/// <summary>Constructor</summary>
/// <param name="forward">Certificate from the other CA to this CA.</param>
/// <param name="reverse">Certificate from this CA to the other CA.</param>
public X509CertificatePair(
X509Certificate forward,
X509Certificate reverse)
{
this.forward = forward;
this.reverse = reverse;
}
/**
* basic creation - only the default attributes will be included here.
*/
public TimeStampTokenGenerator(
AsymmetricKeyParameter key,
X509Certificate cert,
string digestOID,
string tsaPolicyOID)
: this(key, cert, digestOID, tsaPolicyOID, null, null)
{
}
/**
* create from an issuer certificate and the serial number of the
* certificate it signed.
* @exception OcspException if any problems occur creating the id fields.
*/
public CertificateID(
string hashAlgorithm,
X509Certificate issuerCert,
BigInteger serialNumber)
{
AlgorithmIdentifier hashAlg = new AlgorithmIdentifier(
new DerObjectIdentifier(hashAlgorithm), DerNull.Instance);
this.id = createCertID(hashAlg, issuerCert, new DerInteger(serialNumber));
}
/// <summary>Constructor from a ASN.1 CertificatePair structure.</summary>
/// <param name="pair">The <c>CertificatePair</c> ASN.1 object.</param>
public X509CertificatePair(
CertificatePair pair)
{
if (pair.Forward != null)
{
this.forward = new X509Certificate(pair.Forward);
}
if (pair.Reverse != null)
{
this.reverse = new X509Certificate(pair.Reverse);
}
}
/**
* create with a signer with extra signed/unsigned attributes.
*/
public TimeStampTokenGenerator(
AsymmetricKeyParameter key,
X509Certificate cert,
string digestOID,
string tsaPolicyOID,
Asn1.Cms.AttributeTable signedAttr,
Asn1.Cms.AttributeTable unsignedAttr)
{
this.key = key;
this.cert = cert;
this.digestOID = digestOID;
this.tsaPolicyOID = tsaPolicyOID;
this.unsignedAttr = unsignedAttr;
TspUtil.ValidateCertificate(cert);
//
// Add the ESSCertID attribute
//
IDictionary signedAttrs;
if (signedAttr != null)
{
signedAttrs = signedAttr.ToDictionary();
}
else
{
signedAttrs = Platform.CreateHashtable();
}
try
{
byte[] hash = DigestUtilities.CalculateDigest("SHA-1", cert.GetEncoded());
EssCertID essCertid = new EssCertID(hash);
Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(
PkcsObjectIdentifiers.IdAASigningCertificate,
new DerSet(new SigningCertificate(essCertid)));
signedAttrs[attr.AttrType] = attr;
}
catch (CertificateEncodingException e)
{
throw new TspException("Exception processing certificate.", e);
}
catch (SecurityUtilityException e)
{
throw new TspException("Can't find a SHA-1 implementation.", e);
}
this.signedAttr = new Asn1.Cms.AttributeTable(signedAttrs);
}
/// <summary>
/// Creates an instance of TrustAnchor with the specified X509Certificate and
/// optional name constraints, which are intended to be used as additional
/// constraints when validating an X.509 certification path.
/// The name constraints are specified as a byte array. This byte array
/// should contain the DER encoded form of the name constraints, as they
/// would appear in the NameConstraints structure defined in RFC 2459 and
/// X.509. The ASN.1 definition of this structure appears below.
///
/// <pre>
/// NameConstraints ::= SEQUENCE {
/// permittedSubtrees [0] GeneralSubtrees OPTIONAL,
/// excludedSubtrees [1] GeneralSubtrees OPTIONAL }
///
/// GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree
///
/// GeneralSubtree ::= SEQUENCE {
/// base GeneralName,
/// minimum [0] BaseDistance DEFAULT 0,
/// maximum [1] BaseDistance OPTIONAL }
///
/// BaseDistance ::= INTEGER (0..MAX)
///
/// GeneralName ::= CHOICE {
/// otherName [0] OtherName,
/// rfc822Name [1] IA5String,
/// dNSName [2] IA5String,
/// x400Address [3] ORAddress,
/// directoryName [4] Name,
/// ediPartyName [5] EDIPartyName,
/// uniformResourceIdentifier [6] IA5String,
/// iPAddress [7] OCTET STRING,
/// registeredID [8] OBJECT IDENTIFIER}
/// </pre>
///
/// Note that the name constraints byte array supplied is cloned to protect
/// against subsequent modifications.
