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- Committer: Teddy Hogeborn
- Date: 2014-06-08 03:10:08 UTC
- Revision ID: teddy@recompile.se-20140608031008-mc9bd7b024a3q0y0
Address a very theoretical possible security issue in mandos-client.
If there were to run some sort of "cleaner" process for /run/tmp (or
/tmp), and mandos-client were to run for long enough for that cleaner
process to remove the temporary directory for GPGME, there was a
possibility that another unprivileged process could trick the (also
unprivileged) mandos-client process to remove other files or symlinks
which the unprivileged mandos-client process was allowed to remove.
This is not currently known to have been exploitable, since there are
no known initramfs environments running such cleaner processes.
* plugins.d/mandos-client.c (main): Use O_NOFOLLOW when opening
tempdir for cleaning.
If there were to run some sort of "cleaner" process for /run/tmp (or
/tmp), and mandos-client were to run for long enough for that cleaner
process to remove the temporary directory for GPGME, there was a
possibility that another unprivileged process could trick the (also
unprivileged) mandos-client process to remove other files or symlinks
which the unprivileged mandos-client process was allowed to remove.
This is not currently known to have been exploitable, since there are
no known initramfs environments running such cleaner processes.
* plugins.d/mandos-client.c (main): Use O_NOFOLLOW when opening
tempdir for cleaning.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- plugin-helpers
- 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 © 2008-2021 Teddy Hogeborn
13
* Copyright © 2008-2021 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
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
38
37
#define _FILE_OFFSET_BITS 64
39
38
#endif /* not _FILE_OFFSET_BITS */
40
39
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
96
strsignal() */
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
103
S_IXOTH, lstat() */
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
80
#include <argp.h> /* struct argp_option, error_t, struct
81
argp_state, struct argp,
82
argp_parse(), ARGP_KEY_ARG,
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
111
91
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
114
WTERMSIG() */
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
118
SIG_IGN, raise() */
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
129
strtoimax() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
132
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
97
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
138
98
139
99
#ifdef __linux__
140
100
#include <sys/klog.h> /* klogctl() */
153
113
154
114
/* GnuTLS */
155
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
116
functions:
117
gnutls_*
118
init_gnutls_session(),
119
GNUTLS_* */
158
120
#include <gnutls/openpgp.h>
159
121
/* gnutls_certificate_set_openpgp_key_file(),
160
122
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
164
#endif
165
123
166
124
/* GPGME */
167
125
#include <gpgme.h> /* All GPGME types, constants and
168
126
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
127
gpgme_*
128
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_* */
172
130
173
131
#define BUFFER_SIZE 256
174
132
175
133
#define PATHDIR "/conf/conf.d/mandos"
176
134
#define SECKEY "seckey.txt"
177
135
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
137
182
138
bool debug = false;
278
234
.af = af };
279
235
if(new_server->ip == NULL){
280
236
perror_plus("strdup");
281
free(new_server);
282
237
return false;
283
238
}
284
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
285
240
if(ret == -1){
286
241
perror_plus("clock_gettime");
287
#ifdef __GNUC__
288
#pragma GCC diagnostic push
289
#pragma GCC diagnostic ignored "-Wcast-qual"
290
#endif
291
free((char *)(new_server->ip));
292
#ifdef __GNUC__
293
#pragma GCC diagnostic pop
294
#endif
295
free(new_server);
296
242
return false;
297
243
}
298
244
/* Special case of first server */
310
256
return true;
311
257
}
312
258
313
/* Set effective uid to 0, return errno */
314
__attribute__((warn_unused_result))
315
int raise_privileges(void){
316
int old_errno = errno;
317
int ret = 0;
318
if(seteuid(0) == -1){
319
ret = errno;
320
}
321
errno = old_errno;
322
return ret;
323
}
324
325
/* Set effective and real user ID to 0. Return errno. */
326
__attribute__((warn_unused_result))
327
int raise_privileges_permanently(void){
328
int old_errno = errno;
329
int ret = raise_privileges();
330
if(ret != 0){
331
errno = old_errno;
332
return ret;
333
}
334
if(setuid(0) == -1){
335
ret = errno;
336
}
337
errno = old_errno;
338
return ret;
339
}
340
341
/* Set effective user ID to unprivileged saved user ID */
342
__attribute__((warn_unused_result))
343
int lower_privileges(void){
344
int old_errno = errno;
345
int ret = 0;
346
if(seteuid(uid) == -1){
347
ret = errno;
348
}
349
errno = old_errno;
350
return ret;
351
}
352
353
/* Lower privileges permanently */
354
__attribute__((warn_unused_result))
355
int lower_privileges_permanently(void){
356
int old_errno = errno;
357
int ret = 0;
358
if(setuid(uid) == -1){
359
ret = errno;
360
}
361
errno = old_errno;
362
return ret;
363
}
364
365
259
/*
366
260
* Initialize GPGME.
