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 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 "io/channel-tls.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 (ret->endpoint != endpoint) { 54 error_setg(errp, 55 "Expected TLS credentials for a %s endpoint", 56 endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT ? 57 "client" : "server"); 58 return NULL; 59 } 60 61 object_ref(OBJECT(ret)); 62 return ret; 63 } 64 65 66 static void migration_tls_incoming_handshake(QIOTask *task, 67 gpointer opaque) 68 { 69 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 70 Error *err = NULL; 71 72 if (qio_task_propagate_error(task, &err)) { 73 trace_migration_tls_incoming_handshake_error(error_get_pretty(err)); 74 error_report_err(err); 75 } else { 76 trace_migration_tls_incoming_handshake_complete(); 77 migration_channel_process_incoming(ioc); 78 } 79 object_unref(OBJECT(ioc)); 80 } 81 82 void migration_tls_channel_process_incoming(MigrationState *s, 83 QIOChannel *ioc, 84 Error **errp) 85 { 86 QCryptoTLSCreds *creds; 87 QIOChannelTLS *tioc; 88 89 creds = migration_tls_get_creds( 90 s, QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, errp); 91 if (!creds) { 92 return; 93 } 94 95 tioc = qio_channel_tls_new_server( 96 ioc, creds, 97 s->parameters.tls_authz, 98 errp); 99 if (!tioc) { 100 return; 101 } 102 103 trace_migration_tls_incoming_handshake_start(); 104 qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming"); 105 qio_channel_tls_handshake(tioc, 106 migration_tls_incoming_handshake, 107 NULL, 108 NULL, 109 NULL); 110 } 111 112 113 static void migration_tls_outgoing_handshake(QIOTask *task, 114 gpointer opaque) 115 { 116 MigrationState *s = opaque; 117 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 118 Error *err = NULL; 119 120 if (qio_task_propagate_error(task, &err)) { 121 trace_migration_tls_outgoing_handshake_error(error_get_pretty(err)); 122 } else { 123 trace_migration_tls_outgoing_handshake_complete(); 124 } 125 migration_channel_connect(s, ioc, NULL, err); 126 object_unref(OBJECT(ioc)); 127 } 128 129 130 void migration_tls_channel_connect(MigrationState *s, 131 QIOChannel *ioc, 132 const char *hostname, 133 Error **errp) 134 { 135 QCryptoTLSCreds *creds; 136 QIOChannelTLS *tioc; 137 138 creds = migration_tls_get_creds( 139 s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp); 140 if (!creds) { 141 return; 142 } 143 144 if (s->parameters.tls_hostname && *s->parameters.tls_hostname) { 145 hostname = s->parameters.tls_hostname; 146 } 147 if (!hostname) { 148 error_setg(errp, "No hostname available for TLS"); 149 return; 150 } 151 152 tioc = qio_channel_tls_new_client( 153 ioc, creds, hostname, errp); 154 if (!tioc) { 155 return; 156 } 157 158 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