/// </summary>
/// <param name="trustedCert">a trusted X509Certificate</param>
/// <param name="nameConstraints">a byte array containing the ASN.1 DER encoding of a
/// NameConstraints extension to be used for checking name
/// constraints. Only the value of the extension is included, not
/// the OID or criticality flag. Specify null to omit the
/// parameter.</param>
/// <exception cref="ArgumentNullException">if the specified X509Certificate is null</exception>
public TrustAnchor(
X509Certificate trustedCert,
byte[] nameConstraints)
{
if (trustedCert == null)
throw new ArgumentNullException("trustedCert");
this.trustedCert = trustedCert;
this.pubKey = null;
this.caName = null;
this.caPrincipal = null;
setNameConstraints(nameConstraints);
}
/// <summary>Return the subject of the given cert as an X509Principal.</summary>
public static X509Name GetSubjectX509Principal(
X509Certificate cert)
{
try
{
TbsCertificateStructure tbsCert = TbsCertificateStructure.GetInstance(
Asn1Object.FromByteArray(cert.GetTbsCertificate()));
return tbsCert.Subject;
}
catch (Exception e)
{
throw new CertificateEncodingException("Could not extract subject", e);
}
}
public AttributeCertificateHolder(
X509Certificate cert)
{
X509Name name;
try
{
name = PrincipalUtilities.GetIssuerX509Principal(cert);
}
catch (Exception e)
{
throw new CertificateParsingException(e.Message);
}
holder = new Holder(new IssuerSerial(GenerateGeneralNames(name), new DerInteger(cert.SerialNumber)));
}
public X509CrlStoreSelector(
X509CrlStoreSelector o)
{
this.certificateChecking = o.CertificateChecking;
this.dateAndTime = o.DateAndTime;
this.issuers = o.Issuers;
this.maxCrlNumber = o.MaxCrlNumber;
this.minCrlNumber = o.MinCrlNumber;
this.deltaCrlIndicatorEnabled = o.DeltaCrlIndicatorEnabled;
this.completeCrlEnabled = o.CompleteCrlEnabled;
this.maxBaseCrlNumber = o.MaxBaseCrlNumber;
this.attrCertChecking = o.AttrCertChecking;
this.issuingDistributionPointEnabled = o.IssuingDistributionPointEnabled;
this.issuingDistributionPoint = o.IssuingDistributionPoint;
}
public string GetCertificateAlias(X509Certificate cert)
{
if (cert == null)
{
throw new ArgumentNullException("cert");
}
foreach (DictionaryEntry entry in _certs)
{
var entryValue = (X509CertificateEntry) entry.Value;
if (entryValue.Certificate.Equals(cert))
{
return (string) entry.Key;
}
}
foreach (DictionaryEntry entry in _keyCerts)
{
var entryValue = (X509CertificateEntry) entry.Value;
if (entryValue.Certificate.Equals(cert))
{
return (string) entry.Key;
}
}
return null;
}
/// <summary>
/// Creates an instance of <c>TrustAnchor</c> where the
/// most-trusted CA is specified as an X500Principal and public key.
/// </summary>
/// <remarks>
/// <p>
/// Name constraints are an optional parameter, and are intended to be used
/// as additional constraints when validating an X.509 certification path.
/// </p><p>
/// The name constraints are specified as a byte array. This byte array
/// contains the DER encoded form of the name constraints, as they
/// would appear in the NameConstraints structure defined in RFC 2459
/// and X.509. The ASN.1 notation for this structure is supplied in the
/// documentation for the other constructors.
/// </p><p>
/// Note that the name constraints byte array supplied here is cloned to
/// protect against subsequent modifications.
/// </p>
/// </remarks>
/// <param name="caPrincipal">the name of the most-trusted CA as X509Name</param>
/// <param name="pubKey">the public key of the most-trusted CA</param>
/// <param name="nameConstraints">
/// a byte array containing the ASN.1 DER encoding of a NameConstraints extension to
/// be used for checking name constraints. Only the value of the extension is included,
/// not the OID or criticality flag. Specify <c>null</c> to omit the parameter.
