ESciDoc Institutional visibility

Requirement

Access to content of a component should be restricted to users that may

• retrieve the item and
• belong to an organizational unit or child-org-unit of a list of Org units that is defined for the component.

Question: So System-Administrator will not be able to retrieve content if he is not in the proper orgUnit? -- Mih 06:42, 3 September 2008 (UTC)

Is there an answer to that question? If there is really an AND between "retrieve the item" and "belong to an OU ..." it has a huge impact to policy evaluation. The problem is the "visibility policy" is an additional one that is evaluated independent from the policies bound to a role. As I understand, till now access is granted if no "role policy" denies access (after allowing the action by a previous policy (The case there is no policy at all should not affect this argument!?)). So, if the only policy bound to the role system-admin is "allow all" then the system admin is allowed to access everything (also binary content). With this "visibility role" we introduce an additional policy that is now evaluated for system admin too and denies access to binary content in case system admin is not member of a named OU. Frank 15:36, 3 September 2008 (UTC)

Would really not dig too much now in the System administrator role, local administrator role. What is now important is that we have one user e.g. roland that is allowed to do any action in the repository. Local administrators are usually people in the institute who take care of creation of users in the institute, maybe creation of org units and evtl. contexts. They are not necessarily people who has certain visibility policy on the content in those contexts. Therefore probably we should approach their privileges from completely different set of actions/resources to which they have privs. (In other words: It would be the policy of the institute to say e.g. my local admin will be moderator for all pubman contexts - then when local administrator creates a context she should assign him/herself moderator policy for that context). --Natasa 10:53, 8 September 2008 (UTC)

The requirement should be extendable so that it is possible to restrict the access also to certain user groups or certain ip-ranges.

Question: How can we evaluate the user group or the ip-address of the user if the framework does not know about it? -- Mih 14:48, 2 September 2008 (UTC)

One can not be certain at the moment. The fact is probably that somehow we should support the concept of a user group (or incoming IP address) i.e. core services (either via Shib attributes or via new group concept) should know that a certain user is member of a certain user group. AA should be also aware of a "group" handle in this case? (note: user as member of a group has certain group privileges i.e. to view the content, but the very same user has also privileges on e.g. his pending items at the same time). Not certain yet - todo further research --Natasa 10:53, 8 September 2008 (UTC)

Shibboleth 2 support for several authentication mechanisms to be used in parallel. See also https://spaces.internet2.edu/display/SHIB2/IdPUserAuthn and https://spaces.internet2.edu/display/SHIB2/IdPAuthIP . Is that something of use?

Shibboleth 1.x provides following howtos https://spaces.internet2.edu/display/SHIB/IPIdPAuthN for Ip based access. In this case, IPs are related to an e.g. Guest user who has own privileges. To be checked if we can have different such guest users for different IP ranges.--Natasa 11:16, 8 September 2008 (UTC)

Proposal

• Invent possibility to attach XACML-Policies to Objects + to attach Attributes to these ObjectPolicies (eg a list of OrgUnit-Ids).
  • Don't store the XACML-Policies + Attributes within the Object but outside in a database.
    • One Database-Table that stores all possible ObjectPolicies (eg OrgUnitContentRestrictionPolicy)
    • One Database-Table that brings together the object and the policy.
      • Fields:
        • objectId
        • policyId (reference to Policies-DB-Table)
        • list of Attributes
  • Mark certain Methods (eg retrieveContent) as Method where ObjectPolicies have to get evaluated.

    for files / locators: object policies should be certainly evaluated when retrieving the content

Mih 12:26, 4 September 2008 (UTC) if the file/locator points to an external url and not to our internal content, then it will certainly not be possible to apply policies when requesting the content because the content is located external!

to my understanding eSciDoc supports the following types of storage:internal-managed, external-url and external-managed. With this in mind object policies are applicable for internal-managed and external-managed and not for external-url. That is also how we understood it, as all our locators have at present "public" visibility. We can not control the access on external-url (our locators). --Natasa 08:33, 5 September 2008 (UTC)

we should have information provided with component-level properties/metadata on component-level visibility. If the visibility is a "policy" then in addition id of the policy that needs to be evaluated (i.e. this information can be provided in retrieveItem and retrieveComponent methods) --Natasa 10:50, 29 August 2008 (UTC)

