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https://issues.apache.org/jira/browse/AMBARI-20772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Levas updated AMBARI-20772:
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    Description: 
Characters used in usernames should be constrained such that they cannot 
contain the following characters:

* Less than symbols ( < )
* Greater than symbols ( > )
* Ampersand ( & )
* Back slashes ( \ )




  was:
Characters used in usernames should be constrained such that they can contain:

* Letters ( a-z )
* Numbers ( 0-9 )
* Dashes ( - )
* Underscores ( _ ),
* Apostrophes ( ' )
* Periods ( . )
* Commas ( , )
* At symbols ( @ )
* Dollar sign ( $ )
* Percent signs (%)
* Forward slashes ( / )
* Tildes ( ~ )





> FE: Characters used in usernames should be constrained 
> -------------------------------------------------------
>
>                 Key: AMBARI-20772
>                 URL: https://issues.apache.org/jira/browse/AMBARI-20772
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-web
>    Affects Versions: 2.0.0
>            Reporter: Robert Levas
>            Assignee: Yusaku Sako
>            Priority: Critical
>              Labels: security
>             Fix For: 2.5.1
>
>
> Characters used in usernames should be constrained such that they cannot 
> contain the following characters:
> * Less than symbols ( < )
> * Greater than symbols ( > )
> * Ampersand ( & )
> * Back slashes ( \ )



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