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237.7.307
(compared to revision 237.7.831)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-06 20:29:34 UTC
- mfrom: (237.25.6 route-external)
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150706202934-09j06jm2fiw1bn80
Merge change to add local route when network is "unreachable".
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- 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 © 2008-2015 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
38
37
#define _FILE_OFFSET_BITS 64
39
38
#endif /* not _FILE_OFFSET_BITS */
40
39
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
96
strsignal() */
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
103
S_IXOTH, lstat() */
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
80
#include <argp.h> /* struct argp_option, error_t, struct
81
argp_state, struct argp,
82
argp_parse(), ARGP_KEY_ARG,
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
111
91
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
114
WTERMSIG() */
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
118
SIG_IGN, raise() */
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
129
strtoimax() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
132
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
97
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
138
98
139
99
#ifdef __linux__
140
100
#include <sys/klog.h> /* klogctl() */
153
113
154
114
/* GnuTLS */
155
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
116
functions:
117
gnutls_*
118
init_gnutls_session(),
119
GNUTLS_* */
158
120
#include <gnutls/openpgp.h>
159
121
/* gnutls_certificate_set_openpgp_key_file(),
160
122
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
164
#endif
165
123
166
124
/* GPGME */
167
125
#include <gpgme.h> /* All GPGME types, constants and
168
126
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
127
gpgme_*
128
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_* */
172
130
173
131
#define BUFFER_SIZE 256
174
132
175
133
#define PATHDIR "/conf/conf.d/mandos"
176
134
#define SECKEY "seckey.txt"
177
135
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
137
182
138
bool debug = false;
310
266
return true;
311
267
}
312
268
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
269
/*
366
270
* Initialize GPGME.
367
271
*/
387
291
return false;
388
292
}
389
293
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
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
295
if(rc != GPG_ERR_NO_ERROR){
441
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
304
gpgme_strsource(rc), gpgme_strerror(rc));
450
305
return false;
451
306
}
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
307
528
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
309
if(ret == -1){
530
310
perror_plus("close");
531
311
}
570
350
/* Create new GPGME "context" */
571
351
rc = gpgme_new(&(mc->ctx));
572
352
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
575
356
return false;
576
357
}
577
358
613
394
/* Create new empty GPGME data buffer for the plaintext */
614
395
rc = gpgme_data_new(&dh_plain);
615
396
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
617
399
gpgme_strsource(rc), gpgme_strerror(rc));
618
400
gpgme_data_release(dh_crypto);
619
401
return -1;
632
414
if(result == NULL){
633
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
416
} 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");
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);
641
421
if(result->file_name != NULL){
642
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
423
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
647
427
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);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
431
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
652
435
}
653
436
}
654
437
}
730
513
fprintf_plus(stderr, "GnuTLS: %s", string);
731
514
}
732
515
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
734
517
static int init_gnutls_global(const char *pubkeyfilename,
735
518
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
519
mandos_context *mc){
738
520
int ret;
521
unsigned int uret;
739
522
740
523
if(debug){
741
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
525
}
743
526
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
531
return -1;
532
}
533
744
534
if(debug){
745
535
/* "Use a log level over 10 to enable all debugging options."