/// </param>
/// <exception cref="ArgumentNullException">
/// if <c>caPrincipal</c> or <c>pubKey</c> is null
/// </exception>
public TrustAnchor(
X509Name caPrincipal,
AsymmetricKeyParameter pubKey,
byte[] nameConstraints)
{
if (caPrincipal == null)
throw new ArgumentNullException("caPrincipal");
if (pubKey == null)
throw new ArgumentNullException("pubKey");
this.trustedCert = null;
this.caPrincipal = caPrincipal;
this.caName = caPrincipal.ToString();
this.pubKey = pubKey;
setNameConstraints(nameConstraints);
}
private OcspReq GenerateRequest(
DerObjectIdentifier signingAlgorithm,
AsymmetricKeyParameter privateKey,
X509Certificate[] chain,
SecureRandom random)
{
Asn1EncodableVector requests = new Asn1EncodableVector();
foreach (RequestObject reqObj in list)
{
try
{
requests.Add(reqObj.ToRequest());
}
catch (Exception e)
{
throw new OcspException("exception creating Request", e);
}
}
TbsRequest tbsReq = new TbsRequest(requestorName, new DerSequence(requests), requestExtensions);
ISigner sig = null;
Signature signature = null;
if (signingAlgorithm != null)
{
if (requestorName == null)
{
throw new OcspException("requestorName must be specified if request is signed.");
}
try
{
sig = SignerUtilities.GetSigner(signingAlgorithm.Id);
if (random != null)
{
sig.Init(true, new ParametersWithRandom(privateKey, random));
}
else
{
sig.Init(true, privateKey);
}
}
catch (Exception e)
{
throw new OcspException("exception creating signature: " + e, e);
}
DerBitString bitSig = null;
try
{
byte[] encoded = tbsReq.GetEncoded();
sig.BlockUpdate(encoded, 0, encoded.Length);
bitSig = new DerBitString(sig.GenerateSignature());
}
catch (Exception e)
{
throw new OcspException("exception processing TBSRequest: " + e, e);
}
AlgorithmIdentifier sigAlgId = new AlgorithmIdentifier(signingAlgorithm, DerNull.Instance);
if (chain != null && chain.Length > 0)
{
Asn1EncodableVector v = new Asn1EncodableVector();
try
{
for (int i = 0; i != chain.Length; i++)
{
v.Add(
X509CertificateStructure.GetInstance(
Asn1Object.FromByteArray(chain[i].GetEncoded())));
}
}
catch (IOException e)
{
throw new OcspException("error processing certs", e);
}
catch (CertificateEncodingException e)
{
throw new OcspException("error encoding certs", e);
}
signature = new Signature(sigAlgId, bitSig, new DerSequence(v));
}
else
{
signature = new Signature(sigAlgId, bitSig);
}
}
return new OcspReq(new OcspRequest(tbsReq, signature));
}
internal static void ProcessCertA(
PkixCertPath certPath,
PkixParameters paramsPKIX,
int index,
AsymmetricKeyParameter workingPublicKey,
X509Name workingIssuerName,
X509Certificate sign)
{
IList certs = certPath.Certificates;
X509Certificate cert = (X509Certificate)certs[index];
//
// (a) verify
//
try
{
// (a) (1)
//
cert.Verify(workingPublicKey);
}
catch (GeneralSecurityException e)
{
throw new PkixCertPathValidatorException("Could not validate certificate signature.", e, certPath, index);
}
try
{
// (a) (2)
//
cert.CheckValidity(PkixCertPathValidatorUtilities
.GetValidCertDateFromValidityModel(paramsPKIX, certPath, index));
}
catch (CertificateExpiredException e)
{
throw new PkixCertPathValidatorException("Could not validate certificate: " + e.Message, e, certPath, index);
}
catch (CertificateNotYetValidException e)
{
throw new PkixCertPathValidatorException("Could not validate certificate: " + e.Message, e, certPath, index);
}
catch (Exception e)
{
throw new PkixCertPathValidatorException("Could not validate time of certificate.", e, certPath, index);
}
//
// (a) (3)
//
if (paramsPKIX.IsRevocationEnabled)
{
try
{
CheckCrls(paramsPKIX, cert, PkixCertPathValidatorUtilities.GetValidCertDateFromValidityModel(paramsPKIX,
certPath, index), sign, workingPublicKey, certs);
}
catch (Exception e)
{
Exception cause = e.InnerException;
if (cause == null)
{
cause = e;
}
throw new PkixCertPathValidatorException(e.Message, cause, certPath, index);
}
}
//
// (a) (4) name chaining
//
X509Name issuer = PkixCertPathValidatorUtilities.GetIssuerPrincipal(cert);
if (!issuer.Equivalent(workingIssuerName, true))
{
throw new PkixCertPathValidatorException("IssuerName(" + issuer
+ ") does not match SubjectName(" + workingIssuerName + ") of signing certificate.", null,
certPath, index);
}
}
/**
* Obtain and validate the certification path for the complete CRL issuer.
