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237.7.29
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: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-03-21 19:34:39 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 284.
- Revision ID: teddy@fukt.bsnet.se-20110321193439-lkj3kwvhmujd8lwv
* plugins.d/mandos-client.c (good_interface): Reject non-ARP
interfaces.
interfaces.
- 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
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
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
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1035
954
}
1036
955
}
1037
956
}
1061
980
default:
1062
981
case AVAHI_BROWSER_FAILURE:
1063
982
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1066
985
avahi_simple_poll_quit(mc.simple_poll);
1067
986
return;
1068
987
1075
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
995
name, type, domain, protocol, 0,
1077
996
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
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)));
1081
999
break;
1082
1000
1083
1001
case AVAHI_BROWSER_REMOVE:
1086
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
1006
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
1008
}
1092
1009
break;
1093
1010
}
1094
1011
}
1095
1012
1096
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1097
1014
static void handle_sigterm(int sig){
1098
1015
if(quit_now){
1099
1016
return;
1101
1018
quit_now = 1;
1102
1019
signal_received = sig;
1103
1020
int old_errno = errno;
1104
/* set main loop to exit */
1105
1021
if(mc.simple_poll != NULL){
1106
1022
avahi_simple_poll_quit(mc.simple_poll);
1107
1023
}
1108
1024
errno = old_errno;
1109
1025
}
1110
1026
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
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
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
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
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1122
1083
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1124
1086
}
1125
return false;
1087
free(flagstring);
1088
return 0;
1126
1089
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1132
1092
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1093
if(flags & IFF_LOOPBACK){
1134
1094
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1137
1097
}
1138
return false;
1098
return 0;
1139
1099
}
1140
1100
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1142
1102
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1145
1105
}
1146
return true;
1106
return 1;
1147
1107
}
1148
1108
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1109
if(not (flags & IFF_BROADCAST)){
1150
1110
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1153
1113
}
1154
return false;
1114
return 0;
1155
1115
}
1156
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1117
if(flags & IFF_NOARP){
1158
1118
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
if_entry->d_name);
1161
1121
}
1162
return false;
1122
return 0;
1163
1123
}
1164
1165
1124
/* Accept this device */
1166
1125
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1127
if_entry->d_name);
1128
}
1129
return 1;
1509
1130
}
1510
1131
1511
1132
int main(int argc, char *argv[]){
1530
1151
bool gnutls_initialized = false;
1531
1152
bool gpgme_initialized = false;
1532
1153
float delay = 2.5f;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1535
1154
1536
1155
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1537
1156
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1543
1162
errno = 0;
1544
1163
ret = setgid(gid);
1545
1164
if(ret == -1){
1546
perror_plus("setgid");
1165
perror("setgid");
1547
1166
}
1548
1167
1549
1168
/* Lower user privileges (temporarily) */
1550
1169
errno = 0;
1551
1170
ret = seteuid(uid);
1552
1171
if(ret == -1){
1553
perror_plus("seteuid");
1172
perror("seteuid");
1554
1173
}
1555
1174
1556
1175
if(quit_now){
1591
1210
.arg = "SECONDS",
1592
1211
.doc = "Maximum delay to wait for interface startup",
1593
1212
.group = 2 },
1594
{ .name = "retry", .key = 132,
1595
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1602
1213
/*
1603
1214
* These reproduce what we would get without ARGP_NO_HELP
1604
1215
*/
1648
1259
if(errno != 0 or tmp == arg or *tmp != '\0'){
1649
1260
argp_error(state, "Bad delay");
1650
1261
}
1651
case 132: /* --retry */
1652
errno = 0;
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1658
}
