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https://issues.apache.org/jira/browse/GEODE-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713172#comment-15713172
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Hitesh Khamesra commented on GEODE-2153:
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 I think we need to mention that how one can you use Postprocessor callback for 
security purpose. One can take this as the just reference implementation.

> PostProcessor security
> ----------------------
>
>                 Key: GEODE-2153
>                 URL: https://issues.apache.org/jira/browse/GEODE-2153
>             Project: Geode
>          Issue Type: Improvement
>          Components: security
>            Reporter: Jared Stewart
>
> I have started a server and locator using the sample RedactingPostProcessor 
> implementation.  I created a /customers region and inserted a Customer: 
> {code}
>  Region<String, Customer> region = connectToRegion("customers");
> Customer customer = new Customer(1L, "FirstName", "LastName", "123-456-7890");
> region.put("galen", customer);
> {code}
> The following query and get operation show our customer's SSN getting 
> redacted as expected:
> {code}
> Customer customerFromGet = region.get("galen"); 
> //{ type = com.jaredjstewart.Customer, customerId = 1, firstName = FirstName, 
> lastName = LastName, ssn = ********** }
> Object customerFromQuery = queryService.newQuery("select * from 
> /customers").execute();
> //{ type = com.jaredjstewart.Customer, customerId = 1, firstName = FirstName, 
> lastName = LastName, ssn = ********** }
> {code}
> However, it is possible to leak information by accessing the field which is 
> supposed to be redacted in a where clause:
> {code}
>      Object customer = queryService.newQuery("select c from /customers c 
> where c.socialSecurityNumber='123-456-7890'").execute();
>  //this redacts but still leaks the vital information
> {code}
> It is also possible to query the field directly:
> {code}
> Object customerSSN = queryService.newQuery("select c.socialSecurityNumber 
> from /customers c").execute();
> //[123-456-7890]
> {code}



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