SIDStatements

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[edit] Security ID (SID) Statement

There are two SID statements, the first one declares the actual SID identifier and is defined at the start of a policy source file. The second statement is used to associate an initial security context to the SID, this is used when SELinux initialises but the policy has not yet been activated or as a default context should an object have an invalid label.

[edit] sid

The sid statement declares the SID identifier and is defined at the start of a policy source file.

The statement definition is:

sid sid_id

Where:

sid The sid keyword.
sid_id The sid identifier.


The statement is valid in:

Monolithic Policy
Base Policy
Module Policy
Yes
Yes
No
if Statement
optional Statement
require Statement
No
No
No


Example:

This example has been taken from the Reference Policy source ./policy/flask/initial_sids file.

sid kernel
sid security
sid unlabeled
sid fs


[edit] sid context

The sid context statement is used to associate an initial security context to the SID.

sid sid_id context

Where:

sid The sid keyword.
sid_id The previously declared sid identifier.
context The initial security context.


The statements are valid in:

Monolithic Policy
Base Policy
Module Policy
Yes
Yes
No
if Statement
optional Statement
require Statement
No
No
No


Examples:

# This is from a targeted policy:

sid unlabeled
...

sid unlabeled system_u:object_r:unlabeled_t
# This is from an MLS policy. Note that the security level is set
# to SystemHigh as it may need to label any object in the system.

sid unlabeled
...

sid unlabeled system_u:object_r:unlabeled_t:s15:c0.c255 


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