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237.16.16
(compared to revision 237.2.158)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (237.15.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- 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
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
149
187
/*
150
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
189
* bytes. "buffer_capacity" is how much is currently allocated,
152
190
* "buffer_length" is how much is already used.
153
191
*/
154
192
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
193
size_t buffer_capacity){
156
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
196
if(buffer == NULL){
163
201
return buffer_capacity;
164
202
}
165
203
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
166
241
/*
167
242
* Initialize GPGME.
168
243
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
171
246
gpgme_error_t rc;
172
247
gpgme_engine_info_t engine_info;
173
248
182
257
183
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
259
if(fd == -1){
185
perror("open");
260
perror_plus("open");
186
261
return false;
187
262
}
188
263
189
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
265
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));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
193
268
return false;
194
269
}
195
270
196
271
rc = gpgme_op_import(mc.ctx, pgp_data);
197
272
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
200
275
return false;
201
276
}
202
277
203
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
279
if(ret == -1){
205
perror("close");
280
perror_plus("close");
206
281
}
207
282
gpgme_data_release(pgp_data);
208
283
return true;
209
284
}
210
285
211
286
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
213
288
}
214
289
215
290
/* Init GPGME */
216
291
gpgme_check_version(NULL);
217
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
293
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
221
296
return false;
222
297
}
223
298
224
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
225
300
rc = gpgme_get_engine_info(&engine_info);
226
301
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
229
304
return false;
230
305
}
231
306
while(engine_info != NULL){
237
312
engine_info = engine_info->next;
238
313
}
239
314
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
241
317
return false;
242
318
}
243
319
244
320
/* Create new GPGME "context" */
245
321
rc = gpgme_new(&(mc.ctx));
246
322
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
249
326
return false;
250
327
}
251
328
270
347
ssize_t plaintext_length = 0;
271
348
272
349
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
351
}
275
352
276
353
/* Create new GPGME data buffer from memory cryptotext */
277
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
355
0);
279
356
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));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
282
359
return -1;
283
360
}
284
361
285
362
/* Create new empty GPGME data buffer for the plaintext */
286
363
rc = gpgme_data_new(&dh_plain);
287
364
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
290
368
gpgme_data_release(dh_crypto);
291
369
return -1;
292
370
}
295
373
data buffer */
296
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
375
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
300
378
plaintext_length = -1;
301
379
if(debug){
302
380
gpgme_decrypt_result_t result;
303
381
result = gpgme_op_decrypt_result(mc.ctx);
304
382
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
384
} 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);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
311
389
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
391
}
314
392
gpgme_recipient_t recipient;
315
393
recipient = result->recipients;
316
394
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");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
323
402
recipient = recipient->next;
324
403
}
325
404
}
328
407
}
329
408
330
409
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
411
}
333
412
334
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
415
perror_plus("gpgme_data_seek");
337
416
plaintext_length = -1;
338
417
goto decrypt_end;
339
418
}
341
420
*plaintext = NULL;
342
421
while(true){
343
422
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
346
425
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
350
429
}
351
430
352
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
436
break;
358
437
}
359
438
if(ret < 0){
360
perror("gpgme_data_read");
439
perror_plus("gpgme_data_read");
361
440
plaintext_length = -1;
362
441
goto decrypt_end;
363
442
}
365
444
}
366
