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- Committer: Teddy Hogeborn
- Date: 2012-05-06 17:37:23 UTC
- Revision ID: teddy@recompile.se-20120506173723-znhgx61gpqp1rfor
* mandos (main.cleanup): Use tempfile.NamedTemporaryFile() instead of
tempfile.mkstemp().
tempfile.mkstemp().
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
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
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
152
190
/*
153
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
192
* bytes. "buffer_capacity" is how much is currently allocated,
155
193
* "buffer_length" is how much is already used.
156
194
*/
157
195
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
196
size_t buffer_capacity){
159
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
199
if(buffer == NULL){
166
204
return buffer_capacity;
167
205
}
168
206
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
169
244
/*
170
245
* Initialize GPGME.
171
246
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
174
249
gpgme_error_t rc;
175
250
gpgme_engine_info_t engine_info;
176
251
185
260
186
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
262
if(fd == -1){
188
perror("open");
263
perror_plus("open");
189
264
return false;
190
265
}
191
266
192
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
268
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));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
196
271
return false;
197
272
}
198
273
199
274
rc = gpgme_op_import(mc.ctx, pgp_data);
200
275
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
203
278
return false;
204
279
}
205
280
206
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
282
if(ret == -1){
208
perror("close");
283
perror_plus("close");
209
284
}
210
285
gpgme_data_release(pgp_data);
211
286
return true;
212
287
}
213
288
214
289
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
216
291
}
217
292
218
293
/* Init GPGME */
219
294
gpgme_check_version(NULL);
220
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
296
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
224
299
return false;
225
300
}
226
301
227
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
228
303
rc = gpgme_get_engine_info(&engine_info);
229
304
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
232
307
return false;
233
308
}
234
309
while(engine_info != NULL){
240
315
engine_info = engine_info->next;
241
316
}
242
317
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
244
320
return false;
245
321
}
246
322
247
323
/* Create new GPGME "context" */
248
324
rc = gpgme_new(&(mc.ctx));
249
325
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
252
329
return false;
253
330
}
254
331
273
350
ssize_t plaintext_length = 0;
274
351
275
352
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
354
}
278
355
279
356
/* Create new GPGME data buffer from memory cryptotext */
280
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
358
0);
282
359
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));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
285
362
return -1;
286
363
}
287
364
288
365
/* Create new empty GPGME data buffer for the plaintext */
289
366
rc = gpgme_data_new(&dh_plain);
290
367
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
293
371
gpgme_data_release(dh_crypto);
294
372
return -1;
295
373
}
298
376
data buffer */
299
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
378
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
303
381
plaintext_length = -1;
304
382
if(debug){
305
383
gpgme_decrypt_result_t result;
306
384
result = gpgme_op_decrypt_result(mc.ctx);
307
385
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
387
} 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);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
314
392
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
394
}
317
395
gpgme_recipient_t recipient;
318
396
recipient = result->recipients;
319
397
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");
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
326
405
recipient = recipient->next;
327
406
}
328
407
}
331
410
}
332
411
333
412
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
414
}
336
415
337
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
418
perror_plus("gpgme_data_seek");
340
419
plaintext_length = -1;
341
420
goto decrypt_end;
342
421
}
344
423
*plaintext = NULL;
345
424
while(true){
346
425
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
349
428
