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/*************************************************
* X.509 Certificates Source File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#include <botan/x509cert.h>
#include <botan/x509_ext.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/stl_util.h>
#include <botan/parsing.h>
#include <botan/bigint.h>
#include <botan/oids.h>
#include <botan/pem.h>
#include <algorithm>
namespace Botan {
namespace {
/*************************************************
* Lookup each OID in the vector *
*************************************************/
std::vector<std::string> lookup_oids(const std::vector<std::string>& in)
{
std::vector<std::string> out;
std::vector<std::string>::const_iterator i = in.begin();
while(i != in.end())
{
out.push_back(OIDS::lookup(OID(*i)));
++i;
}
return out;
}
}
/*************************************************
* X509_Certificate Constructor *
*************************************************/
X509_Certificate::X509_Certificate(DataSource& in) :
X509_Object(in, "CERTIFICATE/X509 CERTIFICATE")
{
self_signed = false;
do_decode();
}
/*************************************************
* X509_Certificate Constructor *
*************************************************/
X509_Certificate::X509_Certificate(const std::string& in) :
X509_Object(in, "CERTIFICATE/X509 CERTIFICATE")
{
self_signed = false;
do_decode();
}
/*************************************************
* Decode the TBSCertificate data *
*************************************************/
void X509_Certificate::force_decode()
{
u32bit version;
BigInt serial_bn;
AlgorithmIdentifier sig_algo_inner;
X509_DN dn_issuer, dn_subject;
X509_Time start, end;
BER_Decoder tbs_cert(tbs_bits);
tbs_cert.decode_optional(version, ASN1_Tag(0),
ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
.decode(serial_bn)
.decode(sig_algo_inner)
.decode(dn_issuer)
.start_cons(SEQUENCE)
.decode(start)
.decode(end)
.verify_end()
.end_cons()
.decode(dn_subject);
if(version > 2)
throw Decoding_Error("Unknown X.509 cert version " + to_string(version));
if(sig_algo != sig_algo_inner)
throw Decoding_Error("Algorithm identifier mismatch");
self_signed = (dn_subject == dn_issuer);
subject.add(dn_subject.contents());
issuer.add(dn_issuer.contents());
BER_Object public_key = tbs_cert.get_next_object();
if(public_key.type_tag != SEQUENCE || public_key.class_tag != CONSTRUCTED)
throw BER_Bad_Tag("X509_Certificate: Unexpected tag for public key",
public_key.type_tag, public_key.class_tag);
MemoryVector<byte> v2_issuer_key_id, v2_subject_key_id;
tbs_cert.decode_optional_string(v2_issuer_key_id, BIT_STRING, 1);
tbs_cert.decode_optional_string(v2_subject_key_id, BIT_STRING, 2);
BER_Object v3_exts_data = tbs_cert.get_next_object();
if(v3_exts_data.type_tag == 3 &&
v3_exts_data.class_tag == ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
{
Extensions extensions;
BER_Decoder(v3_exts_data.value).decode(extensions).verify_end();
extensions.contents_to(subject, issuer);
}
else if(v3_exts_data.type_tag != NO_OBJECT)
throw BER_Bad_Tag("Unknown tag in X.509 cert",
v3_exts_data.type_tag, v3_exts_data.class_tag);
if(tbs_cert.more_items())
throw Decoding_Error("TBSCertificate has more items that expected");
subject.add("X509.Certificate.version", version);
subject.add("X509.Certificate.serial", BigInt::encode(serial_bn));
subject.add("X509.Certificate.start", start.readable_string());
subject.add("X509.Certificate.end", end.readable_string());
issuer.add("X509.Certificate.v2.key_id", v2_issuer_key_id);
subject.add("X509.Certificate.v2.key_id", v2_subject_key_id);
subject.add("X509.Certificate.public_key",
PEM_Code::encode(
ASN1::put_in_sequence(public_key.value),
"PUBLIC KEY"
)
);
if(is_CA_cert() &&
!subject.has_value("X509v3.BasicConstraints.path_constraint"))
{
u32bit limit = (x509_version() < 3) ? NO_CERT_PATH_LIMIT : 0;
subject.add("X509v3.BasicConstraints.path_constraint", limit);
}
}
/*************************************************
* Return the X.509 version in use *
*************************************************/
u32bit X509_Certificate::x509_version() const
{
return (subject.get1_u32bit("X509.Certificate.version") + 1);
}
/*************************************************
* Return the time this cert becomes valid *
*************************************************/
std::string X509_Certificate::start_time() const
{
return subject.get1("X509.Certificate.start");
}
/*************************************************
* Return the time this cert becomes invalid *
*************************************************/
std::string X509_Certificate::end_time() const
{
return subject.get1("X509.Certificate.end");
}
/*************************************************
* Return information about the subject *
*************************************************/
std::vector<std::string>
X509_Certificate::subject_info(const std::string& what) const
{
return subject.get(X509_DN::deref_info_field(what));
}
/*************************************************
* Return information about the issuer *
*************************************************/
std::vector<std::string>
X509_Certificate::issuer_info(const std::string& what) const
{
