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- Committer: teddy at recompile
- Date: 2020-04-05 21:30:59 UTC
- Revision ID: teddy@recompile.se-20200405213059-fb2a61ckqynrmatk
Fix file descriptor leak in mandos-client
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
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#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
113
123
gnutls_*
114
124
init_gnutls_session(),
115
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
116
127
#include <gnutls/openpgp.h>
117
128
/* gnutls_certificate_set_openpgp_key_file(),
118
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
119
135
120
136
/* GPGME */
121
137
#include <gpgme.h> /* All GPGME types, constants and
129
145
#define PATHDIR "/conf/conf.d/mandos"
130
146
#define SECKEY "seckey.txt"
131
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
132
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
151
134
152
bool debug = false;
138
156
static const char sys_class_net[] = "/sys/class/net";
139
157
char *connect_to = NULL;
140
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
141
160
uid_t uid = 65534;
142
161
gid_t gid = 65534;
143
162
180
199
perror(print_text);
181
200
}
182
201
183
__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
184
203
int fprintf_plus(FILE *stream, const char *format, ...){
185
204
va_list ap;
186
205
va_start (ap, format);
187
206
188
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
208
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
210
}
192
211
193
212
/*
195
214
* bytes. "buffer_capacity" is how much is currently allocated,
196
215
* "buffer_length" is how much is already used.
197
216
*/
217
__attribute__((nonnull, warn_unused_result))
198
218
size_t incbuffer(char **buffer, size_t buffer_length,
199
219
size_t buffer_capacity){
200
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
203
227
return 0;
204
228
}
229
*buffer = new_buf;
205
230
buffer_capacity += BUFFER_SIZE;
206
231
}
207
232
return buffer_capacity;
208
233
}
209
234
210
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
211
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
238
int af, server **current_server){
213
239
int ret;
222
248
.af = af };
223
249
if(new_server->ip == NULL){
224
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
225
266
return false;
226
267
}
227
268
/* Special case of first server */
229
270
new_server->next = new_server;
230
271
new_server->prev = new_server;
231
272
*current_server = new_server;
232
/* Place the new server last in the list */
233
273
} else {
274
/* Place the new server last in the list */
234
275
new_server->next = *current_server;
235
276
new_server->prev = (*current_server)->prev;
236
277
new_server->prev->next = new_server;
237
278
(*current_server)->prev = new_server;
238
279
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
280
return true;
245
281
}
246
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
247
335
/*
248
336
* Initialize GPGME.
249
337
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
252
343
gpgme_error_t rc;
253
344
gpgme_engine_info_t engine_info;
254
345
255
346
/*
256
347
* Helper function to insert pub and seckey to the engine keyring.
257
348
*/
258
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
259
350
int ret;
260
351
int fd;
261
352
gpgme_data_t pgp_data;
266
357
return false;
267
358
}
268
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
269
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
411
if(rc != GPG_ERR_NO_ERROR){
271
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
279
420
gpgme_strsource(rc), gpgme_strerror(rc));
280
421
return false;
281
422
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
282
498
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
284
500
if(ret == -1){
285
501
perror_plus("close");
286
502
}
325
541
/* Create new GPGME "context" */
326
542
rc = gpgme_new(&(mc->ctx));
327
543
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
331
546
return false;
332
547
}
333
548
342
557
* Decrypt OpenPGP data.
343
558
* Returns -1 on error
344
559
*/
560
__attribute__((nonnull, warn_unused_result))
345
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
562
size_t crypto_size,
347
563
char **plaintext,
368
584
/* Create new empty GPGME data buffer for the plaintext */
369
585
rc = gpgme_data_new(&dh_plain);
370
586
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
373
588
gpgme_strsource(rc), gpgme_strerror(rc));
374
589
gpgme_data_release(dh_crypto);
375
590
return -1;
388
603
if(result == NULL){
389
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
605
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
395
612
if(result->file_name != NULL){
396
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
614
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
401
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
405
621
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
409
623
}
410
624
}
411
625
}
467
681
return plaintext_length;
468
682
}
469
683
470
static const char * safer_gnutls_strerror(int value){
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
__attribute__((warn_unused_result))
692
static const char *safer_gnutls_strerror(int value){
471
693
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
694
return safe_string(ret);
475
695
}
476
696
477
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
478
699
static void debuggnutls(__attribute__((unused)) int level,
479
700
const char* string){
480
701
fprintf_plus(stderr, "GnuTLS: %s", string);
481
702
}
482
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
705
static int init_gnutls_global(const char *pubkeyfilename,
484
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
485
708
mandos_context *mc){
486
709
int ret;
487
710
489
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
713
}
491
714
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
499
715
if(debug){
500
716
/* "Use a log level over 10 to enable all debugging options."
