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237.7.491
(compared to revision 237.7.855)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2018-02-22 19:33:54 UTC
- mfrom: (367 release)
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180222193354-uivyobeq4l5wyjt0
Merge from release branch
- 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
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
14
*
15
15
* This file is part of Mandos.
16
16
*
38
38
#define _FILE_OFFSET_BITS 64
39
39
#endif /* not _FILE_OFFSET_BITS */
40
40
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
44
49
#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,
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
53
#include <sys/ioctl.h> /* ioctl */
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
sockaddr_in6, PF_INET6,
56
SOCK_STREAM, uid_t, gid_t, open(),
57
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
*/
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
81
69
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 */
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
SIOCSIFFLAGS, if_indextoname(),
76
if_nametoindex(), IF_NAMESIZE */
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
*/
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
85
#include <iso646.h> /* not, or, and */
86
#include <argp.h> /* struct argp_option, error_t, struct
87
argp_state, struct argp,
88
argp_parse(), ARGP_KEY_ARG,
89
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
111
97
#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 */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
132
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
103
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
104
139
105
#ifdef __linux__
140
106
#include <sys/klog.h> /* klogctl() */
153
119
154
120
/* GnuTLS */
155
121
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
122
functions:
123
gnutls_*
124
init_gnutls_session(),
125
GNUTLS_* */
158
126
#include <gnutls/openpgp.h>
159
127
/* gnutls_certificate_set_openpgp_key_file(),
160
128
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
129
166
130
/* GPGME */
167
131
#include <gpgme.h> /* All GPGME types, constants and
168
132
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
133
gpgme_*
134
GPGME_PROTOCOL_OpenPGP,
135
GPG_ERR_NO_* */
172
136
173
137
#define BUFFER_SIZE 256
174
138
175
139
#define PATHDIR "/conf/conf.d/mandos"
176
140
#define SECKEY "seckey.txt"
177
141
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
143
182
144
bool debug = false;
310
272
return true;
311
273
}
312
274
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
275
/*
366
276
* Initialize GPGME.
367
277
*/
387
297
return false;
388
298
}
389
299
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
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
301
if(rc != GPG_ERR_NO_ERROR){
441
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
310
gpgme_strsource(rc), gpgme_strerror(rc));
450
311
return false;
451
312
}
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
313
528
314
ret = close(fd);
529
315
if(ret == -1){
570
356
/* Create new GPGME "context" */
571
357
rc = gpgme_new(&(mc->ctx));
572
358
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
575
362
return false;
576
363
}
577
364
613
400
/* Create new empty GPGME data buffer for the plaintext */
614
401
rc = gpgme_data_new(&dh_plain);
615
402
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
617
405
gpgme_strsource(rc), gpgme_strerror(rc));
618
406
gpgme_data_release(dh_crypto);
619
407
return -1;
632
420
if(result == NULL){
633
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
422
} 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");
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
641
427
if(result->file_name != NULL){
642
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
429
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
430
gpgme_recipient_t recipient;
431
recipient = result->recipients;
432
while(recipient != NULL){
647
433
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);
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
437
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
440
recipient = recipient->next;
652
441
}
653
442
}
654
443
}
736
525
const char *dhparamsfilename,
737
526
mandos_context *mc){
738
527
int ret;
528
unsigned int uret;
739
529
740
530
if(debug){
741
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
758
548
}
759
549
760
550
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
763
553
pubkeyfilename,
764
554
seckeyfilename);
765
555
}
766
556
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
557
ret = gnutls_certificate_set_openpgp_key_file
781
558
(mc->cred, pubkeyfilename, seckeyfilename,
782
559
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
