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Database Vault Introduction
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We ll start at the most elementary place, which for DBV is factors Think back to the discussion about multifactored and conditional security With conditional security, we are not making security decisions based on whether or not a person has the privilege to do something Security is more dynamic and can involve many factors that are checked at runtime and can be very extensible Multiple factors can be considered when you re deciding whether or not to enable a privilege or perform an action time of day, day of the week, how the user authenticated, whether the request was part of a specific transaction, and so forth Each, if not all, of those elements can be a factor in the overall security decision that is, the decision on whether or not to allow an action to take place, and the individual elements can be thought of as security factors NOTE For DBV, a factor is simply an item that you decide to use to make security decisions Factors are discrete security-related attributes that resolve to a specific value As you might guess, these factors are generally resolved using PL/SQL expressions Factors are like application context variables, but you don t have to develop any code to set, audit, and provide event handlers
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If you have ever employed SARs or written VPD policies with application context variables, you are quite familiar with the use of factors Everything from the user s identity, to a client identifier, to an IP address are factors that are commonly used to ensure that the security policies are being upheld With DBV, factors are declared, named, and stored in tables This allows factors to be reused, validated, and security enhanced Factor security is possible because the entire DBV infrastructure is secured One of the biggest risks to any security implementation is an attack on the logical implementation itself If you are using PL/SQL to protect your data, either as part of a SAR, a VPD, or even an API to prevent direct data access, what protects the PL/SQL Without DBV, nothing protects the security infrastructure other than standard security rights, which, as you have seen, are frequently overridden by system privileges DBV ensures that the things that are used to secure the database are also protected This is an important point: DBV significantly strengthens any security implementation It cannot be replicated using any other database mechanism NOTE DBV protects the things that protect the things
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If you ve written security code, you know that within your security policy or implementation, you construct a set of logical statements These statements are used to determine whether an action can or should take place Many statements take the form of Boolean logic that uses logical ANDs and ORs nested inside IF-THEN-ELSE statements You usually write code that says something analogous to if this and that, or the user is an administrator, then do choice one, else do choice two You could say that the security rule determines which choice will occur
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Part II:
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For a simple database example, consider the following logic checks to decide whether a user can SELECT from a table: The user authenticated using Secure Sockets Layer (SSL) The user s request comes from the application server s known IP address It is currently Monday through Friday The time is not between the hours of midnight and 6:00 AM The user is a member of the SALES_DEPARTMENT user group
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What you know about these checks is that each is a security factor In DBV, each will be represented as a factor that, when called, will return the value in a secure way We are taking the security factors and putting them together in a logical series of ANDs and ORs, which you could call your security rules DBV rules are the sequence of factors that you use to determine your security rules Our five security checks or the factors stated previously could be combined into a rule that is used to determine appropriate access privileges If all five factors are met, the rule may say, the action can be performed
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