コード例 #1
0
        /**
         * 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);
        }
コード例 #2
0
        /**
         * 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);
        }
コード例 #3
0
        /**
         * Fetches complete CRLs according to RFC 3280.
         *
         * @param dp The distribution point for which the complete CRL
         * @param cert The <code>X509Certificate</code> or
         *            {@link Nequeo.Cryptography.Key.x509.X509AttributeCertificate} for
         *            which the CRL should be searched.
         * @param currentDate The date for which the delta CRLs must be valid.
         * @param paramsPKIX The extended PKIX parameters.
         * @return A <code>Set</code> of <code>X509CRL</code>s with complete
         *         CRLs.
         * @throws Exception if an exception occurs while picking the CRLs
         *             or no CRLs are found.
         */
        internal static ISet GetCompleteCrls(
            DistributionPoint dp,
            object cert,
            DateTime currentDate,
            PkixParameters paramsPKIX)
        {
            X509CrlStoreSelector crlselect = new X509CrlStoreSelector();

            try
            {
                ISet issuers = new HashSet();
                if (cert is X509V2AttributeCertificate)
                {
                    issuers.Add(((X509V2AttributeCertificate)cert)
                                .Issuer.GetPrincipals()[0]);
                }
                else
                {
                    issuers.Add(GetIssuerPrincipal(cert));
                }
                PkixCertPathValidatorUtilities.GetCrlIssuersFromDistributionPoint(dp, issuers, crlselect, paramsPKIX);
            }
            catch (Exception e)
            {
                new Exception("Could not get issuer information from distribution point.", e);
            }

            if (cert is X509Certificate)
            {
                crlselect.CertificateChecking = (X509Certificate)cert;
            }
            else if (cert is X509V2AttributeCertificate)
            {
                crlselect.AttrCertChecking = (IX509AttributeCertificate)cert;
            }

            crlselect.CompleteCrlEnabled = true;
            ISet crls = CrlUtilities.FindCrls(crlselect, paramsPKIX, currentDate);

            if (crls.IsEmpty)
            {
                if (cert is IX509AttributeCertificate)
                {
                    IX509AttributeCertificate aCert = (IX509AttributeCertificate)cert;

                    throw new Exception("No CRLs found for issuer \"" + aCert.Issuer.GetPrincipals()[0] + "\"");
                }
                else
                {
                    X509Certificate xCert = (X509Certificate)cert;

                    throw new Exception("No CRLs found for issuer \"" + xCert.IssuerDN + "\"");
                }
            }

            return(crls);
        }
コード例 #4
0
        internal static DateTime GetValidCertDateFromValidityModel(
            PkixParameters paramsPkix,
            PkixCertPath certPath,
            int index)
        {
            if (paramsPkix.ValidityModel != PkixParameters.ChainValidityModel)
            {
                return(GetValidDate(paramsPkix));
            }

            // if end cert use given signing/encryption/... time
            if (index <= 0)
            {
                return(PkixCertPathValidatorUtilities.GetValidDate(paramsPkix));
                // else use time when previous cert was created
            }

            if (index - 1 == 0)
            {
                DerGeneralizedTime dateOfCertgen = null;
                try
                {
                    X509Certificate cert   = (X509Certificate)certPath.Certificates[index - 1];
                    Asn1OctetString extVal = cert.GetExtensionValue(
                        IsisMttObjectIdentifiers.IdIsisMttATDateOfCertGen);
                    dateOfCertgen = DerGeneralizedTime.GetInstance(extVal);
                }
                catch (ArgumentException)
                {
                    throw new Exception(
                              "Date of cert gen extension could not be read.");
                }
                if (dateOfCertgen != null)
                {
                    try
                    {
                        return(dateOfCertgen.ToDateTime());
                    }
                    catch (ArgumentException e)
                    {
                        throw new Exception(
                                  "Date from date of cert gen extension could not be parsed.",
                                  e);
                    }
                }
            }

