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/*************************************************
* X.509 Certificate Authority Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/x509_ca.h>
#include <botan/x509_ext.h>
#include <botan/x509stor.h>
#include <botan/conf.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 <memory>
#include <set>
namespace Botan {
/*************************************************
* Load the certificate and private key *
*************************************************/
X509_CA::X509_CA(const X509_Certificate& c,
const PKCS8_PrivateKey& key) : cert(c)
{
const PKCS8_PrivateKey* 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");
std::string padding;
Signature_Format format;
Config::choose_sig_format(key.algo_name(), padding, format);
ca_sig_algo.oid = OIDS::lookup(key.algo_name() + "/" + padding);
ca_sig_algo.parameters = key.DER_encode_params();
const PK_Signing_Key& sig_key = dynamic_cast<const PK_Signing_Key&>(key);
signer = get_pk_signer(sig_key, padding, format);
}
/*************************************************
* Sign a PKCS #10 certificate request *
*************************************************/
X509_Certificate X509_CA::sign_request(const PKCS10_Request& req,
u32bit expire_time) const
{
if(req.is_CA() && !Config::get_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<X509_PublicKey> key(req.subject_public_key());
constraints = X509::find_constraints(*key, req.constraints());
}
if(expire_time == 0)
expire_time = Config::get_time("x509/ca/default_expire");
const u64bit current_time = system_time();
X509_Time not_before(current_time);
X509_Time not_after(current_time + expire_time);
return make_cert(signer, ca_sig_algo, req.raw_public_key(),
cert.subject_key_id(), not_before, not_after,
cert.subject_dn(), req.subject_dn(),
req.is_CA(), req.path_limit(), req.subject_alt_name(),
AlternativeName(), constraints, req.ex_constraints());
}
/*************************************************
* Create a new certificate *
*************************************************/
X509_Certificate X509_CA::make_cert(PK_Signer* signer,
const AlgorithmIdentifier& sig_algo,
const MemoryRegion<byte>& pub_key,
const MemoryRegion<byte>& auth_key_id,
const X509_Time& not_before,
const X509_Time& not_after,
const X509_DN& issuer_dn,
const X509_DN& subject_dn,
bool is_CA, u32bit path_limit,
const AlternativeName& subject_alt,
const AlternativeName& issuer_alt,
Key_Constraints constraints,
const std::vector<OID>& ex_constraints)
{
const u32bit X509_CERT_VERSION = 2;
const u32bit SERIAL_BITS = 128;
Extensions extensions;
extensions.add(new Cert_Extension::Subject_Key_ID(pub_key));
extensions.add(new Cert_Extension::Authority_Key_ID(auth_key_id));
extensions.add(
new Cert_Extension::Basic_Constraints(is_CA, path_limit));
extensions.add(new Cert_Extension::Key_Usage(constraints));
extensions.add(
new Cert_Extension::Extended_Key_Usage(ex_constraints));
extensions.add(
new Cert_Extension::Alternative_Name(subject_alt,
"X509v3.SubjectAlternativeName",
"subject_alternative_name")
);
extensions.add(
new Cert_Extension::Alternative_Name(issuer_alt,
"X509v3.IssuerAlternativeName",
"issuer_alternative_name")
);
MemoryVector<byte> tbs_bits =
DER_Encoder().start_sequence()
.start_explicit(ASN1_Tag(0))
.encode(X509_CERT_VERSION)
.end_explicit(ASN1_Tag(0))
.encode(random_integer(SERIAL_BITS))
.encode(sig_algo)
.encode(issuer_dn)
.start_sequence()
.encode(not_before)
.encode(not_after)
.end_sequence()
.encode(subject_dn)
.add_raw_octets(pub_key)
.start_explicit(ASN1_Tag(3))
.start_sequence()
.encode(extensions)
.end_sequence()
.end_explicit(ASN1_Tag(3))
.end_sequence()
.get_contents();
DataSource_Memory source(
DER_Encoder()
.start_sequence()
.add_raw_octets(tbs_bits)
.encode(sig_algo)
.encode(signer->sign_message(tbs_bits), BIT_STRING)
.end_sequence()
.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 == DELETE_CRL_ENTRY)
removed_from_crl.insert(new_revoked[j].serial);
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);
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 = 1;
if(next_update == 0)
next_update = Config::get_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));
DER_Encoder tbs_crl;
tbs_crl
.start_sequence()
.encode(X509_CRL_VERSION)
.encode(ca_sig_algo)
.encode(cert.subject_dn())
.encode(X509_Time(current_time))
.encode(X509_Time(current_time + next_update));
if(revoked.size())
{
tbs_crl.start_sequence();
for(u32bit j = 0; j != revoked.size(); ++j)
DER::encode(tbs_crl, revoked[j]);
tbs_crl.end_sequence();
}
tbs_crl
.start_explicit(ASN1_Tag(0))
.start_sequence()
.encode(extensions)
.end_sequence()
.end_explicit(ASN1_Tag(0))
.end_sequence();
MemoryVector<byte> tbs_bits = tbs_crl.get_contents();
MemoryVector<byte> sig = signer->sign_message(tbs_bits);
DataSource_Memory source(
DER_Encoder()
.start_sequence()
.add_raw_octets(tbs_bits)
.encode(ca_sig_algo)
.encode(sig, BIT_STRING)
.end_sequence()
.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;
}
}
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