746
536
* - GnuTLS manual
754
544
if(ret != GNUTLS_E_SUCCESS){
755
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
757
548
return -1;
758
549
}
759
550
760
551
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
763
554
pubkeyfilename,
764
555
seckeyfilename);
765
556
}
766
557
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
558
ret = gnutls_certificate_set_openpgp_key_file
781
559
(mc->cred, pubkeyfilename, seckeyfilename,
782
560
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
561
if(ret != GNUTLS_E_SUCCESS){
787
562
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
566
safer_gnutls_strerror(ret));
800
575
safer_gnutls_strerror(ret));
801
576
goto globalfail;
802
577
}
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;
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
814
585
while(true){
815
params_capacity = incbuffer((char **)¶ms.data,
816
(size_t)params.size,
817
(size_t)params_capacity);
818
if(params_capacity == 0){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
819
590
perror_plus("incbuffer");
820
free(params.data);
821
params.data = NULL;
822
dhparamsfilename = NULL;
591
free(buffer.data);
592
buffer.data = NULL;
823
593
break;
824
594
}
825
ssize_t bytes_read = read(dhpfile,
826
params.data + params.size,
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
827
596
BUFFER_SIZE);
828
597
/* EOF */
829
598
if(bytes_read == 0){
832
601
/* check bytes_read for failure */
833
602
if(bytes_read < 0){
834
603
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);
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
910
627
if(ret != GNUTLS_E_SUCCESS){
911
fprintf_plus(stderr, "Error initializing OpenPGP key"
912
" structure: %s",
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
913
629
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
}
630
privkey = NULL;
938
631
}
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)));
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
948
644
}
949
645
}
950
646
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
if(uret != 0){
953
mc->dh_bits = uret;
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
954
650
if(debug){
955
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
956
" implies %u DH bits; using that.\n",
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
957
653
safe_string(gnutls_sec_param_get_name
958
(sec_param)),
959
mc->dh_bits);
654
(sec_param)));
960
655
}
961
} else {
962
fprintf_plus(stderr, "Failed to get implied number of DH"
963
" bits for security parameter \"%s\"): %s\n",
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
964
664
safe_string(gnutls_sec_param_get_name
965
665
(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
666
mc->dh_bits);
974
667
}
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);
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
983
674
}
984
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
683
goto globalfail;
684
}
685
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
687
986
688
return 0;
987
689
988
690
globalfail:
989
691
990
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
991
694
gnutls_dh_params_deinit(mc->dh_params);
992
695
return -1;
993
696
}
998
701
int ret;
999
702
/* GnuTLS session creation */
1000
703
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
));
704
ret = gnutls_init(session, GNUTLS_SERVER);
1009
705
if(quit_now){
1010
706
return -1;
1011
707
}
1052
748
/* ignore client certificate if any. */
1053
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1054
750
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
1055
753
return 0;
1056
754
}
1057
755
1059
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
758
__attribute__((unused)) const char *txt){}
1061
759
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
1062
812
/* Helper function to add_local_route() and delete_local_route() */
1063
813
__attribute__((nonnull, warn_unused_result))
1064
814
static bool add_delete_local_route(const bool add,
1103
853
ret = setgid(0);
1104
854
if(ret == -1){
1105
855
perror_plus("setgid");
1106
close(devnull);
1107
856
_exit(EX_NOPERM);
1108
857
}
1109
858
/* Reset supplementary groups */
1111
860
ret = setgroups(0, NULL);
1112
861
if(ret == -1){
1113
862
perror_plus("setgroups");
1114
close(devnull);
1115
863
_exit(EX_NOPERM);
1116
864
}
1117
865
}
1118
866
ret = dup2(devnull, STDIN_FILENO);
1119
867
if(ret == -1){
1120
868
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
869
_exit(EX_OSERR);
1123
870
}
1124
ret = close(devnull);
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1125
872
if(ret == -1){
1126
873
perror_plus("close");
874
_exit(EX_OSERR);
1127
875
}
1128
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
877
if(ret == -1){
1143
891
helper, O_RDONLY));
1144
892
if(helper_fd == -1){
1145
893
perror_plus("openat");
1146
close(helperdir_fd);
1147
894
_exit(EX_UNAVAILABLE);
1148
895
}
1149
close(helperdir_fd);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
1150
897
#ifdef __GNUC__
1151
898
#pragma GCC diagnostic push
1152
899
#pragma GCC diagnostic ignored "-Wcast-qual"
1164
911
}
1165
912
if(pid == -1){
1166
913
perror_plus("fork");
1167
close(devnull);
1168
914
return false;
1169
915
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
916
int status;
1175
917
pid_t pret = -1;
1176
918
errno = 0;
1276
1018
bool match = false;
1277
1019
{
1278
1020
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1282
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
1024
match = true;
1284
1025
break;
1326
1067
goto mandos_end;
1327
1068
}
1328
1069
1070
memset(&to, 0, sizeof(to));
1329
1071
if(af == AF_INET6){
1330
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1331
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1332
ret = inet_pton(af, ip, &to6->sin6_addr);
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1333
1074
} else { /* IPv4 */
1334
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1335
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1336
ret = inet_pton(af, ip, &to4->sin_addr);
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1337
1077
}
1338
1078
if(ret < 0 ){
1339
1079
int e = errno;
1418
1158
sizeof(struct sockaddr_in));
1419
1159
}
1420
1160
if(ret < 0){
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1161
if(errno == ENETUNREACH
1422
1162
and if_index != AVAHI_IF_UNSPEC
1423
1163
and connect_to == NULL
1424
1164
and not route_added and
1437
1177
with an explicit route added with the server's address.
