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» Revision
237.7.829
(compared to revision 237.25.5)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2024-09-08 00:34:00 UTC
- mto: This revision was merged to the branch mainline in revision 410.
- Revision ID: teddy@recompile.se-20240908003400-y5h2izw1s1469lzn
Fix Y2038
* Makefile (CPPFLAGS): Add "-D_TIME_BITS=64".
* Makefile (CPPFLAGS): Add "-D_TIME_BITS=64".
- files added:
- bugs.xml
- debian/tests
- dracut-module
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2022 Teddy Hogeborn
13
* Copyright © 2008-2022 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
37
38
#define _FILE_OFFSET_BITS 64
38
39
#endif /* not _FILE_OFFSET_BITS */
39
40
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() */
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
48
44
#include <stdbool.h> /* bool, false, true */
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,
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 */
111
#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,
64
129
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() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
96
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
133
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 */
98
138
99
139
#ifdef __linux__
100
140
#include <sys/klog.h> /* klogctl() */
113
153
114
154
/* GnuTLS */
115
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
116
functions:
117
gnutls_*
118
init_gnutls_session(),
119
GNUTLS_* */
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
120
158
#include <gnutls/openpgp.h>
121
159
/* gnutls_certificate_set_openpgp_key_file(),
122
160
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
123
165
124
166
/* GPGME */
125
167
#include <gpgme.h> /* All GPGME types, constants and
126
168
functions:
127
gpgme_*
128
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_* */
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
130
172
131
173
#define BUFFER_SIZE 256
132
174
133
175
#define PATHDIR "/conf/conf.d/mandos"
134
176
#define SECKEY "seckey.txt"
135
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
136
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
181
138
182
bool debug = false;
266
310
return true;
267
311
}
268
312
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
269
365
/*
270
366
* Initialize GPGME.
271
367
*/
291
387
return false;
292
388
}
293
389
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
294
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
440
if(rc != GPG_ERR_NO_ERROR){
296
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
304
449
gpgme_strsource(rc), gpgme_strerror(rc));
305
450
return false;
306
451
}
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
}
307
527
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
528
ret = close(fd);
309
529
if(ret == -1){
310
530
perror_plus("close");
311
531
}
350
570
/* Create new GPGME "context" */
351
571
rc = gpgme_new(&(mc->ctx));
352
572
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
356
575
return false;
357
576
}
358
577
394
613
/* Create new empty GPGME data buffer for the plaintext */
395
614
rc = gpgme_data_new(&dh_plain);
396
615
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
399
617
gpgme_strsource(rc), gpgme_strerror(rc));
400
618
gpgme_data_release(dh_crypto);
401
619
return -1;
414
632
if(result == NULL){
415
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
634
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
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");
421
641
if(result->file_name != NULL){
422
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
423
643
}
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
427
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
431
650
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
435
652
}
436
653
}
437
654
}
493
710
return plaintext_length;
494
711
}
495
712
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
496
720
__attribute__((warn_unused_result))
497
721
static const char *safer_gnutls_strerror(int value){
498
722
const char *ret = gnutls_strerror(value);
499
if(ret == NULL)
500
ret = "(unknown)";
501
return ret;
723
return safe_string(ret);
502
724
}
503
725
504
726
/* GnuTLS log function callback */
508
730
fprintf_plus(stderr, "GnuTLS: %s", string);
509
731
}
510
732
511
__attribute__((nonnull, warn_unused_result))
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
512
734
static int init_gnutls_global(const char *pubkeyfilename,
513
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
514
737
mandos_context *mc){
515
738
int ret;
516
739
518
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
519
742
}
520
743
521
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
525
return -1;
526
}
527
528
744
if(debug){
529
745
/* "Use a log level over 10 to enable all debugging options."
