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- Committer: Teddy Hogeborn
- Date: 2019-02-09 23:23:26 UTC
- Revision ID: teddy@recompile.se-20190209232326-z1z2kzpgfixz7iaj
Add support for using raw public keys in TLS (RFC 7250)
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
- files added:
- bugs.xml
- files removed:
- initramfs-tools-hook-conf
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
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*
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* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
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* 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
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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* Mandos is free software: you can redistribute it and/or modify it
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* 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
*
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* Mandos is distributed in the hope that it will be useful, but
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* 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
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*
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* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@recompile.se>.
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*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
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*/
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect(),
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getnameinfo() */
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#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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ENOTEMPTY,
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program_invocation_short_name */
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#include <time.h> /* nanosleep(), time(), sleep() */
68
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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123
gnutls_*
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init_gnutls_session(),
119
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GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
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#include <gnutls/openpgp.h>
121
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/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
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GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
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/* GPGME */
125
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#include <gpgme.h> /* All GPGME types, constants and
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145
#define PATHDIR "/conf/conf.d/mandos"
134
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#define SECKEY "seckey.txt"
135
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
136
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#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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return true;
267
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}
268
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/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
269
335
/*
270
336
* Initialize GPGME.
271
337
*/
291
357
return false;
292
358
}
293
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
294
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
411
if(rc != GPG_ERR_NO_ERROR){
296
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
304
420
gpgme_strsource(rc), gpgme_strerror(rc));
305
421
return false;
306
422
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
307
498
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
309
500
if(ret == -1){
310
501
perror_plus("close");
311
502
}
350
541
/* Create new GPGME "context" */
351
542
rc = gpgme_new(&(mc->ctx));
352
543
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
356
546
return false;
357
547
}
358
548
394
584
/* Create new empty GPGME data buffer for the plaintext */
395
585
rc = gpgme_data_new(&dh_plain);
396
586
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
399
588
gpgme_strsource(rc), gpgme_strerror(rc));
400
589
gpgme_data_release(dh_crypto);
401
590
return -1;
414
603
if(result == NULL){
415
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
605
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
421
612
if(result->file_name != NULL){
422
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
423
614
}
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
427
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
431
621
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
435
623
}
436
624
}
437
625
}
513
701
fprintf_plus(stderr, "GnuTLS: %s", string);
514
702
}
515
703
516
__attribute__((nonnull, warn_unused_result))
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
705
static int init_gnutls_global(const char *pubkeyfilename,
518
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
519
708
mandos_context *mc){
520
709
int ret;
521
unsigned int uret;
522
710
523
711
if(debug){
524
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
525
713
}
526
714
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
534
715
if(debug){
535
716
/* "Use a log level over 10 to enable all debugging options."
536
717
* - GnuTLS manual
544
725
if(ret != GNUTLS_E_SUCCESS){
545
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
727
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
548
728
return -1;
549
729
}
550
730
551
731
if(debug){
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
554
734
pubkeyfilename,
555
735
seckeyfilename);
556
736
}
557
737
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
558
751
ret = gnutls_certificate_set_openpgp_key_file
559
752
(mc->cred, pubkeyfilename, seckeyfilename,
560
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
561
757
if(ret != GNUTLS_E_SUCCESS){
562
758
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
564
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
762
safer_gnutls_strerror(ret));
575
771
safer_gnutls_strerror(ret));
576
772
goto globalfail;
577
773
}
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;
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
585
785
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
590
790
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
593
794
break;
594
795
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
596
798
BUFFER_SIZE);
597
799
/* EOF */
598
800
if(bytes_read == 0){
601
803
/* check bytes_read for failure */
602
804
if(bytes_read < 0){
603
805
perror_plus("read");
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);
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
627
881
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
629
884
safer_gnutls_strerror(ret));
630
privkey = NULL;
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
