Esempio n. 1
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        /**
         * Find the issuer certificates of a given certificate.
         *
         * @param cert
         *            The certificate for which an issuer should be found.
         * @param pkixParams
         * @return A <code>Collection</code> object containing the issuer
         *         <code>X509Certificate</code>s. Never <code>null</code>.
         *
         * @exception Exception
         *                if an error occurs.
         */
        internal static ICollection FindIssuerCerts(
            X509Certificate cert,
            PkixBuilderParameters pkixParams)
        {
            X509CertStoreSelector certSelect = new X509CertStoreSelector();
            ISet certs = new HashSet();

            try
            {
                certSelect.Subject = cert.IssuerDN;
            }
            catch (IOException ex)
            {
                throw new Exception(
                          "Subject criteria for certificate selector to find issuer certificate could not be set.", ex);
            }

            try
            {
                certs.AddAll(PkixCertPathValidatorUtilities.FindCertificates(certSelect, pkixParams.GetStores()));
                certs.AddAll(PkixCertPathValidatorUtilities.FindCertificates(certSelect, pkixParams.GetAdditionalStores()));
            }
            catch (Exception e)
            {
                throw new Exception("Issuer certificate cannot be searched.", e);
            }

            return(certs);
        }
Esempio n. 2
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        /**
         * Build and validate a CertPath using the given parameter.
         *
         * @param params PKIXBuilderParameters object containing all information to
         *            build the CertPath
         */
        public virtual PkixCertPathBuilderResult Build(
            PkixBuilderParameters pkixParams)
        {
            // search target certificates

            IX509Selector certSelect = pkixParams.GetTargetCertConstraints();

            if (!(certSelect is X509CertStoreSelector))
            {
                throw new PkixCertPathBuilderException(
                          "TargetConstraints must be an instance of "
                          + typeof(X509CertStoreSelector).FullName + " for "
                          + this.GetType() + " class.");
            }

            ISet targets = new HashSet();

            try
            {
                targets.AddAll(PkixCertPathValidatorUtilities.FindCertificates((X509CertStoreSelector)certSelect, pkixParams.GetStores()));
                // TODO Should this include an entry for pkixParams.GetAdditionalStores() too?
            }
            catch (Exception e)
            {
                throw new PkixCertPathBuilderException(
                          "Error finding target certificate.", e);
            }

            if (targets.IsEmpty)
            {
                throw new PkixCertPathBuilderException("No certificate found matching targetContraints.");
            }

            PkixCertPathBuilderResult result = null;
            IList certPathList = Platform.CreateArrayList();

            // check all potential target certificates
            foreach (X509Certificate cert in targets)
            {
                result = Build(cert, pkixParams, certPathList);

                if (result != null)
                {
                    break;
                }
            }

            if (result == null && certPathException != null)
            {
                throw new PkixCertPathBuilderException(certPathException.Message, certPathException.InnerException);
            }

            if (result == null && certPathException == null)
            {
                throw new PkixCertPathBuilderException("Unable to find certificate chain.");
            }

            return(result);
        }
Esempio n. 3
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        /**
         * Makes a copy of this <code>PKIXParameters</code> object. Changes to the
         * copy will not affect the original and vice versa.
         *
         * @return a copy of this <code>PKIXParameters</code> object
         */
        public override object Clone()
        {
            PkixBuilderParameters parameters = new PkixBuilderParameters(
                GetTrustAnchors(), GetTargetCertConstraints());

            parameters.SetParams(this);
            return(parameters);
        }
Esempio n. 4
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        /**
         * Returns an instance of <code>PkixBuilderParameters</code>.
         * <p>
         * This method can be used to get a copy from other
         * <code>PKIXBuilderParameters</code>, <code>PKIXParameters</code>,
         * and <code>ExtendedPKIXParameters</code> instances.
         * </p>
         *
         * @param pkixParams The PKIX parameters to create a copy of.
         * @return An <code>PkixBuilderParameters</code> instance.
         */
        public static PkixBuilderParameters GetInstance(
            PkixParameters pkixParams)
        {
            PkixBuilderParameters parameters = new PkixBuilderParameters(
                pkixParams.GetTrustAnchors(),
                new X509CertStoreSelector(pkixParams.GetTargetCertConstraints()));

