authorization and security enforcement

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Authorization and Security Enforcement

Andy HindSenior Developer, Alfresco

twitter: @andy_hind

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What’s in the mix?

• Public services • Methods + Context (node, parent, ...)

• Principal• Authorities

• Groups, owner

• Permissions• Read, check out

• ACLs• Enforcement• What operations can I perform?• Configuration• Customisation - RM

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Public Services

Security Enforcement

• wrapped base services• pre-execution checks

• Can I .... ?• Check with context• PublicServiceAccessService• Much more reliable than using hasPermission

• post-execution checks and filtering

• public-services-context.xml• public-services-security-context.xml

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Public Services


<bean id="NodeService" class="org.springframework.aop.framework.ProxyFactoryBean">

<property name="proxyInterfaces">

<list>

<value>org.alfresco.service.cmr.repository.NodeService</value>

</list>

</property>

<property name="target">

<ref bean="nodeService"/>

</property>

<property name="interceptorNames">

<list>

<idref local="NodeService_transaction"/>

<idref local="AuditMethodInterceptor"/>

<idref local="exceptionTranslator"/>

<idref bean="NodeService_security"/>

</list>

</property>

</bean>

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Public Services


<bean id="NodeService_security" class="org.alfresco.repo.security.permissions.impl.acegi.MethodSecurityInterceptor">

<property name="authenticationManager"><ref bean="authenticationManager"/></property>

<property name="accessDecisionManager"><ref local="accessDecisionManager"/></property>

<property name="afterInvocationManager"><ref local="afterInvocationManager"/></property>

<property name="objectDefinitionSource">

<value>

org.alfresco.service.cmr.repository.NodeService.getStores=ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties

org.alfresco.service.cmr.repository.NodeService.createStore=ACL_METHOD.ROLE_ADMINISTRATOR

org.alfresco.service.cmr.repository.NodeService.exists=ACL_ALLOW

org.alfresco.service.cmr.repository.NodeService.getNodeStatus=ACL_NODE.0.sys:base.ReadProperties

org.alfresco.service.cmr.repository.NodeService.getRootNode=ACL_NODE.0.sys:base.ReadProperties

org.alfresco.service.cmr.repository.NodeService.createNode=ACL_NODE.0.sys:base.CreateChildren

...

org.alfresco.service.cmr.repository.NodeService.*=ACL_DENY

</value>

</property>

</bean>

public ChildAssociationRef createNode(

NodeRef parentRef,

QName assocTypeQName,

QName assocQName,

QName nodeTypeQName)

throws InvalidNodeRefException, InvalidTypeException;

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Public Services







<value>







...


</value>

</property>

</bean>


NodeRef parentRef,


QName assocQName,



createNode=ACL_NODE.0.sys:base.CreateChildren

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Public Services







<value>







...


</value>

</property>

</bean>


NodeRef parentRef,


QName assocQName,



createNode=ACL_NODE.0.sys:base.CreateChildren

public ChildAssociationRef createNode( NodeRef parentRef,

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Public Services







<value>







...


</value>

</property>

</bean>


NodeRef parentRef,


QName assocQName,




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Authorities

• Principal• userName of the Person matched at log in• andy

• Groups• GROUP_woof

• “Role” • ROLE_ADMINISTRATOR

• Group, configuration• DynamicAuthority interface

• ROLE_OWNER• ROLE_LOCK_OWNER

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Authorities

Zones

• authorities are in one or more zones• hide groups used as RBAC roles

• APP.DEFAULT• APP.SHARE• APP.RM• AUTH.ALF• AUTH.EXT.<ID>

• Dynamic authorities are not zoned

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Permissions

Ownable – aspect/permissions/service/dynamic authority

<permissionSet type="cm:ownable" expose="selected">



<permissionGroup name="TakeOwnership" requiresType="false" expose="false">

<includePermissionGroup permissionGroup="SetOwner" type="cm:ownable" />

</permissionGroup>

<permissionGroup name="SetOwner" requiresType="false" expose="false"/>



<permission name="_SetOwner" expose="false" requiresType="false">

<grantedToGroup permissionGroup="SetOwner" />

<requiredPermission on="node" type="sys:base" name="_WriteProperties" />

</permission>

</permissionSet>

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ACLs

Introduction

• All nodes have an ACL• An ACL applies to the node and ALL of its properties

• Content read and write are special• There are no property level permissions

• One global ACL (context free) – applies to all nodes• An ACL is a list of ACEs• Optionally an ACL inherits ACEs from its primary parent • ACE