* If a key usage extension is present in the CRL issuer's certificate,
* verify that the cRLSign bit is set.
*
* @param crl CRL which contains revocation information for the certificate
* <code>cert</code>.
* @param cert The attribute certificate or certificate to check if it is
* revoked.
* @param defaultCRLSignCert The issuer certificate of the certificate <code>cert</code>.
* @param defaultCRLSignKey The public key of the issuer certificate
* <code>defaultCRLSignCert</code>.
* @param paramsPKIX paramsPKIX PKIX parameters.
* @param certPathCerts The certificates on the certification path.
* @return A <code>Set</code> with all keys of possible CRL issuer
* certificates.
* @throws AnnotatedException if the CRL is not valid or the status cannot be checked or
* some error occurs.
*/
internal static ISet ProcessCrlF(
X509Crl crl,
object cert,
X509Certificate defaultCRLSignCert,
AsymmetricKeyParameter defaultCRLSignKey,
PkixParameters paramsPKIX,
IList certPathCerts)
{
// (f)
// get issuer from CRL
X509CertStoreSelector selector = new X509CertStoreSelector();
try
{
selector.Subject = crl.IssuerDN;
}
catch (IOException e)
{
throw new Exception(
"Subject criteria for certificate selector to find issuer certificate for CRL could not be set.", e);
}
// get CRL signing certs
IList coll = Platform.CreateArrayList();
try
{
CollectionUtilities.AddRange(coll, PkixCertPathValidatorUtilities.FindCertificates(selector, paramsPKIX.GetStores()));
CollectionUtilities.AddRange(coll, PkixCertPathValidatorUtilities.FindCertificates(selector, paramsPKIX.GetAdditionalStores()));
}
catch (Exception e)
{
throw new Exception("Issuer certificate for CRL cannot be searched.", e);
}
coll.Add(defaultCRLSignCert);
IEnumerator cert_it = coll.GetEnumerator();
IList validCerts = Platform.CreateArrayList();
IList validKeys = Platform.CreateArrayList();
while (cert_it.MoveNext())
{
X509Certificate signingCert = (X509Certificate)cert_it.Current;
/*
* CA of the certificate, for which this CRL is checked, has also
* signed CRL, so skip the path validation, because is already done
*/
if (signingCert.Equals(defaultCRLSignCert))
{
validCerts.Add(signingCert);
validKeys.Add(defaultCRLSignKey);
continue;
}
try
{
// CertPathBuilder builder = CertPathBuilder.GetInstance("PKIX");
PkixCertPathBuilder builder = new PkixCertPathBuilder();
selector = new X509CertStoreSelector();
selector.Certificate = signingCert;
PkixParameters temp = (PkixParameters)paramsPKIX.Clone();
temp.SetTargetCertConstraints(selector);
PkixBuilderParameters parameters = (PkixBuilderParameters)
PkixBuilderParameters.GetInstance(temp);
/*
* if signingCert is placed not higher on the cert path a
* dependency loop results. CRL for cert is checked, but
* signingCert is needed for checking the CRL which is dependent
* on checking cert because it is higher in the cert path and so
* signing signingCert transitively. so, revocation is disabled,
* forgery attacks of the CRL are detected in this outer loop
* for all other it must be enabled to prevent forgery attacks
*/
if (certPathCerts.Contains(signingCert))
{
parameters.IsRevocationEnabled = false;
}
else
{
parameters.IsRevocationEnabled = true;
}
IList certs = builder.Build(parameters).CertPath.Certificates;
validCerts.Add(signingCert);
validKeys.Add(PkixCertPathValidatorUtilities.GetNextWorkingKey(certs, 0));
}
catch (PkixCertPathBuilderException e)
{
throw new Exception("Internal error.", e);
}
catch (PkixCertPathValidatorException e)
{
throw new Exception("Public key of issuer certificate of CRL could not be retrieved.", e);
}
//catch (Exception e)
//{
// throw new Exception(e.Message);
//}
}
ISet checkKeys = new HashSet();
Exception lastException = null;
for (int i = 0; i < validCerts.Count; i++)
{
X509Certificate signCert = (X509Certificate)validCerts[i];
bool[] keyusage = signCert.GetKeyUsage();
if (keyusage != null && (keyusage.Length < 7 || !keyusage[CRL_SIGN]))
{
lastException = new Exception(
"Issuer certificate key usage extension does not permit CRL signing.");
}
else
{
checkKeys.Add(validKeys[i]);
}
}
if ((checkKeys.Count == 0) && lastException == null)
{
throw new Exception("Cannot find a valid issuer certificate.");
}
if ((checkKeys.Count == 0) && lastException != null)
{
throw lastException;
}
return checkKeys;
}
public OcspReq Generate(
string signingAlgorithm,
AsymmetricKeyParameter privateKey,
X509Certificate[] chain,
SecureRandom random)
{
if (signingAlgorithm == null)
throw new ArgumentException("no signing algorithm specified");
try
{
DerObjectIdentifier oid = OcspUtilities.GetAlgorithmOid(signingAlgorithm);
return GenerateRequest(oid, privateKey, chain, random);
}
catch (ArgumentException)
{
throw new ArgumentException("unknown signing algorithm specified: " + signingAlgorithm);
}
}
public X509Certificate[] GetCerts()
{
if (!this.IsSigned)
return null;
IList certs = this.GetCertList();
X509Certificate[] result = new X509Certificate[certs.Count];
for (int i = 0; i < certs.Count; ++i)
{
result[i] = (X509Certificate)certs[i];
}
return result;
}
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;
}
/**
* Validate the time stamp token.
