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/*************************************************
* X.509 Certificate Extensions Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/x509_ext.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/lookup.h>
#include <botan/oids.h>
#include <botan/config.h>
#include <botan/bit_ops.h>
#include <algorithm>
#include <memory>
namespace Botan {
/*************************************************
* List of X.509 Certificate Extensions *
*************************************************/
Certificate_Extension* Extensions::get_extension(const OID& oid)
{
#define X509_EXTENSION(NAME, TYPE) \
if(OIDS::name_of(oid, NAME)) \
return new Cert_Extension::TYPE();
X509_EXTENSION("X509v3.KeyUsage", Key_Usage);
X509_EXTENSION("X509v3.BasicConstraints", Basic_Constraints);
X509_EXTENSION("X509v3.SubjectKeyIdentifier", Subject_Key_ID);
X509_EXTENSION("X509v3.AuthorityKeyIdentifier", Authority_Key_ID);
X509_EXTENSION("X509v3.ExtendedKeyUsage", Extended_Key_Usage);
X509_EXTENSION("X509v3.IssuerAlternativeName", Issuer_Alternative_Name);
X509_EXTENSION("X509v3.SubjectAlternativeName", Subject_Alternative_Name);
X509_EXTENSION("X509v3.CRLNumber", CRL_Number);
X509_EXTENSION("X509v3.CertificatePolicies", Certificate_Policies);
return 0;
}
/*************************************************
* Extensions Copy Constructor *
*************************************************/
Extensions::Extensions(const Extensions& extensions) : ASN1_Object()
{
*this = extensions;
}
/*************************************************
* Extensions Assignment Operator *
*************************************************/
Extensions& Extensions::operator=(const Extensions& other)
{
for(u32bit j = 0; j != extensions.size(); ++j)
delete extensions[j];
extensions.clear();
for(u32bit j = 0; j != other.extensions.size(); ++j)
extensions.push_back(other.extensions[j]->copy());
return (*this);
}
/*************************************************
* Return the OID of this extension *
*************************************************/
OID Certificate_Extension::oid_of() const
{
return OIDS::lookup(oid_name());
}
/*************************************************
* Encode an Extensions list *
*************************************************/
void Extensions::encode_into(DER_Encoder& to_object) const
{
for(u32bit j = 0; j != extensions.size(); ++j)
{
const Certificate_Extension* ext = extensions[j];
std::string setting;
if(ext->config_id() != "")
setting = global_config().option("x509/exts/" + ext->config_id());
if(setting == "")
setting = "yes";
if(setting != "yes" && setting != "no" && setting != "critical")
throw Invalid_Argument("X509_CA:: Invalid value for option "
"x509/exts/" + ext->config_id() + " of " +
setting);
bool is_critical = (setting == "critical");
bool should_encode = ext->should_encode() && (setting != "no");
if(should_encode)
{
to_object.start_cons(SEQUENCE)
.encode(ext->oid_of())
.encode_optional(is_critical, false)
.encode(ext->encode_inner(), OCTET_STRING)
.end_cons();
}
}
}
/*************************************************
* Decode a list of Extensions *
*************************************************/
void Extensions::decode_from(BER_Decoder& from_source)
{
for(u32bit j = 0; j != extensions.size(); ++j)
delete extensions[j];
extensions.clear();
BER_Decoder sequence = from_source.start_cons(SEQUENCE);
while(sequence.more_items())
{
OID oid;
MemoryVector<byte> value;
bool critical;
sequence.start_cons(SEQUENCE)
.decode(oid)
.decode_optional(critical, BOOLEAN, UNIVERSAL, false)
.decode(value, OCTET_STRING)
.verify_end()
.end_cons();
Certificate_Extension* ext = get_extension(oid);
if(!ext)
{
if(!critical || !should_throw)
continue;
throw Decoding_Error("Encountered unknown X.509 extension marked "
"as critical; OID = " + oid.as_string());
}
ext->decode_inner(value);
extensions.push_back(ext);
}
sequence.verify_end();
}
/*************************************************
* Write the extensions to an info store *
*************************************************/
void Extensions::contents_to(Data_Store& subject_info,
Data_Store& issuer_info) const
{
for(u32bit j = 0; j != extensions.size(); ++j)
extensions[j]->contents_to(subject_info, issuer_info);
}
/*************************************************
* Delete an Extensions list *
*************************************************/
Extensions::~Extensions()
{
for(u32bit j = 0; j != extensions.size(); ++j)
delete extensions[j];
}
namespace Cert_Extension {
/*************************************************
* Checked accessor for the path_limit member *
*************************************************/
u32bit Basic_Constraints::get_path_limit() const
{
if(!is_ca)
throw Invalid_State("Basic_Constraints::get_path_limit: Not a CA");
return path_limit;