501
717
* - GnuTLS manual
509
725
if(ret != GNUTLS_E_SUCCESS){
510
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
727
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
513
728
return -1;
514
729
}
515
730
516
731
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
519
734
pubkeyfilename,
520
735
seckeyfilename);
521
736
}
522
737
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
523
751
ret = gnutls_certificate_set_openpgp_key_file
524
752
(mc->cred, pubkeyfilename, seckeyfilename,
525
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
526
757
if(ret != GNUTLS_E_SUCCESS){
527
758
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
529
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
762
safer_gnutls_strerror(ret));
540
771
safer_gnutls_strerror(ret));
541
772
goto globalfail;
542
773
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
551
956
552
957
return 0;
553
958
554
959
globalfail:
555
960
556
961
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
558
962
gnutls_dh_params_deinit(mc->dh_params);
559
963
return -1;
560
964
}
561
965
966
__attribute__((nonnull, warn_unused_result))
562
967
static int init_gnutls_session(gnutls_session_t *session,
563
968
mandos_context *mc){
564
969
int ret;
565
970
/* GnuTLS session creation */
566
971
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
568
980
if(quit_now){
569
981
return -1;
570
982
}
611
1023
/* ignore client certificate if any. */
612
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
1025
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
616
1026
return 0;
617
1027
}
618
1028
620
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
1031
__attribute__((unused)) const char *txt){}
622
1032
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
close(devnull);
1078
_exit(EX_NOPERM);
1079
}
1080
/* Reset supplementary groups */
1081
errno = 0;
1082
ret = setgroups(0, NULL);
1083
if(ret == -1){
1084
perror_plus("setgroups");
1085
close(devnull);
1086
_exit(EX_NOPERM);
1087
}
1088
}
1089
ret = dup2(devnull, STDIN_FILENO);
1090
if(ret == -1){
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
close(devnull);
1093
_exit(EX_OSERR);
1094
}
1095
ret = close(devnull);
1096
if(ret == -1){
1097
perror_plus("close");
1098
}
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
if(ret == -1){
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
_exit(EX_OSERR);
1103
}
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1105
O_RDONLY
1106
| O_DIRECTORY
1107
| O_PATH
1108
| O_CLOEXEC));
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1112
}
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
helper, O_RDONLY));
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1119
}
1120
close(helperdir_fd);
1121
#ifdef __GNUC__
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
#endif
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1128
environ) == -1){
1129
#ifdef __GNUC__
1130
#pragma GCC diagnostic pop
1131
#endif
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1134
}
1135
}
1136
if(pid == -1){
1137
perror_plus("fork");
1138
close(devnull);
1139
return false;
1140
}
1141
ret = close(devnull);
1142
if(ret == -1){
1143
perror_plus("close");
1144
}
1145
int status;
1146
pid_t pret = -1;
1147
errno = 0;
1148
do {
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1156
}
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1159
}
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1162
" helper program");
1163
}
1164
return false;
1165
}
1166
} while(pret == -1 and errno == EINTR);
1167
if(pret == -1){
1168
perror_plus("waitpid");
1169
return false;
1170
}
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1175
return false;
1176
}
1177
return true;
1178
}
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1182
return false;
1183
}
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1185
return false;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1191
if(debug){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
}
1194
return add_delete_local_route(true, address, if_index);
1195
}
1196
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1200
if(debug){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
}
1203
return add_delete_local_route(false, address, if_index);
1204
}
1205
623
1206
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
624
1208
static int start_mandos_communication(const char *ip, in_port_t port,
625
1209
AvahiIfIndex if_index,
626
1210
int af, mandos_context *mc){
627
1211
int ret, tcp_sd = -1;
628
1212
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1213
struct sockaddr_storage to;
633
1214
char *buffer = NULL;
634
1215
char *decrypted_buffer = NULL;
635
1216
size_t buffer_length = 0;
638
1219
int retval = -1;
639
1220
gnutls_session_t session;
640
1221
int pf; /* Protocol family */
1222
bool route_added = false;
641
1223
642
1224
errno = 0;
643
1225
659
1241
return -1;
660
1242
}
661
1243
1244
/* If the interface is specified and we have a list of interfaces */
662
1245
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
1246
/* Check if the interface is one of the interfaces we are using */
664
1247
bool match = false;
665
1248
{
666
1249
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
669
1253
if(if_nametoindex(interface) == (unsigned int)if_index){
670
1254
match = true;
671
1255
break;
673
1257
}
674
1258
}
675
1259
if(not match){
1260
/* This interface does not match any in the list, so we don't
1261
connect to the server */
676
1262
if(debug){
677
1263
char interface[IF_NAMESIZE];
678
1264
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
1284
PRIuMAX "\n", ip, (uintmax_t)port);
699
1285
}
700
1286
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
702
1288
if(tcp_sd < 0){
703
1289
int e = errno;
704
1290
perror_plus("socket");
711
1297
goto mandos_end;
712
1298
}
713
1299
714
memset(&to, 0, sizeof(to));
715
1300
if(af == AF_INET6){
716
to.in6.sin6_family = (sa_family_t)af;
