io/channel-tls.c

   1 /*
   2  * QEMU I/O channels TLS driver
   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 "qapi/error.h"
  23 #include "io/channel-tls.h"
  24 #include "trace.h"
  25
  26
  27 static ssize_t qio_channel_tls_write_handler(const char *buf,
  28                                              size_t len,
  29                                              void *opaque)
  30 {
  31     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
  32     ssize_t ret;
  33
  34     ret = qio_channel_write(tioc->master, buf, len, NULL);
  35     if (ret == QIO_CHANNEL_ERR_BLOCK) {
  36         errno = EAGAIN;
  37         return -1;
  38     } else if (ret < 0) {
  39         errno = EIO;
  40         return -1;
  41     }
  42     return ret;
  43 }
  44
  45 static ssize_t qio_channel_tls_read_handler(char *buf,
  46                                             size_t len,
  47                                             void *opaque)
  48 {
  49     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
  50     ssize_t ret;
  51
  52     ret = qio_channel_read(tioc->master, buf, len, NULL);
  53     if (ret == QIO_CHANNEL_ERR_BLOCK) {
  54         errno = EAGAIN;
  55         return -1;
  56     } else if (ret < 0) {
  57         errno = EIO;
  58         return -1;
  59     }
  60     return ret;
  61 }
  62
  63
  64 QIOChannelTLS *
  65 qio_channel_tls_new_server(QIOChannel *master,
  66                            QCryptoTLSCreds *creds,
  67                            const char *aclname,
  68                            Error **errp)
  69 {
  70     QIOChannelTLS *ioc;
  71
  72     ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
  73
  74     ioc->master = master;
  75     object_ref(OBJECT(master));
  76
  77     ioc->session = qcrypto_tls_session_new(
  78         creds,
  79         NULL,
  80         aclname,
  81         QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
  82         errp);
  83     if (!ioc->session) {
  84         goto error;
  85     }
  86
  87     qcrypto_tls_session_set_callbacks(
  88         ioc->session,
  89         qio_channel_tls_write_handler,
  90         qio_channel_tls_read_handler,
  91         ioc);
  92
  93     trace_qio_channel_tls_new_server(ioc, master, creds, aclname);
  94     return ioc;
  95
  96  error:
  97     object_unref(OBJECT(ioc));
  98     return NULL;
  99 }
 100
 101 QIOChannelTLS *
 102 qio_channel_tls_new_client(QIOChannel *master,
 103                            QCryptoTLSCreds *creds,
 104                            const char *hostname,
 105                            Error **errp)
 106 {
 107     QIOChannelTLS *tioc;
 108     QIOChannel *ioc;
 109
 110     tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
 111     ioc = QIO_CHANNEL(tioc);
 112
 113     tioc->master = master;
 114     if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
 115         qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
 116     }
 117     object_ref(OBJECT(master));
 118
 119     tioc->session = qcrypto_tls_session_new(
 120         creds,
 121         hostname,
 122         NULL,
 123         QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
 124         errp);
 125     if (!tioc->session) {
 126         goto error;
 127     }
 128
 129     qcrypto_tls_session_set_callbacks(
 130         tioc->session,
 131         qio_channel_tls_write_handler,
 132         qio_channel_tls_read_handler,
 133         tioc);
 134
 135     trace_qio_channel_tls_new_client(tioc, master, creds, hostname);
 136     return tioc;
 137
 138  error:
 139     object_unref(OBJECT(tioc));
 140     return NULL;
 141 }
 142
 143 struct QIOChannelTLSData {
 144     QIOTask *task;
 145     GMainContext *context;
 146 };
 147 typedef struct QIOChannelTLSData QIOChannelTLSData;
 148
 149 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
 150                                              GIOCondition condition,
 151                                              gpointer user_data);
 152
 153 static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc,
 154                                            QIOTask *task,
 155                                            GMainContext *context)
 156 {
 157     Error *err = NULL;
 158     QCryptoTLSSessionHandshakeStatus status;
 159
 160     if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) {
 161         trace_qio_channel_tls_handshake_fail(ioc);
 162         qio_task_set_error(task, err);
 163         qio_task_complete(task);
 164         return;
 165     }
 166
 167     status = qcrypto_tls_session_get_handshake_status(ioc->session);
 168     if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
 169         trace_qio_channel_tls_handshake_complete(ioc);
 170         if (qcrypto_tls_session_check_credentials(ioc->session,
 171                                                   &err) < 0) {
 172             trace_qio_channel_tls_credentials_deny(ioc);
 173             qio_task_set_error(task, err);
 174         } else {
 175             trace_qio_channel_tls_credentials_allow(ioc);
 176         }
 177         qio_task_complete(task);
 178     } else {
 179         GIOCondition condition;
 180         QIOChannelTLSData *data = g_new0(typeof(*data), 1);
 181
 182         data->task = task;
 183         data->context = context;
 184
 185         if (context) {
 186             g_main_context_ref(context);
 187         }
 188
 189         if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) {
 190             condition = G_IO_OUT;
 191         } else {
 192             condition = G_IO_IN;
 193         }
 194
 195         trace_qio_channel_tls_handshake_pending(ioc, status);
 196         qio_channel_add_watch_full(ioc->master,
 197                                    condition,
 198                                    qio_channel_tls_handshake_io,
 199                                    data,
 200                                    NULL,
 201                                    context);
 202     }
 203 }
 204
 205
 206 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
 207                                              GIOCondition condition,
 208                                              gpointer user_data)
 209 {
 210     QIOChannelTLSData *data = user_data;
 211     QIOTask *task = data->task;
 212     GMainContext *context = data->context;
 213     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
 214         qio_task_get_source(task));
 215
 216     g_free(data);
 217     qio_channel_tls_handshake_task(tioc, task, context);
 218
 219     if (context) {
 220         g_main_context_unref(context);
 221     }
 222
 223     return FALSE;
 224 }
 225
 226 void qio_channel_tls_handshake(QIOChannelTLS *ioc,
 227                                QIOTaskFunc func,
 228                                gpointer opaque,
 229                                GDestroyNotify destroy,
 230                                GMainContext *context)
 231 {
 232     QIOTask *task;
 233
 234     task = qio_task_new(OBJECT(ioc),
 235                         func, opaque, destroy);
 236
 237     trace_qio_channel_tls_handshake_start(ioc);
 238     qio_channel_tls_handshake_task(ioc, task, context);
 239 }
 240
 241
 242 static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
 243 {
 244 }
 245
 246
 247 static void qio_channel_tls_finalize(Object *obj)
 248 {
 249     QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
 250
 251     object_unref(OBJECT(ioc->master));
 252     qcrypto_tls_session_free(ioc->session);
 253 }
 254
 255
 256 static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
 257                                      const struct iovec *iov,
 258                                      size_t niov,
 259                                      int **fds,
 260                                      size_t *nfds,
 261                                      Error **errp)
 262 {
 263     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 264     size_t i;
 265     ssize_t got = 0;
 266
 267     for (i = 0 ; i < niov ; i++) {
 268         ssize_t ret = qcrypto_tls_session_read(tioc->session,
 269                                                iov[i].iov_base,
 270                                                iov[i].iov_len);
 271         if (ret < 0) {
 272             if (errno == EAGAIN) {
 273                 if (got) {
 274                     return got;
 275                 } else {
 276                     return QIO_CHANNEL_ERR_BLOCK;
 277                 }
 278             }
 279
 280             error_setg_errno(errp, errno,
 281                              "Cannot read from TLS channel");
 282             return -1;
 283         }
 284         got += ret;
 285         if (ret < iov[i].iov_len) {
 286             break;
 287         }
 288     }
 289     return got;
 290 }
 291
 292
 293 static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
 294                                       const struct iovec *iov,
 295                                       size_t niov,
 296                                       int *fds,
 297                                       size_t nfds,
 298                                       Error **errp)
 299 {
