1 /* 2 * QEMU migration TLS 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 "channel.h" 23 #include "migration.h" 24 #include "tls.h" 25 #include "options.h" 26 #include "crypto/tlscreds.h" 27 #include "qemu/error-report.h" 28 #include "qapi/error.h" 29 #include "trace.h" 30 31 static QCryptoTLSCreds * 32 migration_tls_get_creds(MigrationState *s, 33 QCryptoTLSCredsEndpoint endpoint, 34 Error **errp) 35 { 36 Object *creds; 37 QCryptoTLSCreds *ret; 38 39 creds = object_resolve_path_component( 40 object_get_objects_root(), s->parameters.tls_creds); 41 if (!creds) { 42 error_setg(errp, "No TLS credentials with id '%s'", 43 s->parameters.tls_creds); 44 return NULL; 45 } 46 ret = (QCryptoTLSCreds *)object_dynamic_cast( 47 creds, TYPE_QCRYPTO_TLS_CREDS); 48 if (!ret) { 49 error_setg(errp, "Object with id '%s' is not TLS credentials", 50 s->parameters.tls_creds); 51 return NULL; 52 } 53 if (!qcrypto_tls_creds_check_endpoint(ret, endpoint, errp)) { 54 return NULL; 55 } 56 57 return ret; 58 } 59 60 61 static void migration_tls_incoming_handshake(QIOTask *task, 62 gpointer opaque) 63 { 64 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 65 Error *err = NULL; 66 67 if (qio_task_propagate_error(task, &err)) { 68 trace_migration_tls_incoming_handshake_error(error_get_pretty(err)); 69 error_report_err(err); 70 } else { 71 trace_migration_tls_incoming_handshake_complete(); 72 migration_channel_process_incoming(ioc); 73 } 74 object_unref(OBJECT(ioc)); 75 } 76 77 void migration_tls_channel_process_incoming(MigrationState *s, 78 QIOChannel *ioc, 79 Error **errp) 80 { 81 QCryptoTLSCreds *creds; 82 QIOChannelTLS *tioc; 83 84 creds = migration_tls_get_creds( 85 s, QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, errp); 86 if (!creds) { 87 return; 88 } 89 90 tioc = qio_channel_tls_new_server( 91 ioc, creds, 92 s->parameters.tls_authz, 93 errp); 94 if (!tioc) { 95 return; 96 } 97 98 trace_migration_tls_incoming_handshake_start(); 99 qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming"); 100 qio_channel_tls_handshake(tioc, 101 migration_tls_incoming_handshake, 102 NULL, 103 NULL, 104 NULL); 105 } 106 107 108 static void migration_tls_outgoing_handshake(QIOTask *task, 109 gpointer opaque) 110 { 111 MigrationState *s = opaque; 112 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 113 Error *err = NULL; 114 115 if (qio_task_propagate_error(task, &err)) { 116 trace_migration_tls_outgoing_handshake_error(error_get_pretty(err)); 117 } else { 118 trace_migration_tls_outgoing_handshake_complete(); 119 } 120 migration_channel_connect(s, ioc, NULL, err); 121 object_unref(OBJECT(ioc)); 122 } 123 124 QIOChannelTLS *migration_tls_client_create(MigrationState *s, 125 QIOChannel *ioc, 126 const char *hostname, 127 Error **errp) 128 { 129 QCryptoTLSCreds *creds; 130 131 creds = migration_tls_get_creds( 132 s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp); 133 if (!creds) { 134 return NULL; 135 } 136 137 if (s->parameters.tls_hostname && *s->parameters.tls_hostname) { 138 hostname = s->parameters.tls_hostname; 139 } 140 141 return qio_channel_tls_new_client(ioc, creds, hostname, errp); 142 } 143 144 void migration_tls_channel_connect(MigrationState *s, 145 QIOChannel *ioc, 146 const char *hostname, 147 Error **errp) 148 { 149 QIOChannelTLS *tioc; 150 151 tioc = migration_tls_client_create(s, ioc, hostname, errp); 152 if (!tioc) { 153 return; 154 } 155 156 /* Save hostname into MigrationState for handshake */ 157 s->hostname = g_strdup(hostname); 158 trace_migration_tls_outgoing_handshake_start(hostname); 159 qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-outgoing"); 160 qio_channel_tls_handshake(tioc, 161 migration_tls_outgoing_handshake, 162 s, 163 NULL, 164 NULL); 165 } 166 167 bool migrate_channel_requires_tls_upgrade(QIOChannel *ioc) 168 { 169 if (!migrate_tls()) { 170 return false; 171 } 172 173 return !object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS); 174 } 175