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- Committer: Teddy Hogeborn
- Date: 2011-11-29 18:19:31 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111129181931-vctlij1omtu1qbnx
* initramfs-tools-hook: Set DEVICE for network hooks.
- files added:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
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
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
152
187
/*
153
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
189
* bytes. "buffer_capacity" is how much is currently allocated,
155
190
* "buffer_length" is how much is already used.
156
191
*/
157
192
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
193
size_t buffer_capacity){
159
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
196
if(buffer == NULL){
166
201
return buffer_capacity;
167
202
}
168
203
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
169
241
/*
170
242
* Initialize GPGME.
171
243
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
174
246
gpgme_error_t rc;
175
247
gpgme_engine_info_t engine_info;
176
248
185
257
186
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
259
if(fd == -1){
188
perror("open");
260
perror_plus("open");
189
261
return false;
190
262
}
191
263
192
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
265
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));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
196
268
return false;
197
269
}
198
270
199
271
rc = gpgme_op_import(mc.ctx, pgp_data);
200
272
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
203
275
return false;
204
276
}
205
277
206
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
279
if(ret == -1){
208
perror("close");
280
perror_plus("close");
209
281
}
210
282
gpgme_data_release(pgp_data);
211
283
return true;
212
284
}
213
285
214
286
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
216
288
}
217
289
218
290
/* Init GPGME */
219
291
gpgme_check_version(NULL);
220
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
293
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
224
296
return false;
225
297
}
226
298
227
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
228
300
rc = gpgme_get_engine_info(&engine_info);
229
301
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
232
304
return false;
233
305
}
234
306
while(engine_info != NULL){
240
312
engine_info = engine_info->next;
241
313
}
242
314
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
244
317
return false;
245
318
}
246
319
247
320
/* Create new GPGME "context" */
248
321
rc = gpgme_new(&(mc.ctx));
249
322
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
252
326
return false;
253
327
}
254
328
273
347
ssize_t plaintext_length = 0;
274
348
275
349
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
351
}
278
352
279
353
/* Create new GPGME data buffer from memory cryptotext */
280
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
355
0);
282
356
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));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
285
359
return -1;
286
360
}
287
361
288
362
/* Create new empty GPGME data buffer for the plaintext */
289
363
rc = gpgme_data_new(&dh_plain);
290
364
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
293
368
gpgme_data_release(dh_crypto);
294
369
return -1;
295
370
}
298
373
data buffer */
299
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
375
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
303
378
plaintext_length = -1;
304
379
if(debug){
305
380
gpgme_decrypt_result_t result;
306
381
result = gpgme_op_decrypt_result(mc.ctx);
307
382
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
384
} 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);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
314
389
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
391
}
317
392
gpgme_recipient_t recipient;
318
393
recipient = result->recipients;
319
394
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");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
326
402
recipient = recipient->next;
327
403
}
328
404
}
331
407
}
332
408
333
409
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
411
}
336
412
337
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
415
perror_plus("gpgme_data_seek");
340
416
plaintext_length = -1;
341
417
goto decrypt_end;
342
418
}
344
420
*plaintext = NULL;
345
421
while(true){
346
422
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
349
425
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
353
429
}
354
430
355
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
436
break;
361