 300     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 301     size_t i;
 302     ssize_t done = 0;
 303
 304     for (i = 0 ; i < niov ; i++) {
 305         ssize_t ret = qcrypto_tls_session_write(tioc->session,
 306                                                 iov[i].iov_base,
 307                                                 iov[i].iov_len);
 308         if (ret <= 0) {
 309             if (errno == EAGAIN) {
 310                 if (done) {
 311                     return done;
 312                 } else {
 313                     return QIO_CHANNEL_ERR_BLOCK;
 314                 }
 315             }
 316
 317             error_setg_errno(errp, errno,
 318                              "Cannot write to TLS channel");
 319             return -1;
 320         }
 321         done += ret;
 322         if (ret < iov[i].iov_len) {
 323             break;
 324         }
 325     }
 326     return done;
 327 }
 328
 329 static int qio_channel_tls_set_blocking(QIOChannel *ioc,
 330                                         bool enabled,
 331                                         Error **errp)
 332 {
 333     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 334
 335     return qio_channel_set_blocking(tioc->master, enabled, errp);
 336 }
 337
 338 static void qio_channel_tls_set_delay(QIOChannel *ioc,
 339                                       bool enabled)
 340 {
 341     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 342
 343     qio_channel_set_delay(tioc->master, enabled);
 344 }
 345
 346 static void qio_channel_tls_set_cork(QIOChannel *ioc,
 347                                      bool enabled)
 348 {
 349     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 350
 351     qio_channel_set_cork(tioc->master, enabled);
 352 }
 353
 354 static int qio_channel_tls_shutdown(QIOChannel *ioc,
 355                                     QIOChannelShutdown how,
 356                                     Error **errp)
 357 {
 358     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 359
 360     return qio_channel_shutdown(tioc->master, how, errp);
 361 }
 362
 363 static int qio_channel_tls_close(QIOChannel *ioc,
 364                                  Error **errp)
 365 {
 366     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 367
 368     return qio_channel_close(tioc->master, errp);
 369 }
 370
 371 static void qio_channel_tls_set_aio_fd_handler(QIOChannel *ioc,
 372                                                AioContext *ctx,
 373                                                IOHandler *io_read,
 374                                                IOHandler *io_write,
 375                                                void *opaque)
 376 {
 377     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 378
 379     qio_channel_set_aio_fd_handler(tioc->master, ctx, io_read, io_write, opaque);
 380 }
 381
 382 static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
 383                                              GIOCondition condition)
 384 {
 385     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 386
 387     return qio_channel_create_watch(tioc->master, condition);
 388 }
 389
 390 QCryptoTLSSession *
 391 qio_channel_tls_get_session(QIOChannelTLS *ioc)
 392 {
 393     return ioc->session;
 394 }
 395
 396 static void qio_channel_tls_class_init(ObjectClass *klass,
 397                                        void *class_data G_GNUC_UNUSED)
 398 {
 399     QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
 400
 401     ioc_klass->io_writev = qio_channel_tls_writev;
 402     ioc_klass->io_readv = qio_channel_tls_readv;
 403     ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
 404     ioc_klass->io_set_delay = qio_channel_tls_set_delay;
 405     ioc_klass->io_set_cork = qio_channel_tls_set_cork;
 406     ioc_klass->io_close = qio_channel_tls_close;
 407     ioc_klass->io_shutdown = qio_channel_tls_shutdown;
 408     ioc_klass->io_create_watch = qio_channel_tls_create_watch;
 409     ioc_klass->io_set_aio_fd_handler = qio_channel_tls_set_aio_fd_handler;
 410 }
 411
 412 static const TypeInfo qio_channel_tls_info = {
 413     .parent = TYPE_QIO_CHANNEL,
 414     .name = TYPE_QIO_CHANNEL_TLS,
 415     .instance_size = sizeof(QIOChannelTLS),
 416     .instance_init = qio_channel_tls_init,
 417     .instance_finalize = qio_channel_tls_finalize,
 418     .class_init = qio_channel_tls_class_init,
 419 };
 420
 421 static void qio_channel_tls_register_types(void)
 422 {
 423     type_register_static(&qio_channel_tls_info);
 424 }
 425
 426 type_init(qio_channel_tls_register_types);