(root)/mandos/release
» Revision
237.7.20
(compared to revision 237.7.79)
: 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 237.7.20
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.20
- Committer: Teddy Hogeborn
- Date: 2011-03-08 19:09:03 UTC
- mto: (24.1.171 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 282.
- Revision ID: teddy@fukt.bsnet.se-20110308190903-j499ebtb9bpk31ar
* INSTALL: Updated.
- files removed:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
87
92
88
#ifdef __linux__
93
89
#include <sys/klog.h> /* klogctl() */
111
107
init_gnutls_session(),
112
108
GNUTLS_* */
113
109
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
116
112
117
113
/* GPGME */
118
114
#include <gpgme.h> /* All GPGME types, constants and
126
122
#define PATHDIR "/conf/conf.d/mandos"
127
123
#define SECKEY "seckey.txt"
128
124
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
125
131
126
bool debug = false;
132
127
static const char mandos_protocol_version[] = "1";
133
128
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
130
static const char sys_class_net[] = "/sys/class/net";
136
131
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;
149
132
150
133
/* Used for passing in values through the Avahi callback functions */
151
134
typedef struct {
156
139
gnutls_dh_params_t dh_params;
157
140
const char *priority;
158
141
gpgme_ctx_t ctx;
159
server *current_server;
160
142
} mandos_context;
161
143
162
144
/* global context so signal handler can reach it*/
163
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
146
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
167
148
168
149
sig_atomic_t quit_now = 0;
169
150
int signal_received = 0;
170
151
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
187
152
/*
188
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
154
* bytes. "buffer_capacity" is how much is currently allocated,
190
155
* "buffer_length" is how much is already used.
191
156
*/
192
157
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
158
size_t buffer_capacity){
194
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
161
if(buffer == NULL){
201
166
return buffer_capacity;
202
167
}
203
168
204
/* Add server to set of servers to retry periodically */
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return false;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return false;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
237
}
238
return true;
239
}
240
241
169
/*
242
170
* Initialize GPGME.
243
171
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
246
174
gpgme_error_t rc;
247
175
gpgme_engine_info_t engine_info;
248
176
257
185
258
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
187
if(fd == -1){
260
perror_plus("open");
188
perror("open");
261
189
return false;
262
190
}
263
191
264
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
193
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
268
196
return false;
269
197
}
270
198
271
199
rc = gpgme_op_import(mc.ctx, pgp_data);
272
200
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
275
203
return false;
276
204
}
277
205
278
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
207
if(ret == -1){
280
perror_plus("close");
208
perror("close");
281
209
}
282
210
gpgme_data_release(pgp_data);
283
211
return true;
284
212
}
285
213
286
214
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
288
216
}
289
217
290
218
/* Init GPGME */
291
219
gpgme_check_version(NULL);
292
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
221
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
296
224
return false;
297
225
}
298
226
299
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
300
228
rc = gpgme_get_engine_info(&engine_info);
301
229
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
304
232
return false;
305
233
}
306
234
while(engine_info != NULL){
312
240
engine_info = engine_info->next;
313
241
}
314
242
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
244
return false;
318
245
}
319
246
320
247
/* Create new GPGME "context" */
321
248
rc = gpgme_new(&(mc.ctx));
322
249
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
326
252
return false;
327
253
}
328
254
347
273
ssize_t plaintext_length = 0;
348
274
349
275
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
277
}
352
278
353
279
/* Create new GPGME data buffer from memory cryptotext */
354
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
281
0);
356
282
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
359
285
return -1;
360
286
}
361
287
362
288
/* Create new empty GPGME data buffer for the plaintext */
363
289
rc = gpgme_data_new(&dh_plain);
364
290
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
368
293
gpgme_data_release(dh_crypto);
369
294
return -1;
370
295
}
373
298
data buffer */
374
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
300
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
378
303
plaintext_length = -1;
379
304
if(debug){
380
305
gpgme_decrypt_result_t result;
381
306
result = gpgme_op_decrypt_result(mc.ctx);
382
307
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
309
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
389
314
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
391
316
}
392
317
gpgme_recipient_t recipient;
393
318
recipient = result->recipients;
394
319
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
402
326
recipient = recipient->next;
