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