private PkixCertPathBuilderResult Build(IX509AttributeCertificate attrCert, X509Certificate tbvCert, PkixBuilderParameters pkixParams, IList tbvPath)
{
if (tbvPath.Contains(tbvCert))
{
return(null);
}
if (pkixParams.GetExcludedCerts().Contains(tbvCert))
{
return(null);
}
if (pkixParams.MaxPathLength != -1 && tbvPath.Count - 1 > pkixParams.MaxPathLength)
{
return(null);
}
tbvPath.Add(tbvCert);
PkixCertPathBuilderResult pkixCertPathBuilderResult = null;
PkixAttrCertPathValidator pkixAttrCertPathValidator = new PkixAttrCertPathValidator();
try
{
if (PkixCertPathValidatorUtilities.FindTrustAnchor(tbvCert, pkixParams.GetTrustAnchors()) != null)
{
PkixCertPath certPath = new PkixCertPath(tbvPath);
PkixCertPathValidatorResult pkixCertPathValidatorResult;
try
{
pkixCertPathValidatorResult = pkixAttrCertPathValidator.Validate(certPath, pkixParams);
}
catch (Exception innerException)
{
throw new Exception("Certification path could not be validated.", innerException);
}
return(new PkixCertPathBuilderResult(certPath, pkixCertPathValidatorResult.TrustAnchor, pkixCertPathValidatorResult.PolicyTree, pkixCertPathValidatorResult.SubjectPublicKey));
}
try
{
PkixCertPathValidatorUtilities.AddAdditionalStoresFromAltNames(tbvCert, pkixParams);
}
catch (CertificateParsingException innerException2)
{
throw new Exception("No additional X.509 stores can be added from certificate locations.", innerException2);
}
ISet set = new HashSet();
try
{
set.AddAll(PkixCertPathValidatorUtilities.FindIssuerCerts(tbvCert, pkixParams));
}
catch (Exception innerException3)
{
throw new Exception("Cannot find issuer certificate for certificate in certification path.", innerException3);
}
if (set.IsEmpty)
{
throw new Exception("No issuer certificate for certificate in certification path found.");
}
foreach (X509Certificate x509Certificate in set)
{
if (!PkixCertPathValidatorUtilities.IsSelfIssued(x509Certificate))
{
pkixCertPathBuilderResult = this.Build(attrCert, x509Certificate, pkixParams, tbvPath);
if (pkixCertPathBuilderResult != null)
{
break;
}
}
}
}
catch (Exception innerException4)
{
this.certPathException = new Exception("No valid certification path could be build.", innerException4);
}
if (pkixCertPathBuilderResult == null)
{
tbvPath.Remove(tbvCert);
}
return(pkixCertPathBuilderResult);
}
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;
}
protected virtual PkixCertPathBuilderResult Build(
X509Certificate tbvCert,
PkixBuilderParameters pkixParams,
IList tbvPath)
{
// If tbvCert is readily present in tbvPath, it indicates having run
// into a cycle in the PKI graph.
if (tbvPath.Contains(tbvCert))
{
return(null);
}
// step out, the certificate is not allowed to appear in a certification
// chain.
