Name Constraints in .NET

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Name Constraints
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Name constraints define the namespaces that are allowed or disallowed in certificates issued by CAs subordinate to the CA that issues the Cross Certification Authority certificate. For example, if you want to implement name constraints on a CA owned by A Datum Corporation, you can define allowed namespaces for all forms of the Adatum.msft domain used in certificates you wish to recognize. This can include the following formats:
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DirectoryName = DC=Adatum,DC=msft E-mail = @adatum.msft UPN = .adatum.msft UPN = @adatum.msft
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Note You must define each name format that can be used in a certificate issued by the partner organization. Omission of one of the name formats leads to certificate rejection, even if it should pass the defined name constraints. You can turn off the default behavior for name constraint validation for Windows Ser ver 2003 and Windows XP SP2 by defining the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\SystemCertificates \Root\ProtectedRoots registry key to a value of 0x20 to disable name constraint enforcement for undefined name types.
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Processing Name Constraints
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When name constraints are defined, you can define both permitted and excluded namespaces. The following processing rules are used when multiple namespaces are defined:
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A certificate is accepted if all names in the certificate match the corresponding permitted name constraints. A certificate is rejected if any names in the certificate request match are excluded name constraints. If a namespace is defined in both a permitted and an excluded name constraint, the excluded name constraint takes precedence. If name constraints only define excluded namespaces, then all other namespaces are implicitly permitted. If name constraints only define permitted namespaces, then all other namespaces are implicitly excluded. Name constraints are applied to the Subject field and any existing Subject Alternative Name extensions.
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Name Formats
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Many name formats are allowed when defining name constraints for qualified subordination. Name formats can include:
Relative distinguished name. Identifies the names of objects stored in directories, such as Active Directory. The following entries are examples of relative distinguished names:
DirectoryName="DC=nwtraders,DC=msft". Includes all objects in the nwtraders.msft domain. DirectoryName="OU=Marketing,DC=nwtraders,DC=msft". Includes all objects within the Marketing OU structure.
DNS name. Identifies the Domain Name System (DNS) name of a computer or network device. This constraint is used for the evaluation of computer certificates only, as users are not assigned DNS names. The following entries are examples of relative distinguished names:
DNS=www.nwtraders.msft. host, www.nwtraders.msft.
Limits the DNS namespace to a single
DNS=.nwtraders.msft. Limits the DNS namespace to all hosts within the nwtraders.msft DNS domain. This includes www.nwtraders.msft and dc1.east.nwtraders.msft, as both names end with nwtraders.msft.
13: Creating Trust Between Organizations
Uniform Resource Identifier (URI). Identifies resources on the Internet that use protocol identifiers such as Uniform Resource Locator (URL), File Transfer Protocol (FTP), and Hypertext Transfer Protocol (HTTP). The following entries are examples of URI names:
URL=http://www.nwtraders.msft. Limits the acceptable certificates to only www.nwtraders.msft using HTTP. URL=ftp://.nwtraders.msft. Limits the namespace to all hosts within the nwtraders.msft DNS domain using FTP.
Email name. Identifies acceptable email names in a certificate s subject or Subject Alternative Name extension. The following entries are examples of email names:
Email=@nwtraders.msft. Matches any e-mail address that is part of the nwtraders.msft namespace. Email=.nwtraders.msft. Matches any e-mail address that is part of the nwtraders.msft namespace. Email=komar@nwtraders.msft. Matches any e-mail address that contains komar@nwtraders.msft. This matches both komar@nwtraders.msft and bkomar@nwtraders.msft.
User Principal Name (UPN). Like the email name, the UPN constraint defines the acceptable UPNs within the certificate s Subject Alternative Name extension. UPN formats are the same as the name formats for e-mail addresses. The following entries are examples of UPNs:
UPN=@nwtraders.msft. .msft.
Matches any UPN with the suffix of @nwtraders
UPN=.nwtraders.msft. Matches any UPN with the suffix of nwtraders.msft, including east.nwtraders.msft and west.nwtraders.msft.
IP address. Identifies the IP address of a computer or network device. This constraint allows you to choose either specific IP addresses or ranges of IP addresses. The following entries are examples of IP addresses:
IPADDRESS=192.168.3.0/255.255.255.0. Matches any IP address in the 192.168.3.0 network, which encompasses IP addresses 192.168.3.0 through 192.168.1.255 IPADDRESS=192.168.2.244/255.255.255.255. address, 192.168.2.244. Matches a specific IP
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