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 * If GNUTLS is built against GCrypt then 41 * 42 * - When GNUTLS >= 2.12, we must not initialize gcrypt threading 43 * because GNUTLS will do that itself 44 * - When GNUTLS < 2.12 we must always initialize gcrypt threading 45 * - When GNUTLS is disabled we must always initialize gcrypt threading 46 * 47 * But.... 48 * 49 * When gcrypt >= 1.6.0 we must not initialize gcrypt threading 50 * because gcrypt will do that itself. 51 * 52 * So we need to init gcrypt threading if 53 * 54 * - gcrypt < 1.6.0 55 * AND 56 * - gnutls < 2.12 57 * OR 58 * - gnutls is disabled 59 * 60 */ 61 62 #if (defined(CONFIG_GCRYPT) && \ 63 (!defined(CONFIG_GNUTLS) || \ 64 (LIBGNUTLS_VERSION_NUMBER < 0x020c00)) && \ 65 (!defined(GCRYPT_VERSION_NUMBER) || \ 66 (GCRYPT_VERSION_NUMBER < 0x010600))) 67 #define QCRYPTO_INIT_GCRYPT_THREADS 68 #else 69 #undef QCRYPTO_INIT_GCRYPT_THREADS 70 #endif 71 72 #ifdef DEBUG_GNUTLS 73 static void qcrypto_gnutls_log(int level, const char *str) 74 { 75 fprintf(stderr, "%d: %s", level, str); 76 } 77 #endif 78 79 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 80 static int qcrypto_gcrypt_mutex_init(void **priv) 81 { \ 82 QemuMutex *lock = NULL; 83 lock = g_new0(QemuMutex, 1); 84 qemu_mutex_init(lock); 85 *priv = lock; 86 return 0; 87 } 88 89 static int qcrypto_gcrypt_mutex_destroy(void **priv) 90 { 91 QemuMutex *lock = *priv; 92 qemu_mutex_destroy(lock); 93 g_free(lock); 94 return 0; 95 } 96 97 static int qcrypto_gcrypt_mutex_lock(void **priv) 98 { 99 QemuMutex *lock = *priv; 100 qemu_mutex_lock(lock); 101 return 0; 102 } 103 104 static int qcrypto_gcrypt_mutex_unlock(void **priv) 105 { 106 QemuMutex *lock = *priv; 107 qemu_mutex_unlock(lock); 108 return 0; 109 } 110 111 static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = { 112 (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)), 113 NULL, 114 qcrypto_gcrypt_mutex_init, 115 qcrypto_gcrypt_mutex_destroy, 116 qcrypto_gcrypt_mutex_lock, 117 qcrypto_gcrypt_mutex_unlock, 118 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 119 }; 120 #endif /* QCRYPTO_INIT_GCRYPT */ 121 122 int qcrypto_init(Error **errp) 123 { 124 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 125 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl); 126 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */ 127 128 #ifdef CONFIG_GNUTLS 129 int ret; 130 ret = gnutls_global_init(); 131 if (ret < 0) { 132 error_setg(errp, 133 "Unable to initialize GNUTLS library: %s", 134 gnutls_strerror(ret)); 135 return -1; 136 } 137 #ifdef DEBUG_GNUTLS 138 gnutls_global_set_log_level(10); 139 gnutls_global_set_log_function(qcrypto_gnutls_log); 140 #endif 141 #endif 142 143 #ifdef CONFIG_GCRYPT 144 if (!gcry_check_version(GCRYPT_VERSION)) { 145 error_setg(errp, "Unable to initialize gcrypt"); 146 return -1; 147 } 148 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); 149 #endif 150 151 if (qcrypto_random_init(errp) < 0) { 152 return -1; 153 } 154 155 return 0; 156 } 157