(root)/mandos/release
» Revision
237.7.138
(compared to revision 237.2.170)
: plugins.d/mandos-client.c
To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.7.138
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.138
- Committer: Teddy Hogeborn
- Date: 2012-05-26 22:48:45 UTC
- mto: (300.1.1 release) (237.7.144 trunk) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 301.
- Revision ID: teddy@recompile.se-20120526224845-imaxtrlh3j3yu1ga
* mandos: Change comment.
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
- 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
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,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
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;
130
149
131
150
/* Used for passing in values through the Avahi callback functions */
132
151
typedef struct {
137
156
gnutls_dh_params_t dh_params;
138
157
const char *priority;
139
158
gpgme_ctx_t ctx;
159
server *current_server;
140
160
} mandos_context;
141
161
142
162
/* global context so signal handler can reach it*/
143
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
164
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
146
167
147
168
sig_atomic_t quit_now = 0;
148
169
int signal_received = 0;
149
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
150
190
/*
151
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
192
* bytes. "buffer_capacity" is how much is currently allocated,
153
193
* "buffer_length" is how much is already used.
154
194
*/
155
195
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
196
size_t buffer_capacity){
157
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
199
if(buffer == NULL){
164
204
return buffer_capacity;
165
205
}
166
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
167
244
/*
168
245
* Initialize GPGME.
169
246
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
172
249
gpgme_error_t rc;
173
250
gpgme_engine_info_t engine_info;
174
251
183
260
184
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
262
if(fd == -1){
186
perror("open");
263
perror_plus("open");
187
264
return false;
188
265
}
189
266
190
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
268
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
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));
194
271
return false;
195
272
}
196
273
197
274
rc = gpgme_op_import(mc.ctx, pgp_data);
198
275
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
201
278
return false;
202
279
}
203
280
204
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
282
if(ret == -1){
206
perror("close");
283
perror_plus("close");
207
284
}
208
285
gpgme_data_release(pgp_data);
209
286
return true;
210
287
}
211
288
212
289
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
214
291
}
215
292
216
293
/* Init GPGME */
217
294
gpgme_check_version(NULL);
218
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
296
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
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));
222
299
return false;
223
300
}
224
301
225
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
226
303
rc = gpgme_get_engine_info(&engine_info);
227
304
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
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));
230
307
return false;
231
308
}
232
309
while(engine_info != NULL){
238
315
engine_info = engine_info->next;
239
316
}
240
317
if(engine_info == NULL){
241
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);
242
320
return false;
243
321
}
244
322
245
323
/* Create new GPGME "context" */
246
324
rc = gpgme_new(&(mc.ctx));
247
325
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
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));
250
329
return false;
251
330
}
252
331
271
350
ssize_t plaintext_length = 0;
272
351
273
352
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
354
}
276
355
277
356
/* Create new GPGME data buffer from memory cryptotext */
278
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
358
0);
280
359
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
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));
283
362
return -1;
284
363
}
285
364
286
365
/* Create new empty GPGME data buffer for the plaintext */
287
366
rc = gpgme_data_new(&dh_plain);
288
367
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
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));
291
371
gpgme_data_release(dh_crypto);
292
372
return -1;
293
373
}
296
376
data buffer */
