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- Committer: Teddy Hogeborn
- Date: 2012-05-24 18:10:10 UTC
- Revision ID: teddy@recompile.se-20120524181010-cg4zcc6e5igbanbc
* Makefile (DOCBOOKTOMAN): Only run man --warnings if both "man" and
the en_US.utf8 locale exists.
* debian/control (Build-Depends): Removed "man, locales-all".
(Standards-Version): Updated to "3.9.3".
* debian/copyright (Format): Updated to
"http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/".
* mandos (PGPEngine.__exit__, datetime_to_dbus): White space fixes.
(alternate_dbus_interfaces): Doc string fix.
the en_US.utf8 locale exists.
* debian/control (Build-Depends): Removed "man, locales-all".
(Standards-Version): Updated to "3.9.3".
* debian/copyright (Format): Updated to
"http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/".
* mandos (PGPEngine.__exit__, datetime_to_dbus): White space fixes.
(alternate_dbus_interfaces): Doc string fix.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
149
190
/*
150
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
192
* bytes. "buffer_capacity" is how much is currently allocated,
152
193
* "buffer_length" is how much is already used.
153
194
*/
154
195
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
196
size_t buffer_capacity){
156
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
199
if(buffer == NULL){
163
204
return buffer_capacity;
164
205
}
165
206
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
166
244
/*
167
245
* Initialize GPGME.
168
246
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
171
249
gpgme_error_t rc;
172
250
gpgme_engine_info_t engine_info;
173
251
182
260
183
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
262
if(fd == -1){
185
perror("open");
263
perror_plus("open");
186
264
return false;
187
265
}
188
266
189
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
268
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));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
193
271
return false;
194
272
}
195
273
196
274
rc = gpgme_op_import(mc.ctx, pgp_data);
197
275
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
200
278
return false;
201
279
}
202
280
203
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
282
if(ret == -1){
205
perror("close");
283
perror_plus("close");
206
284
}
207
285
gpgme_data_release(pgp_data);
208
286
return true;
209
287
}
210
288
211
289
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
213
291
}
214
292
215
293
/* Init GPGME */
216
294
gpgme_check_version(NULL);
217
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
296
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
221
299
return false;
222
300
}
223
301
224
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
225
303
rc = gpgme_get_engine_info(&engine_info);
226
304
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
229
307
return false;
230
308
}
231
309
while(engine_info != NULL){
237
315
engine_info = engine_info->next;
238
316
}
239
317
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
241
320
return false;
242
321
}
243
322
244
323
/* Create new GPGME "context" */
245
324
rc = gpgme_new(&(mc.ctx));
246
325
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
249
329
return false;
250
330
}
251
331
270
350
ssize_t plaintext_length = 0;
271
351
272
352
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
354
}
275
355
276
356
/* Create new GPGME data buffer from memory cryptotext */
277
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
358
0);
279
359
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));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
282
362
return -1;
283
363
}
284
364
285
365
/* Create new empty GPGME data buffer for the plaintext */
286
366
rc = gpgme_data_new(&dh_plain);
287
367
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
290
371
gpgme_data_release(dh_crypto);
291
372
return -1;
292
373
}
295
376
data buffer */
296
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
378
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
300
381
plaintext_length = -1;
301
382
if(debug){
302
383
gpgme_decrypt_result_t result;
303
384
result = gpgme_op_decrypt_result(mc.ctx);
304
385
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
387
} 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);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
311
392
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
394
}
314
395
gpgme_recipient_t recipient;
315
396
recipient = result->recipients;
316
397
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");
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
323
405
recipient = recipient->next;
324
406
}
325
407
}
328
410
}
329
411
330
412
