/*
- Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2015 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
#include "certificate_chain.h"
#include "exceptions.h"
#include "util.h"
+#include "dcp_assert.h"
#include "KM_util.h"
+#include "compose.hpp"
+#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/sha.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
+#include <openssl/pem.h>
#include <boost/filesystem.hpp>
#include <boost/algorithm/string.hpp>
+#include <boost/foreach.hpp>
#include <fstream>
#include <sstream>
using std::ofstream;
using std::ifstream;
using std::stringstream;
+using namespace dcp;
/** Run a shell command.
* @param cmd Command to run (UTF8-encoded).
}
/* Decode the base64 of the public key */
-
+
unsigned char buffer[512];
int const N = dcp::base64_decode (pub, buffer, 1024);
string dig = Kumu::base64encode (digest, SHA_DIGEST_LENGTH, digest_base64, 64);
#ifdef LIBDCP_WINDOWS
boost::replace_all (dig, "/", "\\/");
-#else
+#else
boost::replace_all (dig, "/", "\\\\/");
-#endif
+#endif
return dig;
}
-boost::filesystem::path
-dcp::make_certificate_chain (
+CertificateChain::CertificateChain (
boost::filesystem::path openssl,
string organisation,
string organisational_unit,
{
boost::filesystem::path directory = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path ();
boost::filesystem::create_directories (directory);
-
+
boost::filesystem::path const cwd = boost::filesystem::current_path ();
boost::filesystem::current_path (directory);
<< "OU = Organization unit\n"
<< "CN = Entity and dnQualifier\n";
}
-
+
string const inter_subject = "/O=" + organisation +
"/OU=" + organisational_unit +
"/CN=" + intermediate_common_name +
command (s.str().c_str());
}
-
+
command (
quoted_openssl +
" x509 -req -sha256 -days 3649 -CA ca.self-signed.pem -CAkey ca.key -set_serial 6"
boost::filesystem::current_path (cwd);
- return directory;
+ _certificates.push_back (dcp::Certificate (dcp::file_to_string (directory / "ca.self-signed.pem")));
+ _certificates.push_back (dcp::Certificate (dcp::file_to_string (directory / "intermediate.signed.pem")));
+ _certificates.push_back (dcp::Certificate (dcp::file_to_string (directory / "leaf.signed.pem")));
+
+ _key = dcp::file_to_string (directory / "leaf.key");
+
+ boost::filesystem::remove_all (directory);
+}
+
+/** @return Root certificate */
+Certificate
+CertificateChain::root () const
+{
+ DCP_ASSERT (!_certificates.empty());
+ return _certificates.front ();
+}
+
+/** @return Leaf certificate */
+Certificate
+CertificateChain::leaf () const
+{
+ DCP_ASSERT (_certificates.size() >= 2);
+ return _certificates.back ();
+}
+
+/** @return Certificates in order from root to leaf */
+CertificateChain::List
+CertificateChain::root_to_leaf () const
+{
+ return _certificates;
+}
+
+/** @return Certificates in order from leaf to root */
+CertificateChain::List
+CertificateChain::leaf_to_root () const
+{
+ List c = _certificates;
+ c.reverse ();
+ return c;
+}
+
+/** Add a certificate to the end of the chain.
+ * @param c Certificate to add.
+ */
+void
+CertificateChain::add (Certificate c)
+{
+ _certificates.push_back (c);
+}
+
+/** Remove a certificate from the chain.
+ * @param c Certificate to remove.
+ */
+void
+CertificateChain::remove (Certificate c)
+{
+ _certificates.remove (c);
+}
+
+/** Remove the i'th certificate in the list, as listed
+ * from root to leaf.
+ */
+void
+CertificateChain::remove (int i)
+{
+ List::iterator j = _certificates.begin ();
+ while (j != _certificates.end () && i > 0) {
+ --i;
+ ++j;
+ }
+
+ if (j != _certificates.end ()) {
+ _certificates.erase (j);
+ }
+}
+
+/** Check to see if the chain is valid (i.e. root signs the intermediate, intermediate
+ * signs the leaf and so on) and that the private key (if there is one) matches the
+ * leaf certificate.
+ * @return true if it's ok, false if not.
+ */
+bool
+CertificateChain::valid () const
+{
+ /* Check the certificate chain */
+
+ X509_STORE* store = X509_STORE_new ();
+ if (!store) {
+ return false;
+ }
+
+ for (List::const_iterator i = _certificates.begin(); i != _certificates.end(); ++i) {
+
+ List::const_iterator j = i;
+ ++j;
+ if (j == _certificates.end ()) {
+ break;
+ }
+
+ if (!X509_STORE_add_cert (store, i->x509 ())) {
+ X509_STORE_free (store);
+ return false;
+ }
+
+ X509_STORE_CTX* ctx = X509_STORE_CTX_new ();
+ if (!ctx) {
+ X509_STORE_free (store);
+ return false;
+ }
+
+ X509_STORE_set_flags (store, 0);
+ if (!X509_STORE_CTX_init (ctx, store, j->x509 (), 0)) {
+ X509_STORE_CTX_free (ctx);
+ X509_STORE_free (store);
+ return false;
+ }
+
+ int v = X509_verify_cert (ctx);
+ X509_STORE_CTX_free (ctx);
+
+ if (v == 0) {
+ X509_STORE_free (store);
+ return false;
+ }
+ }
+
+ X509_STORE_free (store);
+
+ /* Check that the leaf certificate matches the private key, if there is one */
+
+ if (!_key) {
+ return true;
+ }
+
+ 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 = leaf().public_key ();
+ bool const valid = !BN_cmp (private_key->n, public_key->n);
+ BIO_free (bio);
+
+ return valid;
+}
+
+/** @return true if the chain is now in order from root to leaf,
+ * false if no correct order was found.
+ */
+bool
+CertificateChain::attempt_reorder ()
+{
+ List original = _certificates;
+ _certificates.sort ();
+ do {
+ if (valid ()) {
+ return true;
+ }
+ } while (std::next_permutation (_certificates.begin(), _certificates.end ()));
+
+ _certificates = original;
+ return false;
+}
+
+/** Add a <Signer> and <ds:Signature> nodes to an XML node.
+ * @param parent XML node to add to.
+ * @param standard INTEROP or SMPTE.
+ */
+void
+CertificateChain::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 (leaf().issuer());
+ serial_element->add_child("X509SerialNumber", "dsig")->add_child_text (leaf().serial());
+ data->add_child("X509SubjectName", "dsig")->add_child_text (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
+CertificateChain::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 = leaf_to_root ();
+ BOOST_FOREACH (Certificate const & i, leaf_to_root ()) {
+ 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 StringError ("could not read private key");
+ }
+
+ /* XXX: set key name to the PEM string: this can't be 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);
}
projects / libdcp.git / blobdiff