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/*
Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file src/signer.cc
* @brief Signer class.
*/
#include "signer.h"
#include "exceptions.h"
#include "certificate_chain.h"
#include "util.h"
#include <libcxml/cxml.h>
#include <libxml++/libxml++.h>
#include <xmlsec/xmldsig.h>
#include <xmlsec/dl.h>
#include <xmlsec/app.h>
#include <xmlsec/crypto.h>
#include <openssl/pem.h>
#include "compose.hpp"
using std::string;
using std::list;
using boost::shared_ptr;
using namespace dcp;
Signer::Signer (boost::filesystem::path openssl)
{
create (make_certificate_chain (openssl));
}
Signer::Signer (boost::filesystem::path openssl,
string organisation,
string organisational_unit,
string root_common_name,
string intermediate_common_name,
string leaf_common_name
)
{
create (
make_certificate_chain (
openssl,
organisation,
organisational_unit,
root_common_name,
intermediate_common_name,
leaf_common_name
)
);
}
void
Signer::create (boost::filesystem::path directory)
{
_certificates.add (dcp::Certificate (dcp::file_to_string (directory / "ca.self-signed.pem")));
_certificates.add (dcp::Certificate (dcp::file_to_string (directory / "intermediate.signed.pem")));
_certificates.add (dcp::Certificate (dcp::file_to_string (directory / "leaf.signed.pem")));
_key = dcp::file_to_string (directory / "leaf.key");
boost::filesystem::remove_all (directory);
}
/** Add a <Signer> and <ds:Signature> nodes to an XML node.
* @param parent XML node to add to.
* @param standard INTEROP or SMPTE.
*/
void
Signer::sign (xmlpp::Element* parent, Standard standard) const
{
/* <Signer> */
xmlpp::Element* signer = parent->add_child("Signer");
xmlpp::Element* data = signer->add_child("X509Data", "dsig");
xmlpp::Element* serial_element = data->add_child("X509IssuerSerial", "dsig");
serial_element->add_child("X509IssuerName", "dsig")->add_child_text (_certificates.leaf().issuer());
serial_element->add_child("X509SerialNumber", "dsig")->add_child_text (_certificates.leaf().serial());
data->add_child("X509SubjectName", "dsig")->add_child_text (_certificates.leaf().subject());
/* <Signature> */
xmlpp::Element* signature = parent->add_child("Signature", "dsig");
xmlpp::Element* signed_info = signature->add_child ("SignedInfo", "dsig");
signed_info->add_child("CanonicalizationMethod", "dsig")->set_attribute ("Algorithm", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
if (standard == INTEROP) {
signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#rsa-sha1");
} else {
signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
}
xmlpp::Element* reference = signed_info->add_child("Reference", "dsig");
reference->set_attribute ("URI", "");
xmlpp::Element* transforms = reference->add_child("Transforms", "dsig");
transforms->add_child("Transform", "dsig")->set_attribute (
"Algorithm", "http://www.w3.org/2000/09/xmldsig#enveloped-signature"
);
reference->add_child("DigestMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
/* This will be filled in by the signing later */
reference->add_child("DigestValue", "dsig");
signature->add_child("SignatureValue", "dsig");
signature->add_child("KeyInfo", "dsig");
add_signature_value (signature, "dsig");
}
/** Sign an XML node.
*
* @param parent Node to sign.
* @param ns Namespace to use for the signature XML nodes.
*/
void
Signer::add_signature_value (xmlpp::Node* parent, string ns) const
{
cxml::Node cp (parent);
xmlpp::Node* key_info = cp.node_child("KeyInfo")->node ();
/* Add the certificate chain to the KeyInfo child node of parent */
CertificateChain::List c = _certificates.leaf_to_root ();
for (CertificateChain::List::iterator i = c.begin(); i != c.end(); ++i) {
xmlpp::Element* data = key_info->add_child("X509Data", ns);
{
xmlpp::Element* serial = data->add_child("X509IssuerSerial", ns);
serial->add_child("X509IssuerName", ns)->add_child_text (i->issuer ());
serial->add_child("X509SerialNumber", ns)->add_child_text (i->serial ());
}
data->add_child("X509Certificate", ns)->add_child_text (i->certificate());
}
xmlSecDSigCtxPtr signature_context = xmlSecDSigCtxCreate (0);
if (signature_context == 0) {
throw MiscError ("could not create signature context");
}
signature_context->signKey = xmlSecCryptoAppKeyLoadMemory (
reinterpret_cast<const unsigned char *> (_key.c_str()), _key.size(), xmlSecKeyDataFormatPem, 0, 0, 0
);
if (signature_context->signKey == 0) {
throw FileError ("could not load private key file", _key, 0);
}
/* XXX: set key name to the file name: is this right? */
if (xmlSecKeySetName (signature_context->signKey, reinterpret_cast<const xmlChar *> (_key.c_str())) < 0) {
throw MiscError ("could not set key name");
}
int const r = xmlSecDSigCtxSign (signature_context, parent->cobj ());
if (r < 0) {
throw MiscError (String::compose ("could not sign (%1)", r));
}
xmlSecDSigCtxDestroy (signature_context);
}
bool
Signer::valid () const
{
if (!_certificates.valid ()) {
return false;
}
BIO* bio = BIO_new_mem_buf (const_cast<char *> (_key.c_str ()), -1);
if (!bio) {
throw MiscError ("could not create memory BIO");
}
RSA* private_key = PEM_read_bio_RSAPrivateKey (bio, 0, 0, 0);
RSA* public_key = _certificates.leaf().public_key ();
bool const valid = !BN_cmp (private_key->n, public_key->n);
BIO_free (bio);
return valid;
}
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