1/*
2 * Copyright 1999-2020 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/* X509 v3 extension utilities */
11
12#include <stdio.h>
13#include "internal/cryptlib.h"
14#include <openssl/conf.h>
15#include <openssl/x509v3.h>
16
17/* Extension printing routines */
18
19static int unknown_ext_print(BIO *out, const unsigned char *ext, int extlen,
20                             unsigned long flag, int indent, int supported);
21
22/* Print out a name+value stack */
23
24void X509V3_EXT_val_prn(BIO *out, STACK_OF(CONF_VALUE) *val, int indent,
25                        int ml)
26{
27    int i;
28    CONF_VALUE *nval;
29    if (!val)
30        return;
31    if (!ml || !sk_CONF_VALUE_num(val)) {
32        BIO_printf(out, "%*s", indent, "");
33        if (!sk_CONF_VALUE_num(val))
34            BIO_puts(out, "<EMPTY>\n");
35    }
36    for (i = 0; i < sk_CONF_VALUE_num(val); i++) {
37        if (ml) {
38            if (i > 0)
39                BIO_printf(out, "\n");
40            BIO_printf(out, "%*s", indent, "");
41        }
42        else if (i > 0)
43            BIO_printf(out, ", ");
44        nval = sk_CONF_VALUE_value(val, i);
45        if (!nval->name)
46            BIO_puts(out, nval->value);
47        else if (!nval->value)
48            BIO_puts(out, nval->name);
49#ifndef CHARSET_EBCDIC
50        else
51            BIO_printf(out, "%s:%s", nval->name, nval->value);
52#else
53        else {
54            int len;
55            char *tmp;
56            len = strlen(nval->value) + 1;
57            tmp = OPENSSL_malloc(len);
58            if (tmp != NULL) {
59                ascii2ebcdic(tmp, nval->value, len);
60                BIO_printf(out, "%s:%s", nval->name, tmp);
61                OPENSSL_free(tmp);
62            }
63        }
64#endif
65    }
66}
67
68/* Main routine: print out a general extension */
69
70int X509V3_EXT_print(BIO *out, X509_EXTENSION *ext, unsigned long flag,
71                     int indent)
72{
73    void *ext_str = NULL;
74    char *value = NULL;
75    ASN1_OCTET_STRING *extoct;
76    const unsigned char *p;
77    int extlen;
78    const X509V3_EXT_METHOD *method;
79    STACK_OF(CONF_VALUE) *nval = NULL;
80    int ok = 1;
81
82    extoct = X509_EXTENSION_get_data(ext);
83    p = ASN1_STRING_get0_data(extoct);
84    extlen = ASN1_STRING_length(extoct);
85
86    if ((method = X509V3_EXT_get(ext)) == NULL)
87        return unknown_ext_print(out, p, extlen, flag, indent, 0);
88    if (method->it)
89        ext_str = ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
90    else
91        ext_str = method->d2i(NULL, &p, extlen);
92
93    if (!ext_str)
94        return unknown_ext_print(out, p, extlen, flag, indent, 1);
95
96    if (method->i2s) {
97        if ((value = method->i2s(method, ext_str)) == NULL) {
98            ok = 0;
99            goto err;
100        }
101#ifndef CHARSET_EBCDIC
102        BIO_printf(out, "%*s%s", indent, "", value);
103#else
104        {
105            int len;
106            char *tmp;
107            len = strlen(value) + 1;
108            tmp = OPENSSL_malloc(len);
109            if (tmp != NULL) {
110                ascii2ebcdic(tmp, value, len);
111                BIO_printf(out, "%*s%s", indent, "", tmp);
112                OPENSSL_free(tmp);
113            }
114        }
115#endif
116    } else if (method->i2v) {
117        if ((nval = method->i2v(method, ext_str, NULL)) == NULL) {
118            ok = 0;
119            goto err;
120        }
121        X509V3_EXT_val_prn(out, nval, indent,
122                           method->ext_flags & X509V3_EXT_MULTILINE);
123    } else if (method->i2r) {
124        if (!method->i2r(method, ext_str, out, indent))
125            ok = 0;
126    } else
127        ok = 0;
128
129 err:
130    sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
131    OPENSSL_free(value);
132    if (method->it)
133        ASN1_item_free(ext_str, ASN1_ITEM_ptr(method->it));
134    else
135        method->ext_free(ext_str);
136    return ok;
137}
138
139int X509V3_extensions_print(BIO *bp, const char *title,
140                            const STACK_OF(X509_EXTENSION) *exts,
141                            unsigned long flag, int indent)
142{
143    int i, j;
144
145    if (sk_X509_EXTENSION_num(exts) <= 0)
146        return 1;
147
148    if (title) {
149        BIO_printf(bp, "%*s%s:\n", indent, "", title);
150        indent += 4;
151    }
152
153    for (i = 0; i < sk_X509_EXTENSION_num(exts); i++) {
154        ASN1_OBJECT *obj;
155        X509_EXTENSION *ex;
156
157        ex = sk_X509_EXTENSION_value(exts, i);
158        obj = X509_EXTENSION_get_object(ex);
159        if ((flag & X509_FLAG_EXTENSIONS_ONLY_KID) != 0
160                && OBJ_obj2nid(obj) != NID_subject_key_identifier
161                && OBJ_obj2nid(obj) != NID_authority_key_identifier)
162            continue;
163        if (indent && BIO_printf(bp, "%*s", indent, "") <= 0)
164            return 0;
165        i2a_ASN1_OBJECT(bp, obj);
166        j = X509_EXTENSION_get_critical(ex);
167        if (BIO_printf(bp, ": %s\n", j ? "critical" : "") <= 0)
168            return 0;
169        if (!X509V3_EXT_print(bp, ex, flag, indent + 4)) {
170            BIO_printf(bp, "%*s", indent + 4, "");
171            ASN1_STRING_print(bp, X509_EXTENSION_get_data(ex));
172        }
173        if (BIO_write(bp, "\n", 1) <= 0)
174            return 0;
175    }
176    return 1;
177}
178
179static int unknown_ext_print(BIO *out, const unsigned char *ext, int extlen,
180                             unsigned long flag, int indent, int supported)
181{
182    switch (flag & X509V3_EXT_UNKNOWN_MASK) {
183
184    case X509V3_EXT_DEFAULT:
185        return 0;
186
187    case X509V3_EXT_ERROR_UNKNOWN:
188        if (supported)
189            BIO_printf(out, "%*s<Parse Error>", indent, "");
190        else
191            BIO_printf(out, "%*s<Not Supported>", indent, "");
192        return 1;
193
194    case X509V3_EXT_PARSE_UNKNOWN:
195        return ASN1_parse_dump(out, ext, extlen, indent, -1);
196    case X509V3_EXT_DUMP_UNKNOWN:
197        return BIO_dump_indent(out, (const char *)ext, extlen, indent);
198
199    default:
200        return 1;
201    }
202}
203
204#ifndef OPENSSL_NO_STDIO
205int X509V3_EXT_print_fp(FILE *fp, X509_EXTENSION *ext, int flag, int indent)
206{
207    BIO *bio_tmp;
208    int ret;
209
210    if ((bio_tmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL)
211        return 0;
212    ret = X509V3_EXT_print(bio_tmp, ext, flag, indent);
213    BIO_free(bio_tmp);
214    return ret;
215}
216#endif
217