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 "crypto/tlscredspriv.h" 24 #include "qom/object_interfaces.h" 25 #include "trace.h" 26 27 28 #ifdef CONFIG_GNUTLS 29 30 31 static int 32 qcrypto_tls_creds_anon_load(QCryptoTLSCredsAnon *creds, 33 Error **errp) 34 { 35 char *dhparams = NULL; 36 int ret; 37 int rv = -1; 38 39 trace_qcrypto_tls_creds_anon_load(creds, 40 creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>"); 41 42 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 43 if (qcrypto_tls_creds_get_path(&creds->parent_obj, 44 QCRYPTO_TLS_CREDS_DH_PARAMS, 45 false, &dhparams, errp) < 0) { 46 goto cleanup; 47 } 48 49 ret = gnutls_anon_allocate_server_credentials(&creds->data.server); 50 if (ret < 0) { 51 error_setg(errp, "Cannot allocate credentials: %s", 52 gnutls_strerror(ret)); 53 goto cleanup; 54 } 55 56 if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams, 57 &creds->parent_obj.dh_params, 58 errp) < 0) { 59 goto cleanup; 60 } 61 62 gnutls_anon_set_server_dh_params(creds->data.server, 63 creds->parent_obj.dh_params); 64 } else { 65 ret = gnutls_anon_allocate_client_credentials(&creds->data.client); 66 if (ret < 0) { 67 error_setg(errp, "Cannot allocate credentials: %s", 68 gnutls_strerror(ret)); 69 goto cleanup; 70 } 71 } 72 73 rv = 0; 74 cleanup: 75 g_free(dhparams); 76 return rv; 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 if (value) { 129 qcrypto_tls_creds_anon_load(creds, errp); 130 } else { 131 qcrypto_tls_creds_anon_unload(creds); 132 } 133 } 134 135 136 #ifdef CONFIG_GNUTLS 137 138 139 static bool 140 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj, 141 Error **errp G_GNUC_UNUSED) 142 { 143 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 144 145 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 146 return creds->data.server != NULL; 147 } else { 148 return creds->data.client != NULL; 149 } 150 } 151 152 153 #else /* ! CONFIG_GNUTLS */ 154 155 156 static bool 157 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED, 158 Error **errp G_GNUC_UNUSED) 159 { 160 return false; 161 } 162 163 164 #endif /* ! CONFIG_GNUTLS */ 165 166 167 static void 168 qcrypto_tls_creds_anon_complete(UserCreatable *uc, Error **errp) 169 { 170 object_property_set_bool(OBJECT(uc), true, "loaded", errp); 171 } 172 173 174 static void 175 qcrypto_tls_creds_anon_finalize(Object *obj) 176 { 177 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 178 179 qcrypto_tls_creds_anon_unload(creds); 180 } 181 182 183 static void 184 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data) 185 { 186 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 187 188 ucc->complete = qcrypto_tls_creds_anon_complete; 189 190 object_class_property_add_bool(oc, "loaded", 191 qcrypto_tls_creds_anon_prop_get_loaded, 192 qcrypto_tls_creds_anon_prop_set_loaded, 193 NULL); 194 } 195 196 197 static const TypeInfo qcrypto_tls_creds_anon_info = { 198 .parent = TYPE_QCRYPTO_TLS_CREDS, 199 .name = TYPE_QCRYPTO_TLS_CREDS_ANON, 200 .instance_size = sizeof(QCryptoTLSCredsAnon), 201 .instance_finalize = qcrypto_tls_creds_anon_finalize, 202 .class_size = sizeof(QCryptoTLSCredsAnonClass), 203 .class_init = qcrypto_tls_creds_anon_class_init, 204 .interfaces = (InterfaceInfo[]) { 205 { TYPE_USER_CREATABLE }, 206 { } 207 } 208 }; 209 210 211 static void 212 qcrypto_tls_creds_anon_register_types(void) 213 { 214 type_register_static(&qcrypto_tls_creds_anon_info); 215 } 216 217 218 type_init(qcrypto_tls_creds_anon_register_types); 219