Mercurial > dropbear
view dbhelpers.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> |
---|---|
date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | d68d61e7056a |
children |
line wrap: on
line source
#ifndef DROPBEAR_DBHELPERS_H_ #define DROPBEAR_DBHELPERS_H_ /* This header defines some things that are also used by libtomcrypt/math. We avoid including normal include.h since that can result in conflicting definitions - only include config.h */ #include "config.h" #ifdef __GNUC__ #define ATTRIB_PRINTF(fmt,args) __attribute__((format(printf, fmt, args))) #define ATTRIB_NORETURN __attribute__((noreturn)) #define ATTRIB_SENTINEL __attribute__((sentinel)) #else #define ATTRIB_PRINTF(fmt,args) #define ATTRIB_NORETURN #define ATTRIB_SENTINEL #endif void m_burn(void* data, unsigned int len); #endif /* DROPBEAR_DBHELPERS_H_ */