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Netscape Directory Server 41 and later versions implement the control, and the control is supported in the SDK If a request containing a proxied authorization control is received, the server checks if the requester has proxy access rights within the subtree speci ed for the operation (for example, the base DN for a search, or the DN for a modify operation) An ACI granting this right looks like this:
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aci: (targetattr = "*")(version 30; acl "Proxy rights for admin"; allow ( proxy) userdn = "ldap:///uid=admin, o=acmecom";)
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Unless proxy rights have been granted to anonymous users (not a good idea!), the connection must have already been authenticated at that point If the requester has proxy rights, the server evaluates access control for the operation as if it were requested by the DN in the control For example:
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LDAPConnection ld = new LDAPConnection(); try { // Connect to server ldconnect( 3, hostname, portnumber, "uid=admin,o=acmecom", "password" ); // Create a "critical" proxied auth server control using // the DN "uid=charlie,ou=people,o=acmecom" LDAPProxiedAuthControl ctrl = new LDAPProxiedAuthControl( "uid=charlie,ou=people,o=acmecom", true ); // Create search constraints to use that control LDAPSearchConstraints cons = ldgetSearchConstraints(); conssetServerControls( ctrl ); // Send the search request LDAPSearchResults res = ldsearch( "ou=people,o=acmecom", ldSCOPE_SUB, "(cn=Barbara*)", null, false, cons );
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The search will be executed as uid=charlie if the DN uid=admin,o=acmecom has proxy rights for the subtree ou=people,o=acmecom If not, an LDAPException is thrown with the error code INSUFFICIENT_ACCESS_RIGHTS You might wonder, How does the application know that the user really is uid=charlie if it doesn t attempt to authenticate as uid=charlie The authentica-
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Controls: An Essential Extension 561
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tion is assumed to have taken place earlier or outside of this code (for example, by a Web server), and does not need to be done here One very important example in which this is the case is server applications that accept SSL client authentication The server-side code (for example, a servlet running on a Web server that can do SSL authentication against a directory) is noti ed that the client has successfully completed SSL client authentication The servlet then checks the DN for which the authentication was negotiated (available through the servlet API) and uses the DN in a proxied authorization control for all operations on behalf of the user Proxied authorization works very well in server-side programming also when certi cates are not involved Most server applications execute user requests as the identity of the user A Web server may prompt the user for a user ID and password on attempting to enter a Web page, and authenticate the user against a directory A servlet or other Web server hosted service can nd out the DN the user was authenticated as, but not the password, for security reasons For the servlet to perform an operation with the identity of the user, it must reprompt for the password so that it can authenticate as the user to the directory With proxied authorization, however, the servlet maintains its own authenticated connection but requests the operation to be performed on behalf of the user requesting it, using the DN it received from the Web server
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Your Very Own Controls: Using the BER Package
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We mentioned earlier that most controls that are not proprietary to one company use Basic Encoding Rules to encode any data The SDK includes a complete package for encoding and decoding data types that are used in LDAP: netscapeldapstreamber The BER package is not described in the general SDK documentation, and it is not covered by the Internet Drafts on the Java LDAP API
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Let s start by looking at how a VLV request control is constructed All controls extend LDAPControl, which provides common methods and support, and de ne a unique OID The OID is passed to the superclass constructor in any local constructors:
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public class LDAPVirtualListControl extends LDAPControl { public final static String VIRTUALLIST = "2168401113730349"; public LDAPVirtualListControl( String jumpTo, int beforeCount, int afterCount ) { super( VIRTUALLIST, true, null ); setRange( jumpTo, beforeCount, afterCount ); }
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