1/*
2 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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 "internal/o_str.h"
14#include <openssl/asn1t.h>
15#include <openssl/conf.h>
16#include <openssl/x509v3.h>
17#include "ext_dat.h"
18
19static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
20                                             TLS_FEATURE *tls_feature,
21                                             STACK_OF(CONF_VALUE) *ext_list);
22static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
23                                    X509V3_CTX *ctx,
24                                    STACK_OF(CONF_VALUE) *nval);
25
26ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
27        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
28static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
29
30IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
31
32const X509V3_EXT_METHOD v3_tls_feature = {
33    NID_tlsfeature, 0,
34    ASN1_ITEM_ref(TLS_FEATURE),
35    0, 0, 0, 0,
36    0, 0,
37    (X509V3_EXT_I2V)i2v_TLS_FEATURE,
38    (X509V3_EXT_V2I)v2i_TLS_FEATURE,
39    0, 0,
40    NULL
41};
42
43
44typedef struct {
45    long num;
46    const char *name;
47} TLS_FEATURE_NAME;
48
49static TLS_FEATURE_NAME tls_feature_tbl[] = {
50    { 5, "status_request" },
51    { 17, "status_request_v2" }
52};
53
54/*
55 * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
56 * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
57 * used by the CONF library to represent a multi-valued extension.  ext_list is
58 * returned.
59 */
60static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
61                                             TLS_FEATURE *tls_feature,
62                                             STACK_OF(CONF_VALUE) *ext_list)
63{
64    int i;
65    size_t j;
66    ASN1_INTEGER *ai;
67    long tlsextid;
68    for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
69        ai = sk_ASN1_INTEGER_value(tls_feature, i);
70        tlsextid = ASN1_INTEGER_get(ai);
71        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
72            if (tlsextid == tls_feature_tbl[j].num)
73                break;
74        if (j < OSSL_NELEM(tls_feature_tbl))
75            X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
76        else
77            X509V3_add_value_int(NULL, ai, &ext_list);
78    }
79    return ext_list;
80}
81
82/*
83 * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
84 * structure, which is returned if the conversion is successful.  In case of
85 * error, NULL is returned.
86 */
87static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
88                                    X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
89{
90    TLS_FEATURE *tlsf;
91    char *extval, *endptr;
92    ASN1_INTEGER *ai;
93    CONF_VALUE *val;
94    int i;
95    size_t j;
96    long tlsextid;
97
98    if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
99        X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
100        return NULL;
101    }
102
103    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
104        val = sk_CONF_VALUE_value(nval, i);
105        if (val->value)
106            extval = val->value;
107        else
108            extval = val->name;
109
110        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
111            if (strcasecmp(extval, tls_feature_tbl[j].name) == 0)
112                break;
113        if (j < OSSL_NELEM(tls_feature_tbl))
114            tlsextid = tls_feature_tbl[j].num;
115        else {
116            tlsextid = strtol(extval, &endptr, 10);
117            if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
118                (tlsextid > 65535)) {
119                X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
120                X509V3_conf_err(val);
121                goto err;
122            }
123        }
124
125        if ((ai = ASN1_INTEGER_new()) == NULL
126                || !ASN1_INTEGER_set(ai, tlsextid)
127                || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {
128            X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
129            goto err;
130        }
131    }
132    return tlsf;
133
134 err:
135    sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
136    return NULL;
137}
138