367
261
*/
387
281
return false;
388
282
}
389
283
390
/* Workaround for systems without a real-time clock; see also
391
Debian bug #894495: <https://bugs.debian.org/894495> */
392
do {
393
{
394
time_t currtime = time(NULL);
395
if(currtime != (time_t)-1){
396
struct tm tm;
397
if(gmtime_r(&currtime, &tm) == NULL) {
398
perror_plus("gmtime_r");
399
break;
400
}
401
if(tm.tm_year != 70 or tm.tm_mon != 0){
402
break;
403
}
404
if(debug){
405
fprintf_plus(stderr, "System clock is January 1970");
406
}
407
} else {
408
if(debug){
409
fprintf_plus(stderr, "System clock is invalid");
410
}
411
}
412
}
413
struct stat keystat;
414
ret = fstat(fd, &keystat);
415
if(ret != 0){
416
perror_plus("fstat");
417
break;
418
}
419
ret = raise_privileges();
420
if(ret != 0){
421
errno = ret;
422
perror_plus("Failed to raise privileges");
423
break;
424
}
425
if(debug){
426
fprintf_plus(stderr,
427
"Setting system clock to key file mtime");
428
}
429
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
430
perror_plus("clock_settime");
431
}
432
ret = lower_privileges();
433
if(ret != 0){
434
errno = ret;
435
perror_plus("Failed to lower privileges");
436
}
437
} while(false);
438
439
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
285
if(rc != GPG_ERR_NO_ERROR){
441
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
294
gpgme_strsource(rc), gpgme_strerror(rc));
450
295
return false;
451
296
}
452
{
453
gpgme_import_result_t import_result
454
= gpgme_op_import_result(mc->ctx);
455
if((import_result->imported < 1
456
or import_result->not_imported > 0)
457
and import_result->unchanged == 0){
458
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
459
fprintf_plus(stderr,
460
"The total number of considered keys: %d\n",
461
import_result->considered);
462
fprintf_plus(stderr,
463
"The number of keys without user ID: %d\n",
464
import_result->no_user_id);
465
fprintf_plus(stderr,
466
"The total number of imported keys: %d\n",
467
import_result->imported);
468
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
469
import_result->imported_rsa);
470
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
471
import_result->unchanged);
472
fprintf_plus(stderr, "The number of new user IDs: %d\n",
473
import_result->new_user_ids);
474
fprintf_plus(stderr, "The number of new sub keys: %d\n",
475
import_result->new_sub_keys);
476
fprintf_plus(stderr, "The number of new signatures: %d\n",
477
import_result->new_signatures);
478
fprintf_plus(stderr, "The number of new revocations: %d\n",
479
import_result->new_revocations);
480
fprintf_plus(stderr,
481
"The total number of secret keys read: %d\n",
482
import_result->secret_read);
483
fprintf_plus(stderr,
484
"The number of imported secret keys: %d\n",
485
import_result->secret_imported);
486
fprintf_plus(stderr,
487
"The number of unchanged secret keys: %d\n",
488
import_result->secret_unchanged);
489
fprintf_plus(stderr, "The number of keys not imported: %d\n",
490
import_result->not_imported);
491
for(gpgme_import_status_t import_status
492
= import_result->imports;
493
import_status != NULL;
494
import_status = import_status->next){
495
fprintf_plus(stderr, "Import status for key: %s\n",
496
import_status->fpr);
497
if(import_status->result != GPG_ERR_NO_ERROR){
498
fprintf_plus(stderr, "Import result: %s: %s\n",
499
gpgme_strsource(import_status->result),
500
gpgme_strerror(import_status->result));
501
}
502
fprintf_plus(stderr, "Key status:\n");
503
fprintf_plus(stderr,
504
import_status->status & GPGME_IMPORT_NEW
505
? "The key was new.\n"
506
: "The key was not new.\n");
507
fprintf_plus(stderr,
508
import_status->status & GPGME_IMPORT_UID
509
? "The key contained new user IDs.\n"
510
: "The key did not contain new user IDs.\n");
511
fprintf_plus(stderr,
512
import_status->status & GPGME_IMPORT_SIG
513
? "The key contained new signatures.\n"
514
: "The key did not contain new signatures.\n");
515
fprintf_plus(stderr,
516
import_status->status & GPGME_IMPORT_SUBKEY
517
? "The key contained new sub keys.\n"
518
: "The key did not contain new sub keys.\n");
519
fprintf_plus(stderr,
520
import_status->status & GPGME_IMPORT_SECRET
521
? "The key contained a secret key.\n"
522
: "The key did not contain a secret key.\n");
523
}
524
return false;
525
}
526
}
527
297
528
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
299
if(ret == -1){
530
300
perror_plus("close");
531
301
}
570
340
/* Create new GPGME "context" */
571
341
rc = gpgme_new(&(mc->ctx));
572
342
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
575
346
return false;
576
347
}
577
348
613
384
/* Create new empty GPGME data buffer for the plaintext */
614
385
rc = gpgme_data_new(&dh_plain);
615
386
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
617
389
gpgme_strsource(rc), gpgme_strerror(rc));
618
390
gpgme_data_release(dh_crypto);
619
391
return -1;
632
404
if(result == NULL){
633
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
406
} else {
635
if(result->unsupported_algorithm != NULL) {
636
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
637
result->unsupported_algorithm);
638
}
639
fprintf_plus(stderr, "Wrong key usage: %s\n",
640
result->wrong_key_usage ? "Yes" : "No");
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
641
411
if(result->file_name != NULL){
642
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
413
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
414
gpgme_recipient_t recipient;
415
recipient = result->recipients;
416
while(recipient != NULL){
647
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
421
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
652
425
}
653
426
}
654
427
}
710
483
return plaintext_length;
711
484
}
712
485
713
__attribute__((warn_unused_result, const))
714
static const char *safe_string(const char *str){
715
if(str == NULL)
716
return "(unknown)";
717
return str;
718
}
719
720
486
__attribute__((warn_unused_result))
721
487
static const char *safer_gnutls_strerror(int value){
722
488
const char *ret = gnutls_strerror(value);
723
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
724
492
}
725
493
726
494
/* GnuTLS log function callback */
730
498
fprintf_plus(stderr, "GnuTLS: %s", string);
731
499
}
732
500
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
734
502
static int init_gnutls_global(const char *pubkeyfilename,
735
503
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
504
mandos_context *mc){
738
505
int ret;
739
506
741
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
509
}
743
510
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
744
518
if(debug){
745
519
/* "Use a log level over 10 to enable all debugging options."