437
}
362
438
if(ret < 0){
363
perror("gpgme_data_read");
439
perror_plus("gpgme_data_read");
364
440
plaintext_length = -1;
365
441
goto decrypt_end;
366
442
}
368
444
}
369
445
370
446
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
372
448
for(ssize_t i = 0; i < plaintext_length; i++){
373
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
450
}
396
472
/* GnuTLS log function callback */
397
473
static void debuggnutls(__attribute__((unused)) int level,
398
474
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
400
476
}
401
477
402
478
static int init_gnutls_global(const char *pubkeyfilename,
404
480
int ret;
405
481
406
482
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
484
}
409
485
410
486
ret = gnutls_global_init();
411
487
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
414
490
return -1;
415
491
}
416
492
423
499
}
424
500
425
501
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
503
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));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
433
506
gnutls_global_deinit();
434
507
return -1;
435
508
}
436
509
437
510
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
441
515
}
442
516
443
517
ret = gnutls_certificate_set_openpgp_key_file
444
518
(mc.cred, pubkeyfilename, seckeyfilename,
445
519
GNUTLS_OPENPGP_FMT_BASE64);
446
520
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));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
452
526
goto globalfail;
453
527
}
454
528
455
529
/* GnuTLS server initialization */
456
530
ret = gnutls_dh_params_init(&mc.dh_params);
457
531
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
460
535
goto globalfail;
461
536
}
462
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
538
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
466
541
goto globalfail;
467
542
}
468
543
488
563
}
489
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
565
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
493
569
}
494
570
495
571
{
502
578
}
503
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
580
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));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
508
584
gnutls_deinit(*session);
509
585
return -1;
510
586
}
519
595
}
520
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
597
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
524
600
gnutls_deinit(*session);
525
601
return -1;
526
602
}
571
647
pf = PF_INET;
572
648
break;
573
649
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
651
errno = EINVAL;
576
652
return -1;
577
653
}
582
658
}
583
659
584
660
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
587
663
}
588
664
589
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
666
if(tcp_sd < 0){
591
667
int e = errno;
592
perror("socket");
668
perror_plus("socket");
593
669
errno = e;
594
670
goto mandos_end;
595
671
}
609
685
}
610
686
if(ret < 0 ){
611
687
int e = errno;
612
perror("inet_pton");
688
perror_plus("inet_pton");
613
689
errno = e;
614
690
goto mandos_end;
615
691
}
616
692
if(ret == 0){
617
693
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
695
errno = e;
620
696
goto mandos_end;
621
697
}
626
702
627
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
705
-Wunreachable-code*/
630
706
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
633
709
errno = EINVAL;
634
710
goto mandos_end;
635
711
}
651
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
728
char interface[IF_NAMESIZE];
653
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
730
perror_plus("if_indextoname");
655
731
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
658
734
}
659
735
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
662
738
}
663
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
747
sizeof(addrstr));
672
748
}
673
749
if(pcret == NULL){
674
perror("inet_ntop");
750
perror_plus("inet_ntop");
675
751
} else {
676
752
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
754
}
679
755
}
680
756
}
692
768
if(ret < 0){
693
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
770
int e = errno;
695
perror("connect");
771
perror_plus("connect");
696
772
errno = e;
697
773
}
698
774
goto mandos_end;
708
784
while(true){
709
785
size_t out_size = strlen(out);
710
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
787
out_size - written));
712
788
if(ret == -1){
713
789
int e = errno;
714
perror("write");
790
perror_plus("write");
715
791
errno = e;
716
792
goto mandos_end;
717
793
}
734
810
}
735
811
736
812
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
814
}
739
815
740
816
if(quit_now){
742
818
goto mandos_end;