403
327
}
404
328
}
407
331
}
408
332
409
333
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
335
}
412
336
413
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
416
340
plaintext_length = -1;
417
341
goto decrypt_end;
418
342
}
420
344
*plaintext = NULL;
421
345
while(true){
422
346
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
425
349
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
429
353
}
430
354
431
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
360
break;
437
361
}
438
362
if(ret < 0){
439
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
440
364
plaintext_length = -1;
441
365
goto decrypt_end;
442
366
}
444
368
}
445
369
446
370
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
448
372
for(ssize_t i = 0; i < plaintext_length; i++){
449
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
374
}
472
396
/* GnuTLS log function callback */
473
397
static void debuggnutls(__attribute__((unused)) int level,
474
398
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
476
400
}
477
401
478
402
static int init_gnutls_global(const char *pubkeyfilename,
480
404
int ret;
481
405
482
406
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
484
408
}
485
409
486
410
ret = gnutls_global_init();
487
411
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
490
414
return -1;
491
415
}
492
416
499
423
}
500
424
501
425
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
503
427
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
506
433
gnutls_global_deinit();
507
434
return -1;
508
435
}
509
436
510
437
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
515
441
}
516
442
517
443
ret = gnutls_certificate_set_openpgp_key_file
518
444
(mc.cred, pubkeyfilename, seckeyfilename,
519
445
GNUTLS_OPENPGP_FMT_BASE64);
520
446
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
526
452
goto globalfail;
527
453
}
528
454
529
455
/* GnuTLS server initialization */
530
456
ret = gnutls_dh_params_init(&mc.dh_params);
531
457
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
535
460
goto globalfail;
536
461
}
537
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
463
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
541
466
goto globalfail;
542
467
}
543
468
563
488
}
564
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
490
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
569
493
}
570
494
571
495
{
578
502
}
579
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
504
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
584
508
gnutls_deinit(*session);
585
509
return -1;
586
510
}
595
519
}
596
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
521
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
600
524
gnutls_deinit(*session);
601
525
return -1;
602
526
}
647
571
pf = PF_INET;
648
572
break;
649
573
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
651
575
errno = EINVAL;
652
576
return -1;
653
577
}
658
582
}
659
583
660
584
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
663
587
}
664
588
665
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
590
if(tcp_sd < 0){
667
591
int e = errno;
668
perror_plus("socket");
592
perror("socket");
669
593
errno = e;
670
594
goto mandos_end;
671
595
}
685
609
}
686
610
if(ret < 0 ){
687
611
int e = errno;
688
perror_plus("inet_pton");
612
perror("inet_pton");
689
613
errno = e;
690
614
goto mandos_end;
691
615
}
692
616
if(ret == 0){
693
617
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
695
619
errno = e;
696
620
goto mandos_end;
697
621
}
702
626
703
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
629
-Wunreachable-code*/
706
630
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
709
633
errno = EINVAL;
710
634
goto mandos_end;
711
635
}
727
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
652
char interface[IF_NAMESIZE];
729
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
654
perror("if_indextoname");
731
655
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
734
658
}
735
659
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
738
662
}
739
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
747
671
sizeof(addrstr));
748
672
}
749
673
if(pcret == NULL){
750
perror_plus("inet_ntop");
674
perror("inet_ntop");
751
675
} else {
752
676
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
678
}
755
679
}
756
680
}
768
692
if(ret < 0){
769
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
694
int e = errno;
771
perror_plus("connect");
695
perror("connect");
772
696
errno = e;
773
697
}
774
698
goto mandos_end;
784
708
while(true){
785
709
size_t out_size = strlen(out);
786
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
711
out_size - written));
788
712
if(ret == -1){
789
713
int e = errno;
790
perror_plus("write");
714
perror("write");
791
715
errno = e;
792
716
goto mandos_end;
793
717
}
810
734
}
811
735
812
736
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
738
}
815
739
816
740
if(quit_now){
818
742
goto mandos_end;
819
743
}
820
744
821
/* Spurious warning from -Wint-to-pointer-cast */
822
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
746
824
747
if(quit_now){
836
759
837
760
if(ret != GNUTLS_E_SUCCESS){
838
761
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
763
gnutls_perror(ret);
841
764
}
842
765
errno = EPROTO;
846
769
/* Read OpenPGP packet that contains the wanted password */
847
770
848
771
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
