Someone

ServerName              "blah"
ServerType              standalone
DefaultServer           on
Port                    21

MaxInstances            30

User                    nobody
Group                   nobody

AllowOverwrite          on
ShowSymlinks            on
RequireValidShell       off
CapabilitiesEngine      off
AllowStoreRestart       on

<Limit SITE_CHMOD>
  DenyAll
</Limit>

<Directory />
    <Limit ALL>
        DenyAll
    </Limit>
</Directory>

<Directory /home/ftp>
    <Limit ALL>
        AllowAll
    </Limit>
    <Limit WRITE>
        DenyAll
    </Limit>
</Directory>

<Directory /home/ftp/incoming>
    Umask 022
    <Limit WRITE>
        AllowAll
    </Limit>
    <Limit DELE RMD XRMD RNFR RNTO RETR>
        DenyAll
    </Limit>
    AllowStoreRestart on
</Directory>