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7.4. Data Role Definition

7.4.1. Data Role Definition
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Data roles are defined inside the vdb.xml file. (You will find this inside the .vdb zip archive under META-INF/vdb.xml if you used Teiid Designer). The vdb.xml file is checked against the vdb-deployer.xsd schema file found in the EAP_HOME/docs/teiid/schema directory.

7.4.2. Data Role Definition Example
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Consider the scenario in which a VDB defines a table "TableA" in schema "modelName" with columns (column1, column2) - note that the column types do not matter.
We wish to define three roles "RoleA", "RoleB", "RoleC" with the following permissions:
  1. RoleA has permissions to read, write access to TableA, but can not delete.
  2. RoleB has no permissions that allow access to TableA
  3. RoleC has permissions that only allow read access to TableA.column1

Example 7.1. vdb.xml defining RoleA, RoleB, and RoleC

<?xml version="1.0" encoding="UTF-8"?>
<vdb name="sample" version="1">

    <model name="modelName">
        <source name="source-name" translator-name="oracle" connection-jndi-name="java:myDS" />
    </model>

    <data-role name="RoleA">
        <description>Allow all, except Delete</description>

        <permission>
            <resource-name>modelName.TableA</resource-name>
            <allow-create>true</allow-create>
            <allow-read>true</allow-read>
            <allow-update>true</allow-update>
        </permission>

        <mapped-role-name>role1</mapped-role-name>

    </data-role>

    <data-role name="RoleC">
        <description>Allow read only</description>

        <permission>
            <resource-name>modelName.TableA</resource-name>
            <allow-read>true</allow-read>
        </permission>

        <permission>
            <resource-name>modelName.TableA.colum2</resource-name>
            <allow-read>false</allow-read>
        </permission>

        <mapped-role-name>role2</mapped-role-name>
    </data-role>
</vdb>
The above XML defined two data roles, "RoleA" which allows everything except delete on the table, "RoleC" that allows only read operation on the table. Since JBoss Data Virtualization uses deny by default, there is no explicit data-role entry needed for "RoleB". Note that explicit column permissions are not needed for RoleA, since the parent resource path, modelName.TableA, permissions still apply. RoleC however must explicitly disallow read to column2.
The "mapped-role-name" defines the container JAAS roles that are assigned the data role. For assigning roles to your users in the JBoss EAP, see the instructions for the selected Login Module. See the Administrator Guide for configuring Login Modules.

7.4.3. Data Role Definition Example: Additional Attributes
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You may also choose to allow any authenticated user to have a data role by setting the any-authenticated attribute value to true on data-role element.
The "allow-create-temporary-tables" data-role boolean attribute is used to explicitly enable or disable temporary table usage for the role. If it is left unspecified, then the value will be defaulted to false.

Example 7.2. Temp Table Role for Any Authenticated

<data-role name="role" any-authenticated="true" allow-create-temporary-tables="true">
     <description>Temp Table Role for Any Authenticated</description>

     <permission>
         ...
     </permission>

</data-role>

7.4.4. Data Role Definition Example: Language Access
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The following shows a vdb xml that allows the use of the javascript language. The allowed-languages property enables the languages use for any purpose in the vdb, while the allow-language permission allows the language to be used by users with RoleA.

Example 7.3. vdb.xml allowing JavaScript access

<?xml version="1.0" encoding="UTF-8"?>
<vdb name="sample" version="1">

    <property name="allowed-languages" value="javascript"/>

    <model name="modelName">
        <source name="source-name" translator-name="oracle" connection-jndi-name="java:myDS" />
    </model>

    <data-role name="RoleA">
        <description>Read and javascript access.</description>

        <permission>
            <resource-name>modelName</resource-name>
            <allow-read>true</allow-read>
        </permission>

        <permission>
            <resource-name>javascript</resource-name>
            <allow-language>true</allow-language>
        </permission>

        <mapped-role-name>role1</mapped-role-name>

    </data-role>

</vdb>

7.4.5. Data Role Definition Example: Row-Based Security
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The following shows a VDB XML definition utilizing a condition to restrict access. The condition acts as both a filter and constraint. Even though RoleA opens up read/insert access to modelName.tblName, the base-role condition will ensure that only values of column1 matching the current user can be read or inserted. Note that here the constraint enforcement has been disabled.

Example 7.4. vdb.xml allowing conditional access

<?xml version="1.0" encoding="UTF-8"?>
<vdb name="sample" version="1">

    <model name="modelName">
        <source name="source-name" translator-name="oracle" connection-jndi-name="java:myDS" />
    </model>

    <data-role name="base-role" any-authenticated="true">
        <description>Conditional access</description>

        <permission>
            <resource-name>modelName.tblName</resource-name>
            <condition constraint="false">column1=user()</condition>
        </permission>

    </data-role>

    <data-role name="RoleA">
        <description>Read/Insert access.</description>

        <permission>
            <resource-name>modelName.tblName</resource-name>
            <allow-read>true</allow-read>
            <allow-create>true</allow-create>
        </permission>

        <mapped-role-name>role1</mapped-role-name>

    </data-role>

</vdb>

7.4.6. Data Role Definition Example: Column Masking
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The following shows VDB XML utilizing column masking. Here the RoleA column1 mask takes precedence over the base-role mask, but only for a subset of the rows as specified by the condition. For users without RoleA, access to column1 will effectively be replaced with "CASE WHEN column1=user() THEN column1 END", while for users with RoleA, access to column1 will effectively be replaced with "CASE WHEN column2='x' THEN column1 WHEN TRUE THEN CASE WHEN column1=user() THEN column1 END END".

Example 7.5. vdb.xml with column masking

<?xml version="1.0" encoding="UTF-8"?>
<vdb name="sample" version="1">

    <model name="modelName">
        <source name="source-name" translator-name="oracle" connection-jndi-name="java:myDS" />
    </model>
    
    <data-role name="base-role" any-authenticated="true">
        <description>Masking</description>

        <permission>
            <resource-name>modelName.tblName.column1</resource-name>
            <mask>CASE WHEN column1=user() THEN column1 END</mask>
        </permission>

    </data-role>

    <data-role name="RoleA">
        <description>Read/Insert access.</description>

        <permission>
            <resource-name>modelName.tblName</resource-name>
            <allow-read>true</allow-read>
            <allow-create>true</allow-create>
        </permission>

        <permission>
            <resource-name>modelName.tblName.column1</resource-name>
            <condition>column2='x'</condition>
            <mask order="1">column1</mask>
        </permission>

        <mapped-role-name>role1</mapped-role-name>

    </data-role>

</vdb>
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