SIDStatements

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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 add an initial security context to the SID that is used when SELinux initialises or as a default if an object is not labeled correctly. The Building a Basic Policy section shows their usage.

sid Statement

The sid statement declares the actual 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. Note that there is no terminating ';'.


The statement is valid in:

Monolithic Policy
Base Policy
Module Policy
Yes
Yes
No
Conditional Policy (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.

# This example was taken from the
# ./policy/flask/initial_sids file and declares some 
# of the initial SIDs:
#

sid kernel
sid security
sid unlabeled
sid fs

sid context Statement

The sid context statement is used to add an initial security context to the SID that is used when SELinux initialises, or as a default if an object is not labeled correctly.

sid sid_id context

Where:

sid The sid keyword.
sid_id The previously declared sid identifier.
context The initial security context associated with the SID. Note that there is no terminating ';'.


The statements are valid in:

Monolithic Policy
Base Policy
Module Policy
Yes
Yes
No
Conditional Policy (if) Statement
optional Statement
require Statement
No
No
No


Examples:

# These statements add an initial security context to an object 
# that is used when SELinux initialises or as a default if a
# context is not available or labeled incorrectly. 
#
# This one is from a targeted policy:

sid unlabeled system_u:object_r:unlabeled_t

# This one 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 system_u:object_r:unlabeled_t:s15:c0.c255 
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