* <p>
* To be valid the token must be signed by the passed in certificate and
* the certificate must be the one referred to by the SigningCertificate
* attribute included in the hashed attributes of the token. The
* certificate must also have the ExtendedKeyUsageExtension with only
* KeyPurposeID.IdKPTimeStamping and have been valid at the time the
* timestamp was created.
* </p>
* <p>
* A successful call to validate means all the above are true.
* </p>
*/
public void Validate(
X509Certificate cert)
{
try
{
byte[] hash = DigestUtilities.CalculateDigest(
certID.GetHashAlgorithm(), cert.GetEncoded());
if (!Arrays.ConstantTimeAreEqual(certID.GetCertHash(), hash))
{
throw new TspValidationException("certificate hash does not match certID hash.");
}
if (certID.IssuerSerial != null)
{
if (!certID.IssuerSerial.Serial.Value.Equals(cert.SerialNumber))
{
throw new TspValidationException("certificate serial number does not match certID for signature.");
}
GeneralName[] names = certID.IssuerSerial.Issuer.GetNames();
X509Name principal = PrincipalUtilities.GetIssuerX509Principal(cert);
bool found = false;
for (int i = 0; i != names.Length; i++)
{
if (names[i].TagNo == 4
&& X509Name.GetInstance(names[i].Name).Equivalent(principal))
{
found = true;
break;
}
}
if (!found)
{
throw new TspValidationException("certificate name does not match certID for signature. ");
}
}
TspUtil.ValidateCertificate(cert);
cert.CheckValidity(tstInfo.GenTime);
if (!tsaSignerInfo.Verify(cert))
{
throw new TspValidationException("signature not created by certificate.");
}
}
catch (CmsException e)
{
if (e.InnerException != null)
{
throw new TspException(e.Message, e.InnerException);
}
throw new TspException("CMS exception: " + e, e);
}
catch (CertificateEncodingException e)
{
throw new TspException("problem processing certificate: " + e, e);
}
catch (SecurityUtilityException e)
{
throw new TspException("cannot find algorithm: " + e.Message, e);
}
}
/**
* 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.");
}
}
}
}
/**
* Add a key agreement based recipient.
*
* @param agreementAlgorithm key agreement algorithm to use.
* @param senderPrivateKey private key to initialise sender side of agreement with.
* @param senderPublicKey sender public key to include with message.
* @param recipientCert recipient's public key certificate.
* @param cekWrapAlgorithm OID for key wrapping algorithm to use.
* @exception SecurityUtilityException if the algorithm requested cannot be found
* @exception InvalidKeyException if the keys are inappropriate for the algorithm specified
*/
public void AddKeyAgreementRecipient(
string agreementAlgorithm,
AsymmetricKeyParameter senderPrivateKey,
AsymmetricKeyParameter senderPublicKey,
X509Certificate recipientCert,
string cekWrapAlgorithm)
{
IList recipientCerts = Platform.CreateArrayList(1);
recipientCerts.Add(recipientCert);
AddKeyAgreementRecipients(agreementAlgorithm, senderPrivateKey, senderPublicKey,
recipientCerts, cekWrapAlgorithm);
}
/**
* add a recipient.