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Basic_Constraints::encode_inner() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode_if(is_ca,
DER_Encoder()
.encode(is_ca)
.encode_optional(path_limit, NO_CERT_PATH_LIMIT)
)
.end_cons()
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Basic_Constraints::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in)
.start_cons(SEQUENCE)
.decode_optional(is_ca, BOOLEAN, UNIVERSAL, false)
.decode_optional(path_limit, INTEGER, UNIVERSAL, NO_CERT_PATH_LIMIT)
.verify_end()
.end_cons();
if(is_ca == false)
path_limit = 0;
}
/*************************************************
* Return a textual representation *
*************************************************/
void Basic_Constraints::contents_to(Data_Store& subject, Data_Store&) const
{
subject.add("X509v3.BasicConstraints.is_ca", (is_ca ? 1 : 0));
subject.add("X509v3.BasicConstraints.path_constraint", path_limit);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Key_Usage::encode_inner() const
{
if(constraints == NO_CONSTRAINTS)
throw Encoding_Error("Cannot encode zero usage constraints");
const u32bit unused_bits = low_bit(constraints) - 1;
SecureVector<byte> der;
der.append(BIT_STRING);
der.append(2 + ((unused_bits < 8) ? 1 : 0));
der.append(unused_bits % 8);
der.append((constraints >> 8) & 0xFF);
if(constraints & 0xFF)
der.append(constraints & 0xFF);
return der;
}
/*************************************************
* Decode the extension *
*************************************************/
void Key_Usage::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder ber(in);
BER_Object obj = ber.get_next_object();
if(obj.type_tag != BIT_STRING || obj.class_tag != UNIVERSAL)
throw BER_Bad_Tag("Bad tag for usage constraint",
obj.type_tag, obj.class_tag);
if(obj.value.size() != 2 && obj.value.size() != 3)
throw BER_Decoding_Error("Bad size for BITSTRING in usage constraint");
if(obj.value[0] >= 8)
throw BER_Decoding_Error("Invalid unused bits in usage constraint");
obj.value[obj.value.size()-1] &= (0xFF << obj.value[0]);
u16bit usage = 0;
for(u32bit j = 1; j != obj.value.size(); ++j)
usage = (obj.value[j] << 8) | usage;
constraints = Key_Constraints(usage);
}
/*************************************************
* Return a textual representation *
*************************************************/
void Key_Usage::contents_to(Data_Store& subject, Data_Store&) const
{
subject.add("X509v3.KeyUsage", constraints);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Subject_Key_ID::encode_inner() const
{
return DER_Encoder().encode(key_id, OCTET_STRING).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Subject_Key_ID::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in).decode(key_id, OCTET_STRING).verify_end();
}
/*************************************************
* Return a textual representation *
*************************************************/
void Subject_Key_ID::contents_to(Data_Store& subject, Data_Store&) const
{
subject.add("X509v3.SubjectKeyIdentifier", key_id);
}
/*************************************************
* Subject_Key_ID Constructor *
*************************************************/
Subject_Key_ID::Subject_Key_ID(const MemoryRegion<byte>& pub_key)
{
std::auto_ptr<HashFunction> hash(get_hash("SHA-1"));
key_id = hash->process(pub_key);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Authority_Key_ID::encode_inner() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(key_id, OCTET_STRING, ASN1_Tag(0), CONTEXT_SPECIFIC)
.end_cons()
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Authority_Key_ID::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in)
.start_cons(SEQUENCE)
.decode_optional_string(key_id, OCTET_STRING, 0);
}
/*************************************************
* Return a textual representation *
*************************************************/
void Authority_Key_ID::contents_to(Data_Store&, Data_Store& issuer) const
{
if(key_id.size())
issuer.add("X509v3.AuthorityKeyIdentifier", key_id);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Alternative_Name::encode_inner() const
{
return DER_Encoder().encode(alt_name).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Alternative_Name::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in).decode(alt_name);
}
/*************************************************
* Return a textual representation *
*************************************************/
void Alternative_Name::contents_to(Data_Store& subject_info,
Data_Store& issuer_info) const
{
std::multimap<std::string, std::string> contents =
get_alt_name().contents();
if(oid_name_str == "X509v3.SubjectAlternativeName")
subject_info.add(contents);
else if(oid_name_str == "X509v3.IssuerAlternativeName")
issuer_info.add(contents);
else
throw Internal_Error("In Alternative_Name, unknown type " +
oid_name_str);
}
/*************************************************
