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/*************************************************
* X.509 Certificate Authority Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/x509self.h>
#include <botan/x509_ca.h>
#include <botan/conf.h>
#include <botan/look_pk.h>
#include <botan/oids.h>
#include <botan/pipe.h>
#include <memory>
namespace Botan {
namespace {
/*************************************************
* Shared setup for self-signed items *
*************************************************/
MemoryVector<byte> shared_setup(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
const PKCS8_PrivateKey* key_pointer = &key;
if(!dynamic_cast<const PK_Signing_Key*>(key_pointer))
throw Invalid_Argument("Key type " + key.algo_name() + " cannot sign");
opts.sanity_check();
Pipe key_encoder;
key_encoder.start_msg();
X509::encode(key, key_encoder, RAW_BER);
key_encoder.end_msg();
return key_encoder.read_all();
}
/*************************************************
* Load information from the X509_Cert_Options *
*************************************************/
void load_info(const X509_Cert_Options& opts, X509_DN& subject_dn,
AlternativeName& subject_alt)
{
subject_dn.add_attribute("X520.CommonName", opts.common_name);
subject_dn.add_attribute("X520.Country", opts.country);
subject_dn.add_attribute("X520.State", opts.state);
subject_dn.add_attribute("X520.Locality", opts.locality);
subject_dn.add_attribute("X520.Organization", opts.organization);
subject_dn.add_attribute("X520.OrganizationalUnit", opts.org_unit);
subject_dn.add_attribute("X520.SerialNumber", opts.serial_number);
subject_alt = AlternativeName(opts.email, opts.uri, opts.dns);
subject_alt.add_othername(OIDS::lookup("PKIX.XMPPAddr"),
opts.xmpp, UTF8_STRING);
}
/*************************************************
* Choose a signing format for the key *
*************************************************/
PK_Signer* choose_sig_format(const PKCS8_PrivateKey& key,
AlgorithmIdentifier& sig_algo)
{
std::string padding;
Signature_Format format;
Config::choose_sig_format(key.algo_name(), padding, format);
sig_algo.oid = OIDS::lookup(key.algo_name() + "/" + padding);
sig_algo.parameters = key.DER_encode_params();
const PK_Signing_Key& sig_key = dynamic_cast<const PK_Signing_Key&>(key);
return get_pk_signer(sig_key, padding, format);
}
/*************************************************
* Encode an attribute for PKCS #10 request *
*************************************************/
void do_attribute(DER_Encoder& tbs_req, DER_Encoder& attr_bits,
const std::string& oid_str)
{
Attribute attr(OIDS::lookup(oid_str), attr_bits.get_contents());
DER::encode(tbs_req, attr);
}
/*************************************************
* Encode an Extension for a PKCS #10 request *
*************************************************/
void do_ext(DER_Encoder& attr_encoder, DER_Encoder& extn_bits,
const std::string& oid)
{
Extension extn(oid, extn_bits.get_contents());
DER::encode(attr_encoder, extn);
}
/*************************************************
* Encode X.509 extensions for a PKCS #10 request *
*************************************************/
void encode_extensions(DER_Encoder& attr_encoder,
const AlternativeName& subject_alt,
bool is_CA, u32bit path_limit,
Key_Constraints constraints,
const std::vector<OID>& ex_constraints)
{
DER_Encoder v3_ext;
attr_encoder.start_sequence();
if(is_CA)
{
v3_ext.start_sequence();
DER::encode(v3_ext, true);
if(path_limit != NO_CERT_PATH_LIMIT)
DER::encode(v3_ext, path_limit);
v3_ext.end_sequence();
do_ext(attr_encoder, v3_ext, "X509v3.BasicConstraints");
}
if(subject_alt.has_items())
{
DER::encode(v3_ext, subject_alt);
do_ext(attr_encoder, v3_ext, "X509v3.SubjectAlternativeName");
}
if(constraints != NO_CONSTRAINTS)
{
DER::encode(v3_ext, constraints);
do_ext(attr_encoder, v3_ext, "X509v3.KeyUsage");
}
if(ex_constraints.size())
{
v3_ext.start_sequence();
for(u32bit j = 0; j != ex_constraints.size(); j++)
DER::encode(v3_ext, ex_constraints[j]);
v3_ext.end_sequence();
do_ext(attr_encoder, v3_ext, "X509v3.ExtendedKeyUsage");
}
attr_encoder.end_sequence();
}
}
namespace X509 {
/*************************************************
* Create a new self-signed X.509 certificate *
*************************************************/
X509_Certificate create_self_signed_cert(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
MemoryVector<byte> pub_key = shared_setup(opts, key);
std::auto_ptr<PK_Signer> signer(choose_sig_format(key, sig_algo));
load_info(opts, subject_dn, subject_alt);
Key_Constraints constraints;
if(opts.is_CA)
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
else
constraints = find_constraints(key, opts.constraints);
return X509_CA::make_cert(signer.get(), sig_algo, pub_key,
MemoryVector<byte>(), opts.start, opts.end,
subject_dn, subject_dn,
opts.is_CA, opts.path_limit,
subject_alt, constraints, opts.ex_constraints);
}
/*************************************************
* Create a PKCS #10 certificate request *
*************************************************/
PKCS10_Request create_cert_req(const X509_Cert_Options& opts,
const PKCS8_PrivateKey& key)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
MemoryVector<byte> pub_key = shared_setup(opts, key);
std::auto_ptr<PK_Signer> signer(choose_sig_format(key, sig_algo));
load_info(opts, subject_dn, subject_alt);
const u32bit PKCS10_VERSION = 0;
DER_Encoder tbs_req;
tbs_req.start_sequence();
DER::encode(tbs_req, PKCS10_VERSION);
DER::encode(tbs_req, subject_dn);
tbs_req.add_raw_octets(pub_key);
tbs_req.start_explicit(ASN1_Tag(0));
DER_Encoder attr_encoder;
if(opts.challenge != "")
{
ASN1_String challenge(opts.challenge, DIRECTORY_STRING);
DER::encode(attr_encoder, challenge);
do_attribute(tbs_req, attr_encoder, "PKCS9.ChallengePassword");
}
Key_Constraints constraints;
if(opts.is_CA)
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
else
constraints = find_constraints(key, opts.constraints);
encode_extensions(attr_encoder, subject_alt, opts.is_CA, opts.path_limit,
constraints, opts.ex_constraints);
do_attribute(tbs_req, attr_encoder, "PKCS9.ExtensionRequest");
tbs_req.end_explicit(ASN1_Tag(0));
tbs_req.end_sequence();
MemoryVector<byte> tbs_bits = tbs_req.get_contents();
MemoryVector<byte> sig = signer->sign_message(tbs_bits);
DER_Encoder full_req;
full_req.start_sequence();
full_req.add_raw_octets(tbs_bits);
DER::encode(full_req, sig_algo);
DER::encode(full_req, sig, BIT_STRING);
full_req.end_sequence();
DataSource_Memory source(full_req.get_contents());
return PKCS10_Request(source);
}
}
}
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