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
414
}
333
415
334
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
418
perror_plus("gpgme_data_seek");
337
419
plaintext_length = -1;
338
420
goto decrypt_end;
339
421
}
341
423
*plaintext = NULL;
342
424
while(true){
343
425
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
346
428
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
350
432
}
351
433
352
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
439
break;
358
440
}
359
441
if(ret < 0){
360
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
361
443
plaintext_length = -1;
362
444
goto decrypt_end;
363
445
}
365
447
}
366
448
367
449
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
369
451
for(ssize_t i = 0; i < plaintext_length; i++){
370
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
453
}
393
475
/* GnuTLS log function callback */
394
476
static void debuggnutls(__attribute__((unused)) int level,
395
477
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
397
479
}
398
480
399
481
static int init_gnutls_global(const char *pubkeyfilename,
401
483
int ret;
402
484
403
485
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
487
}
406
488
407
489
ret = gnutls_global_init();
408
490
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
411
493
return -1;
412
494
}
413
495
420
502
}
421
503
422
504
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
506
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));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
430
509
gnutls_global_deinit();
431
510
return -1;
432
511
}
433
512
434
513
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
438
518
}
439
519
440
520
ret = gnutls_certificate_set_openpgp_key_file
441
521
(mc.cred, pubkeyfilename, seckeyfilename,
442
522
GNUTLS_OPENPGP_FMT_BASE64);
443
523
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));
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
449
529
goto globalfail;
450
530
}
451
531
452
532
/* GnuTLS server initialization */
453
533
ret = gnutls_dh_params_init(&mc.dh_params);
454
534
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
457
538
goto globalfail;
458
539
}
459
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
541
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
463
544
goto globalfail;
464
545
}
465
546
485
566
}
486
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
568
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
490
572
}
491
573
492
574
{
499
581
}
500
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
583
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));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
505
587
gnutls_deinit(*session);
506
588
return -1;
507
589
}
516
598
}
517
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
600
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
521
603
gnutls_deinit(*session);
522
604
return -1;
523
605
}
553
635
gnutls_session_t session;
554
636
int pf; /* Protocol family */
555
637
638
errno = 0;
639
556
640
if(quit_now){
641
errno = EINTR;
557
642
return -1;
558
643
}
559
644
565
650
pf = PF_INET;
566
651
break;
567
652
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
569
655
return -1;
570
656
}
571
657
575
661
}
576
662
577
663
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
580
666
}
581
667
582
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
669
if(tcp_sd < 0){
584
perror("socket");
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
585
673
goto mandos_end;
586
674
}
587
675
588
676
if(quit_now){
677
errno = EINTR;
589
678
goto mandos_end;
590
679
}
591
680
598
687
ret = inet_pton(af, ip, &to.in.sin_addr);
599
688
}
600
689
if(ret < 0 ){
601
perror("inet_pton");
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
602
693
goto mandos_end;
603
694
}
604
695
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
606
699
goto mandos_end;
607
700
}
608
701
if(af == AF_INET6){
612
705
613
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
708
-Wunreachable-code*/
616
709
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
619
713
goto mandos_end;
620
714
}
621
715
/* Set the network interface number as scope */
628
722
}
629
723
630
724
if(quit_now){
725
errno = EINTR;
631
726
goto mandos_end;
632
727
}
633
728
635
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
731
char interface[IF_NAMESIZE];
637
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
733
perror_plus("if_indextoname");
639
734
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
642
737
}
643
738
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
646
741
}
647
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
655
750
sizeof(addrstr));
656
751
}
657
752
if(pcret == NULL){
