qemu/crypto/tlscredsanon.c
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   1/*
   2 * QEMU crypto TLS anonymous credential support
   3 *
   4 * Copyright (c) 2015 Red Hat, Inc.
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2.1 of the License, or (at your option) any later version.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 *
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "crypto/tlscredsanon.h"
  23#include "tlscredspriv.h"
  24#include "qapi/error.h"
  25#include "qemu/module.h"
  26#include "qom/object_interfaces.h"
  27#include "trace.h"
  28
  29
  30#ifdef CONFIG_GNUTLS
  31
  32
  33static int
  34qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds,
  35                            Error **errp)
  36{
  37    g_autofree char *dhparams = NULL;
  38    int ret;
  39
  40    trace_qcrypto_tls_creds_anon_load(creds,
  41            creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
  42
  43    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
  44        if (qcrypto_tls_creds_get_path(&creds->parent_obj,
  45                                       QCRYPTO_TLS_CREDS_DH_PARAMS,
  46                                       false, &dhparams, errp) < 0) {
  47            return -1;
  48        }
  49
  50        ret = gnutls_anon_allocate_server_credentials(&creds->data.server);
  51        if (ret < 0) {
  52            error_setg(errp, "Cannot allocate credentials: %s",
  53                       gnutls_strerror(ret));
  54            return -1;
  55        }
  56
  57        if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
  58                                                 &creds->parent_obj.dh_params,
  59                                                 errp) < 0) {
  60            return -1;
  61        }
  62
  63        gnutls_anon_set_server_dh_params(creds->data.server,
  64                                         creds->parent_obj.dh_params);
  65    } else {
  66        ret = gnutls_anon_allocate_client_credentials(&creds->data.client);
  67        if (ret < 0) {
  68            error_setg(errp, "Cannot allocate credentials: %s",
  69                       gnutls_strerror(ret));
  70            return -1;
  71        }
  72    }
  73
  74    return 0;
  75}
  76
  77
  78static void
  79qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds)
  80{
  81    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
  82        if (creds->data.client) {
  83            gnutls_anon_free_client_credentials(creds->data.client);
  84            creds->data.client = NULL;
  85        }
  86    } else {
  87        if (creds->data.server) {
  88            gnutls_anon_free_server_credentials(creds->data.server);
  89            creds->data.server = NULL;
  90        }
  91    }
  92    if (creds->parent_obj.dh_params) {
  93        gnutls_dh_params_deinit(creds->parent_obj.dh_params);
  94        creds->parent_obj.dh_params = NULL;
  95    }
  96}
  97
  98#else /* ! CONFIG_GNUTLS */
  99
 100
 101static void
 102qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED,
 103                            Error **errp)
 104{
 105    error_setg(errp, "TLS credentials support requires GNUTLS");
 106}
 107
 108
 109static void
 110qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED)
 111{
 112    /* nada */
 113}
 114
 115
 116#endif /* ! CONFIG_GNUTLS */
 117
 118
 119static void
 120qcrypto_tls_creds_anon_prop_set_loaded(Object *obj,
 121                                       bool value,
 122                                       Error **errp)
 123{
 124    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 125
 126    if (value) {
 127        qcrypto_tls_creds_anon_load(creds, errp);
 128    } else {
 129        qcrypto_tls_creds_anon_unload(creds);
 130    }
 131}
 132
 133
 134#ifdef CONFIG_GNUTLS
 135
 136
 137static bool
 138qcrypto_tls_creds_anon_prop_get_loaded(Object *obj,
 139                                       Error **errp G_GNUC_UNUSED)
 140{
 141    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 142
 143    if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
 144        return creds->data.server != NULL;
 145    } else {
 146        return creds->data.client != NULL;
 147    }
 148}
 149
 150
 151#else /* ! CONFIG_GNUTLS */
 152
 153
 154static bool
 155qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED,
 156                                       Error **errp G_GNUC_UNUSED)
 157{
 158    return false;
 159}
 160
 161
 162#endif /* ! CONFIG_GNUTLS */
 163
 164
 165static void
 166qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp)
 167{
 168    object_property_set_bool(OBJECT(uc), "loaded", true, errp);
 169}
 170
 171
 172static void
 173qcrypto_tls_creds_anon_finalize(Object *obj)
 174{
 175    QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 176
 177    qcrypto_tls_creds_anon_unload(creds);
 178}
 179
 180
 181static void
 182qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data)
 183{
 184    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 185
 186    ucc->complete = qcrypto_tls_creds_anon_complete;
 187
 188    object_class_property_add_bool(oc, "loaded",
 189                                   qcrypto_tls_creds_anon_prop_get_loaded,
 190                                   qcrypto_tls_creds_anon_prop_set_loaded);
 191}
 192
 193
 194static const TypeInfo qcrypto_tls_creds_anon_info = {
 195    .parent = TYPE_QCRYPTO_TLS_CREDS,
 196    .name = TYPE_QCRYPTO_TLS_CREDS_ANON,
 197    .instance_size = sizeof(QCryptoTLSCredsAnon),
 198    .instance_finalize = qcrypto_tls_creds_anon_finalize,
 199    .class_size = sizeof(QCryptoTLSCredsAnonClass),
 200    .class_init = qcrypto_tls_creds_anon_class_init,
 201    .interfaces = (InterfaceInfo[]) {
 202        { TYPE_USER_CREATABLE },
 203        { }
 204    }
 205};
 206
 207
 208static void
 209qcrypto_tls_creds_anon_register_types(void)
 210{
 211    type_register_static(&qcrypto_tls_creds_anon_info);
 212}
 213
 214
 215type_init(qcrypto_tls_creds_anon_register_types);
 216