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/*
* sign.c - Sign PSKC data with X.509 key/cert.
* Copyright (C) 2012-2015 Simon Josefsson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <config.h>
#include <pskc/pskc.h>
#define INTERNAL_NEED_PSKC_STRUCT
#include "internal.h"
#include <xmlsec/xmlsec.h>
#include <xmlsec/crypto.h>
#include <xmlsec/xmltree.h>
#include <xmlsec/xmldsig.h>
#include <xmlsec/templates.h>
/**
* pskc_sign_x509:
* @container: a #pskc_t handle, from pskc_init().
* @key_file: filename of file containing private key.
* @cert_file: filename of file containing corresponding X.509 certificate.
*
* Sign PSKC data using X.509 certificate and private key.
*
* Returns: On success, %PSKC_OK (zero) is returned, or an error code.
*/
int
pskc_sign_x509 (pskc_t * container,
const char *key_file, const char *cert_file)
{
xmlNodePtr signNode;
xmlNodePtr keyInfoNode = NULL;
xmlNodePtr refNode = NULL;
xmlSecDSigCtxPtr dsigCtx = NULL;
pskc_build_xml (container, NULL, NULL);
/* create signature template for RSA-SHA1 enveloped signature */
signNode = xmlSecTmplSignatureCreate (container->xmldoc,
xmlSecTransformExclC14NId,
xmlSecTransformRsaSha1Id, NULL);
if (signNode == NULL)
{
_pskc_debug ("xmlSecTmplSignatureCreateNsPref failed");
return PSKC_XMLSEC_ERROR;
}
/* add <dsig:Signature/> node to the doc */
xmlAddChild (xmlDocGetRootElement (container->xmldoc), signNode);
/* add reference */
refNode = xmlSecTmplSignatureAddReference (signNode, xmlSecTransformSha1Id,
NULL, NULL, NULL);
if (refNode == NULL)
{
_pskc_debug ("xmlSecTmplSignatureAddReference failed");
return PSKC_XMLSEC_ERROR;
}
/* add enveloped transform */
if (xmlSecTmplReferenceAddTransform (refNode,
xmlSecTransformEnvelopedId) == NULL)
{
_pskc_debug ("xmlSecTmplReferenceAddTransform failed");
return PSKC_XMLSEC_ERROR;
}
/* add <dsig:KeyInfo/> and <dsig:X509Data/> */
keyInfoNode = xmlSecTmplSignatureEnsureKeyInfo (signNode, NULL);
if (keyInfoNode == NULL)
{
_pskc_debug ("xmlSecTmplSignatureEnsureKeyInfo failed");
return PSKC_XMLSEC_ERROR;
}
if (xmlSecTmplKeyInfoAddX509Data (keyInfoNode) == NULL)
{
_pskc_debug ("xmlSecTmplKeyInfoAddX509Data failed");
return PSKC_XMLSEC_ERROR;
}
/* create signature context, we don't need keys manager in this example */
dsigCtx = xmlSecDSigCtxCreate (NULL);
if (dsigCtx == NULL)
{
_pskc_debug ("xmlSecDSigCtxCreate failed");
return PSKC_XMLSEC_ERROR;
}
/* load private key, assuming that there is not password */
dsigCtx->signKey = xmlSecCryptoAppKeyLoad (key_file,
xmlSecKeyDataFormatPem,
NULL, NULL, NULL);
if (dsigCtx->signKey == NULL)
{
_pskc_debug ("xmlSecCryptoAppKeyLoad failed");
return PSKC_XMLSEC_ERROR;
}
/* load certificate and add to the key */
if (xmlSecCryptoAppKeyCertLoad
(dsigCtx->signKey, cert_file, xmlSecKeyDataFormatCertPem) < 0)
{
_pskc_debug ("xmlSecCryptoAppKeyCertLoad failed");
return PSKC_XMLSEC_ERROR;
}
/* set key name to the file name, this is just an example! */
if (xmlSecKeySetName (dsigCtx->signKey, BAD_CAST key_file) < 0)
{
_pskc_debug ("xmlSecKeySetName failed");
return PSKC_XMLSEC_ERROR;
}
/* sign the template */
if (xmlSecDSigCtxSign (dsigCtx, signNode) < 0)
{
_pskc_debug ("xmlSecDSigCtxSign failed");
return PSKC_XMLSEC_ERROR;
}
return PSKC_OK;
}
static int
verify (pskc_t * container, xmlSecKeysMngrPtr mngr,
xmlSecDSigCtxPtr dsigCtx, const char *cert_file, int *valid_signature)
{
xmlNodePtr node = NULL;
node = xmlSecFindNode (xmlDocGetRootElement (container->xmldoc),
xmlSecNodeSignature, xmlSecDSigNs);
if (node == NULL)
{
_pskc_debug ("xmlSecFindNode failed");
return PSKC_XMLSEC_ERROR;
}
if (xmlSecCryptoAppDefaultKeysMngrInit (mngr) < 0)
{
_pskc_debug ("xmlSecCryptoAppDefaultKeysMngrInit failed");
return PSKC_XMLSEC_ERROR;
}
if (xmlSecCryptoAppKeysMngrCertLoad (mngr, cert_file,
xmlSecKeyDataFormatPem,
xmlSecKeyDataTypeTrusted) < 0)
{
_pskc_debug ("xmlSecCryptoAppKeysMngrCertLoad failed");
return PSKC_XMLSEC_ERROR;
}
if (xmlSecDSigCtxVerify (dsigCtx, node) < 0)
{
_pskc_debug ("xmlSecDSigCtxVerify failed");
return PSKC_XMLSEC_ERROR;
}
if (dsigCtx->status == xmlSecDSigStatusSucceeded)
*valid_signature = 1;
else
*valid_signature = 0;
return PSKC_OK;
}
/**
* pskc_verify_x509crt:
* @container: a #pskc_t handle, from pskc_init().
* @cert_file: filename of file containing trusted X.509 certificate.
* @valid_signature: output variable with result of verification.
*
* Verify signature in PSKC data against trusted X.509 certificate.
*
* Returns: On success, %PSKC_OK (zero) is returned, or an error code.
*/
int
pskc_verify_x509crt (pskc_t * container, const char *cert_file,
int *valid_signature)
{
xmlSecKeysMngrPtr mngr = NULL;
xmlSecDSigCtxPtr dsigCtx = NULL;
int rc;
mngr = xmlSecKeysMngrCreate ();
if (mngr == NULL)
{
_pskc_debug ("xmlSecKeysMngrCreate failed");
return PSKC_XMLSEC_ERROR;
}
dsigCtx = xmlSecDSigCtxCreate (mngr);
if (dsigCtx == NULL)
{
_pskc_debug ("xmlSecDSigCtxCreate failed");
xmlSecKeysMngrDestroy (mngr);
return PSKC_XMLSEC_ERROR;
}
rc = verify (container, mngr, dsigCtx, cert_file, valid_signature);
xmlSecDSigCtxDestroy (dsigCtx);
xmlSecKeysMngrDestroy (mngr);
return rc;
}
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