            return(((X509Certificate)certPath.Certificates[index - 1]).NotBefore);
        }
コード例 #5
0
 internal static void ProcessAttrCert5(
     IX509AttributeCertificate attrCert,
     PkixParameters pkixParams)
 {
     try
     {
         attrCert.CheckValidity(PkixCertPathValidatorUtilities.GetValidDate(pkixParams));
     }
     catch (CertificateExpiredException e)
     {
         throw new PkixCertPathValidatorException(
                   "Attribute certificate is not valid.", e);
     }
     catch (CertificateNotYetValidException e)
     {
         throw new PkixCertPathValidatorException(
                   "Attribute certificate is not valid.", e);
     }
 }
コード例 #6
0
 internal static void AddAdditionalStoresFromCrlDistributionPoint(
     CrlDistPoint crldp,
     PkixParameters pkixParams)
 {
     if (crldp != null)
     {
         DistributionPoint[] dps = null;
         try
         {
             dps = crldp.GetDistributionPoints();
         }
         catch (Exception e)
         {
             throw new Exception(
                       "Distribution points could not be read.", e);
         }
         for (int i = 0; i < dps.Length; i++)
         {
             DistributionPointName dpn = dps[i].DistributionPointName;
             // look for URIs in fullName
             if (dpn != null)
             {
                 if (dpn.PointType == DistributionPointName.FullName)
                 {
                     GeneralName[] genNames = GeneralNames.GetInstance(
                         dpn.Name).GetNames();
                     // look for an URI
                     for (int j = 0; j < genNames.Length; j++)
                     {
                         if (genNames[j].TagNo == GeneralName.UniformResourceIdentifier)
                         {
                             string location = DerIA5String.GetInstance(
                                 genNames[j].Name).GetString();
                             PkixCertPathValidatorUtilities.AddAdditionalStoreFromLocation(
                                 location, pkixParams);
                         }
                     }
                 }
             }
         }
     }
 }
コード例 #7
0
        internal static void ProcessAttrCert7(
            IX509AttributeCertificate attrCert,
            PkixCertPath certPath,
            PkixCertPath holderCertPath,
            PkixParameters pkixParams)
        {
            // TODO:
            // AA Controls
            // Attribute encryption
            // Proxy
            ISet critExtOids = attrCert.GetCriticalExtensionOids();

            // 7.1
            // process extensions

            // target information checked in step 6 / X509AttributeCertStoreSelector
            if (critExtOids.Contains(X509Extensions.TargetInformation.Id))
            {
                try
                {
                    TargetInformation.GetInstance(PkixCertPathValidatorUtilities
                                                  .GetExtensionValue(attrCert, X509Extensions.TargetInformation));
                }
                catch (Exception e)
                {
                    throw new PkixCertPathValidatorException(
                              "Target information extension could not be read.", e);
                }
            }
            critExtOids.Remove(X509Extensions.TargetInformation.Id);
            foreach (PkixAttrCertChecker checker in pkixParams.GetAttrCertCheckers())
            {
                checker.Check(attrCert, certPath, holderCertPath, critExtOids);
            }
            if (!critExtOids.IsEmpty)
            {
                throw new PkixCertPathValidatorException(
                          "Attribute certificate contains unsupported critical extensions: "
                          + critExtOids);
            }
        }
コード例 #8
0
        /**
         * Validates an attribute certificate with the given certificate path.
         *
         * <p>
         * <code>params</code> must be an instance of
         * <code>ExtendedPkixParameters</code>.
         * </p><p>
         * The target constraints in the <code>params</code> must be an
         * <code>X509AttrCertStoreSelector</code> with at least the attribute
         * certificate criterion set. Obey that also target informations may be
         * necessary to correctly validate this attribute certificate.
         * </p><p>
         * The attribute certificate issuer must be added to the trusted attribute
         * issuers with {@link ExtendedPkixParameters#setTrustedACIssuers(Set)}.
         * </p>
         * @param certPath The certificate path which belongs to the attribute
         *            certificate issuer public key certificate.
         * @param params The PKIX parameters.
         * @return A <code>PKIXCertPathValidatorResult</code> of the result of
         *         validating the <code>certPath</code>.
         * @throws InvalidAlgorithmParameterException if <code>params</code> is
         *             inappropriate for this validator.
         * @throws CertPathValidatorException if the verification fails.
         */
        public virtual PkixCertPathValidatorResult Validate(
            PkixCertPath certPath,
            PkixParameters pkixParams)
        {
            IX509Selector certSelect = pkixParams.GetTargetConstraints();

            if (!(certSelect is X509AttrCertStoreSelector))
            {
                throw new ArgumentException(
                          "TargetConstraints must be an instance of " + typeof(X509AttrCertStoreSelector).FullName,
                          "pkixParams");
            }
            IX509AttributeCertificate attrCert = ((X509AttrCertStoreSelector)certSelect).AttributeCert;

            PkixCertPath holderCertPath            = Rfc3281CertPathUtilities.ProcessAttrCert1(attrCert, pkixParams);
            PkixCertPathValidatorResult result     = Rfc3281CertPathUtilities.ProcessAttrCert2(certPath, pkixParams);
            X509Certificate             issuerCert = (X509Certificate)certPath.Certificates[0];

