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- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- files added:
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
135
static const char sys_class_net[] = "/sys/class/net";
131
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
132
149
133
150
/* Used for passing in values through the Avahi callback functions */
134
151
typedef struct {
139
156
gnutls_dh_params_t dh_params;
140
157
const char *priority;
141
158
gpgme_ctx_t ctx;
159
server *current_server;
142
160
} mandos_context;
143
161
144
162
/* global context so signal handler can reach it*/
145
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
164
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
148
167
149
168
sig_atomic_t quit_now = 0;
150
169
int signal_received = 0;
151
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
152
188
/*
153
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
190
* bytes. "buffer_capacity" is how much is currently allocated,
155
191
* "buffer_length" is how much is already used.
156
192
*/
157
193
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
194
size_t buffer_capacity){
159
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
197
if(buffer == NULL){
166
202
return buffer_capacity;
167
203
}
168
204
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
208
int ret;
209
server *new_server = malloc(sizeof(server));
210
if(new_server == NULL){
211
perror_plus("malloc");
212
return false;
213
}
214
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
218
if(new_server->ip == NULL){
219
perror_plus("strdup");
220
return false;
221
}
222
/* Special case of first server */
223
if (mc.current_server == NULL){
224
new_server->next = new_server;
225
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
228
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
231
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
238
}
239
return true;
240
}
241
169
242
/*
170
243
* Initialize GPGME.
171
244
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
174
247
gpgme_error_t rc;
175
248
gpgme_engine_info_t engine_info;
176
249
185
258
186
259
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
260
if(fd == -1){
188
perror("open");
261
perror_plus("open");
189
262
return false;
190
263
}
191
264
192
265
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
266
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
196
269
return false;
197
270
}
198
271
199
272
rc = gpgme_op_import(mc.ctx, pgp_data);
200
273
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
203
276
return false;
204
277
}
205
278
206
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
280
if(ret == -1){
208
perror("close");
281
perror_plus("close");
209
282
}
210
283
gpgme_data_release(pgp_data);
211
284
return true;
212
285
}
213
286
214
287
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
288
fprintf_plus(stderr, "Initializing GPGME\n");
216
289
}
217
290
218
291
/* Init GPGME */
219
292
gpgme_check_version(NULL);
220
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
294
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
224
297
return false;
225
298
}
226
299
227
/* Set GPGME home directory for the OpenPGP engine only */
300
/* Set GPGME home directory for the OpenPGP engine only */
228
301
rc = gpgme_get_engine_info(&engine_info);
229
302
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
232
305
return false;
233
306
}
234
307
while(engine_info != NULL){
240
313
engine_info = engine_info->next;
241
314
}
242
315
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
244
318
return false;
245
319
}
246
320
247
321
/* Create new GPGME "context" */
248
322
rc = gpgme_new(&(mc.ctx));
249
323
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
252
327
return false;
253
328
}
254
329
273
348
ssize_t plaintext_length = 0;
274
349
275
350
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
352
}
278
353
279
354
/* Create new GPGME data buffer from memory cryptotext */
280
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
356
0);
282
357
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
285
360
return -1;
286
361
}
287
362
288
363
/* Create new empty GPGME data buffer for the plaintext */
289
364
rc = gpgme_data_new(&dh_plain);
290
365
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
293
369
gpgme_data_release(dh_crypto);
294
370
return -1;
295
371
}
298
374
data buffer */
299
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
376
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
303
379
plaintext_length = -1;
304
380
if(debug){
305
381
gpgme_decrypt_result_t result;
306
382
result = gpgme_op_decrypt_result(mc.ctx);
307
383
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
385
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
314
390
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
392
}
317
393
gpgme_recipient_t recipient;
318
394
recipient = result->recipients;
319
395
while(recipient != NULL){