445
367
446
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
369
448
for(ssize_t i = 0; i < plaintext_length; i++){
370
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
450
}
393
472
/* GnuTLS log function callback */
394
473
static void debuggnutls(__attribute__((unused)) int level,
395
474
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
397
476
}
398
477
399
478
static int init_gnutls_global(const char *pubkeyfilename,
401
480
int ret;
402
481
403
482
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
484
}
406
485
407
486
ret = gnutls_global_init();
408
487
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
411
490
return -1;
412
491
}
413
492
420
499
}
421
500
422
501
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
503
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));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
430
506
gnutls_global_deinit();
431
507
return -1;
432
508
}
433
509
434
510
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
438
515
}
439
516
440
517
ret = gnutls_certificate_set_openpgp_key_file
441
518
(mc.cred, pubkeyfilename, seckeyfilename,
442
519
GNUTLS_OPENPGP_FMT_BASE64);
443
520
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));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
449
526
goto globalfail;
450
527
}
451
528
452
529
/* GnuTLS server initialization */
453
530
ret = gnutls_dh_params_init(&mc.dh_params);
454
531
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
457
535
goto globalfail;
458
536
}
459
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
538
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
463
541
goto globalfail;
464
542
}
465
543
485
563
}
486
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
565
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
490
569
}
491
570
492
571
{
499
578
}
500
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
580
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));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
505
584
gnutls_deinit(*session);
506
585
return -1;
507
586
}
516
595
}
517
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
597
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
521
600
gnutls_deinit(*session);
522
601
return -1;
523
602
}
553
632
gnutls_session_t session;
554
633
int pf; /* Protocol family */
555
634
635
errno = 0;
636
556
637
if(quit_now){
638
errno = EINTR;
557
639
return -1;
558
640
}
559
641
565
647
pf = PF_INET;
566
648
break;
567
649
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
569
652
return -1;
570
653
}
571
654
575
658
}
576
659
577
660
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
580
663
}
581
664
582
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
666
if(tcp_sd < 0){
584
perror("socket");
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
585
670
goto mandos_end;
586
671
}
587
672
588
673
if(quit_now){
674
errno = EINTR;
589
675
goto mandos_end;
590
676
}
591
677
598
684
ret = inet_pton(af, ip, &to.in.sin_addr);
599
685
}
600
686
if(ret < 0 ){
601
perror("inet_pton");
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
602
690
goto mandos_end;
603
691
}
604
692
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
606
696
goto mandos_end;
607
697
}
608
698
if(af == AF_INET6){
612
702
613
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
705
-Wunreachable-code*/
616
706
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
619
710
goto mandos_end;
620
711
}
621
712
/* Set the network interface number as scope */
628
719
}
629
720
630
721
if(quit_now){
722
errno = EINTR;
631
723
goto mandos_end;
632
724
}
633
725
635
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
728
char interface[IF_NAMESIZE];
637
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
730
perror_plus("if_indextoname");
639
731
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
642
734
}
643
735
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
646
738
}
647
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
655
747
sizeof(addrstr));
656
748
}
657
749
if(pcret == NULL){
658
perror("inet_ntop");
750
perror_plus("inet_ntop");
659
751
} else {
660
752
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
754
}
663
755
}
664
756
}
665
757
666
758
if(quit_now){
759
errno = EINTR;
667
760
goto mandos_end;
668
761
}
669
762
673
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
767
}
675
768
if(ret < 0){
676
perror("connect");
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
677
774
goto mandos_end;
678
775
}
679
776
680
777
if(quit_now){
778
errno = EINTR;
681
779
goto mandos_end;
682
780
}
683
781
686
784
while(true){
687
785
size_t out_size = strlen(out);
688