            Rfc3281CertPathUtilities.ProcessAttrCert3(issuerCert, pkixParams);
            Rfc3281CertPathUtilities.ProcessAttrCert4(issuerCert, pkixParams);
            Rfc3281CertPathUtilities.ProcessAttrCert5(attrCert, pkixParams);
            // 6 already done in X509AttrCertStoreSelector
            Rfc3281CertPathUtilities.ProcessAttrCert7(attrCert, certPath, holderCertPath, pkixParams);
            Rfc3281CertPathUtilities.AdditionalChecks(attrCert, pkixParams);
            DateTime date;

            try
            {
                date = PkixCertPathValidatorUtilities.GetValidCertDateFromValidityModel(pkixParams, null, -1);
            }
            catch (Exception e)
            {
                throw new PkixCertPathValidatorException(
                          "Could not get validity date from attribute certificate.", e);
            }
            Rfc3281CertPathUtilities.CheckCrls(attrCert, pkixParams, issuerCert, date, certPath.Certificates);
            return(result);
        }
コード例 #9
0
 internal static void AddAdditionalStoresFromAltNames(
     X509Certificate cert,
     PkixParameters pkixParams)
 {
     // if in the IssuerAltName extension an URI
     // is given, add an additinal X.509 store
     if (cert.GetIssuerAlternativeNames() != null)
     {
         IEnumerator it = cert.GetIssuerAlternativeNames().GetEnumerator();
         while (it.MoveNext())
         {
             // look for URI
             IList list = (IList)it.Current;
             //if (list[0].Equals(new Integer(GeneralName.UniformResourceIdentifier)))
             if (list[0].Equals(GeneralName.UniformResourceIdentifier))
             {
                 // found
                 string temp = (string)list[1];
                 PkixCertPathValidatorUtilities.AddAdditionalStoreFromLocation(temp, pkixParams);
             }
         }
     }
 }
コード例 #10
0
        /**
         * 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);
        }
コード例 #11
0
        private PkixCertPathBuilderResult Build(
            IX509AttributeCertificate attrCert,
            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);

            PkixCertPathBuilderResult builderResult = null;

//			X509CertificateParser certParser = new X509CertificateParser();
            PkixAttrCertPathValidator validator = new PkixAttrCertPathValidator();

            try
            {
                // check whether the issuer of <tbvCert> is a TrustAnchor
                if (PkixCertPathValidatorUtilities.FindTrustAnchor(tbvCert, pkixParams.GetTrustAnchors()) != null)
                {
                    PkixCertPath certPath = new PkixCertPath(tbvPath);
                    PkixCertPathValidatorResult result;

                    try
                    {
                        result = 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 additional X.509 stores can be added from certificate locations.", e);
                    }

                    // try to get the issuer certificate from one of the stores
                    ISet 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)
                    {
                        // if untrusted self signed certificate continue
                        if (PkixCertPathValidatorUtilities.IsSelfIssued(issuer))
                        {
                            continue;
                        }

                        builderResult = Build(attrCert, issuer, pkixParams, tbvPath);

                        if (builderResult != null)
                        {
                            break;
                        }
                    }
                }
            }
            catch (Exception e)
            {
                certPathException = new Exception("No valid certification path could be build.", e);
            }

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

            return(builderResult);
        }
コード例 #12
0
        /**
         * Checks if an attribute certificate is revoked.
         *
         * @param attrCert Attribute certificate to check if it is revoked.
         * @param paramsPKIX PKIX parameters.
         * @param issuerCert The issuer certificate of the attribute certificate
         *            <code>attrCert</code>.
         * @param validDate The date when the certificate revocation status should
         *            be checked.
         * @param certPathCerts The certificates of the certification path to be
         *            checked.
         *
         * @throws CertPathValidatorException if the certificate is revoked or the
         *             status cannot be checked or some error occurs.
         */
        internal static void CheckCrls(
            IX509AttributeCertificate attrCert,
            PkixParameters paramsPKIX,
            X509Certificate issuerCert,
            DateTime validDate,
            IList certPathCerts)
        {
            if (paramsPKIX.IsRevocationEnabled)
            {
                // check if revocation is available
                if (attrCert.GetExtensionValue(X509Extensions.NoRevAvail) == null)
                {
                    CrlDistPoint crldp = null;
                    try
                    {
                        crldp = CrlDistPoint.GetInstance(
                            PkixCertPathValidatorUtilities.GetExtensionValue(
                                attrCert, X509Extensions.CrlDistributionPoints));
                    }
                    catch (Exception e)
                    {
                        throw new PkixCertPathValidatorException(
                                  "CRL distribution point extension could not be read.", e);
                    }
                    try
                    {
                        PkixCertPathValidatorUtilities
                        .AddAdditionalStoresFromCrlDistributionPoint(crldp, paramsPKIX);
                    }
                    catch (Exception e)
                    {
                        throw new PkixCertPathValidatorException(
                                  "No additional CRL locations could be decoded from CRL distribution point extension.", e);
                    }
                    CertStatus  certStatus  = new CertStatus();
                    ReasonsMask reasonsMask = new ReasonsMask();