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
353
432
}
354
433
355
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
439
break;
361
440
}
362
441
if(ret < 0){
363
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
364
443
plaintext_length = -1;
365
444
goto decrypt_end;
366
445
}
368
447
}
369
448
370
449
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
372
451
for(ssize_t i = 0; i < plaintext_length; i++){
373
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
453
}
396
475
/* GnuTLS log function callback */
397
476
static void debuggnutls(__attribute__((unused)) int level,
398
477
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
400
479
}
401
480
402
481
static int init_gnutls_global(const char *pubkeyfilename,
404
483
int ret;
405
484
406
485
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
487
}
409
488
410
489
ret = gnutls_global_init();
411
490
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
414
493
return -1;
415
494
}
416
495
423
502
}
424
503
425
504
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
506
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));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
433
509
gnutls_global_deinit();
434
510
return -1;
435
511
}
436
512
437
513
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
441
518
}
442
519
443
520
ret = gnutls_certificate_set_openpgp_key_file
444
521
(mc.cred, pubkeyfilename, seckeyfilename,
445
522
GNUTLS_OPENPGP_FMT_BASE64);
446
523
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));
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
452
529
goto globalfail;
453
530
}
454
531
455
532
/* GnuTLS server initialization */
456
533
ret = gnutls_dh_params_init(&mc.dh_params);
457
534
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
460
538
goto globalfail;
461
539
}
462
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
541
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
466
544
goto globalfail;
467
545
}
468
546
488
566
}
489
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
568
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
493
572
}
494
573
495
574
{
502
581
}
503
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
583
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));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
508
587
gnutls_deinit(*session);
509
588
return -1;
510
589
}
519
598
}
520
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
600
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
524
603
gnutls_deinit(*session);
525
604
return -1;
526
605
}
571
650
pf = PF_INET;
572
651
break;
573
652
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
654
errno = EINVAL;
576
655
return -1;
577
656
}
582
661
}
583
662
584
663
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
587
666
}
588
667
589
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
669
if(tcp_sd < 0){
591
670
int e = errno;
592
perror("socket");
671
perror_plus("socket");
593
672
errno = e;
594
673
goto mandos_end;
595
674
}
609
688
}
610
689
if(ret < 0 ){
611
690
int e = errno;
612
perror("inet_pton");
691
perror_plus("inet_pton");
613
692
errno = e;
614
693
goto mandos_end;
615
694
}
616
695
if(ret == 0){
617
696
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
698
errno = e;
620
699
goto mandos_end;
621
700
}
626
705
627
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
708
-Wunreachable-code*/
630
709
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
633
712
errno = EINVAL;
634
713
goto mandos_end;
635
714
}
651
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
731
char interface[IF_NAMESIZE];
653
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
733
perror_plus("if_indextoname");
655
734
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
658
737
}
659
738
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
662
741
}
663
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
750
sizeof(addrstr));
672
751
}
673
752
if(pcret == NULL){
674
perror("inet_ntop");
753
perror_plus("inet_ntop");
675
754
} else {
676
755
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
757
}
679
758
}
680
759
}
690
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
770
}
692
771
if(ret < 0){
693
int e = errno;
694
perror("connect");
695
errno = e;
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
696
777
goto mandos_end;
697
778
}
698
779
706
787
while(true){
707
788
size_t out_size = strlen(out);
708
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
out_size - written));
790
out_size - written));
