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- Committer: Teddy Hogeborn
- Date: 2014-06-07 22:37:22 UTC
- Revision ID: teddy@recompile.se-20140607223722-55qmdr3n9x39pvx4
Make mandos-client use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
- 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(), remove() */
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() */
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
#include <arpa/inet.h> /* inet_pton(), htons() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
111
90
#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 */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
132
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
96
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
97
139
98
#ifdef __linux__
140
99
#include <sys/klog.h> /* klogctl() */
153
112
154
113
/* GnuTLS */
155
114
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
115
functions:
116
gnutls_*
117
init_gnutls_session(),
118
GNUTLS_* */
158
119
#include <gnutls/openpgp.h>
159
120
/* gnutls_certificate_set_openpgp_key_file(),
160
121
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
122
166
123
/* GPGME */
167
124
#include <gpgme.h> /* All GPGME types, constants and
168
125
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
126
gpgme_*
127
GPGME_PROTOCOL_OpenPGP,
128
GPG_ERR_NO_* */
172
129
173
130
#define BUFFER_SIZE 256
174
131
175
132
#define PATHDIR "/conf/conf.d/mandos"
176
133
#define SECKEY "seckey.txt"
177
134
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
136
182
137
bool debug = false;
278
233
.af = af };
279
234
if(new_server->ip == NULL){
280
235
perror_plus("strdup");
281
free(new_server);
282
236
return false;
283
237
}
284
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
285
239
if(ret == -1){
286
240
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
241
return false;
297
242
}
298
243
/* Special case of first server */
310
255
return true;
311
256
}
312
257
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
258
/*
366
259
* Initialize GPGME.
367
260
*/
387
280
return false;
388
281
}
389
282
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
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
284
if(rc != GPG_ERR_NO_ERROR){
441
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
293
gpgme_strsource(rc), gpgme_strerror(rc));
450
294
return false;
451
295
}
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
296
528
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
298
if(ret == -1){
530
299
perror_plus("close");
531
300
}
570
339
/* Create new GPGME "context" */
571
340
rc = gpgme_new(&(mc->ctx));
572
341
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
575
345
return false;
576
346
}
577
347
613
383
/* Create new empty GPGME data buffer for the plaintext */
614
384
rc = gpgme_data_new(&dh_plain);
615
385
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
617
388
gpgme_strsource(rc), gpgme_strerror(rc));
618
389
gpgme_data_release(dh_crypto);
619
390
return -1;
632
403
if(result == NULL){
633
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
405
} 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");
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
641
410
if(result->file_name != NULL){
642
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
412
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
413
gpgme_recipient_t recipient;
414
recipient = result->recipients;
415
while(recipient != NULL){
647
416
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);
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
420
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
652
424
}
653
425
}
654
426
}
710
482
return plaintext_length;
711
483
}
712
484
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
485
__attribute__((warn_unused_result))
721
486
static const char *safer_gnutls_strerror(int value){
722
487
const char *ret = gnutls_strerror(value);
723
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
724
491
}
725
492
726
493
/* GnuTLS log function callback */
730
497
fprintf_plus(stderr, "GnuTLS: %s", string);
731
498
}
732
499
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
734
501
static int init_gnutls_global(const char *pubkeyfilename,
735
502
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
503
mandos_context *mc){
738
504
int ret;
739
505
741
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
508
}
743
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
744
517
if(debug){
745
518
/* "Use a log level over 10 to enable all debugging options."
