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 #include "crypto/random.h"
  36
  37 /* #define DEBUG_GNUTLS */
  38
  39 /*
  40  * We need to init gcrypt threading if
  41  *
  42  *   - gcrypt < 1.6.0
  43  *
  44  */
  45
  46 #if (defined(CONFIG_GCRYPT) &&                  \
  47      (!defined(GCRYPT_VERSION_NUMBER) ||        \
  48       (GCRYPT_VERSION_NUMBER < 0x010600)))
  49 #define QCRYPTO_INIT_GCRYPT_THREADS
  50 #else
  51 #undef QCRYPTO_INIT_GCRYPT_THREADS
  52 #endif
  53
  54 #ifdef DEBUG_GNUTLS
  55 static void qcrypto_gnutls_log(int level, const char *str)
  56 {
  57     fprintf(stderr, "%d: %s", level, str);
  58 }
  59 #endif
  60
  61 #ifdef QCRYPTO_INIT_GCRYPT_THREADS
  62 static int qcrypto_gcrypt_mutex_init(void **priv)
  63 {                                                                             \
  64     QemuMutex *lock = NULL;
  65     lock = g_new0(QemuMutex, 1);
  66     qemu_mutex_init(lock);
  67     *priv = lock;
  68     return 0;
  69 }
  70
  71 static int qcrypto_gcrypt_mutex_destroy(void **priv)
  72 {
  73     QemuMutex *lock = *priv;
  74     qemu_mutex_destroy(lock);
  75     g_free(lock);
  76     return 0;
  77 }
  78
  79 static int qcrypto_gcrypt_mutex_lock(void **priv)
  80 {
  81     QemuMutex *lock = *priv;
  82     qemu_mutex_lock(lock);
  83     return 0;
  84 }
  85
  86 static int qcrypto_gcrypt_mutex_unlock(void **priv)
  87 {
  88     QemuMutex *lock = *priv;
  89     qemu_mutex_unlock(lock);
  90     return 0;
  91 }
  92
  93 static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
  94     (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
  95     NULL,
  96     qcrypto_gcrypt_mutex_init,
  97     qcrypto_gcrypt_mutex_destroy,
  98     qcrypto_gcrypt_mutex_lock,
  99     qcrypto_gcrypt_mutex_unlock,
 100     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 101 };
 102 #endif /* QCRYPTO_INIT_GCRYPT */
 103
 104 int qcrypto_init(Error **errp)
 105 {
 106 #ifdef QCRYPTO_INIT_GCRYPT_THREADS
 107     gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
 108 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */
 109
 110 #ifdef CONFIG_GNUTLS
 111     int ret;
 112     ret = gnutls_global_init();
 113     if (ret < 0) {
 114         error_setg(errp,
 115                    "Unable to initialize GNUTLS library: %s",
 116                    gnutls_strerror(ret));
 117         return -1;
 118     }
 119 #ifdef DEBUG_GNUTLS
 120     gnutls_global_set_log_level(10);
 121     gnutls_global_set_log_function(qcrypto_gnutls_log);
 122 #endif
 123 #endif
 124
 125 #ifdef CONFIG_GCRYPT
 126     if (!gcry_check_version(GCRYPT_VERSION)) {
 127         error_setg(errp, "Unable to initialize gcrypt");
 128         return -1;
 129     }
 130     gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
 131 #endif
 132
 133     if (qcrypto_random_init(errp) < 0) {
 134         return -1;
 135     }
 136
 137     return 0;
 138 }