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/*
* Certificate Request Message
* (C) 2004-2006,2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/internal/tls_messages.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_extensions.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/loadstor.h>
#include <botan/secqueue.h>
#include <stdio.h>
namespace Botan {
/**
* Create a new Certificate Request message
*/
Certificate_Req::Certificate_Req(Record_Writer& writer,
TLS_Handshake_Hash& hash,
const TLS_Policy& policy,
const std::vector<X509_Certificate>& ca_certs,
Version_Code version)
{
for(size_t i = 0; i != ca_certs.size(); ++i)
names.push_back(ca_certs[i].subject_dn());
cert_types.push_back(RSA_CERT);
cert_types.push_back(DSS_CERT);
if(version >= TLS_V12)
{
std::vector<std::string> hashes = policy.allowed_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]));
}
send(writer, hash);
}
/**
* Deserialize a Certificate Request message
*/
Certificate_Req::Certificate_Req(const MemoryRegion<byte>& buf,
Version_Code version)
{
if(buf.size() < 4)
throw Decoding_Error("Certificate_Req: Bad certificate request");
TLS_Data_Reader reader(buf);
cert_types = reader.get_range_vector<byte>(1, 1, 255);
if(version >= TLS_V12)
{
std::vector<byte> sig_hash_algs = reader.get_range_vector<byte>(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));
}
}
else
{
// The hardcoded settings from previous protocol versions
m_supported_algos.push_back(std::make_pair("TLS.Digest.0", "RSA"));
m_supported_algos.push_back(std::make_pair("SHA-1", "DSA"));
m_supported_algos.push_back(std::make_pair("SHA-1", "ECDSA"));
}
u16bit purported_size = reader.get_u16bit();
if(reader.remaining_bytes() != purported_size)
throw Decoding_Error("Inconsistent length in certificate request");
while(reader.has_remaining())
{
std::vector<byte> name_bits = reader.get_range_vector<byte>(2, 0, 65535);
BER_Decoder decoder(&name_bits[0], name_bits.size());
X509_DN name;
decoder.decode(name);
names.push_back(name);
}
}
/**
* Serialize a Certificate Request message
*/
MemoryVector<byte> Certificate_Req::serialize() const
{
MemoryVector<byte> buf;
append_tls_length_value(buf, cert_types, 1);
if(!m_supported_algos.empty())
{
buf += Signature_Algorithms(m_supported_algos).serialize();
}
for(size_t i = 0; i != names.size(); ++i)
{
DER_Encoder encoder;
encoder.encode(names[i]);
append_tls_length_value(buf, encoder.get_contents(), 2);
}
return buf;
}
/**
* Create a new Certificate message
*/
Certificate::Certificate(Record_Writer& writer,
TLS_Handshake_Hash& hash,
const std::vector<X509_Certificate>& cert_list)
{
certs = cert_list;
send(writer, hash);
}
/**
* Deserialize a Certificate message
*/
Certificate::Certificate(const MemoryRegion<byte>& buf)
{
if(buf.size() < 3)
throw Decoding_Error("Certificate: Message malformed");
const size_t total_size = make_u32bit(0, buf[0], buf[1], buf[2]);
SecureQueue queue;
queue.write(&buf[3], buf.size() - 3);
if(queue.size() != total_size)
throw Decoding_Error("Certificate: Message malformed");
while(queue.size())
{
if(queue.size() < 3)
throw Decoding_Error("Certificate: Message malformed");
byte len[3];
queue.read(len, 3);
const size_t cert_size = make_u32bit(0, len[0], len[1], len[2]);
const size_t original_size = queue.size();
X509_Certificate cert(queue);
if(queue.size() + cert_size != original_size)
throw Decoding_Error("Certificate: Message malformed");
certs.push_back(cert);
}
}
/**
* Serialize a Certificate message
*/
MemoryVector<byte> Certificate::serialize() const
{
MemoryVector<byte> buf(3);
for(size_t i = 0; i != certs.size(); ++i)
{
MemoryVector<byte> raw_cert = certs[i].BER_encode();
const size_t cert_size = raw_cert.size();
for(size_t i = 0; i != 3; ++i)
buf.push_back(get_byte<u32bit>(i+1, cert_size));
buf += raw_cert;
}
const size_t buf_size = buf.size() - 3;
for(size_t i = 0; i != 3; ++i)
buf[i] = get_byte<u32bit>(i+1, buf_size);
return buf;
}
}
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