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");
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
326
403
recipient = recipient->next;
327
404
}
328
405
}
331
408
}
332
409
333
410
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
412
}
336
413
337
414
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
415
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
416
perror_plus("gpgme_data_seek");
340
417
plaintext_length = -1;
341
418
goto decrypt_end;
342
419
}
344
421
*plaintext = NULL;
345
422
while(true){
346
423
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
424
(size_t)plaintext_length,
425
plaintext_capacity);
349
426
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
353
430
}
354
431
355
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
437
break;
361
438
}
362
439
if(ret < 0){
363
perror("gpgme_data_read");
440
perror_plus("gpgme_data_read");
364
441
plaintext_length = -1;
365
442
goto decrypt_end;
366
443
}
368
445
}
369
446
370
447
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
448
fprintf_plus(stderr, "Decrypted password is: ");
372
449
for(ssize_t i = 0; i < plaintext_length; i++){
373
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
451
}
396
473
/* GnuTLS log function callback */
397
474
static void debuggnutls(__attribute__((unused)) int level,
398
475
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
400
477
}
401
478
402
479
static int init_gnutls_global(const char *pubkeyfilename,
404
481
int ret;
405
482
406
483
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
485
}
409
486
410
487
ret = gnutls_global_init();
411
488
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
414
491
return -1;
415
492
}
416
493
423
500
}
424
501
425
502
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
504
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
433
507
gnutls_global_deinit();
434
508
return -1;
435
509
}
436
510
437
511
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
441
516
}
442
517
443
518
ret = gnutls_certificate_set_openpgp_key_file
444
519
(mc.cred, pubkeyfilename, seckeyfilename,
445
520
GNUTLS_OPENPGP_FMT_BASE64);
446
521
if(ret != GNUTLS_E_SUCCESS){
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));
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
452
527
goto globalfail;
453
528
}
454
529
455
530
/* GnuTLS server initialization */
456
531
ret = gnutls_dh_params_init(&mc.dh_params);
457
532
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
460
536
goto globalfail;
461
537
}
462
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
539
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
466
542
goto globalfail;
467
543
}
468
544
488
564
}
489
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
566
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
493
570
}
494
571
495
572
{
502
579
}
503
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
581
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
508
585
gnutls_deinit(*session);
509
586
return -1;
510
587
}
519
596
}
520
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
598
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
524
601
gnutls_deinit(*session);
525
602
return -1;
526
603
}
571
648
pf = PF_INET;
572
649
break;
573
650
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
652
errno = EINVAL;
576
653
return -1;
577
654
}
582
659
}
583
660
584
661
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
587
664
}
588
665
589
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
667
if(tcp_sd < 0){
591
668
int e = errno;
592
perror("socket");
669
perror_plus("socket");
593
670
errno = e;
594
671
goto mandos_end;
595
672
}
609
686
}
610
687
if(ret < 0 ){
611
688
int e = errno;
612
perror("inet_pton");
689
perror_plus("inet_pton");
613
690
errno = e;
614
691
goto mandos_end;
615
692
}
616
693
if(ret == 0){
617
694
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
696
errno = e;
620
697
goto mandos_end;
621
698
}
626
703
627
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
706
-Wunreachable-code*/
630
707
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
633
710
errno = EINVAL;
634
711
goto mandos_end;
635
712
}
651
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
729
char interface[IF_NAMESIZE];
653
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
731
perror_plus("if_indextoname");
655
732
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
658
735
}
659
736
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
662
739
}
663
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
748
sizeof(addrstr));
672
749
}
673
750
if(pcret == NULL){
674
perror("inet_ntop");
751
perror_plus("inet_ntop");
675
752
} else {
676
753
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
755
}
679
756
}
680
757
}
692
769
if(ret < 0){
693
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
771
int e = errno;
695
perror("connect");
772
perror_plus("connect");
696
773
errno = e;
697
774
}
698
775
goto mandos_end;
