ret = seteuid(0);
1553
2239
if(ret == -1){
1554
perror("seteuid");
2240
perror_plus("seteuid");
1555
2241
}
1556
if(geteuid() == 0){
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
1557
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
2246
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
1561
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
2251
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1565
2253
}
1566
2254
}
1567
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
2256
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
2257
perror_plus("close");
1576
2258
}
1577
2259
}
1578
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
1579
2267
1580
/* Removes the temp directory used by GPGME */
2268
/* Removes the GPGME temp directory and all files inside */
1581
2269
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
1602
2277
char *fullname = NULL;
1603
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2279
direntry->d_name);
1605
2280
if(ret < 0){
1606
perror("asprintf");
2281
perror_plus("asprintf");
1607
2282
continue;
1608
2283
}
1609
2284
ret = remove(fullname);
1610
2285
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
1613
2288
}
1614
2289
free(fullname);
1615
2290
}
1616
closedir(d);
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
1617
2297
}
1618
2298
ret = rmdir(tempdir);
1619
2299
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2300
perror_plus("rmdir");
1621
2301
}
1622
2302
}
1623
2303
1628
2308
&old_sigterm_action,
1629
2309
NULL));
1630
2310
if(ret == -1){
1631
perror("sigaction");
2311
perror_plus("sigaction");
1632
2312
}
1633
2313
do {
1634
2314
ret = raise(signal_received);
1635
2315
} while(ret != 0 and errno == EINTR);
1636
2316
if(ret != 0){
1637
perror("raise");
2317
perror_plus("raise");
1638
2318
abort();
1639
2319
}
1640
2320
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0