746
520
* - GnuTLS manual
754
528
if(ret != GNUTLS_E_SUCCESS){
755
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
757
532
return -1;
758
533
}
759
534
760
535
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
763
538
pubkeyfilename,
764
539
seckeyfilename);
765
540
}
766
541
767
#if GNUTLS_VERSION_NUMBER >= 0x030606
768
ret = gnutls_certificate_set_rawpk_key_file
769
(mc->cred, pubkeyfilename, seckeyfilename,
770
GNUTLS_X509_FMT_PEM, /* format */
771
NULL, /* pass */
772
/* key_usage */
773
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
774
NULL, /* names */
775
0, /* names_length */
776
/* privkey_flags */
777
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
778
0); /* pkcs11_flags */
779
#elif GNUTLS_VERSION_NUMBER < 0x030600
780
542
ret = gnutls_certificate_set_openpgp_key_file
781
543
(mc->cred, pubkeyfilename, seckeyfilename,
782
544
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
545
if(ret != GNUTLS_E_SUCCESS){
787
546
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
550
safer_gnutls_strerror(ret));
800
559
safer_gnutls_strerror(ret));
801
560
goto globalfail;
802
561
}
803
/* If a Diffie-Hellman parameters file was given, try to use it */
804
if(dhparamsfilename != NULL){
805
gnutls_datum_t params = { .data = NULL, .size = 0 };
806
do {
807
int dhpfile = open(dhparamsfilename, O_RDONLY);
808
if(dhpfile == -1){
809
perror_plus("open");
810
dhparamsfilename = NULL;
811
break;
812
}
813
size_t params_capacity = 0;
814
while(true){
815
params_capacity = incbuffer((char **)¶ms.data,
816
(size_t)params.size,
817
(size_t)params_capacity);
818
if(params_capacity == 0){
819
perror_plus("incbuffer");
820
free(params.data);
821
params.data = NULL;
822
dhparamsfilename = NULL;
823
break;
824
}
825
ssize_t bytes_read = read(dhpfile,
826
params.data + params.size,
827
BUFFER_SIZE);
828
/* EOF */
829
if(bytes_read == 0){
830
break;
831
}
832
/* check bytes_read for failure */
833
if(bytes_read < 0){
834
perror_plus("read");
835
free(params.data);
836
params.data = NULL;
837
dhparamsfilename = NULL;
838
break;
839
}
840
params.size += (unsigned int)bytes_read;
841
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
846
if(params.data == NULL){
847
dhparamsfilename = NULL;
848
}
849
if(dhparamsfilename == NULL){
850
break;
851
}
852
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
853
GNUTLS_X509_FMT_PEM);
854
if(ret != GNUTLS_E_SUCCESS){
855
fprintf_plus(stderr, "Failed to parse DH parameters in file"
856
" \"%s\": %s\n", dhparamsfilename,
857
safer_gnutls_strerror(ret));
858
dhparamsfilename = NULL;
859
}
860
free(params.data);
861
} while(false);
862
}
863
if(dhparamsfilename == NULL){
864
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
/* Find out the optimal number of DH bits */
867
/* Try to read the private key file */
868
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
869
do {
870
int secfile = open(seckeyfilename, O_RDONLY);
871
if(secfile == -1){
872
perror_plus("open");
873
break;
874
}
875
size_t buffer_capacity = 0;
876
while(true){
877
buffer_capacity = incbuffer((char **)&buffer.data,
878
(size_t)buffer.size,
879
(size_t)buffer_capacity);
880
if(buffer_capacity == 0){
881
perror_plus("incbuffer");
882
free(buffer.data);
883
buffer.data = NULL;
884
break;
885
}
886
ssize_t bytes_read = read(secfile,
887
buffer.data + buffer.size,
888
BUFFER_SIZE);
889
/* EOF */
890
if(bytes_read == 0){
891
break;
892
}
893
/* check bytes_read for failure */
894
if(bytes_read < 0){
895
perror_plus("read");
896
free(buffer.data);
897
buffer.data = NULL;
898
break;
899
}
900
buffer.size += (unsigned int)bytes_read;
901
}
902
close(secfile);
903
} while(false);
904
/* If successful, use buffer to parse private key */
905
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
906
if(buffer.data != NULL){
907
{
908
gnutls_openpgp_privkey_t privkey = NULL;
909
ret = gnutls_openpgp_privkey_init(&privkey);
910
if(ret != GNUTLS_E_SUCCESS){
911
fprintf_plus(stderr, "Error initializing OpenPGP key"
912
" structure: %s",
913
safer_gnutls_strerror(ret));
914
free(buffer.data);
915
buffer.data = NULL;
916
} else {
917
ret = gnutls_openpgp_privkey_import
918
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
919
if(ret != GNUTLS_E_SUCCESS){
920
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
921
safer_gnutls_strerror(ret));
922
privkey = NULL;
923
}
924
free(buffer.data);
925
buffer.data = NULL;
926
if(privkey != NULL){
927
/* Use private key to suggest an appropriate
928
sec_param */
929
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
930
gnutls_openpgp_privkey_deinit(privkey);
931
if(debug){
932
fprintf_plus(stderr, "This OpenPGP key implies using"
933
" a GnuTLS security parameter \"%s\".\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)));
936
}
937
}
938
}
939
}
940
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
941
/* Err on the side of caution */
942
sec_param = GNUTLS_SEC_PARAM_ULTRA;
943
if(debug){
944
fprintf_plus(stderr, "Falling back to security parameter"
945
" \"%s\"\n",
946
safe_string(gnutls_sec_param_get_name
947
(sec_param)));
948
}
949
}
950
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
if(uret != 0){
953
mc->dh_bits = uret;
954
if(debug){
955
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
956
" implies %u DH bits; using that.\n",
957
safe_string(gnutls_sec_param_get_name
958
(sec_param)),
959
mc->dh_bits);
960
}
961
} else {
962
fprintf_plus(stderr, "Failed to get implied number of DH"
963
" bits for security parameter \"%s\"): %s\n",