* Alternative_Name Constructor *
*************************************************/
Alternative_Name::Alternative_Name(const AlternativeName& alt_name,
const std::string& oid_name_str,
const std::string& config_name_str)
{
this->alt_name = alt_name;
this->oid_name_str = oid_name_str;
this->config_name_str = config_name_str;
}
/*************************************************
* Subject_Alternative_Name Constructor *
*************************************************/
Subject_Alternative_Name::Subject_Alternative_Name(
const AlternativeName& name) :
Alternative_Name(name, "X509v3.SubjectAlternativeName",
"subject_alternative_name")
{
}
/*************************************************
* Issuer_Alternative_Name Constructor *
*************************************************/
Issuer_Alternative_Name::Issuer_Alternative_Name(const AlternativeName& name) :
Alternative_Name(name, "X509v3.IssuerAlternativeName",
"issuer_alternative_name")
{
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Extended_Key_Usage::encode_inner() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode_list(oids)
.end_cons()
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Extended_Key_Usage::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in)
.start_cons(SEQUENCE)
.decode_list(oids)
.end_cons();
}
/*************************************************
* Return a textual representation *
*************************************************/
void Extended_Key_Usage::contents_to(Data_Store& subject, Data_Store&) const
{
for(u32bit j = 0; j != oids.size(); ++j)
subject.add("X509v3.ExtendedKeyUsage", oids[j].as_string());
}
namespace {
/*************************************************
* A policy specifier *
*************************************************/
class Policy_Information : public ASN1_Object
{
public:
OID oid;
void encode_into(DER_Encoder& codec) const
{
codec.start_cons(SEQUENCE)
.encode(oid)
.end_cons();
}
void decode_from(BER_Decoder& codec)
{
codec.start_cons(SEQUENCE)
.decode(oid)
.discard_remaining()
.end_cons();
}
};
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> Certificate_Policies::encode_inner() const
{
throw Exception("Certificate_Policies::encode_inner: Bugged");
std::vector<Policy_Information> policies;
return DER_Encoder()
.start_cons(SEQUENCE)
.encode_list(policies)
.end_cons()
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void Certificate_Policies::decode_inner(const MemoryRegion<byte>& in)
{
std::vector<Policy_Information> policies;
BER_Decoder(in)
.start_cons(SEQUENCE)
.decode_list(policies)
.end_cons();
}
/*************************************************
* Return a textual representation *
*************************************************/
void Certificate_Policies::contents_to(Data_Store& info, Data_Store&) const
{
for(u32bit j = 0; j != oids.size(); ++j)
info.add("X509v3.ExtendedKeyUsage", oids[j].as_string());
}
/*************************************************
* Checked accessor for the crl_number member *
*************************************************/
u32bit CRL_Number::get_crl_number() const
{
if(!has_value)
throw Invalid_State("CRL_Number::get_crl_number: Not set");
return crl_number;
}
/*************************************************
* Copy a CRL_Number extension *
*************************************************/
CRL_Number* CRL_Number::copy() const
{
if(!has_value)
throw Invalid_State("CRL_Number::copy: Not set");
return new CRL_Number(crl_number);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> CRL_Number::encode_inner() const
{
return DER_Encoder().encode(crl_number).get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void CRL_Number::decode_inner(const MemoryRegion<byte>& in)
{
BER_Decoder(in).decode(crl_number);
}
/*************************************************
* Return a textual representation *
*************************************************/
void CRL_Number::contents_to(Data_Store& info, Data_Store&) const
{
info.add("X509v3.CRLNumber", crl_number);
}
/*************************************************
* Encode the extension *
*************************************************/
MemoryVector<byte> CRL_ReasonCode::encode_inner() const
{
return DER_Encoder()
.encode(static_cast<u32bit>(reason), ENUMERATED, UNIVERSAL)
.get_contents();
}
/*************************************************
* Decode the extension *
*************************************************/
void CRL_ReasonCode::decode_inner(const MemoryRegion<byte>& in)
{
u32bit reason_code = 0;
BER_Decoder(in).decode(reason_code, ENUMERATED, UNIVERSAL);
reason = static_cast<CRL_Code>(reason_code);
}
/*************************************************
* Return a textual representation *
*************************************************/
void CRL_ReasonCode::contents_to(Data_Store& info, Data_Store&) const
{
info.add("X509v3.CRLReasonCode", reason);
}
}
}
|