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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-1400) StringUtils: Add method for masking strings
Date Fri, 29 Jun 2018 18:25:00 GMT

    [ https://issues.apache.org/jira/browse/LANG-1400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528049#comment-16528049
] 

ASF GitHub Bot commented on LANG-1400:
--------------------------------------

Github user greenman18523 commented on the issue:

    https://github.com/apache/commons-lang/pull/335
  
    > it will not always obviously which minMasked to use.
    
    I am sorry, but I didn't understand this, can you please further elaborate? ``minMasked``
will be one, and it will be the absolute minimum of characters that will be masked.
    
    Examples are SMS messages, e.g. some messages are short and contain one time passwords,
or links to re-assign password. Such messages are generally very short, and since they have
sensitive data, nothing can be logged, thus we have a minMasked value of 30. Also addresses,
depending on how the user inputs it, this can be very few characters (usually just the street
and the street number) or many (city, prefecture, country, etc), so when we print part of
the address we need at least the first 15 characters to be masked.
    
    The use cases might be specific, but considering this is part of a generic API the method
should be flexible, in order to cover a wide variety of usecases.


> StringUtils: Add method for masking strings
> -------------------------------------------
>
>                 Key: LANG-1400
>                 URL: https://issues.apache.org/jira/browse/LANG-1400
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*
>            Reporter: Sergey Ponomarev
>            Priority: Minor
>
> It would be great to have a function which allows to mask the original str by replacing
it's
> characters with the specified character-mask. For eaxmple to mask credit card:
> {code}
> mask("3566002020360505", 4, 4, '*') = "3566********0505"
> {code}
> Thus the number was hidden by asterisks while first and last four digits are unmasked
and seen.
> Common use case is to hide sensitive information from logs, by using it in toString()
of classes or in inputs to log calls.
> I think this is "must have" functionality for Commons Lang library because from my experience
in almost all bit projects what I saw was their home grown masking function.
> I think this is very important also because this is required for masking credit card
numbers by PCI compliance. Also new GDPR rules requires to hide personal info as much as possible
so masking of First and Last names now is required by laws.
> To make the world safer place the utility for masking should be already existing in platform
to avoid situations when developer think  "this is better to mask but I don't have enough
time now so let's do this latter" until leak happens.
> IMHO this should be implemented even in `String` class itself.
> From my experience what I saw was usually few masking usages and styles:
> 1. masking of passwords and names: only first and last symbols are shown, mask char is
`*`
> 2. masking of credit cards: only first and last 4 or 6 symbols are shown, mask char is
`*`.
> 3. credit card number shortest masking of last symbols i.e. `mask("4242424242424242")
== " *4242"` but it's not so often used, I just wanted to mention.
> 4. not masking but showing a length just so see that value was passed. This can be easily
achieved by usual `String.legth()` method.
> There is already some pull request [https://github.com/apache/commons-lang/pull/332]
but I decided to create the ticket because we also need to support masking for ToStringBuilder
and I would like to propose [PR with my own implementation of mask() function|https://github.com/apache/commons-lang/pull/335].
> If you accept my PR then I'll send another one with a new annotation @ToStringMasked
in accordance to [@ToStringExclude|https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/builder/ToStringExclude.html]
which will mark that fields should be masked. Possible usage I see like:
> {code}
> @ToStringMasked(unmaskedStart = 4, unmaskedEnd = 4) 
> String creditCardNumber;
> @ToStringMasked(unmaskedStart = 1, unmaskedEnd = 1) 
> String password;
> {code}
>  



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