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
1262
break;
1663
1263
/*
1664
1264
* These reproduce what we would get without ARGP_NO_HELP
1671
1271
argp_state_help(state, state->out_stream,
1672
1272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
1273
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1274
fprintf(state->out_stream, "%s\n", argp_program_version);
1677
1275
exit(argp_err_exit_status);
1678
1276
break;
1679
1277
default:
1694
1292
case ENOMEM:
1695
1293
default:
1696
1294
errno = ret;
1697
perror_plus("argp_parse");
1295
perror("argp_parse");
1698
1296
exitcode = EX_OSERR;
1699
1297
goto end;
1700
1298
case EINVAL:
1702
1300
goto end;
1703
1301
}
1704
1302
}
1705
1706
{
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1709
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1772
}
1773
1303
1774
1304
if(not debug){
1775
1305
avahi_set_log_function(empty_log);
1776
1306
}
1777
1307
1778
1308
if(interface[0] == '\0'){
1779
1309
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1782
1311
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
1312
if(ret >= 1){
1790
/* Pick the first interface returned */
1313
/* Pick the first good interface */
1791
1314
interface = strdup(direntries[0]->d_name);
1792
1315
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1794
1317
}
1795
1318
if(interface == NULL){
1796
perror_plus("malloc");
1319
perror("malloc");
1797
1320
free(direntries);
1798
1321
exitcode = EXIT_FAILURE;
1799
1322
goto end;
1801
1324
free(direntries);
1802
1325
} else {
1803
1326
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1327
fprintf(stderr, "Could not find a network interface\n");
1805
1328
exitcode = EXIT_FAILURE;
1806
1329
goto end;
1807
1330
}
1813
1336
srand((unsigned int) time(NULL));
1814
1337
mc.simple_poll = avahi_simple_poll_new();
1815
1338
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1339
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1818
1340
exitcode = EX_UNAVAILABLE;
1819
1341
goto end;
1820
1342
}
1822
1344
sigemptyset(&sigterm_action.sa_mask);
1823
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1824
1346
if(ret == -1){
1825
perror_plus("sigaddset");
1347
perror("sigaddset");
1826
1348
exitcode = EX_OSERR;
1827
1349
goto end;
1828
1350
}
1829
1351
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1830
1352
if(ret == -1){
1831
perror_plus("sigaddset");
1353
perror("sigaddset");
1832
1354
exitcode = EX_OSERR;
1833
1355
goto end;
1834
1356
}
1835
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1836
1358
if(ret == -1){
1837
perror_plus("sigaddset");
1359
perror("sigaddset");
1838
1360
exitcode = EX_OSERR;
1839
1361
goto end;
1840
1362
}
1844
1366
*/
1845
1367
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1846
1368
if(ret == -1){
1847
perror_plus("sigaction");
1369
perror("sigaction");
1848
1370
return EX_OSERR;
1849
1371
}
1850
1372
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
1373
ret = sigaction(SIGINT, &sigterm_action, NULL);
1852
1374
if(ret == -1){
1853
perror_plus("sigaction");
1375
perror("sigaction");
1854
1376
exitcode = EX_OSERR;
1855
1377
goto end;
1856
1378
}
1857
1379
}
1858
1380
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1859
1381
if(ret == -1){
1860
perror_plus("sigaction");
1382
perror("sigaction");
1861
1383
return EX_OSERR;
1862
1384
}
1863
1385
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
1386
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1865
1387
if(ret == -1){
1866
perror_plus("sigaction");
1388
perror("sigaction");
1867
1389
exitcode = EX_OSERR;
1868
1390
goto end;
1869
1391
}
1870
1392
}
1871
1393
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1872
1394
if(ret == -1){
1873
perror_plus("sigaction");
1395
perror("sigaction");
1874
1396
return EX_OSERR;
1875
1397
}
1876
1398
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
1399
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1878
1400
if(ret == -1){
1879
perror_plus("sigaction");
1401
perror("sigaction");
1880
1402
exitcode = EX_OSERR;
1881
1403
goto end;
1882
1404
}
1886
1408
if(strcmp(interface, "none") != 0){
1887
1409
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
1410
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1411
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1890
1412
exitcode = EX_UNAVAILABLE;
1891
1413
goto end;
1892
1414
}
1899
1421
errno = 0;
1900
1422
ret = seteuid(0);
1901
1423
if(ret == -1){
1902
perror_plus("seteuid");
