LXR qemu/crypto/init.c

   1/*
   2 * QEMU Crypto initialization
   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 "crypto/init.h"
  23#include "qapi/error.h"
  24#include "qemu/thread.h"
  25
  26#ifdef CONFIG_GNUTLS
  27#include <gnutls/gnutls.h>
  28#include <gnutls/crypto.h>
  29#endif
  30
  31#ifdef CONFIG_GCRYPT
  32#include <gcrypt.h>
  33#endif
  34
  35/* #define DEBUG_GNUTLS */
  36
  37/*
  38 * If GNUTLS is built against GCrypt then
  39 *
  40 *  - When GNUTLS >= 2.12, we must not initialize gcrypt threading
  41 *    because GNUTLS will do that itself
  42 *  - When GNUTLS < 2.12 we must always initialize gcrypt threading
  43 *  - When GNUTLS is disabled we must always initialize gcrypt threading
  44 *
  45 * But....
  46 *
  47 *    When gcrypt >= 1.6.0 we must not initialize gcrypt threading
  48 *    because gcrypt will do that itself.
  49 *
  50 * So we need to init gcrypt threading if
  51 *
  52 *   - gcrypt < 1.6.0
  53 * AND
  54 *      - gnutls < 2.12
  55 *   OR
  56 *      - gnutls is disabled
  57 *
  58 */
  59
  60#if (defined(CONFIG_GCRYPT) &&                  \
  61     (!defined(CONFIG_GNUTLS) ||                \
  62      !defined(GNUTLS_VERSION_NUMBER) ||       \
  63      (GNUTLS_VERSION_NUMBER < 0x020c00)) &&    \
  64     (!defined(GCRYPT_VERSION_NUMBER) ||        \
  65      (GCRYPT_VERSION_NUMBER < 0x010600)))
  66#define QCRYPTO_INIT_GCRYPT_THREADS
  67#else
  68#undef QCRYPTO_INIT_GCRYPT_THREADS
  69#endif
  70
  71#ifdef DEBUG_GNUTLS
  72static void qcrypto_gnutls_log(int level, const char *str)
  73{
  74    fprintf(stderr, "%d: %s", level, str);
  75}
  76#endif
  77
  78#ifdef QCRYPTO_INIT_GCRYPT_THREADS
  79static int qcrypto_gcrypt_mutex_init(void **priv)
  80{                                                                             \
  81    QemuMutex *lock = NULL;
  82    lock = g_new0(QemuMutex, 1);
  83    qemu_mutex_init(lock);
  84    *priv = lock;
  85    return 0;
  86}
  87
  88static int qcrypto_gcrypt_mutex_destroy(void **priv)
  89{
  90    QemuMutex *lock = *priv;
  91    qemu_mutex_destroy(lock);
  92    g_free(lock);
  93    return 0;
  94}
  95
  96static int qcrypto_gcrypt_mutex_lock(void **priv)
  97{
  98    QemuMutex *lock = *priv;
  99    qemu_mutex_lock(lock);
 100    return 0;
 101}
 102
 103static int qcrypto_gcrypt_mutex_unlock(void **priv)
 104{
 105    QemuMutex *lock = *priv;
 106    qemu_mutex_unlock(lock);
 107    return 0;
 108}
 109
 110static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
 111    (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
 112    NULL,
 113    qcrypto_gcrypt_mutex_init,
 114    qcrypto_gcrypt_mutex_destroy,
 115    qcrypto_gcrypt_mutex_lock,
 116    qcrypto_gcrypt_mutex_unlock,
 117    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 118};
 119#endif /* QCRYPTO_INIT_GCRYPT */
 120
 121int qcrypto_init(Error **errp)
 122{
 123#ifdef CONFIG_GNUTLS
 124    int ret;
 125    ret = gnutls_global_init();
 126    if (ret < 0) {
 127        error_setg(errp,
 128                   "Unable to initialize GNUTLS library: %s",
 129                   gnutls_strerror(ret));
 130        return -1;
 131    }
 132#ifdef DEBUG_GNUTLS
 133    gnutls_global_set_log_level(10);
 134    gnutls_global_set_log_function(qcrypto_gnutls_log);
 135#endif
 136#endif
 137
 138#ifdef CONFIG_GCRYPT
 139    if (!gcry_check_version(GCRYPT_VERSION)) {
 140        error_setg(errp, "Unable to initialize gcrypt");
 141        return -1;
 142    }
 143#ifdef QCRYPTO_INIT_GCRYPT_THREADS
 144    gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
 145#endif /* QCRYPTO_INIT_GCRYPT_THREADS */
 146    gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
 147#endif
 148
 149    return 0;
 150}
 151