            parameters.SetParams(pkixParams);
            return(parameters);
        }
Esempio n. 5
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 /**
  * Can alse handle <code>ExtendedPKIXBuilderParameters</code> and
  * <code>PKIXBuilderParameters</code>.
  *
  * @param params Parameters to set.
  * @see Al.Security.x509.ExtendedPKIXParameters#setParams(java.security.cert.PKIXParameters)
  */
 protected override void SetParams(
     PkixParameters parameters)
 {
     base.SetParams(parameters);
     if (parameters is PkixBuilderParameters)
     {
         PkixBuilderParameters _params = (PkixBuilderParameters)parameters;
         maxPathLength = _params.maxPathLength;
         excludedCerts = new HashSet(_params.excludedCerts);
     }
 }
        /**
         * Searches for a holder public key certificate and verifies its
         * certification path.
         *
         * @param attrCert the attribute certificate.
         * @param pkixParams The PKIX parameters.
         * @return The certificate path of the holder certificate.
         * @throws Exception if
         *             <ul>
         *             <li>no public key certificate can be found although holder
         *             information is given by an entity name or a base certificate
         *             ID</li>
         *             <li>support classes cannot be created</li>
         *             <li>no certification path for the public key certificate can
         *             be built</li>
         *             </ul>
         */
        internal static PkixCertPath ProcessAttrCert1(
            IX509AttributeCertificate attrCert,
            PkixParameters pkixParams)
        {
            PkixCertPathBuilderResult result = null;
            // find holder PKCs
            ISet holderPKCs = new HashSet();

            if (attrCert.Holder.GetIssuer() != null)
            {
                X509CertStoreSelector selector = new X509CertStoreSelector();
                selector.SerialNumber = attrCert.Holder.SerialNumber;
                X509Name[] principals = attrCert.Holder.GetIssuer();
                for (int i = 0; i < principals.Length; i++)
                {
                    try
                    {
//						if (principals[i] is X500Principal)
                        {
                            selector.Issuer = principals[i];
                        }
                        holderPKCs.AddAll(PkixCertPathValidatorUtilities
                                          .FindCertificates(selector, pkixParams.GetStores()));
                    }
                    catch (Exception e)
                    {
                        throw new PkixCertPathValidatorException(
                                  "Public key certificate for attribute certificate cannot be searched.",
                                  e);
                    }
                }
                if (holderPKCs.IsEmpty)
                {
                    throw new PkixCertPathValidatorException(
                              "Public key certificate specified in base certificate ID for attribute certificate cannot be found.");
                }
            }
            if (attrCert.Holder.GetEntityNames() != null)
            {
                X509CertStoreSelector selector   = new X509CertStoreSelector();
                X509Name[]            principals = attrCert.Holder.GetEntityNames();
                for (int i = 0; i < principals.Length; i++)
                {
                    try
                    {
//						if (principals[i] is X500Principal)
                        {
                            selector.Issuer = principals[i];
                        }
                        holderPKCs.AddAll(PkixCertPathValidatorUtilities
                                          .FindCertificates(selector, pkixParams.GetStores()));
                    }
                    catch (Exception e)
                    {
                        throw new PkixCertPathValidatorException(
                                  "Public key certificate for attribute certificate cannot be searched.",
                                  e);
                    }
                }
                if (holderPKCs.IsEmpty)
                {
                    throw new PkixCertPathValidatorException(
                              "Public key certificate specified in entity name for attribute certificate cannot be found.");
                }
            }

            // verify cert paths for PKCs
            PkixBuilderParameters parameters = (PkixBuilderParameters)
                                               PkixBuilderParameters.GetInstance(pkixParams);

            PkixCertPathValidatorException lastException = null;

            foreach (X509Certificate cert in holderPKCs)
            {
                X509CertStoreSelector selector = new X509CertStoreSelector();
                selector.Certificate = cert;
                parameters.SetTargetConstraints(selector);

                PkixCertPathBuilder builder = new PkixCertPathBuilder();

                try
                {
                    result = builder.Build(PkixBuilderParameters.GetInstance(parameters));
                }
                catch (PkixCertPathBuilderException e)
                {
                    lastException = new PkixCertPathValidatorException(
                        "Certification path for public key certificate of attribute certificate could not be build.",
                        e);
                }
            }
            if (lastException != null)
            {
                throw lastException;
            }
            return(result.CertPath);
        }
Esempio n. 7
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        protected virtual PkixCertPathBuilderResult Build(
            X509Certificate tbvCert,
            PkixBuilderParameters pkixParams,
            IList tbvPath)
        {
            // If tbvCert is readily present in tbvPath, it indicates having run
            // into a cycle in the PKI graph.
            if (tbvPath.Contains(tbvCert))
            {
                return(null);
            }

            // step out, the certificate is not allowed to appear in a certification
            // chain.
            if (pkixParams.GetExcludedCerts().Contains(tbvCert))
            {
                return(null);
            }

            // test if certificate path exceeds maximum length
            if (pkixParams.MaxPathLength != -1)
            {
                if (tbvPath.Count - 1 > pkixParams.MaxPathLength)
                {
                    return(null);
                }
            }

            tbvPath.Add(tbvCert);