658
perror("inet_ntop");
753
perror_plus("inet_ntop");
659
754
} else {
660
755
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
757
}
663
758
}
664
759
}
665
760
666
761
if(quit_now){
762
errno = EINTR;
667
763
goto mandos_end;
668
764
}
669
765
673
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
770
}
675
771
if(ret < 0){
676
perror("connect");
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
677
777
goto mandos_end;
678
778
}
679
779
680
780
if(quit_now){
781
errno = EINTR;
681
782
goto mandos_end;
682
783
}
683
784
686
787
while(true){
687
788
size_t out_size = strlen(out);
688
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
790
out_size - written));
690
791
if(ret == -1){
691
perror("write");
792
int e = errno;
793
perror_plus("write");
794
errno = e;
692
795
goto mandos_end;
693
796
}
694
797
written += (size_t)ret;
704
807
}
705
808
706
809
if(quit_now){
810
errno = EINTR;
707
811
goto mandos_end;
708
812
}
709
813
}
710
814
711
815
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
817
}
714
818
715
819
if(quit_now){
820
errno = EINTR;
716
821
goto mandos_end;
717
822
}
718
823
824
/* Spurious warning from -Wint-to-pointer-cast */
719
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
826
721
827
if(quit_now){
828
errno = EINTR;
722
829
goto mandos_end;
723
830
}
724
831
725
832
do {
726
833
ret = gnutls_handshake(session);
727
834
if(quit_now){
835
errno = EINTR;
728
836
goto mandos_end;
729
837
}
730
838
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
839
732
840
if(ret != GNUTLS_E_SUCCESS){
733
841
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
843
gnutls_perror(ret);
736
844
}
845
errno = EPROTO;
737
846
goto mandos_end;
738
847
}
739
848
740
849
/* Read OpenPGP packet that contains the wanted password */
741
850
742
851
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
745
854
}
746
855
747
856
while(true){
748
857
749
858
if(quit_now){
859
errno = EINTR;
750
860
goto mandos_end;
751
861
}
752
862
753
863
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
864
buffer_capacity);
755
865
if(buffer_capacity == 0){
756
perror("incbuffer");
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
757
869
goto mandos_end;
758
870
}
759
871
760
872
if(quit_now){
873
errno = EINTR;
761
874
goto mandos_end;
762
875
}
763
876
776
889
ret = gnutls_handshake(session);
777
890
778
891
if(quit_now){
892
errno = EINTR;
779
893
goto mandos_end;
780
894
}
781
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
896
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
784
899
gnutls_perror(ret);
900
errno = EPROTO;
785
901
goto mandos_end;
786
902
}
787
903
break;
788
904
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
791
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
792
909
goto mandos_end;
793
910
}
794
911
} else {
797
914
}
798
915
799
916
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
917
fprintf_plus(stderr, "Closing TLS session\n");
801
918
}
802
919
803
920
if(quit_now){
921
errno = EINTR;
804
922
goto mandos_end;
805
923
}
806
924
807
925
do {
808
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
927
if(quit_now){
928
errno = EINTR;
810
929
goto mandos_end;
811
930
}
812
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
932
814
933
if(buffer_length > 0){
815
934
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
818
936
&decrypted_buffer);
819
937
if(decrypted_buffer_size >= 0){
820
938
821
939
written = 0;
822
940
while(written < (size_t) decrypted_buffer_size){
823
941
if(quit_now){
942
errno = EINTR;
824
943
goto mandos_end;
825
944
}
826
945
828
947
(size_t)decrypted_buffer_size - written,
829
948
stdout);
830
949
if(ret == 0 and ferror(stdout)){
950
int e = errno;
831
951
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
834
954
}
955
errno = e;
835
956
goto mandos_end;
836
957
}
837
958
written += (size_t)ret;
843
964
/* Shutdown procedure */
844
965
845
966
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;
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
984
retval = -1;
985
}
857
986
}
858
987
return retval;
859
988
}
884
1013
switch(event){
885
1014
default:
886
1015
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)));
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
890
1020
break;
891
1021
892
1022
case AVAHI_RESOLVER_FOUND:
894
1024
char ip[AVAHI_ADDRESS_STR_MAX];
895
1025
avahi_address_snprint(ip, sizeof(ip), address);
896
1026
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);
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
900
1030
}
901
1031
int ret = start_mandos_communication(ip, port, interface,
902
1032
avahi_proto_to_af(proto));
903
1033
if(ret == 0){
904
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
