Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[qemu.git] / crypto / init.c
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 (LIBGNUTLS_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 QCRYPTO_INIT_GCRYPT_THREADS
123 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
124 #endif /* QCRYPTO_INIT_GCRYPT_THREADS */
125
126 #ifdef CONFIG_GNUTLS
127 int ret;
128 ret = gnutls_global_init();
129 if (ret < 0) {
130 error_setg(errp,
131 "Unable to initialize GNUTLS library: %s",
132 gnutls_strerror(ret));
133 return -1;
134 }
135 #ifdef DEBUG_GNUTLS
136 gnutls_global_set_log_level(10);
137 gnutls_global_set_log_function(qcrypto_gnutls_log);
138 #endif
139 #endif
140
141 #ifdef CONFIG_GCRYPT
142 if (!gcry_check_version(GCRYPT_VERSION)) {
143 error_setg(errp, "Unable to initialize gcrypt");
144 return -1;
145 }
146 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
147 #endif
148
149 return 0;
150 }