Mercurial > dropbear
view fuzz-wrapfd.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 | e75dab5bec71 |
children | dfbe947bdf0d |
line wrap: on
line source
#ifndef FUZZ_WRAPFD_H #define FUZZ_WRAPFD_H #include "buffer.h" enum wrapfd_mode { UNUSED = 0, PLAIN, INPROGRESS, RANDOMIN }; void wrapfd_setup(void); void wrapfd_setseed(uint32_t seed); // doesn't take ownership of buf. buf is optional. void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode); // called via #defines for read/write/select int wrapfd_read(int fd, void *out, size_t count); int wrapfd_write(int fd, const void* in, size_t count); int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout); int wrapfd_close(int fd); #endif // FUZZ_WRAPFD_H