|
OSGi™ Service Platform Release 2 |
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
A named grouping of roles (Role objects).
Whether or not a given Authorization context implies a Group object depends on the members of that Group object.
A Group object can have two kinds of members: basic and required. A Group object is implied by an Authorization context if all of its required members are implied and at least one of its basic members is implied.
A Group object must contain at least one basic member in order to be implied. In other words, a Group object without any basic member roles is never implied by any Authorization context.
A User object always implies itself.
No loop detection is performed when adding members to Group objects, which means that it is possible to create circular implications. Loop detection is instead done when roles are checked. The semantics is that if a role depends on itself (i.e., there is an implication loop), the role is not implied.
The rule that a Group object must have at least one basic member to be implied is motivated by the following example:
group foo required members: marketing basic members: alice, bobPrivileged operations that require membership in "foo" can be performed only by "alice" and "bob", who are in marketing.
If "alice" and "bob" ever transfer to a different department, anybody in marketing will be able to assume the "foo" role, which certainly must be prevented. Requiring that "foo" (or any Group object for that matter) must have at least one basic member accomplishes that.
However, this would make it impossible for a Group object to be implied by just its required members. An example where this implication might be useful is the following declaration: "Any citizen who is an adult is allowed to vote." An intuitive configuration of "voter" would be:
group voter required members: citizen, adult basic members:However, according to the above rule, the "voter" role could never be assumed by anybody, since it lacks any basic members. In order to address this issue a predefined role named "user.anyone" can be specified, which is always implied. The desired implication of the "voter" group can then be achieved by specifying "user.anyone" as its basic member, as follows:
group voter required members: citizen, adult basic members: user.anyone
Field Summary |
Fields inherited from interface org.osgi.service.useradmin.Role |
GROUP, ROLE, USER |
Method Summary | |
boolean |
addMember(Role role)
Adds the specified Role object as a basic member to this Group object. |
boolean |
addRequiredMember(Role role)
Adds the specified Role object as a required member to this Group object. |
Role[] |
getMembers()
Gets the basic members of this Group object. |
Role[] |
getRequiredMembers()
Gets the required members of this Group object. |
boolean |
removeMember(Role role)
Removes the specified Role object from this Group object. |
Methods inherited from interface org.osgi.service.useradmin.User |
getCredentials, hasCredential |
Methods inherited from interface org.osgi.service.useradmin.Role |
getName, getProperties, getType |
Method Detail |
public boolean addMember(Role role)
role
- The role to add as a basic member.
java.lang.SecurityException
- If a security manager exists and the caller
does not have the UserAdminPermission with name admin.public boolean addRequiredMember(Role role)
role
- The Role object to add as a required member.
java.lang.SecurityException
- If a security manager exists and the caller
does not have the UserAdminPermission with name admin.public boolean removeMember(Role role)
role
- The Role object to remove from this Group object.
java.lang.SecurityException
- If a security manager exists and the caller
does not have the UserAdminPermission with name admin.public Role[] getMembers()
public Role[] getRequiredMembers()
|
OSGi™ Service Platform Release 2 |
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |