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The default value for the OS_AUTHENT_PREFIX parameter is "OPS$", but that is only for maintaining backward compatibility.
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When you start the database again, you can start using external authentication based on the underlying operating system. To enable operating system authentication, this is how you need to create your users: SQL> CREATE USER salapati IDENTIFIED EXTERNALLY; User created. SQL> Note that the new user isn t given a password the user doesn t need one. As long as the user can log into the operating system, all he or she will have to do is type the following command to log into the database: $ sqlplus /
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CHAPTER 12 US ER MA NAG EMENT A ND DA TABA SE S ECUR ITY
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Note The well-known Oracle OPS$ORACLE database account is a simple variation on the preceding example of external authentication. OPS$ is a prefix Oracle has used since the Oracle 5 version. You can use any prefix or no prefix at all for operating system external authentication.
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The external operating system authentication described in this section doesn t allow users to connect over Oracle Net, because that authentication method isn t considered very secure. Therefore, shared server configurations that use Oracle Net can t, by default, use operating system external authentication. To override this default behavior, you have to set the following parameter in your init.ora file: REMOTE_OS_AUTHENT=TRUE
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You can use proxy authentication to allow a single, persistent database session to switch identity to other users without having to logon/logoff all the time. You can use several middle-tier products to facilitate user interaction with the Oracle database. A web server is often used as the middle or application layer connecting the clients to the database. You can choose to have the middle tier authenticate your users, or you can have the middle tier pass the username and password to the database for authentication. Here is an example showing how to authorize connections by a database user logging on from a middle-tier node, using password authentication. SQL> 2 3* User SQL> ALTER USER salapati GRANT CONNECT THROUGH appserv AUTHENTICATED USING PASSWORD; altered.
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The following example shows how you can allow a persistent session logged on as appserv to take on temporarily the identity of salapati, if the persistent session provides user salapati s password. SQL> ALTER USER salapati 2* GRANT CONNECT THROUGH appserv; User altered. SQL>
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If you use the Oracle Advanced Security option, you can use a Lightweight Directory Access Protocol (LDAP) based directory service, such as Oracle Internet Directory (OID), to perform user authentication. The directory-based service lets you create enterprise users who can be granted global roles. Centralized user management enables the use of a single sign-on that is, users need only sign in once to access all the databases they need to use. Because Oracle Advanced Security isn t used by every database, I don t provide a detailed explanation of the implementation of centralized user authorization. Please refer to the Oracle manual Oracle Advanced Security Administrator s Guide, available on the http://tahiti.oracle.com web site, for a detailed explanation of this feature.
CHAPT ER 12 USE R MA NAGEM ENT AN D DA TA BAS E S ECURITY
Enterprise User Security
Large organizations these days have both internal and Web-based applications to manage. It quickly becomes an administrative nightmare to manage users and their privileges on all these different applications. Centralized directories are increasingly being seen as the best way to manage multiple systems within an organization. LDAP is a popular industry standard, and Oracle has its own implementation of it. Information that has been managed in multiple systems and formats can be brought under one umbrella using a directory service like LDAP. You can replace all your tnsnames.ora files on clients and manage user connectivity, authorization, and security with the help of the LDAP directory services. The LDAP directory can provide solid password policy management, data privacy, data integrity, and strong authentication and authorization protocols.
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