[jira] [Updated] (DIRSERVER-2068) Failed to decrypt a timestamp if it was encrypted with non-best-fit algo

["Emmanuel Lecharny (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DIRSERVER-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emmanuel Lecharny updated DIRSERVER-2068:
-----------------------------------------
    Fix Version/s:     (was: 2.0.0-M24)
                   2.0.0-M25

> Failed to decrypt a timestamp if it was encrypted with non-best-fit algo
> ------------------------------------------------------------------------
>
>                 Key: DIRSERVER-2068
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-2068
>             Project: Directory ApacheDS
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 2.0.0-M20
>            Reporter: Alexander Bersenev
>            Priority: Major
>             Fix For: 2.0.0-M25
>
>         Attachments: preauth.patch
>
>
> Suppose the client supports two encryption suites:
> default_tkt_enctypes = des-cbc-md5 des3-cbc-sha1-kd
> Server also supports three encryption suites: 
> des-cbc-md5, des3-cbc-sha1-kd and aes128-cts-hmac-sha1-96
> The client send as-req with list of supported ciphers. Server answers the client with three ciphers.
> The client chooses des-cbc-md5 and sends as-req with encrypted timestamp.
> The bug is here. The server can try to decrypt timestamp with wrong algo(des3-cbc-sha1-kd). This occurs because of function 
> getBestEncryptionType( Set<EncryptionType> requestedTypes,        Set<EncryptionType> configuredTypes )
> returns some encryption type that both client and server support. It not necessary the cipher that was used to encrypt the timestamp.
> Attached patch does decryption of timestamp always with cipher it was encrypted(if the server is configured to support that cipher)



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