• Authority – Permissions – Deny/Allow – (Unused context)

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ACLs

Example

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ACLs

Example

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ACLs

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ACLs

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ACLs

Example

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All – Read – Allow – 0

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ACLs

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ACLs

Example

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All – Read – Allow – 2ROLE_OWNER – All – Allow – 0

GROUP_A – Write – Allow – 0GROUP_A – CreateChildren – Allow – 0

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ACLs

Example

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All – Read – Allow – 2Andy – All – Allow – 0

Bob – Write – Allow – 0 Bob – WriteContent – Deny – 0

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Configuration

Back to NodeService security enforcement

• org.alfresco.service.cmr.repository.NodeService.getStores• ACL_ALLOW,AFTER_ACL_NODE.sys:base.ReadProperties

• org.alfresco.service.cmr.repository.NodeService.createStore• ACL_METHOD.ROLE_ADMINISTRATOR

• org.alfresco.service.cmr.repository.NodeService.exists• ACL_ALLOW

• org.alfresco.service.cmr.repository.NodeService.getNodeStatus

• ACL_NODE.0.sys:base.ReadProperties

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Configuration

Back to NodeService security enforcement (2)

•org.alfresco.service.cmr.repository.NodeService.createNode• ACL_NODE.0.sys:base.CreateChildren

•org.alfresco.service.cmr.repository.NodeService.moveNode• ACL_NODE.0.sys:base.DeleteNode• ACL_NODE.1.sys:base.CreateChildren

•org.alfresco.service.cmr.repository.NodeService.addChild• ACL_NODE.0.sys:base.CreateChildren• ACL_NODE.1.sys:base.ReadProperties

• org.alfresco.service.cmr.repository.NodeService.*• ACL_DENY

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Configuration

Configuration options

• ACL_METHOD.<authority>• ACL_NODE.<#>.<permission>• ACL_PARENT.<#>.<permission>• ROLE_ . . .• GROUP_ . . .

• AFTER_ACL_NODE.<permission>• AFTER_ACL_PARENT.<permission>

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History

• 2.2• AVM ACL for every nodes

• 3.0 • DM ACL for every node

•3.2 • RM

• 3.4• Query read improvements• Removed hibernate

• Future• Integrate read evaluation in the query• Read evaluation on the DB

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Evaluation/Performance

• “system”• Global permissions

• “admin”

• Node ACLs and dynamic authorities• Bulk fetch of node properties

• AuthenticationUtil.runAs()

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Extension

Common extensions

• Changing existing settings• Adding a new service and protection

• Types and aspects• Related permissions and permission groups• Dynamic authorities• Public service• Public service security configuration

• Replace/extend voting – RM

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RM

Introduction

• Capabilities (50 +)• CreateModifyDestroyFoldersCapability

• Caveats • Supplementary marking

• Property with a list of allowable values• Authority assigned one or more values• Authority must have one or all matching values to read the record

• Classified records• Hierarchy of security levels

• Also uses normal ACLs

• Adds a new AccessDecisionVoter and related classes• RM.<Policy>.<#>.<#>...• RM_CAP.<Capability>.<#>.<capability>• RM_ALLOW, RM_DENY

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RM

Modified NodeService protection example

•org.alfresco.service.cmr.repository.NodeService.createNode• ACL_NODE.0.sys:base.CreateChildren,RM.Create.0.3

• Create is a combination of RM capabilities• NodeService.createNode()• NodeService.addChild()• FileFolderService.copy()• FileFolderService.create()

• destination• node copied or linked OR type created• Checking for the CreateChildren permission is not enough

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RM

Create policy has to consider

• Read access to target for link or copy• File records capability• Create modify destroy folders capability• Declare records in closed folders capability• Create/modify records in cutoff folders capability• Create/modify/destroy fileplan metadata capability• Change or delete references capability

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Learn Morewiki.alfresco.comforums.alfresco.comtwitter: @AlfrescoECM

authorization and security enforcement

Technology

context node

public services

customisation rm