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/*
* Certificate Request Message
* (C) 2004-2006,2012 Jack Lloyd
* 2021 Elektrobit Automotive GmbH
* 2022 René Meusel, Hannes Rantzsch - neXenio GmbH
*
* 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::TLS {
Handshake_Type Certificate_Req::type() const
{
return CERTIFICATE_REQUEST;
}
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) :
m_names(ca_certs),
m_cert_key_types({ "RSA", "ECDSA", "DSA" })
{
m_schemes = policy.acceptable_signature_schemes();
hash.update(io.send(*this));
}
/**
* Deserialize a Certificate Request message
*/
Certificate_Req::Certificate_Req(const std::vector<uint8_t>& buf)
{
if(buf.size() < 4)
throw Decoding_Error("Certificate_Req: Bad certificate request");
TLS_Data_Reader reader("CertificateRequest", buf);
const auto cert_type_codes = reader.get_range_vector<uint8_t>(1, 1, 255);
for(const auto cert_type_code : cert_type_codes)
{
const std::string cert_type_name = cert_type_code_to_name(cert_type_code);
if(cert_type_name.empty()) // something we don't know
continue;
m_cert_key_types.emplace_back(cert_type_name);
}
const std::vector<uint8_t> algs = reader.get_range_vector<uint8_t>(2, 2, 65534);
if(algs.size() % 2 != 0)
throw Decoding_Error("Bad length for signature IDs in certificate request");
for(size_t i = 0; i != algs.size(); i += 2)
{
m_schemes.push_back(static_cast<Signature_Scheme>(make_uint16(algs[i], algs[i+1])));
}
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.emplace_back(name);
}
}
const std::vector<std::string>& Certificate_Req::acceptable_cert_types() const
{
return m_cert_key_types;
}
const std::vector<X509_DN>& Certificate_Req::acceptable_CAs() const
{
return m_names;
}
const std::vector<Signature_Scheme>& Certificate_Req::signature_schemes() const
{
return m_schemes;
}
/**
* 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(const auto& cert_key_type : m_cert_key_types)
cert_types.push_back(cert_type_name_to_code(cert_key_type));
append_tls_length_value(buf, cert_types, 1);
if(!m_schemes.empty())
buf += Signature_Algorithms(m_schemes).serialize(Connection_Side::SERVER);
std::vector<uint8_t> encoded_names;
for(const auto& name : m_names)
{
DER_Encoder encoder;
encoder.encode(name);
append_tls_length_value(encoded_names, encoder.get_contents(), 2);
}
append_tls_length_value(buf, encoded_names, 2);
return buf;
}
}
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