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
787
out_size - written));
690
788
if(ret == -1){
691
perror("write");
789
int e = errno;
790
perror_plus("write");
791
errno = e;
692
792
goto mandos_end;
693
793
}
694
794
written += (size_t)ret;
704
804
}
705
805
706
806
if(quit_now){
807
errno = EINTR;
707
808
goto mandos_end;
708
809
}
709
810
}
710
811
711
812
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
814
}
714
815
715
816
if(quit_now){
817
errno = EINTR;
716
818
goto mandos_end;
717
819
}
718
820
821
/* Spurious warning from -Wint-to-pointer-cast */
719
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
823
721
824
if(quit_now){
825
errno = EINTR;
722
826
goto mandos_end;
723
827
}
724
828
725
829
do {
726
830
ret = gnutls_handshake(session);
727
831
if(quit_now){
832
errno = EINTR;
728
833
goto mandos_end;
729
834
}
730
835
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
836
732
837
if(ret != GNUTLS_E_SUCCESS){
733
838
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
840
gnutls_perror(ret);
736
841
}
842
errno = EPROTO;
737
843
goto mandos_end;
738
844
}
739
845
740
846
/* Read OpenPGP packet that contains the wanted password */
741
847
742
848
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
745
851
}
746
852
747
853
while(true){
748
854
749
855
if(quit_now){
856
errno = EINTR;
750
857
goto mandos_end;
751
858
}
752
859
753
860
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
861
buffer_capacity);
755
862
if(buffer_capacity == 0){
756
perror("incbuffer");
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
757
866
goto mandos_end;
758
867
}
759
868
760
869
if(quit_now){
870
errno = EINTR;
761
871
goto mandos_end;
762
872
}
763
873
776
886
ret = gnutls_handshake(session);
777
887
778
888
if(quit_now){
889
errno = EINTR;
779
890
goto mandos_end;
780
891
}
781
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
893
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
784
896
gnutls_perror(ret);
897
errno = EPROTO;
785
898
goto mandos_end;
786
899
}
787
900
break;
788
901
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
791
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
792
906
goto mandos_end;
793
907
}
794
908
} else {
797
911
}
798
912
799
913
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
801
915
}
802
916
803
917
if(quit_now){
918
errno = EINTR;
804
919
goto mandos_end;
805
920
}
806
921
807
922
do {
808
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
924
if(quit_now){
925
errno = EINTR;
810
926
goto mandos_end;
811
927
}
812
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
929
814
930
if(buffer_length > 0){
815
931
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
818
933
&decrypted_buffer);
819
934
if(decrypted_buffer_size >= 0){
820
935
821
936
written = 0;
822
937
while(written < (size_t) decrypted_buffer_size){
823
938
if(quit_now){
939
errno = EINTR;
824
940
goto mandos_end;
825
941
}
826
942
828
944
(size_t)decrypted_buffer_size - written,
829
945
stdout);
830
946
if(ret == 0 and ferror(stdout)){
947
int e = errno;
831
948
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
834
951
}
952
errno = e;
835
953
goto mandos_end;
836
954
}
837
955
written += (size_t)ret;
843
961
/* Shutdown procedure */
844
962
845
963
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;
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
857
983
}
858
984
return retval;
859
985
}
884
1010
switch(event){
885
1011
default:
886
1012
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)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
890
1017
break;
891
1018
892
1019
case AVAHI_RESOLVER_FOUND:
894
1021
char ip[AVAHI_ADDRESS_STR_MAX];
895
1022
avahi_address_snprint(ip, sizeof(ip), address);
896
1023
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);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
900
1027
}
901
1028
int ret = start_mandos_communication(ip, port, interface,
902
1029
avahi_proto_to_af(proto));
903
1030
if(ret == 0){
904
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
905
1035
}
906
1036
}
907
1037
}
931
1061
default:
932
1062
case AVAHI_BROWSER_FAILURE:
933
1063
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
936
1066
avahi_simple_poll_quit(mc.simple_poll);
937
1067
return;
938
1068
945
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
1076
name, type, domain, protocol, 0,
947
1077
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
950
1081
break;
951
1082
952
1083
case AVAHI_BROWSER_REMOVE:
955
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1088
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
959
1091
}
960
1092
break;
961
1093
}
962
1094
}
963
1095
964
/* stop main loop after sigterm has been called */