return issuer.get(X509_DN::deref_info_field(what));
}
/*************************************************
* Return the public key in this certificate *
*************************************************/
Public_Key* X509_Certificate::subject_public_key() const
{
DataSource_Memory source(subject.get1("X509.Certificate.public_key"));
return X509::load_key(source);
}
/*************************************************
* Check if the certificate is for a CA *
*************************************************/
bool X509_Certificate::is_CA_cert() const
{
if(!subject.get1_u32bit("X509v3.BasicConstraints.is_ca"))
return false;
if((constraints() & KEY_CERT_SIGN) || (constraints() == NO_CONSTRAINTS))
return true;
return false;
}
/*************************************************
* Return the path length constraint *
*************************************************/
u32bit X509_Certificate::path_limit() const
{
return subject.get1_u32bit("X509v3.BasicConstraints.path_constraint", 0);
}
/*************************************************
* Return the key usage constraints *
*************************************************/
Key_Constraints X509_Certificate::constraints() const
{
return Key_Constraints(subject.get1_u32bit("X509v3.KeyUsage",
NO_CONSTRAINTS));
}
/*************************************************
* Return the list of extended key usage OIDs *
*************************************************/
std::vector<std::string> X509_Certificate::ex_constraints() const
{
return lookup_oids(subject.get("X509v3.ExtendedKeyUsage"));
}
/*************************************************
* Return the list of certificate policies *
*************************************************/
std::vector<std::string> X509_Certificate::policies() const
{
return lookup_oids(subject.get("X509v3.CertificatePolicies"));
}
/*************************************************
* Return the authority key id *
*************************************************/
MemoryVector<byte> X509_Certificate::authority_key_id() const
{
return issuer.get1_memvec("X509v3.AuthorityKeyIdentifier");
}
/*************************************************
* Return the subject key id *
*************************************************/
MemoryVector<byte> X509_Certificate::subject_key_id() const
{
return subject.get1_memvec("X509v3.SubjectKeyIdentifier");
}
/*************************************************
* Return the certificate serial number *
*************************************************/
MemoryVector<byte> X509_Certificate::serial_number() const
{
return subject.get1_memvec("X509.Certificate.serial");
}
/*************************************************
* Return the distinguished name of the issuer *
*************************************************/
X509_DN X509_Certificate::issuer_dn() const
{
return create_dn(issuer);
}
/*************************************************
* Return the distinguished name of the subject *
*************************************************/
X509_DN X509_Certificate::subject_dn() const
{
return create_dn(subject);
}
/*************************************************
* Compare two certificates for equality *
*************************************************/
bool X509_Certificate::operator==(const X509_Certificate& other) const
{
return (sig == other.sig &&
sig_algo == other.sig_algo &&
self_signed == other.self_signed &&
issuer == other.issuer &&
subject == other.subject);
}
/*************************************************
* X.509 Certificate Comparison *
*************************************************/
bool operator!=(const X509_Certificate& cert1, const X509_Certificate& cert2)
{
return !(cert1 == cert2);
}
/*************************************************
* Create and populate a X509_DN *
*************************************************/
X509_DN create_dn(const Data_Store& info)
{
class DN_Matcher : public Data_Store::Matcher
{
public:
bool operator()(const std::string& key, const std::string&) const
{
if(key.find("X520.") != std::string::npos)
return true;
return false;
}
};
std::multimap<std::string, std::string> names =
info.search_with(DN_Matcher());
X509_DN dn;
std::multimap<std::string, std::string>::iterator j;
for(j = names.begin(); j != names.end(); ++j)
dn.add_attribute(j->first, j->second);
return dn;
}
/*************************************************
* Create and populate an AlternativeName *
*************************************************/
AlternativeName create_alt_name(const Data_Store& info)
{
class AltName_Matcher : public Data_Store::Matcher
{
public:
bool operator()(const std::string& key, const std::string&) const
{
for(u32bit j = 0; j != matches.size(); ++j)
if(key.compare(matches[j]) == 0)
return true;
return false;
}
AltName_Matcher(const std::string& match_any_of)
{
matches = split_on(match_any_of, '/');
}
private:
std::vector<std::string> matches;
};
std::multimap<std::string, std::string> names =
info.search_with(AltName_Matcher("RFC822/DNS/URI"));
AlternativeName alt_name;
std::multimap<std::string, std::string>::iterator j;
for(j = names.begin(); j != names.end(); ++j)
alt_name.add_attribute(j->first, j->second);
return alt_name;
}
}
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