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