708
785
while(true){
709
786
size_t out_size = strlen(out);
710
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
788
out_size - written));
712
789
if(ret == -1){
713
790
int e = errno;
714
perror("write");
791
perror_plus("write");
715
792
errno = e;
716
793
goto mandos_end;
717
794
}
734
811
}
735
812
736
813
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
815
}
739
816
740
817
if(quit_now){
742
819
goto mandos_end;
743
820
}
744
821
822
/* Spurious warning from -Wint-to-pointer-cast */
745
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
824
747
825
if(quit_now){
759
837
760
838
if(ret != GNUTLS_E_SUCCESS){
761
839
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
841
gnutls_perror(ret);
764
842
}
765
843
errno = EPROTO;
769
847
/* Read OpenPGP packet that contains the wanted password */
770
848
771
849
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
774
852
}
775
853
776
854
while(true){
781
859
}
782
860
783
861
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
862
buffer_capacity);
785
863
if(buffer_capacity == 0){
786
864
int e = errno;
787
perror("incbuffer");
865
perror_plus("incbuffer");
788
866
errno = e;
789
867
goto mandos_end;
790
868
}
814
892
}
815
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
894
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
818
897
gnutls_perror(ret);
819
898
errno = EPROTO;
820
899
goto mandos_end;
821
900
}
822
901
break;
823
902
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
826
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
906
errno = EIO;
828
907
goto mandos_end;
833
912
}
834
913
835
914
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
915
fprintf_plus(stderr, "Closing TLS session\n");
837
916
}
838
917
839
918
if(quit_now){
851
930
852
931
if(buffer_length > 0){
853
932
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
856
934
&decrypted_buffer);
857
935
if(decrypted_buffer_size >= 0){
858
936
869
947
if(ret == 0 and ferror(stdout)){
870
948
int e = errno;
871
949
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
874
952
}
875
953
errno = e;
876
954
goto mandos_end;
895
973
if(e == 0){
896
974
e = errno;
897
975
}
898
perror("close");
976
perror_plus("close");
899
977
}
900
978
gnutls_deinit(session);
979
errno = e;
901
980
if(quit_now){
902
e = EINTR;
981
errno = EINTR;
903
982
retval = -1;
904
983
}
905
errno = e;
906
984
}
907
985
return retval;
908
986
}
933
1011
switch(event){
934
1012
default:
935
1013
case AVAHI_RESOLVER_FAILURE:
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)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
939
1018
break;
940
1019
941
1020
case AVAHI_RESOLVER_FOUND:
943
1022
char ip[AVAHI_ADDRESS_STR_MAX];
944
1023
avahi_address_snprint(ip, sizeof(ip), address);
945
1024
if(debug){
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);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
949
1028
}
950
1029
int ret = start_mandos_communication(ip, port, interface,
951
1030
avahi_proto_to_af(proto));
952
1031
if(ret == 0){
953
1032
avahi_simple_poll_quit(mc.simple_poll);
1033
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
954
1039
}
955
1040
}
956
1041
}
980
1065
default:
981
1066
case AVAHI_BROWSER_FAILURE:
982
1067
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
985
1070
avahi_simple_poll_quit(mc.simple_poll);
986
1071
return;
987
1072
994
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
1080
name, type, domain, protocol, 0,
996
1081
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
999
1085
break;
1000
1086
1001
1087
case AVAHI_BROWSER_REMOVE:
1004
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1092
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
1008
1095
}
1009
1096
break;
1010
1097
}
1011
1098
}
1012
1099
1013
/* stop main loop after sigterm has been called */
1100
/* Signal handler that stops main loop after SIGTERM */
1014
1101
static void handle_sigterm(int sig){
1015
1102
if(quit_now){
1016
1103
return;
1018
1105
quit_now = 1;
1019
1106
signal_received = sig;
1020
1107
int old_errno = errno;
1108
/* set main loop to exit */
1021
1109
if(mc.simple_poll != NULL){
1022
1110
avahi_simple_poll_quit(mc.simple_poll);
1023
1111
}
1024
1112
errno = old_errno;
1025
1113
}
1026
1114
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){
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1081
1126
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1127
perror_plus("ioctl SIOCGIFFLAGS");
1084
1128
}
1085
free(flagstring);
1086
return 0;
1129
return false;
1087
1130
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1090
1136
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1092
1138
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1095
1141
}
1096
return 0;
1142
return false;
1097
1143
}
1098
1144
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1100
1146
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1103
1149
}
1104
return 1;
1150
return true;
1105
1151
}
1106
1152
