ICertServerExit::GetCertificateExtensionFlags method (certif.h)

Article
10/13/2021

The GetCertificateExtensionFlags method gets the flags from the extension acquired by the most recent call to ICertServerExit::GetCertificateExtension.

Syntax

HRESULT GetCertificateExtensionFlags(
  [out] LONG *pExtFlags
);

Parameters

[out] pExtFlags

A pointer to a LONG variable that will contain the extension flags.

Return value

C++

If the method succeeds, the method returns S_OK, and *pExtFlags is set to the variable that contains the flags from the extension acquired by the most recent call to ICertServerExit::GetCertificateExtension.

If the method fails, it returns an HRESULT value that indicates the error. For a list of common error codes, see Common HRESULT Values.

VB

The return value is the flags from the extension acquired by the most recent call to ICertServerExit::GetCertificateExtension.

Remarks

There are two kinds of flags used in extensions: policy flags and origin flags.

Flag type	Explanation
Policy	Provides information about the certificate extension. Policy flags can be set by the policy module.
Origin	Indicates the module that set the certificate extension. Origin flags are only set by the server engine.

One or more policy flags can be returned from an extension. The following are predefined policy flags.

Policy flag value	Explanation
EXTENSION_CRITICAL_FLAG	This is a critical extension.
EXTENSION_DISABLE_FLAG	Extension will not be used.

One of the following origin flags can also be returned.

Origin flag value	Explanation
EXTENSION_ORIGIN_REQUEST	The extension was extracted from an array of extensions stored in the szOID_CERT_EXTENSIONS (1.3.6.1.4.1.311.2.1.14) or szOID_RSA_certExtensions (1.2.840.113549.1.9.14) attribute of a PKCS #10 request.
EXTENSION_ORIGIN_POLICY	The policy module set the extension.
EXTENSION_ORIGIN_ADMIN	The administrator set the extension. For more information, see ICertAdmin::SetCertificateExtension.
EXTENSION_ORIGIN_SERVER	The server engine set the extension.
EXTENSION_ORIGIN_RENEWALCERT	The extension was extracted from the certificate stored in the szOID_RENEWAL_CERTIFICATE (1.3.6.1.4.1.311.13.1) attribute of a PKCS #10 renewal request.
EXTENSION_ORIGIN_IMPORTEDCERT	The extension was extracted from an imported certificate (the certificate was passed to ICertAdmin::ImportCertificate).
EXTENSION_ORIGIN_PKCS7	The extension was extracted from an array of extensions stored in the szOID_CERT_EXTENSIONS (1.3.6.1.4.1.311.2.1.14) or szOID_RSA_certExtensions (1.2.840.113549.1.9.14) attribute of a PKCS #7 request.

Predefined masks are provided for ease of use in determining which flags are set in the return value. The following masks are provided.

Mask value	Explanation
EXTENSION_POLICY_MASK	This value (0x0000FFFF) is used to examine policy flags.
EXTENSION_ORIGIN_MASK	This value (0x000F0000) is used to examine origin flags.

It is safe to use the high 8 bits of EXTENSION_POLICY_MASK for custom data. These bits will be saved persistently in the database but will not be written to the certificate extensions.

You must call ICertServerExit::SetContext prior to using this method.

Examples

HRESULT  hr;
LONG     ExtFlags;

// pCertServerExit has been used to call SetContext previously.
hr = pCertServerExit->GetCertificateExtensionFlags(&ExtFlags);

// More than one policy flag may be set.
LONG ExtPolicyFlags = ExtFlags & EXTENSION_POLICY_MASK;

if (ExtPolicyFlags & EXTENSION_CRITICAL_FLAG)
{
    // Perform the desired operation.
}

if (ExtPolicyFlags & EXTENSION_DISABLE_FLAG)
{
    // Perform the desired operation.
}

// Only one origin flag can be set.
switch (ExtFlags & EXTENSION_ORIGIN_MASK)
{
    case EXTENSION_ORIGIN_REQUEST:
        // Extension was set in certificate request.
        break;
    case EXTENSION_ORIGIN_POLICY:
        // Extension was set by policy module.
        break;
    case EXTENSION_ORIGIN_ADMIN:
        // Extension was set by administrator.
        break;
    case EXTENSION_ORIGIN_SERVER:
        // Extension was set by server engine.
        break;
    case EXTENSION_ORIGIN_RENEWALCERT:
        // Extension was set by renewal certificate.
        break;
    case EXTENSION_ORIGIN_IMPORTEDCERT:
        // Extension was set by imported certificate.
        break;
    case EXTENSION_ORIGIN_PKCS7:
        // Extension was set by PKCS #7.
        break;
    default:
        break;
}

Requirements

Requirement	Value
Minimum supported client	None supported
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	certif.h (include Certsrv.h)
Library	Certidl.lib
DLL	Certcli.dll

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