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 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     char *dhparams = NULL;
  38     int ret;
  39     int rv = -1;
  40
  41     trace_qcrypto_tls_creds_anon_load(creds,
  42             creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
  43
  44     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
  45         if (qcrypto_tls_creds_get_path(&creds->parent_obj,
  46                                        QCRYPTO_TLS_CREDS_DH_PARAMS,
  47                                        false, &dhparams, errp) < 0) {
  48             goto cleanup;
  49         }
  50
  51         ret = gnutls_anon_allocate_server_credentials(&creds->data.server);
  52         if (ret < 0) {
  53             error_setg(errp, "Cannot allocate credentials: %s",
  54                        gnutls_strerror(ret));
  55             goto cleanup;
  56         }
  57
  58         if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
  59                                                  &creds->parent_obj.dh_params,
  60                                                  errp) < 0) {
  61             goto cleanup;
  62         }
  63
  64         gnutls_anon_set_server_dh_params(creds->data.server,
  65                                          creds->parent_obj.dh_params);
  66     } else {
  67         ret = gnutls_anon_allocate_client_credentials(&creds->data.client);
  68         if (ret < 0) {
  69             error_setg(errp, "Cannot allocate credentials: %s",
  70                        gnutls_strerror(ret));
  71             goto cleanup;
  72         }
  73     }
  74
  75     rv = 0;
  76  cleanup:
  77     g_free(dhparams);
  78     return rv;
  79 }
  80
  81
  82 static void
  83 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds)
  84 {
  85     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
  86         if (creds->data.client) {
  87             gnutls_anon_free_client_credentials(creds->data.client);
  88             creds->data.client = NULL;
  89         }
  90     } else {
  91         if (creds->data.server) {
  92             gnutls_anon_free_server_credentials(creds->data.server);
  93             creds->data.server = NULL;
  94         }
  95     }
  96     if (creds->parent_obj.dh_params) {
  97         gnutls_dh_params_deinit(creds->parent_obj.dh_params);
  98         creds->parent_obj.dh_params = NULL;
  99     }
 100 }
 101
 102 #else /* ! CONFIG_GNUTLS */
 103
 104
 105 static void
 106 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED,
 107                             Error **errp)
 108 {
 109     error_setg(errp, "TLS credentials support requires GNUTLS");
 110 }
 111
 112
 113 static void
 114 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED)
 115 {
 116     /* nada */
 117 }
 118
 119
 120 #endif /* ! CONFIG_GNUTLS */
 121
 122
 123 static void
 124 qcrypto_tls_creds_anon_prop_set_loaded(Object *obj,
 125                                        bool value,
 126                                        Error **errp)
 127 {
 128     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 129
 130     if (value) {
 131         qcrypto_tls_creds_anon_load(creds, errp);
 132     } else {
 133         qcrypto_tls_creds_anon_unload(creds);
 134     }
 135 }
 136
 137
 138 #ifdef CONFIG_GNUTLS
 139
 140
 141 static bool
 142 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj,
 143                                        Error **errp G_GNUC_UNUSED)
 144 {
 145     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 146
 147     if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
 148         return creds->data.server != NULL;
 149     } else {
 150         return creds->data.client != NULL;
 151     }
 152 }
 153
 154
 155 #else /* ! CONFIG_GNUTLS */
 156
 157
 158 static bool
 159 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED,
 160                                        Error **errp G_GNUC_UNUSED)
 161 {
 162     return false;
 163 }
 164
 165
 166 #endif /* ! CONFIG_GNUTLS */
 167
 168
 169 static void
 170 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp)
 171 {
 172     object_property_set_bool(OBJECT(uc), true, "loaded", errp);
 173 }
 174
 175
 176 static void
 177 qcrypto_tls_creds_anon_finalize(Object *obj)
 178 {
 179     QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj);
 180
 181     qcrypto_tls_creds_anon_unload(creds);
 182 }
 183
 184
 185 static void
 186 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data)
 187 {
 188     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 189
 190     ucc->complete = qcrypto_tls_creds_anon_complete;
 191
 192     object_class_property_add_bool(oc, "loaded",
 193                                    qcrypto_tls_creds_anon_prop_get_loaded,
 194                                    qcrypto_tls_creds_anon_prop_set_loaded,
 195                                    NULL);
 196 }
 197
 198
 199 static const TypeInfo qcrypto_tls_creds_anon_info = {
 200     .parent = TYPE_QCRYPTO_TLS_CREDS,
 201     .name = TYPE_QCRYPTO_TLS_CREDS_ANON,
 202     .instance_size = sizeof(QCryptoTLSCredsAnon),
 203     .instance_finalize = qcrypto_tls_creds_anon_finalize,
 204     .class_size = sizeof(QCryptoTLSCredsAnonClass),
 205     .class_init = qcrypto_tls_creds_anon_class_init,
 206     .interfaces = (InterfaceInfo[]) {
 207         { TYPE_USER_CREATABLE },
 208         { }
 209     }
 210 };
 211
 212
 213 static void
 214 qcrypto_tls_creds_anon_register_types(void)
 215 {
 216     type_register_static(&qcrypto_tls_creds_anon_info);
 217 }
 218
 219
 220 type_init(qcrypto_tls_creds_anon_register_types);