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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".
author Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
date Wed, 15 Feb 2017 13:53:04 +0100
parents 2fd52c383163
children
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#ifndef DROPBEAR_OPTIONS_H
#define DROPBEAR_OPTIONS_H

/* 
            > > > Don't edit this file any more! < < <
            
Local compile-time configuration should be defined in localoptions.h
in the build directory.
See default_options.h.in for a description of the available options.
*/

/* Some configuration options or checks depend on system config */
#include "config.h"

#ifdef LOCALOPTIONS_H_EXISTS
#include "localoptions.h"
#endif

/* default_options.h is processed to add #ifndef guards */
#include "default_options_guard.h"

/* Some other defines that mostly should be left alone are defined
 * in sysoptions.h */
#include "sysoptions.h"

#endif /* DROPBEAR_OPTIONS_H */