• • We do not really have a visibility for the content that we could set to any value. We will have policies for 'private' access, 'public' access and 'ou-access'. Later on there will be more policies like eg 'user group'. These policies can get attached to the object and these policies will get evaluated when calling certain methods (retrieve-content). The names of the methods where the policy has to get evaluated is defined within the policy. This means that we can attach any policies to any object. We should not have a reference to the policies in the object-xml. Maybe later on we want to have an object-policy that gets evaluated when calling retrieveItem or retrieveProperties. If someone wants to know the policies that are attached to a specific object, there will be a new handler-method in the AA-Component that can deliver all object-policies for one object.Mih 11:36, 1 September 2008 (UTC)

  • Invent new Handler-Methods into the AA-Component that enable creating, updating, deleting and retrieval of ObjectPolicies + Attributes for one Object.

    in addition evaluating the policy? --Natasa 10:50, 29 August 2008 (UTC)

Mih 13:19, 4 September 2008 (UTC)

• • Invent new Handler-Methods into the AA-Component that enable defining one or more ous for one user. The ous the user belongs to get stored in the database and are used during evaluation of the orgUnit-Object-Policy.

• Evaluate these Policies in addition to the RolePolicies the user has. If the RolePolicies return a Permit and the ObjectPolicies return a Permit, then the user is allowed to access the Method (eg retrieveContent).Vice-Versa: If one of the Policies returns a Deny, then the user is not allowed to access the Method.

• If no object-policy is attached to the object, only the role-policies are evaluated.

  to clarify this better: a role policy for context is evaluated on item level, in addition, each item may have object-level policy for each file. So users do not have to have different object-level policies for items+object-level policies for files. The case is usually, role-level policy on ctx+object-level policy on file (optional, in case visibility is "policy")--Natasa 10:50, 29 August 2008 (UTC)

• Element visibility in component-properties is not used anymore

  element visibility may be used as a short-cut to tell: it's public, private or a policy should be evaluated (so that system does not go always to the XACML policy store)--Natasa 10:50, 29 August 2008 (UTC)

  public and private also will be policies. Instead of parsing the item-xml to retrieve the content of the element visibility, we now have to go to the database and retrieve the policies for the object and then evaluate them. Database-Access hopefully will not be less performant than parsing the xml.--Mih 11:36, 1 September 2008 (UTC)

Mih 12:33, 4 September 2008 (UTC) We decided to additionally have the visibility-element within the component-properties as before. Values of the element can be: 'public', 'private' or the name of the policy used (eg 'orgUnit').
It will not be possible to keep the policy-information attached to each item-version. If the policy changes then the new policy will also get evaluated when requesting older versions of the component!

Examples of fulltext visibility at present on eDoc

• Metadaten öffentlich + Volltext öffentlich ("Public")
• Metadaten öffentlich + Volltext für die MPG ("MPG wide access")
• Metadaten öffentlich + Volltext für das MPI ("Institute level access": Damit schränkt man den Zugriff auf das gesamte MPI ein. Jeder Nutzer, der entweder für das MPI registriert ist – Erkennung über Login – oder sich über einen Computer des Instituts einloggt – Erkennung über IP-Adresse – hat Zugriff)
• Metadaten öffentlich + Volltext für einen internen Nutzerkreis ("internal access": Damit schränkt man den Zugriff auf einen internen Nutzerkreis ein: local eDoc Manager, Collection Authority, Collection Moderator und Depositor/Owner des Dokuments)
• Metadaten öffentlich + Volltext nur für privilegierte Nutzer ("Privileged users access": Damit schränkt man den Zugriff auf eine privilegierte Nutzergruppe ein: local eDoc Manager, Collection Authority, Collection Moderator, Nutzer mit Privileged View für diese Collection und Depositor/Owner des Dokuments)

Coordinated Universal Time

Organizational Unit

Internet Protocol

Logging-in system for computer networks

eXtensible Access Control Markup Language

Enhanced Scientific Documentation

Electronic Documentation

Max-Planck-Gesellschaft

Max-Planck-Institut