1438
1178
1439
1179
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
1181
https://bugs.debian.org/587961
1442
1182
*/
1443
1183
if(debug){
1623
1363
&decrypted_buffer, mc);
1624
1364
if(decrypted_buffer_size >= 0){
1625
1365
1626
clearerr(stdout);
1627
1366
written = 0;
1628
1367
while(written < (size_t) decrypted_buffer_size){
1629
1368
if(quit_now){
1645
1384
}
1646
1385
written += (size_t)ret;
1647
1386
}
1648
ret = fflush(stdout);
1649
if(ret != 0){
1650
int e = errno;
1651
if(debug){
1652
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1653
strerror(errno));
1654
}
1655
errno = e;
1656
goto mandos_end;
1657
}
1658
1387
retval = 0;
1659
1388
}
1660
1389
}
1673
1402
free(decrypted_buffer);
1674
1403
free(buffer);
1675
1404
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
1406
}
1678
1407
if(ret == -1){
1679
1408
if(e == 0){
1691
1420
return retval;
1692
1421
}
1693
1422
1423
__attribute__((nonnull))
1694
1424
static void resolve_callback(AvahiSServiceResolver *r,
1695
1425
AvahiIfIndex interface,
1696
1426
AvahiProtocol proto,
1833
1563
__attribute__((nonnull, warn_unused_result))
1834
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1565
int ret;
1836
int old_errno;
1566
error_t ret_errno;
1837
1567
1838
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1569
if(s < 0){
1840
old_errno = errno;
1570
ret_errno = errno;
1841
1571
perror_plus("socket");
1842
errno = old_errno;
1572
errno = ret_errno;
1843
1573
return false;
1844
1574
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1575
strcpy(ifr->ifr_name, ifname);
1847
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1577
if(ret == -1){
1849
1578
if(debug){
1850
old_errno = errno;
1579
ret_errno = errno;
1851
1580
perror_plus("ioctl SIOCGIFFLAGS");
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1581
errno = ret_errno;
1858
1582
}
1859
1583
return false;
1860
1584
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1585
return true;
1867
1586
}
1868
1587
2129
1848
return;
2130
1849
}
2131
1850
}
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
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
2137
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
2139
1863
if(numhooks == -1){
2140
1864
perror_plus("scandir");
2141
close(devnull);
2142
1865
return;
2143
1866
}
2144
1867
struct dirent *direntry;
2145
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
2146
1874
for(int i = 0; i < numhooks; i++){
2147
1875
direntry = direntries[i];
2148
1876
if(debug){
2219
1947
perror_plus("openat");
2220
1948
_exit(EXIT_FAILURE);
2221
1949
}
2222
if(close(hookdir_fd) == -1){
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2223
1951
perror_plus("close");
2224
1952
_exit(EXIT_FAILURE);
2225
1953
}
2228
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
2229
1957
_exit(EX_OSERR);
2230
1958
}
2231
ret = close(devnull);
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2232
1960
if(ret == -1){
2233
1961
perror_plus("close");
2234
1962
_exit(EX_OSERR);
2283
2011
free(direntry);
2284
2012
}
2285
2013
free(direntries);
2286
if(close(hookdir_fd) == -1){
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2287
2015
perror_plus("close");
2288
2016
} else {
2289
2017
hookdir_fd = -1;
2292
2020
}
2293
2021
2294
2022
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2298
2026
int ret;
2299
2027
struct ifreq network;
2300
2028
unsigned int if_index = if_nametoindex(interface);
2310
2038
}
2311
2039
2312
2040
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2041
error_t ret_errno = 0, ioctl_errno = 0;
2315
2042
if(not get_flags(interface, &network)){
2316
2043
ret_errno = errno;
2317
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2330
2057
}
2331
2058
2332
2059
if(quit_now){
2333
ret = close(sd);
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2334
2061
if(ret == -1){
2335
2062
perror_plus("close");
2336
2063
}
2386
2113
}
2387
2114
2388
2115
/* Close the socket */
2389
ret = close(sd);
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
2117
if(ret == -1){
2391
2118
perror_plus("close");
2392
2119
}
2404
2131
2405
2132
/* Sleep checking until interface is running.