717
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
718
1304
} else { /* IPv4 */
719
to.in.sin_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in.sin_addr);
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
721
1308
}
722
1309
if(ret < 0 ){
723
1310
int e = errno;
732
1319
goto mandos_end;
733
1320
}
734
1321
if(af == AF_INET6){
735
to.in6.sin6_port = htons(port);
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
-Wunreachable-code*/
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
739
1325
if(if_index == AVAHI_IF_UNSPEC){
740
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
741
1327
" incomplete without a network interface\n");
743
1329
goto mandos_end;
744
1330
}
745
1331
/* Set the network interface number as scope */
746
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
747
1333
}
748
1334
} else {
749
to.in.sin_port = htons(port); /* Spurious warnings from
750
-Wconversion and
751
-Wunreachable-code */
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
1336
}
753
1337
754
1338
if(quit_now){
771
1355
}
772
1356
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
773
1357
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
774
const char *pcret;
775
if(af == AF_INET6){
776
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
777
sizeof(addrstr));
778
} else {
779
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
780
sizeof(addrstr));
781
}
782
if(pcret == NULL){
783
perror_plus("inet_ntop");
784
} else {
785
if(strcmp(addrstr, ip) != 0){
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
787
}
788
}
789
}
790
791
if(quit_now){
792
errno = EINTR;
793
goto mandos_end;
794
}
795
796
if(af == AF_INET6){
797
ret = connect(tcp_sd, &to.in6, sizeof(to));
798
} else {
799
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
800
}
801
if(ret < 0){
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
803
int e = errno;
804
perror_plus("connect");
805
errno = e;
806
}
807
goto mandos_end;
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
1358
if(af == AF_INET6){
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1362
NI_NUMERICHOST);
1363
} else {
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1367
NI_NUMERICHOST);
1368
}
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1375
}
1376
}
1377
1378
if(quit_now){
1379
errno = EINTR;
1380
goto mandos_end;
1381
}
1382
1383
while(true){
1384
if(af == AF_INET6){
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1387
} else {
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1390
}
1391
if(ret < 0){
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
&to)->sin6_addr)))
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1409
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1413
*/
1414
if(debug){
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1416
" direct route\n");
1417
}
1418
int e = errno;
1419
route_added = add_local_route(ip, if_index);
1420
if(route_added){
1421
continue;
1422
}
1423
errno = e;
1424
}
1425
if(errno != ECONNREFUSED or debug){
1426
int e = errno;
1427
perror_plus("connect");
1428
errno = e;
1429
}
1430
goto mandos_end;
1431
}
1432
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
break;
813
1438
}
814
1439
815
1440
const char *out = mandos_protocol_version;
969
1594
&decrypted_buffer, mc);
970
1595
if(decrypted_buffer_size >= 0){
971
1596
1597
clearerr(stdout);
972
1598
written = 0;
973
1599
while(written < (size_t) decrypted_buffer_size){
974
1600
if(quit_now){
990
1616
}
991
1617
written += (size_t)ret;
992
1618
}
1619
ret = fflush(stdout);
1620
if(ret != 0){
1621
int e = errno;
1622
if(debug){
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1624
strerror(errno));
1625
}
1626
errno = e;
1627
goto mandos_end;
1628
}
993
1629
retval = 0;
994
1630
}
995
1631
}
998
1634
999
1635
mandos_end:
1000
1636
{
1637
if(route_added){
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1641
}
1642
}
1001
1643
int e = errno;
1002
1644
free(decrypted_buffer);
1003
1645
free(buffer);
1004
1646
if(tcp_sd >= 0){
1005
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
ret = close(tcp_sd);
1006
1648
}
1007
1649
if(ret == -1){
1008
1650
if(e == 0){
1033
1675
AVAHI_GCC_UNUSED AvahiStringList *txt,
1034
1676
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1035
1677
flags,
1036
void* mc){
1678
void *mc){
1037
1679
if(r == NULL){
1038
1680
return;
1039
1681
}
1042
1684
timed out */
1043
1685
1044
1686
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1045
1688
return;
1046
1689
}
1047
1690
1092
1735
const char *domain,
1093
1736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1094
1737
flags,
1095
void* mc){
1738
void *mc){
1096
1739
if(b == NULL){
1097
1740
return;
1098
1741
}
1158
1801
errno = old_errno;
1159
1802
}
1160
1803
1804
__attribute__((nonnull, warn_unused_result))
1161
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1162
1806
int ret;
1163
error_t ret_errno;
1807
int old_errno;
1164
1808
1165
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1166
1810
if(s < 0){
1167
ret_errno = errno;
1811
old_errno = errno;
1168
1812
perror_plus("socket");
1169
errno = ret_errno;
1813
errno = old_errno;
1170
1814
return false;
1171
1815
}
1172
strcpy(ifr->ifr_name, ifname);
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1173
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1174
1819
if(ret == -1){
1175
1820
if(debug){
1176
ret_errno = errno;
1821
old_errno = errno;
1177
1822
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1823
errno = old_errno;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1179
1829
}
1180
1830
return false;
1181
1831
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1182
1837
return true;
1183
1838
}
1184
1839
1840
__attribute__((nonnull, warn_unused_result))
1185
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1186
1842
1187
1843
/* Reject the loopback device */
1229
1885
* corresponds to an acceptable network device.
