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- Committer: Teddy Hogeborn
- Date: 2024-09-12 16:21:53 UTC
- mfrom: (1301 trunk)
- mto: This revision was merged to the branch mainline in revision 1302.
- Revision ID: teddy@recompile.se-20240912162153-grzvz1n3u1iruu93
Merge from trunk
- files added:
- debian/mandos-client.templates
- 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 © 2008-2016 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
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> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
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(), AT_REMOVEDIR */
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, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
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,
67
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
70
program_invocation_short_name */
71
#include <time.h> /* nanosleep(), time(), sleep() */
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
SIOCSIFFLAGS, if_indextoname(),
74
if_nametoindex(), IF_NAMESIZE */
75
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
76
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
77
*/
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
83
#include <iso646.h> /* not, or, and */
84
#include <argp.h> /* struct argp_option, error_t, struct
85
argp_state, struct argp,
86
argp_parse(), ARGP_KEY_ARG,
87
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
88
#include <signal.h> /* sigemptyset(), sigaddset(),
89
sigaction(), SIGTERM, sig_atomic_t,
90
raise() */
91
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
92
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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() */
93
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
94
WEXITSTATUS(), WTERMSIG() */
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
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 */
100
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
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 */
102
138
103
139
#ifdef __linux__
104
140
#include <sys/klog.h> /* klogctl() */
117
153
118
154
/* GnuTLS */
119
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
120
functions:
121
gnutls_*
122
init_gnutls_session(),
123
GNUTLS_* */
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
124
158
#include <gnutls/openpgp.h>
125
159
/* gnutls_certificate_set_openpgp_key_file(),
126
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
127
165
128
166
/* GPGME */
129
167
#include <gpgme.h> /* All GPGME types, constants and
130
168
functions:
131
gpgme_*
132
GPGME_PROTOCOL_OpenPGP,
133
GPG_ERR_NO_* */
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
134
172
135
173
#define BUFFER_SIZE 256
136
174
137
175
#define PATHDIR "/conf/conf.d/mandos"
138
176
#define SECKEY "seckey.txt"
139
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
140
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
141
181
142
182
bool debug = false;
270
310
return true;
271
311
}
272
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
273
365
/*
274
366
* Initialize GPGME.
275
367
*/
295
387
return false;
296
388
}
297
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
298
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
299
440
if(rc != GPG_ERR_NO_ERROR){
300
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
308
449
gpgme_strsource(rc), gpgme_strerror(rc));
309
450
return false;
310
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
}
311
527
312
528
ret = close(fd);
313
529
if(ret == -1){
354
570
/* Create new GPGME "context" */
355
571
rc = gpgme_new(&(mc->ctx));
356
572
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
360
575
return false;
361
576
}
362
577
398
613
/* Create new empty GPGME data buffer for the plaintext */
399
614
rc = gpgme_data_new(&dh_plain);
400
615
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
403
617
gpgme_strsource(rc), gpgme_strerror(rc));
404
618
gpgme_data_release(dh_crypto);
405
619
return -1;
418
632
if(result == NULL){
419
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
420
634
} else {
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
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");
425
641
if(result->file_name != NULL){
426
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
427
643
}
428
gpgme_recipient_t recipient;
429
recipient = result->recipients;
430
while(recipient != NULL){
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
431
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
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);
435
650
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
437
? "No" : "Yes");
438
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
439
652
}
440
653
}
441
654
}
523
736
const char *dhparamsfilename,
524
737
mandos_context *mc){
525
738
int ret;
526
unsigned int uret;
527
739
528
740
if(debug){
529
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
546
758
}
547
759