964
safe_string(gnutls_sec_param_get_name
965
(sec_param)),
966
safer_gnutls_strerror(ret));
967
goto globalfail;
968
}
969
#endif
970
} else { /* dh_bits != 0 */
971
if(debug){
972
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
973
mc->dh_bits);
974
}
975
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
976
if(ret != GNUTLS_E_SUCCESS){
977
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
978
" bits): %s\n", mc->dh_bits,
979
safer_gnutls_strerror(ret));
980
goto globalfail;
981
}
982
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
983
}
984
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
570
986
571
return 0;
987
572
988
573
globalfail:
989
574
990
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
991
577
gnutls_dh_params_deinit(mc->dh_params);
992
578
return -1;
993
579
}
998
584
int ret;
999
585
/* GnuTLS session creation */
1000
586
do {
1001
ret = gnutls_init(session, (GNUTLS_SERVER
1002
#if GNUTLS_VERSION_NUMBER >= 0x030506
1003
| GNUTLS_NO_TICKETS
1004
#endif
1005
#if GNUTLS_VERSION_NUMBER >= 0x030606
1006
| GNUTLS_ENABLE_RAWPK
1007
#endif
1008
));
587
ret = gnutls_init(session, GNUTLS_SERVER);
1009
588
if(quit_now){
1010
589
return -1;
1011
590
}
1052
631
/* ignore client certificate if any. */
1053
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1054
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
1055
636
return 0;
1056
637
}
1057
638
1059
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
641
__attribute__((unused)) const char *txt){}
1061
642
1062
/* Helper function to add_local_route() and delete_local_route() */
1063
__attribute__((nonnull, warn_unused_result))
1064
static bool add_delete_local_route(const bool add,
1065
const char *address,
1066
AvahiIfIndex if_index){
1067
int ret;
1068
char helper[] = "mandos-client-iprouteadddel";
1069
char add_arg[] = "add";
1070
char delete_arg[] = "delete";
1071
char debug_flag[] = "--debug";
1072
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1073
if(pluginhelperdir == NULL){
1074
if(debug){
1075
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1076
" variable not set; cannot run helper\n");
1077
}
1078
return false;
1079
}
1080
1081
char interface[IF_NAMESIZE];
1082
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1083
perror_plus("if_indextoname");
1084
return false;
1085
}
1086
1087
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1088
if(devnull == -1){
1089
perror_plus("open(\"/dev/null\", O_RDONLY)");
1090
return false;
1091
}
1092
pid_t pid = fork();
1093
if(pid == 0){
1094
/* Child */
1095
/* Raise privileges */
1096
errno = raise_privileges_permanently();
1097
if(errno != 0){
1098
perror_plus("Failed to raise privileges");
1099
/* _exit(EX_NOPERM); */
1100
} else {
1101
/* Set group */
1102
errno = 0;
1103
ret = setgid(0);
1104
if(ret == -1){
1105
perror_plus("setgid");
1106
close(devnull);
1107
_exit(EX_NOPERM);
1108
}
1109
/* Reset supplementary groups */
1110
errno = 0;
1111
ret = setgroups(0, NULL);
1112
if(ret == -1){
1113
perror_plus("setgroups");
1114
close(devnull);
1115
_exit(EX_NOPERM);
1116
}
1117
}
1118
ret = dup2(devnull, STDIN_FILENO);
1119
if(ret == -1){
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
_exit(EX_OSERR);
1123
}
1124
ret = close(devnull);
1125
if(ret == -1){
1126
perror_plus("close");
1127
}
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
if(ret == -1){
1130
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1131
_exit(EX_OSERR);
1132
}
1133
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1134
O_RDONLY
1135
| O_DIRECTORY
1136
| O_PATH
1137
| O_CLOEXEC));
1138
if(helperdir_fd == -1){
1139
perror_plus("open");
1140
_exit(EX_UNAVAILABLE);
1141
}
1142
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1143
helper, O_RDONLY));
1144
if(helper_fd == -1){
1145
perror_plus("openat");
1146
close(helperdir_fd);
1147
_exit(EX_UNAVAILABLE);
1148
}
1149
close(helperdir_fd);
1150
#ifdef __GNUC__
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wcast-qual"
1153
#endif
1154
if(fexecve(helper_fd, (char *const [])
1155
{ helper, add ? add_arg : delete_arg, (char *)address,
1156
interface, debug ? debug_flag : NULL, NULL },
1157
environ) == -1){
1158
#ifdef __GNUC__
1159
#pragma GCC diagnostic pop
1160
#endif
1161
perror_plus("fexecve");
1162
_exit(EXIT_FAILURE);
1163
}
1164
}
1165
if(pid == -1){
1166
perror_plus("fork");
1167
close(devnull);
1168
return false;
1169
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
int status;
1175
pid_t pret = -1;
1176
errno = 0;
1177
do {
1178
pret = waitpid(pid, &status, 0);
1179
if(pret == -1 and errno == EINTR and quit_now){
1180
int errno_raising = 0;
1181
if((errno = raise_privileges()) != 0){
1182
errno_raising = errno;
1183
perror_plus("Failed to raise privileges in order to"
1184
" kill helper program");
1185
}
1186
if(kill(pid, SIGTERM) == -1){
1187
perror_plus("kill");
1188
}
1189
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1190
perror_plus("Failed to lower privileges after killing"
1191
" helper program");
1192
}
1193
return false;
1194
}
1195
} while(pret == -1 and errno == EINTR);
1196
if(pret == -1){
1197
perror_plus("waitpid");
1198
return false;
1199
}
1200
if(WIFEXITED(status)){
1201
if(WEXITSTATUS(status) != 0){
1202
fprintf_plus(stderr, "Error: iprouteadddel exited"
1203
" with status %d\n", WEXITSTATUS(status));
1204
return false;
1205
}
1206
return true;
1207
}
1208
if(WIFSIGNALED(status)){
1209
fprintf_plus(stderr, "Error: iprouteadddel died by"
1210
" signal %d\n", WTERMSIG(status));