*
* @param cert recipient's public key certificate
* @exception ArgumentException if there is a problem with the certificate
*/
public void AddKeyTransRecipient(
X509Certificate cert)
{
KeyTransRecipientInfoGenerator ktrig = new KeyTransRecipientInfoGenerator();
ktrig.RecipientCert = cert;
recipientInfoGenerators.Add(ktrig);
}
/**
* Checks a distribution point for revocation information for the
* certificate <code>cert</code>.
*
* @param dp The distribution point to consider.
* @param paramsPKIX PKIX parameters.
* @param cert Certificate to check if it is revoked.
* @param validDate The date when the certificate revocation status should be
* checked.
* @param defaultCRLSignCert The issuer certificate of the certificate <code>cert</code>.
* @param defaultCRLSignKey The public key of the issuer certificate
* <code>defaultCRLSignCert</code>.
* @param certStatus The current certificate revocation status.
* @param reasonMask The reasons mask which is already checked.
* @param certPathCerts The certificates of the certification path.
* @throws AnnotatedException if the certificate is revoked or the status cannot be checked
* or some error occurs.
*/
private static void CheckCrl(
DistributionPoint dp,
PkixParameters paramsPKIX,
X509Certificate cert,
DateTime validDate,
X509Certificate defaultCRLSignCert,
AsymmetricKeyParameter defaultCRLSignKey,
CertStatus certStatus,
ReasonsMask reasonMask,
IList certPathCerts)
//throws AnnotatedException
{
DateTime currentDate = DateTime.UtcNow;
if (validDate.Ticks > currentDate.Ticks)
{
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, cert, 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, cert, defaultCRLSignCert, defaultCRLSignKey,
paramsPKIX, certPathCerts);
// (g)
AsymmetricKeyParameter key = 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, key);
}
/*
* 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 validity 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 (cert.NotAfter.Ticks < crl.ThisUpdate.Ticks)
{
throw new Exception("No valid CRL for current time found.");
}
}
Rfc3280CertPathUtilities.ProcessCrlB1(dp, cert, crl);
// (b) (2)
Rfc3280CertPathUtilities.ProcessCrlB2(dp, cert, crl);
// (c)
Rfc3280CertPathUtilities.ProcessCrlC(deltaCRL, crl, paramsPKIX);
// (i)
Rfc3280CertPathUtilities.ProcessCrlI(validDate, deltaCRL, cert, certStatus, paramsPKIX);
// (j)
Rfc3280CertPathUtilities.ProcessCrlJ(validDate, crl, cert, certStatus);
// (k)
if (certStatus.Status == CrlReason.RemoveFromCrl)
{
certStatus.Status = CertStatus.Unrevoked;
}
// update reasons mask
reasonMask.AddReasons(interimReasonsMask);
ISet criticalExtensions = crl.GetCriticalExtensionOids();
if (criticalExtensions != null)
{
criticalExtensions = new HashSet(criticalExtensions);
criticalExtensions.Remove(X509Extensions.IssuingDistributionPoint.Id);
criticalExtensions.Remove(X509Extensions.DeltaCrlIndicator.Id);
if (!criticalExtensions.IsEmpty)
throw new Exception("CRL contains unsupported critical extensions.");
}
if (deltaCRL != null)
{
criticalExtensions = deltaCRL.GetCriticalExtensionOids();
if (criticalExtensions != null)
{
criticalExtensions = new HashSet(criticalExtensions);
criticalExtensions.Remove(X509Extensions.IssuingDistributionPoint.Id);
criticalExtensions.Remove(X509Extensions.DeltaCrlIndicator.Id);
if (!criticalExtensions.IsEmpty)
throw new Exception("Delta CRL contains unsupported critical extension.");
}
}
validCrlFound = true;
}
catch (Exception e)
{
lastException = e;
}
}
if (!validCrlFound)
{
throw lastException;
}
}
/// <summary>
/// Creates an instance of <code>TrustAnchor</code> where the most-trusted
/// CA is specified as a distinguished name and public key. Name constraints
/// are an optional parameter, and are intended to be used as additional
/// constraints when validating an X.509 certification path.
/// <br/>
/// The name constraints are specified as a byte array. This byte array
/// contains the DER encoded form of the name constraints, as they would
/// appear in the NameConstraints structure defined in RFC 2459 and X.509.
