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 "qom/object_interfaces.h" 26 #include "trace.h" 27 28 29 #ifdef CONFIG_GNUTLS 30 31 32 static int 33 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds, 34 Error **errp) 35 { 36 char *dhparams = NULL; 37 int ret; 38 int rv = -1; 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 goto cleanup; 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 goto cleanup; 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 goto cleanup; 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 goto cleanup; 71 } 72 } 73 74 rv = 0; 75 cleanup: 76 g_free(dhparams); 77 return rv; 78 } 79 80 81 static void 82 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds) 83 { 84 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { 85 if (creds->data.client) { 86 gnutls_anon_free_client_credentials(creds->data.client); 87 creds->data.client = NULL; 88 } 89 } else { 90 if (creds->data.server) { 91 gnutls_anon_free_server_credentials(creds->data.server); 92 creds->data.server = NULL; 93 } 94 } 95 if (creds->parent_obj.dh_params) { 96 gnutls_dh_params_deinit(creds->parent_obj.dh_params); 97 creds->parent_obj.dh_params = NULL; 98 } 99 } 100 101 #else /* ! CONFIG_GNUTLS */ 102 103 104 static void 105 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED, 106 Error **errp) 107 { 108 error_setg(errp, "TLS credentials support requires GNUTLS"); 109 } 110 111 112 static void 113 qcrypto_tls_creds_anon_unload(QCryptoTLSCredsAnon *creds G_GNUC_UNUSED) 114 { 115 /* nada */ 116 } 117 118 119 #endif /* ! CONFIG_GNUTLS */ 120 121 122 static void 123 qcrypto_tls_creds_anon_prop_set_loaded(Object *obj, 124 bool value, 125 Error **errp) 126 { 127 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 128 129 if (value) { 130 qcrypto_tls_creds_anon_load(creds, errp); 131 } else { 132 qcrypto_tls_creds_anon_unload(creds); 133 } 134 } 135 136 137 #ifdef CONFIG_GNUTLS 138 139 140 static bool 141 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj, 142 Error **errp G_GNUC_UNUSED) 143 { 144 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 145 146 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 147 return creds->data.server != NULL; 148 } else { 149 return creds->data.client != NULL; 150 } 151 } 152 153 154 #else /* ! CONFIG_GNUTLS */ 155 156 157 static bool 158 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED, 159 Error **errp G_GNUC_UNUSED) 160 { 161 return false; 162 } 163 164 165 #endif /* ! CONFIG_GNUTLS */ 166 167 168 static void 169 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp) 170 { 171 object_property_set_bool(OBJECT(uc), true, "loaded", errp); 172 } 173 174 175 static void 176 qcrypto_tls_creds_anon_finalize(Object *obj) 177 { 178 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 179 180 qcrypto_tls_creds_anon_unload(creds); 181 } 182 183 184 static void 185 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data) 186 { 187 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 188 189 ucc->complete = qcrypto_tls_creds_anon_complete; 190 191 object_class_property_add_bool(oc, "loaded", 192 qcrypto_tls_creds_anon_prop_get_loaded, 193 qcrypto_tls_creds_anon_prop_set_loaded, 194 NULL); 195 } 196 197 198 static const TypeInfo qcrypto_tls_creds_anon_info = { 199 .parent = TYPE_QCRYPTO_TLS_CREDS, 200 .name = TYPE_QCRYPTO_TLS_CREDS_ANON, 201 .instance_size = sizeof(QCryptoTLSCredsAnon), 202 .instance_finalize = qcrypto_tls_creds_anon_finalize, 203 .class_size = sizeof(QCryptoTLSCredsAnonClass), 204 .class_init = qcrypto_tls_creds_anon_class_init, 205 .interfaces = (InterfaceInfo[]) { 206 { TYPE_USER_CREATABLE }, 207 { } 208 } 209 }; 210 211 212 static void 213 qcrypto_tls_creds_anon_register_types(void) 214 { 215 type_register_static(&qcrypto_tls_creds_anon_info); 216 } 217 218 219 type_init(qcrypto_tls_creds_anon_register_types); 220