297
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
378
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
301
381
plaintext_length = -1;
302
382
if(debug){
303
383
gpgme_decrypt_result_t result;
304
384
result = gpgme_op_decrypt_result(mc.ctx);
305
385
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
387
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
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);
312
392
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
394
}
315
395
gpgme_recipient_t recipient;
316
396
recipient = result->recipients;
317
397
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "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");
324
405
recipient = recipient->next;
325
406
}
326
407
}
329
410
}
330
411
331
412
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
414
}
334
415
335
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
418
perror_plus("gpgme_data_seek");
338
419
plaintext_length = -1;
339
420
goto decrypt_end;
340
421
}
342
423
*plaintext = NULL;
343
424
while(true){
344
425
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
347
428
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
351
432
}
352
433
353
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
439
break;
359
440
}
360
441
if(ret < 0){
361
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
362
443
plaintext_length = -1;
363
444
goto decrypt_end;
364
445
}
366
447
}
367
448
368
449
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
370
451
for(ssize_t i = 0; i < plaintext_length; i++){
371
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
453
}
394
475
/* GnuTLS log function callback */
395
476
static void debuggnutls(__attribute__((unused)) int level,
396
477
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
398
479
}
399
480
400
481
static int init_gnutls_global(const char *pubkeyfilename,
402
483
int ret;
403
484
404
485
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
487
}
407
488
408
489
ret = gnutls_global_init();
409
490
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
412
493
return -1;
413
494
}
414
495
421
502
}
422
503
423
504
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
425
506
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
431
509
gnutls_global_deinit();
432
510
return -1;
433
511
}
434
512
435
513
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
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);
439
518
}
440
519
441
520
ret = gnutls_certificate_set_openpgp_key_file
442
521
(mc.cred, pubkeyfilename, seckeyfilename,
443
522
GNUTLS_OPENPGP_FMT_BASE64);
444
523
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
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));
450
529
goto globalfail;
451
530
}
452
531
453
532
/* GnuTLS server initialization */
454
533
ret = gnutls_dh_params_init(&mc.dh_params);
455
534
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
458
538
goto globalfail;
459
539
}
460
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
541
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
464
544
goto globalfail;
465
545
}
466
546
486
566
}
487
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
568
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
491
572
}
492
573
493
574
{
500
581
}
501
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
583
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
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));
506
587
gnutls_deinit(*session);
507
588
return -1;
508
589
}
517
598
}
518
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
600
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
522
603
gnutls_deinit(*session);
523
604
return -1;
524
605
}
569
650
pf = PF_INET;
570
651
break;
571
652
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
654
errno = EINVAL;
574
655
return -1;
575
656
}
580
661
}
581
662
582
663
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
585
666
}
586
667
587
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
669
if(tcp_sd < 0){
589
670
int e = errno;
590
perror("socket");
671
perror_plus("socket");
591
672
errno = e;
592
673
goto mandos_end;
593
674
}
607
688
}
608
689
if(ret < 0 ){
609
690
int e = errno;
610
perror("inet_pton");
691
perror_plus("inet_pton");
611
692
errno = e;
612
693
goto mandos_end;
613
694
}
614
695
if(ret == 0){
615
696
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
698
errno = e;
618
699
goto mandos_end;
619
700
}
624
705
625
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