851
774
}
852
775
853
776
while(true){
858
781
}
859
782
860
783
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
784
buffer_capacity);
862
785
if(buffer_capacity == 0){
863
786
int e = errno;
864
perror_plus("incbuffer");
787
perror("incbuffer");
865
788
errno = e;
866
789
goto mandos_end;
867
790
}
891
814
}
892
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
816
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
818
gnutls_perror(ret);
897
819
errno = EPROTO;
898
820
goto mandos_end;
899
821
}
900
822
break;
901
823
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
904
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
827
errno = EIO;
906
828
goto mandos_end;
911
833
}
912
834
913
835
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
915
837
}
916
838
917
839
if(quit_now){
929
851
930
852
if(buffer_length > 0){
931
853
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
933
856
&decrypted_buffer);
934
857
if(decrypted_buffer_size >= 0){
935
858
946
869
if(ret == 0 and ferror(stdout)){
947
870
int e = errno;
948
871
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
951
874
}
952
875
errno = e;
953
876
goto mandos_end;
972
895
if(e == 0){
973
896
e = errno;
974
897
}
975
perror_plus("close");
898
perror("close");
976
899
}
977
900
gnutls_deinit(session);
978
errno = e;
979
901
if(quit_now){
980
errno = EINTR;
902
e = EINTR;
981
903
retval = -1;
982
904
}
905
errno = e;
983
906
}
984
907
return retval;
985
908
}
1010
933
switch(event){
1011
934
default:
1012
935
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1017
939
break;
1018
940
1019
941
case AVAHI_RESOLVER_FOUND:
1021
943
char ip[AVAHI_ADDRESS_STR_MAX];
1022
944
avahi_address_snprint(ip, sizeof(ip), address);
1023
945
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1027
949
}
1028
950
int ret = start_mandos_communication(ip, port, interface,
1029
951
avahi_proto_to_af(proto));
1030
952
if(ret == 0){
1031
953
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
" list\n", name);
1037
}
1038
954
}
1039
955
}
1040
956
}
1064
980
default:
1065
981
case AVAHI_BROWSER_FAILURE:
1066
982
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1069
985
avahi_simple_poll_quit(mc.simple_poll);
1070
986
return;
1071
987
1078
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
995
name, type, domain, protocol, 0,
1080
996
resolve_callback, NULL) == NULL)
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1084
999
break;
1085
1000
1086
1001
case AVAHI_BROWSER_REMOVE:
1089
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1090
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1091
1006
if(debug){
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1094
1008
}
1095
1009
break;
1096
1010
}
1097
1011
}
1098
1012
1099
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1100
1014
static void handle_sigterm(int sig){
1101
1015
if(quit_now){
1102
1016
return;
1104
1018
quit_now = 1;
1105
1019
signal_received = sig;
1106
1020
int old_errno = errno;
1107
/* set main loop to exit */
1108
1021
if(mc.simple_poll != NULL){
1109
1022
avahi_simple_poll_quit(mc.simple_poll);
1110
1023
}
1111
1024
errno = old_errno;
1112
1025
}
1113
1026
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
int ret;
1116
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
if(s < 0){
1119
perror_plus("socket");
1120
return false;
1121
}
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
if(ret == -1){
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1125
1081
if(debug){
1126
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1127
1084
}
1128
return false;
1085
free(flagstring);
1086
return 0;
1129
1087
}
1130
return true;
1131
}
1132
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1135
1090
/* Reject the loopback device */
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1137
1092
if(debug){
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1140
1095
}
1141
return false;
1096
return 0;
1142
1097
}
1143
1098
/* Accept point-to-point devices only if connect_to is specified */
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1145
1100
if(debug){
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1148
1103
}
1149
return true;
1104
return 1;
1150
1105
}
1151
1106
/* Otherwise, reject non-broadcast-capable devices */
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1153
if(debug){
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return false;
1158
}
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1160
if(ifr->ifr_flags & IFF_NOARP){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1163
ifname);
1164
}
1165
return false;
1166
}
1167
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1168
1114
/* Accept this device */
1169
1115
if(debug){
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1171
}
1172
return true;
1173
}
1174
1175
/*
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1179
*/
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1182
return 0;
1183
}
1184
1185
struct ifreq ifr;
1186
if(not get_flags(if_entry->d_name, &ifr)){
1187
if(debug){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1190
}
1191
return 0;
1192
}
1193
1194
if(not good_flags(if_entry->d_name, &ifr)){
1195
return 0;
1196
}
1197
return 1;
1198
}
1199
1200
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1243
int notdotentries(const struct dirent *direntry){
1244
/* Skip "." and ".." */
1245
if(direntry->d_name[0] == '.'