1230
1886
* (This function is passed to scandir(3) as a filter function.)
1231
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1232
1889
int good_interface(const struct dirent *if_entry){
1233
1890
if(if_entry->d_name[0] == '.'){
1234
1891
return 0;
1252
1909
/*
1253
1910
* This function determines if a network interface is up.
1254
1911
*/
1912
__attribute__((nonnull, warn_unused_result))
1255
1913
bool interface_is_up(const char *interface){
1256
1914
struct ifreq ifr;
1257
1915
if(not get_flags(interface, &ifr)){
1268
1926
/*
1269
1927
* This function determines if a network interface is running
1270
1928
*/
1929
__attribute__((nonnull, warn_unused_result))
1271
1930
bool interface_is_running(const char *interface){
1272
1931
struct ifreq ifr;
1273
1932
if(not get_flags(interface, &ifr)){
1281
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1282
1941
}
1283
1942
1943
__attribute__((nonnull, pure, warn_unused_result))
1284
1944
int notdotentries(const struct dirent *direntry){
1285
1945
/* Skip "." and ".." */
1286
1946
if(direntry->d_name[0] == '.'
1293
1953
}
1294
1954
1295
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1296
1957
int runnable_hook(const struct dirent *direntry){
1297
1958
int ret;
1298
1959
size_t sret;
1306
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1307
1968
"abcdefghijklmnopqrstuvwxyz"
1308
1969
"0123456789"
1309
"_-");
1970
"_.-");
1310
1971
if((direntry->d_name)[sret] != '\0'){
1311
1972
/* Contains non-allowed characters */
1312
1973
if(debug){
1316
1977
return 0;
1317
1978
}
1318
1979
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1327
1981
if(ret == -1){
1328
1982
if(debug){
1329
1983
perror_plus("Could not stat hook");
1353
2007
return 1;
1354
2008
}
1355
2009
2010
__attribute__((nonnull, warn_unused_result))
1356
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
2012
mandos_context *mc){
1358
2013
int ret;
1362
2017
1363
2018
while(true){
1364
2019
if(mc->current_server == NULL){
1365
if (debug){
2020
if(debug){
1366
2021
fprintf_plus(stderr, "Wait until first server is found."
