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/*
Copyright (C) 2012 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.
*/
#include <sstream>
#include <vector>
#include <boost/algorithm/string.hpp>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/asn1.h>
#include <libxml++/nodes/element.h>
#include "KM_util.h"
#include "certificates.h"
#include "compose.hpp"
#include "exceptions.h"
using std::list;
using std::string;
using std::stringstream;
using std::vector;
using boost::shared_ptr;
using namespace libdcp;
/** @param c X509 certificate, which this object will take ownership of */
Certificate::Certificate (X509* c)
: _certificate (c)
{
}
Certificate::Certificate (string const & filename)
: _certificate (0)
{
FILE* f = fopen (filename.c_str(), "r");
if (!f) {
throw FileError ("could not open file", filename);
}
if (!PEM_read_X509 (f, &_certificate, 0, 0)) {
throw MiscError ("could not read X509 certificate");
}
}
Certificate::~Certificate ()
{
X509_free (_certificate);
}
string
Certificate::certificate () const
{
assert (_certificate);
BIO* bio = BIO_new (BIO_s_mem ());
if (!bio) {
throw MiscError ("could not create memory BIO");
}
PEM_write_bio_X509 (bio, _certificate);
string s;
char* data;
long int const data_length = BIO_get_mem_data (bio, &data);
for (long int i = 0; i < data_length; ++i) {
s += data[i];
}
BIO_free (bio);
boost::replace_all (s, "-----BEGIN CERTIFICATE-----\n", "");
boost::replace_all (s, "\n-----END CERTIFICATE-----\n", "");
return s;
}
string
Certificate::issuer () const
{
assert (_certificate);
return name_for_xml (X509_get_issuer_name (_certificate));
}
string
Certificate::asn_to_utf8 (ASN1_STRING* s)
{
unsigned char* buf = new unsigned char[256];
ASN1_STRING_to_UTF8 (&buf, s);
string const u (reinterpret_cast<char *> (buf));
delete[] buf;
return u;
}
string
Certificate::get_name_part (X509_NAME* n, int nid)
{
int p = -1;
p = X509_NAME_get_index_by_NID (n, nid, p);
assert (p != -1);
return asn_to_utf8 (X509_NAME_ENTRY_get_data (X509_NAME_get_entry (n, p)));
}
string
Certificate::name_for_xml (X509_NAME * n)
{
assert (n);
string s = String::compose (
"dnQualifier=%1,CN=%2,OU=%3,O=%4",
get_name_part (n, NID_dnQualifier),
get_name_part (n, NID_commonName),
get_name_part (n, NID_organizationalUnitName),
get_name_part (n, NID_organizationName)
);
boost::replace_all (s, "+", "\\+");
return s;
}
string
Certificate::subject () const
{
assert (_certificate);
return name_for_xml (X509_get_subject_name (_certificate));
}
string
Certificate::serial () const
{
assert (_certificate);
ASN1_INTEGER* s = X509_get_serialNumber (_certificate);
assert (s);
BIGNUM* b = ASN1_INTEGER_to_BN (s, 0);
char* c = BN_bn2dec (b);
BN_free (b);
string st (c);
OPENSSL_free (c);
return st;
}
string
Certificate::thumbprint () const
{
assert (_certificate);
uint8_t buffer[8192];
uint8_t* p = buffer;
i2d_X509_CINF (_certificate->cert_info, &p);
int const length = p - buffer;
if (length > 8192) {
throw MiscError ("buffer too small to generate thumbprint");
}
SHA_CTX sha;
SHA1_Init (&sha);
SHA1_Update (&sha, buffer, length);
uint8_t digest[20];
SHA1_Final (digest, &sha);
char digest_base64[64];
return Kumu::base64encode (digest, 20, digest_base64, 64);
}
shared_ptr<Certificate>
CertificateChain::root () const
{
assert (!_certificates.empty());
return _certificates.front ();
}
shared_ptr<Certificate>
CertificateChain::leaf () const
{
assert (_certificates.size() >= 2);
return _certificates.back ();
}
list<shared_ptr<Certificate> >
CertificateChain::leaf_to_root () const
{
list<shared_ptr<Certificate> > c = _certificates;
c.reverse ();
return c;
}
void
CertificateChain::add (shared_ptr<Certificate> c)
{
_certificates.push_back (c);
}
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