993aec27aa
On the host OS, various aspects of TLS operation are configurable. In particular it is possible for the sysadmin to control the TLS cipher/protocol algorithms that applications are permitted to use. * Any given crypto library has a built-in default priority list defined by the distro maintainer of the library package (or by upstream). * The "crypto-policies" RPM (or equivalent host OS package) provides a config file such as "/etc/crypto-policies/config", where the sysadmin can set a high level (library-independent) policy. The "update-crypto-policies --set" command (or equivalent) is used to translate the global policy to individual library representations, producing files such as "/etc/crypto-policies/back-ends/*.config". The generated files, if present, are loaded by the various crypto libraries to override their own built-in defaults. For example, the GNUTLS library may read "/etc/crypto-policies/back-ends/gnutls.config". * A management application (or the QEMU user) may overide the system-wide crypto-policies config via their own config, if they need to diverge from the former. Thus the priority order is "QEMU user config" > "crypto-policies system config" > "library built-in config". Introduce the "tls-cipher-suites" object for exposing the ordered list of permitted TLS cipher suites from the host side to the guest firmware, via fw_cfg. The list is represented as an array of bytes. The priority at which the host-side policy is retrieved is given by the "priority" property of the new object type. For example, "priority=@SYSTEM" may be used to refer to "/etc/crypto-policies/back-ends/gnutls.config" (given that QEMU uses GNUTLS). The firmware uses the IANA_TLS_CIPHER array for configuring guest-side TLS, for example in UEFI HTTPS Boot. [Description from Daniel P. Berrangé, edited by Laszlo Ersek.] Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20200623172726.21040-2-philmd@redhat.com>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
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* QEMU TLS Cipher Suites Registry (RFC8447)
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*
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* Copyright (c) 2018-2020 Red Hat, Inc.
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*
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* Author: Philippe Mathieu-Daudé <philmd@redhat.com>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef QCRYPTO_TLSCIPHERSUITES_H
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#define QCRYPTO_TLSCIPHERSUITES_H
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#include "qom/object.h"
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#include "crypto/tlscreds.h"
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#define TYPE_QCRYPTO_TLS_CIPHER_SUITES "tls-cipher-suites"
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#define QCRYPTO_TLS_CIPHER_SUITES(obj) \
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OBJECT_CHECK(QCryptoTLSCipherSuites, (obj), TYPE_QCRYPTO_TLS_CIPHER_SUITES)
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typedef struct QCryptoTLSCipherSuites {
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/* <private> */
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QCryptoTLSCreds parent_obj;
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/* <public> */
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} QCryptoTLSCipherSuites;
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/**
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* qcrypto_tls_cipher_suites_get_data:
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* @obj: pointer to a TLS cipher suites object
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* @errp: pointer to a NULL-initialized error object
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*
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* Returns: reference to a byte array containing the data.
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* The caller should release the reference when no longer
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* required.
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*/
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GByteArray *qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites *obj,
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Error **errp);
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#endif /* QCRYPTO_TLSCIPHERSUITES_H */
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