710
791
if(ret == -1){
711
792
int e = errno;
712
perror("write");
793
perror_plus("write");
713
794
errno = e;
714
795
goto mandos_end;
715
796
}
732
813
}
733
814
734
815
if(debug){
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
736
817
}
737
818
738
819
if(quit_now){
740
821
goto mandos_end;
741
822
}
742
823
824
/* Spurious warning from -Wint-to-pointer-cast */
743
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
826
745
827
if(quit_now){
757
839
758
840
if(ret != GNUTLS_E_SUCCESS){
759
841
if(debug){
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
761
843
gnutls_perror(ret);
762
844
}
763
845
errno = EPROTO;
767
849
/* Read OpenPGP packet that contains the wanted password */
768
850
769
851
if(debug){
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
772
854
}
773
855
774
856
while(true){
779
861
}
780
862
781
863
buffer_capacity = incbuffer(&buffer, buffer_length,
782
buffer_capacity);
864
buffer_capacity);
783
865
if(buffer_capacity == 0){
784
866
int e = errno;
785
perror("incbuffer");
867
perror_plus("incbuffer");
786
868
errno = e;
787
869
goto mandos_end;
788
870
}
812
894
}
813
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
896
if(ret < 0){
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
816
899
gnutls_perror(ret);
817
900
errno = EPROTO;
818
901
goto mandos_end;
819
902
}
820
903
break;
821
904
default:
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
824
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
908
errno = EIO;
826
909
goto mandos_end;
831
914
}
832
915
833
916
if(debug){
834
fprintf(stderr, "Closing TLS session\n");
917
fprintf_plus(stderr, "Closing TLS session\n");
835
918
}
836
919
837
920
if(quit_now){
849
932
850
933
if(buffer_length > 0){
851
934
ssize_t decrypted_buffer_size;
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
936
&decrypted_buffer);
855
937
if(decrypted_buffer_size >= 0){
856
938
867
949
if(ret == 0 and ferror(stdout)){
868
950
int e = errno;
869
951
if(debug){
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
872
954
}
873
955
errno = e;
874
956
goto mandos_end;
893
975
if(e == 0){
894
976
e = errno;
895
977
}
896
perror("close");
978
perror_plus("close");
897
979
}
898
980
gnutls_deinit(session);
981
errno = e;
899
982
if(quit_now){
900
e = EINTR;
983
errno = EINTR;
901
984
retval = -1;
902
985
}
903
errno = e;
904
986
}
905
987
return retval;
906
988
}
931
1013
switch(event){
932
1014
default:
933
1015
case AVAHI_RESOLVER_FAILURE:
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
937
1020
break;
938
1021
939
1022
case AVAHI_RESOLVER_FOUND:
941
1024
char ip[AVAHI_ADDRESS_STR_MAX];
942
1025
avahi_address_snprint(ip, sizeof(ip), address);
943
1026
if(debug){
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
947
1030
}
948
1031
int ret = start_mandos_communication(ip, port, interface,
949
1032
avahi_proto_to_af(proto));
950
1033
if(ret == 0){
951
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
952
1041
}
953
1042
}
954
1043
}
978
1067
default:
979
1068
case AVAHI_BROWSER_FAILURE:
980
1069
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
983
1072
avahi_simple_poll_quit(mc.simple_poll);
984
1073
return;
985
1074
992
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
1082
name, type, domain, protocol, 0,
994
1083
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
997
1087
break;
998
1088
999
1089
case AVAHI_BROWSER_REMOVE:
1002
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1003
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1004
1094
if(debug){
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1006
1097
}
1007
1098
break;
1008
1099
}
1009
1100
}
1010
1101
1011
/* stop main loop after sigterm has been called */
1102
/* Signal handler that stops main loop after SIGTERM */
1012
1103
static void handle_sigterm(int sig){
1013
1104
if(quit_now){
1014
1105
return;
1016
1107
quit_now = 1;
1017
1108
signal_received = sig;
1018
1109
int old_errno = errno;
1110
/* set main loop to exit */
1019
1111
if(mc.simple_poll != NULL){
1020
1112
avahi_simple_poll_quit(mc.simple_poll);
1021
1113
}
1022
1114
errno = old_errno;
1023
1115
}
1024
1116
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1079
1128
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1129
perror_plus("ioctl SIOCGIFFLAGS");
1082
1130
}
1083
free(flagstring);
1084
return 0;
1131
return false;
1085
1132
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1088
1138
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1090
1140
