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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/parsing.h>
#include <botan/loadstor.h>
#include <botan/x509_dn.h>
#include <sstream>
namespace Botan {
/*
* 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& value)
{
if(type.empty() || value.empty())
return;
auto range = m_alt_info.equal_range(type);
for(auto j = range.first; j != range.second; ++j)
if(j->second == value)
return;
multimap_insert(m_alt_info, type, value);
}
/*
* Add an OtherName field
*/
void AlternativeName::add_othername(const OID& oid, const std::string& value,
ASN1_Tag type)
{
if(value.empty())
return;
multimap_insert(m_othernames, oid, ASN1_String(value, type));
}
/*
* 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 = m_alt_info.begin(); i != m_alt_info.end(); ++i)
multimap_insert(names, i->first, i->second);
for(auto i = m_othernames.begin(); i != m_othernames.end(); ++i)
multimap_insert(names, OIDS::lookup(i->first), i->second.value());
return names;
}
bool AlternativeName::has_field(const std::string& attr) const
{
auto range = m_alt_info.equal_range(attr);
return (range.first != range.second);
}
std::string AlternativeName::get_first_attribute(const std::string& attr) const
{
auto i = m_alt_info.lower_bound(attr);
if(i != m_alt_info.end() && i->first == attr)
return i->second;
return "";
}
std::vector<std::string> AlternativeName::get_attribute(const std::string& attr) const
{
std::vector<std::string> results;
auto range = m_alt_info.equal_range(attr);
for(auto i = range.first; i != range.second; ++i)
results.push_back(i->second);
return results;
}
/*
* Return if this object has anything useful
*/
bool AlternativeName::has_items() const
{
return (m_alt_info.size() > 0 || m_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.value());
}
else if(type == "IP")
{
const uint32_t ip = string_to_ipv4(i->second);
uint8_t ip_buf[4] = { 0 };
store_be(ip, ip_buf);
encoder.add_object(tagging, CONTEXT_SPECIFIC, ip_buf, 4);
}
else if (type == "DN")
{
std::stringstream ss(i->second);
X509_DN dn;
ss >> dn;
encoder.encode(dn);
}
}
}
}
/*
* DER encode an AlternativeName extension
*/
void AlternativeName::encode_into(DER_Encoder& der) const
{
der.start_cons(SEQUENCE);
encode_entries(der, m_alt_info, "RFC822", ASN1_Tag(1));
encode_entries(der, m_alt_info, "DNS", ASN1_Tag(2));
encode_entries(der, m_alt_info, "DN", ASN1_Tag(4));
encode_entries(der, m_alt_info, "URI", ASN1_Tag(6));
encode_entries(der, m_alt_info, "IP", ASN1_Tag(7));
for(auto i = m_othernames.begin(); i != m_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);
// FIXME this is largely a duplication of GeneralName::decode_from
while(names.more_items())
{
BER_Object obj = names.get_next_object();
if(obj.is_a(0, CONTEXT_SPECIFIC))
{
BER_Decoder othername(obj);
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.is_a(0, ASN1_Tag(CONTEXT_SPECIFIC | CONSTRUCTED)) == false)
throw Decoding_Error("Invalid tags on otherName value");
BER_Decoder othername_value_inner(othername_value_outer);
BER_Object value = othername_value_inner.get_next_object();
othername_value_inner.verify_end();
if(ASN1_String::is_string_type(value.type()) && value.get_class() == UNIVERSAL)
{
add_othername(oid, ASN1::to_string(value), value.type());
}
}
}
if(obj.is_a(1, CONTEXT_SPECIFIC))
{
add_attribute("RFC822", ASN1::to_string(obj));
}
else if(obj.is_a(2, CONTEXT_SPECIFIC))
{
add_attribute("DNS", ASN1::to_string(obj));
}
else if(obj.is_a(6, CONTEXT_SPECIFIC))
{
add_attribute("URI", ASN1::to_string(obj));
}
else if(obj.is_a(4, ASN1_Tag(CONTEXT_SPECIFIC | CONSTRUCTED)))
{
BER_Decoder dec(obj);
X509_DN dn;
std::stringstream ss;
dec.decode(dn);
ss << dn;
add_attribute("DN", ss.str());
}
else if(obj.is_a(7, CONTEXT_SPECIFIC))
{
if(obj.length() == 4)
{
const uint32_t ip = load_be<uint32_t>(obj.bits(), 0);
add_attribute("IP", ipv4_to_string(ip));
}
}
}
}
}
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