530
746
* - GnuTLS manual
538
754
if(ret != GNUTLS_E_SUCCESS){
539
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
756
safer_gnutls_strerror(ret));
541
gnutls_global_deinit();
542
757
return -1;
543
758
}
544
759
545
760
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
548
763
pubkeyfilename,
549
764
seckeyfilename);
550
765
}
551
766
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
552
780
ret = gnutls_certificate_set_openpgp_key_file
553
781
(mc->cred, pubkeyfilename, seckeyfilename,
554
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
555
786
if(ret != GNUTLS_E_SUCCESS){
556
787
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
788
"Error[%d] while reading the key pair ('%s',"
558
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
791
safer_gnutls_strerror(ret));
569
800
safer_gnutls_strerror(ret));
570
801
goto globalfail;
571
802
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
576
goto globalfail;
577
}
578
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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
}
580
985
581
986
return 0;
582
987
583
988
globalfail:
584
989
585
990
gnutls_certificate_free_credentials(mc->cred);
586
gnutls_global_deinit();
587
991
gnutls_dh_params_deinit(mc->dh_params);
588
992
return -1;
589
993
}
594
998
int ret;
595
999
/* GnuTLS session creation */
596
1000
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
598
1009
if(quit_now){
599
1010
return -1;
600
1011
}
641
1052
/* ignore client certificate if any. */
642
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
1054
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
646
1055
return 0;
647
1056
}
648
1057
650
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
1060
__attribute__((unused)) const char *txt){}
652
1061
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
1062
/* Helper function to add_local_route() and delete_local_route() */
706
1063
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
1064
static bool add_delete_local_route(const bool add,
708
1065
const char *address,
709
1066
AvahiIfIndex if_index){
710
1067
int ret;
711
1068
char helper[] = "mandos-client-iprouteadddel";
712
1069
char add_arg[] = "add";
713
1070
char delete_arg[] = "delete";
1071
char debug_flag[] = "--debug";
714
1072
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
1073
if(pluginhelperdir == NULL){
716
1074
if(debug){
745
1103
ret = setgid(0);
746
1104
if(ret == -1){
747
1105
perror_plus("setgid");
1106
close(devnull);
748
1107
_exit(EX_NOPERM);
749
1108
}
750
1109
/* Reset supplementary groups */
752
1111
ret = setgroups(0, NULL);
753
1112
if(ret == -1){
754
1113
perror_plus("setgroups");
1114
close(devnull);
755
1115
_exit(EX_NOPERM);
756
1116
}
757
1117
}
758
1118
ret = dup2(devnull, STDIN_FILENO);
759
1119
if(ret == -1){
760
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
761
1122
_exit(EX_OSERR);
762
1123
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1124
ret = close(devnull);
764
1125
if(ret == -1){
765
1126
perror_plus("close");
766
_exit(EX_OSERR);
767
1127
}
768
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
1129
if(ret == -1){
783
1143
helper, O_RDONLY));
784
1144
if(helper_fd == -1){
785
1145
perror_plus("openat");
1146
close(helperdir_fd);
786
1147
_exit(EX_UNAVAILABLE);
787
1148
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
1149
close(helperdir_fd);
789
1150
#ifdef __GNUC__
790
1151
#pragma GCC diagnostic push
791
1152
#pragma GCC diagnostic ignored "-Wcast-qual"
792
1153
#endif
793
1154
if(fexecve(helper_fd, (char *const [])
794
1155
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
1156
interface, debug ? debug_flag : NULL, NULL },
1157
environ) == -1){
796
1158
#ifdef __GNUC__
797
1159
#pragma GCC diagnostic pop
798
1160
#endif
802
1164
}
803
1165
if(pid == -1){
804
1166
perror_plus("fork");
1167
close(devnull);
805
1168
return false;
806
1169
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
807
1174
int status;
808
1175
pid_t pret = -1;
809
1176
errno = 0;
850
1217
__attribute__((nonnull, warn_unused_result))
851
1218
static bool add_local_route(const char *address,
852
1219
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, 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);
854
1224
}
855
1225
856
1226
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
1227
static bool delete_local_route(const char *address,
858
1228
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, 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);
860
1233
}
861
1234
862
1235
/* Called when a Mandos server is found */
903
1276
bool match = false;
904
1277
{
905
1278
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
908
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
909
1283
match = true;
910
1284
break;
952
1326
goto mandos_end;
953
1327
}
954
1328
955
memset(&to, 0, sizeof(to));
956
1329
if(af == AF_INET6){
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
959
1333
} else { /* IPv4 */
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
962
1337
}
963
1338
if(ret < 0 ){
964
1339
int e = errno;
1043
1418
sizeof(struct sockaddr_in));
1044
1419
}
1045
1420
if(ret < 0){
1046
if(errno == ENETUNREACH
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1047
1422
and if_index != AVAHI_IF_UNSPEC
1048
1423
and connect_to == NULL
1049
1424
and not route_added and
1062
1437
with an explicit route added with the server's address.