1096
/* Signal handler that stops main loop after SIGTERM */
965
1097
static void handle_sigterm(int sig){
966
1098
if(quit_now){
967
1099
return;
969
1101
quit_now = 1;
970
1102
signal_received = sig;
971
1103
int old_errno = errno;
1104
/* set main loop to exit */
972
1105
if(mc.simple_poll != NULL){
973
1106
avahi_simple_poll_quit(mc.simple_poll);
974
1107
}
975
1108
errno = old_errno;
976
1109
}
977
1110
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1471
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1511
}
1512
978
1513
int main(int argc, char *argv[]){
979
1514
AvahiSServiceBrowser *sb = NULL;
980
1515
int error;
982
1517
intmax_t tmpmax;
983
1518
char *tmp;
984
1519
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1520
const char *interface = "";
986
1521
struct ifreq network;
987
1522
int sd = -1;
988
1523
bool take_down_interface = false;
989
1524
uid_t uid;
990
1525
gid_t gid;
991
char *connect_to = NULL;
992
1526
char tempdir[] = "/tmp/mandosXXXXXX";
993
1527
bool tempdir_created = false;
994
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
998
1532
bool gnutls_initialized = false;
999
1533
bool gpgme_initialized = false;
1000
1534
float delay = 2.5f;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1001
1537
1002
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1539
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1545
errno = 0;
1010
1546
ret = setgid(gid);
1011
1547
if(ret == -1){
1012
perror("setgid");
1548
perror_plus("setgid");
1013
1549
}
1014
1550
1015
1551
/* Lower user privileges (temporarily) */
1016
1552
errno = 0;
1017
1553
ret = seteuid(uid);
1018
1554
if(ret == -1){
1019
perror("seteuid");
1555
perror_plus("seteuid");
1020
1556
}
1021
1557
1022
1558
if(quit_now){
1057
1593
.arg = "SECONDS",
1058
1594
.doc = "Maximum delay to wait for interface startup",
1059
1595
.group = 2 },
1596
{ .name = "retry", .key = 132,
1597
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
1599
.group = 2 },
1600
{ .name = "network-hook-dir", .key = 133,
1601
.arg = "DIR",
1602
.doc = "Directory where network hooks are located",
1603
.group = 2 },
1060
1604
/*
1061
1605
* These reproduce what we would get without ARGP_NO_HELP
1062
1606
*/
1106
1650
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1651
argp_error(state, "Bad delay");
1108
1652
}
1653
case 132: /* --retry */
1654
errno = 0;
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1660
}
1661
break;
1662
case 133: /* --network-hook-dir */
1663
hookdir = arg;
1109
1664
break;
1110
1665
/*
1111
1666
* These reproduce what we would get without ARGP_NO_HELP
1118
1673
argp_state_help(state, state->out_stream,
1119
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
1675
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
1679
exit(argp_err_exit_status);
1123
1680
break;
1124
1681
default:
1139
1696
case ENOMEM:
1140
1697
default:
1141
1698
errno = ret;
1142
perror("argp_parse");
1699
perror_plus("argp_parse");
1143
1700
exitcode = EX_OSERR;
1144
1701
goto end;
1145
1702
case EINVAL:
1147
1704
goto end;
1148
1705
}
1149
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
1718
struct stat st;
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1732
if(ret == -1){
1733
perror_plus("fchown");
1734
}
1735
}
1736
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
}
1739
}
1740
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1745
} else {
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
if(ret == -1){
1748
perror_plus("fstat");
1749
} else {
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1753
if(ret == -1){
1754
perror_plus("fchown");
1755
}
1756
}
1757
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
1762
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
1767
}
1768
}
1769
}
1770
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
1774
}
1150
1775
1151
1776
if(not debug){
1152
1777
avahi_set_log_function(empty_log);
1153
1778
}
1154
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1155
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1813
from the signal handler */
1157
1814
/* Initialize the pseudo-RNG for Avahi */
1158
1815
srand((unsigned int) time(NULL));
1159
1816
mc.simple_poll = avahi_simple_poll_new();
1160
1817
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1163
1821
goto end;
1164
1822
}
1165
1823
1166
1824
sigemptyset(&sigterm_action.sa_mask);
1167
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
1826
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1171
1829
goto end;
1172
1830
}
1173
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
1832
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1177
1835
goto end;
1178
1836
}
1179