1246
and (direntry->d_name[1] == '\0'
1247
or (direntry->d_name[1] == '.'
1248
and direntry->d_name[2] == '\0'))){
1249
return 0;
1250
}
1251
return 1;
1252
}
1253
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1256
int ret;
1257
size_t sret;
1258
struct stat st;
1259
1260
if((direntry->d_name)[0] == '\0'){
1261
/* Empty name? */
1262
return 0;
1263
}
1264
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1267
"0123456789"
1268
"_-");
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1271
if(debug){
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1273
direntry->d_name);
1274
}
1275
return 0;
1276
}
1277
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1286
if(ret == -1){
1287
if(debug){
1288
perror_plus("Could not stat hook");
1289
}
1290
return 0;
1291
}
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1294
if(debug){
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
direntry->d_name);
1297
}
1298
return 0;
1299
}
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(debug){
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1310
direntry->d_name);
1311
}
1312
return 1;
1313
}
1314
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1316
int ret;
1317
struct timespec now;
1318
struct timespec waited_time;
1319
intmax_t block_time;
1320
1321
while(true){
1322
if(mc.current_server == NULL){
1323
if (debug){
1324
fprintf_plus(stderr, "Wait until first server is found."
1325
" No timeout!\n");
1326
}
1327
ret = avahi_simple_poll_iterate(s, -1);
1328
} else {
1329
if (debug){
1330
fprintf_plus(stderr, "Check current_server if we should run"
1331
" it, or wait\n");
1332
}
1333
/* the current time */
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1335
if(ret == -1){
1336
perror_plus("clock_gettime");
1337
return -1;
1338
}
1339
/* Calculating in ms how long time between now and server
1340
who we visted longest time ago. Now - last seen. */
1341
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1343
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1345
/* total time is 10s/10,000ms.
1346
Converting to s from ms by dividing by 1,000,
1347
and ns to ms by dividing by 1,000,000. */
1348
block_time = ((retry_interval
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1351
1352
if (debug){
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
block_time);
1355
}
1356
1357
if(block_time <= 0){
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1362
if(ret == 0){
1363
avahi_simple_poll_quit(mc.simple_poll);
1364
return 0;
1365
}
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1368
if(ret == -1){
1369
perror_plus("clock_gettime");
1370
return -1;
1371
}
1372
mc.current_server = mc.current_server->next;
1373
block_time = 0; /* Call avahi to find new Mandos
1374
servers, but don't block */
1375
}
1376
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1378
}
1379
if(ret != 0){
1380
if (ret > 0 or errno != EINTR){
1381
return (ret != 1) ? ret : 0;
1382
}
1383
}
1384
}
1385
}
1386
1387
bool run_network_hooks(const char *mode, const char *interface,
1388
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1394
if(numhooks == -1){
1395
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1403
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1472
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1512
1120
}
1513
1121
1514
1122
int main(int argc, char *argv[]){
1533
1141
bool gnutls_initialized = false;
1534
1142
bool gpgme_initialized = false;
1535
1143
float delay = 2.5f;
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
1538
1144
1539
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1540
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1546
1152
errno = 0;
1547
1153
ret = setgid(gid);
1548
1154
if(ret == -1){
1549
perror_plus("setgid");
1155
perror("setgid");
1550
1156
}
1551
1157
1552
1158
/* Lower user privileges (temporarily) */
1553
1159
errno = 0;
1554
1160
ret = seteuid(uid);
1555
1161
if(ret == -1){
1556
perror_plus("seteuid");
1162
perror("seteuid");
1557
1163
}
1558
1164
1559
1165
if(quit_now){
1594
1200
.arg = "SECONDS",
1595
1201
.doc = "Maximum delay to wait for interface startup",
1596
1202
.group = 2 },
1597
{ .name = "retry", .key = 132,
1598
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1605
1203
/*
1606
1204
* These reproduce what we would get without ARGP_NO_HELP
1607
1205
*/
1651
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1652
1250
argp_error(state, "Bad delay");
1653
1251
}
1654
case 132: /* --retry */
1655
errno = 0;
