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