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 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 }