/* Otherwise, reject non-broadcast-capable devices */
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
}
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1157
}
1158
return false;
1159
}
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1162
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1165
}
1166
return false;
1167
}
1168
1114
1169
/* Accept this device */
1115
1170
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
int ret;
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1321
1322
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1327
}
1328
ret = avahi_simple_poll_iterate(s, -1);
1329
} else {
1330
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1333
}
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
if(ret == -1){
1337
perror_plus("clock_gettime");
1338
return -1;
1339
}
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1353
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1356
}
1357
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1363
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1365
return 0;
1366
}
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1376
}
1377
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
}
1380
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1383
}
1384
}
1385
}
1386
}
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1120
1515
}
1121
1516
1122
1517
int main(int argc, char *argv[]){
1141
1536
bool gnutls_initialized = false;
1142
1537
bool gpgme_initialized = false;
1143
1538
float delay = 2.5f;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1144
1541
1145
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1549
errno = 0;
1153
1550
ret = setgid(gid);
1154
1551
if(ret == -1){
1155
perror("setgid");
1552
perror_plus("setgid");
1156
1553
}
1157
1554
1158
1555
/* Lower user privileges (temporarily) */
1159
1556
errno = 0;
1160
1557
ret = seteuid(uid);
1161
1558
if(ret == -1){
1162
perror("seteuid");
1559
perror_plus("seteuid");
1163
1560
}
1164
1561
1165
1562
if(quit_now){
1200
1597
.arg = "SECONDS",
1201
1598
.doc = "Maximum delay to wait for interface startup",
1202
1599
.group = 2 },
1600
{ .name = "retry", .key = 132,
1601
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1203
1608
/*
1204
1609
* These reproduce what we would get without ARGP_NO_HELP
1205
1610
*/
1249
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1655
argp_error(state, "Bad delay");
1251
1656
}
1657
case 132: /* --retry */
1658
errno = 0;
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1664
}
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1252
1668
break;
1253
1669
/*
1254
1670
* These reproduce what we would get without ARGP_NO_HELP
1261
1677
argp_state_help(state, state->out_stream,
1262
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1679
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1681
exit(argp_err_exit_status);
1266
1682
break;
1267
1683
default:
1282
1698
case ENOMEM:
1283
1699
default:
1284
1700
errno = ret;
1285
perror("argp_parse");
1701
perror_plus("argp_parse");
1286
1702
exitcode = EX_OSERR;
1287
1703
goto end;
1288
1704
case EINVAL:
1290
1706
goto end;
1291
1707
}
1292
1708
}
1709
1710
{
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1713
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1776
}
1293
1777
1294
1778
if(not debug){
1295
1779
avahi_set_log_function(empty_log);
1296
1780
}
1297
1781
1298
1782
if(interface[0] == '\0'){
1299
1783
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1301
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1302
1793
if(ret >= 1){
1303
/* Pick the first good interface */
1794
/* Pick the first interface returned */
1304
1795
interface = strdup(direntries[0]->d_name);
1305
1796
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1307
1798
}
1308
1799
if(interface == NULL){
1309
perror("malloc");
1800
perror_plus("malloc");
1310
1801
free(direntries);
1311
1802
exitcode = EXIT_FAILURE;
1312
1803
goto end;
1314
1805
free(direntries);
1315
1806
} else {
1316
1807
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1318
1809
exitcode = EXIT_FAILURE;
1319
1810
goto end;
1320
1811
}
1326
1817
srand((unsigned int) time(NULL));
1327
1818
mc.simple_poll = avahi_simple_poll_new();
1328
1819
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1330
1822
exitcode = EX_UNAVAILABLE;
1331
1823
goto end;
1332
1824
}
1334
1826
sigemptyset(&sigterm_action.sa_mask);
1335
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
1828
if(ret == -1){
1337
perror("sigaddset");
1829
perror_plus("sigaddset");
1338
1830
exitcode = EX_OSERR;
1339
1831
goto end;
1340
1832
}
1341
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
1834
if(ret == -1){
1343
perror("sigaddset");
1835
perror_plus("sigaddset");
1344
1836
exitcode = EX_OSERR;
1345
1837
goto end;
1346
1838
}
1347
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
1840
if(ret == -1){
1349
perror("sigaddset");
1841
perror_plus("sigaddset");
1350
1842
exitcode = EX_OSERR;