                    Exception lastException = null;
                    bool      validCrlFound = false;
                    // for each distribution point
                    if (crldp != null)
                    {
                        DistributionPoint[] dps = null;
                        try
                        {
                            dps = crldp.GetDistributionPoints();
                        }
                        catch (Exception e)
                        {
                            throw new PkixCertPathValidatorException(
                                      "Distribution points could not be read.", e);
                        }
                        try
                        {
                            for (int i = 0; i < dps.Length &&
                                 certStatus.Status == CertStatus.Unrevoked &&
                                 !reasonsMask.IsAllReasons; i++)
                            {
                                PkixParameters paramsPKIXClone = (PkixParameters)paramsPKIX
                                                                 .Clone();
                                CheckCrl(dps[i], attrCert, paramsPKIXClone,
                                         validDate, issuerCert, certStatus, reasonsMask,
                                         certPathCerts);
                                validCrlFound = true;
                            }
                        }
                        catch (Exception e)
                        {
                            lastException = new Exception(
                                "No valid CRL for distribution point found.", e);
                        }
                    }

                    /*
                     * If the revocation status has not been determined, repeat the
                     * process above with any available CRLs not specified in a
                     * distribution point but issued by the certificate issuer.
                     */

                    if (certStatus.Status == CertStatus.Unrevoked &&
                        !reasonsMask.IsAllReasons)
                    {
                        try
                        {
                            /*
                             * assume a DP with both the reasons and the cRLIssuer
                             * fields omitted and a distribution point name of the
                             * certificate issuer.
                             */
                            Asn1Object issuer = null;
                            try
                            {
                                issuer = new Asn1InputStream(
                                    attrCert.Issuer.GetPrincipals()[0].GetEncoded()).ReadObject();
                            }
                            catch (Exception e)
                            {
                                throw new Exception(
                                          "Issuer from certificate for CRL could not be reencoded.",
                                          e);
                            }
                            DistributionPoint dp = new DistributionPoint(
                                new DistributionPointName(0, new GeneralNames(
                                                              new GeneralName(GeneralName.DirectoryName, issuer))), null, null);
                            PkixParameters paramsPKIXClone = (PkixParameters)paramsPKIX.Clone();
                            CheckCrl(dp, attrCert, paramsPKIXClone, validDate,
                                     issuerCert, certStatus, reasonsMask, certPathCerts);
                            validCrlFound = true;
                        }
                        catch (Exception e)
                        {
                            lastException = new Exception(
                                "No valid CRL for distribution point found.", e);
                        }
                    }

                    if (!validCrlFound)
                    {
                        throw new PkixCertPathValidatorException(
                                  "No valid CRL found.", lastException);
                    }
                    if (certStatus.Status != CertStatus.Unrevoked)
                    {
                        // TODO This format is forced by the NistCertPath tests
                        string formattedDate = certStatus.RevocationDate.Value.ToString(
                            "G", new CultureInfo("en-us"));
                        string message = "Attribute certificate revocation after "
                                         + formattedDate;
                        message += ", reason: "
                                   + Rfc3280CertPathUtilities.CrlReasons[certStatus.Status];
                        throw new PkixCertPathValidatorException(message);
                    }
                    if (!reasonsMask.IsAllReasons &&
                        certStatus.Status == CertStatus.Unrevoked)
                    {
                        certStatus.Status = CertStatus.Undetermined;
                    }
                    if (certStatus.Status == CertStatus.Undetermined)
                    {
                        throw new PkixCertPathValidatorException(
                                  "Attribute certificate status could not be determined.");
                    }
                }
                else
                {
                    if (attrCert.GetExtensionValue(X509Extensions.CrlDistributionPoints) != null ||
                        attrCert.GetExtensionValue(X509Extensions.AuthorityInfoAccess) != null)
                    {
                        throw new PkixCertPathValidatorException(
                                  "No rev avail extension is set, but also an AC revocation pointer.");
                    }
                }
            }
        }
コード例 #13
0
        /**
         *
         * Checks a distribution point for revocation information for the
         * certificate <code>attrCert</code>.
         *
         * @param dp The distribution point to consider.
         * @param attrCert The attribute certificate which should be checked.
         * @param paramsPKIX PKIX parameters.
         * @param validDate The date when the certificate revocation status should
         *            be checked.
         * @param issuerCert Certificate to check if it is revoked.
         * @param reasonMask The reasons mask which is already checked.
         * @param certPathCerts The certificates of the certification path to be
         *            checked.
         * @throws Exception if the certificate is revoked or the status
         *             cannot be checked or some error occurs.
         */
        private static void CheckCrl(
            DistributionPoint dp,
            IX509AttributeCertificate attrCert,
            PkixParameters paramsPKIX,
            DateTime validDate,
            X509Certificate issuerCert,
            CertStatus certStatus,
            ReasonsMask reasonMask,
            IList certPathCerts)
        {
            /*
             * 4.3.6 No Revocation Available
             *
             * The noRevAvail extension, defined in [X.509-2000], allows an AC
             * issuer to indicate that no revocation information will be made
             * available for this AC.
             */
            if (attrCert.GetExtensionValue(X509Extensions.NoRevAvail) != null)
            {
                return;
            }

