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_complete(UserCreatable *uc, Error **errp) 123 { 124 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(uc); 125 126 qcrypto_tls_creds_anon_load(creds, errp); 127 } 128 129 130 #ifdef CONFIG_GNUTLS 131 132 133 static bool 134 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj, 135 Error **errp G_GNUC_UNUSED) 136 { 137 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 138 139 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { 140 return creds->data.server != NULL; 141 } else { 142 return creds->data.client != NULL; 143 } 144 } 145 146 147 #else /* ! CONFIG_GNUTLS */ 148 149 150 static bool 151 qcrypto_tls_creds_anon_prop_get_loaded(Object *obj G_GNUC_UNUSED, 152 Error **errp G_GNUC_UNUSED) 153 { 154 return false; 155 } 156 157 158 #endif /* ! CONFIG_GNUTLS */ 159 160 161 static void 162 qcrypto_tls_creds_anon_finalize(Object *obj) 163 { 164 QCryptoTLSCredsAnon *creds = QCRYPTO_TLS_CREDS_ANON(obj); 165 166 qcrypto_tls_creds_anon_unload(creds); 167 } 168 169 170 static void 171 qcrypto_tls_creds_anon_class_init(ObjectClass *oc, void *data) 172 { 173 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 174 175 ucc->complete = qcrypto_tls_creds_anon_complete; 176 177 object_class_property_add_bool(oc, "loaded", 178 qcrypto_tls_creds_anon_prop_get_loaded, 179 NULL); 180 } 181 182 183 static const TypeInfo qcrypto_tls_creds_anon_info = { 184 .parent = TYPE_QCRYPTO_TLS_CREDS, 185 .name = TYPE_QCRYPTO_TLS_CREDS_ANON, 186 .instance_size = sizeof(QCryptoTLSCredsAnon), 187 .instance_finalize = qcrypto_tls_creds_anon_finalize, 188 .class_size = sizeof(QCryptoTLSCredsAnonClass), 189 .class_init = qcrypto_tls_creds_anon_class_init, 190 .interfaces = (InterfaceInfo[]) { 191 { TYPE_USER_CREATABLE }, 192 { } 193 } 194 }; 195 196 197 static void 198 qcrypto_tls_creds_anon_register_types(void) 199 { 200 type_register_static(&qcrypto_tls_creds_anon_info); 201 } 202 203 204 type_init(qcrypto_tls_creds_anon_register_types); 205