1/*
2 * Copyright 1999-2016 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/* 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            BIO_printf(out, "%*s", indent, "");
39        else if (i > 0)
40            BIO_printf(out, ", ");
41        nval = sk_CONF_VALUE_value(val, i);
42        if (!nval->name)
43            BIO_puts(out, nval->value);
44        else if (!nval->value)
45            BIO_puts(out, nval->name);
46#ifndef CHARSET_EBCDIC
47        else
48            BIO_printf(out, "%s:%s", nval->name, nval->value);
49#else
50        else {
51            int len;
52            char *tmp;
53            len = strlen(nval->value) + 1;
54            tmp = OPENSSL_malloc(len);
55            if (tmp != NULL) {
56                ascii2ebcdic(tmp, nval->value, len);
57                BIO_printf(out, "%s:%s", nval->name, tmp);
58                OPENSSL_free(tmp);
59            }
60        }
61#endif
62        if (ml)
63            BIO_puts(out, "\n");
64    }
65}
66
67/* Main routine: print out a general extension */
68
69int X509V3_EXT_print(BIO *out, X509_EXTENSION *ext, unsigned long flag,
70                     int indent)
71{
72    void *ext_str = NULL;
73    char *value = NULL;
74    ASN1_OCTET_STRING *extoct;
75    const unsigned char *p;
76    int extlen;
77    const X509V3_EXT_METHOD *method;
78    STACK_OF(CONF_VALUE) *nval = NULL;
79    int ok = 1;
80
81    extoct = X509_EXTENSION_get_data(ext);
82    p = ASN1_STRING_get0_data(extoct);
83    extlen = ASN1_STRING_length(extoct);
84
85    if ((method = X509V3_EXT_get(ext)) == NULL)
86        return unknown_ext_print(out, p, extlen, flag, indent, 0);
87    if (method->it)
88        ext_str = ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
89    else
90        ext_str = method->d2i(NULL, &p, extlen);
91
92    if (!ext_str)
93        return unknown_ext_print(out, p, extlen, flag, indent, 1);
94
95    if (method->i2s) {
96        if ((value = method->i2s(method, ext_str)) == NULL) {
97            ok = 0;
98            goto err;
99        }
100#ifndef CHARSET_EBCDIC
101        BIO_printf(out, "%*s%s", indent, "", value);
102#else
103        {
104            int len;
105            char *tmp;
106            len = strlen(value) + 1;
107            tmp = OPENSSL_malloc(len);
108            if (tmp != NULL) {
109                ascii2ebcdic(tmp, value, len);
110                BIO_printf(out, "%*s%s", indent, "", tmp);
111                OPENSSL_free(tmp);
112            }
113        }
114#endif
115    } else if (method->i2v) {
116        if ((nval = method->i2v(method, ext_str, NULL)) == NULL) {
117            ok = 0;
118            goto err;
119        }
120        X509V3_EXT_val_prn(out, nval, indent,
121                           method->ext_flags & X509V3_EXT_MULTILINE);
122    } else if (method->i2r) {
123        if (!method->i2r(method, ext_str, out, indent))
124            ok = 0;
125    } else
126        ok = 0;
127
128 err:
129    sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
130    OPENSSL_free(value);
131    if (method->it)
132        ASN1_item_free(ext_str, ASN1_ITEM_ptr(method->it));
133    else
134        method->ext_free(ext_str);
135    return ok;
136}
137
138int X509V3_extensions_print(BIO *bp, const char *title,
139                            const STACK_OF(X509_EXTENSION) *exts,
140                            unsigned long flag, int indent)
141{
142    int i, j;
143
144    if (sk_X509_EXTENSION_num(exts) <= 0)
145        return 1;
146
147    if (title) {
148        BIO_printf(bp, "%*s%s:\n", indent, "", title);
149        indent += 4;
150    }
151
152    for (i = 0; i < sk_X509_EXTENSION_num(exts); i++) {
153        ASN1_OBJECT *obj;
154        X509_EXTENSION *ex;
155        ex = sk_X509_EXTENSION_value(exts, i);
156        if (indent && BIO_printf(bp, "%*s", indent, "") <= 0)
157            return 0;
158        obj = X509_EXTENSION_get_object(ex);
159        i2a_ASN1_OBJECT(bp, obj);
160        j = X509_EXTENSION_get_critical(ex);
161        if (BIO_printf(bp, ": %s\n", j ? "critical" : "") <= 0)
162            return 0;
163        if (!X509V3_EXT_print(bp, ex, flag, indent + 4)) {
164            BIO_printf(bp, "%*s", indent + 4, "");
165            ASN1_STRING_print(bp, X509_EXTENSION_get_data(ex));
166        }
167        if (BIO_write(bp, "\n", 1) <= 0)
168            return 0;
169    }
170    return 1;
171}
172
173static int unknown_ext_print(BIO *out, const unsigned char *ext, int extlen,
174                             unsigned long flag, int indent, int supported)
175{
176    switch (flag & X509V3_EXT_UNKNOWN_MASK) {
177
178    case X509V3_EXT_DEFAULT:
179        return 0;
180
181    case X509V3_EXT_ERROR_UNKNOWN:
182        if (supported)
183            BIO_printf(out, "%*s<Parse Error>", indent, "");
184        else
185            BIO_printf(out, "%*s<Not Supported>", indent, "");
186        return 1;
187
188    case X509V3_EXT_PARSE_UNKNOWN:
189        return ASN1_parse_dump(out, ext, extlen, indent, -1);
190    case X509V3_EXT_DUMP_UNKNOWN:
191        return BIO_dump_indent(out, (const char *)ext, extlen, indent);
192
193    default:
194        return 1;
195    }
196}
197
198#ifndef OPENSSL_NO_STDIO
199int X509V3_EXT_print_fp(FILE *fp, X509_EXTENSION *ext, int flag, int indent)
200{
201    BIO *bio_tmp;
202    int ret;
203
204    if ((bio_tmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL)
205        return 0;
206    ret = X509V3_EXT_print(bio_tmp, ext, flag, indent);
207    BIO_free(bio_tmp);
208    return ret;
209}
210#endif
211