Choose the verify parts methods using the WSSVerifyPart API
We can configure the signing verification information for the consumer binding using the WSS API. The transform algorithm and digest methods are used for the consumer binding. Use the WSSVerifyPart API to configure the algorithm methods. The WSSVerifyPart API is provided in the com.ibm.websphere.wssecurity.wssapi.verification package.
To configure consumer verify parts information to protect message integrity, first digitally sign and then verify the signature and signed parts for the SOAP messages. Integrity refers to digital signature while confidentiality refers to encryption. Integrity decreases the risk of data modification when you transmit data across a network.
Methods
Methods used for the signing information include the:
- Digest method
- Sets the digest method.
- Transform method
- Sets the transform algorithm method.
Digest algorithms
The digest method algorithm is specified within the element is used in the <Digest> element. WebSphere Application Server supports the following pre-configured digest algorithms:
Digest method Description WSSVerifyPart.SHA1 (the default value) A URI of the digest algorithm, SHA1: http://www.w3.org/2000/09/xmldsig#sha1 WSSVerifyPart.SHA256 A URI of the digest algorithm, SHA256: http://www.w3.org/2001/04/xmlenc#sha256 WSSVerifyPart.SHA512 A URI of the digest algorithm, SHA256: http://www.w3.org/2001/04/xmlenc#sha512
Transform algorithms
The transform algorithm is specified within the <Transform> element and specifies the transform algorithm for the signed part. WebSphere Application Server supports the following pre-configured transform algorithms:
Digest method Description WSSVerifyPart.TRANSFORM_ENVELOPED_SIGNATURE A URI of the transform algorithm, enveloped signature: http://www.w3.org/2000/09/xmldsig#enveloped-signature WSSVerifyPart.TRANSFORM_STRT10 A URI of the transform algorithm, STR-Transform: http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#STR-Transform WSSVerifyPart.TRANSFORM_EXC_C14N (the default value) A URI of the transform algorithm, Exc-C14N: http://www.w3.org/2001/10/xml-exc-c14n# WSSVerifyPart.TRANSFORM_XPATH2_FILTER A URI of the transform algorithm, XPath2 filter: http://www.w3.org/2002/06/xmldsig-filter2 For the WSS APIs, WAS does not support the following transform algorithms:
- http://www.w3.org/TR/1999/REC-xpath-19991116
- http://www.w3.org/2002/07/decrypt#XML
The following example provides sample WSS API code that verifies the body using SHA256 as the digest method and TRANSFORM_EXC_14N and TRANSFORM_STRT10 as the transform methods:
// get the message context Object msgcontext = getMessageContext(); // generate WSSFactory instance WSSFactory factory = WSSFactory.getInstance(); // generate WSSConsumingContext instance WSSConsumingContext concont = factory.newWSSConsumingContext(); // generate the cert list String certpath = "intca2.cer";// The location of the X509 certificate file X509Certificate x509cert = null; try { InputStream is = new FileInputStream(certpath); CertificateFactory cf = CertificateFactory.getInstance("X.509"); x509cert = (X509Certificate)cf.generateCertificate(is); } catch(FileNotFoundException e1){ throw new WSSException(e1); } catch (CertificateException e2) { throw new WSSException(e2); } Set<Object> eeCerts = new HashSet<Object>(); eeCerts.add(x509cert); // create certStore java.util.List<CertStore> certList = new java.util.ArrayList<CertStore>(); CollectionCertStoreParameters certparam = new CollectionCertStoreParameters(eeCerts); CertStore cert = null; try { cert = CertStore.getInstance("Collection", certparam, "IBMCertPath"); } catch (NoSuchProviderException e1) { throw new WSSException(e1); } catch (InvalidAlgorithmParameterException e2) { throw new WSSException(e2); } catch (NoSuchAlgorithmException e3) { throw new WSSException (e3); } if(certList != null ){ certList.add(cert); } // generate callback handler X509ConsumeCallbackHandler callbackHandler = new X509ConsumeCallbackHandler( "dsig-receiver.ks", "jks", "server".toCharArray(), certList, java.security.Security.getProvider("IBMCertPath") ); //generate WSSVerification instance WSSVerification ver = factory.newWSSVerification(X509Token.class, callbackHandler); //set one or more candidates of the signature method used for the //verification (step. 1) // DEFAULT : WSSVerification.RSA_SHA1 ver.addAllowedSignatureMethod(WSSVerification.HMAC_SHA1); //set one or more candidates of the canonicalization method used //for the verification (step. 2) // DEFAULT : WSSVerification.EXC_C14N ver.addAllowedCanonicalizationMethod(WSSVerification.C14N); ver.addAllowedCanonicalizationMethod(WSSVerification.EXC_C14N); //set the part to be specified by WSSVerifyPart WSSVerifyPart verPart = factory.newWSSVerifyPart(); //set the part to be specified by the keyword verPart.setRequiredVerifyPart(WSSVerification.BODY); //set the candidates of digest methods to use for verification (step. 3) // DEFAULT : WSSVerifypart.TRANSFORM_EXC_C14N verPart.addAllowedTransform(WSSVerifyPart.TRANSFORM_EXC_C14N); verPart.addAllowedTransform(WSSVerifyPart.TRANSFORM_STRT10); //set the candidates of digest methods to use for verification (step. 4) // DEFAULT : WSSVerifyPart.SHA1 verPart.addAllowedDigestMethod(WSSVerifyPart.SHA256); //set WSSVerifyPart to WSSVerification ver.addRequiredVerifyPart(verPart); //add the WSSVerification to the WSSConsumingContext concont.add(ver); //validate the WS-Security header concont.process(msgcontext);
Related
Signature verification methods using the WSSVerification API Digital signing methods using the WSSSignature API Signed parts methods using the WSSSignPart API