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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.
author Dirkjan Bussink <d.bussink@gmail.com>
date Thu, 10 Dec 2020 16:13:13 +0100
parents 7b68e581985f
children
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#!/usr/bin/make -f

export DEB_BUILD_MAINT_OPTIONS = hardening=+all
DPKG_EXPORT_BUILDFLAGS = 1
include /usr/share/dpkg/buildflags.mk

#export DH_OPTIONS
DEB_HOST_GNU_TYPE ?=$(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
DEB_BUILD_GNU_TYPE ?=$(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)

STRIP =strip
ifneq (,$(findstring nostrip,$(DEB_BUILD_OPTIONS)))
  STRIP =: nostrip
endif

CONFFLAGS =
CC =gcc
ifneq (,$(findstring diet,$(DEB_BUILD_OPTIONS)))
  CONFFLAGS =--disable-zlib
  CC =diet -v -Os gcc -nostdinc
endif

DIR =$(shell pwd)/debian/dropbear

patch: deb-checkdir patch-stamp
patch-stamp:
	for i in `ls -1 debian/diff/*.diff || :`; do \
	  patch -p1 <$$i || exit 1; \
	done
	touch patch-stamp

config.status: patch-stamp configure
	CC='$(CC)' \
	CFLAGS='$(CFLAGS)'' -DSFTPSERVER_PATH="\"/usr/lib/sftp-server\""' \
	  ./configure --host='$(DEB_HOST_GNU_TYPE)' \
	    --build='$(DEB_BUILD_GNU_TYPE)' --prefix=/usr \
	    --mandir=\$${prefix}/share/man --infodir=\$${prefix}/share/info \
	    $(CONFFLAGS)

build: deb-checkdir build-stamp
build-stamp: config.status
	$(MAKE) CC='$(CC)' LD='$(CC)'
	touch build-stamp

clean: deb-checkdir deb-checkuid
	test ! -r Makefile || $(MAKE) distclean
	rm -f libtomcrypt/Makefile libtommath/Makefile
	test ! -e patch-stamp || \
	  for i in `ls -1r debian/diff/*.diff || :`; do \
	    patch -p1 -R <$$i; \
	  done
	rm -f patch-stamp build-stamp config.log config.status
	rm -rf '$(DIR)'
	rm -f debian/files debian/substvars debian/copyright changelog

install: deb-checkdir deb-checkuid build-stamp
	rm -rf '$(DIR)'
	install -d -m0755 '$(DIR)'/etc/dropbear
	# programs
	install -d -m0755 '$(DIR)'/usr/sbin
	install -m0755 dropbear '$(DIR)'/usr/sbin/dropbear
	install -d -m0755 '$(DIR)'/usr/bin
	install -m0755 dbclient '$(DIR)'/usr/bin/dbclient
	install -m0755 dropbearkey '$(DIR)'/usr/bin/dropbearkey
	install -d -m0755 '$(DIR)'/usr/lib/dropbear
	install -m0755 dropbearconvert \
	  '$(DIR)'/usr/lib/dropbear/dropbearconvert
	$(STRIP) -R .comment -R .note '$(DIR)'/usr/sbin/* \
	  '$(DIR)'/usr/bin/* '$(DIR)'/usr/lib/dropbear/*
	# init and run scripts
	install -d -m0755 '$(DIR)'/etc/init.d
	install -m0755 debian/dropbear.init '$(DIR)'/etc/init.d/dropbear
	install -m0755 debian/service/run '$(DIR)'/etc/dropbear/run
	install -d -m0755 '$(DIR)'/etc/dropbear/log
	install -m0755 debian/service/log '$(DIR)'/etc/dropbear/log/run
	ln -s /var/log/dropbear '$(DIR)'/etc/dropbear/log/main
	# man pages
	install -d -m0755 '$(DIR)'/usr/share/man/man8
	install -d -m0755 '$(DIR)'/usr/share/man/man1
	install -m644 dropbear.8 '$(DIR)'/usr/share/man/man8/
	for i in dbclient.1 dropbearkey.1 dropbearconvert.1; do \
	  install -m644 $$i '$(DIR)'/usr/share/man/man1/ || exit 1; \
	done
	gzip -9 '$(DIR)'/usr/share/man/man8/*.8
	gzip -9 '$(DIR)'/usr/share/man/man1/*.1
	# copyright, changelog
	cat debian/copyright.in LICENSE >debian/copyright
	test -r changelog || ln -s CHANGES changelog

binary-indep:

binary-arch: install dropbear.deb
	test '$(CC)' != 'gcc' || \
	  dpkg-shlibdeps '$(DIR)'/usr/sbin/* '$(DIR)'/usr/bin/* \
	    '$(DIR)'/usr/lib/dropbear/*
	dpkg-gencontrol -isp -pdropbear -P'$(DIR)'
	dpkg -b '$(DIR)' ..

binary: binary-arch binary-indep

.PHONY: patch build clean install binary-indep binary-arch binary

include debian/implicit