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/*
* 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.empty() || str.empty())
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.empty())
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));
}
}
}
}
}
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