1656
retry_interval = strtod(arg, &tmp);
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1660
argp_error(state, "Bad retry interval");
1661
}
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
1252
break;
1666
1253
/*
1667
1254
* These reproduce what we would get without ARGP_NO_HELP
1674
1261
argp_state_help(state, state->out_stream,
1675
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
1263
case 'V': /* --version */
1677
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1678
1265
exit(argp_err_exit_status);
1679
1266
break;
1680
1267
default:
1695
1282
case ENOMEM:
1696
1283
default:
1697
1284
errno = ret;
1698
perror_plus("argp_parse");
1285
perror("argp_parse");
1699
1286
exitcode = EX_OSERR;
1700
1287
goto end;
1701
1288
case EINVAL:
1703
1290
goto end;
1704
1291
}
1705
1292
}
1706
1707
{
1708
/* Work around Debian bug #633582:
1709
<http://bugs.debian.org/633582> */
1710
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
1716
} else {
1717
struct stat st;
1718
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1723
} else {
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
if(ret == -1){
1726
perror_plus("fstat");
1727
} else {
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1752
if(ret == -1){
1753
perror_plus("fchown");
1754
}
1755
}
1756
}
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
1761
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
1766
}
1767
}
1768
}
1769
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
1773
}
1774
1293
1775
1294
if(not debug){
1776
1295
avahi_set_log_function(empty_log);
1777
1296
}
1778
1297
1779
1298
if(interface[0] == '\0'){
1780
1299
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1783
1301
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
1302
if(ret >= 1){
1791
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1792
1304
interface = strdup(direntries[0]->d_name);
1793
1305
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1795
1307
}
1796
1308
if(interface == NULL){
1797
perror_plus("malloc");
1309
perror("malloc");
1798
1310
free(direntries);
1799
1311
exitcode = EXIT_FAILURE;
1800
1312
goto end;
1802
1314
free(direntries);
1803
1315
} else {
1804
1316
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1806
1318
exitcode = EXIT_FAILURE;
1807
1319
goto end;
1808
1320
}
1814
1326
srand((unsigned int) time(NULL));
1815
1327
mc.simple_poll = avahi_simple_poll_new();
1816
1328
if(mc.simple_poll == NULL){
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1819
1330
exitcode = EX_UNAVAILABLE;
1820
1331
goto end;
1821
1332
}
1823
1334
sigemptyset(&sigterm_action.sa_mask);
1824
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1825
1336
if(ret == -1){
1826
perror_plus("sigaddset");
1337
perror("sigaddset");
1827
1338
exitcode = EX_OSERR;
1828
1339
goto end;
1829
1340
}
1830
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1831
1342
if(ret == -1){
1832
perror_plus("sigaddset");
1343
perror("sigaddset");
1833
1344
exitcode = EX_OSERR;
1834
1345
goto end;
1835
1346
}
1836
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1837
1348
if(ret == -1){
1838
perror_plus("sigaddset");
1349
perror("sigaddset");
1839
1350
exitcode = EX_OSERR;
1840
1351
goto end;
1841
1352
}
1845
1356
*/
1846
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1847
1358
if(ret == -1){
1848
perror_plus("sigaction");
1359
perror("sigaction");
1849
1360
return EX_OSERR;
1850
1361
}
1851
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1852
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1853
1364
if(ret == -1){
1854
perror_plus("sigaction");
1365
perror("sigaction");
1855
1366
exitcode = EX_OSERR;
1856
1367
goto end;
1857
1368
}
1858
1369
}
1859
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1860
1371
if(ret == -1){
1861
perror_plus("sigaction");
1372
perror("sigaction");
1862
1373
return EX_OSERR;
1863
1374
}
1864
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1865
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1866
1377
if(ret == -1){
1867
perror_plus("sigaction");
1378
perror("sigaction");
1868
1379
exitcode = EX_OSERR;
1869
1380
goto end;
1870
1381
}
1871
1382
}
1872
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1873
1384
if(ret == -1){
1874
perror_plus("sigaction");
1385
perror("sigaction");
1875
1386
return EX_OSERR;
1876
1387
}
1877
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1878
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1879
1390
if(ret == -1){
1880
perror_plus("sigaction");
