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