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 "crypto/tlscreds.h" 26 #include "qemu/error-report.h" 27 #include "qapi/error.h" 28 #include "trace.h" 29 30 static QCryptoTLSCreds * 31 migration_tls_get_creds(MigrationState *s, 32 QCryptoTLSCredsEndpoint endpoint, 33 Error **errp) 34 { 35 Object *creds; 36 QCryptoTLSCreds *ret; 37 38 creds = object_resolve_path_component( 39 object_get_objects_root(), s->parameters.tls_creds); 40 if (!creds) { 41 error_setg(errp, "No TLS credentials with id '%s'", 42 s->parameters.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 s->parameters.tls_creds); 50 return NULL; 51 } 52 if (ret->endpoint != endpoint) { 53 error_setg(errp, 54 "Expected TLS credentials for a %s endpoint", 55 endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT ? 56 "client" : "server"); 57 return NULL; 58 } 59 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(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 s->parameters.tls_authz, 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 NULL); 108 } 109 110 111 static void migration_tls_outgoing_handshake(QIOTask *task, 112 gpointer opaque) 113 { 114 MigrationState *s = opaque; 115 QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task)); 116 Error *err = NULL; 117 118 if (qio_task_propagate_error(task, &err)) { 119 trace_migration_tls_outgoing_handshake_error(error_get_pretty(err)); 120 } else { 121 trace_migration_tls_outgoing_handshake_complete(); 122 } 123 migration_channel_connect(s, ioc, NULL, err); 124 object_unref(OBJECT(ioc)); 125 } 126 127 QIOChannelTLS *migration_tls_client_create(MigrationState *s, 128 QIOChannel *ioc, 129 const char *hostname, 130 Error **errp) 131 { 132 QCryptoTLSCreds *creds; 133 QIOChannelTLS *tioc; 134 135 creds = migration_tls_get_creds( 136 s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp); 137 if (!creds) { 138 return NULL; 139 } 140 141 if (s->parameters.tls_hostname && *s->parameters.tls_hostname) { 142 hostname = s->parameters.tls_hostname; 143 } 144 if (!hostname) { 145 error_setg(errp, "No hostname available for TLS"); 146 return NULL; 147 } 148 149 tioc = qio_channel_tls_new_client( 150 ioc, creds, hostname, errp); 151 152 return tioc; 153 } 154 155 void migration_tls_channel_connect(MigrationState *s, 156 QIOChannel *ioc, 157 const char *hostname, 158 Error **errp) 159 { 160 QIOChannelTLS *tioc; 161 162 tioc = migration_tls_client_create(s, ioc, hostname, errp); 163 if (!tioc) { 164 return; 165 } 166 167 /* Save hostname into MigrationState for handshake */ 168 s->hostname = g_strdup(hostname); 169 trace_migration_tls_outgoing_handshake_start(hostname); 170 qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-outgoing"); 171 qio_channel_tls_handshake(tioc, 172 migration_tls_outgoing_handshake, 173 s, 174 NULL, 175 NULL); 176 } 177