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It wasn t too many versions or years ago that all the core database objects were stored in the SYS account The first departure occurred with SYSTEM, which was created specifically to address the object owner principle and to separate a user from the database objects At first, many objects were shared with SYS and SYSTEM, but over time, SYS retained sole ownership and SYSTEM became the intended DBA user account This allowed us to start controlling who has access to what, because SYSTEM required privileges to perform actions (although giving SYSTEM every possible privilege tends to defeat the intended goal) As Oracle introduced more options and capabilities, with the release of Oracle 73 there came a need and an obvious desire to create separate schemas in which to install these options Schemas such as MDSYS, which supports spatial data objects, and CTXSYS, which supports Oracle text objects, came to be These schemas were meant to serve as containers for the objects that made up the options (In this chapter, we ll refer to them as an option s schemas to differentiate them and note their intended role) In a similar manner to SYS, administrators and anyone with the correct password could log onto the option s schemas In addition, in combining the object owner principle of SYS and the need to grant many privileges such as SYSTEM, the option s schemas were sometimes considered to be superusers in their own right Other accounts of note quickly sprang up as well Large enterprise applications followed similar models of creating object container schemas with extreme privileges But this was not isolated to enterprise applications Many small- to medium-size applications also adopted this architecture There were good reasons for the apparent excessive privileges, which you will learn more about
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Today, lots of accounts can do lots of things: SYS and SYSTEM; every Oracle database option schema; enterprise resource planning (ERP) application schemas and user accounts; customer relationship management (CRM) application schemas and accounts; other back office enterprise application suites; and custom and other third-party software schemas and accounts There are a lot of schemas, and the implementations are fairly consistent, as described earlier It s worth repeating that the security ramifications are enormous All these accounts have login potential The object owner principle exists, but, more important, vast privileges often system *ANY privileges are in place This allows the schema or a user logged into that schema to do not only what is required for the application or option, but to do quite a bit more than what was originally intended
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Security specialists and best practice recommendations from folks such as the SANS Institute offer a consistent approach to dealing with these security problems: lock and expire the accounts Other suggestions, such as some made by the authors, have included varying technical Band-Aids such as setting impossible passwords, auditing logons, and sending alerts if someone accesses one of the special schemas The thinking is that you don t want people logging into these schemas because they are object owner intended schemas and not user accounts In many cases, new requests come in from the security or governance committee, asking if the schemas can be removed altogether In other cases, such as with the Java Virtual Machine (JVM), removal of the schema can occur, but this is often not a supportable configuration While the suggestions mentioned here are good security practices, they are still suboptimal
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To resolve the security issues, think about what you need to do to architect this properly You need to be able to partition schemas to avoid the object owner principle from cross-infecting your applications and data You also need a way to limit the privileges on those schemas to restrict them to their particular area of responsibility that is, users should have all privileges only within their application domain
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