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a37278169d
If no crypto library is included in the build, QEMU uses qcrypto_random_bytes() to generate random data. That function tried to open /dev/urandom or /dev/random and if opening both files failed it errored out. Those files obviously do not exist on windows, so there the code uses CryptGenRandom(). Furthermore there was some refactoring and a new function qcrypto_random_init() was introduced. If a proper crypto library (gnutls or libgcrypt) is included in the build, this function does nothing. If neither is included it initializes the (platform specific) handles that are used by qcrypto_random_bytes(). Either: * a handle to /dev/urandom | /dev/random on unix like systems * a handle to a cryptographic service provider on windows Signed-off-by: Geert Martin Ijewski <gm.ijewski@web.de> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/*
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* QEMU Crypto initialization
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "crypto/init.h"
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#include "qapi/error.h"
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#include "qemu/thread.h"
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#ifdef CONFIG_GNUTLS
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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#endif
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#ifdef CONFIG_GCRYPT
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#include <gcrypt.h>
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#endif
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#include "crypto/random.h"
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/* #define DEBUG_GNUTLS */
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/*
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* If GNUTLS is built against GCrypt then
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*
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* - When GNUTLS >= 2.12, we must not initialize gcrypt threading
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* because GNUTLS will do that itself
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* - When GNUTLS < 2.12 we must always initialize gcrypt threading
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* - When GNUTLS is disabled we must always initialize gcrypt threading
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*
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* But....
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*
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* When gcrypt >= 1.6.0 we must not initialize gcrypt threading
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* because gcrypt will do that itself.
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*
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* So we need to init gcrypt threading if
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*
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* - gcrypt < 1.6.0
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* AND
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* - gnutls < 2.12
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* OR
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* - gnutls is disabled
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*
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*/
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#if (defined(CONFIG_GCRYPT) && \
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(!defined(CONFIG_GNUTLS) || \
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(LIBGNUTLS_VERSION_NUMBER < 0x020c00)) && \
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(!defined(GCRYPT_VERSION_NUMBER) || \
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(GCRYPT_VERSION_NUMBER < 0x010600)))
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#define QCRYPTO_INIT_GCRYPT_THREADS
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#else
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#undef QCRYPTO_INIT_GCRYPT_THREADS
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#endif
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#ifdef DEBUG_GNUTLS
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static void qcrypto_gnutls_log(int level, const char *str)
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{
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fprintf(stderr, "%d: %s", level, str);
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}
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#endif
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#ifdef QCRYPTO_INIT_GCRYPT_THREADS
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static int qcrypto_gcrypt_mutex_init(void **priv)
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{ \
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QemuMutex *lock = NULL;
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lock = g_new0(QemuMutex, 1);
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qemu_mutex_init(lock);
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*priv = lock;
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return 0;
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}
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static int qcrypto_gcrypt_mutex_destroy(void **priv)
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{
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QemuMutex *lock = *priv;
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qemu_mutex_destroy(lock);
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g_free(lock);
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return 0;
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}
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static int qcrypto_gcrypt_mutex_lock(void **priv)
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{
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QemuMutex *lock = *priv;
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qemu_mutex_lock(lock);
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return 0;
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}
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static int qcrypto_gcrypt_mutex_unlock(void **priv)
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{
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QemuMutex *lock = *priv;
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qemu_mutex_unlock(lock);
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return 0;
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}
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static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
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(GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
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NULL,
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qcrypto_gcrypt_mutex_init,
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qcrypto_gcrypt_mutex_destroy,
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qcrypto_gcrypt_mutex_lock,
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qcrypto_gcrypt_mutex_unlock,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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#endif /* QCRYPTO_INIT_GCRYPT */
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int qcrypto_init(Error **errp)
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{
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#ifdef QCRYPTO_INIT_GCRYPT_THREADS
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gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
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#endif /* QCRYPTO_INIT_GCRYPT_THREADS */
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#ifdef CONFIG_GNUTLS
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int ret;
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ret = gnutls_global_init();
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if (ret < 0) {
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error_setg(errp,
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"Unable to initialize GNUTLS library: %s",
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gnutls_strerror(ret));
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return -1;
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}
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#ifdef DEBUG_GNUTLS
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gnutls_global_set_log_level(10);
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gnutls_global_set_log_function(qcrypto_gnutls_log);
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#endif
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#endif
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#ifdef CONFIG_GCRYPT
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if (!gcry_check_version(GCRYPT_VERSION)) {
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error_setg(errp, "Unable to initialize gcrypt");
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return -1;
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}
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gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
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#endif
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if (qcrypto_random_init(errp) < 0) {
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return -1;
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}
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return 0;
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}
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