Mercurial > dropbear
view libtomcrypt/src/misc/crypt/crypt_register_all_prngs.c @ 1790:42745af83b7d
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 | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ #include "tomcrypt.h" /** @file crypt_register_all_prngs.c Steffen Jaeckel */ #define REGISTER_PRNG(h) do {\ LTC_ARGCHK(register_prng(h) != -1); \ } while(0) int register_all_prngs(void) { #ifdef LTC_YARROW REGISTER_PRNG(&yarrow_desc); #endif #ifdef LTC_FORTUNA REGISTER_PRNG(&fortuna_desc); #endif #ifdef LTC_RC4 REGISTER_PRNG(&rc4_desc); #endif #ifdef LTC_CHACHA20_PRNG REGISTER_PRNG(&chacha20_prng_desc); #endif #ifdef LTC_SOBER128 REGISTER_PRNG(&sober128_desc); #endif #ifdef LTC_SPRNG REGISTER_PRNG(&sprng_desc); #endif return CRYPT_OK; } /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */