Introduce extra delay before closing unauthenticated sessions To make it harder for attackers, introduce a delay to keep an unauthenticated session open a bit longer, thus blocking a connection slot until after the delay. Without this, while there is a limit on the amount of attempts an attacker can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to handle one attempt is still short and thus for each of the allowed parallel attempts many attempts can be chained one after the other. The attempt rate is then: "MAX_UNAUTH_PER_IP / <process time of one attempt>". With the delay, this rate becomes: "MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".

Source: dropbear
Section: net
Priority: optional
Maintainer: Gerrit Pape <[email protected]>
Build-Depends: libz-dev
Standards-Version: 3.7.3.0

Package: dropbear
Architecture: any
Depends: ${shlibs:Depends}
Suggests: openssh-client, runit
Description: lightweight SSH2 server and client
 dropbear is a SSH 2 server and client designed to be small enough to
 be used in small memory environments, while still being functional and
 secure enough for general use.
 .
 It implements most required features of the SSH 2 protocol, and other
 features such as X11 and authentication agent forwarding.
 .
 See http://matt.ucc.asn.au/dropbear/dropbear.html