708
-Wunreachable-code*/
628
709
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
631
712
errno = EINVAL;
632
713
goto mandos_end;
633
714
}
649
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
731
char interface[IF_NAMESIZE];
651
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
733
perror_plus("if_indextoname");
653
734
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
656
737
}
657
738
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
660
741
}
661
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
750
sizeof(addrstr));
670
751
}
671
752
if(pcret == NULL){
672
perror("inet_ntop");
753
perror_plus("inet_ntop");
673
754
} else {
674
755
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
676
757
}
677
758
}
678
759
}
688
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
770
}
690
771
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
694
777
goto mandos_end;
695
778
}
696
779
704
787
while(true){
705
788
size_t out_size = strlen(out);
706
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
790
out_size - written));
708
791
if(ret == -1){
709
792
int e = errno;
710
perror("write");
793
perror_plus("write");
711
794
errno = e;
712
795
goto mandos_end;
713
796
}
730
813
}
731
814
732
815
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
817
}
735
818
736
819
if(quit_now){
738
821
goto mandos_end;
739
822
}
740
823
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
824
/* This casting via intptr_t is to eliminate warning about casting
825
an int to a pointer type. This is exactly how the GnuTLS Guile
826
function "set-session-transport-fd!" does it. */
827
gnutls_transport_set_ptr(session,
828
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
742
829
743
830
if(quit_now){
744
831
errno = EINTR;
755
842
756
843
if(ret != GNUTLS_E_SUCCESS){
757
844
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
846
gnutls_perror(ret);
760
847
}
761
848
errno = EPROTO;
765
852
/* Read OpenPGP packet that contains the wanted password */
766
853
767
854
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
770
857
}
771
858
772
859
while(true){
777
864
}
778
865
779
866
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
867
buffer_capacity);
781
868
if(buffer_capacity == 0){
782
869
int e = errno;
783
perror("incbuffer");
870
perror_plus("incbuffer");
784
871
errno = e;
785
872
goto mandos_end;
786
873
}
810
897
}
811
898
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
899
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
814
902
gnutls_perror(ret);
815
903
errno = EPROTO;
816
904
goto mandos_end;
817
905
}
818
906
break;
819
907
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
822
910
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
911
errno = EIO;
824
912
goto mandos_end;
829
917
}
830
918
831
919
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
920
fprintf_plus(stderr, "Closing TLS session\n");
833
921
}
834
922
835
923
if(quit_now){
847
935
848
936
if(buffer_length > 0){
849
937
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
852
939
&decrypted_buffer);
853
940
if(decrypted_buffer_size >= 0){
854
941
865
952
if(ret == 0 and ferror(stdout)){
866
953
int e = errno;
867
954
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
870
957
}
871
958
errno = e;
872
959
goto mandos_end;
891
978
if(e == 0){
892
979
e = errno;
893
980
}
894
perror("close");
981
perror_plus("close");
895
982
}
896
983
gnutls_deinit(session);
984
errno = e;
897
985
if(quit_now){
898
e = EINTR;
986
errno = EINTR;
899
987
retval = -1;
900
988
}
901
errno = e;
902
989
}
903
990
return retval;
904
991
}
929
1016
switch(event){
930
1017
default:
931
1018
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
935
1023
break;
936
1024
937
1025
case AVAHI_RESOLVER_FOUND:
939
1027
char ip[AVAHI_ADDRESS_STR_MAX];
940
1028
avahi_address_snprint(ip, sizeof(ip), address);
941
1029
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1030
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
host_name, ip, (intmax_t)interface, port);
945
1033
}
946
1034
int ret = start_mandos_communication(ip, port, interface,
947
1035
avahi_proto_to_af(proto));
948
1036
if(ret == 0){
949
1037
avahi_simple_poll_quit(mc.simple_poll);
1038
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
" list\n", name);
1043
}
950
1044
}
951
1045
}
952
1046
}
976
1070
default:
977
1071
case AVAHI_BROWSER_FAILURE:
978
1072
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
981
1075
avahi_simple_poll_quit(mc.simple_poll);