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
1838
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1183
1841
goto end;
1184
1842
}
1185
1843
/* Need to check if the handler is SIG_IGN before handling:
1188
1846
*/
1189
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
1848
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1193
1851
}
1194
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
1854
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1199
1857
goto end;
1200
1858
}
1201
1859
}
1202
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
1861
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1206
1864
}
1207
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
1867
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1212
1870
goto end;
1213
1871
}
1214
1872
}
1215
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
1874
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1219
1877
}
1220
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
1880
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1225
1883
goto end;
1226
1884
}
1227
1885
}
1228
1886
1229
1887
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1888
if(strcmp(interface, "none") != 0){
1231
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1890
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1235
1893
goto end;
1236
1894
}
1237
1895
1243
1901
errno = 0;
1244
1902
ret = seteuid(0);
1245
1903
if(ret == -1){
1246
perror("seteuid");
1904
perror_plus("seteuid");
1247
1905
}
1248
1906
1249
1907
#ifdef __linux__
1253
1911
bool restore_loglevel = true;
1254
1912
if(ret == -1){
1255
1913
restore_loglevel = false;
1256
perror("klogctl");
1914
perror_plus("klogctl");
1257
1915
}
1258
1916
#endif /* __linux__ */
1259
1917
1260
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
1919
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1264
1922
#ifdef __linux__
1265
1923
if(restore_loglevel){
1266
1924
ret = klogctl(7, NULL, 0);
1267
1925
if(ret == -1){
1268
perror("klogctl");
1926
perror_plus("klogctl");
1269
1927
}
1270
1928
}
1271
1929
#endif /* __linux__ */
1273
1931
errno = 0;
1274
1932
ret = seteuid(uid);
1275
1933
if(ret == -1){
1276
perror("seteuid");
1934
perror_plus("seteuid");
1277
1935
}
1278
1936
goto end;
1279
1937
}
1280
1938
strcpy(network.ifr_name, interface);
1281
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
1940
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1941
perror_plus("ioctl SIOCGIFFLAGS");
1284
1942
#ifdef __linux__
1285
1943
if(restore_loglevel){
1286
1944
ret = klogctl(7, NULL, 0);
1287
1945
if(ret == -1){
1288
perror("klogctl");
1946
perror_plus("klogctl");
1289
1947
}
1290
1948
}
1291
1949
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1950
exitcode = EX_OSERR;
1293
1951
/* Lower privileges */
1294
1952
errno = 0;
1295
1953
ret = seteuid(uid);
1296
1954
if(ret == -1){
1297
perror("seteuid");
1955
perror_plus("seteuid");
1298
1956
}
1299
1957
goto end;
1300
1958
}
1304
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
1963
if(ret == -1){
1306
1964
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1309
1967
#ifdef __linux__
1310
1968
if(restore_loglevel){
1311
1969
ret = klogctl(7, NULL, 0);
1312
1970
if(ret == -1){
1313
perror("klogctl");
1971
perror_plus("klogctl");
1314
1972
}
1315
1973
}
1316
1974
#endif /* __linux__ */
1318
1976
errno = 0;
1319
1977
ret = seteuid(uid);
1320
1978
if(ret == -1){
1321
perror("seteuid");
1979
perror_plus("seteuid");
1322
1980
}
1323
1981
goto end;
1324
1982
}
1325
1983
}
1326
/* sleep checking until interface is running */
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1327
1986
for(int i=0; i < delay * 4; i++){
1328
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
1988
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1989
perror_plus("ioctl SIOCGIFFLAGS");
1331
1990
} else if(network.ifr_flags & IFF_RUNNING){
1332
1991
break;
1333
1992
}
1334
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
1994
ret = nanosleep(&sleeptime, NULL);
1336
1995
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1996
perror_plus("nanosleep");
1338
1997
}
1339
1998
}
1340
1999
if(not take_down_interface){
1341
2000
/* We won't need the socket anymore */
1342
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
2002
if(ret == -1){
1344
perror("close");
2003
perror_plus("close");
1345
2004
}
1346
2005
}
1347
2006
#ifdef __linux__
1349
2008
/* Restores kernel loglevel to default */
1350
2009
ret = klogctl(7, NULL, 0);
1351
2010
if(ret == -1){
1352
perror("klogctl");
2011
perror_plus("klogctl");
1353
2012
}
1354
2013
}
1355
2014
#endif /* __linux__ */
1356
2015
/* Lower privileges */
1357
2016
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