1211
return false;
1212
}
1213
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1214
return false;
1215
}
1216
1217
__attribute__((nonnull, warn_unused_result))
1218
static bool add_local_route(const char *address,
1219
AvahiIfIndex if_index){
1220
if(debug){
1221
fprintf_plus(stderr, "Adding route to %s\n", address);
1222
}
1223
return add_delete_local_route(true, address, if_index);
1224
}
1225
1226
__attribute__((nonnull, warn_unused_result))
1227
static bool delete_local_route(const char *address,
1228
AvahiIfIndex if_index){
1229
if(debug){
1230
fprintf_plus(stderr, "Removing route to %s\n", address);
1231
}
1232
return add_delete_local_route(false, address, if_index);
1233
}
1234
1235
643
/* Called when a Mandos server is found */
1236
644
__attribute__((nonnull, warn_unused_result))
1237
645
static int start_mandos_communication(const char *ip, in_port_t port,
1248
656
int retval = -1;
1249
657
gnutls_session_t session;
1250
658
int pf; /* Protocol family */
1251
bool route_added = false;
1252
659
1253
660
errno = 0;
1254
661
1276
683
bool match = false;
1277
684
{
1278
685
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1282
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
689
match = true;
1284
690
break;
1313
719
PRIuMAX "\n", ip, (uintmax_t)port);
1314
720
}
1315
721
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1317
723
if(tcp_sd < 0){
1318
724
int e = errno;
1319
725
perror_plus("socket");
1326
732
goto mandos_end;
1327
733
}
1328
734
735
memset(&to, 0, sizeof(to));
1329
736
if(af == AF_INET6){
1330
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1331
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1332
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1333
739
} else { /* IPv4 */
1334
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1335
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1336
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1337
742
}
1338
743
if(ret < 0 ){
1339
744
int e = errno;
1409
814
goto mandos_end;
1410
815
}
1411
816
1412
while(true){
1413
if(af == AF_INET6){
1414
ret = connect(tcp_sd, (struct sockaddr *)&to,
1415
sizeof(struct sockaddr_in6));
1416
} else {
1417
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1418
sizeof(struct sockaddr_in));
1419
}
1420
if(ret < 0){
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1422
and if_index != AVAHI_IF_UNSPEC
1423
and connect_to == NULL
1424
and not route_added and
1425
((af == AF_INET6 and not
1426
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1427
&to)->sin6_addr)))
1428
or (af == AF_INET and
1429
/* Not a a IPv4LL address */
1430
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1431
& 0xFFFF0000L) != 0xA9FE0000L))){
1432
/* Work around Avahi bug - Avahi does not announce link-local
1433
addresses if it has a global address, so local hosts with
1434
*only* a link-local address (e.g. Mandos clients) cannot
1435
connect to a Mandos server announced by Avahi on a server
1436
host with a global address. Work around this by retrying
1437
with an explicit route added with the server's address.
1438
1439
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
https://bugs.debian.org/587961
1442
*/
1443
if(debug){
1444
fprintf_plus(stderr, "Mandos server unreachable, trying"
1445
" direct route\n");
1446
}
1447
int e = errno;
1448
route_added = add_local_route(ip, if_index);
1449
if(route_added){
1450
continue;
1451
}
1452
errno = e;
1453
}
1454
if(errno != ECONNREFUSED or debug){
1455
int e = errno;
1456
perror_plus("connect");
1457
errno = e;
1458
}
1459
goto mandos_end;
1460
}
1461
1462
if(quit_now){
1463
errno = EINTR;
1464
goto mandos_end;
1465
}
1466
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1467
836
}
1468
837
1469
838
const char *out = mandos_protocol_version;
1623
992
&decrypted_buffer, mc);
1624
993
if(decrypted_buffer_size >= 0){
1625
994
1626
clearerr(stdout);
1627
995
written = 0;
1628
996
while(written < (size_t) decrypted_buffer_size){
1629
997
if(quit_now){
1645
1013
}
1646
1014
written += (size_t)ret;
1647
1015
}
1648
ret = fflush(stdout);
1649
if(ret != 0){
1650
int e = errno;
1651
if(debug){
1652
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1653
strerror(errno));
1654
}
1655
errno = e;
1656
goto mandos_end;
1657
}
1658
1016
retval = 0;
1659
1017
}
1660
1018
}
1663
1021
1664
1022
mandos_end:
1665
1023
{
1666
if(route_added){
1667
if(not delete_local_route(ip, if_index)){
1668
fprintf_plus(stderr, "Failed to delete local route to %s on"
1669
" interface %d", ip, if_index);
1670
}
1671
}
1672
1024
int e = errno;
1673
1025
free(decrypted_buffer);
1674
1026
free(buffer);
1675
1027
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
1029
}
1678
1030
if(ret == -1){
1679
1031
if(e == 0){
1691
1043
return retval;
1692
1044
}
1693
1045
1046
__attribute__((nonnull))
1694
1047
static void resolve_callback(AvahiSServiceResolver *r,
1695
1048
AvahiIfIndex interface,
1696
1049
AvahiProtocol proto,
1713
1066
timed out */
1714
1067
1715
1068
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1717
1069
return;
1718
1070
}
1719
1071
1833
1185
__attribute__((nonnull, warn_unused_result))
1834
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1187
int ret;
1836
int old_errno;
1188
error_t ret_errno;
1837
1189
1838
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1191
if(s < 0){
1840
old_errno = errno;
1192
ret_errno = errno;
1841
1193
perror_plus("socket");
1842
errno = old_errno;
1194
errno = ret_errno;
1843
1195
return false;
1844
1196
