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