Authorization Workflow for Message Queueing Platform

[Joshua Kramer <josh@globalherald.net>]

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Hello,

In considering the authorization workflow for a message queueing 
platform - specifically, apache qpid - I came up with the following.  
Please let me know how I can improve this.

Thanks,
-Josh

 I.Definitions
 A.In this narrative, "this Subject" means the process connecting to qpid.
 II.Determine the Action.
 A.If ACT_CREATE, ACT_DELETE:
 i.Determine the object type.  If OBJ_QUEUE, determine if it is a 
server-side or client-side queue.
 ii.Determine if the Context of this Subject permits to CREATE or DELETE 
Objects in the parent Object?  (i.e. are we allowed to create queues  in 
this broker?)
 a)Determine this by searching the SELinux context list first by finding 
the map corresponding to object_type, then the map corresponding to the 
parent's name. TODO: how do we determine the parent from this object as 
passed in the Acl::authorise call?)
 b)If this is not permitted, deny and return.
 iii.If command is create and Context does permit object creation:
 a)If this is OBJ_QUEUE
Does the Context of this Subject permit it to CREATE or DELETE queues of 
the type noted in i above?  TODO: how do we represent "permitted to 
create server queue" and "permitted to create client queue" in the 
SELinux context list?
If Context does permit creation:
Add an item in the SELinux context list for this object.
Inherit this Object's context from the parent, OR
Label according to the arguments passed in on the create call.
Create the Object
Return control
Otherwise deny creation of object.
 b)If this is an OBJ_EXCHANGE,
Add an item in the SELinux context list for this object.
Inherit this Object's context from the parent, OR
Label according to the arguments passed in on the create call.
Create the Exchange.
 iv.If command is delete and Context does permit object deletion:
Delete object as specified by method call.
Delete object's reference in the SELinux context list.
 B.If ACT_CONSUME, ACT_PUBLISH, ACT_ACCESS, ACT_BIND, ACT_UNBIND,  
ACT_DELETE, ACT_PURGE, ACT_UPDATE:
 i.Determine if the Context of this Subject permits the noted action on 
the target Object:
 a)Search the map of object types; when the target Object's Type is found,
 b)Search the resulting map for this Object's ID.
 c)Call security_compute_av to determine if this Subject is permitted to 
access the target Object with the Subject's context.
 ii.If Yes: Allow
 iii.If No: Deny


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