1367
2022
" No timeout!\n");
1368
2023
}
1369
2024
ret = avahi_simple_poll_iterate(s, -1);
1370
2025
} else {
1371
if (debug){
2026
if(debug){
1372
2027
fprintf_plus(stderr, "Check current_server if we should run"
1373
2028
" it, or wait\n");
1374
2029
}
1391
2046
- ((intmax_t)waited_time.tv_sec * 1000))
1392
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
1393
2048
1394
if (debug){
2049
if(debug){
1395
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1396
2051
block_time);
1397
2052
}
1419
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
1420
2075
}
1421
2076
if(ret != 0){
1422
if (ret > 0 or errno != EINTR){
2077
if(ret > 0 or errno != EINTR){
1423
2078
return (ret != 1) ? ret : 0;
1424
2079
}
1425
2080
}
1426
2081
}
1427
2082
}
1428
2083
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
1482
2086
const float delay){
1483
struct dirent **direntries;
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
| O_CLOEXEC);
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2093
if(debug){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2096
}
2097
} else {
2098
perror_plus("open");
2099
}
2100
return;
2101
}
2102
}
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
if(devnull == -1){
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2106
return;
2107
}
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
2110
if(numhooks == -1){
2111
perror_plus("scandir");
2112
close(devnull);
2113
return;
2114
}
1484
2115
struct dirent *direntry;
1485
2116
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1488
if(numhooks == -1){
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2119
if(debug){
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2121
direntry->d_name);
1496
2122
}
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
2123
pid_t hook_pid = fork();
2124
if(hook_pid == 0){
2125
/* Child */
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2128
if(errno != 0){
2129
perror_plus("Failed to raise privileges");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Set group */
2133
errno = 0;
2134
ret = setgid(0);
2135
if(ret == -1){
2136
perror_plus("setgid");
2137
_exit(EX_NOPERM);
2138
}
2139
/* Reset supplementary groups */
2140
errno = 0;
2141
ret = setgroups(0, NULL);
2142
if(ret == -1){
2143
perror_plus("setgroups");
2144
_exit(EX_NOPERM);
2145
}
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
if(ret == -1){
2148
perror_plus("setenv");
2149
_exit(EX_OSERR);
2150
}
2151
ret = setenv("DEVICE", interface, 1);
2152
if(ret == -1){
2153
perror_plus("setenv");
2154
_exit(EX_OSERR);
2155
}
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2157
if(ret == -1){
2158
perror_plus("setenv");
2159
_exit(EX_OSERR);
2160
}
2161
ret = setenv("MODE", mode, 1);
2162
if(ret == -1){
2163
perror_plus("setenv");
2164
_exit(EX_OSERR);
2165
}
2166
char *delaystring;
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2168
if(ret == -1){
1504
2169
perror_plus("asprintf");
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
1563
2174
free(delaystring);
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
free(delaystring);
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
}
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2187
direntry->d_name,
2188
O_RDONLY));
2189
if(hook_fd == -1){
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2192
}
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2196
}
2197
ret = dup2(devnull, STDIN_FILENO);
2198
if(ret == -1){
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2200
_exit(EX_OSERR);
2201
}
2202
ret = close(devnull);
2203
if(ret == -1){
2204
perror_plus("close");
2205
_exit(EX_OSERR);
2206
}
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
if(ret == -1){
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2210
_exit(EX_OSERR);
2211
}
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
environ) == -1){
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2216
}
2217
} else {
2218
if(hook_pid == -1){
2219
perror_plus("fork");
2220
free(direntry);
2221
continue;
2222
}
2223
int status;
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2226
free(direntry);
2227
continue;
2228
}
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2234
free(direntry);
2235
continue;
2236
}
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2240
WTERMSIG(status));
2241
free(direntry);
2242
continue;
1575
2243
} else {
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2246
free(direntry);
2247
continue;
2248
}
2249
}
2250
if(debug){
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2252
direntry->d_name);
2253
}
2254
free(direntry);
2255
}
2256
free(direntries);
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2259
} else {
2260
hookdir_fd = -1;
2261
}
2262
close(devnull);
1612
2263
}
1613
2264
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2267
const float delay){
2268
int old_errno = errno;
2269
int ret;
1620
2270
struct ifreq network;
1621
2271
unsigned int if_index = if_nametoindex(interface);
1622
2272
if(if_index == 0){
1631
2281
}
1632
2282
1633
2283
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
1635
2287
ret_errno = errno;
1636
2288
fprintf_plus(stderr, "Failed to get flags for interface "
1637
2289
"\"%s\"\n", interface);
2290
errno = old_errno;
1638
2291
return ret_errno;
1639
2292
}
1640
network.ifr_flags |= IFF_UP;
2293
network.ifr_flags |= IFF_UP; /* set flag */
1641
2294
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
1644
2297
ret_errno = errno;
1645
2298
perror_plus("socket");
1646
2299
errno = old_errno;
1647
2300
return ret_errno;
1648
2301
}
1649
2302
1650
2303
if(quit_now){
1651
close(sd);
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
1652
2308
errno = old_errno;
1653
2309
return EINTR;
1654
2310
}
1658
2314
interface);
1659
2315
}
1660
2316
1661
/* Raise priviliges */
1662
raise_privileges();
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2319
if(ret_errno != 0){
2320
errno = ret_errno;
2321
perror_plus("Failed to raise privileges");
2322
}
1663
2323
1664
2324
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
2325
int ret_linux;
2326
bool restore_loglevel = false;
2327
if(ret_errno == 0){
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2333
} else {
2334
restore_loglevel = true;
2335
}
1672
2336
}
1673
2337
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
1676
2340
#ifdef __linux__
1677
2341
if(restore_loglevel){
1678
2342
ret_linux = klogctl(7, NULL, 0);
1682
2346
}
1683
2347
#endif /* __linux__ */
1684
2348
1685
/* Lower privileges */
1686
lower_privileges();
2349
/* If raise_privileges() succeeded above */
2350
if(ret_errno == 0){
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2353
if(ret_errno != 0){
2354
errno = ret_errno;
2355
perror_plus("Failed to lower privileges");
2356
}
2357
}
1687
2358
1688
2359
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
ret = close(sd);
1690
2361
if(ret == -1){
1691
2362
perror_plus("close");
1692
2363
}
1693
2364
1694
2365
if(ret_setflags == -1){
1695
errno = ret_errno;
2366
errno = ioctl_errno;
1696
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
2368
errno = old_errno;
1698
return ret_errno;
2369
return ioctl_errno;
1699
2370
}
1700
2371
} else if(debug){
1701
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1704
2375
1705
2376
/* Sleep checking until interface is running.