743
819
}
744
820
821
/* Spurious warning from -Wint-to-pointer-cast */
745
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
823
747
824
if(quit_now){
759
836
760
837
if(ret != GNUTLS_E_SUCCESS){
761
838
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
840
gnutls_perror(ret);
764
841
}
765
842
errno = EPROTO;
769
846
/* Read OpenPGP packet that contains the wanted password */
770
847
771
848
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
774
851
}
775
852
776
853
while(true){
781
858
}
782
859
783
860
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
861
buffer_capacity);
785
862
if(buffer_capacity == 0){
786
863
int e = errno;
787
perror("incbuffer");
864
perror_plus("incbuffer");
788
865
errno = e;
789
866
goto mandos_end;
790
867
}
814
891
}
815
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
893
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
818
896
gnutls_perror(ret);
819
897
errno = EPROTO;
820
898
goto mandos_end;
821
899
}
822
900
break;
823
901
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
826
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
905
errno = EIO;
828
906
goto mandos_end;
833
911
}
834
912
835
913
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
837
915
}
838
916
839
917
if(quit_now){
851
929
852
930
if(buffer_length > 0){
853
931
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
856
933
&decrypted_buffer);
857
934
if(decrypted_buffer_size >= 0){
858
935
869
946
if(ret == 0 and ferror(stdout)){
870
947
int e = errno;
871
948
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
874
951
}
875
952
errno = e;
876
953
goto mandos_end;
895
972
if(e == 0){
896
973
e = errno;
897
974
}
898
perror("close");
975
perror_plus("close");
899
976
}
900
977
gnutls_deinit(session);
978
errno = e;
901
979
if(quit_now){
902
e = EINTR;
980
errno = EINTR;
903
981
retval = -1;
904
982
}
905
errno = e;
906
983
}
907
984
return retval;
908
985
}
933
1010
switch(event){
934
1011
default:
935
1012
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)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
939
1017
break;
940
1018
941
1019
case AVAHI_RESOLVER_FOUND:
943
1021
char ip[AVAHI_ADDRESS_STR_MAX];
944
1022
avahi_address_snprint(ip, sizeof(ip), address);
945
1023
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);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
949
1027
}
950
1028
int ret = start_mandos_communication(ip, port, interface,
951
1029
avahi_proto_to_af(proto));
952
1030
if(ret == 0){
953
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
954
1035
}
955
1036
}
956
1037
}
980
1061
default:
981
1062
case AVAHI_BROWSER_FAILURE:
982
1063
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
985
1066
avahi_simple_poll_quit(mc.simple_poll);
986
1067
return;
987
1068
994
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
1076
name, type, domain, protocol, 0,
996
1077
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
999
1081
break;
1000
1082
1001
1083
case AVAHI_BROWSER_REMOVE:
1004
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1088
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1008
1091
}
1009
1092
break;
1010
1093
}
1011
1094
}
1012
1095
1013
/* stop main loop after sigterm has been called */
1096
/* Signal handler that stops main loop after SIGTERM */
1014
1097
static void handle_sigterm(int sig){
1015
1098
if(quit_now){
1016
1099
return;
1018
1101
quit_now = 1;
1019
1102
signal_received = sig;
1020
1103
int old_errno = errno;
1104
/* set main loop to exit */
1021
1105
if(mc.simple_poll != NULL){
1022
1106
avahi_simple_poll_quit(mc.simple_poll);
1023
1107
}
1024
1108
errno = old_errno;
1025
1109
}
1026
1110
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){
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1081
1122
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1084
1124
}
1085
free(flagstring);
1086
return 0;
1125
return false;
1087
1126
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1090
1132
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1092
1134
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1095
1137
}
1096
return 0;
1138
return false;
1097
1139
}
1098
1140
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1100
1142
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1103
1145
}
1104
return 1;
1146
return true;
1105
1147
}
1106
1148
/* 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
}
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1114
1165
/* Accept this device */
1115
1166
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1120
1509
}
1121
1510
1122
1511
int main(int argc, char *argv[]){