            DateTime currentDate = DateTime.UtcNow;

            if (validDate.CompareTo(currentDate) > 0)
            {
                throw new Exception("Validation time is in future.");
            }

            // (a)

            /*
             * We always get timely valid CRLs, so there is no step (a) (1).
             * "locally cached" CRLs are assumed to be in getStore(), additional
             * CRLs must be enabled in the ExtendedPkixParameters and are in
             * getAdditionalStore()
             */
            ISet crls = PkixCertPathValidatorUtilities.GetCompleteCrls(dp, attrCert,
                                                                       currentDate, paramsPKIX);
            bool      validCrlFound = false;
            Exception lastException = null;

            IEnumerator crl_iter = crls.GetEnumerator();

            while (crl_iter.MoveNext() &&
                   certStatus.Status == CertStatus.Unrevoked &&
                   !reasonMask.IsAllReasons)
            {
                try
                {
                    X509Crl crl = (X509Crl)crl_iter.Current;

                    // (d)
                    ReasonsMask interimReasonsMask = Rfc3280CertPathUtilities.ProcessCrlD(crl, dp);

                    // (e)

                    /*
                     * The reasons mask is updated at the end, so only valid CRLs
                     * can update it. If this CRL does not contain new reasons it
                     * must be ignored.
                     */
                    if (!interimReasonsMask.HasNewReasons(reasonMask))
                    {
                        continue;
                    }

                    // (f)
                    ISet keys = Rfc3280CertPathUtilities.ProcessCrlF(crl, attrCert,
                                                                     null, null, paramsPKIX, certPathCerts);
                    // (g)
                    AsymmetricKeyParameter pubKey = Rfc3280CertPathUtilities.ProcessCrlG(crl, keys);

                    X509Crl deltaCRL = null;

                    if (paramsPKIX.IsUseDeltasEnabled)
                    {
                        // get delta CRLs
                        ISet deltaCRLs = PkixCertPathValidatorUtilities.GetDeltaCrls(
                            currentDate, paramsPKIX, crl);
                        // we only want one valid delta CRL
                        // (h)
                        deltaCRL = Rfc3280CertPathUtilities.ProcessCrlH(deltaCRLs, pubKey);
                    }

                    /*
                     * CRL must be be valid at the current time, not the validation
                     * time. If a certificate is revoked with reason keyCompromise,
                     * cACompromise, it can be used for forgery, also for the past.
                     * This reason may not be contained in older CRLs.
                     */

                    /*
                     * in the chain model signatures stay valid also after the
                     * certificate has been expired, so they do not have to be in
                     * the CRL vality time
                     */
                    if (paramsPKIX.ValidityModel != PkixParameters.ChainValidityModel)
                    {
                        /*
                         * if a certificate has expired, but was revoked, it is not
                         * more in the CRL, so it would be regarded as valid if the
                         * first check is not done
                         */
                        if (attrCert.NotAfter.CompareTo(crl.ThisUpdate) < 0)
                        {
                            throw new Exception(
                                      "No valid CRL for current time found.");
                        }
                    }

                    Rfc3280CertPathUtilities.ProcessCrlB1(dp, attrCert, crl);

                    // (b) (2)
                    Rfc3280CertPathUtilities.ProcessCrlB2(dp, attrCert, crl);