905
1041
}
906
1042
}
907
1043
}
931
1067
default:
932
1068
case AVAHI_BROWSER_FAILURE:
933
1069
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
936
1072
avahi_simple_poll_quit(mc.simple_poll);
937
1073
return;
938
1074
945
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
1082
name, type, domain, protocol, 0,
947
1083
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
950
1087
break;
951
1088
952
1089
case AVAHI_BROWSER_REMOVE:
955
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1094
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
959
1097
}
960
1098
break;
961
1099
}
962
1100
}
963
1101
964
/* stop main loop after sigterm has been called */
1102
/* Signal handler that stops main loop after SIGTERM */
965
1103
static void handle_sigterm(int sig){
966
1104
if(quit_now){
967
1105
return;
969
1107
quit_now = 1;
970
1108
signal_received = sig;
971
1109
int old_errno = errno;
1110
/* set main loop to exit */
972
1111
if(mc.simple_poll != NULL){
973
1112
avahi_simple_poll_quit(mc.simple_poll);
974
1113
}
975
1114
errno = old_errno;
976
1115
}
977
1116
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
978
1526
int main(int argc, char *argv[]){
979
1527
AvahiSServiceBrowser *sb = NULL;
980
1528
int error;
982
1530
intmax_t tmpmax;
983
1531
char *tmp;
984
1532
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1533
const char *interface = "";
986
1534
struct ifreq network;
987
1535
int sd = -1;
988
1536
bool take_down_interface = false;
989
1537
uid_t uid;
990
1538
gid_t gid;
991
char *connect_to = NULL;
992
1539
char tempdir[] = "/tmp/mandosXXXXXX";
993
1540
bool tempdir_created = false;
994
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
998
1545
bool gnutls_initialized = false;
999
1546
bool gpgme_initialized = false;
1000
1547
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1001
1550
1002
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1552
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1558
errno = 0;
1010
1559
ret = setgid(gid);
1011
1560
if(ret == -1){
1012
perror("setgid");
1561
perror_plus("setgid");
1013
1562
}
1014
1563
1015
1564
/* Lower user privileges (temporarily) */
1016
1565
errno = 0;
1017
1566
ret = seteuid(uid);
1018
1567
if(ret == -1){
1019
perror("seteuid");
1568
perror_plus("seteuid");
1020
1569
}
1021
1570
1022
1571
if(quit_now){
1057
1606
.arg = "SECONDS",
1058
1607
.doc = "Maximum delay to wait for interface startup",
1059
1608
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1060
1617
/*
1061
1618
* These reproduce what we would get without ARGP_NO_HELP
1062
1619
*/
1106
1663
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1664
argp_error(state, "Bad delay");
1108
1665
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1109
1677
break;
1110
1678
/*
1111
1679
* These reproduce what we would get without ARGP_NO_HELP
1118
1686
argp_state_help(state, state->out_stream,
1119
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
1688
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
1690
exit(argp_err_exit_status);
1123
1691
break;
1124
1692
default:
1139
1707
case ENOMEM:
1140
1708
default:
1141
1709
errno = ret;
1142
perror("argp_parse");
1710
perror_plus("argp_parse");
1143
1711
exitcode = EX_OSERR;
1144
1712
goto end;
1145
1713
case EINVAL:
1147
1715
goto end;
1148
1716
}
1149
1717
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1785
}
1150
1786
1151
1787
if(not debug){
1152
1788
avahi_set_log_function(empty_log);
1153
1789
}
1154
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1155
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1824
from the signal handler */
1157
1825
/* Initialize the pseudo-RNG for Avahi */
1158
1826
srand((unsigned int) time(NULL));
1159
1827
mc.simple_poll = avahi_simple_poll_new();
1160
1828
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1831
exitcode = EX_UNAVAILABLE;
1163
1832
goto end;
1164
1833
}
1165
1834
1166
1835
sigemptyset(&sigterm_action.sa_mask);
1167
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
1837
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1171
1840
goto end;
1172
1841
}
1173
1842
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
1843
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1844
perror_plus("sigaddset");
1845
exitcode = EX_OSERR;
1177
1846
goto end;
1178
1847
}
1179
1848
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
1849
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1850
perror_plus("sigaddset");
1851
exitcode = EX_OSERR;
1183
1852
goto end;
1184
1853
}
1185
1854
/* Need to check if the handler is SIG_IGN before handling:
1188
1857
*/
1189
1858
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
1859