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1847
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1199
if(ret == -1){
1849
1200
if(debug){
1850
old_errno = errno;
1201
ret_errno = errno;
1851
1202
perror_plus("ioctl SIOCGIFFLAGS");
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1203
errno = ret_errno;
1858
1204
}
1859
1205
return false;
1860
1206
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1207
return true;
1867
1208
}
1868
1209
2110
1451
}
2111
1452
}
2112
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
2113
1510
__attribute__((nonnull))
2114
1511
void run_network_hooks(const char *mode, const char *interface,
2115
1512
const float delay){
2116
struct dirent **direntries = NULL;
1513
struct dirent **direntries;
2117
1514
if(hookdir_fd == -1){
2118
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2119
| O_CLOEXEC);
1515
hookdir_fd = open(hookdir, O_RDONLY);
2120
1516
if(hookdir_fd == -1){
2121
1517
if(errno == ENOENT){
2122
1518
if(debug){
2129
1525
return;
2130
1526
}
2131
1527
}
2132
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2133
if(devnull == -1){
2134
perror_plus("open(\"/dev/null\", O_RDONLY)");
2135
return;
2136
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
2137
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
2139
1540
if(numhooks == -1){
2140
1541
perror_plus("scandir");
2141
close(devnull);
2142
1542
return;
2143
1543
}
2144
1544
struct dirent *direntry;
2145
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
2146
1547
for(int i = 0; i < numhooks; i++){
2147
1548
direntry = direntries[i];
2148
1549
if(debug){
2153
1554
if(hook_pid == 0){
2154
1555
/* Child */
2155
1556
/* Raise privileges */
2156
errno = raise_privileges_permanently();
2157
if(errno != 0){
1557
if(raise_privileges_permanently() != 0){
2158
1558
perror_plus("Failed to raise privileges");
2159
1559
_exit(EX_NOPERM);
2160
1560
}
2172
1572
perror_plus("setgroups");
2173
1573
_exit(EX_NOPERM);
2174
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
2175
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2176
1591
if(ret == -1){
2177
1592
perror_plus("setenv");
2212
1627
_exit(EX_OSERR);
2213
1628
}
2214
1629
}
2215
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2216
direntry->d_name,
2217
O_RDONLY));
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2218
1631
if(hook_fd == -1){
2219
1632
perror_plus("openat");
2220
1633
_exit(EXIT_FAILURE);
2221
1634
}
2222
if(close(hookdir_fd) == -1){
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2223
1636
perror_plus("close");
2224
1637
_exit(EXIT_FAILURE);
2225
1638
}
2226
ret = dup2(devnull, STDIN_FILENO);
2227
if(ret == -1){
2228
perror_plus("dup2(devnull, STDIN_FILENO)");
2229
_exit(EX_OSERR);
2230
}
2231
ret = close(devnull);
2232
if(ret == -1){
2233
perror_plus("close");
2234
_exit(EX_OSERR);
2235
}
2236
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2237
if(ret == -1){
2238
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2239
_exit(EX_OSERR);
2240
}
2241
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2242
1640
environ) == -1){
2243
1641
perror_plus("fexecve");
2244
1642
_exit(EXIT_FAILURE);
2245
1643
}
2246
1644
} else {
2247
if(hook_pid == -1){
2248
perror_plus("fork");
2249
free(direntry);
2250
continue;
2251
}
2252
1645
int status;
2253
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2254
1647
perror_plus("waitpid");
2255
free(direntry);
2256
1648
continue;
2257
1649
}
2258
1650
if(WIFEXITED(status)){
2260
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2261
1653
" with status %d\n", direntry->d_name,
2262
1654
WEXITSTATUS(status));
2263
free(direntry);
2264
1655
continue;
2265
1656
}
2266
1657
} else if(WIFSIGNALED(status)){
2267
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2268
1659
" signal %d\n", direntry->d_name,
2269
1660
WTERMSIG(status));
2270
free(direntry);
2271
1661
continue;
2272
1662
} else {
2273
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
1664
" crashed\n", direntry->d_name);
2275
free(direntry);
2276
1665
continue;
2277
1666
}
2278
1667
}
2280
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2281
1670
direntry->d_name);
2282
1671
}
2283
free(direntry);
2284
1672
}
2285
free(direntries);
2286
if(close(hookdir_fd) == -1){
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2287
1674
perror_plus("close");
2288
1675
} else {
2289
1676
hookdir_fd = -1;
2292
1679
}
2293
1680
2294
1681
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
2298
1685
int ret;
2299
1686
struct ifreq network;
2300
1687
unsigned int if_index = if_nametoindex(interface);
2310
1697
}
2311
1698
2312
1699
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1700
error_t ret_errno = 0, ioctl_errno = 0;
2315
1701
if(not get_flags(interface, &network)){
2316
1702
ret_errno = errno;
2317
1703
fprintf_plus(stderr, "Failed to get flags for interface "
2330
1716
}
2331
1717
2332
1718
if(quit_now){
2333
ret = close(sd);
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2334
1720
if(ret == -1){
2335
1721
perror_plus("close");
2336
1722
}
2346
1732
/* Raise privileges */
2347
1733
ret_errno = raise_privileges();
2348
1734
if(ret_errno != 0){
2349
errno = ret_errno;
2350
1735
perror_plus("Failed to raise privileges");
2351
1736
}
2352
1737
2386
1771
}
2387
1772
2388
1773
/* Close the socket */
2389
ret = close(sd);
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
1775
if(ret == -1){
2391
1776
perror_plus("close");
2392
1777
}
2404
1789
2405
1790
/* Sleep checking until interface is running.
