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 #include <gnutls/gnutls.h> 33 34 35 static int 36 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds, 37 Error **errp) 38 { 39 g_autofree char *dhparams = NULL; 40 int ret; 41 42 trace_qcrypto_tls_creds_anon_load(creds, 43 creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>"); 44 45 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 46 if (qcrypto_tls_creds_get_path(&creds->parent_obj, 47 QCRYPTO_TLS_CREDS_DH_PARAMS, 48 false, &dhparams, errp) < 0) { 49 return -1; 50 } 51 52 ret = gnutls_anon_allocate_server_credentials(&creds->data.server); 53 if (ret < 0) { 54 error_setg(errp, "Cannot allocate credentials: %s", 55 gnutls_strerror(ret)); 56 return -1; 57 } 58 59 if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams, 60 &creds->parent_obj.dh_params, 61 errp) < 0) { 62 return -1; 63 } 64 65 gnutls_anon_set_server_dh_params(creds->data.server, 66 creds->parent_obj.dh_params); 67 } else { 68 ret = gnutls_anon_allocate_client_credentials(&creds->data.client); 69 if (ret < 0) { 70 error_setg(errp, "Cannot allocate credentials: %s", 71 gnutls_strerror(ret)); 72 return -1; 73 } 74 } 75 76 return 0; 77 } 78 79 80 static void 81 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds) 82 { 83 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { 84 if (creds->data.client) { 85 gnutls_anon_free_client_credentials(creds->data.client); 86 creds->data.client = NULL; 87 } 88 } else { 89 if (creds->data.server) { 90 gnutls_anon_free_server_credentials(creds->data.server); 91 creds->data.server = NULL; 92 } 93 } 94 if (creds->parent_obj.dh_params) { 95 gnutls_dh_params_deinit(creds->parent_obj.dh_params); 96 creds->parent_obj.dh_params = NULL; 97 } 98 } 99 100 #else /* ! CONFIG_GNUTLS */ 101 102 103 static void 104 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED, 105 Error **errp) 106 { 107 error_setg(errp, "TLS credentials support requires GNUTLS"); 108 } 109 110 111 static void 112 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED) 113 { 114 /* nada */ 115 } 116 117 118 #endif /* ! CONFIG_GNUTLS */ 119 120 121 static void 122 qcrypto_tls_creds_anon_prop_set_loaded(Object *obj, 123 bool value, 124 Error **errp) 125 { 126 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 127 128 qcrypto_tls_creds_anon_unload(creds); 129 if (value) { 130 qcrypto_tls_creds_anon_load(creds, errp); 131 } 132 } 133 134 135 #ifdef CONFIG_GNUTLS 136 137 138 static bool 139 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj, 140 Error **errp G_GNUC_UNUSED) 141 { 142 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 143 144 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 145 return creds->data.server != NULL; 146 } else { 147 return creds->data.client != NULL; 148 } 149 } 150 151 152 #else /* ! CONFIG_GNUTLS */ 153 154 155 static bool 156 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED, 157 Error **errp G_GNUC_UNUSED) 158 { 159 return false; 160 } 161 162 163 #endif /* ! CONFIG_GNUTLS */ 164 165 166 static void 167 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp) 168 { 169 object_property_set_bool(OBJECT(uc), "loaded", true, errp); 170 } 171 172 173 static void 174 qcrypto_tls_creds_anon_finalize(Object *obj) 175 { 176 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 177 178 qcrypto_tls_creds_anon_unload(creds); 179 } 180 181 182 static void 183 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data) 184 { 185 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 186 187 ucc->complete = qcrypto_tls_creds_anon_complete; 188 189 object_class_property_add_bool(oc, "loaded", 190 qcrypto_tls_creds_anon_prop_get_loaded, 191 qcrypto_tls_creds_anon_prop_set_loaded); 192 } 193 194 195 static const TypeInfo qcrypto_tls_creds_anon_info = { 196 .parent = TYPE_QCRYPTO_TLS_CREDS, 197 .name = TYPE_QCRYPTO_TLS_CREDS_ANON, 198 .instance_size = sizeof(QCryptoTLSCredsAnon), 199 .instance_finalize = qcrypto_tls_creds_anon_finalize, 200 .class_size = sizeof(QCryptoTLSCredsAnonClass), 201 .class_init = qcrypto_tls_creds_anon_class_init, 202 .interfaces = (InterfaceInfo[]) { 203 { TYPE_USER_CREATABLE }, 204 { } 205 } 206 }; 207 208 209 static void 210 qcrypto_tls_creds_anon_register_types(void) 211 { 212 type_register_static(&qcrypto_tls_creds_anon_info); 213 } 214 215 216 type_init(qcrypto_tls_creds_anon_register_types); 217