746
519
* - GnuTLS manual
754
527
if(ret != GNUTLS_E_SUCCESS){
755
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
757
531
return -1;
758
532
}
759
533
760
534
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
763
537
pubkeyfilename,
764
538
seckeyfilename);
765
539
}
766
540
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
541
ret = gnutls_certificate_set_openpgp_key_file
781
542
(mc->cred, pubkeyfilename, seckeyfilename,
782
543
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
544
if(ret != GNUTLS_E_SUCCESS){
787
545
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
549
safer_gnutls_strerror(ret));
800
558
safer_gnutls_strerror(ret));
801
559
goto globalfail;
802
560
}
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
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
569
986
570
return 0;
987
571
988
572
globalfail:
989
573
990
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
991
576
gnutls_dh_params_deinit(mc->dh_params);
992
577
return -1;
993
578
}
998
583
int ret;
999
584
/* GnuTLS session creation */
1000
585
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
));
586
ret = gnutls_init(session, GNUTLS_SERVER);
1009
587
if(quit_now){
1010
588
return -1;
1011
589
}
1052
630
/* ignore client certificate if any. */
1053
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1054
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
1055
635
return 0;
1056
636
}
1057
637
1059
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
640
__attribute__((unused)) const char *txt){}
1061
641
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
642
/* Called when a Mandos server is found */
1236
643
__attribute__((nonnull, warn_unused_result))
1237
644
static int start_mandos_communication(const char *ip, in_port_t port,
1248
655
int retval = -1;
1249
656
gnutls_session_t session;
1250
657
int pf; /* Protocol family */
1251
bool route_added = false;
1252
658
1253
659
errno = 0;
1254
660
1276
682
bool match = false;
1277
683
{
1278
684
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1282
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
688
match = true;
1284
689
break;
1313
718
PRIuMAX "\n", ip, (uintmax_t)port);
1314
719
}
1315
720
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1317
722
if(tcp_sd < 0){
1318
723
int e = errno;
1319
724
perror_plus("socket");
1326
731
goto mandos_end;
1327
732
}
1328
733
734
memset(&to, 0, sizeof(to));
1329
735
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);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1333
738
} 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);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1337
741
}
1338
742
if(ret < 0 ){
1339
743
int e = errno;
1409
813
goto mandos_end;
1410
814
}
1411
815
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;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1467
835
}
1468
836
1469
837
const char *out = mandos_protocol_version;
1623
991
&decrypted_buffer, mc);
1624
992
if(decrypted_buffer_size >= 0){
1625
993
1626
clearerr(stdout);
1627
994
written = 0;
1628
995
while(written < (size_t) decrypted_buffer_size){
1629
996
if(quit_now){
1645
1012
}
1646
1013
written += (size_t)ret;
1647
1014
}
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
1015
retval = 0;
1659
1016
}
1660
1017
}
1663
1020
1664
1021
mandos_end:
1665
1022
{
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
1023
int e = errno;
1673
1024
free(decrypted_buffer);
1674
1025
free(buffer);
1675
1026
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
1028
}
1678
1029
if(ret == -1){
1679
1030
if(e == 0){
1691
1042
return retval;
1692
1043
}
1693
1044
1045
__attribute__((nonnull))
1694
1046
static void resolve_callback(AvahiSServiceResolver *r,
1695
1047
AvahiIfIndex interface,
1696
1048
AvahiProtocol proto,
1713
1065
timed out */
1714
1066
1715
1067
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1717
1068
return;
1718
1069
}
1719
1070
1833
1184
__attribute__((nonnull, warn_unused_result))
1834
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1186
int ret;
1836
int old_errno;
1187
error_t ret_errno;
1837
1188
1838
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1190
if(s < 0){
1840
old_errno = errno;
1191
ret_errno = errno;
1841
1192
perror_plus("socket");
1842
errno = old_errno;
1193
errno = ret_errno;
1843
1194
return false;
1844
1195
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1847
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1198
if(ret == -1){
1849
1199
if(debug){
1850
old_errno = errno;
1200
ret_errno = errno;
1851
1201
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;
1202
errno = ret_errno;
1858
1203
}
