1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* AlternativeName
* (C) 1999-2007 Jack Lloyd
* 2007 Yves Jerschow
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/asn1_alt_name.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/oids.h>
#include <botan/internal/stl_util.h>
#include <botan/charset.h>
#include <botan/parsing.h>
#include <botan/loadstor.h>
namespace Botan {
namespace {
/*
* Check if type is a known ASN.1 string type
*/
bool is_string_type(ASN1_Tag tag)
{
return (tag == NUMERIC_STRING ||
tag == PRINTABLE_STRING ||
tag == VISIBLE_STRING ||
tag == T61_STRING ||
tag == IA5_STRING ||
tag == UTF8_STRING ||
tag == BMP_STRING);
}
}
/*
* Create an AlternativeName
*/
AlternativeName::AlternativeName(const std::string& email_addr,
const std::string& uri,
const std::string& dns,
const std::string& ip)
{
add_attribute("RFC822", email_addr);
add_attribute("DNS", dns);
add_attribute("URI", uri);
add_attribute("IP", ip);
}
/*
* Add an attribute to an alternative name
*/
void AlternativeName::add_attribute(const std::string& type,
const std::string& str)
{
if(type == "" || str == "")
return;
auto range = alt_info.equal_range(type);
for(auto j = range.first; j != range.second; ++j)
if(j->second == str)
return;
multimap_insert(alt_info, type, str);
}
/*
* Add an OtherName field
*/
void AlternativeName::add_othername(const OID& oid, const std::string& value,
ASN1_Tag type)
{
if(value == "")
return;
multimap_insert(othernames, oid, ASN1_String(value, type));
}
/*
* Get the attributes of this alternative name
*/
std::multimap<std::string, std::string> AlternativeName::get_attributes() const
{
return alt_info;
}
/*
* Get the otherNames
*/
std::multimap<OID, ASN1_String> AlternativeName::get_othernames() const
{
return othernames;
}
/*
* Return all of the alternative names
*/
std::multimap<std::string, std::string> AlternativeName::contents() const
{
std::multimap<std::string, std::string> names;
for(auto i = alt_info.begin(); i != alt_info.end(); ++i)
multimap_insert(names, i->first, i->second);
for(auto i = othernames.begin(); i != othernames.end(); ++i)
multimap_insert(names, OIDS::lookup(i->first), i->second.value());
return names;
}
/*
* Return if this object has anything useful
*/
bool AlternativeName::has_items() const
{
return (alt_info.size() > 0 || othernames.size() > 0);
}
namespace {
/*
* DER encode an AlternativeName entry
*/
void encode_entries(DER_Encoder& encoder,
const std::multimap<std::string, std::string>& attr,
const std::string& type, ASN1_Tag tagging)
{
auto range = attr.equal_range(type);
for(auto i = range.first; i != range.second; ++i)
{
if(type == "RFC822" || type == "DNS" || type == "URI")
{
ASN1_String asn1_string(i->second, IA5_STRING);
encoder.add_object(tagging, CONTEXT_SPECIFIC, asn1_string.iso_8859());
}
else if(type == "IP")
{
const u32bit ip = string_to_ipv4(i->second);
byte ip_buf[4] = { 0 };
store_be(ip, ip_buf);
encoder.add_object(tagging, CONTEXT_SPECIFIC, ip_buf, 4);
}
}
}
}
/*
* DER encode an AlternativeName extension
*/
void AlternativeName::encode_into(DER_Encoder& der) const
{
der.start_cons(SEQUENCE);
encode_entries(der, alt_info, "RFC822", ASN1_Tag(1));
encode_entries(der, alt_info, "DNS", ASN1_Tag(2));
encode_entries(der, alt_info, "URI", ASN1_Tag(6));
encode_entries(der, alt_info, "IP", ASN1_Tag(7));
for(auto i = othernames.begin(); i != othernames.end(); ++i)
{
der.start_explicit(0)
.encode(i->first)
.start_explicit(0)
.encode(i->second)
.end_explicit()
.end_explicit();
}
der.end_cons();
}
/*
* Decode a BER encoded AlternativeName
*/
void AlternativeName::decode_from(BER_Decoder& source)
{
BER_Decoder names = source.start_cons(SEQUENCE);
while(names.more_items())
{
BER_Object obj = names.get_next_object();
if((obj.class_tag != CONTEXT_SPECIFIC) &&
(obj.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED)))
continue;
const ASN1_Tag tag = obj.type_tag;
if(tag == 0)
{
BER_Decoder othername(obj.value);
OID oid;
othername.decode(oid);
if(othername.more_items())
{
BER_Object othername_value_outer = othername.get_next_object();
othername.verify_end();
if(othername_value_outer.type_tag != ASN1_Tag(0) ||
othername_value_outer.class_tag !=
(CONTEXT_SPECIFIC | CONSTRUCTED)
)
throw Decoding_Error("Invalid tags on otherName value");
BER_Decoder othername_value_inner(othername_value_outer.value);
BER_Object value = othername_value_inner.get_next_object();
othername_value_inner.verify_end();
const ASN1_Tag value_type = value.type_tag;
if(is_string_type(value_type) && value.class_tag == UNIVERSAL)
add_othername(oid, ASN1::to_string(value), value_type);
}
}
else if(tag == 1 || tag == 2 || tag == 6)
{
const std::string value = Charset::transcode(ASN1::to_string(obj),
LATIN1_CHARSET,
LOCAL_CHARSET);
if(tag == 1) add_attribute("RFC822", value);
if(tag == 2) add_attribute("DNS", value);
if(tag == 6) add_attribute("URI", value);
}
else if(tag == 7)
{
if(obj.value.size() == 4)
{
const u32bit ip = load_be<u32bit>(&obj.value[0], 0);
add_attribute("IP", ipv4_to_string(ip));
}
}
}
}
}
|
