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 72 static 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 79 static 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 88 static 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 96 static int qcrypto_gcrypt_mutex_lock(void **priv) 97 { 98 QemuMutex *lock = *priv; 99 qemu_mutex_lock(lock); 100 return 0; 101 } 102 103 static int qcrypto_gcrypt_mutex_unlock(void **priv) 104 { 105 QemuMutex *lock = *priv; 106 qemu_mutex_unlock(lock); 107 return 0; 108 } 109 110 static 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 */ 120 121 int 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