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/*
* PKCS #10/Self Signed Cert Creation
* (C) 1999-2008,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/x509self.h>
#include <botan/x509_ext.h>
#include <botan/x509_ca.h>
#include <botan/der_enc.h>
#include <botan/pubkey.h>
#include <botan/oids.h>
#include <botan/hash.h>
namespace Botan {
namespace {
/*
* 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);
for(auto extra_ou : opts.more_org_units) {
subject_dn.add_attribute("X520.OrganizationalUnit", extra_ou);
}
subject_dn.add_attribute("X520.SerialNumber", opts.serial_number);
subject_alt = AlternativeName(opts.email, opts.uri, opts.dns, opts.ip);
subject_alt.add_othername(OIDS::lookup("PKIX.XMPPAddr"),
opts.xmpp, UTF8_STRING);
for(auto dns : opts.more_dns)
subject_alt.add_attribute("DNS", dns);
}
}
namespace X509 {
/*
* Create a new self-signed X.509 certificate
*/
X509_Certificate create_self_signed_cert(const X509_Cert_Options& opts,
const Private_Key& key,
const std::string& hash_fn,
RandomNumberGenerator& rng)
{
AlgorithmIdentifier sig_algo;
X509_DN subject_dn;
AlternativeName subject_alt;
// for now, only the padding option is used
std::map<std::string,std::string> sig_opts = { {"padding",opts.padding_scheme} };
const std::vector<uint8_t> pub_key = X509::BER_encode(key);
std::unique_ptr<PK_Signer> signer(choose_sig_format(key, sig_opts, rng, hash_fn, sig_algo));
BOTAN_ASSERT_NOMSG(sig_algo.get_oid().has_value());
load_info(opts, subject_dn, subject_alt);
Extensions extensions = opts.extensions;
Key_Constraints constraints;
if(opts.is_CA)
{
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
}
else
{
verify_cert_constraints_valid_for_key_type(key, opts.constraints);
constraints = opts.constraints;
}
extensions.add_new(
new Cert_Extension::Basic_Constraints(opts.is_CA, opts.path_limit),
true);
if(constraints != NO_CONSTRAINTS)
{
extensions.add_new(new Cert_Extension::Key_Usage(constraints), true);
}
std::unique_ptr<Cert_Extension::Subject_Key_ID> skid(new Cert_Extension::Subject_Key_ID(pub_key, hash_fn));
extensions.add_new(new Cert_Extension::Authority_Key_ID(skid->get_key_id()));
extensions.add_new(skid.release());
extensions.add_new(
new Cert_Extension::Subject_Alternative_Name(subject_alt));
extensions.add_new(
new Cert_Extension::Extended_Key_Usage(opts.ex_constraints));
return X509_CA::make_cert(signer.get(), rng, sig_algo, pub_key,
opts.start, opts.end,
subject_dn, subject_dn,
extensions);
}
/*
* Create a PKCS #10 certificate request
*/
PKCS10_Request create_cert_req(const X509_Cert_Options& opts,
const Private_Key& key,
const std::string& hash_fn,
RandomNumberGenerator& rng)
{
X509_DN subject_dn;
AlternativeName subject_alt;
load_info(opts, subject_dn, subject_alt);
Key_Constraints constraints;
if(opts.is_CA)
{
constraints = Key_Constraints(KEY_CERT_SIGN | CRL_SIGN);
}
else
{
verify_cert_constraints_valid_for_key_type(key, opts.constraints);
constraints = opts.constraints;
}
Extensions extensions = opts.extensions;
extensions.add_new(new Cert_Extension::Basic_Constraints(opts.is_CA, opts.path_limit));
if(constraints != NO_CONSTRAINTS)
{
extensions.add_new(new Cert_Extension::Key_Usage(constraints));
}
extensions.add_new(new Cert_Extension::Extended_Key_Usage(opts.ex_constraints));
extensions.add_new(new Cert_Extension::Subject_Alternative_Name(subject_alt));
return PKCS10_Request::create(key,
subject_dn,
extensions,
hash_fn,
rng,
opts.padding_scheme,
opts.challenge);
}
}
}
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