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1193
1862
}
1194
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1864
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
1865
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1199
1868
goto end;
1200
1869
}
1201
1870
}
1202
1871
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
1872
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1206
1875
}
1207
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1877
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
1878
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1212
1881
goto end;
1213
1882
}
1214
1883
}
1215
1884
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
1885
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1886
perror_plus("sigaction");
1887
return EX_OSERR;
1219
1888
}
1220
1889
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1890
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
1891
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1892
perror_plus("sigaction");
1893
exitcode = EX_OSERR;
1225
1894
goto end;
1226
1895
}
1227
1896
}
1228
1897
1229
1898
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1899
if(strcmp(interface, "none") != 0){
1231
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1901
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1235
1904
goto end;
1236
1905
}
1237
1906
1243
1912
errno = 0;
1244
1913
ret = seteuid(0);
1245
1914
if(ret == -1){
1246
perror("seteuid");
1915
perror_plus("seteuid");
1247
1916
}
1248
1917
1249
1918
#ifdef __linux__
1253
1922
bool restore_loglevel = true;
1254
1923
if(ret == -1){
1255
1924
restore_loglevel = false;
1256
perror("klogctl");
1925
perror_plus("klogctl");
1257
1926
}
1258
1927
#endif /* __linux__ */
1259
1928
1260
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
1930
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1264
1933
#ifdef __linux__
1265
1934
if(restore_loglevel){
1266
1935
ret = klogctl(7, NULL, 0);
1267
1936
if(ret == -1){
1268
perror("klogctl");
1937
perror_plus("klogctl");
1269
1938
}
1270
1939
}
1271
1940
#endif /* __linux__ */
1273
1942
errno = 0;
1274
1943
ret = seteuid(uid);
1275
1944
if(ret == -1){
1276
perror("seteuid");
1945
perror_plus("seteuid");
1277
1946
}
1278
1947
goto end;
1279
1948
}
1280
1949
strcpy(network.ifr_name, interface);
1281
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
1951
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1952
perror_plus("ioctl SIOCGIFFLAGS");
1284
1953
#ifdef __linux__
1285
1954
if(restore_loglevel){
1286
1955
ret = klogctl(7, NULL, 0);
1287
1956
if(ret == -1){
1288
perror("klogctl");
1957
perror_plus("klogctl");
1289
1958
}
1290
1959
}
1291
1960
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1961
exitcode = EX_OSERR;
1293
1962
/* Lower privileges */
1294
1963
errno = 0;
1295
1964
ret = seteuid(uid);
1296
1965
if(ret == -1){
1297
perror("seteuid");
1966
perror_plus("seteuid");
1298
1967
}
1299
1968
goto end;
1300
1969
}
1304
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
1974
if(ret == -1){
1306
1975
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1309
1978
#ifdef __linux__
1310
1979
if(restore_loglevel){
1311
1980
ret = klogctl(7, NULL, 0);
1312
1981
if(ret == -1){
1313
perror("klogctl");
1982
perror_plus("klogctl");
1314
1983
}
1315
1984
}
1316
1985
#endif /* __linux__ */
1318
1987
errno = 0;
1319
1988
ret = seteuid(uid);
1320
1989
if(ret == -1){
1321
perror("seteuid");
1990
perror_plus("seteuid");
1322
1991
}
1323
1992
goto end;
1324
1993
}
1325
1994
}
1326
/* sleep checking until interface is running */
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1327
1997
for(int i=0; i < delay * 4; i++){
1328
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
1999
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
2000
perror_plus("ioctl SIOCGIFFLAGS");
1331
2001
} else if(network.ifr_flags & IFF_RUNNING){
1332
2002
break;
1333
2003
}
1334
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
2005
ret = nanosleep(&sleeptime, NULL);
1336
2006
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
2007
perror_plus("nanosleep");
1338
2008
}
1339
2009
}
1340
2010
if(not take_down_interface){
1341
2011
/* We won't need the socket anymore */
1342
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
2013
if(ret == -1){
1344
perror("close");
2014
perror_plus("close");
1345
2015
}
1346
2016
}
1347
2017
#ifdef __linux__
1349
2019
/* Restores kernel loglevel to default */
1350
2020
ret = klogctl(7, NULL, 0);
1351
2021
if(ret == -1){
1352
perror("klogctl");
2022
perror_plus("klogctl");
1353
2023
}
1354
2024
}
1355
2025
#endif /* __linux__ */
1356
2026
/* Lower privileges */
1357
2027
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
