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/*
* X.509 CRL
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/x509_crl.h>
#include <botan/x509_ext.h>
#include <botan/x509cert.h>
#include <botan/ber_dec.h>
namespace Botan {
struct CRL_Data
{
X509_DN m_issuer;
X509_Time m_this_update;
X509_Time m_next_update;
std::vector<CRL_Entry> m_entries;
Extensions m_extensions;
// cached values from extensions
size_t m_crl_number = 0;
std::vector<uint8_t> m_auth_key_id;
};
std::string X509_CRL::PEM_label() const
{
return "X509 CRL";
}
std::vector<std::string> X509_CRL::alternate_PEM_labels() const
{
return { "CRL" };
}
X509_CRL::X509_CRL(DataSource& src)
{
load_data(src);
}
X509_CRL::X509_CRL(const std::vector<uint8_t>& vec)
{
DataSource_Memory src(vec.data(), vec.size());
load_data(src);
}
#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
X509_CRL::X509_CRL(const std::string& fsname)
{
DataSource_Stream src(fsname, true);
load_data(src);
}
#endif
X509_CRL::X509_CRL(const X509_DN& issuer,
const X509_Time& this_update,
const X509_Time& next_update,
const std::vector<CRL_Entry>& revoked) :
X509_Object()
{
m_data.reset(new CRL_Data);
m_data->m_issuer = issuer;
m_data->m_this_update = this_update;
m_data->m_next_update = next_update;
m_data->m_entries = revoked;
}
/**
* 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;
std::vector<uint8_t> crl_akid = authority_key_id();
std::vector<uint8_t> cert_akid = cert.authority_key_id();
if(!crl_akid.empty() && !cert_akid.empty())
{
if(crl_akid != cert_akid)
return false;
}
std::vector<uint8_t> cert_serial = cert.serial_number();
bool is_revoked = false;
// FIXME would be nice to avoid a linear scan here - maybe sort the entries?
for(const CRL_Entry& entry : get_revoked())
{
if(cert_serial == entry.serial_number())
{
if(entry.reason_code() == REMOVE_FROM_CRL)
is_revoked = false;
else
is_revoked = true;
}
}
return is_revoked;
}
/*
* Decode the TBSCertList data
*/
namespace {
std::unique_ptr<CRL_Data> decode_crl_body(const std::vector<uint8_t>& body,
const AlgorithmIdentifier& sig_algo)
{
std::unique_ptr<CRL_Data> data(new CRL_Data);
BER_Decoder tbs_crl(body);
size_t version;
tbs_crl.decode_optional(version, INTEGER, UNIVERSAL);
if(version != 0 && version != 1)
throw X509_CRL::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::X509_CRL_Error("Algorithm identifier mismatch");
tbs_crl.decode(data->m_issuer)
.decode(data->m_this_update)
.decode(data->m_next_update);
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;
cert_list.decode(entry);
data->m_entries.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);
crl_options.decode(data->m_extensions).verify_end();
next = tbs_crl.get_next_object();
}
if(next.type_tag != NO_OBJECT)
throw X509_CRL::X509_CRL_Error("Unknown tag in CRL");
tbs_crl.verify_end();
return data;
}
}
void X509_CRL::force_decode()
{
m_data.reset(decode_crl_body(signed_body(), signature_algorithm()).release());
}
const CRL_Data& X509_CRL::data() const
{
if(!m_data)
{
throw Invalid_State("X509_CRL uninitialized");
}
return *m_data.get();
}
const Extensions& X509_CRL::extensions() const
{
return data().m_extensions;
}
/*
* Return the list of revoked certificates
*/
const std::vector<CRL_Entry>& X509_CRL::get_revoked() const
{
return data().m_entries;
}
/*
* Return the distinguished name of the issuer
*/
const X509_DN& X509_CRL::issuer_dn() const
{
return data().m_issuer;
}
/*
* Return the key identifier of the issuer
*/
const std::vector<uint8_t>& X509_CRL::authority_key_id() const
{
return data().m_auth_key_id;
}
/*
* Return the CRL number of this CRL
*/
uint32_t X509_CRL::crl_number() const
{
return data().m_crl_number;
}
/*
* Return the issue data of the CRL
*/
const X509_Time& X509_CRL::this_update() const
{
return data().m_this_update;
}
/*
* Return the date when a new CRL will be issued
*/
const X509_Time& X509_CRL::next_update() const
{
return data().m_next_update;
}
}
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