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     return FALSE;
 204 }
 205
 206 void qio_channel_tls_handshake(QIOChannelTLS *ioc,
 207                                QIOTaskFunc func,
 208                                gpointer opaque,
 209                                GDestroyNotify destroy)
 210 {
 211     QIOTask *task;
 212
 213     task = qio_task_new(OBJECT(ioc),
 214                         func, opaque, destroy);
 215
 216     trace_qio_channel_tls_handshake_start(ioc);
 217     qio_channel_tls_handshake_task(ioc, task);
 218 }
 219
 220
 221 static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
 222 {
 223 }
 224
 225
 226 static void qio_channel_tls_finalize(Object *obj)
 227 {
 228     QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
 229
 230     object_unref(OBJECT(ioc->master));
 231     qcrypto_tls_session_free(ioc->session);
 232 }
 233
 234
 235 static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
 236                                      const struct iovec *iov,
 237                                      size_t niov,
 238                                      int **fds,
 239                                      size_t *nfds,
 240                                      Error **errp)
 241 {
 242     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 243     size_t i;
 244     ssize_t got = 0;
 245
 246     for (i = 0 ; i < niov ; i++) {
 247         ssize_t ret = qcrypto_tls_session_read(tioc->session,
 248                                                iov[i].iov_base,
 249                                                iov[i].iov_len);
 250         if (ret < 0) {
 251             if (errno == EAGAIN) {
 252                 if (got) {
 253                     return got;
 254                 } else {
 255                     return QIO_CHANNEL_ERR_BLOCK;
 256                 }
 257             }
 258
 259             error_setg_errno(errp, errno,
 260                              "Cannot read from TLS channel");
 261             return -1;
 262         }
 263         got += ret;
 264         if (ret < iov[i].iov_len) {
 265             break;
 266         }
 267     }
 268     return got;
 269 }
 270
 271
 272 static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
 273                                       const struct iovec *iov,
 274                                       size_t niov,
 275                                       int *fds,
 276                                       size_t nfds,
 277                                       Error **errp)
 278 {
 279     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 280     size_t i;
 281     ssize_t done = 0;
 282
 283     for (i = 0 ; i < niov ; i++) {
 284         ssize_t ret = qcrypto_tls_session_write(tioc->session,
 285                                                 iov[i].iov_base,
 286                                                 iov[i].iov_len);
 287         if (ret <= 0) {
 288             if (errno == EAGAIN) {
 289                 if (done) {
 290                     return done;
 291                 } else {
 292                     return QIO_CHANNEL_ERR_BLOCK;
 293                 }
 294             }
 295
 296             error_setg_errno(errp, errno,
 297                              "Cannot write to TLS channel");
 298             return -1;
 299         }
 300         done += ret;
 301         if (ret < iov[i].iov_len) {
 302             break;
 303         }
 304     }
 305     return done;
 306 }
 307
 308 static int qio_channel_tls_set_blocking(QIOChannel *ioc,
 309                                         bool enabled,
 310                                         Error **errp)
 311 {
 312     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 313
 314     return qio_channel_set_blocking(tioc->master, enabled, errp);
 315 }
 316
 317 static void qio_channel_tls_set_delay(QIOChannel *ioc,
 318                                       bool enabled)
 319 {
 320     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 321
 322     qio_channel_set_delay(tioc->master, enabled);
 323 }
 324
 325 static void qio_channel_tls_set_cork(QIOChannel *ioc,
 326                                      bool enabled)
 327 {
 328     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 329
 330     qio_channel_set_cork(tioc->master, enabled);
 331 }
 332
 333 static int qio_channel_tls_shutdown(QIOChannel *ioc,
 334                                     QIOChannelShutdown how,
 335                                     Error **errp)
 336 {
 337     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 338
 339     return qio_channel_shutdown(tioc->master, how, errp);
 340 }
 341
 342 static int qio_channel_tls_close(QIOChannel *ioc,
 343                                  Error **errp)
 344 {
 345     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 346
 347     return qio_channel_close(tioc->master, errp);
 348 }
 349
 350 static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
 351                                              GIOCondition condition)
 352 {
 353     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 354
 355     return qio_channel_create_watch(tioc->master, condition);
 356 }
 357
 358 QCryptoTLSSession *
 359 qio_channel_tls_get_session(QIOChannelTLS *ioc)
 360 {
 361     return ioc->session;
 362 }
 363
 364 static void qio_channel_tls_class_init(ObjectClass *klass,
 365                                        void *class_data G_GNUC_UNUSED)
 366 {
 367     QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
 368
 369     ioc_klass->io_writev = qio_channel_tls_writev;
 370     ioc_klass->io_readv = qio_channel_tls_readv;
 371     ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
 372     ioc_klass->io_set_delay = qio_channel_tls_set_delay;
 373     ioc_klass->io_set_cork = qio_channel_tls_set_cork;
 374     ioc_klass->io_close = qio_channel_tls_close;
 375     ioc_klass->io_shutdown = qio_channel_tls_shutdown;
 376     ioc_klass->io_create_watch = qio_channel_tls_create_watch;
 377 }
 378
 379 static const TypeInfo qio_channel_tls_info = {
 380     .parent = TYPE_QIO_CHANNEL,
 381     .name = TYPE_QIO_CHANNEL_TLS,
 382     .instance_size = sizeof(QIOChannelTLS),
 383     .instance_init = qio_channel_tls_init,
 384     .instance_finalize = qio_channel_tls_finalize,
 385     .class_init = qio_channel_tls_class_init,
 386 };
 387
 388 static void qio_channel_tls_register_types(void)
 389 {
 390     type_register_static(&qio_channel_tls_info);
 391 }
 392
 393 type_init(qio_channel_tls_register_types);