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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1761835803; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1U4pzjNfu8oJgRpaD00KUGO9poOiqlcj3lvTJn8MMAQ=; b=Aa+CFuAxyt3IOA4PAkDf9V+sLn/W+dIx9BjWo03dsq3tV6zaPRfSrFLozP+otKxnx3b5Zu 94YXhpXQJn+ABYupekKRVys/rX5Z949Bo7Dl27aM+oqNLjjv6qmaDxNObi/5QeMYsCaKFa hMRtq03m5p6tdMahUxQ9Ay5YOwv+Z3U= X-MC-Unique: i34hIp8eP36gxRs9Z26gvA-1 X-Mimecast-MFC-AGG-ID: i34hIp8eP36gxRs9Z26gvA_1761835801 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , devel@lists.libvirt.org Subject: [PATCH 16/21] crypto: deprecate use of external dh-params.pem file Date: Thu, 30 Oct 2025 14:49:22 +0000 Message-ID: <20251030144927.2241109-17-berrange@redhat.com> In-Reply-To: <20251030144927.2241109-1-berrange@redhat.com> References: <20251030144927.2241109-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1761835929018154100 GNUTLS has deprecated use of externally provided diffie-hellman parameters, since it will automatically negotiate DH params in accordance with RFC7919. Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Marc-Andr=C3=A9 Lureau --- crypto/tlscreds.c | 24 ++++++++---------------- crypto/tlscredsanon.c | 6 ++++-- crypto/tlscredspsk.c | 6 ++++-- crypto/tlscredsx509.c | 4 +++- docs/about/deprecated.rst | 9 +++++++++ docs/system/tls.rst | 12 +++++++----- 6 files changed, 35 insertions(+), 26 deletions(-) diff --git a/crypto/tlscreds.c b/crypto/tlscreds.c index 798c9712fb..85268f3b57 100644 --- a/crypto/tlscreds.c +++ b/crypto/tlscreds.c @@ -22,6 +22,7 @@ #include "qapi/error.h" #include "qapi-types-crypto.h" #include "qemu/module.h" +#include "qemu/error-report.h" #include "tlscredspriv.h" #include "trace.h" =20 @@ -38,22 +39,7 @@ qcrypto_tls_creds_get_dh_params_file(QCryptoTLSCreds *cr= eds, =20 trace_qcrypto_tls_creds_load_dh(creds, filename ? filename : ""); =20 - if (filename =3D=3D NULL) { - ret =3D gnutls_dh_params_init(dh_params); - if (ret < 0) { - error_setg(errp, "Unable to initialize DH parameters: %s", - gnutls_strerror(ret)); - return -1; - } - ret =3D gnutls_dh_params_generate2(*dh_params, DH_BITS); - if (ret < 0) { - gnutls_dh_params_deinit(*dh_params); - *dh_params =3D NULL; - error_setg(errp, "Unable to generate DH parameters: %s", - gnutls_strerror(ret)); - return -1; - } - } else { + if (filename !=3D NULL) { GError *gerr =3D NULL; gchar *contents; gsize len; @@ -67,6 +53,10 @@ qcrypto_tls_creds_get_dh_params_file(QCryptoTLSCreds *cr= eds, g_error_free(gerr); return -1; } + warn_report_once("Use of an external DH parameters file '%s' is " + "deprecated and will be removed in a future relea= se", + filename); + data.data =3D (unsigned char *)contents; data.size =3D len; ret =3D gnutls_dh_params_init(dh_params); @@ -87,6 +77,8 @@ qcrypto_tls_creds_get_dh_params_file(QCryptoTLSCreds *cre= ds, filename, gnutls_strerror(ret)); return -1; } + } else { + *dh_params =3D NULL; } =20 return 0; diff --git a/crypto/tlscredsanon.c b/crypto/tlscredsanon.c index 69ed1d792a..777cc4f5bb 100644 --- a/crypto/tlscredsanon.c +++ b/crypto/tlscredsanon.c @@ -68,8 +68,10 @@ qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds, return -1; } =20 - gnutls_anon_set_server_dh_params(box->data.anonserver, - box->dh_params); + if (box->dh_params) { + gnutls_anon_set_server_dh_params(box->data.anonserver, + box->dh_params); + } } else { ret =3D gnutls_anon_allocate_client_credentials(&box->data.anoncli= ent); if (ret < 0) { diff --git a/crypto/tlscredspsk.c b/crypto/tlscredspsk.c index e437985260..801da50625 100644 --- a/crypto/tlscredspsk.c +++ b/crypto/tlscredspsk.c @@ -129,8 +129,10 @@ qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds, gnutls_strerror(ret)); goto cleanup; } - gnutls_psk_set_server_dh_params(box->data.pskserver, - box->dh_params); + if (box->dh_params) { + gnutls_psk_set_server_dh_params(box->data.pskserver, + box->dh_params); + } } else { box =3D qcrypto_tls_creds_box_new_client(GNUTLS_CRD_PSK); =20 diff --git a/crypto/tlscredsx509.c b/crypto/tlscredsx509.c index 2fc0872627..7e79af4266 100644 --- a/crypto/tlscredsx509.c +++ b/crypto/tlscredsx509.c @@ -684,7 +684,9 @@ qcrypto_tls_creds_x509_load(QCryptoTLSCredsX509 *creds, errp) < 0) { return -1; } - gnutls_certificate_set_dh_params(box->data.cert, box->dh_params); + if (box->dh_params) { + gnutls_certificate_set_dh_params(box->data.cert, box->dh_param= s); + } } creds->parent_obj.box =3D g_steal_pointer(&box); =20 diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index ca6b3769b5..694a69da64 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -365,6 +365,15 @@ Options are: - move backing file to NVDIMM storage and keep ``pmem=3Don`` (to have NVDIMM with persistence guaranties). =20 +Using an external DH (Diffie-Hellman) parameters file (since 10.2) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +Loading of external Diffie-Hellman parameters from a 'dh-params.pem' +file is deprecated and will be removed with no replacement in a +future release. Where no 'dh-params.pem' file is provided, the DH +parameters will be automatically negotiated in accordance with +RFC7919. + Device options -------------- =20 diff --git a/docs/system/tls.rst b/docs/system/tls.rst index a4f6781d62..44c4bf04e9 100644 --- a/docs/system/tls.rst +++ b/docs/system/tls.rst @@ -251,11 +251,13 @@ When specifying the object, the ``dir`` parameters sp= ecifies which directory contains the credential files. This directory is expected to contain files with the names mentioned previously, ``ca-cert.pem``, ``server-key.pem``, ``server-cert.pem``, ``client-key.pem`` and -``client-cert.pem`` as appropriate. It is also possible to include a set -of pre-generated Diffie-Hellman (DH) parameters in a file -``dh-params.pem``, which can be created using the -``certtool --generate-dh-params`` command. If omitted, QEMU will -dynamically generate DH parameters when loading the credentials. +``client-cert.pem`` as appropriate. + +While it is possible to include a set of pre-generated Diffie-Hellman +(DH) parameters in a file ``dh-params.pem``, this facility is now +deprecated and will be removed in a future release. When omitted the +DH parameters will be automatically negotiated in accordance with +RFC7919. =20 The ``endpoint`` parameter indicates whether the credentials will be used for a network client or server, and determines which PEM files are --=20 2.51.1