}
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1370
2032
}
1371
2033
}
1372
2034
1376
2038
1377
2039
ret = init_gnutls_global(pubkey, seckey);
1378
2040
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
exitcode = EX_UNAVAILABLE;
1381
2043
goto end;
1382
2044
} else {
1383
2045
gnutls_initialized = true;
1387
2049
goto end;
1388
2050
}
1389
2051
2052
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
2054
goto end;
2055
}
1390
2056
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
2057
1397
2058
if(quit_now){
1398
2059
goto end;
1399
2060
}
1400
2061
1401
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1404
2065
goto end;
1405
2066
} else {
1406
2067
gpgme_initialized = true;
1415
2076
/* (Mainly meant for debugging) */
1416
2077
char *address = strrchr(connect_to, ':');
1417
2078
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2079
fprintf_plus(stderr, "No colon in address\n");
2080
exitcode = EX_USAGE;
1420
2081
goto end;
1421
2082
}
1422
2083
1429
2090
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
2092
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2093
fprintf_plus(stderr, "Bad port number\n");
2094
exitcode = EX_USAGE;
1434
2095
goto end;
1435
2096
}
1436
2097
1440
2101
1441
2102
port = (uint16_t)tmpmax;
1442
2103
*address = '\0';
1443
address = connect_to;
1444
2104
/* Colon in address indicates IPv6 */
1445
2105
int af;
1446
if(strchr(address, ':') != NULL){
2106
if(strchr(connect_to, ':') != NULL){
1447
2107
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
1448
2114
} else {
1449
2115
af = AF_INET;
1450
2116
}
2117
address = connect_to;
1451
2118
1452
2119
if(quit_now){
1453
2120
goto end;
1454
2121
}
1455
2122
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
if (not quit_now){
1460
2136
exitcode = EXIT_SUCCESS;
1461
2137
}
2138
1462
2139
goto end;
1463
2140
}
1464
2141
1486
2163
1487
2164
/* Check if creating the Avahi server object succeeded */
1488
2165
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2168
exitcode = EX_UNAVAILABLE;
1492
2169
goto end;
1493
2170
}
1494
2171
1501
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
2179
NULL, 0, browse_callback, NULL);
1503
2180
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;
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2183
exitcode = EX_UNAVAILABLE;
1507
2184
goto end;
1508
2185
}
1509
2186
1514
2191
/* Run the main loop */
1515
2192
1516
2193
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
1521
2203
1522
2204
end:
1523
2205
1524
2206
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2208
}
1527
2209
1528
2210
/* Cleanup things */
1545
2227
gpgme_release(mc.ctx);
1546
2228
}
1547
2229
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1551
2246
errno = 0;
1552
2247
ret = seteuid(0);
1553
2248
if(ret == -1){
1554
perror("seteuid");
2249
perror_plus("seteuid");
1555
2250
}
1556
if(geteuid() == 0){
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1557
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
2255
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
1561
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
2260
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1565
2262
}
1566
2263
}
1567
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
2265
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");
2266
perror_plus("close");
1576
2267
}
1577
2268
}
1578
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
1579
2276
1580
/* Removes the temp directory used by GPGME */
2277
/* Removes the GPGME temp directory and all files inside */
1581
2278
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
}
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
1602
2286
char *fullname = NULL;
1603
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2288
direntry->d_name);
1605
2289
if(ret < 0){
1606
perror("asprintf");
2290
perror_plus("asprintf");
1607
2291
continue;
1608
2292
}
1609
2293
ret = remove(fullname);
1610
2294
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
1613
2297
}
1614
2298
free(fullname);
1615
2299
}
1616
closedir(d);
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
1617
2306
}
1618
2307
ret = rmdir(tempdir);
1619
2308
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2309
perror_plus("rmdir");
1621
2310
}
1622
2311
}
1623
2312
1628
2317
&old_sigterm_action,
1629
2318
NULL));
1630
2319
if(ret == -1){
1631
perror("sigaction");
2320
perror_plus("sigaction");
1632
2321
}
1633
2322
do {
1634
2323
ret = raise(signal_received);
1635
2324
} while(ret != 0 and errno == EINTR);
1636
2325
if(ret != 0){
1637
perror("raise");
2326
perror_plus("raise");
1638
2327
abort();
1639
2328
}
1640
2329
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0