982
1076
return;
983
1077
990
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
1085
name, type, domain, protocol, 0,
992
1086
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
995
1090
break;
996
1091
997
1092
case AVAHI_BROWSER_REMOVE:
1000
1095
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1096
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1097
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
1004
1100
}
1005
1101
break;
1006
1102
}
1007
1103
}
1008
1104
1009
/* stop main loop after sigterm has been called */
1105
/* Signal handler that stops main loop after SIGTERM */
1010
1106
static void handle_sigterm(int sig){
1011
1107
if(quit_now){
1012
1108
return;
1014
1110
quit_now = 1;
1015
1111
signal_received = sig;
1016
1112
int old_errno = errno;
1113
/* set main loop to exit */
1017
1114
if(mc.simple_poll != NULL){
1018
1115
avahi_simple_poll_quit(mc.simple_poll);
1019
1116
}
1020
1117
errno = old_errno;
1021
1118
}
1022
1119
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
int ret;
1122
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
if(s < 0){
1125
perror_plus("socket");
1126
return false;
1127
}
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
if(ret == -1){
1131
if(debug){
1132
perror_plus("ioctl SIOCGIFFLAGS");
1133
}
1134
return false;
1135
}
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1141
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1143
if(debug){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1146
}
1147
return false;
1148
}
1149
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1151
if(debug){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1154
}
1155
return true;
1156
}
1157
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1159
if(debug){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1167
if(debug){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
ifname);
1170
}
1171
return false;
1172
}
1173
1174
/* Accept this device */
1175
if(debug){
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
}
1178
return true;
1179
}
1180
1181
/*
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1185
*/
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
1191
struct ifreq ifr;
1192
if(not get_flags(if_entry->d_name, &ifr)){
1193
if(debug){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1196
}
1197
return 0;
1198
}
1199
1200
if(not good_flags(if_entry->d_name, &ifr)){
1201
return 0;
1202
}
1203
return 1;
1204
}
1205
1206
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
bool run_network_hooks(const char *mode, const char *interface,
1394
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1400
if(numhooks == -1){
1401
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1409
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1478
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1527
}
1528
1023
1529
int main(int argc, char *argv[]){
1024
1530
AvahiSServiceBrowser *sb = NULL;
1025
1531
int error;
1027
1533
intmax_t tmpmax;
1028
1534
char *tmp;
1029
1535
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1536
const char *interface = "";
1031
1537
struct ifreq network;
1032
1538
int sd = -1;
1033
1539
bool take_down_interface = false;
1034
1540
uid_t uid;
1035
1541
gid_t gid;
1036
char *connect_to = NULL;
1037
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1543
bool tempdir_created = false;
1039
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1043
1548
bool gnutls_initialized = false;
1044
1549
bool gpgme_initialized = false;
1045
1550
float delay = 2.5f;
1551
double retry_interval = 10; /* 10s between trying a server and
1552
retrying the same server again */
1046
1553
1047
1554
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1555
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1561
errno = 0;
1055
1562
ret = setgid(gid);
1056
1563
if(ret == -1){
1057
perror("setgid");
1564
perror_plus("setgid");
1058
1565
}
1059
1566
1060
1567
/* Lower user privileges (temporarily) */
1061
1568
errno = 0;
1062
1569
ret = seteuid(uid);
1063
1570
if(ret == -1){
1064
perror("seteuid");
1571
perror_plus("seteuid");
1065
1572
}
1066
1573
1067
1574
if(quit_now){
1102
1609
.arg = "SECONDS",
1103
1610
.doc = "Maximum delay to wait for interface startup",
1104
1611
.group = 2 },
1612
{ .name = "retry", .key = 132,
1613
.arg = "SECONDS",
1614
.doc = "Retry interval used when denied by the Mandos server",
1615
.group = 2 },
1616
{ .name = "network-hook-dir", .key = 133,
1617
.arg = "DIR",
1618
.doc = "Directory where network hooks are located",