631
909
}
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
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
644
919
}
645
920
}
646
921
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
650
925
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
653
928
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
929
(sec_param)),
930
mc->dh_bits);
655
931
}
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",
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
664
935
safe_string(gnutls_sec_param_get_name
665
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
666
944
mc->dh_bits);
667
945
}
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;
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
674
954
}
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);
955
}
687
956
688
957
return 0;
689
958
690
959
globalfail:
691
960
692
961
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
962
gnutls_dh_params_deinit(mc->dh_params);
695
963
return -1;
696
964
}
701
969
int ret;
702
970
/* GnuTLS session creation */
703
971
do {
704
ret = gnutls_init(session, GNUTLS_SERVER);
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
705
980
if(quit_now){
706
981
return -1;
707
982
}
748
1023
/* ignore client certificate if any. */
749
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
1025
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
753
1026
return 0;
754
1027
}
755
1028
757
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
1031
__attribute__((unused)) const char *txt){}
759
1032
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
812
1033
/* Helper function to add_local_route() and delete_local_route() */
813
1034
__attribute__((nonnull, warn_unused_result))
814
1035
static bool add_delete_local_route(const bool add,
868
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
869
1090
_exit(EX_OSERR);
870
1091
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1092
ret = close(devnull);
872
1093
if(ret == -1){
873
1094
perror_plus("close");
874
1095
_exit(EX_OSERR);
891
1112
helper, O_RDONLY));
892
1113
if(helper_fd == -1){
893
1114
perror_plus("openat");
1115
close(helperdir_fd);
894
1116
_exit(EX_UNAVAILABLE);
895
1117
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
1118
close(helperdir_fd);
897
1119
#ifdef __GNUC__
898
1120
#pragma GCC diagnostic push
899
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1018
1240
bool match = false;
1019
1241
{
1020
1242
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
1023
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
1247
match = true;
1025
1248
break;
1067
1290
goto mandos_end;
1068
1291
}
1069
1292
1070
memset(&to, 0, sizeof(to));
1071
1293
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
1074
1297
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
1077
1301
}
1078
1302
if(ret < 0 ){
1079
1303
int e = errno;
1158
1382
sizeof(struct sockaddr_in));
1159
1383
}
1160
1384
if(ret < 0){
1161
if(errno == ENETUNREACH
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1162
1386
and if_index != AVAHI_IF_UNSPEC
1163
1387
and connect_to == NULL
1164
1388
and not route_added and
1177
1401
with an explicit route added with the server's address.
1178
1402
1179
1403
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
1405
https://bugs.debian.org/587961
1182
1406
*/
1183
1407
if(debug){
1363
1587
&decrypted_buffer, mc);
1364
1588
if(decrypted_buffer_size >= 0){
1365
1589
1590
clearerr(stdout);
1366
1591
written = 0;
1367
1592
while(written < (size_t) decrypted_buffer_size){
1368
1593
if(quit_now){
1384
1609
}
1385
1610
written += (size_t)ret;
1386
1611
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1387
1622
retval = 0;
1388
1623
}
1389
1624
}
1402
1637
free(decrypted_buffer);
1403
1638
free(buffer);
1404
1639
if(tcp_sd >= 0){
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
1406
1641
}
1407
1642
if(ret == -1){
1408
1643
if(e == 0){
1420
1655
return retval;
1421
1656
}
1422
1657
1423
__attribute__((nonnull))
1424
1658
static void resolve_callback(AvahiSServiceResolver *r,
1425
1659
AvahiIfIndex interface,
1426
1660
AvahiProtocol proto,
1563
1797
__attribute__((nonnull, warn_unused_result))
1564
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
1799
int ret;
1566
error_t ret_errno;
1800
int old_errno;
1567
1801
1568
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
1803
if(s < 0){
1570
ret_errno = errno;
1804
old_errno = errno;
1571
1805
perror_plus("socket");
1572
errno = ret_errno;
1806
errno = old_errno;
1573
1807
return false;
1574
1808
}
1575
strcpy(ifr->ifr_name, ifname);
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1576
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
1812
if(ret == -1){
1578
1813
if(debug){
1579
ret_errno = errno;
1814
old_errno = errno;
1580
1815
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1582
1822
}
1583
1823
return false;
1584
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1585
1830
return true;
1586
1831
}
1587
1832
1848
2093
return;
1849
2094
}
1850
2095
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
1853
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
2102
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__ */
1863
2103
if(numhooks == -1){
1864
2104
perror_plus("scandir");
2105
close(devnull);
1865
2106
return;
1866
2107
}
1867
2108
struct dirent *direntry;
1868
2109
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
}
1874
2110
for(int i = 0; i < numhooks; i++){
1875
2111
direntry = direntries[i];
1876
2112
if(debug){
1947
2183
perror_plus("openat");
1948
2184
_exit(EXIT_FAILURE);
1949
2185
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2186
if(close(hookdir_fd) == -1){
1951
2187
perror_plus("close");
1952
2188
_exit(EXIT_FAILURE);
1953
2189
}
1956
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
2193
_exit(EX_OSERR);
1958
2194
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2195
ret = close(devnull);
1960
2196
if(ret == -1){
1961
2197
perror_plus("close");
1962
2198
_exit(EX_OSERR);
2011
2247
free(direntry);
2012
2248
}
2013
2249
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2250
if(close(hookdir_fd) == -1){
2015
2251
perror_plus("close");
2016
2252
} else {
2017
2253
hookdir_fd = -1;
2020
2256
}
2021
2257
2022
2258
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2026
2262
int ret;
2027
2263
struct ifreq network;
2028
2264
unsigned int if_index = if_nametoindex(interface);
2038
2274
}
2039
2275
2040
2276
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2042
2279
if(not get_flags(interface, &network)){
2043
2280
ret_errno = errno;
2044
2281
fprintf_plus(stderr, "Failed to get flags for interface "
2057
2294
}
2058
2295
2059
2296
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2297
ret = close(sd);
2061
2298
if(ret == -1){
2062
2299
perror_plus("close");
2063
2300
}
2113
2350
}
2114
2351
2115
2352
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2353
ret = close(sd);
2117
2354
if(ret == -1){
2118
2355
perror_plus("close");
2119
2356
}
2131
2368
2132
2369
/* Sleep checking until interface is running.
