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/*************************************************
* X.509 Certificate Authority Source File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#include <botan/x509_ca.h>
#include <botan/x509stor.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/config.h>
#include <botan/lookup.h>
#include <botan/look_pk.h>
#include <botan/numthry.h>
#include <botan/oids.h>
#include <botan/util.h>
#include <algorithm>
#include <typeinfo>
#include <memory>
#include <set>
namespace Botan {
/*************************************************
* Load the certificate and private key *
*************************************************/
X509_CA::X509_CA(const X509_Certificate& c,
const Private_Key& key) : cert(c)
{
const Private_Key* key_pointer = &key;
if(!dynamic_cast<const PK_Signing_Key*>(key_pointer))
throw Invalid_Argument("X509_CA: " + key.algo_name() + " cannot sign");
if(!cert.is_CA_cert())
throw Invalid_Argument("X509_CA: This certificate is not for a CA");
signer = choose_sig_format(key, ca_sig_algo);
}
/*************************************************
* Sign a PKCS #10 certificate request *
*************************************************/
X509_Certificate X509_CA::sign_request(const PKCS10_Request& req,
u32bit expire_time) const
{
if(req.is_CA() && !global_config().option_as_bool("x509/ca/allow_ca"))
throw Policy_Violation("X509_CA: Attempted to sign new CA certificate");
Key_Constraints constraints;
if(req.is_CA())
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
else
{
std::auto_ptr<Public_Key> key(req.subject_public_key());
constraints = X509::find_constraints(*key, req.constraints());
}
Extensions extensions;
extensions.add(new Cert_Extension::Authority_Key_ID(cert.subject_key_id()));
extensions.add(new Cert_Extension::Subject_Key_ID(req.raw_public_key()));
extensions.add(
new Cert_Extension::Basic_Constraints(req.is_CA(), req.path_limit()));
extensions.add(new Cert_Extension::Key_Usage(constraints));
extensions.add(
new Cert_Extension::Extended_Key_Usage(req.ex_constraints()));
extensions.add(
new Cert_Extension::Subject_Alternative_Name(req.subject_alt_name()));
/*
extensions.add(
new Cert_Extension::Issuer_Alternative_Name(issuer_alt));
*/
if(expire_time == 0)
expire_time = global_config().option_as_time("x509/ca/default_expire");
const u64bit current_time = system_time();
return make_cert(signer, ca_sig_algo, req.raw_public_key(),
X509_Time(current_time),
X509_Time(current_time + expire_time),
cert.subject_dn(), req.subject_dn(),
extensions);
}
/*************************************************
* Create a new certificate *
*************************************************/
X509_Certificate X509_CA::make_cert(PK_Signer* signer,
const AlgorithmIdentifier& sig_algo,
const MemoryRegion<byte>& pub_key,
const X509_Time& not_before,
const X509_Time& not_after,
const X509_DN& issuer_dn,
const X509_DN& subject_dn,
const Extensions& extensions)
{
const u32bit X509_CERT_VERSION = 3;
const u32bit SERIAL_BITS = 128;
DataSource_Memory source(X509_Object::make_signed(signer, sig_algo,
DER_Encoder().start_cons(SEQUENCE)
.start_explicit(0)
.encode(X509_CERT_VERSION-1)
.end_explicit()
.encode(random_integer(SERIAL_BITS))
.encode(sig_algo)
.encode(issuer_dn)
.start_cons(SEQUENCE)
.encode(not_before)
.encode(not_after)
.end_cons()
.encode(subject_dn)
.raw_bytes(pub_key)
.start_explicit(3)
.start_cons(SEQUENCE)
.encode(extensions)
.end_cons()
.end_explicit()
.end_cons()
.get_contents()
));
return X509_Certificate(source);
}
/*************************************************
* Create a new, empty CRL *