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1093
1143
}
1094
return 0;
1144
return false;
1095
1145
}
1096
1146
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1098
1148
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1101
1151
}
1102
return 1;
1152
return true;
1103
1153
}
1104
1154
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1112
1171
/* Accept this device */
1113
1172
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1118
1524
}
1119
1525
1120
1526
int main(int argc, char *argv[]){
1139
1545
bool gnutls_initialized = false;
1140
1546
bool gpgme_initialized = false;
1141
1547
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1142
1550
1143
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
1552
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1150
1558
errno = 0;
1151
1559
ret = setgid(gid);
1152
1560
if(ret == -1){
1153
perror("setgid");
1561
perror_plus("setgid");
1154
1562
}
1155
1563
1156
1564
/* Lower user privileges (temporarily) */
1157
1565
errno = 0;
1158
1566
ret = seteuid(uid);
1159
1567
if(ret == -1){
1160
perror("seteuid");
1568
perror_plus("seteuid");
1161
1569
}
1162
1570
1163
1571
if(quit_now){
1198
1606
.arg = "SECONDS",
1199
1607
.doc = "Maximum delay to wait for interface startup",
1200
1608
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1201
1617
/*
1202
1618
* These reproduce what we would get without ARGP_NO_HELP
1203
1619
*/
1247
1663
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
1664
argp_error(state, "Bad delay");
1249
1665
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1250
1677
break;
1251
1678
/*
1252
1679
* These reproduce what we would get without ARGP_NO_HELP
1259
1686
argp_state_help(state, state->out_stream,
1260
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
1688
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1263
1690
exit(argp_err_exit_status);
1264
1691
break;
1265
1692
default:
1280
1707
case ENOMEM:
1281
1708
default:
1282
1709
errno = ret;
1283
perror("argp_parse");
1710
perror_plus("argp_parse");
1284
1711
exitcode = EX_OSERR;
1285
1712
goto end;
1286
1713
case EINVAL:
1288
1715
goto end;
1289
1716
}
1290
1717
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1785
}
1291
1786
1292
1787
if(not debug){
1293
1788
avahi_set_log_function(empty_log);
1294
1789
}
1295
1790
1296
1791
if(interface[0] == '\0'){
1297
1792
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1299
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1300
1802
if(ret >= 1){
1301
/* Pick the first good interface */
1803
/* Pick the first interface returned */
1302
1804
interface = strdup(direntries[0]->d_name);
1303
1805
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1305
1807
}
1306
1808
if(interface == NULL){
1307
perror("malloc");
1809
perror_plus("malloc");
1308
1810
free(direntries);
1309
1811
exitcode = EXIT_FAILURE;
1310
1812
goto end;
1312
1814
free(direntries);
1313
1815
} else {
1314
1816
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1316
1818
exitcode = EXIT_FAILURE;
1317
1819
goto end;
1318
1820
}
1324
1826
srand((unsigned int) time(NULL));
1325
1827
mc.simple_poll = avahi_simple_poll_new();
1326
1828
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1328
1831
exitcode = EX_UNAVAILABLE;
1329
1832
goto end;
1330
1833
}
1332
1835
sigemptyset(&sigterm_action.sa_mask);
1333
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
1837
if(ret == -1){
1335
perror("sigaddset");
1838
perror_plus("sigaddset");
1336
1839
exitcode = EX_OSERR;
1337
1840
goto end;
1338
1841
}
1339
1842
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
1843
if(ret == -1){
1341
perror("sigaddset");
1844
perror_plus("sigaddset");
1342
1845
exitcode = EX_OSERR;
1343
1846
goto end;
1344
1847
}
1345
1848
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
1849
if(ret == -1){
1347
perror("sigaddset");
1850
perror_plus("sigaddset");
1348
1851
exitcode = EX_OSERR;
1349
1852
goto end;
1350
1853
}
1354
1857
*/
1355
1858
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
1859
if(ret == -1){
1357
perror("sigaction");
1860
perror_plus("sigaction");
1358
1861
return EX_OSERR;
1359
1862
}
1360
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
1864
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
1865
if(ret == -1){
1363
perror("sigaction");
1866
perror_plus("sigaction");
1364
1867
exitcode = EX_OSERR;
1365
1868
goto end;
1366
1869
}
1367
1870
}
1368
1871
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
1872
if(ret == -1){
1370
perror("sigaction");
1873
perror_plus("sigaction");