1619
.group = 2 },
1105
1620
/*
1106
1621
* These reproduce what we would get without ARGP_NO_HELP
1107
1622
*/
1151
1666
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1667
argp_error(state, "Bad delay");
1153
1668
}
1669
case 132: /* --retry */
1670
errno = 0;
1671
retry_interval = strtod(arg, &tmp);
1672
if(errno != 0 or tmp == arg or *tmp != '\0'
1673
or (retry_interval * 1000) > INT_MAX
1674
or retry_interval < 0){
1675
argp_error(state, "Bad retry interval");
1676
}
1677
break;
1678
case 133: /* --network-hook-dir */
1679
hookdir = arg;
1154
1680
break;
1155
1681
/*
1156
1682
* These reproduce what we would get without ARGP_NO_HELP
1163
1689
argp_state_help(state, state->out_stream,
1164
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1691
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1693
exit(argp_err_exit_status);
1168
1694
break;
1169
1695
default:
1184
1710
case ENOMEM:
1185
1711
default:
1186
1712
errno = ret;
1187
perror("argp_parse");
1713
perror_plus("argp_parse");
1188
1714
exitcode = EX_OSERR;
1189
1715
goto end;
1190
1716
case EINVAL:
1192
1718
goto end;
1193
1719
}
1194
1720
}
1721
1722
{
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1725
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1732
struct stat st;
1733
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1738
} else {
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1740
if(ret == -1){
1741
perror_plus("fstat");
1742
} else {
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1746
if(ret == -1){
1747
perror_plus("fchown");
1748
}
1749
}
1750
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
}
1753
}
1754
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1759
} else {
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1761
if(ret == -1){
1762
perror_plus("fstat");
1763
} else {
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1767
if(ret == -1){
1768
perror_plus("fchown");
1769
}
1770
}
1771
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
1776
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
1781
}
1782
}
1783
}
1784
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
1788
}
1195
1789
1196
1790
if(not debug){
1197
1791
avahi_set_log_function(empty_log);
1198
1792
}
1199
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1200
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1827
from the signal handler */
1202
1828
/* Initialize the pseudo-RNG for Avahi */
1203
1829
srand((unsigned int) time(NULL));
1204
1830
mc.simple_poll = avahi_simple_poll_new();
1205
1831
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1207
1834
exitcode = EX_UNAVAILABLE;
1208
1835
goto end;
1209
1836
}
1211
1838
sigemptyset(&sigterm_action.sa_mask);
1212
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
1840
if(ret == -1){
1214
perror("sigaddset");
1841
perror_plus("sigaddset");
1215
1842
exitcode = EX_OSERR;
1216
1843
goto end;
1217
1844
}
1218
1845
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
1846
if(ret == -1){
1220
perror("sigaddset");
1847
perror_plus("sigaddset");
1221
1848
exitcode = EX_OSERR;
1222
1849
goto end;
1223
1850
}
1224
1851
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
1852
if(ret == -1){
1226
perror("sigaddset");
1853
perror_plus("sigaddset");
1227
1854
exitcode = EX_OSERR;
1228
1855
goto end;
1229
1856
}
1233
1860
*/
1234
1861
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
1862
if(ret == -1){
1236
perror("sigaction");
1863
perror_plus("sigaction");
1237
1864
return EX_OSERR;
1238
1865
}
1239
1866
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
1867
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
1868
if(ret == -1){
1242
perror("sigaction");
1869
perror_plus("sigaction");
1243
1870
exitcode = EX_OSERR;
1244
1871
goto end;
1245
1872
}
1246
1873
}
1247
1874
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
1875
if(ret == -1){
1249
perror("sigaction");
1876
perror_plus("sigaction");
1250
1877
return EX_OSERR;
1251
1878
}
1252
1879
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
1880
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
1881
if(ret == -1){
1255
perror("sigaction");
1882
perror_plus("sigaction");
1256
1883
exitcode = EX_OSERR;
1257
1884
goto end;
1258
1885
}
1259
1886
}
1260
1887
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
1888
if(ret == -1){
1262
perror("sigaction");
1889
perror_plus("sigaction");
1263
1890
return EX_OSERR;
1264
1891
}
1265
1892
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