1424
perror("seteuid");
1903
1425
}
1904
1426
1905
1427
#ifdef __linux__
1909
1431
bool restore_loglevel = true;
1910
1432
if(ret == -1){
1911
1433
restore_loglevel = false;
1912
perror_plus("klogctl");
1434
perror("klogctl");
1913
1435
}
1914
1436
#endif /* __linux__ */
1915
1437
1916
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
1439
if(sd < 0){
1918
perror_plus("socket");
1440
perror("socket");
1919
1441
exitcode = EX_OSERR;
1920
1442
#ifdef __linux__
1921
1443
if(restore_loglevel){
1922
1444
ret = klogctl(7, NULL, 0);
1923
1445
if(ret == -1){
1924
perror_plus("klogctl");
1446
perror("klogctl");
1925
1447
}
1926
1448
}
1927
1449
#endif /* __linux__ */
1929
1451
errno = 0;
1930
1452
ret = seteuid(uid);
1931
1453
if(ret == -1){
1932
perror_plus("seteuid");
1454
perror("seteuid");
1933
1455
}
1934
1456
goto end;
1935
1457
}
1936
1458
strcpy(network.ifr_name, interface);
1937
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
1460
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1461
perror("ioctl SIOCGIFFLAGS");
1940
1462
#ifdef __linux__
1941
1463
if(restore_loglevel){
1942
1464
ret = klogctl(7, NULL, 0);
1943
1465
if(ret == -1){
1944
perror_plus("klogctl");
1466
perror("klogctl");
1945
1467
}
1946
1468
}
1947
1469
#endif /* __linux__ */
1950
1472
errno = 0;
1951
1473
ret = seteuid(uid);
1952
1474
if(ret == -1){
1953
perror_plus("seteuid");
1475
perror("seteuid");
1954
1476
}
1955
1477
goto end;
1956
1478
}
1960
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
1483
if(ret == -1){
1962
1484
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1964
1486
exitcode = EX_OSERR;
1965
1487
#ifdef __linux__
1966
1488
if(restore_loglevel){
1967
1489
ret = klogctl(7, NULL, 0);
1968
1490
if(ret == -1){
1969
perror_plus("klogctl");
1491
perror("klogctl");
1970
1492
}
1971
1493
}
1972
1494
#endif /* __linux__ */
1974
1496
errno = 0;
1975
1497
ret = seteuid(uid);
1976
1498
if(ret == -1){
1977
perror_plus("seteuid");
1499
perror("seteuid");
1978
1500
}
1979
1501
goto end;
1980
1502
}
1981
1503
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1504
/* sleep checking until interface is running */
1984
1505
for(int i=0; i < delay * 4; i++){
1985
1506
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
1507
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1508
perror("ioctl SIOCGIFFLAGS");
1988
1509
} else if(network.ifr_flags & IFF_RUNNING){
1989
1510
break;
1990
1511
}
1991
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
1513
ret = nanosleep(&sleeptime, NULL);
1993
1514
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1515
perror("nanosleep");
1995
1516
}
1996
1517
}
1997
1518
if(not take_down_interface){
1998
1519
/* We won't need the socket anymore */
1999
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
1521
if(ret == -1){
2001
perror_plus("close");
1522
perror("close");
2002
1523
}
2003
1524
}
2004
1525
#ifdef __linux__
2006
1527
/* Restores kernel loglevel to default */
2007
1528
ret = klogctl(7, NULL, 0);
2008
1529
if(ret == -1){
2009
perror_plus("klogctl");
1530
perror("klogctl");
2010
1531
}
2011
1532
}
2012
1533
#endif /* __linux__ */
2013
1534
/* Lower privileges */
2014
1535
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
1536
if(take_down_interface){
1537
/* Lower privileges */
1538
ret = seteuid(uid);
1539
if(ret == -1){
1540
perror("seteuid");
1541
}
1542
} else {
1543
/* Lower privileges permanently */
1544
ret = setuid(uid);
1545
if(ret == -1){
1546
perror("setuid");
1547
}
2019
1548
}
2020
1549
}
2021
1550
2025
1554
2026
1555
ret = init_gnutls_global(pubkey, seckey);
2027
1556
if(ret == -1){
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
1557
fprintf(stderr, "init_gnutls_global failed\n");
2029
1558
exitcode = EX_UNAVAILABLE;
2030
1559
goto end;
2031
1560
} else {
2036
1565
goto end;
2037
1566
}
2038
1567
1568
tempdir_created = true;
2039
1569
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
1570
tempdir_created = false;
1571
perror("mkdtemp");
2041
1572
goto end;
2042
1573
}
2043
tempdir_created = true;
2044
1574
2045
1575
if(quit_now){
2046
1576
goto end;
2047
1577
}
2048
1578
2049
1579
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
1580
fprintf(stderr, "init_gpgme failed\n");
2051
1581
exitcode = EX_UNAVAILABLE;
2052
1582
goto end;
2053
1583
} else {
2063
1593
/* (Mainly meant for debugging) */
2064
1594
char *address = strrchr(connect_to, ':');
2065
1595
if(address == NULL){
2066
