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".

Building with the diet libc
---------------------------

This package optionally can be built with the diet libc instead of the
glibc to provide small statically linked programs.  The resulting package
has no dependency on any other package.

To use the diet libc, make sure the latest versions of the dietlibc-dev
package is installed, and set DEB_BUILD_OPTIONS=diet in the environment
when building the package, e.g.:

 # apt-get install dietlibc-dev
 $ DEB_BUILD_OPTIONS=diet fakeroot apt-get source -b dropbear

 -- Gerrit Pape <[email protected]>, Sat, 17 Jul 2004 19:09:34 +0000