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 "options.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 (!qcrypto_tls_creds_check_endpoint(ret, endpoint, errp)) {
  54         return NULL;
  55     }
  56
  57     return ret;
  58 }
  59
  60
  61 static void migration_tls_incoming_handshake(QIOTask *task,
  62                                              gpointer opaque)
  63 {
  64     QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
  65     Error *err = NULL;
  66
  67     if (qio_task_propagate_error(task, &err)) {
  68         trace_migration_tls_incoming_handshake_error(error_get_pretty(err));
  69         error_report_err(err);
  70     } else {
  71         trace_migration_tls_incoming_handshake_complete();
  72         migration_channel_process_incoming(ioc);
  73     }
  74     object_unref(OBJECT(ioc));
  75 }
  76
  77 void migration_tls_channel_process_incoming(MigrationState *s,
  78                                             QIOChannel *ioc,
  79                                             Error **errp)
  80 {
  81     QCryptoTLSCreds *creds;
  82     QIOChannelTLS *tioc;
  83
  84     creds = migration_tls_get_creds(
  85         s, QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, errp);
  86     if (!creds) {
  87         return;
  88     }
  89
  90     tioc = qio_channel_tls_new_server(
  91         ioc, creds,
  92         s->parameters.tls_authz,
  93         errp);
  94     if (!tioc) {
  95         return;
  96     }
  97
  98     trace_migration_tls_incoming_handshake_start();
  99     qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming");
 100     qio_channel_tls_handshake(tioc,
 101                               migration_tls_incoming_handshake,
 102                               NULL,
 103                               NULL,
 104                               NULL);
 105 }
 106
 107
 108 static void migration_tls_outgoing_handshake(QIOTask *task,
 109                                              gpointer opaque)
 110 {
 111     MigrationState *s = opaque;
 112     QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
 113     Error *err = NULL;
 114
 115     if (qio_task_propagate_error(task, &err)) {
 116         trace_migration_tls_outgoing_handshake_error(error_get_pretty(err));
 117     } else {
 118         trace_migration_tls_outgoing_handshake_complete();
 119     }
 120     migration_channel_connect(s, ioc, NULL, err);
 121     object_unref(OBJECT(ioc));
 122 }
 123
 124 QIOChannelTLS *migration_tls_client_create(MigrationState *s,
 125                                            QIOChannel *ioc,
 126                                            const char *hostname,
 127                                            Error **errp)
 128 {
 129     QCryptoTLSCreds *creds;
 130
 131     creds = migration_tls_get_creds(
 132         s, QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp);
 133     if (!creds) {
 134         return NULL;
 135     }
 136
 137     if (s->parameters.tls_hostname && *s->parameters.tls_hostname) {
 138         hostname = s->parameters.tls_hostname;
 139     }
 140
 141     return qio_channel_tls_new_client(ioc, creds, hostname, errp);
 142 }
 143
 144 void migration_tls_channel_connect(MigrationState *s,
 145                                    QIOChannel *ioc,
 146                                    const char *hostname,
 147                                    Error **errp)
 148 {
 149     QIOChannelTLS *tioc;
 150
 151     tioc = migration_tls_client_create(s, ioc, hostname, errp);
 152     if (!tioc) {
 153         return;
 154     }
 155
 156     /* Save hostname into MigrationState for handshake */
 157     s->hostname = g_strdup(hostname);
 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
 167 bool migrate_channel_requires_tls_upgrade(QIOChannel *ioc)
 168 {
 169     if (!migrate_tls()) {
 170         return false;
 171     }
 172
 173     return !object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS);
 174 }