1859
1204
return false;
1860
1205
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1206
return true;
1867
1207
}
1868
1208
2110
1450
}
2111
1451
}
2112
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
2113
1528
__attribute__((nonnull))
2114
1529
void run_network_hooks(const char *mode, const char *interface,
2115
1530
const float delay){
2116
struct dirent **direntries = NULL;
1531
struct dirent **direntries;
2117
1532
if(hookdir_fd == -1){
2118
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2119
| O_CLOEXEC);
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
2120
1540
if(hookdir_fd == -1){
2121
1541
if(errno == ENOENT){
2122
1542
if(debug){
2128
1548
}
2129
1549
return;
2130
1550
}
2131
}
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
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
2137
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
2139
1575
if(numhooks == -1){
2140
1576
perror_plus("scandir");
2141
close(devnull);
2142
1577
return;
2143
1578
}
2144
1579
struct dirent *direntry;
2145
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
2146
1582
for(int i = 0; i < numhooks; i++){
2147
1583
direntry = direntries[i];
2148
1584
if(debug){
2153
1589
if(hook_pid == 0){
2154
1590
/* Child */
2155
1591
/* Raise privileges */
2156
errno = raise_privileges_permanently();
2157
if(errno != 0){
1592
if(raise_privileges_permanently() != 0){
2158
1593
perror_plus("Failed to raise privileges");
2159
1594
_exit(EX_NOPERM);
2160
1595
}
2172
1607
perror_plus("setgroups");
2173
1608
_exit(EX_NOPERM);
2174
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
2175
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2176
1626
if(ret == -1){
2177
1627
perror_plus("setenv");
2212
1662
_exit(EX_OSERR);
2213
1663
}
2214
1664
}
2215
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2216
direntry->d_name,
2217
O_RDONLY));
2218
if(hook_fd == -1){
2219
perror_plus("openat");
2220
_exit(EXIT_FAILURE);
2221
}
2222
if(close(hookdir_fd) == -1){
2223
perror_plus("close");
2224
_exit(EXIT_FAILURE);
2225
}
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
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2242
environ) == -1){
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
2243
1667
perror_plus("fexecve");
2244
1668
_exit(EXIT_FAILURE);
2245
1669
}
2246
1670
} else {
2247
if(hook_pid == -1){
2248
perror_plus("fork");
2249
free(direntry);
2250
continue;
2251
}
2252
1671
int status;
2253
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2254
1673
perror_plus("waitpid");
2255
free(direntry);
2256
1674
continue;
2257
1675
}
2258
1676
if(WIFEXITED(status)){
2260
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2261
1679
" with status %d\n", direntry->d_name,
2262
1680
WEXITSTATUS(status));
2263
free(direntry);
2264
1681
continue;
2265
1682
}
2266
1683
} else if(WIFSIGNALED(status)){
2267
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2268
1685
" signal %d\n", direntry->d_name,
2269
1686
WTERMSIG(status));
2270
free(direntry);
2271
1687
continue;
2272
1688
} else {
2273
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
1690
" crashed\n", direntry->d_name);
2275
free(direntry);
2276
1691
continue;
2277
1692
}
2278
1693
}
2280
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2281
1696
direntry->d_name);
2282
1697
}
2283
free(direntry);
2284
1698
}
2285
free(direntries);
2286
if(close(hookdir_fd) == -1){
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2287
1700
perror_plus("close");
2288
1701
} else {
2289
1702
hookdir_fd = -1;
2292
1705
}
2293
1706
2294
1707
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
2298
1711
int ret;
2299
1712
struct ifreq network;
2300
1713
unsigned int if_index = if_nametoindex(interface);
2310
1723
}
2311
1724
2312
1725
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1726
error_t ret_errno = 0, ioctl_errno = 0;
2315
1727
if(not get_flags(interface, &network)){
2316
1728
ret_errno = errno;
2317
1729
fprintf_plus(stderr, "Failed to get flags for interface "
2330
1742
}
2331
1743
2332
1744
if(quit_now){
2333
ret = close(sd);
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2334
1746
if(ret == -1){
2335
1747
perror_plus("close");
2336
1748
}
2346
1758
/* Raise privileges */
2347
1759
ret_errno = raise_privileges();
2348
1760
if(ret_errno != 0){
2349
errno = ret_errno;
2350
1761
perror_plus("Failed to raise privileges");
2351
1762
}
2352
1763
2386
1797
}
2387
1798
2388
1799
/* Close the socket */
2389
ret = close(sd);
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
1801
if(ret == -1){
2391
1802
perror_plus("close");
2392
1803
}
2404
1815
2405
1816
/* Sleep checking until interface is running.
