1 /*
2 * Testing tool for ASN.1 routines
3 * Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
9 #include "includes.h"
11 #include "common.h"
12 #include "tls/asn1.h"
14 extern int wpa_debug_level;
17 static const char * asn1_class_str(int class)
18 {
19 switch (class) {
20 case ASN1_CLASS_UNIVERSAL:
21 return "Universal";
22 case ASN1_CLASS_APPLICATION:
23 return "Application";
24 case ASN1_CLASS_CONTEXT_SPECIFIC:
25 return "Context-specific";
26 case ASN1_CLASS_PRIVATE:
27 return "Private";
28 default:
29 return "?";
30 }
31 }
34 int asn1_parse(const u8 *buf, size_t len, int level)
35 {
36 const u8 *pos, *prev, *end;
37 char prefix[10], str[100];
38 int _level;
39 struct asn1_hdr hdr;
40 struct asn1_oid oid;
41 u8 tmp;
43 _level = level;
44 if ((size_t) _level > sizeof(prefix) - 1)
45 _level = sizeof(prefix) - 1;
46 memset(prefix, ' ', _level);
47 prefix[_level] = '\0';
49 pos = buf;
50 end = buf + len;
52 while (pos < end) {
53 if (asn1_get_next(pos, end - pos, &hdr) < 0)
54 return -1;
56 prev = pos;
57 pos = hdr.payload;
59 wpa_printf(MSG_MSGDUMP, "ASN.1:%s Class %d(%s) P/C %d(%s) "
60 "Tag %u Length %u",
61 prefix, hdr.class, asn1_class_str(hdr.class),
62 hdr.constructed,
63 hdr.constructed ? "Constructed" : "Primitive",
64 hdr.tag, hdr.length);
66 if (hdr.class == ASN1_CLASS_CONTEXT_SPECIFIC &&
67 hdr.constructed) {
68 if (asn1_parse(pos, hdr.length, level + 1) < 0)
69 return -1;
70 pos += hdr.length;
71 }
73 if (hdr.class != ASN1_CLASS_UNIVERSAL)
74 continue;
76 switch (hdr.tag) {
77 case ASN1_TAG_EOC:
78 if (hdr.length) {
79 wpa_printf(MSG_DEBUG, "ASN.1: Non-zero "
80 "end-of-contents length (%u)",
81 hdr.length);
82 return -1;
83 }
84 wpa_printf(MSG_MSGDUMP, "ASN.1:%s EOC", prefix);
85 break;
86 case ASN1_TAG_BOOLEAN:
87 if (hdr.length != 1) {
88 wpa_printf(MSG_DEBUG, "ASN.1: Unexpected "
89 "Boolean length (%u)", hdr.length);
90 return -1;
91 }
92 tmp = *pos++;
93 wpa_printf(MSG_MSGDUMP, "ASN.1:%s Boolean %s",
94 prefix, tmp ? "TRUE" : "FALSE");
95 break;
96 case ASN1_TAG_INTEGER:
97 wpa_hexdump(MSG_MSGDUMP, "ASN.1: INTEGER",
98 pos, hdr.length);
99 pos += hdr.length;
100 break;
101 case ASN1_TAG_BITSTRING:
102 wpa_hexdump(MSG_MSGDUMP, "ASN.1: BitString",
103 pos, hdr.length);
104 pos += hdr.length;
105 break;
106 case ASN1_TAG_OCTETSTRING:
107 wpa_hexdump(MSG_MSGDUMP, "ASN.1: OctetString",
108 pos, hdr.length);
109 pos += hdr.length;
110 break;
111 case ASN1_TAG_NULL:
112 if (hdr.length) {
113 wpa_printf(MSG_DEBUG, "ASN.1: Non-zero Null "
114 "length (%u)", hdr.length);
115 return -1;
116 }
117 wpa_printf(MSG_MSGDUMP, "ASN.1:%s Null", prefix);
118 break;
119 case ASN1_TAG_OID:
120 if (asn1_get_oid(prev, end - prev, &oid, &prev) < 0) {
121 wpa_printf(MSG_DEBUG, "ASN.1: Invalid OID");
122 return -1;
123 }
124 asn1_oid_to_str(&oid, str, sizeof(str));
125 wpa_printf(MSG_DEBUG, "ASN.1:%s OID %s", prefix, str);
126 pos += hdr.length;
127 break;
128 case ANS1_TAG_RELATIVE_OID:
129 wpa_hexdump(MSG_MSGDUMP, "ASN.1: Relative OID",
130 pos, hdr.length);
131 pos += hdr.length;
132 break;
133 case ASN1_TAG_SEQUENCE:
134 wpa_printf(MSG_MSGDUMP, "ASN.1:%s SEQUENCE", prefix);
135 if (asn1_parse(pos, hdr.length, level + 1) < 0)
136 return -1;
137 pos += hdr.length;
138 break;
139 case ASN1_TAG_SET:
140 wpa_printf(MSG_MSGDUMP, "ASN.1:%s SET", prefix);
141 if (asn1_parse(pos, hdr.length, level + 1) < 0)
142 return -1;
143 pos += hdr.length;
144 break;
145 case ASN1_TAG_PRINTABLESTRING:
146 wpa_hexdump_ascii(MSG_MSGDUMP,
147 "ASN.1: PrintableString",
148 pos, hdr.length);
149 pos += hdr.length;
150 break;
151 case ASN1_TAG_IA5STRING:
152 wpa_hexdump_ascii(MSG_MSGDUMP, "ASN.1: IA5String",
153 pos, hdr.length);
154 pos += hdr.length;
155 break;
156 case ASN1_TAG_UTCTIME:
157 wpa_hexdump_ascii(MSG_MSGDUMP, "ASN.1: UTCTIME",
158 pos, hdr.length);
159 pos += hdr.length;
160 break;
161 case ASN1_TAG_VISIBLESTRING:
162 wpa_hexdump_ascii(MSG_MSGDUMP, "ASN.1: VisibleString",
163 pos, hdr.length);
164 pos += hdr.length;
165 break;
166 default:
167 wpa_printf(MSG_DEBUG, "ASN.1: Unknown tag %d",
168 hdr.tag);
169 return -1;
170 }
171 }
173 return 0;
174 }
177 int main(int argc, char *argv[])
178 {
179 FILE *f;
180 u8 buf[3000];
181 size_t len;
183 wpa_debug_level = 0;
185 f = fopen(argv[1], "rb");
186 if (f == NULL)
187 return -1;
188 len = fread(buf, 1, sizeof(buf), f);
189 fclose(f);
191 if (asn1_parse(buf, len, 0) < 0)
192 printf("Failed to parse DER ASN.1\n");
194 printf("\n\n");
196 return 0;
197 }