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/*
* X.509 CRL
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/x509_crl.h>
#include <botan/x509_ext.h>
#include <botan/x509cert.h>
#include <botan/ber_dec.h>
#include <botan/parsing.h>
#include <botan/bigint.h>
#include <botan/oids.h>
namespace Botan {
/*
* Load a X.509 CRL
*/
X509_CRL::X509_CRL(DataSource& in, bool touc) :
X509_Object(in, "X509 CRL/CRL"), throw_on_unknown_critical(touc)
{
do_decode();
}
/*
* Load a X.509 CRL
*/
X509_CRL::X509_CRL(const std::string& in, bool touc) :
X509_Object(in, "CRL/X509 CRL"), throw_on_unknown_critical(touc)
{
do_decode();
}
X509_CRL::X509_CRL(const std::vector<byte>& in, bool touc) :
X509_Object(in, "CRL/X509 CRL"), throw_on_unknown_critical(touc)
{
do_decode();
}
/**
* Check if this particular certificate is listed in the CRL
*/
bool X509_CRL::is_revoked(const X509_Certificate& cert) const
{
/*
If the cert wasn't issued by the CRL issuer, it's possible the cert
is revoked, but not by this CRL. Maybe throw an exception instead?
*/
if(cert.issuer_dn() != issuer_dn())
return false;
MemoryVector<byte> crl_akid = authority_key_id();
MemoryVector<byte> cert_akid = cert.authority_key_id();
if(!crl_akid.empty() && !cert_akid.empty())
if(crl_akid != cert_akid)
return false;
MemoryVector<byte> cert_serial = cert.serial_number();
bool is_revoked = false;
for(size_t i = 0; i != revoked.size(); ++i)
{
if(cert_serial == revoked[i].serial_number())
{
if(revoked[i].reason_code() == REMOVE_FROM_CRL)
is_revoked = false;
else
is_revoked = true;
}
}
return is_revoked;
}
/*
* Decode the TBSCertList data
*/
void X509_CRL::force_decode()
{
BER_Decoder tbs_crl(tbs_bits);
size_t version;
tbs_crl.decode_optional(version, INTEGER, UNIVERSAL);
if(version != 0 && version != 1)
throw X509_CRL_Error("Unknown X.509 CRL version " +
std::to_string(version+1));
AlgorithmIdentifier sig_algo_inner;
tbs_crl.decode(sig_algo_inner);
if(sig_algo != sig_algo_inner)
throw X509_CRL_Error("Algorithm identifier mismatch");
X509_DN dn_issuer;
tbs_crl.decode(dn_issuer);
info.add(dn_issuer.contents());
X509_Time start, end;
tbs_crl.decode(start).decode(end);
info.add("X509.CRL.start", start.readable_string());
info.add("X509.CRL.end", end.readable_string());
BER_Object next = tbs_crl.get_next_object();
if(next.type_tag == SEQUENCE && next.class_tag == CONSTRUCTED)
{
BER_Decoder cert_list(next.value);
while(cert_list.more_items())
{
CRL_Entry entry(throw_on_unknown_critical);
cert_list.decode(entry);
revoked.push_back(entry);
}
next = tbs_crl.get_next_object();
}
if(next.type_tag == 0 &&
next.class_tag == ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
{
BER_Decoder crl_options(next.value);
Extensions extensions(throw_on_unknown_critical);
crl_options.decode(extensions).verify_end();
extensions.contents_to(info, info);
next = tbs_crl.get_next_object();
}
if(next.type_tag != NO_OBJECT)
throw X509_CRL_Error("Unknown tag in CRL");
tbs_crl.verify_end();
}
/*
* Return the list of revoked certificates
*/
std::vector<CRL_Entry> X509_CRL::get_revoked() const
{
return revoked;
}
/*
* Return the distinguished name of the issuer
*/
X509_DN X509_CRL::issuer_dn() const
{
return create_dn(info);
}
/*
* Return the key identifier of the issuer
*/
std::vector<byte> X509_CRL::authority_key_id() const
{
return info.get1_memvec("X509v3.AuthorityKeyIdentifier");
}
/*
* Return the CRL number of this CRL
*/
u32bit X509_CRL::crl_number() const
{
return info.get1_u32bit("X509v3.CRLNumber");
}
/*
* Return the issue data of the CRL
*/
X509_Time X509_CRL::this_update() const
{
return info.get1("X509.CRL.start");
}
/*
* Return the date when a new CRL will be issued
*/
X509_Time X509_CRL::next_update() const
{
return info.get1("X509.CRL.end");
}
}
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