ICertificatePolicy Interface


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Validates a server certificate.

Namespace:   System.Net
Assembly:  System (in System.dll)

public interface class ICertificatePolicy

The ICertificatePolicy interface is used to provide custom security certificate validation for an application. The default policy is to allow valid certificates, as well as valid certificates that have expired. To change this policy, implement the ICertificatePolicy interface with a different policy, and then assign that policy to ServicePointManager::CertificatePolicy.

ICertificatePolicy uses the Security Support Provider Interface (SSPI). For more information, see the SSPI documentation on MSDN.

The following example creates a certificate policy that returns false for any certificate problem and prints a message that indicates the problem on the console. The CertificateProblem enum defines SSPI constants for certificate problems, and the private GetProblemMessage method creates a printable message about the problem.

public enum class CertificateProblem : UInt32
   CertEXPIRED = 0x800B0101,
   CertROLE = 0x800B0103,
   CertPATHLENCONST = 0x800B0104,
   CertCRITICAL = 0x800B0105,
   CertPURPOSE = 0x800B0106,
   CertISSUERCHAINING = 0x800B0107,
   CertMALFORMED = 0x800B0108,
   CertUNTRUSTEDROOT = 0x800B0109,
   CertCHAINING = 0x800B010A,
   CertREVOKED = 0x800B010C,
   CertCN_NO_MATCH = 0x800B010F,
   CertWRONG_USAGE = 0x800B0110,
   CertUNTRUSTEDCA = 0x800B0112

public ref class MyCertificateValidation: public ICertificatePolicy

   // Default policy for certificate validation.
   static bool DefaultValidate = false;
   virtual bool CheckValidationResult( ServicePoint^ /*sp*/, X509Certificate^ /*cert*/, WebRequest^ request, int problem )
      bool ValidationResult = false;
      Console::WriteLine( "Certificate Problem with accessing {0}", request->RequestUri );
      Console::Write( "Problem code 0x{0:X8},", (int)problem );
      Console::WriteLine( GetProblemMessage( (CertificateProblem)problem ) );
      ValidationResult = DefaultValidate;
      return ValidationResult;

   String^ GetProblemMessage( CertificateProblem Problem )
      String^ ProblemMessage = "";
      CertificateProblem problemList = CertificateProblem(  );
      String^ ProblemCodeName = Enum::GetName( problemList.GetType(), Problem );
      if ( ProblemCodeName != nullptr )
            ProblemMessage = String::Concat( ProblemMessage, "-Certificateproblem:", ProblemCodeName );
            ProblemMessage = "Unknown Certificate Problem";

      return ProblemMessage;

.NET Framework
Available since 1.1
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