2406
2133
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
2134
for(int i=0; i < delay * 4; i++){
2408
2135
if(interface_is_running(interface)){
2409
2136
break;
2410
2137
}
2420
2147
}
2421
2148
2422
2149
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2425
2152
struct ifreq network;
2426
2153
unsigned int if_index = if_nametoindex(interface);
2427
2154
if(if_index == 0){
2430
2157
return ENXIO;
2431
2158
}
2432
2159
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2160
error_t ret_errno = 0, ioctl_errno = 0;
2435
2161
if(not get_flags(interface, &network) and debug){
2436
2162
ret_errno = errno;
2437
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2475
2201
}
2476
2202
2477
2203
/* Close the socket */
2478
int ret = close(sd);
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
2205
if(ret == -1){
2480
2206
perror_plus("close");
2481
2207
}
2497
2223
2498
2224
int main(int argc, char *argv[]){
2499
2225
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 };
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2512
2229
AvahiSServiceBrowser *sb = NULL;
2513
2230
error_t ret_errno;
2514
2231
int ret;
2523
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
2241
const char *seckey = PATHDIR "/" SECKEY;
2525
2242
const char *pubkey = PATHDIR "/" PUBKEY;
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
2527
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2528
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2529
#endif
2530
const char *dh_params_file = NULL;
2531
2243
char *interfaces_hooks = NULL;
2532
2244
2533
2245
bool gnutls_initialized = false;
2580
2292
{ .name = "pubkey", .key = 'p',
2581
2293
.arg = "FILE",
2582
2294
.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 },
2295
.group = 2 },
2600
2296
{ .name = "dh-bits", .key = 129,
2601
2297
.arg = "BITS",
2602
2298
.doc = "Bit length of the prime number used in the"
2603
2299
" Diffie-Hellman key exchange",
2604
2300
.group = 2 },
2605
{ .name = "dh-params", .key = 134,
2606
.arg = "FILE",
2607
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2608
" for the Diffie-Hellman key exchange",
2609
.group = 2 },
2610
2301
{ .name = "priority", .key = 130,
2611
2302
.arg = "STRING",
2612
2303
.doc = "GnuTLS priority string for the TLS handshake",
2658
2349
case 'p': /* --pubkey */
2659
2350
pubkey = arg;
2660
2351
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
2352
case 129: /* --dh-bits */
2672
2353
errno = 0;
2673
2354
tmpmax = strtoimax(arg, &tmp, 10);
2677
2358
}
2678
2359
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2679
2360
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2683
2361
case 130: /* --priority */
2684
2362
mc.priority = arg;
2685
2363
break;
2708
2386
argp_state_help(state, state->out_stream,
2709
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2389
case -3: /* --usage */
2713
2390
argp_state_help(state, state->out_stream,
2714
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2392
case 'V': /* --version */
2717
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2394
exit(argp_err_exit_status);
2727
2403
.args_doc = "",
2728
2404
.doc = "Mandos client -- Get and decrypt"
2729
2405
" passwords from a Mandos server" };
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2733
2409
case 0:
2734
2410
break;
2735
2411
case ENOMEM:
2736
2412
default:
2737
errno = ret_errno;
2413
errno = ret;
2738
2414
perror_plus("argp_parse");
2739
2415
exitcode = EX_OSERR;
2740
2416
goto end;
2745
2421
}
2746
2422
2747
2423
{
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2426
2748
2427
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2752
2431
perror_plus("Failed to raise privileges");
2753
2432
} else {
2754
2433
struct stat st;
2755
2434
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2436
int seckey_fd = open(seckey, O_RDONLY);
2761
2437
if(seckey_fd == -1){
2773
2449
}
2774
2450
}
2775
2451
}
2776
close(seckey_fd);
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
2453
}
2778
2454
}
2779
2455
2794
2470
}
2795
2471
}
2796
2472
}
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
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2474
}
2475
}
2476
2832
2477
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2836
2481
