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From "Andrzej Rusin (JIRA)" <server-...@james.apache.org>
Subject [jira] [Commented] (JAMES-1427) DoS scenario(s) in SMTP server
Date Fri, 22 Mar 2013 20:17:15 GMT

    [ 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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