                    // (c)
                    Rfc3280CertPathUtilities.ProcessCrlC(deltaCRL, crl, paramsPKIX);

                    // (i)
                    Rfc3280CertPathUtilities.ProcessCrlI(validDate, deltaCRL,
                                                         attrCert, certStatus, paramsPKIX);

                    // (j)
                    Rfc3280CertPathUtilities.ProcessCrlJ(validDate, crl, attrCert,
                                                         certStatus);

                    // (k)
                    if (certStatus.Status == CrlReason.RemoveFromCrl)
                    {
                        certStatus.Status = CertStatus.Unrevoked;
                    }

                    // update reasons mask
                    reasonMask.AddReasons(interimReasonsMask);
                    validCrlFound = true;
                }
                catch (Exception e)
                {
                    lastException = e;
                }
            }
            if (!validCrlFound)
            {
                throw lastException;
            }
        }
コード例 #14
0
        /**
         * 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);
        }
コード例 #15
0
        public virtual PkixCertPathValidatorResult Validate(
            PkixCertPath certPath,
            PkixParameters paramsPkix)
        {
            if (paramsPkix.GetTrustAnchors() == null)
            {
                throw new ArgumentException(
                          "trustAnchors is null, this is not allowed for certification path validation.",
                          "parameters");
            }

            //
            // 6.1.1 - inputs
            //

            //
            // (a)
            //
            IList certs = certPath.Certificates;
            int   n     = certs.Count;

            if (certs.Count == 0)
            {
                throw new PkixCertPathValidatorException("Certification path is empty.", null, certPath, 0);
            }

            //
            // (b)
            //
            // DateTime validDate = PkixCertPathValidatorUtilities.GetValidDate(paramsPkix);

            //
            // (c)
            //
            ISet userInitialPolicySet = paramsPkix.GetInitialPolicies();

            //
            // (d)
            //
            TrustAnchor trust;

            try
            {
                trust = PkixCertPathValidatorUtilities.FindTrustAnchor(
                    (X509Certificate)certs[certs.Count - 1],
                    paramsPkix.GetTrustAnchors());
            }
            catch (Exception e)
            {
                throw new PkixCertPathValidatorException(e.Message, e, certPath, certs.Count - 1);
            }

            if (trust == null)
            {
                throw new PkixCertPathValidatorException("Trust anchor for certification path not found.", null, certPath, -1);
            }

            //
            // (e), (f), (g) are part of the paramsPkix object.
            //
            IEnumerator certIter;
            int         index = 0;
            int         i;

            // Certificate for each interation of the validation loop
            // Signature information for each iteration of the validation loop
            //
            // 6.1.2 - setup
            //

            //
            // (a)
            //
            IList[] policyNodes = new IList[n + 1];
            for (int j = 0; j < policyNodes.Length; j++)
            {
                policyNodes[j] = Platform.CreateArrayList();
            }

            ISet policySet = new HashSet();

            policySet.Add(Rfc3280CertPathUtilities.ANY_POLICY);

            PkixPolicyNode validPolicyTree = new PkixPolicyNode(Platform.CreateArrayList(), 0, policySet, null, new HashSet(),
                                                                Rfc3280CertPathUtilities.ANY_POLICY, false);

            policyNodes[0].Add(validPolicyTree);

            //
            // (b) and (c)
            //
            PkixNameConstraintValidator nameConstraintValidator = new PkixNameConstraintValidator();

            // (d)
            //
            int  explicitPolicy;
            ISet acceptablePolicies = new HashSet();

            if (paramsPkix.IsExplicitPolicyRequired)
            {
                explicitPolicy = 0;
            }
            else
            {
                explicitPolicy = n + 1;
            }

            //
            // (e)
            //
            int inhibitAnyPolicy;

            if (paramsPkix.IsAnyPolicyInhibited)
            {
                inhibitAnyPolicy = 0;
            }
            else
            {
                inhibitAnyPolicy = n + 1;
            }

            //
            // (f)
            //
            int policyMapping;

            if (paramsPkix.IsPolicyMappingInhibited)
            {
                policyMapping = 0;
            }
            else
            {
                policyMapping = n + 1;
            }

            //
            // (g), (h), (i), (j)
            //
            AsymmetricKeyParameter workingPublicKey;
            X509Name workingIssuerName;

            X509Certificate sign = trust.TrustedCert;

            try
            {
                if (sign != null)
                {
                    workingIssuerName = sign.SubjectDN;
                    workingPublicKey  = sign.GetPublicKey();
                }
                else
                {
                    workingIssuerName = new X509Name(trust.CAName);
                    workingPublicKey  = trust.CAPublicKey;
                }
            }
            catch (ArgumentException ex)
            {
                throw new PkixCertPathValidatorException("Subject of trust anchor could not be (re)encoded.", ex, certPath,
                                                         -1);
            }

