1/*
2 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "e_os.h"
11#include "internal/cryptlib.h"
12#include <stdio.h>
13#include <openssl/asn1t.h>
14#include <openssl/conf.h>
15#include <openssl/x509v3.h>
16#include "ext_dat.h"
17
18static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
19 TLS_FEATURE *tls_feature,
20 STACK_OF(CONF_VALUE) *ext_list);
21static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
22 X509V3_CTX *ctx,
23 STACK_OF(CONF_VALUE) *nval);
24
25ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
26 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
27static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
28
29IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
30
31const X509V3_EXT_METHOD v3_tls_feature = {
32 NID_tlsfeature, 0,
33 ASN1_ITEM_ref(TLS_FEATURE),
34 0, 0, 0, 0,
35 0, 0,
36 (X509V3_EXT_I2V)i2v_TLS_FEATURE,
37 (X509V3_EXT_V2I)v2i_TLS_FEATURE,
38 0, 0,
39 NULL
40};
41
42
43typedef struct {
44 long num;
45 const char *name;
46} TLS_FEATURE_NAME;
47
48static TLS_FEATURE_NAME tls_feature_tbl[] = {
49 { 5, "status_request" },
50 { 17, "status_request_v2" }
51};
52
53/*
54 * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
55 * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
56 * used by the CONF library to represent a multi-valued extension. ext_list is
57 * returned.
58 */
59static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
60 TLS_FEATURE *tls_feature,
61 STACK_OF(CONF_VALUE) *ext_list)
62{
63 int i;
64 size_t j;
65 ASN1_INTEGER *ai;
66 long tlsextid;
67 for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
68 ai = sk_ASN1_INTEGER_value(tls_feature, i);
69 tlsextid = ASN1_INTEGER_get(ai);
70 for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
71 if (tlsextid == tls_feature_tbl[j].num)
72 break;
73 if (j < OSSL_NELEM(tls_feature_tbl))
74 X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
75 else
76 X509V3_add_value_int(NULL, ai, &ext_list);
77 }
78 return ext_list;
79}
80
81/*
82 * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
83 * structure, which is returned if the conversion is successful. In case of
84 * error, NULL is returned.
85 */
86static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
87 X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
88{
89 TLS_FEATURE *tlsf;
90 char *extval, *endptr;
91 ASN1_INTEGER *ai;
92 CONF_VALUE *val;
93 int i;
94 size_t j;
95 long tlsextid;
96
97 if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
98 X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
99 return NULL;
100 }
101
102 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
103 val = sk_CONF_VALUE_value(nval, i);
104 if (val->value)
105 extval = val->value;
106 else
107 extval = val->name;
108
109 for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
110 if (strcasecmp(extval, tls_feature_tbl[j].name) == 0)
111 break;
112 if (j < OSSL_NELEM(tls_feature_tbl))
113 tlsextid = tls_feature_tbl[j].num;
114 else {
115 tlsextid = strtol(extval, &endptr, 10);
116 if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
117 (tlsextid > 65535)) {
118 X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
119 X509V3_conf_err(val);
120 goto err;
121 }
122 }
123
124 if ((ai = ASN1_INTEGER_new()) == NULL
125 || !ASN1_INTEGER_set(ai, tlsextid)
126 || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {
127 X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
128 goto err;
129 }
130 }
131 return tlsf;
132
133 err:
134 sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
135 return NULL;
136}
137