/// </summary>
/// <param name="caName">the X.500 distinguished name of the most-trusted CA in RFC
/// 2253 string format</param>
/// <param name="pubKey">the public key of the most-trusted CA</param>
/// <param name="nameConstraints">a byte array containing the ASN.1 DER encoding of a
/// NameConstraints extension to be used for checking name
/// constraints. Only the value of the extension is included, not
/// the OID or criticality flag. Specify null to omit the
/// parameter.</param>
/// throws NullPointerException, IllegalArgumentException
public TrustAnchor(
string caName,
AsymmetricKeyParameter pubKey,
byte[] nameConstraints)
{
if (caName == null)
throw new ArgumentNullException("caName");
if (pubKey == null)
throw new ArgumentNullException("pubKey");
if (caName.Length == 0)
throw new ArgumentException("caName can not be an empty string");
this.caPrincipal = new X509Name(caName);
this.pubKey = pubKey;
this.caName = caName;
this.trustedCert = null;
setNameConstraints(nameConstraints);
}
internal static ISet[] ProcessCrlA1ii(
DateTime currentDate,
PkixParameters paramsPKIX,
X509Certificate cert,
X509Crl crl)
{
ISet deltaSet = new HashSet();
X509CrlStoreSelector crlselect = new X509CrlStoreSelector();
crlselect.CertificateChecking = cert;
try
{
IList issuer = Platform.CreateArrayList();
issuer.Add(crl.IssuerDN);
crlselect.Issuers = issuer;
}
catch (IOException e)
{
throw new Exception("Cannot extract issuer from CRL." + e, e);
}
crlselect.CompleteCrlEnabled = true;
ISet completeSet = CrlUtilities.FindCrls(crlselect, paramsPKIX, currentDate);
if (paramsPKIX.IsUseDeltasEnabled)
{
// get delta CRL(s)
try
{
deltaSet.AddAll(PkixCertPathValidatorUtilities.GetDeltaCrls(currentDate, paramsPKIX, crl));
}
catch (Exception e)
{
throw new Exception("Exception obtaining delta CRLs.", e);
}
}
return new ISet[]{ completeSet, deltaSet };
}
internal static ISet ProcessCrlA1i(
DateTime currentDate,
PkixParameters paramsPKIX,
X509Certificate cert,
X509Crl crl)
{
ISet deltaSet = new HashSet();
if (paramsPKIX.IsUseDeltasEnabled)
{
CrlDistPoint freshestCRL = null;
try
{
freshestCRL = CrlDistPoint.GetInstance(
PkixCertPathValidatorUtilities.GetExtensionValue(cert, X509Extensions.FreshestCrl));
}
catch (Exception e)
{
throw new Exception("Freshest CRL extension could not be decoded from certificate.", e);
}
if (freshestCRL == null)
{
try
{
freshestCRL = CrlDistPoint.GetInstance(PkixCertPathValidatorUtilities.GetExtensionValue(crl, X509Extensions.FreshestCrl));
}
catch (Exception e)
{
throw new Exception("Freshest CRL extension could not be decoded from CRL.", e);
}
}
if (freshestCRL != null)
{
try
{
PkixCertPathValidatorUtilities.AddAdditionalStoresFromCrlDistributionPoint(freshestCRL, paramsPKIX);
}
catch (Exception e)
{
throw new Exception(
"No new delta CRL locations could be added from Freshest CRL extension.", e);
}
// get delta CRL(s)
try
{
deltaSet.AddAll(PkixCertPathValidatorUtilities.GetDeltaCrls(currentDate, paramsPKIX, crl));
}
catch (Exception e)
{
throw new Exception("Exception obtaining delta CRLs.", e);
}
}
}
return deltaSet;
}
public OcspReq Generate(
string signingAlgorithm,
AsymmetricKeyParameter privateKey,
X509Certificate[] chain)
{
return Generate(signingAlgorithm, privateKey, chain, null);
}
public bool Match(
// Certificate cert)
X509Certificate x509Cert)
{
// if (!(cert is X509Certificate))
// {
// return false;
// }
//
// X509Certificate x509Cert = (X509Certificate)cert;
try
{
if (holder.BaseCertificateID != null)
{
return holder.BaseCertificateID.Serial.Value.Equals(x509Cert.SerialNumber)
&& MatchesDN(PrincipalUtilities.GetIssuerX509Principal(x509Cert), holder.BaseCertificateID.Issuer);
}
if (holder.EntityName != null)
{
if (MatchesDN(PrincipalUtilities.GetSubjectX509Principal(x509Cert), holder.EntityName))
{
return true;
}
}
if (holder.ObjectDigestInfo != null)
{
IDigest md = null;
try
{
md = DigestUtilities.GetDigest(DigestAlgorithm);
}
catch (Exception)
{
return false;
}
switch (DigestedObjectType)
{
case ObjectDigestInfo.PublicKey:
{
// TODO: DSA Dss-parms
//byte[] b = x509Cert.GetPublicKey().getEncoded();
// TODO Is this the right way to encode?
