migration/tls.c

   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 "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 (!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(
  90         ioc, creds,
  91         s->parameters.tls_authz,
  92         errp);
  93     if (!tioc) {
  94         return;
  95     }
  96
  97     trace_migration_tls_incoming_handshake_start();
  98     qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming");
  99     qio_channel_tls_handshake(tioc,
 100                               migration_tls_incoming_handshake,
 101                               NULL,
 102                               NULL,
 103                               NULL);
 104 }
 105
 106
 107 static void migration_tls_outgoing_handshake(QIOTask *task,
 108                                              gpointer opaque)
 109 {
 110     MigrationState *s = opaque;
 111     QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
 112     Error *err = NULL;
 113
 114     if (qio_task_propagate_error(task, &err)) {
 115         trace_migration_tls_outgoing_handshake_error(error_get_pretty(err));
 116     } else {
 117         trace_migration_tls_outgoing_handshake_complete();
 118     }
 119     migration_channel_connect(s, ioc, NULL, err);
 120     object_unref(OBJECT(ioc));
 121 }
 122
 123 QIOChannelTLS *migration_tls_client_create(MigrationState *s,
 124                                            QIOChannel *ioc,
 125                                            const char *hostname,
 126                                            Error **errp)
 127 {
 128     QCryptoTLSCreds *creds;
 129
 130     creds = migration_tls_get_creds(
 131         s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp);
 132     if (!creds) {
 133         return NULL;
 134     }
 135
 136     if (s->parameters.tls_hostname && *s->parameters.tls_hostname) {
 137         hostname = s->parameters.tls_hostname;
 138     }
 139
 140     return qio_channel_tls_new_client(ioc, creds, hostname, errp);
 141 }
 142
 143 void migration_tls_channel_connect(MigrationState *s,
 144                                    QIOChannel *ioc,
 145                                    const char *hostname,
 146                                    Error **errp)
 147 {
 148     QIOChannelTLS *tioc;
 149
 150     tioc = migration_tls_client_create(s, ioc, hostname, errp);
 151     if (!tioc) {
 152         return;
 153     }
 154
 155     /* Save hostname into MigrationState for handshake */
 156     s->hostname = g_strdup(hostname);
 157     trace_migration_tls_outgoing_handshake_start(hostname);
 158     qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-outgoing");
 159     qio_channel_tls_handshake(tioc,
 160                               migration_tls_outgoing_handshake,
 161                               s,
 162                               NULL,
 163                               NULL);
 164 }
 165
 166 bool migrate_channel_requires_tls_upgrade(QIOChannel *ioc)
 167 {
 168     if (!migrate_use_tls()) {
 169         return false;
 170     }
 171
 172     return !object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS);
 173 }