1351
1843
goto end;
1352
1844
}
1356
1848
*/
1357
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
1850
if(ret == -1){
1359
perror("sigaction");
1851
perror_plus("sigaction");
1360
1852
return EX_OSERR;
1361
1853
}
1362
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
1856
if(ret == -1){
1365
perror("sigaction");
1857
perror_plus("sigaction");
1366
1858
exitcode = EX_OSERR;
1367
1859
goto end;
1368
1860
}
1369
1861
}
1370
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
1863
if(ret == -1){
1372
perror("sigaction");
1864
perror_plus("sigaction");
1373
1865
return EX_OSERR;
1374
1866
}
1375
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
1869
if(ret == -1){
1378
perror("sigaction");
1870
perror_plus("sigaction");
1379
1871
exitcode = EX_OSERR;
1380
1872
goto end;
1381
1873
}
1382
1874
}
1383
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
1876
if(ret == -1){
1385
perror("sigaction");
1877
perror_plus("sigaction");
1386
1878
return EX_OSERR;
1387
1879
}
1388
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
1882
if(ret == -1){
1391
perror("sigaction");
1883
perror_plus("sigaction");
1392
1884
exitcode = EX_OSERR;
1393
1885
goto end;
1394
1886
}
1398
1890
if(strcmp(interface, "none") != 0){
1399
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
1892
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1402
1894
exitcode = EX_UNAVAILABLE;
1403
1895
goto end;
1404
1896
}
1411
1903
errno = 0;
1412
1904
ret = seteuid(0);
1413
1905
if(ret == -1){
1414
perror("seteuid");
1906
perror_plus("seteuid");
1415
1907
}
1416
1908
1417
1909
#ifdef __linux__
1421
1913
bool restore_loglevel = true;
1422
1914
if(ret == -1){
1423
1915
restore_loglevel = false;
1424
perror("klogctl");
1916
perror_plus("klogctl");
1425
1917
}
1426
1918
#endif /* __linux__ */
1427
1919
1428
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1921
if(sd < 0){
1430
perror("socket");
1922
perror_plus("socket");
1431
1923
exitcode = EX_OSERR;
1432
1924
#ifdef __linux__
1433
1925
if(restore_loglevel){
1434
1926
ret = klogctl(7, NULL, 0);
1435
1927
if(ret == -1){
1436
perror("klogctl");
1928
perror_plus("klogctl");
1437
1929
}
1438
1930
}
1439
1931
#endif /* __linux__ */
1441
1933
errno = 0;
1442
1934
ret = seteuid(uid);
1443
1935
if(ret == -1){
1444
perror("seteuid");
1936
perror_plus("seteuid");
1445
1937
}
1446
1938
goto end;
1447
1939
}
1448
1940
strcpy(network.ifr_name, interface);
1449
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
1942
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1943
perror_plus("ioctl SIOCGIFFLAGS");
1452
1944
#ifdef __linux__
1453
1945
if(restore_loglevel){
1454
1946
ret = klogctl(7, NULL, 0);
1455
1947
if(ret == -1){
1456
perror("klogctl");
1948
perror_plus("klogctl");
1457
1949
}
1458
1950
}
1459
1951
#endif /* __linux__ */
1462
1954
errno = 0;
1463
1955
ret = seteuid(uid);
1464
1956
if(ret == -1){
1465
perror("seteuid");
1957
perror_plus("seteuid");
1466
1958
}
1467
1959
goto end;
1468
1960
}
1472
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1965
if(ret == -1){
1474
1966
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1476
1968
exitcode = EX_OSERR;
1477
1969
#ifdef __linux__
1478
1970
if(restore_loglevel){
1479
1971
ret = klogctl(7, NULL, 0);
1480
1972
if(ret == -1){
1481
perror("klogctl");
1973
perror_plus("klogctl");
1482
1974
}
1483
1975
}
1484
1976
#endif /* __linux__ */
1486
1978
errno = 0;
1487
1979
ret = seteuid(uid);
1488
1980
if(ret == -1){
1489
perror("seteuid");
1981
perror_plus("seteuid");
1490
1982
}
1491
1983
goto end;
1492
1984
}
1493
1985
}
1494
/* sleep checking until interface is running */
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1495
1988
for(int i=0; i < delay * 4; i++){
1496
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
1990
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1991
perror_plus("ioctl SIOCGIFFLAGS");
1499
1992
} else if(network.ifr_flags & IFF_RUNNING){
1500
1993
break;
1501
1994
}
1502
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
1996
ret = nanosleep(&sleeptime, NULL);
1504
1997
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1998
perror_plus("nanosleep");
1506
1999
}
1507
2000
}
1508
2001
if(not take_down_interface){
1509
2002
/* We won't need the socket anymore */
1510
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
2004
if(ret == -1){
1512
perror("close");
2005
perror_plus("close");
1513
2006
}
1514
2007
}
1515
2008
#ifdef __linux__
1517
2010
/* Restores kernel loglevel to default */
1518
2011
ret = klogctl(7, NULL, 0);
1519
2012
if(ret == -1){
1520
perror("klogctl");
2013
perror_plus("klogctl");
1521
2014
}
1522
2015
}
1523
2016
#endif /* __linux__ */
1524
2017
/* Lower privileges */
1525
2018
errno = 0;
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
}
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
1538
2023
}
1539
2024
}
1540
2025
1544
2029
1545
2030
ret = init_gnutls_global(pubkey, seckey);
1546
2031
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2033