2406
1817
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
1818
for(int i=0; i < delay * 4; i++){
2408
1819
if(interface_is_running(interface)){
2409
1820
break;
2410
1821
}
2420
1831
}
2421
1832
2422
1833
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
2425
1836
struct ifreq network;
2426
1837
unsigned int if_index = if_nametoindex(interface);
2427
1838
if(if_index == 0){
2430
1841
return ENXIO;
2431
1842
}
2432
1843
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
1844
error_t ret_errno = 0, ioctl_errno = 0;
2435
1845
if(not get_flags(interface, &network) and debug){
2436
1846
ret_errno = errno;
2437
1847
fprintf_plus(stderr, "Failed to get flags for interface "
2457
1867
/* Raise privileges */
2458
1868
ret_errno = raise_privileges();
2459
1869
if(ret_errno != 0){
2460
errno = ret_errno;
2461
1870
perror_plus("Failed to raise privileges");
2462
1871
}
2463
1872
2475
1884
}
2476
1885
2477
1886
/* Close the socket */
2478
int ret = close(sd);
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
1888
if(ret == -1){
2480
1889
perror_plus("close");
2481
1890
}
2496
1905
}
2497
1906
2498
1907
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 };
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
2512
1912
AvahiSServiceBrowser *sb = NULL;
2513
1913
error_t ret_errno;
2514
1914
int ret;
2523
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
1924
const char *seckey = PATHDIR "/" SECKEY;
2525
1925
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
1926
char *interfaces_hooks = NULL;
2532
1927
2533
1928
bool gnutls_initialized = false;
2580
1975
{ .name = "pubkey", .key = 'p',
2581
1976
.arg = "FILE",
2582
1977
.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 },
1978
.group = 2 },
2600
1979
{ .name = "dh-bits", .key = 129,
2601
1980
.arg = "BITS",
2602
1981
.doc = "Bit length of the prime number used in the"
2603
1982
" Diffie-Hellman key exchange",
2604
1983
.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
1984
{ .name = "priority", .key = 130,
2611
1985
.arg = "STRING",
2612
1986
.doc = "GnuTLS priority string for the TLS handshake",
2658
2032
case 'p': /* --pubkey */
2659
2033
pubkey = arg;
2660
2034
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
2035
case 129: /* --dh-bits */
2672
2036
errno = 0;
2673
2037
tmpmax = strtoimax(arg, &tmp, 10);
2677
2041
}
2678
2042
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2679
2043
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2683
2044
case 130: /* --priority */
2684
2045
mc.priority = arg;
2685
2046
break;
2708
2069
argp_state_help(state, state->out_stream,
2709
2070
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2071
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2072
case -3: /* --usage */
2713
2073
argp_state_help(state, state->out_stream,
2714
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2075
case 'V': /* --version */
2717
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2077
exit(argp_err_exit_status);
2727
2086
.args_doc = "",
2728
2087
.doc = "Mandos client -- Get and decrypt"
2729
2088
" 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){
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2091
switch(ret){
2733
2092
case 0:
2734
2093
break;
2735
2094
case ENOMEM:
2736
2095
default:
2737
errno = ret_errno;
2096
errno = ret;
2738
2097
perror_plus("argp_parse");
2739
2098
exitcode = EX_OSERR;
2740
2099
goto end;
2743
2102
goto end;
2744
2103
}
2745
2104
}
2746
2105
2747
2106
{
2107
/* Work around Debian bug #633582:
2108
<http://bugs.debian.org/633582> */
2109
2748
2110
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2752
2114
perror_plus("Failed to raise privileges");
2753
2115
} else {
2754
2116
struct stat st;
2755
2117
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2119
int seckey_fd = open(seckey, O_RDONLY);
2761
2120
if(seckey_fd == -1){
2773
2132
}
2774
2133
}
2775
2134
}
2776
close(seckey_fd);
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
2136
}
2778
2137
}
2779
2138
2780
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2782
2141
if(pubkey_fd == -1){
2794
2153
}
2795
2154
}
2796
2155
}
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
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2832
2160