1141
1530
bool gnutls_initialized = false;
1142
1531
bool gpgme_initialized = false;
1143
1532
float delay = 2.5f;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1144
1535
1145
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1537
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1543
errno = 0;
1153
1544
ret = setgid(gid);
1154
1545
if(ret == -1){
1155
perror("setgid");
1546
perror_plus("setgid");
1156
1547
}
1157
1548
1158
1549
/* Lower user privileges (temporarily) */
1159
1550
errno = 0;
1160
1551
ret = seteuid(uid);
1161
1552
if(ret == -1){
1162
perror("seteuid");
1553
perror_plus("seteuid");
1163
1554
}
1164
1555
1165
1556
if(quit_now){
1200
1591
.arg = "SECONDS",
1201
1592
.doc = "Maximum delay to wait for interface startup",
1202
1593
.group = 2 },
1594
{ .name = "retry", .key = 132,
1595
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1203
1602
/*
1204
1603
* These reproduce what we would get without ARGP_NO_HELP
1205
1604
*/
1249
1648
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1649
argp_error(state, "Bad delay");
1251
1650
}
1651
case 132: /* --retry */
1652
errno = 0;
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1658
}
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1252
1662
break;
1253
1663
/*
1254
1664
* These reproduce what we would get without ARGP_NO_HELP
1261
1671
argp_state_help(state, state->out_stream,
1262
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1673
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1677
exit(argp_err_exit_status);
1266
1678
break;
1267
1679
default:
1282
1694
case ENOMEM:
1283
1695
default:
1284
1696
errno = ret;
1285
perror("argp_parse");
1697
perror_plus("argp_parse");
1286
1698
exitcode = EX_OSERR;
1287
1699
goto end;
1288
1700
case EINVAL:
1290
1702
goto end;
1291
1703
}
1292
1704
}
1705
1706
{
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1709
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1772
}
1293
1773
1294
1774
if(not debug){
1295
1775
avahi_set_log_function(empty_log);
1296
1776
}
1297
1777
1298
1778
if(interface[0] == '\0'){
1299
1779
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1301
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1302
1789
if(ret >= 1){
1303
/* Pick the first good interface */
1790
/* Pick the first interface returned */
1304
1791
interface = strdup(direntries[0]->d_name);
1305
1792
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1307
1794
}
1308
1795
if(interface == NULL){
1309
perror("malloc");
1796
perror_plus("malloc");
1310
1797
free(direntries);
1311
1798
exitcode = EXIT_FAILURE;
1312
1799
goto end;
1314
1801
free(direntries);
1315
1802
} else {
1316
1803
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1318
1805
exitcode = EXIT_FAILURE;
1319
1806
goto end;
1320
1807
}
1326
1813
srand((unsigned int) time(NULL));
1327
1814
mc.simple_poll = avahi_simple_poll_new();
1328
1815
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1330
1818
exitcode = EX_UNAVAILABLE;
1331
1819
goto end;
1332
1820
}
1334
1822
sigemptyset(&sigterm_action.sa_mask);
1335
1823
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
1824
if(ret == -1){
1337
perror("sigaddset");
1825
perror_plus("sigaddset");
1338
1826
exitcode = EX_OSERR;
1339
1827
goto end;
1340
1828
}
1341
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
1830
if(ret == -1){
1343
perror("sigaddset");
1831
perror_plus("sigaddset");
1344
1832
exitcode = EX_OSERR;
1345
1833
goto end;
1346
1834
}
1347
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
1836
if(ret == -1){
1349
perror("sigaddset");
1837
perror_plus("sigaddset");
1350
1838
exitcode = EX_OSERR;
1351
1839
goto end;
1352
1840
}
1356
1844
*/
1357
1845
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
1846
if(ret == -1){
1359
perror("sigaction");
1847
perror_plus("sigaction");
1360
1848
return EX_OSERR;
1361
1849
}
1362
1850
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
1851
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
1852
if(ret == -1){
1365
perror("sigaction");
1853
perror_plus("sigaction");
1366
1854
exitcode = EX_OSERR;
1367
1855
goto end;
1368
1856
}
1369
1857
}
1370
1858
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
1859
if(ret == -1){
1372
perror("sigaction");
1860
perror_plus("sigaction");
1373
1861
return EX_OSERR;
1374
1862
}
1375
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
1864
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
1865
if(ret == -1){
1378
perror("sigaction");
1866
perror_plus("sigaction");
1379
1867
exitcode = EX_OSERR;
1380
1868
goto end;
1381
1869
}
1382
1870
}
1383
1871
