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 "migration/migration.h" 23 #include "io/channel-tls.h" 24 #include "crypto/tlscreds.h" 25 #include "qemu/error-report.h" 26 #include "qapi/error.h" 27 #include "trace.h" 28 29 static QCryptoTLSCreds * 30 migration_tls_get_creds(MigrationState *s, 31 QCryptoTLSCredsEndpoint endpoint, 32 Error **errp) 33 { 34 Object *creds; 35 QCryptoTLSCreds *ret; 36 37 creds = object_resolve_path_component( 38 object_get_objects_root(), s->parameters.tls_creds); 39 if (!creds) { 40 error_setg(errp, "No TLS credentials with id '%s'", 41 s->parameters.tls_creds); 42 return NULL; 43 } 44 ret = (QCryptoTLSCreds *)object_dynamic_cast( 45 creds, TYPE_QCRYPTO_TLS_CREDS); 46 if (!ret) { 47 error_setg(errp, "Object with id '%s' is not TLS credentials", 48 s->parameters.tls_creds); 49 return NULL; 50 } 51 if (ret->endpoint != endpoint) { 52 error_setg(errp, 53 "Expected TLS credentials for a %s endpoint", 54 endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT ? 55 "client" : "server"); 56 return NULL; 57 } 58 59 object_ref(OBJECT(ret)); 60 return ret; 61 } 62 63 64 static void migration_tls_incoming_handshake(QIOTask *task, 65 gpointer opaque) 66 { 67 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 68 Error *err = NULL; 69 70 if (qio_task_propagate_error(task, &err)) { 71 trace_migration_tls_incoming_handshake_error(error_get_pretty(err)); 72 error_report_err(err); 73 } else { 74 trace_migration_tls_incoming_handshake_complete(); 75 migration_channel_process_incoming(migrate_get_current(), ioc); 76 } 77 object_unref(OBJECT(ioc)); 78 } 79 80 void migration_tls_channel_process_incoming(MigrationState *s, 81 QIOChannel *ioc, 82 Error **errp) 83 { 84 QCryptoTLSCreds *creds; 85 QIOChannelTLS *tioc; 86 87 creds = migration_tls_get_creds( 88 s, QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, errp); 89 if (!creds) { 90 return; 91 } 92 93 tioc = qio_channel_tls_new_server( 94 ioc, creds, 95 NULL, /* XXX pass ACL name */ 96 errp); 97 if (!tioc) { 98 return; 99 } 100 101 trace_migration_tls_incoming_handshake_start(); 102 qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming"); 103 qio_channel_tls_handshake(tioc, 104 migration_tls_incoming_handshake, 105 NULL, 106 NULL); 107 } 108 109 110 static void migration_tls_outgoing_handshake(QIOTask *task, 111 gpointer opaque) 112 { 113 MigrationState *s = opaque; 114 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 115 Error *err = NULL; 116 117 if (qio_task_propagate_error(task, &err)) { 118 trace_migration_tls_outgoing_handshake_error(error_get_pretty(err)); 119 s->to_dst_file = NULL; 120 migrate_fd_error(s, err); 121 error_free(err); 122 } else { 123 trace_migration_tls_outgoing_handshake_complete(); 124 migration_channel_connect(s, ioc, NULL); 125 } 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 } 165