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
 144 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
 145                                              GIOCondition condition,
 146                                              gpointer user_data);
 147
 148 static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc,
 149                                            QIOTask *task)
 150 {
 151     Error *err = NULL;
 152     QCryptoTLSSessionHandshakeStatus status;
 153
 154     if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) {
 155         trace_qio_channel_tls_handshake_fail(ioc);
 156         qio_task_abort(task, err);
 157         goto cleanup;
 158     }
 159
 160     status = qcrypto_tls_session_get_handshake_status(ioc->session);
 161     if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
 162         trace_qio_channel_tls_handshake_complete(ioc);
 163         if (qcrypto_tls_session_check_credentials(ioc->session,
 164                                                   &err) < 0) {
 165             trace_qio_channel_tls_credentials_deny(ioc);
 166             qio_task_abort(task, err);
 167             goto cleanup;
 168         }
 169         trace_qio_channel_tls_credentials_allow(ioc);
 170         qio_task_complete(task);
 171     } else {
 172         GIOCondition condition;
 173         if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) {
 174             condition = G_IO_OUT;
 175         } else {
 176             condition = G_IO_IN;
 177         }
 178
 179         trace_qio_channel_tls_handshake_pending(ioc, status);
 180         qio_channel_add_watch(ioc->master,
 181                               condition,
 182                               qio_channel_tls_handshake_io,
 183                               task,
 184                               NULL);
 185     }
 186
 187  cleanup:
 188     error_free(err);
 189 }
 190
 191
 192 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
 193                                              GIOCondition condition,
 194                                              gpointer user_data)
 195 {
 196     QIOTask *task = user_data;
 197     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
 198         qio_task_get_source(task));
 199
 200     qio_channel_tls_handshake_task(
 201        tioc, task);
 202
 203     object_unref(OBJECT(tioc));
 204
 205     return FALSE;
 206 }
 207
 208 void qio_channel_tls_handshake(QIOChannelTLS *ioc,
 209                                QIOTaskFunc func,
 210                                gpointer opaque,
 211                                GDestroyNotify destroy)
 212 {
 213     QIOTask *task;
 214
 215     task = qio_task_new(OBJECT(ioc),
 216                         func, opaque, destroy);
 217
 218     trace_qio_channel_tls_handshake_start(ioc);
 219     qio_channel_tls_handshake_task(ioc, task);
 220 }
 221
 222
 223 static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
 224 {
 225 }
 226
 227
 228 static void qio_channel_tls_finalize(Object *obj)
 229 {
 230     QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
 231
 232     object_unref(OBJECT(ioc->master));
 233     qcrypto_tls_session_free(ioc->session);
 234 }
 235
 236
 237 static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
 238                                      const struct iovec *iov,
 239                                      size_t niov,
 240                                      int **fds,
 241                                      size_t *nfds,
 242                                      Error **errp)
 243 {
 244     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 245     size_t i;
 246     ssize_t got = 0;
 247
 248     for (i = 0 ; i < niov ; i++) {
 249         ssize_t ret = qcrypto_tls_session_read(tioc->session,
 250                                                iov[i].iov_base,
 251                                                iov[i].iov_len);
 252         if (ret < 0) {
 253             if (errno == EAGAIN) {
 254                 if (got) {
 255                     return got;
 256                 } else {
 257                     return QIO_CHANNEL_ERR_BLOCK;
 258                 }
 259             }
 260
 261             error_setg_errno(errp, errno,
 262                              "Cannot read from TLS channel");
 263             return -1;
 264         }
 265         got += ret;
 266         if (ret < iov[i].iov_len) {
 267             break;
 268         }
 269     }
 270     return got;
 271 }
 272
 273
 274 static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
 275                                       const struct iovec *iov,
 276                                       size_t niov,
 277                                       int *fds,
 278                                       size_t nfds,
 279                                       Error **errp)
 280 {
 281     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 282     size_t i;
 283     ssize_t done = 0;
 284
 285     for (i = 0 ; i < niov ; i++) {
 286         ssize_t ret = qcrypto_tls_session_write(tioc->session,
 287                                                 iov[i].iov_base,
 288                                                 iov[i].iov_len);
 289         if (ret <= 0) {
 290             if (errno == EAGAIN) {
 291                 if (done) {
 292                     return done;
 293                 } else {
 294                     return QIO_CHANNEL_ERR_BLOCK;
 295                 }
 296             }
 297
 298             error_setg_errno(errp, errno,
 299                              "Cannot write to TLS channel");
 300             return -1;
 301         }
 302         done += ret;
 303         if (ret < iov[i].iov_len) {
 304             break;
 305         }
 306     }
 307     return done;
 308 }
 309
 310 static int qio_channel_tls_set_blocking(QIOChannel *ioc,
 311                                         bool enabled,
 312                                         Error **errp)
 313 {
 314     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 315
 316     return qio_channel_set_blocking(tioc->master, enabled, errp);
 317 }
 318
 319 static void qio_channel_tls_set_delay(QIOChannel *ioc,
 320                                       bool enabled)
 321 {
 322     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 323
 324     qio_channel_set_delay(tioc->master, enabled);
 325 }
 326
 327 static void qio_channel_tls_set_cork(QIOChannel *ioc,
 328                                      bool enabled)
 329 {
 330     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 331
 332     qio_channel_set_cork(tioc->master, enabled);
 333 }
 334
 335 static int qio_channel_tls_shutdown(QIOChannel *ioc,
 336                                     QIOChannelShutdown how,
 337                                     Error **errp)
 338 {
 339     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 340
 341     return qio_channel_shutdown(tioc->master, how, errp);
 342 }
 343
 344 static int qio_channel_tls_close(QIOChannel *ioc,
 345                                  Error **errp)
 346 {
 347     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 348
 349     return qio_channel_close(tioc->master, errp);
 350 }
 351
 352 static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
 353                                              GIOCondition condition)
 354 {
 355     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 356
 357     return qio_channel_create_watch(tioc->master, condition);
 358 }
 359
 360 QCryptoTLSSession *
 361 qio_channel_tls_get_session(QIOChannelTLS *ioc)
 362 {
 363     return ioc->session;
 364 }
 365
 366 static void qio_channel_tls_class_init(ObjectClass *klass,
 367                                        void *class_data G_GNUC_UNUSED)
 368 {
 369     QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
 370
 371     ioc_klass->io_writev = qio_channel_tls_writev;
 372     ioc_klass->io_readv = qio_channel_tls_readv;
 373     ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
 374     ioc_klass->io_set_delay = qio_channel_tls_set_delay;
 375     ioc_klass->io_set_cork = qio_channel_tls_set_cork;
 376     ioc_klass->io_close = qio_channel_tls_close;
 377     ioc_klass->io_shutdown = qio_channel_tls_shutdown;
 378     ioc_klass->io_create_watch = qio_channel_tls_create_watch;
 379 }
 380
 381 static const TypeInfo qio_channel_tls_info = {
 382     .parent = TYPE_QIO_CHANNEL,
 383     .name = TYPE_QIO_CHANNEL_TLS,
 384     .instance_size = sizeof(QIOChannelTLS),
 385     .instance_init = qio_channel_tls_init,
 386     .instance_finalize = qio_channel_tls_finalize,
 387     .class_init = qio_channel_tls_class_init,
 388 };
 389
 390 static void qio_channel_tls_register_types(void)
 391 {
 392     type_register_static(&qio_channel_tls_info);
 393 }
 394
 395 type_init(qio_channel_tls_register_types);