1371
1874
return EX_OSERR;
1372
1875
}
1373
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
1877
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
1878
if(ret == -1){
1376
perror("sigaction");
1879
perror_plus("sigaction");
1377
1880
exitcode = EX_OSERR;
1378
1881
goto end;
1379
1882
}
1380
1883
}
1381
1884
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
1885
if(ret == -1){
1383
perror("sigaction");
1886
perror_plus("sigaction");
1384
1887
return EX_OSERR;
1385
1888
}
1386
1889
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
1890
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
1891
if(ret == -1){
1389
perror("sigaction");
1892
perror_plus("sigaction");
1390
1893
exitcode = EX_OSERR;
1391
1894
goto end;
1392
1895
}
1396
1899
if(strcmp(interface, "none") != 0){
1397
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
1901
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1400
1903
exitcode = EX_UNAVAILABLE;
1401
1904
goto end;
1402
1905
}
1409
1912
errno = 0;
1410
1913
ret = seteuid(0);
1411
1914
if(ret == -1){
1412
perror("seteuid");
1915
perror_plus("seteuid");
1413
1916
}
1414
1917
1415
1918
#ifdef __linux__
1419
1922
bool restore_loglevel = true;
1420
1923
if(ret == -1){
1421
1924
restore_loglevel = false;
1422
perror("klogctl");
1925
perror_plus("klogctl");
1423
1926
}
1424
1927
#endif /* __linux__ */
1425
1928
1426
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
1930
if(sd < 0){
1428
perror("socket");
1931
perror_plus("socket");
1429
1932
exitcode = EX_OSERR;
1430
1933
#ifdef __linux__
1431
1934
if(restore_loglevel){
1432
1935
ret = klogctl(7, NULL, 0);
1433
1936
if(ret == -1){
1434
perror("klogctl");
1937
perror_plus("klogctl");
1435
1938
}
1436
1939
}
1437
1940
#endif /* __linux__ */
1439
1942
errno = 0;
1440
1943
ret = seteuid(uid);
1441
1944
if(ret == -1){
1442
perror("seteuid");
1945
perror_plus("seteuid");
1443
1946
}
1444
1947
goto end;
1445
1948
}
1446
1949
strcpy(network.ifr_name, interface);
1447
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
1951
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1952
perror_plus("ioctl SIOCGIFFLAGS");
1450
1953
#ifdef __linux__
1451
1954
if(restore_loglevel){
1452
1955
ret = klogctl(7, NULL, 0);
1453
1956
if(ret == -1){
1454
perror("klogctl");
1957
perror_plus("klogctl");
1455
1958
}
1456
1959
}
1457
1960
#endif /* __linux__ */
1460
1963
errno = 0;
1461
1964
ret = seteuid(uid);
1462
1965
if(ret == -1){
1463
perror("seteuid");
1966
perror_plus("seteuid");
1464
1967
}
1465
1968
goto end;
1466
1969
}
1470
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
1974
if(ret == -1){
1472
1975
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1474
1977
exitcode = EX_OSERR;
1475
1978
#ifdef __linux__
1476
1979
if(restore_loglevel){
1477
1980
ret = klogctl(7, NULL, 0);
1478
1981
if(ret == -1){
1479
perror("klogctl");
1982
perror_plus("klogctl");
1480
1983
}
1481
1984
}
1482
1985
#endif /* __linux__ */
1484
1987
errno = 0;
1485
1988
ret = seteuid(uid);
1486
1989
if(ret == -1){
1487
perror("seteuid");
1990
perror_plus("seteuid");
1488
1991
}
1489
1992
goto end;
1490
1993
}
1491
1994
}
1492
/* sleep checking until interface is running */
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1493
1997
for(int i=0; i < delay * 4; i++){
1494
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
1999
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
2000
perror_plus("ioctl SIOCGIFFLAGS");
1497
2001
} else if(network.ifr_flags & IFF_RUNNING){
1498
2002
break;
1499
2003
}
1500
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
2005
ret = nanosleep(&sleeptime, NULL);
1502
2006
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
2007
perror_plus("nanosleep");
1504
2008
}
1505
2009
}
1506
2010
if(not take_down_interface){
1507
2011
/* We won't need the socket anymore */
1508
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
2013
if(ret == -1){
1510
perror("close");
2014
perror_plus("close");
1511
2015
}
1512
2016
}
1513
2017
#ifdef __linux__
1515
2019
/* Restores kernel loglevel to default */
1516
2020
ret = klogctl(7, NULL, 0);
1517
2021
if(ret == -1){
1518
perror("klogctl");
2022
perror_plus("klogctl");
1519
2023
}
1520
2024
}
1521
2025
#endif /* __linux__ */
1522
2026
/* Lower privileges */
1523
2027
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1536
2032
}
1537
2033
}
1538
2034
1542
2038
1543
2039
ret = init_gnutls_global(pubkey, seckey);
1544
2040
if(ret == -1){
1545
fprintf(stderr, "init_gnutls_global failed\n");