2133
2370
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2371
for(int i = 0; i < delay * 4; i++){
2135
2372
if(interface_is_running(interface)){
2136
2373
break;
2137
2374
}
2147
2384
}
2148
2385
2149
2386
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2152
2389
struct ifreq network;
2153
2390
unsigned int if_index = if_nametoindex(interface);
2154
2391
if(if_index == 0){
2157
2394
return ENXIO;
2158
2395
}
2159
2396
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2161
2399
if(not get_flags(interface, &network) and debug){
2162
2400
ret_errno = errno;
2163
2401
fprintf_plus(stderr, "Failed to get flags for interface "
2201
2439
}
2202
2440
2203
2441
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2442
int ret = close(sd);
2205
2443
if(ret == -1){
2206
2444
perror_plus("close");
2207
2445
}
2223
2461
2224
2462
int main(int argc, char *argv[]){
2225
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
2229
2476
AvahiSServiceBrowser *sb = NULL;
2230
2477
error_t ret_errno;
2231
2478
int ret;
2240
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
2488
const char *seckey = PATHDIR "/" SECKEY;
2242
2489
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
const char *dh_params_file = NULL;
2243
2495
char *interfaces_hooks = NULL;
2244
2496
2245
2497
bool gnutls_initialized = false;
2292
2544
{ .name = "pubkey", .key = 'p',
2293
2545
.arg = "FILE",
2294
2546
.doc = "OpenPGP public key file base name",
2295
.group = 2 },
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
2296
2564
{ .name = "dh-bits", .key = 129,
2297
2565
.arg = "BITS",
2298
2566
.doc = "Bit length of the prime number used in the"
2299
2567
" Diffie-Hellman key exchange",
2300
2568
.group = 2 },
2569
{ .name = "dh-params", .key = 134,
2570
.arg = "FILE",
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2573
.group = 2 },
2301
2574
{ .name = "priority", .key = 130,
2302
2575
.arg = "STRING",
2303
2576
.doc = "GnuTLS priority string for the TLS handshake",
2349
2622
case 'p': /* --pubkey */
2350
2623
pubkey = arg;
2351
2624
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
2352
2635
case 129: /* --dh-bits */
2353
2636
errno = 0;
2354
2637
tmpmax = strtoimax(arg, &tmp, 10);
2358
2641
}
2359
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2360
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2361
2647
case 130: /* --priority */
2362
2648
mc.priority = arg;
2363
2649
break;
2403
2689
.args_doc = "",
2404
2690
.doc = "Mandos client -- Get and decrypt"
2405
2691
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2692
ret_errno = argp_parse(&argp, argc, argv,
2693
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2694
switch(ret_errno){
2409
2695
case 0:
2410
2696
break;
2411
2697
case ENOMEM:
2412
2698
default:
2413
errno = ret;
2699
errno = ret_errno;
2414
2700
perror_plus("argp_parse");
2415
2701
exitcode = EX_OSERR;
2416
2702
goto end;
2422
2708
2423
2709
{
2424
2710
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2711
<https://bugs.debian.org/633582> */
2426
2712
2427
2713
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2714
ret = raise_privileges();
2715
if(ret != 0){
2716
errno = ret;
2431
2717
perror_plus("Failed to raise privileges");
2432
2718
} else {
2433
2719
struct stat st;
2449
2735
}
2450
2736
}
2451
2737
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2738
close(seckey_fd);
2453
2739
}
2454
2740
}
2455
2741
2470
2756
}
2471
2757
}
2472
2758
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2759
close(pubkey_fd);
2760
}
2761
}
2762
2763
if(dh_params_file != NULL
2764
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2765
int dhparams_fd = open(dh_params_file, O_RDONLY);
2766
if(dhparams_fd == -1){
2767
perror_plus("open");
2768
} else {
2769
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2770
if(ret == -1){
2771
perror_plus("fstat");
2772
} else {
2773
if(S_ISREG(st.st_mode)
2774
and st.st_uid == 0 and st.st_gid == 0){
2775
ret = fchown(dhparams_fd, uid, gid);
2776
if(ret == -1){
2777
perror_plus("fchown");
2778
}
2779
}
2780
}
2781
close(dhparams_fd);
2474
2782
}
2475
2783
}
2476
2784
2477
2785
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2786
ret = lower_privileges();
2787
if(ret != 0){
2788
errno = ret;
2481
2789
perror_plus("Failed to lower privileges");
2482
2790
}
2483
2791
}
2653
2961
errno = bring_up_interface(interface, delay);
2654
2962
if(not interface_was_up){
2655
2963
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2964
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2965
" %s\n", interface, strerror(errno));
2657