1063
1438
1064
1439
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
1441
https://bugs.debian.org/587961
1067
1442
*/
1443
if(debug){
1444
fprintf_plus(stderr, "Mandos server unreachable, trying"
1445
" direct route\n");
1446
}
1068
1447
int e = errno;
1069
1448
route_added = add_local_route(ip, if_index);
1070
1449
if(route_added){
1244
1623
&decrypted_buffer, mc);
1245
1624
if(decrypted_buffer_size >= 0){
1246
1625
1626
clearerr(stdout);
1247
1627
written = 0;
1248
1628
while(written < (size_t) decrypted_buffer_size){
1249
1629
if(quit_now){
1265
1645
}
1266
1646
written += (size_t)ret;
1267
1647
}
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
}
1268
1658
retval = 0;
1269
1659
}
1270
1660
}
1274
1664
mandos_end:
1275
1665
{
1276
1666
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1667
if(not delete_local_route(ip, if_index)){
1668
fprintf_plus(stderr, "Failed to delete local route to %s on"
1279
1669
" interface %d", ip, if_index);
1280
1670
}
1281
1671
}
1283
1673
free(decrypted_buffer);
1284
1674
free(buffer);
1285
1675
if(tcp_sd >= 0){
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1676
ret = close(tcp_sd);
1287
1677
}
1288
1678
if(ret == -1){
1289
1679
if(e == 0){
1301
1691
return retval;
1302
1692
}
1303
1693
1304
__attribute__((nonnull))
1305
1694
static void resolve_callback(AvahiSServiceResolver *r,
1306
1695
AvahiIfIndex interface,
1307
1696
AvahiProtocol proto,
1444
1833
__attribute__((nonnull, warn_unused_result))
1445
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
1835
int ret;
1447
error_t ret_errno;
1836
int old_errno;
1448
1837
1449
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1450
1839
if(s < 0){
1451
ret_errno = errno;
1840
old_errno = errno;
1452
1841
perror_plus("socket");
1453
errno = ret_errno;
1842
errno = old_errno;
1454
1843
return false;
1455
1844
}
1456
strcpy(ifr->ifr_name, ifname);
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1457
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1458
1848
if(ret == -1){
1459
1849
if(debug){
1460
ret_errno = errno;
1850
old_errno = errno;
1461
1851
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1463
1858
}
1464
1859
return false;
1465
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1466
1866
return true;
1467
1867
}
1468
1868
1729
2129
return;
1730
2130
}
1731
2131
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
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
}
1734
2137
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
2138
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
2139
if(numhooks == -1){
1745
2140
perror_plus("scandir");
2141
close(devnull);
1746
2142
return;
1747
2143
}
1748
2144
struct dirent *direntry;
1749
2145
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
2146
for(int i = 0; i < numhooks; i++){
1756
2147
direntry = direntries[i];
1757
2148
if(debug){
1828
2219
perror_plus("openat");
1829
2220
_exit(EXIT_FAILURE);
1830
2221
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2222
if(close(hookdir_fd) == -1){
1832
2223
perror_plus("close");
1833
2224
_exit(EXIT_FAILURE);
1834
2225
}
1837
2228
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
2229
_exit(EX_OSERR);
1839
2230
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2231
ret = close(devnull);
1841
2232
if(ret == -1){
1842
2233
perror_plus("close");
1843
2234
_exit(EX_OSERR);
1892
2283
free(direntry);
1893
2284
}
1894
2285
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2286
if(close(hookdir_fd) == -1){
1896
2287
perror_plus("close");
1897
2288
} else {
1898
2289
hookdir_fd = -1;
1901
2292
}
1902
2293
1903
2294
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
1907
2298
int ret;
1908
2299
struct ifreq network;
1909
2300
unsigned int if_index = if_nametoindex(interface);
1919
2310
}
1920
2311
1921
2312
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1923
2315
if(not get_flags(interface, &network)){
1924
2316
ret_errno = errno;
1925
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1938
2330
}
1939
2331
1940
2332
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2333
ret = close(sd);
1942
2334
if(ret == -1){
1943
2335
perror_plus("close");
1944
2336
}
1994
2386
}
1995
2387
1996
2388
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2389
ret = close(sd);
1998
2390
if(ret == -1){
1999
2391
perror_plus("close");
2000
2392
}
2012
2404
2013
2405
/* Sleep checking until interface is running.