perror_plus("Failed to lower privileges");
2837
2482
}
2838
2483
}
3008
2653
errno = bring_up_interface(interface, delay);
3009
2654
if(not interface_was_up){
3010
2655
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2656
perror_plus("Failed to bring up interface");
3013
2657
} else {
3014
2658
errno = argz_add(&interfaces_to_take_down,
3015
2659
&interfaces_to_take_down_size,
3038
2682
goto end;
3039
2683
}
3040
2684
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
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
3048
2686
if(ret == -1){
3049
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2688
exitcode = EX_UNAVAILABLE;
3172
2810
3173
2811
/* Allocate a new server */
3174
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2813
&config, NULL, NULL, &ret_errno);
3176
2814
3177
2815
/* Free the Avahi configuration data */
3178
2816
avahi_server_config_free(&config);
3181
2819
/* Check if creating the Avahi server object succeeded */
3182
2820
if(mc.server == NULL){
3183
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2822
avahi_strerror(ret_errno));
3185
2823
exitcode = EX_UNAVAILABLE;
3186
2824
goto end;
3187
2825
}
3222
2860
end:
3223
2861
3224
2862
if(debug){
3225
if(signal_received){
3226
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3227
argv[0], signal_received,
3228
strsignal(signal_received));
3229
} else {
3230
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3231
}
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2864
}
3233
2865
3234
2866
/* Cleanup things */
3245
2877
3246
2878
if(gnutls_initialized){
3247
2879
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
3248
2881
gnutls_dh_params_deinit(mc.dh_params);
3249
2882
}
3250
2883
3273
2906
3274
2907
/* Re-raise privileges */
3275
2908
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3279
2912
perror_plus("Failed to raise privileges");
3280
2913
} else {
3281
2914
3286
2919
/* Take down the network interfaces which were brought up */
3287
2920
{
3288
2921
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3292
ret = take_down_interface(interface);
3293
if(ret != 0){
3294
errno = ret;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
3295
2928
perror_plus("Failed to take down interface");
3296
2929
}
3297
2930
}
3302
2935
}
3303
2936
}
3304
2937
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3308
2941
perror_plus("Failed to lower privileges permanently");
3309
2942
}
3310
2943
}
3312
2945
free(interfaces_to_take_down);
3313
2946
free(interfaces_hooks);
3314
2947
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
3317
struct dirent **direntries = NULL;
3318
int dret;
3319
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3320
O_RDONLY
3321
| O_NOFOLLOW
3322
| O_DIRECTORY
3323
| O_PATH));
3324
if(dir_fd == -1){
3325
perror_plus("open");
3326
return;
3327
}
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3329
notdotentries, alphasort);
3330
if(numentries >= 0){
3331
for(int i = 0; i < numentries; i++){
3332
if(debug){
3333
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3334
dirname, direntries[i]->d_name);
3335
}
3336
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3337
if(dret == -1){
3338
if(errno == EISDIR){
3339
dret = unlinkat(dir_fd, direntries[i]->d_name,
3340
AT_REMOVEDIR);
3341
}
3342
if((dret == -1) and (errno == ENOTEMPTY)
3343
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3344
== 0) and (level == 0)){
3345
/* Recurse only in this special case */
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3347
dret = 0;
3348
}
3349
if((dret == -1) and (errno != ENOENT)){
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
direntries[i]->d_name, strerror(errno));
3352
}
3353
}
3354
free(direntries[i]);
3355
}
3356
3357
/* need to clean even if 0 because man page doesn't specify */
3358
free(direntries);
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
if(dret == -1 and errno != ENOENT){
3361
perror_plus("rmdir");
3362
}
3363
} else {
3364
perror_plus("scandirat");
3365
}
3366
close(dir_fd);
3367
}
3368
3369
2948
/* Removes the GPGME temp directory and all files inside */
3370
2949
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2992
}
3372
2993
}
3373
2994
3374
2995
if(quit_now){
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Version: 2.0.2.dev0