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(Object *src, 65 Error *err, 66 gpointer opaque) 67 { 68 QIOChannel *ioc = QIO_CHANNEL(src); 69 70 if (err) { 71 trace_migration_tls_incoming_handshake_error(error_get_pretty(err)); 72 error_report("%s", error_get_pretty(err)); 73 } else { 74 trace_migration_tls_incoming_handshake_complete(); 75 migration_set_incoming_channel(migrate_get_current(), ioc); 76 } 77 object_unref(OBJECT(ioc)); 78 } 79 80 void migration_tls_set_incoming_channel(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_tls_handshake(tioc, 103 migration_tls_incoming_handshake, 104 NULL, 105 NULL); 106 } 107 108 109 static void migration_tls_outgoing_handshake(Object *src, 110 Error *err, 111 gpointer opaque) 112 { 113 MigrationState *s = opaque; 114 QIOChannel *ioc = QIO_CHANNEL(src); 115 116 if (err) { 117 trace_migration_tls_outgoing_handshake_error(error_get_pretty(err)); 118 s->to_dst_file = NULL; 119 migrate_fd_error(s, err); 120 } else { 121 trace_migration_tls_outgoing_handshake_complete(); 122 migration_set_outgoing_channel(s, ioc, NULL); 123 } 124 object_unref(OBJECT(ioc)); 125 } 126 127 128 void migration_tls_set_outgoing_channel(MigrationState *s, 129 QIOChannel *ioc, 130 const char *hostname, 131 Error **errp) 132 { 133 QCryptoTLSCreds *creds; 134 QIOChannelTLS *tioc; 135 136 creds = migration_tls_get_creds( 137 s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp); 138 if (!creds) { 139 return; 140 } 141 142 if (s->parameters.tls_hostname) { 143 hostname = s->parameters.tls_hostname; 144 } 145 if (!hostname) { 146 error_setg(errp, "No hostname available for TLS"); 147 return; 148 } 149 150 tioc = qio_channel_tls_new_client( 151 ioc, creds, hostname, errp); 152 if (!tioc) { 153 return; 154 } 155 156 trace_migration_tls_outgoing_handshake_start(hostname); 157 qio_channel_tls_handshake(tioc, 158 migration_tls_outgoing_handshake, 159 s, 160 NULL); 161 } 162