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
1872
if(ret == -1){
1385
perror("sigaction");
1873
perror_plus("sigaction");
1386
1874
return EX_OSERR;
1387
1875
}
1388
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
1877
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
1878
if(ret == -1){
1391
perror("sigaction");
1879
perror_plus("sigaction");
1392
1880
exitcode = EX_OSERR;
1393
1881
goto end;
1394
1882
}
1398
1886
if(strcmp(interface, "none") != 0){
1399
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
1888
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1402
1890
exitcode = EX_UNAVAILABLE;
1403
1891
goto end;
1404
1892
}
1411
1899
errno = 0;
1412
1900
ret = seteuid(0);
1413
1901
if(ret == -1){
1414
perror("seteuid");
1902
perror_plus("seteuid");
1415
1903
}
1416
1904
1417
1905
#ifdef __linux__
1421
1909
bool restore_loglevel = true;
1422
1910
if(ret == -1){
1423
1911
restore_loglevel = false;
1424
perror("klogctl");
1912
perror_plus("klogctl");
1425
1913
}
1426
1914
#endif /* __linux__ */
1427
1915
1428
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1917
if(sd < 0){
1430
perror("socket");
1918
perror_plus("socket");
1431
1919
exitcode = EX_OSERR;
1432
1920
#ifdef __linux__
1433
1921
if(restore_loglevel){
1434
1922
ret = klogctl(7, NULL, 0);
1435
1923
if(ret == -1){
1436
perror("klogctl");
1924
perror_plus("klogctl");
1437
1925
}
1438
1926
}
1439
1927
#endif /* __linux__ */
1441
1929
errno = 0;
1442
1930
ret = seteuid(uid);
1443
1931
if(ret == -1){
1444
perror("seteuid");
1932
perror_plus("seteuid");
1445
1933
}
1446
1934
goto end;
1447
1935
}
1448
1936
strcpy(network.ifr_name, interface);
1449
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
1938
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1939
perror_plus("ioctl SIOCGIFFLAGS");
1452
1940
#ifdef __linux__
1453
1941
if(restore_loglevel){
1454
1942
ret = klogctl(7, NULL, 0);
1455
1943
if(ret == -1){
1456
perror("klogctl");
1944
perror_plus("klogctl");
1457
1945
}
1458
1946
}
1459
1947
#endif /* __linux__ */
1462
1950
errno = 0;
1463
1951
ret = seteuid(uid);
1464
1952
if(ret == -1){
1465
perror("seteuid");
1953
perror_plus("seteuid");
1466
1954
}
1467
1955
goto end;
1468
1956
}
1472
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1961
if(ret == -1){
1474
1962
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1476
1964
exitcode = EX_OSERR;
1477
1965
#ifdef __linux__
1478
1966
if(restore_loglevel){
1479
1967
ret = klogctl(7, NULL, 0);
1480
1968
if(ret == -1){
1481
perror("klogctl");
1969
perror_plus("klogctl");
1482
1970
}
1483
1971
}
1484
1972
#endif /* __linux__ */
1486
1974
errno = 0;
1487
1975
ret = seteuid(uid);
1488
1976
if(ret == -1){
1489
perror("seteuid");
1977
perror_plus("seteuid");
1490
1978
}
1491
1979
goto end;
1492
1980
}
1493
1981
}
1494
/* sleep checking until interface is running */
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1495
1984
for(int i=0; i < delay * 4; i++){
1496
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
1986
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1987
perror_plus("ioctl SIOCGIFFLAGS");
1499
1988
} else if(network.ifr_flags & IFF_RUNNING){
1500
1989
break;
1501
1990
}
1502
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
1992
ret = nanosleep(&sleeptime, NULL);
1504
1993
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1994
perror_plus("nanosleep");
1506
1995
}
1507
1996
}
1508
1997
if(not take_down_interface){
1509
1998
/* We won't need the socket anymore */
1510
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
2000
if(ret == -1){
1512
perror("close");
2001
perror_plus("close");
1513
2002
}
1514
2003
}
1515
2004
#ifdef __linux__
1517
2006
/* Restores kernel loglevel to default */
1518
2007
ret = klogctl(7, NULL, 0);
1519
2008
if(ret == -1){
1520
perror("klogctl");
2009
perror_plus("klogctl");
1521
2010
}
1522
2011
}
1523
2012
#endif /* __linux__ */
1524
2013
/* Lower privileges */
1525
2014
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
}
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
1538
2019
}
1539
2020
}
1540
2021
1544
2025
1545
2026
ret = init_gnutls_global(pubkey, seckey);
1546
2027
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2029
exitcode = EX_UNAVAILABLE;
1549
2030
goto end;
1550
2031
} else {
1555
2036
goto end;
1556
2037
}
1557
2038
2039
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
2041
goto end;
2042
}
1558
2043
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2044
1565
2045
if(quit_now){
1566
2046
goto end;
1567
2047
}
1568
2048
1569
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2050
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2051