if (pkixParams.GetExcludedCerts().Contains(tbvCert))
{
return(null);
}
// test if certificate path exceeds maximum length
if (pkixParams.MaxPathLength != -1)
{
if (tbvPath.Count - 1 > pkixParams.MaxPathLength)
{
return(null);
}
}
tbvPath.Add(tbvCert);
X509CertificateParser certParser = new X509CertificateParser();
PkixCertPathBuilderResult builderResult = null;
PkixCertPathValidator validator = new PkixCertPathValidator();
try
{
// check whether the issuer of <tbvCert> is a TrustAnchor
if (PkixCertPathValidatorUtilities.FindTrustAnchor(tbvCert, pkixParams.GetTrustAnchors()) != null)
{
// exception message from possibly later tried certification
// chains
PkixCertPath certPath = null;
try
{
certPath = new PkixCertPath(tbvPath);
}
catch (Exception e)
{
throw new Exception(
"Certification path could not be constructed from certificate list.",
e);
}
PkixCertPathValidatorResult result = null;
try
{
result = (PkixCertPathValidatorResult)validator.Validate(
certPath, pkixParams);
}
catch (Exception e)
{
throw new Exception(
"Certification path could not be validated.", e);
}
return(new PkixCertPathBuilderResult(certPath, result.TrustAnchor,
result.PolicyTree, result.SubjectPublicKey));
}
else
{
// add additional X.509 stores from locations in certificate
try
{
PkixCertPathValidatorUtilities.AddAdditionalStoresFromAltNames(
tbvCert, pkixParams);
}
catch (CertificateParsingException e)
{
throw new Exception(
"No additiontal X.509 stores can be added from certificate locations.",
e);
}
// try to get the issuer certificate from one of the stores
HashSet issuers = new HashSet();
try
{
issuers.AddAll(PkixCertPathValidatorUtilities.FindIssuerCerts(tbvCert, pkixParams));
}
catch (Exception e)
{
throw new Exception(
"Cannot find issuer certificate for certificate in certification path.",
e);
}
if (issuers.IsEmpty)
{
throw new Exception("No issuer certificate for certificate in certification path found.");
}
foreach (X509Certificate issuer in issuers)
{
builderResult = Build(issuer, pkixParams, tbvPath);
if (builderResult != null)
{
break;
}
}
}
}
catch (Exception e)
{
certPathException = e;
}
if (builderResult == null)
{
tbvPath.Remove(tbvCert);
}
return(builderResult);
}
private PkixCertPathBuilderResult Build(IX509AttributeCertificate attrCert, X509Certificate tbvCert, PkixBuilderParameters pkixParams, global::System.Collections.IList tbvPath)
{
if (tbvPath.Contains((object)tbvCert))
{
return(null);
}
if (pkixParams.GetExcludedCerts().Contains(tbvCert))
{
return(null);
}
if (pkixParams.MaxPathLength != -1 && ((global::System.Collections.ICollection)tbvPath).get_Count() - 1 > pkixParams.MaxPathLength)
{
return(null);
}
tbvPath.Add((object)tbvCert);
PkixCertPathBuilderResult pkixCertPathBuilderResult = null;
PkixAttrCertPathValidator pkixAttrCertPathValidator = new PkixAttrCertPathValidator();
try
{
if (PkixCertPathValidatorUtilities.FindTrustAnchor(tbvCert, pkixParams.GetTrustAnchors()) != null)
{
PkixCertPath certPath = new PkixCertPath((global::System.Collections.ICollection)tbvPath);
PkixCertPathValidatorResult pkixCertPathValidatorResult;
try
{
pkixCertPathValidatorResult = pkixAttrCertPathValidator.Validate(certPath, pkixParams);
}
catch (global::System.Exception ex)
{
throw new global::System.Exception("Certification path could not be validated.", ex);
}
return(new PkixCertPathBuilderResult(certPath, pkixCertPathValidatorResult.TrustAnchor, pkixCertPathValidatorResult.PolicyTree, pkixCertPathValidatorResult.SubjectPublicKey));
}
try
{
PkixCertPathValidatorUtilities.AddAdditionalStoresFromAltNames(tbvCert, pkixParams);
}
catch (CertificateParsingException ex2)
{
throw new global::System.Exception("No additional X.509 stores can be added from certificate locations.", (global::System.Exception)ex2);
}
ISet set = new HashSet();
try
{
set.AddAll((global::System.Collections.IEnumerable)PkixCertPathValidatorUtilities.FindIssuerCerts(tbvCert, pkixParams));
}
catch (global::System.Exception ex3)
{
throw new global::System.Exception("Cannot find issuer certificate for certificate in certification path.", ex3);
}
if (set.IsEmpty)
{
throw new global::System.Exception("No issuer certificate for certificate in certification path found.");
}
global::System.Collections.IEnumerator enumerator = ((global::System.Collections.IEnumerable)set).GetEnumerator();
try
{
while (enumerator.MoveNext())
{
X509Certificate x509Certificate = (X509Certificate)enumerator.get_Current();
if (!PkixCertPathValidatorUtilities.IsSelfIssued(x509Certificate))
{
pkixCertPathBuilderResult = Build(attrCert, x509Certificate, pkixParams, tbvPath);
if (pkixCertPathBuilderResult != null)
{
break;
}
}
}
}
finally
{
global::System.IDisposable disposable = enumerator as global::System.IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
}
catch (global::System.Exception ex4)
{
certPathException = new global::System.Exception("No valid certification path could be build.", ex4);
}
if (pkixCertPathBuilderResult == null)
{
tbvPath.Remove((object)tbvCert);
}
return(pkixCertPathBuilderResult);
}