2406
1791
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
1792
for(int i=0; i < delay * 4; i++){
2408
1793
if(interface_is_running(interface)){
2409
1794
break;
2410
1795
}
2420
1805
}
2421
1806
2422
1807
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
2425
1810
struct ifreq network;
2426
1811
unsigned int if_index = if_nametoindex(interface);
2427
1812
if(if_index == 0){
2430
1815
return ENXIO;
2431
1816
}
2432
1817
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
1818
error_t ret_errno = 0, ioctl_errno = 0;
2435
1819
if(not get_flags(interface, &network) and debug){
2436
1820
ret_errno = errno;
2437
1821
fprintf_plus(stderr, "Failed to get flags for interface "
2457
1841
/* Raise privileges */
2458
1842
ret_errno = raise_privileges();
2459
1843
if(ret_errno != 0){
2460
errno = ret_errno;
2461
1844
perror_plus("Failed to raise privileges");
2462
1845
}
2463
1846
2475
1858
}
2476
1859
2477
1860
/* Close the socket */
2478
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
1862
if(ret == -1){
2480
1863
perror_plus("close");
2481
1864
}
2496
1879
}
2497
1880
2498
1881
int main(int argc, char *argv[]){
2499
mandos_context mc = { .server = NULL, .dh_bits = 0,
2500
#if GNUTLS_VERSION_NUMBER >= 0x030606
2501
.priority = "SECURE128:!CTYPE-X.509"
2502
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2503
":%PROFILE_ULTRA",
2504
#elif GNUTLS_VERSION_NUMBER < 0x030600
2505
.priority = "SECURE256:!CTYPE-X.509"
2506
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2507
#else
2508
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2509
#endif
2510
.current_server = NULL, .interfaces = NULL,
2511
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2512
1886
AvahiSServiceBrowser *sb = NULL;
2513
1887
error_t ret_errno;
2514
1888
int ret;
2523
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
1898
const char *seckey = PATHDIR "/" SECKEY;
2525
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
2527
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2528
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2529
#endif
2530
const char *dh_params_file = NULL;
2531
1900
char *interfaces_hooks = NULL;
2532
1901
2533
1902
bool gnutls_initialized = false;
2580
1949
{ .name = "pubkey", .key = 'p',
2581
1950
.arg = "FILE",
2582
1951
.doc = "OpenPGP public key file base name",
2583
.group = 1 },
2584
{ .name = "tls-privkey", .key = 't',
2585
.arg = "FILE",
2586
#if GNUTLS_VERSION_NUMBER >= 0x030606
2587
.doc = "TLS private key file base name",
2588
#else
2589
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2590
#endif
2591
.group = 1 },
2592
{ .name = "tls-pubkey", .key = 'T',
2593
.arg = "FILE",
2594
#if GNUTLS_VERSION_NUMBER >= 0x030606
2595
.doc = "TLS public key file base name",
2596
#else
2597
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2598
#endif
2599
.group = 1 },
1952
.group = 2 },
2600
1953
{ .name = "dh-bits", .key = 129,
2601
1954
.arg = "BITS",
2602
1955
.doc = "Bit length of the prime number used in the"
2603
1956
" Diffie-Hellman key exchange",
2604
1957
.group = 2 },
2605
{ .name = "dh-params", .key = 134,
2606
.arg = "FILE",
2607
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2608
" for the Diffie-Hellman key exchange",
2609
.group = 2 },
2610
1958
{ .name = "priority", .key = 130,
2611
1959
.arg = "STRING",
2612
1960
.doc = "GnuTLS priority string for the TLS handshake",
2658
2006
case 'p': /* --pubkey */
2659
2007
pubkey = arg;
2660
2008
break;
2661
case 't': /* --tls-privkey */
2662
#if GNUTLS_VERSION_NUMBER >= 0x030606
2663
tls_privkey = arg;
2664
#endif
2665
break;
2666
case 'T': /* --tls-pubkey */
2667
#if GNUTLS_VERSION_NUMBER >= 0x030606
2668
tls_pubkey = arg;
2669
#endif
2670
break;
2671
2009
case 129: /* --dh-bits */
2672
2010
errno = 0;
2673
2011
tmpmax = strtoimax(arg, &tmp, 10);
2677
2015
}
2678
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2679
2017
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2683
2018
case 130: /* --priority */
2684
2019
mc.priority = arg;
2685
2020
break;
2708
2043
argp_state_help(state, state->out_stream,
2709
2044
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2045
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2046
case -3: /* --usage */
2713
2047
argp_state_help(state, state->out_stream,
2714
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2049
case 'V': /* --version */
2717
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2051
exit(argp_err_exit_status);
2727
2060
.args_doc = "",
2728
2061
.doc = "Mandos client -- Get and decrypt"
2729
2062
" passwords from a Mandos server" };
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2733
2066
case 0:
2734
2067
break;
2735
2068
case ENOMEM:
2736
2069
default:
2737
errno = ret_errno;
2070
errno = ret;
2738
2071
perror_plus("argp_parse");
2739
2072
exitcode = EX_OSERR;
2740
2073
goto end;
2743
2076
goto end;
2744
2077
}
2745
2078
}
2746
2079
2747
2080
{
2081
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2083
2748
2084
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2752
2088
perror_plus("Failed to raise privileges");
2753
2089
} else {
2754
2090
struct stat st;
2755
2091
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2093
int seckey_fd = open(seckey, O_RDONLY);
2761
2094
if(seckey_fd == -1){
2773
2106
}
2774
2107
}
2775
2108
}
2776
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
2110
}
2778
2111
}
2779
2112
2780
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2782
2115
if(pubkey_fd == -1){
2794
2127
}
2795
2128
}
2796
2129
}
2797
close(pubkey_fd);
2798
}
2799
}
2800
2801
if(dh_params_file != NULL
2802
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2803
int dhparams_fd = open(dh_params_file, O_RDONLY);
2804
if(dhparams_fd == -1){
2805
perror_plus("open");
2806
} else {
2807
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2808
if(ret == -1){
2809
perror_plus("fstat");
2810
} else {
2811
if(S_ISREG(st.st_mode)
2812
and st.st_uid == 0 and st.st_gid == 0){
2813
ret = fchown(dhparams_fd, uid, gid);
2814
if(ret == -1){
2815
perror_plus("fchown");
2816
}
2817
}
2818
}
2819
close(dhparams_fd);
2820
}
2821
}
2822
2823
/* Work around Debian bug #981302
2824
<https://bugs.debian.org/981302> */