560
if(ret != GNUTLS_E_SUCCESS){
787
561
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
565
safer_gnutls_strerror(ret));
862
636
}
863
637
if(dhparamsfilename == NULL){
864
638
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
639
/* Find out the optimal number of DH bits */
867
640
/* Try to read the private key file */
868
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
948
721
}
949
722
}
950
723
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
725
if(uret != 0){
953
726
mc->dh_bits = uret;
954
727
if(debug){
966
739
safer_gnutls_strerror(ret));
967
740
goto globalfail;
968
741
}
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);
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
983
752
}
984
753
}
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
755
986
756
return 0;
987
757
998
768
int ret;
999
769
/* GnuTLS session creation */
1000
770
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
));
771
ret = gnutls_init(session, GNUTLS_SERVER);
1009
772
if(quit_now){
1010
773
return -1;
1011
774
}
1059
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
823
__attribute__((unused)) const char *txt){}
1061
824
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
1062
877
/* Helper function to add_local_route() and delete_local_route() */
1063
878
__attribute__((nonnull, warn_unused_result))
1064
879
static bool add_delete_local_route(const bool add,
1103
918
ret = setgid(0);
1104
919
if(ret == -1){
1105
920
perror_plus("setgid");
1106
close(devnull);
1107
921
_exit(EX_NOPERM);
1108
922
}
1109
923
/* Reset supplementary groups */
1111
925
ret = setgroups(0, NULL);
1112
926
if(ret == -1){
1113
927
perror_plus("setgroups");
1114
close(devnull);
1115
928
_exit(EX_NOPERM);
1116
929
}
1117
930
}
1118
931
ret = dup2(devnull, STDIN_FILENO);
1119
932
if(ret == -1){
1120
933
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
934
_exit(EX_OSERR);
1123
935
}
1124
936
ret = close(devnull);
1125
937
if(ret == -1){
1126
938
perror_plus("close");
939
_exit(EX_OSERR);
1127
940
}
1128
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
942
if(ret == -1){
1164
977
}
1165
978
if(pid == -1){
1166
979
perror_plus("fork");
1167
close(devnull);
1168
980
return false;
1169
981
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
982
int status;
1175
983
pid_t pret = -1;
1176
984
errno = 0;
2497
2305
2498
2306
int main(int argc, char *argv[]){
2499
2307
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
2308
.priority = "SECURE256:!CTYPE-X.509"
2506
2309
":+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
2310
.current_server = NULL, .interfaces = NULL,
2511
2311
.interfaces_size = 0 };
2512
2312
AvahiSServiceBrowser *sb = NULL;
2523
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
2324
const char *seckey = PATHDIR "/" SECKEY;
2525
2325
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
2326
const char *dh_params_file = NULL;
2531
2327
char *interfaces_hooks = NULL;
2532
2328
2580
2376
{ .name = "pubkey", .key = 'p',
2581
2377
.arg = "FILE",
2582
2378
.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 },
2379
.group = 2 },
2600
2380
{ .name = "dh-bits", .key = 129,
2601
2381
.arg = "BITS",
2602
2382
.doc = "Bit length of the prime number used in the"
2658
2438
case 'p': /* --pubkey */
2659
2439
pubkey = arg;
2660
2440
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
2441
case 129: /* --dh-bits */
2672
2442
errno = 0;
2673
2443
tmpmax = strtoimax(arg, &tmp, 10);
2708
2478
argp_state_help(state, state->out_stream,
2709
2479
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
2480
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
2481
case -3: /* --usage */
2713
2482
argp_state_help(state, state->out_stream,
2714
2483
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
2484
case 'V': /* --version */
2717
2485
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
2486
exit(argp_err_exit_status);
2745
2513
}
2746
2514
2747
2515
{
2516
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2518
2748
2519
/* Re-raise privileges */
2749
2520
ret = raise_privileges();
2750
2521
if(ret != 0){
2753
2524
} else {
2754
2525
struct stat st;
2755
2526
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
2528
int seckey_fd = open(seckey, O_RDONLY);
2761
2529
if(seckey_fd == -1){
2820
2588
}
2821
2589
}
2822
2590
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
2591
/* Lower privileges */
2833
2592
ret = lower_privileges();
2834
2593
if(ret != 0){
3038
2797
goto end;
3039
2798
}
3040
2799
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
2800
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
2801
if(ret == -1){
3049
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2803
exitcode = EX_UNAVAILABLE;
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