migration: split migration hooks out of QEMUFileOps
[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 !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 }