2825
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2826
ret = symlink("/proc/self/fd", "/dev/fd");
2827
if(ret == -1){
2828
perror_plus("Failed to create /dev/fd symlink");
2829
}
2830
}
2831
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2832
2134
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2836
2138
perror_plus("Failed to lower privileges");
2837
2139
}
2838
2140
}
2951
2253
2952
2254
/* If no interfaces were specified, make a list */
2953
2255
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2256
struct dirent **direntries;
2955
2257
/* Look for any good interfaces */
2956
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2957
2259
alphasort);
2963
2265
if(ret_errno != 0){
2964
2266
errno = ret_errno;
2965
2267
perror_plus("argz_add");
2966
free(direntries[i]);
2967
2268
continue;
2968
2269
}
2969
2270
if(debug){
2970
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
2272
direntries[i]->d_name);
2972
2273
}
2973
free(direntries[i]);
2974
2274
}
2975
2275
free(direntries);
2976
2276
} else {
2977
if(ret == 0){
2978
free(direntries);
2979
}
2277
free(direntries);
2980
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2981
2279
exitcode = EXIT_FAILURE;
2982
2280
goto end;
3008
2306
errno = bring_up_interface(interface, delay);
3009
2307
if(not interface_was_up){
3010
2308
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2309
perror_plus("Failed to bring up interface");
3013
2310
} else {
3014
2311
errno = argz_add(&interfaces_to_take_down,
3015
2312
&interfaces_to_take_down_size,
3038
2335
goto end;
3039
2336
}
3040
2337
3041
#if GNUTLS_VERSION_NUMBER >= 0x030606
3042
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3043
#elif GNUTLS_VERSION_NUMBER < 0x030600
3044
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3045
#else
3046
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3047
#endif
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
3048
2339
if(ret == -1){
3049
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2341
exitcode = EX_UNAVAILABLE;
3172
2463
3173
2464
/* Allocate a new server */
3174
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2466
&config, NULL, NULL, &ret_errno);
3176
2467
3177
2468
/* Free the Avahi configuration data */
3178
2469
avahi_server_config_free(&config);
3181
2472
/* Check if creating the Avahi server object succeeded */
3182
2473
if(mc.server == NULL){
3183
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2475
avahi_strerror(ret_errno));
3185
2476
exitcode = EX_UNAVAILABLE;
3186
2477
goto end;
3187
2478
}
3222
2513
end:
3223
2514
3224
2515
if(debug){
3225
if(signal_received){
3226
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3227
argv[0], signal_received,
3228
strsignal(signal_received));
3229
} else {
3230
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3231
}
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2517
}
3233
2518
3234
2519
/* Cleanup things */
3245
2530
3246
2531
if(gnutls_initialized){
3247
2532
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
3248
2534
gnutls_dh_params_deinit(mc.dh_params);
3249
2535
}
3250
2536
3258
2544
mc.current_server->prev->next = NULL;
3259
2545
while(mc.current_server != NULL){
3260
2546
server *next = mc.current_server->next;
3261
#ifdef __GNUC__
3262
#pragma GCC diagnostic push
3263
#pragma GCC diagnostic ignored "-Wcast-qual"
3264
#endif
3265
free((char *)(mc.current_server->ip));
3266
#ifdef __GNUC__
3267
#pragma GCC diagnostic pop
3268
#endif
3269
2547
free(mc.current_server);
3270
2548
mc.current_server = next;
3271
2549
}
3273
2551
3274
2552
/* Re-raise privileges */
3275
2553
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
3279
2556
perror_plus("Failed to raise privileges");
3280
2557
} else {
3281
2558
3286
2563
/* Take down the network interfaces which were brought up */
3287
2564
{
3288
2565
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3292
ret = take_down_interface(interface);
3293
if(ret != 0){
3294
errno = ret;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
3295
2572
perror_plus("Failed to take down interface");
3296
2573
}
3297
2574
}
3302
2579
}
3303
2580
}
3304
2581
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
3308
2584
perror_plus("Failed to lower privileges permanently");
3309
2585
}
3310
2586
}
3312
2588
free(interfaces_to_take_down);
3313
2589
free(interfaces_hooks);
3314
2590
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
3317
struct dirent **direntries = NULL;
3318
int dret;
3319
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3320
O_RDONLY
3321
| O_NOFOLLOW
3322
| O_DIRECTORY
3323
| O_PATH));
3324
if(dir_fd == -1){
3325
perror_plus("open");
3326
return;
3327
}
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3329
notdotentries, alphasort);
3330
if(numentries >= 0){
3331
for(int i = 0; i < numentries; i++){
3332
if(debug){
3333
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3334
dirname, direntries[i]->d_name);
3335
}
3336
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3337
if(dret == -1){
3338
if(errno == EISDIR){
3339
dret = unlinkat(dir_fd, direntries[i]->d_name,
3340
AT_REMOVEDIR);
3341
}
3342
if((dret == -1) and (errno == ENOTEMPTY)
3343
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3344
== 0) and (level == 0)){
3345
/* Recurse only in this special case */
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3347
dret = 0;
3348
}
3349
if((dret == -1) and (errno != ENOENT)){
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
direntries[i]->d_name, strerror(errno));
3352
}
3353
}
3354
free(direntries[i]);
3355
}
3356
3357
/* need to clean even if 0 because man page doesn't specify */
3358
free(direntries);
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
if(dret == -1 and errno != ENOENT){
3361
perror_plus("rmdir");
3362
}
3363
} else {
3364
perror_plus("scandirat");
3365
}
3366
close(dir_fd);
3367
}
3368
3369
2591
/* Removes the GPGME temp directory and all files inside */
3370
2592
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2630
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2632
}
3372
2633
}
3373
2634
3374
2635
if(quit_now){
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