2014
2406
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2407
for(int i = 0; i < delay * 4; i++){
2016
2408
if(interface_is_running(interface)){
2017
2409
break;
2018
2410
}
2028
2420
}
2029
2421
2030
2422
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
2033
2425
struct ifreq network;
2034
2426
unsigned int if_index = if_nametoindex(interface);
2035
2427
if(if_index == 0){
2038
2430
return ENXIO;
2039
2431
}
2040
2432
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2042
2435
if(not get_flags(interface, &network) and debug){
2043
2436
ret_errno = errno;
2044
2437
fprintf_plus(stderr, "Failed to get flags for interface "
2082
2475
}
2083
2476
2084
2477
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2478
int ret = close(sd);
2086
2479
if(ret == -1){
2087
2480
perror_plus("close");
2088
2481
}
2103
2496
}
2104
2497
2105
2498
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
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 };
2110
2512
AvahiSServiceBrowser *sb = NULL;
2111
2513
error_t ret_errno;
2112
2514
int ret;
2121
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2122
2524
const char *seckey = PATHDIR "/" SECKEY;
2123
2525
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;
2124
2531
char *interfaces_hooks = NULL;
2125
2532
2126
2533
bool gnutls_initialized = false;
2173
2580
{ .name = "pubkey", .key = 'p',
2174
2581
.arg = "FILE",
2175
2582
.doc = "OpenPGP public key file base name",
2176
.group = 2 },
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 },
2177
2600
{ .name = "dh-bits", .key = 129,
2178
2601
.arg = "BITS",
2179
2602
.doc = "Bit length of the prime number used in the"
2180
2603
" Diffie-Hellman key exchange",
2181
2604
.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 },
2182
2610
{ .name = "priority", .key = 130,
2183
2611
.arg = "STRING",
2184
2612
.doc = "GnuTLS priority string for the TLS handshake",
2230
2658
case 'p': /* --pubkey */
2231
2659
pubkey = arg;
2232
2660
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;
2233
2671
case 129: /* --dh-bits */
2234
2672
errno = 0;
2235
2673
tmpmax = strtoimax(arg, &tmp, 10);
2239
2677
}
2240
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2241
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2242
2683
case 130: /* --priority */
2243
2684
mc.priority = arg;
2244
2685
break;
2267
2708
argp_state_help(state, state->out_stream,
2268
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2269
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2270
2712
case -3: /* --usage */
2271
2713
argp_state_help(state, state->out_stream,
2272
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2273
2716
case 'V': /* --version */
2274
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2275
2718
exit(argp_err_exit_status);
2284
2727
.args_doc = "",
2285
2728
.doc = "Mandos client -- Get and decrypt"
2286
2729
" passwords from a Mandos server" };
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
2290
2733
case 0:
2291
2734
break;
2292
2735
case ENOMEM:
2293
2736
default:
2294
errno = ret;
2737
errno = ret_errno;
2295
2738
perror_plus("argp_parse");
2296
2739
exitcode = EX_OSERR;
2297
2740
goto end;
2302
2745
}
2303
2746
2304
2747
{
2305
/* Work around Debian bug #633582:
2306
<http://bugs.debian.org/633582> */
2307
2308
2748
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2312
2752
perror_plus("Failed to raise privileges");
2313
2753
} else {
2314
2754
struct stat st;
2315
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2316
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
2760
int seckey_fd = open(seckey, O_RDONLY);
2318
2761
if(seckey_fd == -1){
2330
2773
}
2331
2774
}
2332
2775
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2776
close(seckey_fd);
2334
2777
}
2335
2778
}
2336
2779
2351
2794
}
2352
2795
}
2353
2796
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
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
2358
2832
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2362
2836
perror_plus("Failed to lower privileges");
2363
2837
}
2364
2838
}
2534
3008
errno = bring_up_interface(interface, delay);
2535
3009
if(not interface_was_up){
2536
3010
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2538
3013
} else {
2539
3014
errno = argz_add(&interfaces_to_take_down,
2540
3015
&interfaces_to_take_down_size,
2563
3038
goto end;
2564
3039
}
2565
3040
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
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
2567
3048
if(ret == -1){
2568
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2569
3050
exitcode = EX_UNAVAILABLE;
2691
3172
2692
3173
/* Allocate a new server */
2693
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
3175
&config, NULL, NULL, &ret);
2695
3176
2696
3177
/* Free the Avahi configuration data */
2697
3178
avahi_server_config_free(&config);
2700
3181
/* Check if creating the Avahi server object succeeded */
2701
3182
if(mc.server == NULL){
2702
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
3184
avahi_strerror(ret));
2704
3185
exitcode = EX_UNAVAILABLE;
2705
3186
goto end;
2706
3187
}
2741
3222
end:
2742
3223
2743
3224
if(debug){
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2745
3232
}
2746
3233
2747
3234
/* Cleanup things */
2758
3245
2759
3246
if(gnutls_initialized){
2760
3247
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
2762
3248
gnutls_dh_params_deinit(mc.dh_params);
2763
3249
}
2764
3250
2787
3273
2788
3274
/* Re-raise privileges */
2789
3275
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
2793
3279
perror_plus("Failed to raise privileges");
2794
3280
} else {
2795
3281
2800
3286
/* Take down the network interfaces which were brought up */
2801
3287
{
2802
3288
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
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;
2809
3295
perror_plus("Failed to take down interface");
2810
3296
}
2811
3297
}
2816
3302
}
2817
3303
}
2818
3304
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
2822
3308
perror_plus("Failed to lower privileges permanently");
2823
3309
}
2824
3310
}
2826
3312
free(interfaces_to_take_down);
2827
3313
free(interfaces_hooks);
2828
3314
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
2829
3369
/* Removes the GPGME temp directory and all files inside */
2830
3370
if(tempdir != NULL){
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2871
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2873
}
3371
clean_dir_at(-1, tempdir, 0);
2874
3372
}
2875
3373
2876
3374
if(quit_now){
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Version: 2.0.2.dev0