fprintf_plus(stderr, "No colon in address\n");
1596
fprintf(stderr, "No colon in address\n");
2067
1597
exitcode = EX_USAGE;
2068
1598
goto end;
2069
1599
}
2077
1607
tmpmax = strtoimax(address+1, &tmp, 10);
2078
1608
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
1609
or tmpmax != (uint16_t)tmpmax){
2080
fprintf_plus(stderr, "Bad port number\n");
1610
fprintf(stderr, "Bad port number\n");
2081
1611
exitcode = EX_USAGE;
2082
1612
goto end;
2083
1613
}
2088
1618
2089
1619
port = (uint16_t)tmpmax;
2090
1620
*address = '\0';
1621
address = connect_to;
2091
1622
/* Colon in address indicates IPv6 */
2092
1623
int af;
2093
if(strchr(connect_to, ':') != NULL){
1624
if(strchr(address, ':') != NULL){
2094
1625
af = AF_INET6;
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2097
{
2098
connect_to++;
2099
address[-1] = '\0';
2100
}
2101
1626
} else {
2102
1627
af = AF_INET;
2103
1628
}
2104
address = connect_to;
2105
1629
2106
1630
if(quit_now){
2107
1631
goto end;
2108
1632
}
2109
1633
2110
1634
while(not quit_now){
2111
1635
ret = start_mandos_communication(address, port, if_index, af);
2112
1636
if(quit_now or ret == 0){
2113
1637
break;
2114
1638
}
2115
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2118
}
2119
sleep((int)retry_interval);
2120
}
2121
1639
sleep(15);
1640
};
1641
2122
1642
if (not quit_now){
2123
1643
exitcode = EXIT_SUCCESS;
2124
1644
}
2125
1645
2126
1646
goto end;
2127
1647
}
2128
1648
2150
1670
2151
1671
/* Check if creating the Avahi server object succeeded */
2152
1672
if(mc.server == NULL){
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2155
1675
exitcode = EX_UNAVAILABLE;
2156
1676
goto end;
2157
1677
}
2165
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
1686
NULL, 0, browse_callback, NULL);
2167
1687
if(sb == NULL){
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2170
1690
exitcode = EX_UNAVAILABLE;
2171
1691
goto end;
2172
1692
}
2178
1698
/* Run the main loop */
2179
1699
2180
1700
if(debug){
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2186
if(debug){
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
2190
1705
2191
1706
end:
2192
1707
2193
1708
if(debug){
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2195
1710
}
2196
1711
2197
1712
/* Cleanup things */
2214
1729
gpgme_release(mc.ctx);
2215
1730
}
2216
1731
2217
/* Cleans up the circular linked list of Mandos servers the client
2218
has seen */
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2225
}
2226
}
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
2233
1735
errno = 0;
2234
1736
ret = seteuid(0);
2235
1737
if(ret == -1){
2236
perror_plus("seteuid");
1738
perror("seteuid");
2237
1739
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
1740
if(geteuid() == 0){
2241
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
1742
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
2245
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
1747
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2249
1749
}
2250
1750
}
2251
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
1752
if(ret == -1){
2253
perror_plus("close");
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
2254
1760
}
2255
1761
}
2256
1762
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
1763
2264
/* Removes the GPGME temp directory and all files inside */
1764
/* Removes the temp directory used by GPGME */
2265
1765
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
2273
1786
char *fullname = NULL;
2274
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
1788
direntry->d_name);
2276
1789
if(ret < 0){
2277
perror_plus("asprintf");
1790
perror("asprintf");
2278
1791
continue;
2279
1792
}
2280
1793
ret = remove(fullname);
2281
1794
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
2284
1797
}
2285
1798
free(fullname);
2286
1799
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
1800
closedir(d);
2293
1801
}
2294
1802
ret = rmdir(tempdir);
2295
1803
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
1804
perror("rmdir");
2297
1805
}
2298
1806
}
2299
1807
2304
1812
&old_sigterm_action,
2305
1813
NULL));
2306
1814
if(ret == -1){
2307
perror_plus("sigaction");
1815
perror("sigaction");
2308
1816
}
2309
1817
do {
2310
1818
ret = raise(signal_received);
2311
1819
} while(ret != 0 and errno == EINTR);
2312
1820
if(ret != 0){
2313
perror_plus("raise");
1821
perror("raise");
2314
1822
abort();
2315
1823
}
2316
1824
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0