Fix handling of replies to global requests (#112) The current code assumes that all global requests want / need a reply. This isn't always true and the request itself indicates if it wants a reply or not. It causes a specific problem with [email protected] messages. These are sent by OpenSSH after authentication to inform the client of potential other host keys for the host. This can be used to add a new type of host key or to rotate host keys. The initial information message from the server is sent as a global request, but with want_reply set to false. This means that the server doesn't expect an answer to this message. Instead the client needs to send a prove request as a reply if it wants to receive proof of ownership for the host keys. The bug doesn't cause any current problems with due to how OpenSSH treats receiving the failure message. It instead treats it as a keepalive message and further ignores it. Arguably this is a protocol violation though of Dropbear and it is only accidental that it doesn't cause a problem with OpenSSH. The bug was found when adding host keys support to libssh, which is more strict protocol wise and treats the unexpected failure message an error, also see https://gitlab.com/libssh/libssh-mirror/-/merge_requests/145 for more information. The fix here is to honor the want_reply flag in the global request and to only send a reply if the other side expects a reply.

Building with the diet libc
---------------------------

This package optionally can be built with the diet libc instead of the
glibc to provide small statically linked programs.  The resulting package
has no dependency on any other package.

To use the diet libc, make sure the latest versions of the dietlibc-dev
package is installed, and set DEB_BUILD_OPTIONS=diet in the environment
when building the package, e.g.:

 # apt-get install dietlibc-dev
 $ DEB_BUILD_OPTIONS=diet fakeroot apt-get source -b dropbear

 -- Gerrit Pape <[email protected]>, Sat, 17 Jul 2004 19:09:34 +0000