qemu

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/*
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 * QEMU crypto TLS anonymous credential support
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 *
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 * Copyright (c) 2015 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 2.1 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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#include "qemu/osdep.h"
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#include "crypto/tlscredsanon.h"
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#include "tlscredspriv.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "qom/object_interfaces.h"
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#include "trace.h"
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#ifdef CONFIG_GNUTLS
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#include <gnutls/gnutls.h>
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static int
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qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds,
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                            Error **errp)
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{
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    g_autofree char *dhparams = NULL;
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    int ret;
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    trace_qcrypto_tls_creds_anon_load(creds,
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            creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
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    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
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        if (qcrypto_tls_creds_get_path(&creds->parent_obj,
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                                       QCRYPTO_TLS_CREDS_DH_PARAMS,
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                                       false, &dhparams, errp) < 0) {
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            return -1;
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        }
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        ret = gnutls_anon_allocate_server_credentials(&creds->data.server);
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        if (ret < 0) {
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            error_setg(errp, "Cannot allocate credentials: %s",
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                       gnutls_strerror(ret));
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            return -1;
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        }
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        if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
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                                                 &creds->parent_obj.dh_params,
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                                                 errp) < 0) {
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            return -1;
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        }
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        gnutls_anon_set_server_dh_params(creds->data.server,
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                                         creds->parent_obj.dh_params);
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    } else {
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        ret = gnutls_anon_allocate_client_credentials(&creds->data.client);
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        if (ret < 0) {
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            error_setg(errp, "Cannot allocate credentials: %s",
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                       gnutls_strerror(ret));
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            return -1;
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        }
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    }
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    return 0;
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}
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static void
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qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds)
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{
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    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
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        if (creds->data.client) {
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            gnutls_anon_free_client_credentials(creds->data.client);
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            creds->data.client = NULL;
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        }
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    } else {
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        if (creds->data.server) {
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            gnutls_anon_free_server_credentials(creds->data.server);
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            creds->data.server = NULL;
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        }
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    }
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    if (creds->parent_obj.dh_params) {
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        gnutls_dh_params_deinit(creds->parent_obj.dh_params);
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        creds->parent_obj.dh_params = NULL;
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    }
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}
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#else /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED,
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                            Error **errp)
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{
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    error_setg(errp, "TLS credentials support requires GNUTLS");
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}
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static void
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qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED)
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{
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    /* nada */
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}
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#endif /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp)
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{
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    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(uc);
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    qcrypto_tls_creds_anon_load(creds, errp);
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}
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#ifdef CONFIG_GNUTLS
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static bool
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qcrypto_tls_creds_anon_prop_get_loaded(Object *obj,
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                                       Error **errp G_GNUC_UNUSED)
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{
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    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
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    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
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        return creds->data.server != NULL;
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    } else {
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        return creds->data.client != NULL;
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    }
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}
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#else /* ! CONFIG_GNUTLS */
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static bool
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qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED,
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                                       Error **errp G_GNUC_UNUSED)
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{
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    return false;
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}
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#endif /* ! CONFIG_GNUTLS */
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static void
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qcrypto_tls_creds_anon_finalize(Object *obj)
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{
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    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
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    qcrypto_tls_creds_anon_unload(creds);
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}
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static void
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qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data)
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{
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    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
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    ucc->complete = qcrypto_tls_creds_anon_complete;
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    object_class_property_add_bool(oc, "loaded",
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                                   qcrypto_tls_creds_anon_prop_get_loaded,
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                                   NULL);
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}
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static const TypeInfo qcrypto_tls_creds_anon_info = {
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    .parent = TYPE_QCRYPTO_TLS_CREDS,
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    .name = TYPE_QCRYPTO_TLS_CREDS_ANON,
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    .instance_size = sizeof(QCryptoTLSCredsAnon),
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    .instance_finalize = qcrypto_tls_creds_anon_finalize,
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    .class_size = sizeof(QCryptoTLSCredsAnonClass),
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    .class_init = qcrypto_tls_creds_anon_class_init,
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    .interfaces = (InterfaceInfo[]) {
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        { TYPE_USER_CREATABLE },
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        { }
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    }
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};
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static void
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qcrypto_tls_creds_anon_register_types(void)
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{
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    type_register_static(&qcrypto_tls_creds_anon_info);
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}
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type_init(qcrypto_tls_creds_anon_register_types);
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