2966
} else {
2658
2967
errno = argz_add(&interfaces_to_take_down,
2659
2968
&interfaces_to_take_down_size,
2682
2991
goto end;
2683
2992
}
2684
2993
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2994
#if GNUTLS_VERSION_NUMBER >= 0x030606
2995
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2996
#elif GNUTLS_VERSION_NUMBER < 0x030600
2997
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2998
#else
2999
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3000
#endif
2686
3001
if(ret == -1){
2687
3002
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
3003
exitcode = EX_UNAVAILABLE;
2810
3125
2811
3126
/* Allocate a new server */
2812
3127
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
3128
&config, NULL, NULL, &ret);
2814
3129
2815
3130
/* Free the Avahi configuration data */
2816
3131
avahi_server_config_free(&config);
2819
3134
/* Check if creating the Avahi server object succeeded */
2820
3135
if(mc.server == NULL){
2821
3136
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
3137
avahi_strerror(ret));
2823
3138
exitcode = EX_UNAVAILABLE;
2824
3139
goto end;
2825
3140
}
2860
3175
end:
2861
3176
2862
3177
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3178
if(signal_received){
3179
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3180
argv[0], signal_received,
3181
strsignal(signal_received));
3182
} else {
3183
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3184
}
2864
3185
}
2865
3186
2866
3187
/* Cleanup things */
2877
3198
2878
3199
if(gnutls_initialized){
2879
3200
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
3201
gnutls_dh_params_deinit(mc.dh_params);
2882
3202
}
2883
3203
2906
3226
2907
3227
/* Re-raise privileges */
2908
3228
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3229
ret = raise_privileges();
3230
if(ret != 0){
3231
errno = ret;
2912
3232
perror_plus("Failed to raise privileges");
2913
3233
} else {
2914
3234
2919
3239
/* Take down the network interfaces which were brought up */
2920
3240
{
2921
3241
char *interface = NULL;
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;
3242
while((interface = argz_next(interfaces_to_take_down,
3243
interfaces_to_take_down_size,
3244
interface))){
3245
ret = take_down_interface(interface);
3246
if(ret != 0){
3247
errno = ret;
2928
3248
perror_plus("Failed to take down interface");
2929
3249
}
2930
3250
}
2935
3255
}
2936
3256
}
2937
3257
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3258
ret = lower_privileges_permanently();
3259
if(ret != 0){
3260
errno = ret;
2941
3261
perror_plus("Failed to lower privileges permanently");
2942
3262
}
2943
3263
}
2945
3265
free(interfaces_to_take_down);
2946
3266
free(interfaces_hooks);
2947
3267
3268
void clean_dir_at(int base, const char * const dirname,
3269
uintmax_t level){
3270
struct dirent **direntries = NULL;
3271
int dret;
3272
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3273
O_RDONLY
3274
| O_NOFOLLOW
3275
| O_DIRECTORY
3276
| O_PATH));
3277
if(dir_fd == -1){
3278
perror_plus("open");
3279
return;
3280
}
3281
int numentries = scandirat(dir_fd, ".", &direntries,
3282
notdotentries, alphasort);
3283
if(numentries >= 0){
3284
for(int i = 0; i < numentries; i++){
3285
if(debug){
3286
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3287
dirname, direntries[i]->d_name);
3288
}
3289
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3290
if(dret == -1){
3291
if(errno == EISDIR){
3292
dret = unlinkat(dir_fd, direntries[i]->d_name,
3293
AT_REMOVEDIR);
3294
}
3295
if((dret == -1) and (errno == ENOTEMPTY)
3296
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3297
== 0) and (level == 0)){
3298
/* Recurse only in this special case */
3299
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3300
dret = 0;
3301
}
3302
if((dret == -1) and (errno != ENOENT)){
3303
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3304
direntries[i]->d_name, strerror(errno));
3305
}
3306
}
3307
free(direntries[i]);
3308
}
3309
3310
/* need to clean even if 0 because man page doesn't specify */
3311
free(direntries);
3312
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3313
if(dret == -1 and errno != ENOENT){
3314
perror_plus("rmdir");
3315
}
3316
} else {
3317
perror_plus("scandirat");
3318
}
3319
close(dir_fd);
3320
}
3321
2948
3322
/* Removes the GPGME temp directory and all files inside */
2949
3323
if(tempdir != NULL){
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
}
3324
clean_dir_at(-1, tempdir, 0);
2993
3325
}
2994
3326
2995
3327
if(quit_now){
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Version: 2.0.2.dev0