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CADC User Authorization Model
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<h1>CADC User Authorization Model</h1>
<p>The CADC User Authorization Model is a model for representing CADC users and groups. The model is used primarily in the GMS and Users Web services.
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<a href="uml/UserAuth.png"> <img src="uml/UserAuth.png" alt="CADC User Authorization Model"></a>
<h2>User Class Features </h2>
In the system, a user is uniquely identified by a Principal (in CADC's case that is the CadcPrincipal) but can have a number of other identities for different contexts:
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<li>HttpPrincipal: Web user identity associated with Simple HHTP User Password access.</li>
<li>X500Principal: X509 certificate identity. </li>
<li>SShPubKeyPrincipal: An ssh key identity. </li>
<li>CadcPrincipal: An identity used internally at the CADC. </li>
<li>CookiePrincipal: Cookie based identity. </li>
<li>OpenIdPrincipal: An OpenID identity. </li>
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<h2>Group Class Features</h2>
Groups represet associations of users. Members of groups can be groups of users or simple users. groupWrite and groupRead represent the groups that have read and read-and-write permissions to the current group.
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