mlsfiledowngrade = used by mlsvalidatetrans to constrain file security context transitions.mlsfileupgrade = used by mlsvalidatetrans to constrain file security context transitions.mlsfilereadtoclr = clr means clearance, i.e.
#SHOW THE DOM RELATIONSHIP FOR MAC AND THE ACCESS MATRIX FOR DAC FULL#
dom = dominates (equal to or greater than)Įxpression type constants (for the full list see: refpolicy/policy/modules/kernel/mls.if).t = type (not to be confused with an SELinux context type this type is actually an attribute associated with a role to provide SELinux users mapped to that role with special permissions – i.e.3 = the subject’s context (only used with mlsvalidatetrans).2 = the object (except when used with mlsvalidatetrans, where it means the object’s new context).1 = the subject (except when used with mlsvalidatetrans, where it means the object’s current context).Where: name is either mlsconstrain or mlsvalidatetrans classes are types of objects the constraint applies to, which are defined by the source file: refpolicy/policy/flask/security_classes modes are actions that can be performed and are defined by the source file: refpolicy/policy/flask/access_vectors the expression is a boolean expression stating the relationship between the subject and objects’ security context’s properties. (( t1 = mlsfiledowngrade ) and ( l1 incomp h2 )))) (( t1 = mlsfiledowngrade ) and ( l1 dom h2 )) or (( t1 = mlsfileupgrade ) and ( l1 domby h2 )) or (( t1 = mlsfiledowngrade ) and ( l1 incomp l2 ))) and (( t1 = mlsfiledowngrade ) and ( l1 dom l2 )) or (( t1 = mlsfileupgrade ) and ( l1 domby l2 )) or # make sure these file classes are “single level”
secmark and peer controls (multi-level network traffic).file (files and directories with a single sensitivity, i.e.‘s peer-reviewed 2010 paper, ‘ A logical specification and analysis for SELinux MLS policy‘.Īs of this writing, the current refpolicy mls file has in it 32 classes (groups of constraints), including but not limited to: not including trusted objects) have been formally proven to hold Bell-LaPadula’s ‘no read up, no write down’ information-flow properties by Hicks, et. The mls policy’s single-sensitivity constraints (i.e.
A second type of boolean expression exists (mlsvalidatetrans), which is used specifically to the allow the upgrading/downgrading of objects (files and databases). The mls policy file (refpolicy/policy/mls) is organised into groups or classes of ‘mlsconstrain’ boolean expressions that allow certain ‘modes’ ( access vectors) based on the relationship between the subject and object being evaluated and their respective contexts keep in mind that the default policy behaviour is to deny an action unless permitted by one of the ‘mlsconstrain’ boolean expressions. Tresys’ SELinux reference policy (refpolicy) is the basis of EL 6’s built-in SELinux policies, including the mls policy discussed here. To better understand what restrictions the mls policy places on the system and its users, where better to look than the policy source? I would recommend reading my previous posts first, as the issues discussed here rely heavily on concepts already expounded.
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