1893
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
1894
if(ret == -1){
1268
perror("sigaction");
1895
perror_plus("sigaction");
1269
1896
exitcode = EX_OSERR;
1270
1897
goto end;
1271
1898
}
1272
1899
}
1273
1900
1274
1901
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1902
if(strcmp(interface, "none") != 0){
1276
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1904
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1279
1906
exitcode = EX_UNAVAILABLE;
1280
1907
goto end;
1281
1908
}
1288
1915
errno = 0;
1289
1916
ret = seteuid(0);
1290
1917
if(ret == -1){
1291
perror("seteuid");
1918
perror_plus("seteuid");
1292
1919
}
1293
1920
1294
1921
#ifdef __linux__
1298
1925
bool restore_loglevel = true;
1299
1926
if(ret == -1){
1300
1927
restore_loglevel = false;
1301
perror("klogctl");
1928
perror_plus("klogctl");
1302
1929
}
1303
1930
#endif /* __linux__ */
1304
1931
1305
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
1933
if(sd < 0){
1307
perror("socket");
1934
perror_plus("socket");
1308
1935
exitcode = EX_OSERR;
1309
1936
#ifdef __linux__
1310
1937
if(restore_loglevel){
1311
1938
ret = klogctl(7, NULL, 0);
1312
1939
if(ret == -1){
1313
perror("klogctl");
1940
perror_plus("klogctl");
1314
1941
}
1315
1942
}
1316
1943
#endif /* __linux__ */
1318
1945
errno = 0;
1319
1946
ret = seteuid(uid);
1320
1947
if(ret == -1){
1321
perror("seteuid");
1948
perror_plus("seteuid");
1322
1949
}
1323
1950
goto end;
1324
1951
}
1325
1952
strcpy(network.ifr_name, interface);
1326
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
1954
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1955
perror_plus("ioctl SIOCGIFFLAGS");
1329
1956
#ifdef __linux__
1330
1957
if(restore_loglevel){
1331
1958
ret = klogctl(7, NULL, 0);
1332
1959
if(ret == -1){
1333
perror("klogctl");
1960
perror_plus("klogctl");
1334
1961
}
1335
1962
}
1336
1963
#endif /* __linux__ */
1339
1966
errno = 0;
1340
1967
ret = seteuid(uid);
1341
1968
if(ret == -1){
1342
perror("seteuid");
1969
perror_plus("seteuid");
1343
1970
}
1344
1971
goto end;
1345
1972
}
1349
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1977
if(ret == -1){
1351
1978
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1353
1980
exitcode = EX_OSERR;
1354
1981
#ifdef __linux__
1355
1982
if(restore_loglevel){
1356
1983
ret = klogctl(7, NULL, 0);
1357
1984
if(ret == -1){
1358
perror("klogctl");
1985
perror_plus("klogctl");
1359
1986
}
1360
1987
}
1361
1988
#endif /* __linux__ */
1363
1990
errno = 0;
1364
1991
ret = seteuid(uid);
1365
1992
if(ret == -1){
1366
perror("seteuid");
1993
perror_plus("seteuid");
1367
1994
}
1368
1995
goto end;
1369
1996
}
1370
1997
}
1371
/* sleep checking until interface is running */
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1372
2000
for(int i=0; i < delay * 4; i++){
1373
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
2002
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
2003
perror_plus("ioctl SIOCGIFFLAGS");
1376
2004
} else if(network.ifr_flags & IFF_RUNNING){
1377
2005
break;
1378
2006
}
1379
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
2008
ret = nanosleep(&sleeptime, NULL);
1381
2009
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
2010
perror_plus("nanosleep");
1383
2011
}
1384
2012
}
1385
2013
if(not take_down_interface){
1386
2014
/* We won't need the socket anymore */
1387
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
2016
if(ret == -1){
1389
perror("close");
2017
perror_plus("close");
1390
2018
}
1391
2019
}
1392
2020
#ifdef __linux__
1394
2022
/* Restores kernel loglevel to default */
1395
2023
ret = klogctl(7, NULL, 0);
1396
2024
if(ret == -1){
1397
perror("klogctl");
2025
perror_plus("klogctl");
1398
2026
}
1399
2027
}
1400
2028
#endif /* __linux__ */
1401
2029
/* Lower privileges */
1402
2030
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
1415
2035
}
1416
2036
}
1417
2037
1421
2041
1422
2042
ret = init_gnutls_global(pubkey, seckey);
1423
2043
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2045
exitcode = EX_UNAVAILABLE;
1426
2046
goto end;
1427
2047
} else {
1432
2052
goto end;
1433
2053
}
1434
2054
2055
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
2057
goto end;
2058
}
1435
2059
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2060
1442
2061
if(quit_now){
1443
2062
goto end;
1444
2063
}
1445
2064
1446
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2066
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2067
exitcode = EX_UNAVAILABLE;
1449
2068
goto end;
1450