1706
2377
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
2378
for(int i = 0; i < delay * 4; i++){
1708
2379
if(interface_is_running(interface)){
1709
2380
break;
1710
2381
}
1719
2390
return 0;
1720
2391
}
1721
2392
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1727
2396
struct ifreq network;
1728
2397
unsigned int if_index = if_nametoindex(interface);
1729
2398
if(if_index == 0){
1732
2401
return ENXIO;
1733
2402
}
1734
2403
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
1735
2406
if(not get_flags(interface, &network) and debug){
1736
2407
ret_errno = errno;
1737
2408
fprintf_plus(stderr, "Failed to get flags for interface "
1738
2409
"\"%s\"\n", interface);
2410
errno = old_errno;
1739
2411
return ret_errno;
1740
2412
}
1741
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
2414
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
1745
2417
ret_errno = errno;
1746
2418
perror_plus("socket");
1747
2419
errno = old_errno;
1753
2425
interface);
1754
2426
}
1755
2427
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2430
if(ret_errno != 0){
2431
errno = ret_errno;
2432
perror_plus("Failed to raise privileges");
2433
}
2434
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2437
2438
/* If raise_privileges() succeeded above */
2439
if(ret_errno == 0){
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2442
if(ret_errno != 0){
2443
errno = ret_errno;
2444
perror_plus("Failed to lower privileges");
2445
}
2446
}
1764
2447
1765
2448
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
int ret = close(sd);
1767
2450
if(ret == -1){
1768
2451
perror_plus("close");
1769
2452
}
1770
2453
1771
2454
if(ret_setflags == -1){
1772
errno = ret_errno;
2455
errno = ioctl_errno;
1773
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
2457
errno = old_errno;
1775
return ret_errno;
2458
return ioctl_errno;
1776
2459
}
1777
2460
} else if(debug){
1778
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1784
2467
}
1785
2468
1786
2469
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
1791
2483
AvahiSServiceBrowser *sb = NULL;
1792
2484
error_t ret_errno;
1793
2485
int ret;
1796
2488
int exitcode = EXIT_SUCCESS;
1797
2489
char *interfaces_to_take_down = NULL;
1798
2490
size_t interfaces_to_take_down_size = 0;
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1800
bool tempdir_created = false;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
1801
2494
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1802
2495
const char *seckey = PATHDIR "/" SECKEY;
1803
2496
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
#endif
2501
const char *dh_params_file = NULL;
1804
2502
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1806
2503
1807
2504
bool gnutls_initialized = false;
1808
2505
bool gpgme_initialized = false;
1854
2551
{ .name = "pubkey", .key = 'p',
1855
2552
.arg = "FILE",
1856
2553
.doc = "OpenPGP public key file base name",
1857
.group = 2 },
2554
.group = 1 },
2555
{ .name = "tls-privkey", .key = 't',
2556
.arg = "FILE",
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2559
#else
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2561
#endif
2562
.group = 1 },
2563
{ .name = "tls-pubkey", .key = 'T',
2564
.arg = "FILE",
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2567
#else
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2569
#endif
2570
.group = 1 },
1858
2571
{ .name = "dh-bits", .key = 129,
1859
2572
.arg = "BITS",
1860
2573
.doc = "Bit length of the prime number used in the"
1861
2574
" Diffie-Hellman key exchange",
1862
2575
.group = 2 },
2576
{ .name = "dh-params", .key = 134,
2577
.arg = "FILE",
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2580
.group = 2 },
1863
2581
{ .name = "priority", .key = 130,
1864
2582
.arg = "STRING",
1865
2583
.doc = "GnuTLS priority string for the TLS handshake",
1911
2629
case 'p': /* --pubkey */
1912
2630
pubkey = arg;
1913
2631
break;
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2634
tls_privkey = arg;
2635
#endif
2636
break;
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2639
tls_pubkey = arg;
2640
#endif
2641
break;
1914
2642
case 129: /* --dh-bits */
1915
2643
errno = 0;
1916
2644
tmpmax = strtoimax(arg, &tmp, 10);
1920
2648
}
1921
2649
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1922
2650
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
1923
2654
case 130: /* --priority */
1924
2655
mc.priority = arg;
1925
2656
break;
1948
2679
argp_state_help(state, state->out_stream,
1949
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1950
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
1951
2683
case -3: /* --usage */
1952
2684
argp_state_help(state, state->out_stream,
1953
