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 * We need to init gcrypt threading if 41 * 42 * - gcrypt < 1.6.0 43 * 44 */ 45 46 #if (defined(CONFIG_GCRYPT) && \ 47 (GCRYPT_VERSION_NUMBER < 0x010600)) 48 #define QCRYPTO_INIT_GCRYPT_THREADS 49 #else 50 #undef QCRYPTO_INIT_GCRYPT_THREADS 51 #endif 52 53 #ifdef DEBUG_GNUTLS 54 static void qcrypto_gnutls_log(int level, const char *str) 55 { 56 fprintf(stderr, "%d: %s", level, str); 57 } 58 #endif 59 60 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 61 static int qcrypto_gcrypt_mutex_init(void **priv) 62 { \ 63 QemuMutex *lock = NULL; 64 lock = g_new0(QemuMutex, 1); 65 qemu_mutex_init(lock); 66 *priv = lock; 67 return 0; 68 } 69 70 static int qcrypto_gcrypt_mutex_destroy(void **priv) 71 { 72 QemuMutex *lock = *priv; 73 qemu_mutex_destroy(lock); 74 g_free(lock); 75 return 0; 76 } 77 78 static int qcrypto_gcrypt_mutex_lock(void **priv) 79 { 80 QemuMutex *lock = *priv; 81 qemu_mutex_lock(lock); 82 return 0; 83 } 84 85 static int qcrypto_gcrypt_mutex_unlock(void **priv) 86 { 87 QemuMutex *lock = *priv; 88 qemu_mutex_unlock(lock); 89 return 0; 90 } 91 92 static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = { 93 (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)), 94 NULL, 95 qcrypto_gcrypt_mutex_init, 96 qcrypto_gcrypt_mutex_destroy, 97 qcrypto_gcrypt_mutex_lock, 98 qcrypto_gcrypt_mutex_unlock, 99 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 100 }; 101 #endif /* QCRYPTO_INIT_GCRYPT */ 102 103 int qcrypto_init(Error **errp) 104 { 105 #ifdef QCRYPTO_INIT_GCRYPT_THREADS 106 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl); 107 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */ 108 109 #ifdef CONFIG_GNUTLS 110 int ret; 111 ret = gnutls_global_init(); 112 if (ret < 0) { 113 error_setg(errp, 114 "Unable to initialize GNUTLS library: %s", 115 gnutls_strerror(ret)); 116 return -1; 117 } 118 #ifdef DEBUG_GNUTLS 119 gnutls_global_set_log_level(10); 120 gnutls_global_set_log_function(qcrypto_gnutls_log); 121 #endif 122 #endif 123 124 #ifdef CONFIG_GCRYPT 125 if (!gcry_check_version(GCRYPT_VERSION)) { 126 error_setg(errp, "Unable to initialize gcrypt"); 127 return -1; 128 } 129 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); 130 #endif 131 132 if (qcrypto_random_init(errp) < 0) { 133 return -1; 134 } 135 136 return 0; 137 } 138