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 "crypto/init.h" 22 #include "qemu/thread.h" 23 24 #ifdef CONFIG_GNUTLS 25 #include <gnutls/gnutls.h> 26 #include <gnutls/crypto.h> 27 #endif 28 29 #ifdef CONFIG_GCRYPT 30 #include <gcrypt.h> 31 #endif 32 33 /* #define DEBUG_GNUTLS */ 34 35 /* 36 * If GNUTLS is built against GCrypt then 37 * 38 * - When GNUTLS >= 2.12, we must not initialize gcrypt threading 39 * because GNUTLS will do that itself 40 * - When GNUTLS < 2.12 we must always initialize gcrypt threading 41 * - When GNUTLS is disabled we must always initialize gcrypt threading 42 * 43 * But.... 44 * 45 * When gcrypt >= 1.6.0 we must not initialize gcrypt threading 46 * because gcrypt will do that itself. 47 * 48 * So we need to init gcrypt threading if 49 * 50 * - gcrypt < 1.6.0 51 * AND 52 * - gnutls < 2.12 53 * OR 54 * - gnutls is disabled 55 * 56 */ 57 58 #if (defined(CONFIG_GCRYPT) && \ 59 (!defined(CONFIG_GNUTLS) || \ 60 !defined(GNUTLS_VERSION_NUMBER) || \ 61 (GNUTLS_VERSION_NUMBER < 0x020c00)) && \ 62 (!defined(GCRYPT_VERSION_NUMBER) || \ 63 (GCRYPT_VERSION_NUMBER < 0x010600))) 64 #define QCRYPTO_INIT_GCRYPT_THREADS 65 #else 66 #undef QCRYPTO_INIT_GCRYPT_THREADS 67 #endif 68 69 #ifdef DEBUG_GNUTLS 70 static void qcrypto_gnutls_log(int level, const char *str) 71 { 72 fprintf(stderr, "%d: %s", level, str); 73 } 74 #endif 75 76 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 77 static int qcrypto_gcrypt_mutex_init(void **priv) 78 { \ 79 QemuMutex *lock = NULL; 80 lock = g_new0(QemuMutex, 1); 81 qemu_mutex_init(lock); 82 *priv = lock; 83 return 0; 84 } 85 86 static int qcrypto_gcrypt_mutex_destroy(void **priv) 87 { 88 QemuMutex *lock = *priv; 89 qemu_mutex_destroy(lock); 90 g_free(lock); 91 return 0; 92 } 93 94 static int qcrypto_gcrypt_mutex_lock(void **priv) 95 { 96 QemuMutex *lock = *priv; 97 qemu_mutex_lock(lock); 98 return 0; 99 } 100 101 static int qcrypto_gcrypt_mutex_unlock(void **priv) 102 { 103 QemuMutex *lock = *priv; 104 qemu_mutex_unlock(lock); 105 return 0; 106 } 107 108 static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = { 109 (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)), 110 NULL, 111 qcrypto_gcrypt_mutex_init, 112 qcrypto_gcrypt_mutex_destroy, 113 qcrypto_gcrypt_mutex_lock, 114 qcrypto_gcrypt_mutex_unlock, 115 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 116 }; 117 #endif /* QCRYPTO_INIT_GCRYPT */ 118 119 int qcrypto_init(Error **errp) 120 { 121 #ifdef CONFIG_GNUTLS 122 int ret; 123 ret = gnutls_global_init(); 124 if (ret < 0) { 125 error_setg(errp, 126 "Unable to initialize GNUTLS library: %s", 127 gnutls_strerror(ret)); 128 return -1; 129 } 130 #ifdef DEBUG_GNUTLS 131 gnutls_global_set_log_level(10); 132 gnutls_global_set_log_function(qcrypto_gnutls_log); 133 #endif 134 #endif 135 136 #ifdef CONFIG_GCRYPT 137 if (!gcry_check_version(GCRYPT_VERSION)) { 138 error_setg(errp, "Unable to initialize gcrypt"); 139 return -1; 140 } 141 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 142 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl); 143 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */ 144 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); 145 #endif 146 147 return 0; 148 } 149