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    SubjectRe: [PATCH] Smack: Simplified Mandatory Access Control Kernel
    Date
    Casey Schaufler (on Sat, 11 Aug 2007 10:57:31 -0700) wrote:
    >Smack is the Simplified Mandatory Access Control Kernel.
    >
    > [snip]
    >
    >Smack defines and uses these labels:
    >
    > "*" - pronounced "star"
    > "_" - pronounced "floor"
    > "^" - pronounced "hat"
    > "?" - pronounced "huh"
    >
    >The access rules enforced by Smack are, in order:
    >
    >1. Any access requested by a task labeled "*" is denied.
    >2. A read or execute access requested by a task labeled "^"
    > is permitted.
    >3. A read or execute access requested on an object labeled "_"
    > is permitted.
    >4. Any access requested on an object labeled "*" is permitted.
    >5. Any access requested by a task on an object with the same
    > label is permitted.
    >6. Any access requested that is explicitly defined in the loaded
    > rule set is permitted.
    >7. Any other access is denied.

    Some security systems that have the concept of "no default access"
    (task labeled "*") also allow access by those tasks but only if there
    is an explicit rule giving access to the task. IOW, rule 6 is applied
    before rule 1. In my experience this simplifies special cases where a
    task should only have access to a very small set of resources. I'm
    curious why smack goes the other way?

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