1391
perror("sigaction");
1881
1392
exitcode = EX_OSERR;
1882
1393
goto end;
1883
1394
}
1887
1398
if(strcmp(interface, "none") != 0){
1888
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
1400
if(if_index == 0){
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1891
1402
exitcode = EX_UNAVAILABLE;
1892
1403
goto end;
1893
1404
}
1900
1411
errno = 0;
1901
1412
ret = seteuid(0);
1902
1413
if(ret == -1){
1903
perror_plus("seteuid");
1414
perror("seteuid");
1904
1415
}
1905
1416
1906
1417
#ifdef __linux__
1910
1421
bool restore_loglevel = true;
1911
1422
if(ret == -1){
1912
1423
restore_loglevel = false;
1913
perror_plus("klogctl");
1424
perror("klogctl");
1914
1425
}
1915
1426
#endif /* __linux__ */
1916
1427
1917
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
1429
if(sd < 0){
1919
perror_plus("socket");
1430
perror("socket");
1920
1431
exitcode = EX_OSERR;
1921
1432
#ifdef __linux__
1922
1433
if(restore_loglevel){
1923
1434
ret = klogctl(7, NULL, 0);
1924
1435
if(ret == -1){
1925
perror_plus("klogctl");
1436
perror("klogctl");
1926
1437
}
1927
1438
}
1928
1439
#endif /* __linux__ */
1930
1441
errno = 0;
1931
1442
ret = seteuid(uid);
1932
1443
if(ret == -1){
1933
perror_plus("seteuid");
1444
perror("seteuid");
1934
1445
}
1935
1446
goto end;
1936
1447
}
1937
1448
strcpy(network.ifr_name, interface);
1938
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
1450
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1941
1452
#ifdef __linux__
1942
1453
if(restore_loglevel){
1943
1454
ret = klogctl(7, NULL, 0);
1944
1455
if(ret == -1){
1945
perror_plus("klogctl");
1456
perror("klogctl");
1946
1457
}
1947
1458
}
1948
1459
#endif /* __linux__ */
1951
1462
errno = 0;
1952
1463
ret = seteuid(uid);
1953
1464
if(ret == -1){
1954
perror_plus("seteuid");
1465
perror("seteuid");
1955
1466
}
1956
1467
goto end;
1957
1468
}
1961
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
1473
if(ret == -1){
1963
1474
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1965
1476
exitcode = EX_OSERR;
1966
1477
#ifdef __linux__
1967
1478
if(restore_loglevel){
1968
1479
ret = klogctl(7, NULL, 0);
1969
1480
if(ret == -1){
1970
perror_plus("klogctl");
1481
perror("klogctl");
1971
1482
}
1972
1483
}
1973
1484
#endif /* __linux__ */
1975
1486
errno = 0;
1976
1487
ret = seteuid(uid);
1977
1488
if(ret == -1){
1978
perror_plus("seteuid");
1489
perror("seteuid");
1979
1490
}
1980
1491
goto end;
1981
1492
}
1982
1493
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1985
1495
for(int i=0; i < delay * 4; i++){
1986
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
1497
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1989
1499
} else if(network.ifr_flags & IFF_RUNNING){
1990
1500
break;
1991
1501
}
1992
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
1503
ret = nanosleep(&sleeptime, NULL);
1994
1504
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1505
perror("nanosleep");
1996
1506
}
1997
1507
}
1998
1508
if(not take_down_interface){
1999
1509
/* We won't need the socket anymore */
2000
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
1511
if(ret == -1){
2002
perror_plus("close");
1512
perror("close");
2003
1513
}
2004
1514
}
2005
1515
#ifdef __linux__
2007
1517
/* Restores kernel loglevel to default */
2008
1518
ret = klogctl(7, NULL, 0);
2009
1519
if(ret == -1){
2010
perror_plus("klogctl");
1520
perror("klogctl");
2011
1521
}
2012
1522
}
2013
1523
#endif /* __linux__ */
2014
1524
/* Lower privileges */
2015
1525
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
2020
1538
}
2021
1539
}
2022
1540
2026
1544
2027
1545
ret = init_gnutls_global(pubkey, seckey);
2028
1546
if(ret == -1){
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2030
1548
exitcode = EX_UNAVAILABLE;
2031
1549
goto end;
2032
1550
} else {
2037
1555
goto end;
2038
1556
}
2039
1557
1558
tempdir_created = true;
2040
1559
if(mkdtemp(tempdir) == NULL){
2041
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2042
1562
goto end;
2043
1563
}
2044
tempdir_created = true;
2045
1564
2046
1565
if(quit_now){
2047
1566
goto end;
2048
1567
}
2049
1568
2050
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2051
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2052
1571
exitcode = EX_UNAVAILABLE;
2053
1572
goto end;
2054
1573
} else {
2064
1583
/* (Mainly meant for debugging) */
2065
1584
char *address = strrchr(connect_to, ':');
2066
1585
if(address == NULL){
2067
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2068
1587
exitcode = EX_USAGE;
