To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 355
- compare with another revision
- download diff
- download tarball
- view history from revision 355
- Committer: Teddy Hogeborn
- Date: 2016-10-08 04:33:04 UTC
- Revision ID: teddy@recompile.se-20161008043304-u4wqp55iacqfbwhb
Tags: version-1.7.13-1
* Makefile (version): Change to 1.7.13.
* NEWS (Version 1.7.13): Add new entry.
* debian/changelog (1.7.13-1): - '' -
* NEWS (Version 1.7.13): Add new entry.
* debian/changelog (1.7.13-1): - '' -
- files added:
- initramfs-tools-hook-conf
- files removed:
- debian/mandos-client.templates
- debian/tests
- dracut-module
- 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 © 2008-2022 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
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
38
37
#define _FILE_OFFSET_BITS 64
39
38
#endif /* not _FILE_OFFSET_BITS */
40
39
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
52
#include <sys/ioctl.h> /* ioctl */
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
sockaddr_in6, PF_INET6,
55
SOCK_STREAM, uid_t, gid_t, open(),
56
opendir(), DIR */
57
#include <sys/stat.h> /* open(), S_ISREG */
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
*/
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
81
68
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 */
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
71
program_invocation_short_name */
72
#include <time.h> /* nanosleep(), time(), sleep() */
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
74
SIOCSIFFLAGS, if_indextoname(),
75
if_nametoindex(), IF_NAMESIZE */
76
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
77
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
78
*/
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
84
#include <iso646.h> /* not, or, and */
85
#include <argp.h> /* struct argp_option, error_t, struct
86
argp_state, struct argp,
87
argp_parse(), ARGP_KEY_ARG,
88
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
89
#include <signal.h> /* sigemptyset(), sigaddset(),
90
sigaction(), SIGTERM, sig_atomic_t,
91
raise() */
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
111
96
#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 */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
132
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
102
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
103
139
104
#ifdef __linux__
140
105
#include <sys/klog.h> /* klogctl() */
153
118
154
119
/* GnuTLS */
155
120
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
121
functions:
122
gnutls_*
123
init_gnutls_session(),
124
GNUTLS_* */
158
125
#include <gnutls/openpgp.h>
159
126
/* gnutls_certificate_set_openpgp_key_file(),
160
127
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
128
166
129
/* GPGME */
167
130
#include <gpgme.h> /* All GPGME types, constants and
168
131
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
132
gpgme_*
133
GPGME_PROTOCOL_OpenPGP,
134
GPG_ERR_NO_* */
172
135
173
136
#define BUFFER_SIZE 256
174
137
175
138
#define PATHDIR "/conf/conf.d/mandos"
176
139
#define SECKEY "seckey.txt"
177
140
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
142
182
143
bool debug = false;
310
271
return true;
311
272
}
312
273
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
274
/*
366
275
* Initialize GPGME.
367
276
*/
387
296
return false;
388
297
}
389
298
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
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
300
if(rc != GPG_ERR_NO_ERROR){
441
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
309
gpgme_strsource(rc), gpgme_strerror(rc));
450
310
return false;
451
311
}
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
312
528
313
ret = close(fd);
529
314
if(ret == -1){
570
355
/* Create new GPGME "context" */
571
356
rc = gpgme_new(&(mc->ctx));
572
357
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
575
361
return false;
576
362
}
577
363
613
399
/* Create new empty GPGME data buffer for the plaintext */
614
400
rc = gpgme_data_new(&dh_plain);
615
401
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
617
404
gpgme_strsource(rc), gpgme_strerror(rc));
618
405
gpgme_data_release(dh_crypto);
619
406
return -1;
632
419
if(result == NULL){
633
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
421
} 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");
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
641
426
if(result->file_name != NULL){
642
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
428
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
429
gpgme_recipient_t recipient;
430
recipient = result->recipients;
431
while(recipient != NULL){
647
432
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);
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
436
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
439
recipient = recipient->next;
652
440
}
653
441
}
654
442
}
736
524
const char *dhparamsfilename,
737
525
mandos_context *mc){
738
526
int ret;
527
unsigned int uret;
739
528
740
529
if(debug){
741
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
758
547
}
759
548
760
549
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
763
552
pubkeyfilename,
764
553
seckeyfilename);
765
554
}
766
555
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
556
ret = gnutls_certificate_set_openpgp_key_file
781
557
(mc->cred, pubkeyfilename, seckeyfilename,
782
558
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
559
if(ret != GNUTLS_E_SUCCESS){
787
560
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
564
safer_gnutls_strerror(ret));
839
612
}
840
613
params.size += (unsigned int)bytes_read;
841
614
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
846
615
if(params.data == NULL){
847
616
dhparamsfilename = NULL;
848
617
}
862
631
}
863
632
if(dhparamsfilename == NULL){
864
633
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
634
/* Find out the optimal number of DH bits */
867
635
/* Try to read the private key file */
868
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
948
716
}
949
717
}
950
718
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
720
if(uret != 0){
953
721
mc->dh_bits = uret;
954
722
if(debug){
966
734
safer_gnutls_strerror(ret));
967
735
goto globalfail;
968
736
}
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);
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
983
747
}
984
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
750
986
751
return 0;
