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_set_error(task, err);
 157         qio_task_complete(task);
 158         return;
 159     }
 160
 161     status = qcrypto_tls_session_get_handshake_status(ioc->session);
 162     if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
 163         trace_qio_channel_tls_handshake_complete(ioc);
 164         if (qcrypto_tls_session_check_credentials(ioc->session,
 165                                                   &err) < 0) {
 166             trace_qio_channel_tls_credentials_deny(ioc);
 167             qio_task_set_error(task, err);
 168         } else {
 169             trace_qio_channel_tls_credentials_allow(ioc);
 170         }
 171         qio_task_complete(task);
 172     } else {
 173         GIOCondition condition;
 174         if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) {
 175             condition = G_IO_OUT;
 176         } else {
 177             condition = G_IO_IN;
 178         }
 179
 180         trace_qio_channel_tls_handshake_pending(ioc, status);
 181         qio_channel_add_watch(ioc->master,
 182                               condition,
 183                               qio_channel_tls_handshake_io,
 184                               task,
 185                               NULL);
 186     }
 187 }
 188
 189
 190 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
 191                                              GIOCondition condition,
 192                                              gpointer user_data)
 193 {
 194     QIOTask *task = user_data;
 195     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
 196         qio_task_get_source(task));
 197
 198     qio_channel_tls_handshake_task(
 199        tioc, task);
 200
 201     return FALSE;
 202 }
 203
 204 void qio_channel_tls_handshake(QIOChannelTLS *ioc,
 205                                QIOTaskFunc func,
 206                                gpointer opaque,
 207                                GDestroyNotify destroy)
 208 {
 209     QIOTask *task;
 210
 211     task = qio_task_new(OBJECT(ioc),
 212                         func, opaque, destroy);
 213
 214     trace_qio_channel_tls_handshake_start(ioc);
 215     qio_channel_tls_handshake_task(ioc, task);
 216 }
 217
 218
 219 static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
 220 {
 221 }
 222
 223
 224 static void qio_channel_tls_finalize(Object *obj)
 225 {
 226     QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
 227
 228     object_unref(OBJECT(ioc->master));
 229     qcrypto_tls_session_free(ioc->session);
 230 }
 231
 232
 233 static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
 234                                      const struct iovec *iov,
 235                                      size_t niov,
 236                                      int **fds,
 237                                      size_t *nfds,
 238                                      Error **errp)
 239 {
 240     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 241     size_t i;
 242     ssize_t got = 0;
 243
 244     for (i = 0 ; i < niov ; i++) {
 245         ssize_t ret = qcrypto_tls_session_read(tioc->session,
 246                                                iov[i].iov_base,
 247                                                iov[i].iov_len);
 248         if (ret < 0) {
 249             if (errno == EAGAIN) {
 250                 if (got) {
 251                     return got;
 252                 } else {
 253                     return QIO_CHANNEL_ERR_BLOCK;
 254                 }
 255             }
 256
 257             error_setg_errno(errp, errno,
 258                              "Cannot read from TLS channel");
 259             return -1;
 260         }
 261         got += ret;
 262         if (ret < iov[i].iov_len) {
 263             break;
 264         }
 265     }
 266     return got;
 267 }
 268
 269
 270 static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
 271                                       const struct iovec *iov,
 272                                       size_t niov,
 273                                       int *fds,
 274                                       size_t nfds,
 275                                       Error **errp)
 276 {
 277     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 278     size_t i;
 279     ssize_t done = 0;
 280
 281     for (i = 0 ; i < niov ; i++) {
 282         ssize_t ret = qcrypto_tls_session_write(tioc->session,
 283                                                 iov[i].iov_base,
 284                                                 iov[i].iov_len);
 285         if (ret <= 0) {
 286             if (errno == EAGAIN) {
 287                 if (done) {
 288                     return done;
 289                 } else {
 290                     return QIO_CHANNEL_ERR_BLOCK;
 291                 }
 292             }
 293
 294             error_setg_errno(errp, errno,
 295                              "Cannot write to TLS channel");
 296             return -1;
 297         }
 298         done += ret;
 299         if (ret < iov[i].iov_len) {
 300             break;
 301         }
 302     }
 303     return done;
 304 }
 305
 306 static int qio_channel_tls_set_blocking(QIOChannel *ioc,
 307                                         bool enabled,
 308                                         Error **errp)
 309 {
 310     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 311
 312     return qio_channel_set_blocking(tioc->master, enabled, errp);
 313 }
 314
 315 static void qio_channel_tls_set_delay(QIOChannel *ioc,
 316                                       bool enabled)
 317 {
 318     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 319
 320     qio_channel_set_delay(tioc->master, enabled);
 321 }
 322
 323 static void qio_channel_tls_set_cork(QIOChannel *ioc,
 324                                      bool enabled)
 325 {
 326     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 327
 328     qio_channel_set_cork(tioc->master, enabled);
 329 }
 330
 331 static int qio_channel_tls_shutdown(QIOChannel *ioc,
 332                                     QIOChannelShutdown how,
 333                                     Error **errp)
 334 {
 335     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 336
 337     return qio_channel_shutdown(tioc->master, how, errp);
 338 }
 339
 340 static int qio_channel_tls_close(QIOChannel *ioc,
 341                                  Error **errp)
 342 {
 343     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 344
 345     return qio_channel_close(tioc->master, errp);
 346 }
 347
 348 static void qio_channel_tls_set_aio_fd_handler(QIOChannel *ioc,
 349                                                AioContext *ctx,
 350                                                IOHandler *io_read,
 351                                                IOHandler *io_write,
 352                                                void *opaque)
 353 {
 354     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 355
 356     qio_channel_set_aio_fd_handler(tioc->master, ctx, io_read, io_write, opaque);
 357 }
 358
 359 static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
 360                                              GIOCondition condition)
 361 {
 362     QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
 363
 364     return qio_channel_create_watch(tioc->master, condition);
 365 }
 366
 367 QCryptoTLSSession *
 368 qio_channel_tls_get_session(QIOChannelTLS *ioc)
 369 {
 370     return ioc->session;
 371 }
 372
 373 static void qio_channel_tls_class_init(ObjectClass *klass,
 374                                        void *class_data G_GNUC_UNUSED)
 375 {
 376     QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
 377
 378     ioc_klass->io_writev = qio_channel_tls_writev;
 379     ioc_klass->io_readv = qio_channel_tls_readv;
 380     ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
 381     ioc_klass->io_set_delay = qio_channel_tls_set_delay;
 382     ioc_klass->io_set_cork = qio_channel_tls_set_cork;
 383     ioc_klass->io_close = qio_channel_tls_close;
 384     ioc_klass->io_shutdown = qio_channel_tls_shutdown;
 385     ioc_klass->io_create_watch = qio_channel_tls_create_watch;
 386     ioc_klass->io_set_aio_fd_handler = qio_channel_tls_set_aio_fd_handler;
 387 }
 388
 389 static const TypeInfo qio_channel_tls_info = {
 390     .parent = TYPE_QIO_CHANNEL,
 391     .name = TYPE_QIO_CHANNEL_TLS,
 392     .instance_size = sizeof(QIOChannelTLS),
 393     .instance_init = qio_channel_tls_init,
 394     .instance_finalize = qio_channel_tls_finalize,
 395     .class_init = qio_channel_tls_class_init,
 396 };
 397
 398 static void qio_channel_tls_register_types(void)
 399 {
 400     type_register_static(&qio_channel_tls_info);
 401 }
 402
 403 type_init(qio_channel_tls_register_types);