2069
1588
goto end;
2070
1589
}
2078
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2079
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
1599
or tmpmax != (uint16_t)tmpmax){
2081
fprintf_plus(stderr, "Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2082
1601
exitcode = EX_USAGE;
2083
1602
goto end;
2084
1603
}
2089
1608
2090
1609
port = (uint16_t)tmpmax;
2091
1610
*address = '\0';
1611
address = connect_to;
2092
1612
/* Colon in address indicates IPv6 */
2093
1613
int af;
2094
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2095
1615
af = AF_INET6;
2096
/* Accept [] around IPv6 address - see RFC 5952 */
2097
if(connect_to[0] == '[' and address[-1] == ']')
2098
{
2099
connect_to++;
2100
address[-1] = '\0';
2101
}
2102
1616
} else {
2103
1617
af = AF_INET;
2104
1618
}
2105
address = connect_to;
2106
1619
2107
1620
if(quit_now){
2108
1621
goto end;
2109
1622
}
2110
1623
2111
1624
while(not quit_now){
2112
1625
ret = start_mandos_communication(address, port, if_index, af);
2113
1626
if(quit_now or ret == 0){
2114
1627
break;
2115
1628
}
2116
if(debug){
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
(int)retry_interval);
2119
}
2120
sleep((int)retry_interval);
2121
}
2122
1629
sleep(15);
1630
};
1631
2123
1632
if (not quit_now){
2124
1633
exitcode = EXIT_SUCCESS;
2125
1634
}
2126
1635
2127
1636
goto end;
2128
1637
}
2129
1638
2151
1660
2152
1661
/* Check if creating the Avahi server object succeeded */
2153
1662
if(mc.server == NULL){
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2156
1665
exitcode = EX_UNAVAILABLE;
2157
1666
goto end;
2158
1667
}
2166
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2167
1676
NULL, 0, browse_callback, NULL);
2168
1677
if(sb == NULL){
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2171
1680
exitcode = EX_UNAVAILABLE;
2172
1681
goto end;
2173
1682
}
2179
1688
/* Run the main loop */
2180
1689
2181
1690
if(debug){
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
2183
}
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2187
if(debug){
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
(ret == 0) ? "successfully" : "with error");
2190
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2191
1695
2192
1696
end:
2193
1697
2194
1698
if(debug){
2195
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1700
}
2197
1701
2198
1702
/* Cleanup things */
2215
1719
gpgme_release(mc.ctx);
2216
1720
}
2217
1721
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2233
{
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
2234
1725
errno = 0;
2235
1726
ret = seteuid(0);
2236
1727
if(ret == -1){
2237
perror_plus("seteuid");
1728
perror("seteuid");
2238
1729
}
2239
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
1730
if(geteuid() == 0){
2242
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
1732
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2246
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
1737
if(ret == -1){
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2250
1739
}
2251
1740
}
2252
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
1742
if(ret == -1){
2254
perror_plus("close");
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2255
1750
}
2256
1751
}
2257
1752
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2264
1753
2265
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2266
1755
if(tempdir_created){
2267
struct dirent **direntries = NULL;
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2274
1776
char *fullname = NULL;
2275
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
1778
direntry->d_name);
2277
1779
if(ret < 0){
2278
perror_plus("asprintf");
1780
perror("asprintf");
2279
1781
continue;
2280
1782
}
2281
1783
ret = remove(fullname);
2282
1784
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2285
1787
}
2286
1788
free(fullname);
2287
1789
}
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
1790
closedir(d);
2294
1791
}
2295
1792
ret = rmdir(tempdir);
2296
1793
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
1794
perror("rmdir");
2298
1795
}
2299
1796
}
2300
1797
2305
1802
&old_sigterm_action,
2306
1803
NULL));
2307
1804
if(ret == -1){
2308
perror_plus("sigaction");
1805
perror("sigaction");
2309
1806
}
2310
1807
do {
2311
1808
ret = raise(signal_received);
2312
1809
} while(ret != 0 and errno == EINTR);
2313
1810
if(ret != 0){
2314
perror_plus("raise");
1811
perror("raise");
2315
1812
abort();
2316
1813
}
2317
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0