Mercurial > dropbear
view dh_groups.h @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | ee6ccc2ecc47 |
children |
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#ifndef DROPBEAR_DH_GROUPS_H #define DROPBEAR_DH_GROUPS_H #include "options.h" #if DROPBEAR_NORMAL_DH #if DROPBEAR_DH_GROUP1 #define DH_P_1_LEN 128 extern const unsigned char dh_p_1[DH_P_1_LEN]; #endif #if DROPBEAR_DH_GROUP14 #define DH_P_14_LEN 256 extern const unsigned char dh_p_14[DH_P_14_LEN]; #endif #if DROPBEAR_DH_GROUP16 #define DH_P_16_LEN 512 extern const unsigned char dh_p_16[DH_P_16_LEN]; #endif extern const int DH_G_VAL; #endif /* DROPBEAR_NORMAL_DH */ #endif