crypto/tlscredsanon.c

   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
  33 static int
  34 qcrypto_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
  78 static void
  79 qcrypto_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
 101 static void
 102 qcrypto_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
 109 static void
 110 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED)
 111 {
 112     /* nada */
 113 }
 114
 115
 116 #endif /* ! CONFIG_GNUTLS */
 117
 118
 119 static void
 120 qcrypto_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
 137 static bool
 138 qcrypto_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
 154 static bool
 155 qcrypto_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
 165 static void
 166 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp)
 167 {
 168     object_property_set_bool(OBJECT(uc), true, "loaded", errp);
 169 }
 170
 171
 172 static void
 173 qcrypto_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
 181 static void
 182 qcrypto_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
 194 static 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
 208 static void
 209 qcrypto_tls_creds_anon_register_types(void)
 210 {
 211     type_register_static(&qcrypto_tls_creds_anon_info);
 212 }
 213
 214
 215 type_init(qcrypto_tls_creds_anon_register_types);