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
1954
2687
case 'V': /* --version */
1955
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1956
2689
exit(argp_err_exit_status);
1965
2698
.args_doc = "",
1966
2699
.doc = "Mandos client -- Get and decrypt"
1967
2700
" passwords from a Mandos server" };
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1970
switch(ret){
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
1971
2704
case 0:
1972
2705
break;
1973
2706
case ENOMEM:
1974
2707
default:
1975
errno = ret;
2708
errno = ret_errno;
1976
2709
perror_plus("argp_parse");
1977
2710
exitcode = EX_OSERR;
1978
2711
goto end;
1981
2714
goto end;
1982
2715
}
1983
2716
}
1984
2717
1985
2718
{
1986
2719
/* Work around Debian bug #633582:
1987
<http://bugs.debian.org/633582> */
2720
<https://bugs.debian.org/633582> */
1988
2721
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2726
perror_plus("Failed to raise privileges");
2727
} else {
1991
2728
struct stat st;
1992
2729
1993
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
2744
}
2008
2745
}
2009
2746
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
close(seckey_fd);
2011
2748
}
2012
2749
}
2013
2750
2014
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
2752
int pubkey_fd = open(pubkey, O_RDONLY);
2016
2753
if(pubkey_fd == -1){
2028
2765
}
2029
2766
}
2030
2767
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2768
close(pubkey_fd);
2769
}
2770
}
2771
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2777
} else {
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
if(ret == -1){
2780
perror_plus("fstat");
2781
} else {
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2785
if(ret == -1){
2786
perror_plus("fchown");
2787
}
2788
}
2789
}
2790
close(dhparams_fd);
2791
}
2792
}
2793
2035
2794
/* Lower privileges */
2036
lower_privileges();
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2799
}
2037
2800
}
2038
2801
}
2039
2802
2063
2826
goto end;
2064
2827
}
2065
2828
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
}
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
2074
2833
}
2075
2834
2076
2835
if(not debug){
2154
2913
2155
2914
/* If no interfaces were specified, make a list */
2156
2915
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2916
struct dirent **direntries = NULL;
2158
2917
/* Look for any good interfaces */
2159
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2160
2919
alphasort);
2164
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
2924
direntries[i]->d_name);
2166
2925
if(ret_errno != 0){
2926
errno = ret_errno;
2167
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2168
2929
continue;
2169
2930
}
2170
2931
if(debug){
2171
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
2933
direntries[i]->d_name);
2173
2934
}
2935
free(direntries[i]);
2174
2936
}
2175
2937
free(direntries);
2176
2938
} else {
2177
free(direntries);
2939
if(ret == 0){
2940
free(direntries);
2941
}
2178
2942
fprintf_plus(stderr, "Could not find a network interface\n");
2179
2943
exitcode = EXIT_FAILURE;
2180
2944
goto end;
2181
2945
}
2182
2946
}
2183
2947
2184
/* Bring up interfaces which are down */
2948
/* Bring up interfaces which are down, and remove any "none"s */
2185
2949
{
2186
2950
char *interface = NULL;
2187
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2203
2967
break;
2204
2968
}
2205
2969
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2970
errno = bring_up_interface(interface, delay);
2207
2971
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2972
if(errno != 0){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2211
2975
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2978
interface);
2979
if(errno != 0){
2980
perror_plus("argz_add");
2981
}
2215
2982
}
2216
2983
}
2217
2984
}
2233
3000
goto end;
2234
3001
}
2235
3002
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#else
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3009
#endif
2237
3010
if(ret == -1){
2238
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
2239
3012
exitcode = EX_UNAVAILABLE;
2246
3019
goto end;
2247
3020
}
2248
3021
2249
if(mkdtemp(tempdir) == NULL){
3022
/* Try /run/tmp before /tmp */
3023
tempdir = mkdtemp(run_tempdir);
3024
if(tempdir == NULL and errno == ENOENT){
3025
if(debug){
3026
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3027
run_tempdir, old_tempdir);
3028
}
3029
tempdir = mkdtemp(old_tempdir);
3030
}
3031
if(tempdir == NULL){
2250
3032
perror_plus("mkdtemp");
2251
3033
goto end;
2252
3034
}
2253
tempdir_created = true;
2254
3035
2255
3036
if(quit_now){
2256
3037
goto end;
2328
3109
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
3110
(int)retry_interval);
2330
3111
}
2331
sleep((int)retry_interval);