*************************************************/
X509_CRL X509_CA::new_crl(u32bit next_update) const
{
std::vector<CRL_Entry> empty;
return make_crl(empty, 1, next_update);
}
/*************************************************
* Update a CRL with new entries *
*************************************************/
X509_CRL X509_CA::update_crl(const X509_CRL& crl,
const std::vector<CRL_Entry>& new_revoked,
u32bit next_update) const
{
std::vector<CRL_Entry> already_revoked = crl.get_revoked();
std::vector<CRL_Entry> all_revoked;
X509_Store store;
store.add_cert(cert, true);
if(store.add_crl(crl) != VERIFIED)
throw Invalid_Argument("X509_CA::update_crl: Invalid CRL provided");
std::set<SecureVector<byte> > removed_from_crl;
for(u32bit j = 0; j != new_revoked.size(); ++j)
{
if(new_revoked[j].reason_code() == DELETE_CRL_ENTRY)
removed_from_crl.insert(new_revoked[j].serial_number());
else
all_revoked.push_back(new_revoked[j]);
}
for(u32bit j = 0; j != already_revoked.size(); ++j)
{
std::set<SecureVector<byte> >::const_iterator i;
i = removed_from_crl.find(already_revoked[j].serial_number());
if(i == removed_from_crl.end())
all_revoked.push_back(already_revoked[j]);
}
std::sort(all_revoked.begin(), all_revoked.end());
std::vector<CRL_Entry> cert_list;
std::unique_copy(all_revoked.begin(), all_revoked.end(),
std::back_inserter(cert_list));
return make_crl(cert_list, crl.crl_number() + 1, next_update);
}
/*************************************************
* Create a CRL *
*************************************************/
X509_CRL X509_CA::make_crl(const std::vector<CRL_Entry>& revoked,
u32bit crl_number, u32bit next_update) const
{
const u32bit X509_CRL_VERSION = 2;
if(next_update == 0)
next_update = global_config().option_as_time("x509/crl/next_update");
const u64bit current_time = system_time();
Extensions extensions;
extensions.add(
new Cert_Extension::Authority_Key_ID(cert.subject_key_id()));
extensions.add(new Cert_Extension::CRL_Number(crl_number));
DataSource_Memory source(X509_Object::make_signed(signer, ca_sig_algo,
DER_Encoder().start_cons(SEQUENCE)
.encode(X509_CRL_VERSION-1)
.encode(ca_sig_algo)
.encode(cert.issuer_dn())
.encode(X509_Time(current_time))
.encode(X509_Time(current_time + next_update))
.encode_if(revoked.size() > 0,
DER_Encoder()
.start_cons(SEQUENCE)
.encode_list(revoked)
.end_cons()
)
.start_explicit(0)
.start_cons(SEQUENCE)
.encode(extensions)
.end_cons()
.end_explicit()
.end_cons()
.get_contents()
));
return X509_CRL(source);
}
/*************************************************
* Return the CA's certificate *
*************************************************/
X509_Certificate X509_CA::ca_certificate() const
{
return cert;
}
/*************************************************
* X509_CA Destructor *
*************************************************/
X509_CA::~X509_CA()
{
delete signer;
}
/*************************************************
* Choose a signing format for the key *
*************************************************/
PK_Signer* choose_sig_format(const Private_Key& key,
AlgorithmIdentifier& sig_algo)
{
std::string padding;
Signature_Format format;
Config::choose_sig_format(key.algo_name(), padding, format);
sig_algo.oid = OIDS::lookup(key.algo_name() + "/" + padding);
std::auto_ptr<X509_Encoder> encoding(key.x509_encoder());
if(!encoding.get())
throw Encoding_Error("Key " + key.algo_name() + " does not support "
"X.509 encoding");
sig_algo.parameters = encoding->alg_id().parameters;
const PK_Signing_Key& sig_key = dynamic_cast<const PK_Signing_Key&>(key);
return get_pk_signer(sig_key, padding, format);
}
}
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