}
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
1370
2021
}
1371
2022
}
1372
2023
1376
2027
1377
2028
ret = init_gnutls_global(pubkey, seckey);
1378
2029
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
1381
2032
goto end;
1382
2033
} else {
1383
2034
gnutls_initialized = true;
1387
2038
goto end;
1388
2039
}
1389
2040
2041
if(mkdtemp(tempdir) == NULL){
2042
perror_plus("mkdtemp");
2043
goto end;
2044
}
1390
2045
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
2046
1397
2047
if(quit_now){
1398
2048
goto end;
1399
2049
}
1400
2050
1401
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
1404
2054
goto end;
1405
2055
} else {
1406
2056
gpgme_initialized = true;
1415
2065
/* (Mainly meant for debugging) */
1416
2066
char *address = strrchr(connect_to, ':');
1417
2067
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
1420
2070
goto end;
1421
2071
}
1422
2072
1429
2079
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
2081
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
1434
2084
goto end;
1435
2085
}
1436
2086
1440
2090
1441
2091
port = (uint16_t)tmpmax;
1442
2092
*address = '\0';
1443
address = connect_to;
1444
2093
/* Colon in address indicates IPv6 */
1445
2094
int af;
1446
if(strchr(address, ':') != NULL){
2095
if(strchr(connect_to, ':') != NULL){
1447
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
1448
2103
} else {
1449
2104
af = AF_INET;
1450
2105
}
2106
address = connect_to;
1451
2107
1452
2108
if(quit_now){
1453
2109
goto end;
1454
2110
}
1455
2111
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1460
2125
exitcode = EXIT_SUCCESS;
1461
2126
}
2127
1462
2128
goto end;
1463
2129
}
1464
2130
1486
2152
1487
2153
/* Check if creating the Avahi server object succeeded */
1488
2154
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
1492
2158
goto end;
1493
2159
}
1494
2160
1501
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
2168
NULL, 0, browse_callback, NULL);
1503
2169
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;
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
1507
2173
goto end;
1508
2174
}
1509
2175
1514
2180
/* Run the main loop */
1515
2181
1516
2182
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2188
if(debug){
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
2191
}
1521
2192
1522
2193
end:
1523
2194
1524
2195
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2197
}
1527
2198
1528
2199
/* Cleanup things */
1545
2216
gpgme_release(mc.ctx);
1546
2217
}
1547
2218
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2219
/* Cleans up the circular linked list of Mandos servers the client
2220
has seen */
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2234
{
1551
2235
errno = 0;
1552
2236
ret = seteuid(0);
1553
2237
if(ret == -1){
1554
perror("seteuid");
2238
perror_plus("seteuid");
1555
2239
}
1556
if(geteuid() == 0){
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
1557
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
2244
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
1561
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
2249
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1565
2251
}
1566
2252
}
1567
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
2254
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");
2255
perror_plus("close");
1576
2256
}
1577
2257
}
1578
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
1579
2265
1580
/* Removes the temp directory used by GPGME */
2266
/* Removes the GPGME temp directory and all files inside */
1581
2267
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
}
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
1602
2275
char *fullname = NULL;
1603
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2277
direntry->d_name);
1605
2278
if(ret < 0){
1606
perror("asprintf");
2279
perror_plus("asprintf");
1607
2280
continue;
1608
2281
}
1609
2282
ret = remove(fullname);
1610
2283
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
1613
2286
}
1614
2287
free(fullname);
1615
2288
}
1616
closedir(d);
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
1617
2295
}
1618
2296
ret = rmdir(tempdir);
1619
2297
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2298
perror_plus("rmdir");
1621
2299
}
1622
2300
}
1623
2301
1628
2306
&old_sigterm_action,
1629
2307
NULL));
1630
2308
if(ret == -1){
1631
perror("sigaction");
2309
perror_plus("sigaction");
1632
2310
}
1633
2311
do {
1634
2312
ret = raise(signal_received);
1635
2313
} while(ret != 0 and errno == EINTR);
1636
2314
if(ret != 0){
1637
perror("raise");
2315
perror_plus("raise");
1638
2316
abort();
1639
2317
}
1640
2318
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0