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2836
2164
perror_plus("Failed to lower privileges");
2837
2165
}
2838
2166
}
2951
2279
2952
2280
/* If no interfaces were specified, make a list */
2953
2281
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2282
struct dirent **direntries;
2955
2283
/* Look for any good interfaces */
2956
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2957
2285
alphasort);
2963
2291
if(ret_errno != 0){
2964
2292
errno = ret_errno;
2965
2293
perror_plus("argz_add");
2966
free(direntries[i]);
2967
2294
continue;
2968
2295
}
2969
2296
if(debug){
2970
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
2298
direntries[i]->d_name);
2972
2299
}
2973
free(direntries[i]);
2974
2300
}
2975
2301
free(direntries);
2976
2302
} else {
2977
if(ret == 0){
2978
free(direntries);
2979
}
2303
free(direntries);
2980
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2981
2305
exitcode = EXIT_FAILURE;
2982
2306
goto end;
3008
2332
errno = bring_up_interface(interface, delay);
3009
2333
if(not interface_was_up){
3010
2334
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2335
perror_plus("Failed to bring up interface");
3013
2336
} else {
3014
2337
errno = argz_add(&interfaces_to_take_down,
3015
2338
&interfaces_to_take_down_size,
3038
2361
goto end;
3039
2362
}
3040
2363
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
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
3048
2365
if(ret == -1){
3049
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2367
exitcode = EX_UNAVAILABLE;
3172
2489
3173
2490
/* Allocate a new server */
3174
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2492
&config, NULL, NULL, &ret_errno);
3176
2493
3177
2494
/* Free the Avahi configuration data */
3178
2495
avahi_server_config_free(&config);
3181
2498
/* Check if creating the Avahi server object succeeded */
3182
2499
if(mc.server == NULL){
3183
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2501
avahi_strerror(ret_errno));
3185
2502
exitcode = EX_UNAVAILABLE;
3186
2503
goto end;
3187
2504
}
3222
2539
end:
3223
2540
3224
2541
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
}
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2543
}
3233
2544
3234
2545
/* Cleanup things */
3245
2556
3246
2557
if(gnutls_initialized){
3247
2558
gnutls_certificate_free_credentials(mc.cred);
2559
gnutls_global_deinit();
3248
2560
gnutls_dh_params_deinit(mc.dh_params);
3249
2561
}
3250
2562
3258
2570
mc.current_server->prev->next = NULL;
3259
2571
while(mc.current_server != NULL){
3260
2572
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
2573
free(mc.current_server);
3270
2574
mc.current_server = next;
3271
2575
}
3273
2577
3274
2578
/* Re-raise privileges */
3275
2579
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
3279
2582
perror_plus("Failed to raise privileges");
3280
2583
} else {
3281
2584
3286
2589
/* Take down the network interfaces which were brought up */
3287
2590
{
3288
2591
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;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
3295
2598
perror_plus("Failed to take down interface");
3296
2599
}
3297
2600
}
3302
2605
}
3303
2606
}
3304
2607
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
3308
2610
perror_plus("Failed to lower privileges permanently");
3309
2611
}
3310
2612
}
3312
2614
free(interfaces_to_take_down);
3313
2615
free(interfaces_hooks);
3314
2616
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
2617
/* Removes the GPGME temp directory and all files inside */
3370
2618
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
2626
char *fullname = NULL;
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
2628
direntry->d_name);
2629
if(ret < 0){
2630
perror_plus("asprintf");
2631
continue;
2632
}
2633
ret = remove(fullname);
2634
if(ret == -1){
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2637
}
2638
free(fullname);
2639
}
2640
}
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2643
free(direntries);
2644
if(numentries == -1){
2645
perror_plus("scandir");
2646
}
2647
ret = rmdir(tempdir);
2648
if(ret == -1 and errno != ENOENT){
2649
perror_plus("rmdir");
2650
}
3372
2651
}
3373
2652
3374
2653
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0