548
760
if(debug){
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" 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",
551
763
pubkeyfilename,
552
764
seckeyfilename);
553
765
}
554
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
555
780
ret = gnutls_certificate_set_openpgp_key_file
556
781
(mc->cred, pubkeyfilename, seckeyfilename,
557
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
558
786
if(ret != GNUTLS_E_SUCCESS){
559
787
fprintf_plus(stderr,
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
788
"Error[%d] while reading the key pair ('%s',"
561
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
791
safer_gnutls_strerror(ret));
611
839
}
612
840
params.size += (unsigned int)bytes_read;
613
841
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
614
846
if(params.data == NULL){
615
847
dhparamsfilename = NULL;
616
848
}
625
857
safer_gnutls_strerror(ret));
626
858
dhparamsfilename = NULL;
627
859
}
860
free(params.data);
628
861
} while(false);
629
862
}
630
863
if(dhparamsfilename == NULL){
631
864
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
632
866
/* Find out the optimal number of DH bits */
633
867
/* Try to read the private key file */
634
868
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
948
}
715
949
}
716
950
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
952
if(uret != 0){
719
953
mc->dh_bits = uret;
720
954
if(debug){
732
966
safer_gnutls_strerror(ret));
733
967
goto globalfail;
734
968
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
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);
745
983
}
746
984
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
748
985
749
986
return 0;
750
987
761
998
int ret;
762
999
/* GnuTLS session creation */
763
1000
do {
764
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
));
765
1009
if(quit_now){
766
1010
return -1;
767
1011
}
815
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
1060
__attribute__((unused)) const char *txt){}
817
1061
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
1062
/* Helper function to add_local_route() and delete_local_route() */
871
1063
__attribute__((nonnull, warn_unused_result))
872
1064
static bool add_delete_local_route(const bool add,
911
1103
ret = setgid(0);
912
1104
if(ret == -1){
913
1105
perror_plus("setgid");
1106
close(devnull);
914
1107
_exit(EX_NOPERM);
915
1108
}
916
1109
/* Reset supplementary groups */
918
1111
ret = setgroups(0, NULL);
919
1112
if(ret == -1){
920
1113
perror_plus("setgroups");
1114
close(devnull);
921
1115
_exit(EX_NOPERM);
922
1116
}
923
1117
}
924
1118
ret = dup2(devnull, STDIN_FILENO);
925
1119
if(ret == -1){
926
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
927
1122
_exit(EX_OSERR);
928
1123
}
929
1124
ret = close(devnull);
930
1125
if(ret == -1){
931
1126
perror_plus("close");
932
_exit(EX_OSERR);
933
1127
}
934
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
1129
if(ret == -1){
970
1164
}
971
1165
if(pid == -1){
972
1166
perror_plus("fork");
1167
close(devnull);
973
1168
return false;
974
1169
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
975
1174
int status;
976
1175
pid_t pret = -1;
977
1176
errno = 0;
1077
1276
bool match = false;
1078
1277
{
1079
1278
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1082
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
1283
match = true;
1084
1284
break;
1237
1437
with an explicit route added with the server's address.
1238
1438
1239
1439
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
1441
https://bugs.debian.org/587961
1242
1442
*/
1243
1443
if(debug){
1423
1623
&decrypted_buffer, mc);
1424
1624
if(decrypted_buffer_size >= 0){
1425
1625
1626
clearerr(stdout);
1426
1627
written = 0;
1427
1628
while(written < (size_t) decrypted_buffer_size){
1428
1629
if(quit_now){
1444
1645
}
1445
1646
written += (size_t)ret;
1446
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
}
1447
1658
retval = 0;
1448
1659
}
1449
1660
}
1480
1691
return retval;
1481
1692
}
1482
1693
1483
__attribute__((nonnull))
1484
1694
static void resolve_callback(AvahiSServiceResolver *r,
1485
1695
AvahiIfIndex interface,
1486
1696
AvahiProtocol proto,
1641
1851
perror_plus("ioctl SIOCGIFFLAGS");
1642
1852
errno = old_errno;
1643
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1858
}
1644
1859
return false;
1645
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1646
1866
return true;
1647
1867
}
1648
1868
1909
2129
return;
1910
2130
}
1911
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
}
1912
2137
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
2138
runnable_hook, alphasort);
1914
2139
if(numhooks == -1){
1915
2140
perror_plus("scandir");
2141
close(devnull);
1916
2142
return;
1917
2143
}
1918
2144
struct dirent *direntry;
1919
2145
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
2146
for(int i = 0; i < numhooks; i++){
1926
2147
direntry = direntries[i];
1927
2148
if(debug){
2183
2404
2184
2405
/* Sleep checking until interface is running.