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1546
2042
exitcode = EX_UNAVAILABLE;
1547
2043
goto end;
1548
2044
} else {
1553
2049
goto end;
1554
2050
}
1555
2051
2052
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
2054
goto end;
2055
}
1556
2056
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
2057
1563
2058
if(quit_now){
1564
2059
goto end;
1565
2060
}
1566
2061
1567
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1569
2064
exitcode = EX_UNAVAILABLE;
1570
2065
goto end;
1571
2066
} else {
1581
2076
/* (Mainly meant for debugging) */
1582
2077
char *address = strrchr(connect_to, ':');
1583
2078
if(address == NULL){
1584
fprintf(stderr, "No colon in address\n");
2079
fprintf_plus(stderr, "No colon in address\n");
1585
2080
exitcode = EX_USAGE;
1586
2081
goto end;
1587
2082
}
1595
2090
tmpmax = strtoimax(address+1, &tmp, 10);
1596
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
2092
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
2093
fprintf_plus(stderr, "Bad port number\n");
1599
2094
exitcode = EX_USAGE;
1600
2095
goto end;
1601
2096
}
1606
2101
1607
2102
port = (uint16_t)tmpmax;
1608
2103
*address = '\0';
1609
address = connect_to;
1610
2104
/* Colon in address indicates IPv6 */
1611
2105
int af;
1612
if(strchr(address, ':') != NULL){
2106
if(strchr(connect_to, ':') != NULL){
1613
2107
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
1614
2114
} else {
1615
2115
af = AF_INET;
1616
2116
}
2117
address = connect_to;
1617
2118
1618
2119
if(quit_now){
1619
2120
goto end;
1620
2121
}
1621
2122
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
if (not quit_now){
1644
2136
exitcode = EXIT_SUCCESS;
1645
2137
}
2138
1646
2139
goto end;
1647
2140
}
1648
2141
1670
2163
1671
2164
/* Check if creating the Avahi server object succeeded */
1672
2165
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
1675
2168
exitcode = EX_UNAVAILABLE;
1676
2169
goto end;
1677
2170
}
1685
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
2179
NULL, 0, browse_callback, NULL);
1687
2180
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
1690
2183
exitcode = EX_UNAVAILABLE;
1691
2184
goto end;
1692
2185
}
1698
2191
/* Run the main loop */
1699
2192
1700
2193
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
1705
2203
1706
2204
end:
1707
2205
1708
2206
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1710
2208
}
1711
2209
1712
2210
/* Cleanup things */
1729
2227
gpgme_release(mc.ctx);
1730
2228
}
1731
2229
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1735
2246
errno = 0;
1736
2247
ret = seteuid(0);
1737
2248
if(ret == -1){
1738
perror("seteuid");
2249
perror_plus("seteuid");
1739
2250
}
1740
if(geteuid() == 0){
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1741
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
2255
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
1745
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
2260
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1749
2262
}
1750
2263
}
1751
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
2265
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
2266
perror_plus("close");
1760
2267
}
1761
2268
}
1762
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
1763
2276
1764
/* Removes the temp directory used by GPGME */
2277
/* Removes the GPGME temp directory and all files inside */
1765
2278
if(tempdir_created){
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
}
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
1786
2286
char *fullname = NULL;
1787
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
2288
direntry->d_name);
1789
2289
if(ret < 0){
1790
perror("asprintf");
2290
perror_plus("asprintf");
1791
2291
continue;
1792
2292
}
1793
2293
ret = remove(fullname);
1794
2294
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
1797
2297
}
1798
2298
free(fullname);
1799
2299
}
1800
closedir(d);
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
1801
2306
}
1802
2307
ret = rmdir(tempdir);
1803
2308
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2309
perror_plus("rmdir");
1805
2310
}
1806
2311
}
1807
2312
1812
2317
&old_sigterm_action,
1813
2318
NULL));
1814
2319
if(ret == -1){
1815
perror("sigaction");
2320
perror_plus("sigaction");
1816
2321
}
1817
2322
do {
1818
2323
ret = raise(signal_received);
1819
2324
} while(ret != 0 and errno == EINTR);
1820
2325
if(ret != 0){
1821
perror("raise");
2326
perror_plus("raise");
1822
2327
abort();
1823
2328
}
1824
2329
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0