            AlgorithmIdentifier workingAlgId = null;

            try
            {
                workingAlgId = PkixCertPathValidatorUtilities.GetAlgorithmIdentifier(workingPublicKey);
            }
            catch (PkixCertPathValidatorException e)
            {
                throw new PkixCertPathValidatorException(
                          "Algorithm identifier of public key of trust anchor could not be read.", e, certPath, -1);
            }

//			DerObjectIdentifier workingPublicKeyAlgorithm = workingAlgId.ObjectID;
//			Asn1Encodable workingPublicKeyParameters = workingAlgId.Parameters;

            //
            // (k)
            //
            int maxPathLength = n;

            //
            // 6.1.3
            //

            X509CertStoreSelector certConstraints = paramsPkix.GetTargetCertConstraints();

            if (certConstraints != null && !certConstraints.Match((X509Certificate)certs[0]))
            {
                throw new PkixCertPathValidatorException(
                          "Target certificate in certification path does not match targetConstraints.", null, certPath, 0);
            }

            //
            // initialize CertPathChecker's
            //
            IList pathCheckers = paramsPkix.GetCertPathCheckers();

            certIter = pathCheckers.GetEnumerator();

            while (certIter.MoveNext())
            {
                ((PkixCertPathChecker)certIter.Current).Init(false);
            }

            X509Certificate cert = null;

            for (index = certs.Count - 1; index >= 0; index--)
            {
                // try
                // {
                //
                // i as defined in the algorithm description
                //
                i = n - index;

                //
                // set certificate to be checked in this round
                // sign and workingPublicKey and workingIssuerName are set
                // at the end of the for loop and initialized the
                // first time from the TrustAnchor
                //
                cert = (X509Certificate)certs[index];

                //
                // 6.1.3
                //

                Rfc3280CertPathUtilities.ProcessCertA(certPath, paramsPkix, index, workingPublicKey,
                                                      workingIssuerName, sign);

                Rfc3280CertPathUtilities.ProcessCertBC(certPath, index, nameConstraintValidator);

                validPolicyTree = Rfc3280CertPathUtilities.ProcessCertD(certPath, index,
                                                                        acceptablePolicies, validPolicyTree, policyNodes, inhibitAnyPolicy);

                validPolicyTree = Rfc3280CertPathUtilities.ProcessCertE(certPath, index, validPolicyTree);

                Rfc3280CertPathUtilities.ProcessCertF(certPath, index, validPolicyTree, explicitPolicy);

                //
                // 6.1.4
                //

                if (i != n)
                {
                    if (cert != null && cert.Version == 1)
                    {
                        throw new PkixCertPathValidatorException(
                                  "Version 1 certificates can't be used as CA ones.", null, certPath, index);
                    }

                    Rfc3280CertPathUtilities.PrepareNextCertA(certPath, index);

                    validPolicyTree = Rfc3280CertPathUtilities.PrepareCertB(certPath, index, policyNodes,
                                                                            validPolicyTree, policyMapping);

                    Rfc3280CertPathUtilities.PrepareNextCertG(certPath, index, nameConstraintValidator);

                    // (h)
                    explicitPolicy   = Rfc3280CertPathUtilities.PrepareNextCertH1(certPath, index, explicitPolicy);
                    policyMapping    = Rfc3280CertPathUtilities.PrepareNextCertH2(certPath, index, policyMapping);
                    inhibitAnyPolicy = Rfc3280CertPathUtilities.PrepareNextCertH3(certPath, index, inhibitAnyPolicy);

                    //
                    // (i)
                    //
                    explicitPolicy = Rfc3280CertPathUtilities.PrepareNextCertI1(certPath, index, explicitPolicy);
                    policyMapping  = Rfc3280CertPathUtilities.PrepareNextCertI2(certPath, index, policyMapping);

                    // (j)
                    inhibitAnyPolicy = Rfc3280CertPathUtilities.PrepareNextCertJ(certPath, index, inhibitAnyPolicy);

                    // (k)
                    Rfc3280CertPathUtilities.PrepareNextCertK(certPath, index);

                    // (l)
                    maxPathLength = Rfc3280CertPathUtilities.PrepareNextCertL(certPath, index, maxPathLength);

                    // (m)
                    maxPathLength = Rfc3280CertPathUtilities.PrepareNextCertM(certPath, index, maxPathLength);