exitcode = EX_UNAVAILABLE;
1549
2034
goto end;
1550
2035
} else {
1555
2040
goto end;
1556
2041
}
1557
2042
2043
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
2045
goto end;
2046
}
1558
2047
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2048
1565
2049
if(quit_now){
1566
2050
goto end;
1567
2051
}
1568
2052
1569
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2054
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2055
exitcode = EX_UNAVAILABLE;
1572
2056
goto end;
1573
2057
} else {
1583
2067
/* (Mainly meant for debugging) */
1584
2068
char *address = strrchr(connect_to, ':');
1585
2069
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2070
fprintf_plus(stderr, "No colon in address\n");
1587
2071
exitcode = EX_USAGE;
1588
2072
goto end;
1589
2073
}
1597
2081
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
2083
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2084
fprintf_plus(stderr, "Bad port number\n");
1601
2085
exitcode = EX_USAGE;
1602
2086
goto end;
1603
2087
}
1608
2092
1609
2093
port = (uint16_t)tmpmax;
1610
2094
*address = '\0';
1611
address = connect_to;
1612
2095
/* Colon in address indicates IPv6 */
1613
2096
int af;
1614
if(strchr(address, ':') != NULL){
2097
if(strchr(connect_to, ':') != NULL){
1615
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
1616
2105
} else {
1617
2106
af = AF_INET;
1618
2107
}
2108
address = connect_to;
1619
2109
1620
2110
if(quit_now){
1621
2111
goto end;
1622
2112
}
1623
2113
1624
2114
while(not quit_now){
1625
2115
ret = start_mandos_communication(address, port, if_index, af);
1626
2116
if(quit_now or ret == 0){
1627
2117
break;
1628
2118
}
1629
sleep(15);
1630
};
1631
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
1632
2126
if (not quit_now){
1633
2127
exitcode = EXIT_SUCCESS;
1634
2128
}
1635
2129
1636
2130
goto end;
1637
2131
}
1638
2132
1660
2154
1661
2155
/* Check if creating the Avahi server object succeeded */
1662
2156
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
1665
2159
exitcode = EX_UNAVAILABLE;
1666
2160
goto end;
1667
2161
}
1675
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
2170
NULL, 0, browse_callback, NULL);
1677
2171
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
1680
2174
exitcode = EX_UNAVAILABLE;
1681
2175
goto end;
1682
2176
}
1688
2182
/* Run the main loop */
1689
2183
1690
2184
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2190
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
2193
}
1695
2194
1696
2195
end:
1697
2196
1698
2197
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2199
}
1701
2200
1702
2201
/* Cleanup things */
1719
2218
gpgme_release(mc.ctx);
1720
2219
}
1721
2220
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
2221
/* Cleans up the circular linked list of Mandos servers the client
2222
has seen */
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2229
}
2230
}
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
1725
2237
errno = 0;
1726
2238
ret = seteuid(0);
1727
2239
if(ret == -1){
1728
perror("seteuid");
2240
perror_plus("seteuid");
1729
2241
}
1730
if(geteuid() == 0){
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
1731
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
2246
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
1735
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
2251
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1739
2253
}
1740
2254
}
1741
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
2256
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2257
perror_plus("close");
1750
2258
}
1751
2259
}
1752
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
1753
2267
1754
/* Removes the temp directory used by GPGME */
2268
/* Removes the GPGME temp directory and all files inside */
1755
2269
if(tempdir_created){
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
}
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
1776
2277
char *fullname = NULL;
1777
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2279
direntry->d_name);
1779
2280
if(ret < 0){
1780
perror("asprintf");
2281
perror_plus("asprintf");
1781
2282
continue;
1782
2283
}
1783
2284
ret = remove(fullname);
1784
2285
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
1787
2288
}
1788
2289
free(fullname);
1789
2290
}
1790
closedir(d);
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
1791
2297
}
1792
2298
ret = rmdir(tempdir);
1793
2299
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2300
perror_plus("rmdir");
1795
2301
}
1796
2302
}
1797
2303
1802
2308
&old_sigterm_action,
1803
2309
NULL));
1804
2310
if(ret == -1){
1805
perror("sigaction");
2311
perror_plus("sigaction");
1806
2312
}
1807
2313
do {
1808
2314
ret = raise(signal_received);
1809
2315
} while(ret != 0 and errno == EINTR);
1810
2316
if(ret != 0){
1811
perror("raise");
2317
perror_plus("raise");
1812
2318
abort();
1813
2319
}
1814
2320
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0