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 "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_channel_process_incoming(migrate_get_current(), 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         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_channel_connect(s, ioc, NULL);
 123     }
 124     object_unref(OBJECT(ioc));
 125 }
 126
 127
 128 void migration_tls_channel_connect(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 }