byte[] b = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(
x509Cert.GetPublicKey()).GetEncoded();
md.BlockUpdate(b, 0, b.Length);
break;
}
case ObjectDigestInfo.PublicKeyCert:
{
byte[] b = x509Cert.GetEncoded();
md.BlockUpdate(b, 0, b.Length);
break;
}
// TODO Default handler?
}
// TODO Shouldn't this be the other way around?
if (!Arrays.AreEqual(DigestUtilities.DoFinal(md), GetObjectDigest()))
{
return false;
}
}
}
catch (CertificateEncodingException)
{
return false;
}
return false;
}
internal static int WrapupCertA(
int explicitPolicy,
X509Certificate cert)
{
//
// (a)
//
if (!PkixCertPathValidatorUtilities.IsSelfIssued(cert) && (explicitPolicy != 0))
{
explicitPolicy--;
}
return explicitPolicy;
}
public X509Certificate[] GetCerts()
{
IList certs = GetCertList();
X509Certificate[] result = new X509Certificate[certs.Count];
for (int i = 0; i < certs.Count; ++i)
{
result[i] = (X509Certificate)certs[i];
}
return result;
}
/**
* Checks a certificate if it is revoked.
*
* @param paramsPKIX PKIX parameters.
* @param cert Certificate to check if it is revoked.
* @param validDate The date when the certificate revocation status should be
* checked.
* @param sign The issuer certificate of the certificate <code>cert</code>.
* @param workingPublicKey The public key of the issuer certificate <code>sign</code>.
* @param certPathCerts The certificates of the certification path.
* @throws AnnotatedException if the certificate is revoked or the status cannot be checked
* or some error occurs.
*/
protected static void CheckCrls(
PkixParameters paramsPKIX,
X509Certificate cert,
DateTime validDate,
X509Certificate sign,
AsymmetricKeyParameter workingPublicKey,
IList certPathCerts)
{
Exception lastException = null;
CrlDistPoint crldp = null;
try
{
crldp = CrlDistPoint.GetInstance(PkixCertPathValidatorUtilities.GetExtensionValue(cert, X509Extensions.CrlDistributionPoints));
}
catch (Exception e)
{
throw new Exception("CRL distribution point extension could not be read.", e);
}
try
{
PkixCertPathValidatorUtilities.AddAdditionalStoresFromCrlDistributionPoint(crldp, paramsPKIX);
}
catch (Exception e)
{
throw new Exception(
"No additional CRL locations could be decoded from CRL distribution point extension.", e);
}
CertStatus certStatus = new CertStatus();
ReasonsMask reasonsMask = new ReasonsMask();
bool validCrlFound = false;
// for each distribution point
if (crldp != null)
{
DistributionPoint[] dps = null;
try
{
dps = crldp.GetDistributionPoints();
}
catch (Exception e)
{
throw new Exception("Distribution points could not be read.", e);
}
if (dps != null)
{
for (int i = 0; i < dps.Length && certStatus.Status == CertStatus.Unrevoked && !reasonsMask.IsAllReasons; i++)
{
PkixParameters paramsPKIXClone = (PkixParameters)paramsPKIX.Clone();
try
{
CheckCrl(dps[i], paramsPKIXClone, cert, validDate, sign, workingPublicKey, certStatus, reasonsMask, certPathCerts);
validCrlFound = true;
}
catch (Exception e)
{
lastException = 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(cert.IssuerDN.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, paramsPKIXClone, cert, validDate, sign, workingPublicKey, certStatus, reasonsMask,
certPathCerts);
validCrlFound = true;
}
catch (Exception e)
{
lastException = e;
}
}
if (!validCrlFound)
{
throw 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 = "Certificate revocation after " + formattedDate;
message += ", reason: " + CrlReasons[certStatus.Status];
throw new Exception(message);
}
if (!reasonsMask.IsAllReasons && certStatus.Status == CertStatus.Unrevoked)
{
certStatus.Status = CertStatus.Undetermined;
}
if (certStatus.Status == CertStatus.Undetermined)
{
throw new Exception("Certificate status could not be determined.");
}
}