13: Creating Trust Between Organizations in Visual Studio .NET

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13: Creating Trust Between Organizations
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Determining Application Policy OIDs
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The following procedure obtains application policy OIDs in an Active Directory environment: 1. Open the Certificate Templates console (certtmpl.msc). 2. In the console tree, right-click Certificate Templates and click View Object Identifiers. 3. In the list of Available Object Identifiers, select the application policy OID you want to copy and click Copy Object Identifier. The OID is then copied to the Windows clipboard and can be pasted into the Policy.inf file.
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Defining Application Policies
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When you issue a Cross Certification Authority certificate, you can configure a Policy.inf file to specify which application policy OIDs are permitted in partner-issued certificates. Likewise, you can define a CAPolicy.inf file to specify which application policy OIDs are permitted in root certification authority certificates. To configure application policies in a Policy.inf or CAPolicy.inf file, create the following sections:
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[ApplicationPolicyStatementExtension] Policies = AppCodeSign, AppCTL, AppClientAuth CRITICAL = FALSE [AppCodeSign] OID = 11.3.6.1.5.5.7.3.3 ; Code Signing [AppCTL] OID = 1.3.6.1.4.1.311.10.3.1; Trust List Signing [AppClientAuth] OID = 1.3.6.1.5.5.7.3.2 ; Client Authentication
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Some organizations define their own application policy OIDs for custom applications. While most application policy OIDs are predefined and used universally, it might be necessary to define the mapping between your organization s application policy OID and a partner s application policy OID if custom application policies are defined.
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Establishing a PKI
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To define the mapping, you must create a section that maps your organization s application policy OID to a similar application policy OID at the partner organization. This mapping is defined in a [ApplicationPolicyMappingsExtension] section in the Policy.inf or CAPolicy.inf file, as shown here:
[ApplicationPolicyMappingsExtension] 1.3.6.1.4.1.311.21.64 = 1.2.3.4.98 1.3.6.1.4.1.311.21.65 = 1.2.3.4.100 critical = true
Enabling the criticality flag enforces that an application processing this extension must understand the contents of the extension or not trust the certificate that contains the extension. (For more information on the criticality flag, review the definitions of X.509 version 3 certificates in 2, Primer to PKI. )
Certificate Policies
Certificate policies, also known as issuance policies, can identify the methods taken to validate a subject s identity before certificate issuance. A certificate policy can also describe the protection level of the private key associated with a certificate. For example, a private key protected by a hardware security module (HSM) is considered more secure than one stored in the Local Machine store protected by the Data Protection Application Programming Interface (DPAPI). You can use qualified subordination to only accept certificates with specific certificate policy OIDs in the certificate policy extension.
Default Certificate Policies
When you deploy a Windows Server 2003 PKI in an Active Directory environment, the initial installation of the updated certificate templates creates four default certificate policies:
Low Assurance (1.3.6.1.4.1.311.21.8.a.b.c.1.400). Indicates that minimal effort is used to validate the certificate subject s identity. For example, the certificate can be issued if the requestor knows the user account s name and password. Medium Assurance (1.3.6.1.4.1.311.21.8.a.b.c.1.401). Indicates that some effort is used to identify the certificate s subject. For example, the pending certificate can require a certificate manager to approve the request. High Assurance (1.3.6.1.4.1.311.21.8.a.b.c.1.402). Indicates that additional measures are taken to identify the certificate s subject and protect the certificate s private key. For example, the same validation tests can be performed for both a medium and high assurance certificate, but a high assurance certificate s private key can be stored on a two-factor device, such as a smart card, while the medium assurance certificate s private key can be stored on the local disk subsystem.
13: Creating Trust Between Organizations
Note The definitions of the Low Assurance, Medium Assurance, and High Assurance certificate policies are just a recommendation. Your organization can define each certificate policy to meet its certificate policy requirements.
All Issuance (2.5.29.32.0). Allows the acceptance of any certificates that have any issuance policy OIDs. Typically, this OID is assigned only to certificates issued to CAs.
Note The a.b.c. portion of the OID is a randomly generated numeric sequence that is random for each forest with the Windows Server 2003 schema extensions.
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