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 28 #ifdef CONFIG_GNUTLS_GCRYPT 29 #include <gcrypt.h> 30 #endif 31 32 /* #define DEBUG_GNUTLS */ 33 34 /* 35 * If GNUTLS is built against GCrypt then 36 * 37 * - When GNUTLS >= 2.12, we must not initialize gcrypt threading 38 * because GNUTLS will do that itself 39 * - When GNUTLS < 2.12 we must always initialize gcrypt threading 40 * 41 * But.... 42 * 43 * When gcrypt >= 1.6.0 we must not initialize gcrypt threading 44 * because gcrypt will do that itself. 45 * 46 * So we need to init gcrypt threading if 47 * 48 * - gcrypt < 1.6.0 49 * AND 50 * - gnutls < 2.12 51 * 52 */ 53 54 #if (defined(CONFIG_GNUTLS_GCRYPT) && \ 55 (!defined(GNUTLS_VERSION_NUMBER) || \ 56 (GNUTLS_VERSION_NUMBER < 0x020c00)) && \ 57 (!defined(GCRYPT_VERSION_NUMBER) || \ 58 (GCRYPT_VERSION_NUMBER < 0x010600))) 59 #define QCRYPTO_INIT_GCRYPT_THREADS 60 #else 61 #undef QCRYPTO_INIT_GCRYPT_THREADS 62 #endif 63 64 #ifdef DEBUG_GNUTLS 65 static void qcrypto_gnutls_log(int level, const char *str) 66 { 67 fprintf(stderr, "%d: %s", level, str); 68 } 69 #endif 70 71 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 72 static int qcrypto_gcrypt_mutex_init(void **priv) 73 { \ 74 QemuMutex *lock = NULL; 75 lock = g_new0(QemuMutex, 1); 76 qemu_mutex_init(lock); 77 *priv = lock; 78 return 0; 79 } 80 81 static int qcrypto_gcrypt_mutex_destroy(void **priv) 82 { 83 QemuMutex *lock = *priv; 84 qemu_mutex_destroy(lock); 85 g_free(lock); 86 return 0; 87 } 88 89 static int qcrypto_gcrypt_mutex_lock(void **priv) 90 { 91 QemuMutex *lock = *priv; 92 qemu_mutex_lock(lock); 93 return 0; 94 } 95 96 static int qcrypto_gcrypt_mutex_unlock(void **priv) 97 { 98 QemuMutex *lock = *priv; 99 qemu_mutex_unlock(lock); 100 return 0; 101 } 102 103 static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = { 104 (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)), 105 NULL, 106 qcrypto_gcrypt_mutex_init, 107 qcrypto_gcrypt_mutex_destroy, 108 qcrypto_gcrypt_mutex_lock, 109 qcrypto_gcrypt_mutex_unlock, 110 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 111 }; 112 #endif /* QCRYPTO_INIT_GCRYPT */ 113 114 int qcrypto_init(Error **errp) 115 { 116 int ret; 117 ret = gnutls_global_init(); 118 if (ret < 0) { 119 error_setg(errp, 120 "Unable to initialize GNUTLS library: %s", 121 gnutls_strerror(ret)); 122 return -1; 123 } 124 #ifdef DEBUG_GNUTLS 125 gnutls_global_set_log_level(10); 126 gnutls_global_set_log_function(qcrypto_gnutls_log); 127 #endif 128 129 #ifdef CONFIG_GNUTLS_GCRYPT 130 if (!gcry_check_version(GCRYPT_VERSION)) { 131 error_setg(errp, "Unable to initialize gcrypt"); 132 return -1; 133 } 134 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 135 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl); 136 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */ 137 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); 138 #endif 139 140 return 0; 141 } 142 143 #else /* ! CONFIG_GNUTLS */ 144 145 int qcrypto_init(Error **errp G_GNUC_UNUSED) 146 { 147 return 0; 148 } 149 150 #endif /* ! CONFIG_GNUTLS */ 151