exitcode = EX_UNAVAILABLE;
1572
2052
goto end;
1573
2053
} else {
1583
2063
/* (Mainly meant for debugging) */
1584
2064
char *address = strrchr(connect_to, ':');
1585
2065
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2066
fprintf_plus(stderr, "No colon in address\n");
1587
2067
exitcode = EX_USAGE;
1588
2068
goto end;
1589
2069
}
1597
2077
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
2079
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2080
fprintf_plus(stderr, "Bad port number\n");
1601
2081
exitcode = EX_USAGE;
1602
2082
goto end;
1603
2083
}
1608
2088
1609
2089
port = (uint16_t)tmpmax;
1610
2090
*address = '\0';
1611
address = connect_to;
1612
2091
/* Colon in address indicates IPv6 */
1613
2092
int af;
1614
if(strchr(address, ':') != NULL){
2093
if(strchr(connect_to, ':') != NULL){
1615
2094
af = AF_INET6;
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2097
{
2098
connect_to++;
2099
address[-1] = '\0';
2100
}
1616
2101
} else {
1617
2102
af = AF_INET;
1618
2103
}
2104
address = connect_to;
1619
2105
1620
2106
if(quit_now){
1621
2107
goto end;
1622
2108
}
1623
2109
1624
2110
while(not quit_now){
1625
2111
ret = start_mandos_communication(address, port, if_index, af);
1626
2112
if(quit_now or ret == 0){
1627
2113
break;
1628
2114
}
1629
sleep(15);
1630
};
1631
2115
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2118
}
2119
sleep((int)retry_interval);
2120
}
2121
1632
2122
if (not quit_now){
1633
2123
exitcode = EXIT_SUCCESS;
1634
2124
}
1635
2125
1636
2126
goto end;
1637
2127
}
1638
2128
1660
2150
1661
2151
/* Check if creating the Avahi server object succeeded */
1662
2152
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
1665
2155
exitcode = EX_UNAVAILABLE;
1666
2156
goto end;
1667
2157
}
1675
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
2166
NULL, 0, browse_callback, NULL);
1677
2167
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
1680
2170
exitcode = EX_UNAVAILABLE;
1681
2171
goto end;
1682
2172
}
1688
2178
/* Run the main loop */
1689
2179
1690
2180
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2186
if(debug){
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1695
2190
1696
2191
end:
1697
2192
1698
2193
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2195
}
1701
2196
1702
2197
/* Cleanup things */
1719
2214
gpgme_release(mc.ctx);
1720
2215
}
1721
2216
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
2217
/* Cleans up the circular linked list of Mandos servers the client
2218
has seen */
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2225
}
2226
}
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
1725
2233
errno = 0;
1726
2234
ret = seteuid(0);
1727
2235
if(ret == -1){
1728
perror("seteuid");
2236
perror_plus("seteuid");
1729
2237
}
1730
if(geteuid() == 0){
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
1731
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
2242
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
1735
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
2247
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1739
2249
}
1740
2250
}
1741
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
2252
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");
2253
perror_plus("close");
1750
2254
}
1751
2255
}
1752
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
1753
2263
1754
/* Removes the temp directory used by GPGME */
2264
/* Removes the GPGME temp directory and all files inside */
1755
2265
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
}
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
1776
2273
char *fullname = NULL;
1777
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2275
direntry->d_name);
1779
2276
if(ret < 0){
1780
perror("asprintf");
2277
perror_plus("asprintf");
1781
2278
continue;
1782
2279
}
1783
2280
ret = remove(fullname);
1784
2281
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
1787
2284
}
1788
2285
free(fullname);
1789
2286
}
1790
closedir(d);
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
1791
2293
}
1792
2294
ret = rmdir(tempdir);
1793
2295
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2296
perror_plus("rmdir");
1795
2297
}
1796
2298
}
1797
2299
1802
2304
&old_sigterm_action,
1803
2305
NULL));
1804
2306
if(ret == -1){
1805
perror("sigaction");
2307
perror_plus("sigaction");
1806
2308
}
1807
2309
do {
1808
2310
ret = raise(signal_received);
1809
2311
} while(ret != 0 and errno == EINTR);
1810
2312
if(ret != 0){
1811
perror("raise");
2313
perror_plus("raise");
1812
2314
abort();
1813
2315
}
1814
2316
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0