2069
} else {
1460
2079
/* (Mainly meant for debugging) */
1461
2080
char *address = strrchr(connect_to, ':');
1462
2081
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2082
fprintf_plus(stderr, "No colon in address\n");
1464
2083
exitcode = EX_USAGE;
1465
2084
goto end;
1466
2085
}
1474
2093
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
2095
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2096
fprintf_plus(stderr, "Bad port number\n");
1478
2097
exitcode = EX_USAGE;
1479
2098
goto end;
1480
2099
}
1485
2104
1486
2105
port = (uint16_t)tmpmax;
1487
2106
*address = '\0';
1488
address = connect_to;
1489
2107
/* Colon in address indicates IPv6 */
1490
2108
int af;
1491
if(strchr(address, ':') != NULL){
2109
if(strchr(connect_to, ':') != NULL){
1492
2110
af = AF_INET6;
2111
/* Accept [] around IPv6 address - see RFC 5952 */
2112
if(connect_to[0] == '[' and address[-1] == ']')
2113
{
2114
connect_to++;
2115
address[-1] = '\0';
2116
}
1493
2117
} else {
1494
2118
af = AF_INET;
1495
2119
}
2120
address = connect_to;
1496
2121
1497
2122
if(quit_now){
1498
2123
goto end;
1499
2124
}
1500
2125
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2126
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2128
if(quit_now or ret == 0){
2129
break;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2134
}
2135
sleep((int)retry_interval);
2136
}
2137
2138
if (not quit_now){
1523
2139
exitcode = EXIT_SUCCESS;
1524
2140
}
2141
1525
2142
goto end;
1526
2143
}
1527
2144
1549
2166
1550
2167
/* Check if creating the Avahi server object succeeded */
1551
2168
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
1554
2171
exitcode = EX_UNAVAILABLE;
1555
2172
goto end;
1556
2173
}
1564
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
2182
NULL, 0, browse_callback, NULL);
1566
2183
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
1569
2186
exitcode = EX_UNAVAILABLE;
1570
2187
goto end;
1571
2188
}
1577
2194
/* Run the main loop */
1578
2195
1579
2196
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2202
if(debug){
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
2205
}
1584
2206
1585
2207
end:
1586
2208
1587
2209
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2211
}
1590
2212
1591
2213
/* Cleanup things */
1608
2230
gpgme_release(mc.ctx);
1609
2231
}
1610
2232
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
2233
/* Cleans up the circular linked list of Mandos servers the client
2234
has seen */
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2241
}
2242
}
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2248
{
1614
2249
errno = 0;
1615
2250
ret = seteuid(0);
1616
2251
if(ret == -1){
1617
perror("seteuid");
2252
perror_plus("seteuid");
1618
2253
}
1619
if(geteuid() == 0){
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1620
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
2258
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
1624
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
2263
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1628
2265
}
1629
2266
}
1630
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
2268
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2269
perror_plus("close");
1639
2270
}
1640
2271
}
1641
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
1642
2279
1643
/* Removes the temp directory used by GPGME */
2280
/* Removes the GPGME temp directory and all files inside */
1644
2281
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
1665
2289
char *fullname = NULL;
1666
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2291
direntry->d_name);
1668
2292
if(ret < 0){
1669
perror("asprintf");
2293
perror_plus("asprintf");
1670
2294
continue;
1671
2295
}
1672
2296
ret = remove(fullname);
1673
2297
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
1676
2300
}
1677
2301
free(fullname);
1678
2302
}
1679
closedir(d);
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
1680
2309
}
1681
2310
ret = rmdir(tempdir);
1682
2311
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2312
perror_plus("rmdir");
1684
2313
}
1685
2314
}
1686
2315
1691
2320
&old_sigterm_action,
1692
2321
NULL));
1693
2322
if(ret == -1){
1694
perror("sigaction");
2323
perror_plus("sigaction");
1695
2324
}
1696
2325
do {
1697
2326
ret = raise(signal_received);
1698
2327
} while(ret != 0 and errno == EINTR);
1699
2328
if(ret != 0){
1700
perror("raise");
2329
perror_plus("raise");
1701
2330
abort();
1702
2331
}
1703
2332
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0