1 /*
2 * QEMU TLS Cipher Suites
3 *
4 * Copyright (c) 2018-2020 Red Hat, Inc.
5 *
6 * Author: Philippe Mathieu-Daudé <philmd@redhat.com>
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include "qemu/osdep.h"
12 #include "qapi/error.h"
13 #include "qom/object_interfaces.h"
14 #include "crypto/tlscreds.h"
15 #include "crypto/tls-cipher-suites.h"
16 #include "hw/nvram/fw_cfg.h"
17 #include "tlscredspriv.h"
18 #include "trace.h"
19
20 struct QCryptoTLSCipherSuites {
21 /* <private> */
22 QCryptoTLSCreds parent_obj;
23 /* <public> */
24 };
25
26 /*
27 * IANA registered TLS ciphers:
28 * https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4
29 */
30 typedef struct {
31 uint8_t data[2];
32 } QEMU_PACKED IANA_TLS_CIPHER;
33
qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites * obj,Error ** errp)34 GByteArray *qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites *obj,
35 Error **errp)
36 {
37 QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(obj);
38 gnutls_priority_t pcache;
39 GByteArray *byte_array;
40 const char *err;
41 size_t i;
42 int ret;
43
44 trace_qcrypto_tls_cipher_suite_priority(creds->priority);
45 ret = gnutls_priority_init(&pcache, creds->priority, &err);
46 if (ret < 0) {
47 error_setg(errp, "Syntax error using priority '%s': %s",
48 creds->priority, gnutls_strerror(ret));
49 return NULL;
50 }
51
52 byte_array = g_byte_array_new();
53
54 for (i = 0;; i++) {
55 unsigned idx;
56 const char *name;
57 IANA_TLS_CIPHER cipher;
58 gnutls_protocol_t protocol;
59 const char *version;
60
61 ret = gnutls_priority_get_cipher_suite_index(pcache, i, &idx);
62 if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
63 break;
64 }
65 if (ret == GNUTLS_E_UNKNOWN_CIPHER_SUITE) {
66 continue;
67 }
68
69 name = gnutls_cipher_suite_info(idx, (unsigned char *)&cipher,
70 NULL, NULL, NULL, &protocol);
71 if (name == NULL) {
72 continue;
73 }
74
75 version = gnutls_protocol_get_name(protocol);
76 g_byte_array_append(byte_array, cipher.data, 2);
77 trace_qcrypto_tls_cipher_suite_info(cipher.data[0],
78 cipher.data[1],
79 version, name);
80 }
81 trace_qcrypto_tls_cipher_suite_count(byte_array->len);
82 gnutls_priority_deinit(pcache);
83
84 return byte_array;
85 }
86
qcrypto_tls_cipher_suites_complete(UserCreatable * uc,Error ** errp)87 static void qcrypto_tls_cipher_suites_complete(UserCreatable *uc,
88 Error **errp)
89 {
90 QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(uc);
91
92 if (!creds->priority) {
93 error_setg(errp, "'priority' property is not set");
94 return;
95 }
96 }
97
qcrypto_tls_cipher_suites_fw_cfg_gen_data(Object * obj,Error ** errp)98 static GByteArray *qcrypto_tls_cipher_suites_fw_cfg_gen_data(Object *obj,
99 Error **errp)
100 {
101 return qcrypto_tls_cipher_suites_get_data(QCRYPTO_TLS_CIPHER_SUITES(obj),
102 errp);
103 }
104
qcrypto_tls_cipher_suites_class_init(ObjectClass * oc,void * data)105 static void qcrypto_tls_cipher_suites_class_init(ObjectClass *oc, void *data)
106 {
107 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
108 FWCfgDataGeneratorClass *fwgc = FW_CFG_DATA_GENERATOR_CLASS(oc);
109
110 ucc->complete = qcrypto_tls_cipher_suites_complete;
111 fwgc->get_data = qcrypto_tls_cipher_suites_fw_cfg_gen_data;
112 }
113
114 static const TypeInfo qcrypto_tls_cipher_suites_info = {
115 .parent = TYPE_QCRYPTO_TLS_CREDS,
116 .name = TYPE_QCRYPTO_TLS_CIPHER_SUITES,
117 .instance_size = sizeof(QCryptoTLSCipherSuites),
118 .class_size = sizeof(QCryptoTLSCredsClass),
119 .class_init = qcrypto_tls_cipher_suites_class_init,
120 .interfaces = (InterfaceInfo[]) {
121 { TYPE_USER_CREATABLE },
122 { TYPE_FW_CFG_DATA_GENERATOR_INTERFACE },
123 { }
124 }
125 };
126
qcrypto_tls_cipher_suites_register_types(void)127 static void qcrypto_tls_cipher_suites_register_types(void)
128 {
129 type_register_static(&qcrypto_tls_cipher_suites_info);
130 }
131
132 type_init(qcrypto_tls_cipher_suites_register_types);
133