//			X509CertificateParser certParser = new X509CertificateParser();
            PkixCertPathBuilderResult builderResult = null;
            PkixCertPathValidator     validator     = new PkixCertPathValidator();

            try
            {
                // check whether the issuer of <tbvCert> is a TrustAnchor
                if (PkixCertPathValidatorUtilities.FindTrustAnchor(tbvCert, pkixParams.GetTrustAnchors()) != null)
                {
                    // exception message from possibly later tried certification
                    // chains
                    PkixCertPath certPath = null;
                    try
                    {
                        certPath = new PkixCertPath(tbvPath);
                    }
                    catch (Exception e)
                    {
                        throw new Exception(
                                  "Certification path could not be constructed from certificate list.",
                                  e);
                    }

                    PkixCertPathValidatorResult result = null;
                    try
                    {
                        result = (PkixCertPathValidatorResult)validator.Validate(
                            certPath, pkixParams);
                    }
                    catch (Exception e)
                    {
                        throw new Exception(
                                  "Certification path could not be validated.", e);
                    }

                    return(new PkixCertPathBuilderResult(certPath, result.TrustAnchor,
                                                         result.PolicyTree, result.SubjectPublicKey));
                }
                else
                {
                    // add additional X.509 stores from locations in certificate
                    try
                    {
                        PkixCertPathValidatorUtilities.AddAdditionalStoresFromAltNames(
                            tbvCert, pkixParams);
                    }
                    catch (CertificateParsingException e)
                    {
                        throw new Exception(
                                  "No additiontal X.509 stores can be added from certificate locations.",
                                  e);
                    }

                    // try to get the issuer certificate from one of the stores
                    HashSet issuers = new HashSet();
                    try
                    {
                        issuers.AddAll(PkixCertPathValidatorUtilities.FindIssuerCerts(tbvCert, pkixParams));
                    }
                    catch (Exception e)
                    {
                        throw new Exception(
                                  "Cannot find issuer certificate for certificate in certification path.",
                                  e);
                    }

                    if (issuers.IsEmpty)
                    {
                        throw new Exception("No issuer certificate for certificate in certification path found.");
                    }

                    foreach (X509Certificate issuer in issuers)
                    {
                        builderResult = Build(issuer, pkixParams, tbvPath);

                        if (builderResult != null)
                        {
                            break;
                        }
                    }
                }
            }
            catch (Exception e)
            {
                certPathException = e;
            }

            if (builderResult == null)
            {
                tbvPath.Remove(tbvCert);
            }

            return(builderResult);
        }
        /**
         * Build and validate a CertPath using the given parameter.
         *
         * @param params PKIXBuilderParameters object containing all information to
         *            build the CertPath
         */
        public virtual PkixCertPathBuilderResult Build(
            PkixBuilderParameters pkixParams)
        {
            // search target certificates

            IX509Selector certSelect = pkixParams.GetTargetConstraints();

            if (!(certSelect is X509AttrCertStoreSelector))
            {
                throw new PkixCertPathBuilderException(
                          "TargetConstraints must be an instance of "
                          + typeof(X509AttrCertStoreSelector).FullName
                          + " for "
                          + typeof(PkixAttrCertPathBuilder).FullName + " class.");
            }

            ICollection targets;

            try
            {
                targets = PkixCertPathValidatorUtilities.FindCertificates(
                    (X509AttrCertStoreSelector)certSelect, pkixParams.GetStores());
            }
            catch (Exception e)
            {
                throw new PkixCertPathBuilderException("Error finding target attribute certificate.", e);
            }

            if (targets.Count == 0)
            {
                throw new PkixCertPathBuilderException(
                          "No attribute certificate found matching targetContraints.");
            }

            PkixCertPathBuilderResult result = null;

            // check all potential target certificates
            foreach (IX509AttributeCertificate cert in targets)
            {
                X509CertStoreSelector selector   = new X509CertStoreSelector();
                X509Name[]            principals = cert.Issuer.GetPrincipals();
                ISet issuers = new HashSet();
                for (int i = 0; i < principals.Length; i++)
                {
                    try
                    {
                        selector.Subject = principals[i];

                        issuers.AddAll(PkixCertPathValidatorUtilities.FindCertificates(selector, pkixParams.GetStores()));
                    }
                    catch (Exception e)
                    {
                        throw new PkixCertPathBuilderException(
                                  "Public key certificate for attribute certificate cannot be searched.",
                                  e);
                    }
                }

                if (issuers.IsEmpty)
                {
                    throw new PkixCertPathBuilderException("Public key certificate for attribute certificate cannot be found.");
                }

                IList certPathList = Platform.CreateArrayList();

                foreach (X509Certificate issuer in issuers)
                {
                    result = Build(cert, issuer, pkixParams, certPathList);

                    if (result != null)
                    {
                        break;
                    }
                }

                if (result != null)
                {
                    break;
                }
            }

            if (result == null && certPathException != null)
            {
                throw new PkixCertPathBuilderException(
                          "Possible certificate chain could not be validated.",
                          certPathException);
            }

            if (result == null && certPathException == null)
            {
                throw new PkixCertPathBuilderException(
                          "Unable to find certificate chain.");
            }

            return(result);
        }