[jira] [Commented] (JAMES-1427) DoS scenario(s) in SMTP server

["Andrzej Rusin (JIRA)" <se...@james.apache.org>]

    [ https://issues.apache.org/jira/browse/JAMES-1427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611184#comment-13611184 ] 

Andrzej Rusin commented on JAMES-1427:
--------------------------------------

org.apache.james.protocols.smtp.core.fastfail.MaxUnknownCmdHandler exists for the purpose of B which solves 1 and 2.
Unfortunately it does not work because of JAMES-1494
                
> DoS scenario(s) in SMTP server
> ------------------------------
>
>                 Key: JAMES-1427
>                 URL: https://issues.apache.org/jira/browse/JAMES-1427
>             Project: James Server
>          Issue Type: Bug
>          Components: SMTPServer
>    Affects Versions: 3.0-beta3
>            Reporter: Andrzej Rusin
>
> 1. SMTP server allows unlimited number of invalid commands, which may waste network bandwidth.
> 2. The invalid commands go straight to the logs with level INFO, which can easily fill up the server disk.
> Additionally:
> 3. After the max message size is reached, the SMTP server denies the message, but client keeps sending, which makes the remaining part of the message go straight to the log because of 2.
> Ideas to fix:
> A. Do not log more than N invalid commands per connection - solve 2,
> B. Drop connection after Nth (consecutive?) invalid command - solve 1 and 2,
> C. (This one is questionable) Drop the connection after max message size is reached - solve 3

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