987
752
998
763
int ret;
999
764
/* GnuTLS session creation */
1000
765
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
));
766
ret = gnutls_init(session, GNUTLS_SERVER);
1009
767
if(quit_now){
1010
768
return -1;
1011
769
}
1059
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
818
__attribute__((unused)) const char *txt){}
1061
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
1062
872
/* Helper function to add_local_route() and delete_local_route() */
1063
873
__attribute__((nonnull, warn_unused_result))
1064
874
static bool add_delete_local_route(const bool add,
1103
913
ret = setgid(0);
1104
914
if(ret == -1){
1105
915
perror_plus("setgid");
1106
close(devnull);
1107
916
_exit(EX_NOPERM);
1108
917
}
1109
918
/* Reset supplementary groups */
1111
920
ret = setgroups(0, NULL);
1112
921
if(ret == -1){
1113
922
perror_plus("setgroups");
1114
close(devnull);
1115
923
_exit(EX_NOPERM);
1116
924
}
1117
925
}
1118
926
ret = dup2(devnull, STDIN_FILENO);
1119
927
if(ret == -1){
1120
928
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
929
_exit(EX_OSERR);
1123
930
}
1124
931
ret = close(devnull);
1125
932
if(ret == -1){
1126
933
perror_plus("close");
934
_exit(EX_OSERR);
1127
935
}
1128
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
937
if(ret == -1){
1164
972
}
1165
973
if(pid == -1){
1166
974
perror_plus("fork");
1167
close(devnull);
1168
975
return false;
1169
976
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
977
int status;
1175
978
pid_t pret = -1;
1176
979
errno = 0;
1276
1079
bool match = false;
1277
1080
{
1278
1081
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1082
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1083
interface))){
1282
1084
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
1085
match = true;
1284
1086
break;
1691
1493
return retval;
1692
1494
}
1693
1495
1496
__attribute__((nonnull))
1694
1497
static void resolve_callback(AvahiSServiceResolver *r,
1695
1498
AvahiIfIndex interface,
1696
1499
AvahiProtocol proto,
1851
1654
perror_plus("ioctl SIOCGIFFLAGS");
1852
1655
errno = old_errno;
1853
1656
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1858
}
1859
1657
return false;
1860
1658
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1659
return true;
1867
1660
}
1868
1661
2129
1922
return;
2130
1923
}
2131
1924
}
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
}
2137
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
1926
runnable_hook, alphasort);
2139
1927
if(numhooks == -1){
2140
1928
perror_plus("scandir");
2141
close(devnull);
2142
1929
return;
2143
1930
}
2144
1931
struct dirent *direntry;
2145
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
2146
1938
for(int i = 0; i < numhooks; i++){
2147
1939
direntry = direntries[i];
2148
1940
if(debug){
2404
2196
2405
2197
/* Sleep checking until interface is running.
2406
2198
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2408
2200
if(interface_is_running(interface)){
2409
2201
break;
2410
2202
}
2497
2289
2498
2290
int main(int argc, char *argv[]){
2499
2291
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
2292
.priority = "SECURE256:!CTYPE-X.509"
2506
2293
":+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
2294
.current_server = NULL, .interfaces = NULL,
2511
2295
.interfaces_size = 0 };
2512
2296
AvahiSServiceBrowser *sb = NULL;
2523
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
2308
const char *seckey = PATHDIR "/" SECKEY;
2525
2309
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
2310
const char *dh_params_file = NULL;
2531
2311
char *interfaces_hooks = NULL;
2532
2312
2580
2360
{ .name = "pubkey", .key = 'p',
2581
2361
.arg = "FILE",
2582
2362
.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 },
2363
.group = 2 },
2600
2364
{ .name = "dh-bits", .key = 129,
2601
2365
.arg = "BITS",
2602
2366
.doc = "Bit length of the prime number used in the"
2658
2422
case 'p': /* --pubkey */
2659
2423
pubkey = arg;
2660
2424
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
2425
case 129: /* --dh-bits */
2672
2426
errno = 0;
2673
2427
tmpmax = strtoimax(arg, &tmp, 10);
2708
2462
argp_state_help(state, state->out_stream,
2709
2463
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2464
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2465
case -3: /* --usage */
2713
2466
argp_state_help(state, state->out_stream,
2714
2467
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2468
case 'V': /* --version */
2717
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2470
exit(argp_err_exit_status);
2745
2497
}
2746
2498
2747
2499
{
2500
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2502
2748
2503
/* Re-raise privileges */
2749
2504
ret = raise_privileges();
2750
2505
if(ret != 0){
2753
2508
} else {
2754
2509
struct stat st;
2755
2510
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2512
int seckey_fd = open(seckey, O_RDONLY);
2761
2513
if(seckey_fd == -1){
2820
2572
}
2821
2573
}
2822
2574
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
2832
2575
/* Lower privileges */
2833
2576
ret = lower_privileges();
2834
2577
if(ret != 0){
3038
2781
goto end;
3039
2782
}
3040
2783
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
2784
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
3048
2785
if(ret == -1){
3049
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2787
exitcode = EX_UNAVAILABLE;
3286
3023
/* Take down the network interfaces which were brought up */
3287
3024
{
3288
3025
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3026
while((interface=argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3292
3029
ret = take_down_interface(interface);
3293
3030
if(ret != 0){
3294
3031
errno = ret;
3323
3060
| O_PATH));
3324
3061
if(dir_fd == -1){
3325
3062
perror_plus("open");
3326
return;
3327
3063
}
3328
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3329
3065
notdotentries, alphasort);
3346
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3347
3083
dret = 0;
3348
3084
}
3349
if((dret == -1) and (errno != ENOENT)){
3085
if(dret == -1){
3350
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
3087
direntries[i]->d_name, strerror(errno));
3352
3088
}
3356
3092
3357
3093
/* need to clean even if 0 because man page doesn't specify */
3358
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3359
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
3099
if(dret == -1 and errno != ENOENT){
3361
3100
perror_plus("rmdir");
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0