2185
2406
Check every 0.25s, up to total time of delay */
2186
for(int i=0; i < delay * 4; i++){
2407
for(int i = 0; i < delay * 4; i++){
2187
2408
if(interface_is_running(interface)){
2188
2409
break;
2189
2410
}
2276
2497
2277
2498
int main(int argc, char *argv[]){
2278
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
2279
2505
.priority = "SECURE256:!CTYPE-X.509"
2280
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
2281
2510
.current_server = NULL, .interfaces = NULL,
2282
2511
.interfaces_size = 0 };
2283
2512
AvahiSServiceBrowser *sb = NULL;
2294
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2295
2524
const char *seckey = PATHDIR "/" SECKEY;
2296
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
2297
2530
const char *dh_params_file = NULL;
2298
2531
char *interfaces_hooks = NULL;
2299
2532
2347
2580
{ .name = "pubkey", .key = 'p',
2348
2581
.arg = "FILE",
2349
2582
.doc = "OpenPGP public key file base name",
2350
.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 },
2351
2600
{ .name = "dh-bits", .key = 129,
2352
2601
.arg = "BITS",
2353
2602
.doc = "Bit length of the prime number used in the"
2409
2658
case 'p': /* --pubkey */
2410
2659
pubkey = arg;
2411
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;
2412
2671
case 129: /* --dh-bits */
2413
2672
errno = 0;
2414
2673
tmpmax = strtoimax(arg, &tmp, 10);
2449
2708
argp_state_help(state, state->out_stream,
2450
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2451
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2452
2712
case -3: /* --usage */
2453
2713
argp_state_help(state, state->out_stream,
2454
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2455
2716
case 'V': /* --version */
2456
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2457
2718
exit(argp_err_exit_status);
2484
2745
}
2485
2746
2486
2747
{
2487
/* Work around Debian bug #633582:
2488
<http://bugs.debian.org/633582> */
2489
2490
2748
/* Re-raise privileges */
2491
2749
ret = raise_privileges();
2492
2750
if(ret != 0){
2495
2753
} else {
2496
2754
struct stat st;
2497
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2498
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2499
2760
int seckey_fd = open(seckey, O_RDONLY);
2500
2761
if(seckey_fd == -1){
2559
2820
}
2560
2821
}
2561
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
2562
2832
/* Lower privileges */
2563
2833
ret = lower_privileges();
2564
2834
if(ret != 0){
2768
3038
goto end;
2769
3039
}
2770
3040
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
2771
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
2772
3048
if(ret == -1){
2773
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2774
3050
exitcode = EX_UNAVAILABLE;
2946
3222
end:
2947
3223
2948
3224
if(debug){
2949
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
}
2950
3232
}
2951
3233
2952
3234
/* Cleanup things */
3004
3286
/* Take down the network interfaces which were brought up */
3005
3287
{
3006
3288
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3010
3292
ret = take_down_interface(interface);
3011
3293
if(ret != 0){
3012
3294
errno = ret;
3041
3323
| O_PATH));
3042
3324
if(dir_fd == -1){
3043
3325
perror_plus("open");
3326
return;
3044
3327
}
3045
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3046
3329
notdotentries, alphasort);
3063
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
3347
dret = 0;
3065
3348
}
3066
if(dret == -1){
3349
if((dret == -1) and (errno != ENOENT)){
3067
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
3351
direntries[i]->d_name, strerror(errno));
3069
3352
}
3073
3356
3074
3357
/* need to clean even if 0 because man page doesn't specify */
3075
3358
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
3360
if(dret == -1 and errno != ENOENT){
3081
3361
perror_plus("rmdir");
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0