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/*
* Certificate Request Message
* (C) 2004-2006,2012 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tls_messages.h>
#include <botan/tls_extensions.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/tls_handshake_hash.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
namespace Botan {
namespace TLS {
namespace {
std::string cert_type_code_to_name(uint8_t code)
{
switch(code)
{
case 1:
return "RSA";
case 2:
return "DSA";
case 64:
return "ECDSA";
default:
return ""; // DH or something else
}
}
uint8_t cert_type_name_to_code(const std::string& name)
{
if(name == "RSA")
return 1;
if(name == "DSA")
return 2;
if(name == "ECDSA")
return 64;
throw Invalid_Argument("Unknown cert type " + name);
}
}
/**
* Create a new Certificate Request message
*/
Certificate_Req::Certificate_Req(Handshake_IO& io,
Handshake_Hash& hash,
const Policy& policy,
const std::vector<X509_DN>& ca_certs,
Protocol_Version version) :
m_names(ca_certs),
m_cert_key_types({ "RSA", "DSA", "ECDSA" })
{
if(version.supports_negotiable_signature_algorithms())
{
std::vector<std::string> hashes = policy.allowed_signature_hashes();
std::vector<std::string> sigs = policy.allowed_signature_methods();
for(size_t i = 0; i != hashes.size(); ++i)
for(size_t j = 0; j != sigs.size(); ++j)
m_supported_algos.push_back(std::make_pair(hashes[i], sigs[j]));
}
hash.update(io.send(*this));
}
/**
* Deserialize a Certificate Request message
*/
Certificate_Req::Certificate_Req(const std::vector<uint8_t>& buf,
Protocol_Version version)
{
if(buf.size() < 4)
throw Decoding_Error("Certificate_Req: Bad certificate request");
TLS_Data_Reader reader("CertificateRequest", buf);
std::vector<uint8_t> cert_type_codes = reader.get_range_vector<uint8_t>(1, 1, 255);
for(size_t i = 0; i != cert_type_codes.size(); ++i)
{
const std::string cert_type_name = cert_type_code_to_name(cert_type_codes[i]);
if(cert_type_name.empty()) // something we don't know
continue;
m_cert_key_types.push_back(cert_type_name);
}
if(version.supports_negotiable_signature_algorithms())
{
std::vector<uint8_t> sig_hash_algs = reader.get_range_vector<uint8_t>(2, 2, 65534);
if(sig_hash_algs.size() % 2 != 0)
throw Decoding_Error("Bad length for signature IDs in certificate request");
for(size_t i = 0; i != sig_hash_algs.size(); i += 2)
{
std::string hash = Signature_Algorithms::hash_algo_name(sig_hash_algs[i]);
std::string sig = Signature_Algorithms::sig_algo_name(sig_hash_algs[i+1]);
m_supported_algos.push_back(std::make_pair(hash, sig));
}
}
const uint16_t purported_size = reader.get_uint16_t();
if(reader.remaining_bytes() != purported_size)
throw Decoding_Error("Inconsistent length in certificate request");
while(reader.has_remaining())
{
std::vector<uint8_t> name_bits = reader.get_range_vector<uint8_t>(2, 0, 65535);
BER_Decoder decoder(name_bits.data(), name_bits.size());
X509_DN name;
decoder.decode(name);
m_names.push_back(name);
}
}
/**
* Serialize a Certificate Request message
*/
std::vector<uint8_t> Certificate_Req::serialize() const
{
std::vector<uint8_t> buf;
std::vector<uint8_t> cert_types;
for(size_t i = 0; i != m_cert_key_types.size(); ++i)
cert_types.push_back(cert_type_name_to_code(m_cert_key_types[i]));
append_tls_length_value(buf, cert_types, 1);
if(!m_supported_algos.empty())
buf += Signature_Algorithms(m_supported_algos).serialize();
std::vector<uint8_t> encoded_names;
for(size_t i = 0; i != m_names.size(); ++i)
{
DER_Encoder encoder;
encoder.encode(m_names[i]);
append_tls_length_value(encoded_names, encoder.get_contents(), 2);
}
append_tls_length_value(buf, encoded_names, 2);
return buf;
}
}
}
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