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 NULL); 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