Mercurial > dropbear
annotate crypto_desc.h @ 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> |
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date | Wed, 15 Feb 2017 13:53:04 +0100 |
parents | 9169e4e7cbee |
children |
rev | line source |
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1036
deed0571cacc
DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
857
diff
changeset
|
1 #ifndef DROPBEAR_CRYPTO_DESC_H |
deed0571cacc
DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
857
diff
changeset
|
2 #define DROPBEAR_CRYPTO_DESC_H |
766 | 3 |
1276
9169e4e7cbee
fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents:
1036
diff
changeset
|
4 void crypto_init(void); |
766 | 5 |
6 extern int dropbear_ltc_prng; | |
7 | |
1036
deed0571cacc
DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
857
diff
changeset
|
8 #endif /* DROPBEAR_CRYPTO_DESC_H */ |
766 | 9 |