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Pre-Shared Keys (PSK) is a simpler mechanism for enabling TLS
connections than using certificates. It requires only a simple secret
key:
$ mkdir -m 0700 /tmp/keys
$ psktool -u rjones -p /tmp/keys/keys.psk
$ cat /tmp/keys/keys.psk
rjones:d543770c15ad93d76443fb56f501a31969235f47e999720ae8d2336f6a13fcbc
The key can be secretly shared between clients and servers. Clients
must specify the directory containing the "keys.psk" file and a
username (defaults to "qemu"). Servers must specify only the
directory.
Example NBD client:
$ qemu-img info \
--object tls-creds-psk,id=tls0,dir=/tmp/keys,username=rjones,endpoint=client \
--image-opts \
file.driver=nbd,file.host=localhost,file.port=10809,file.tls-creds=tls0,file.export=/
Example NBD server using qemu-nbd:
$ qemu-nbd -t -x / \
--object tls-creds-psk,id=tls0,endpoint=server,dir=/tmp/keys \
--tls-creds tls0 \
image.qcow2
Example NBD server using nbdkit:
$ nbdkit -n -e / -fv \
--tls=on --tls-psk=/tmp/keys/keys.psk \
file file=disk.img
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/*
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* QEMU crypto TLS Pre-Shared Key (PSK) support
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*
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* Copyright (c) 2018 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QCRYPTO_TLSCREDSPSK_H
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#define QCRYPTO_TLSCREDSPSK_H
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#include "crypto/tlscreds.h"
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#define TYPE_QCRYPTO_TLS_CREDS_PSK "tls-creds-psk"
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#define QCRYPTO_TLS_CREDS_PSK(obj) \
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OBJECT_CHECK(QCryptoTLSCredsPSK, (obj), TYPE_QCRYPTO_TLS_CREDS_PSK)
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typedef struct QCryptoTLSCredsPSK QCryptoTLSCredsPSK;
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typedef struct QCryptoTLSCredsPSKClass QCryptoTLSCredsPSKClass;
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#define QCRYPTO_TLS_CREDS_PSKFILE "keys.psk"
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/**
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* QCryptoTLSCredsPSK:
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*
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* The QCryptoTLSCredsPSK object provides a representation
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* of the Pre-Shared Key credential used to perform a TLS handshake.
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*
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* This is a user creatable object, which can be instantiated
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* via object_new_propv():
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*
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* <example>
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* <title>Creating TLS-PSK credential objects in code</title>
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* <programlisting>
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* Object *obj;
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* Error *err = NULL;
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* obj = object_new_propv(TYPE_QCRYPTO_TLS_CREDS_PSK,
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* "tlscreds0",
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* &err,
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* "dir", "/path/to/dir",
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* "endpoint", "client",
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* NULL);
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* </programlisting>
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* </example>
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*
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* Or via QMP:
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*
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* <example>
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* <title>Creating TLS-PSK credential objects via QMP</title>
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* <programlisting>
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* {
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* "execute": "object-add", "arguments": {
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* "id": "tlscreds0",
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* "qom-type": "tls-creds-psk",
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* "props": {
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* "dir": "/path/to/dir",
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* "endpoint": "client"
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* }
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* }
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* }
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* </programlisting>
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* </example>
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*
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* Or via the CLI:
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*
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* <example>
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* <title>Creating TLS-PSK credential objects via CLI</title>
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* <programlisting>
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* qemu-system-x86_64 --object tls-creds-psk,id=tlscreds0,\
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* endpoint=client,dir=/path/to/dir[,username=qemu]
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* </programlisting>
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* </example>
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*
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* The PSK file can be created and managed using psktool.
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*/
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struct QCryptoTLSCredsPSK {
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QCryptoTLSCreds parent_obj;
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char *username;
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#ifdef CONFIG_GNUTLS
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union {
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gnutls_psk_server_credentials_t server;
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gnutls_psk_client_credentials_t client;
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} data;
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#endif
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};
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struct QCryptoTLSCredsPSKClass {
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QCryptoTLSCredsClass parent_class;
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};
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#endif /* QCRYPTO_TLSCREDSPSK_H */
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