3112
sleep((unsigned int)retry_interval);
2332
3113
}
2333
3114
2334
if (not quit_now){
3115
if(not quit_now){
2335
3116
exitcode = EXIT_SUCCESS;
2336
3117
}
2337
3118
2353
3134
2354
3135
/* Allocate a new server */
2355
3136
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
3137
&config, NULL, NULL, &ret);
2357
3138
2358
3139
/* Free the Avahi configuration data */
2359
3140
avahi_server_config_free(&config);
2362
3143
/* Check if creating the Avahi server object succeeded */
2363
3144
if(mc.server == NULL){
2364
3145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
3146
avahi_strerror(ret));
2366
3147
exitcode = EX_UNAVAILABLE;
2367
3148
goto end;
2368
3149
}
2392
3173
if(debug){
2393
3174
fprintf_plus(stderr, "Starting Avahi loop search\n");
2394
3175
}
2395
3176
2396
3177
ret = avahi_loop_with_timeout(simple_poll,
2397
3178
(int)(retry_interval * 1000), &mc);
2398
3179
if(debug){
2403
3184
end:
2404
3185
2405
3186
if(debug){
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3191
} else {
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
}
2407
3194
}
2408
3195
2409
3196
/* Cleanup things */
2420
3207
2421
3208
if(gnutls_initialized){
2422
3209
gnutls_certificate_free_credentials(mc.cred);
2423
gnutls_global_deinit();
2424
3210
gnutls_dh_params_deinit(mc.dh_params);
2425
3211
}
2426
3212
2434
3220
mc.current_server->prev->next = NULL;
2435
3221
while(mc.current_server != NULL){
2436
3222
server *next = mc.current_server->next;
3223
#ifdef __GNUC__
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
#endif
3227
free((char *)(mc.current_server->ip));
3228
#ifdef __GNUC__
3229
#pragma GCC diagnostic pop
3230
#endif
2437
3231
free(mc.current_server);
2438
3232
mc.current_server = next;
2439
3233
}
2440
3234
}
2441
3235
2442
/* Re-raise priviliges */
3236
/* Re-raise privileges */
2443
3237
{
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2460
}
2461
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2465
}
2466
}
2467
2468
lower_privileges_permanently();
3238
ret = raise_privileges();
3239
if(ret != 0){
3240
errno = ret;
3241
perror_plus("Failed to raise privileges");
3242
} else {
3243
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3247
3248
/* Take down the network interfaces which were brought up */
3249
{
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3253
interface))){
3254
ret = take_down_interface(interface);
3255
if(ret != 0){
3256
errno = ret;
3257
perror_plus("Failed to take down interface");
3258
}
3259
}
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3262
" down\n");
3263
}
3264
}
3265
}
3266
3267
ret = lower_privileges_permanently();
3268
if(ret != 0){
3269
errno = ret;
3270
perror_plus("Failed to lower privileges permanently");
3271
}
2469
3272
}
2470
3273
2471
3274
free(interfaces_to_take_down);
2472
3275
free(interfaces_hooks);
2473
3276
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
3279
struct dirent **direntries = NULL;
3280
int dret;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3282
O_RDONLY
3283
| O_NOFOLLOW
3284
| O_DIRECTORY
3285
| O_PATH));
3286
if(dir_fd == -1){
3287
perror_plus("open");
3288
return;
3289
}
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3294
if(debug){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3297
}
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(dret == -1){
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3302
AT_REMOVEDIR);
3303
}
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3309
dret = 0;
3310
}
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3314
}
3315
}
3316
free(direntries[i]);
3317
}
3318
3319
/* need to clean even if 0 because man page doesn't specify */
3320
free(direntries);
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3324
}
3325
} else {
3326
perror_plus("scandirat");
3327
}
3328
close(dir_fd);
3329
}
3330
2474
3331
/* Removes the GPGME temp directory and all files inside */
2475
if(tempdir_created){
2476
struct dirent **direntries = NULL;
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
2481
for(int i = 0; i < numentries; i++){
2482
direntry = direntries[i];
2483
char *fullname = NULL;
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
2485
direntry->d_name);
2486
if(ret < 0){
2487
perror_plus("asprintf");
2488
continue;
2489
}
2490
ret = remove(fullname);
2491
if(ret == -1){
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2494
}
2495
free(fullname);
2496
}
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
2503
}
2504
ret = rmdir(tempdir);
2505
if(ret == -1 and errno != ENOENT){
2506
perror_plus("rmdir");
2507
}
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
2508
3334
}
2509
3335
2510
3336
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0