                    // (n)
                    Rfc3280CertPathUtilities.PrepareNextCertN(certPath, index);

                    ISet criticalExtensions1 = cert.GetCriticalExtensionOids();

                    if (criticalExtensions1 != null)
                    {
                        criticalExtensions1 = new HashSet(criticalExtensions1);

                        // these extensions are handled by the algorithm
                        criticalExtensions1.Remove(X509Extensions.KeyUsage.Id);
                        criticalExtensions1.Remove(X509Extensions.CertificatePolicies.Id);
                        criticalExtensions1.Remove(X509Extensions.PolicyMappings.Id);
                        criticalExtensions1.Remove(X509Extensions.InhibitAnyPolicy.Id);
                        criticalExtensions1.Remove(X509Extensions.IssuingDistributionPoint.Id);
                        criticalExtensions1.Remove(X509Extensions.DeltaCrlIndicator.Id);
                        criticalExtensions1.Remove(X509Extensions.PolicyConstraints.Id);
                        criticalExtensions1.Remove(X509Extensions.BasicConstraints.Id);
                        criticalExtensions1.Remove(X509Extensions.SubjectAlternativeName.Id);
                        criticalExtensions1.Remove(X509Extensions.NameConstraints.Id);
                    }
                    else
                    {
                        criticalExtensions1 = new HashSet();
                    }

                    // (o)
                    Rfc3280CertPathUtilities.PrepareNextCertO(certPath, index, criticalExtensions1, pathCheckers);

                    // set signing certificate for next round
                    sign = cert;

                    // (c)
                    workingIssuerName = sign.SubjectDN;

                    // (d)
                    try
                    {
                        workingPublicKey = PkixCertPathValidatorUtilities.GetNextWorkingKey(certPath.Certificates, index);
                    }
                    catch (PkixCertPathValidatorException e)
                    {
                        throw new PkixCertPathValidatorException("Next working key could not be retrieved.", e, certPath, index);
                    }

                    workingAlgId = PkixCertPathValidatorUtilities.GetAlgorithmIdentifier(workingPublicKey);
                    // (f)
//                    workingPublicKeyAlgorithm = workingAlgId.ObjectID;
                    // (e)
//                    workingPublicKeyParameters = workingAlgId.Parameters;
                }
            }

            //
            // 6.1.5 Wrap-up procedure
            //

            explicitPolicy = Rfc3280CertPathUtilities.WrapupCertA(explicitPolicy, cert);

            explicitPolicy = Rfc3280CertPathUtilities.WrapupCertB(certPath, index + 1, explicitPolicy);

            //
            // (c) (d) and (e) are already done
            //

            //
            // (f)
            //
            ISet criticalExtensions = cert.GetCriticalExtensionOids();

            if (criticalExtensions != null)
            {
                criticalExtensions = new HashSet(criticalExtensions);

                // Requires .Id
                // these extensions are handled by the algorithm
                criticalExtensions.Remove(X509Extensions.KeyUsage.Id);
                criticalExtensions.Remove(X509Extensions.CertificatePolicies.Id);
                criticalExtensions.Remove(X509Extensions.PolicyMappings.Id);
                criticalExtensions.Remove(X509Extensions.InhibitAnyPolicy.Id);
                criticalExtensions.Remove(X509Extensions.IssuingDistributionPoint.Id);
                criticalExtensions.Remove(X509Extensions.DeltaCrlIndicator.Id);
                criticalExtensions.Remove(X509Extensions.PolicyConstraints.Id);
                criticalExtensions.Remove(X509Extensions.BasicConstraints.Id);
                criticalExtensions.Remove(X509Extensions.SubjectAlternativeName.Id);
                criticalExtensions.Remove(X509Extensions.NameConstraints.Id);
                criticalExtensions.Remove(X509Extensions.CrlDistributionPoints.Id);
            }
            else
            {
                criticalExtensions = new HashSet();
            }

            Rfc3280CertPathUtilities.WrapupCertF(certPath, index + 1, pathCheckers, criticalExtensions);

            PkixPolicyNode intersection = Rfc3280CertPathUtilities.WrapupCertG(certPath, paramsPkix, userInitialPolicySet,
                                                                               index + 1, policyNodes, validPolicyTree, acceptablePolicies);

            if ((explicitPolicy > 0) || (intersection != null))
            {
                return(new PkixCertPathValidatorResult(trust, intersection, cert.GetPublicKey()));
            }

            throw new PkixCertPathValidatorException("Path processing failed on policy.", null, certPath, index);
        }