Mercurial > dropbear
view debian/rules @ 1790:42745af83b7d
Introduce extra delay before closing unauthenticated sessions
To make it harder for attackers, introduce a delay to keep an
unauthenticated session open a bit longer, thus blocking a connection
slot until after the delay.
Without this, while there is a limit on the amount of attempts an attacker
can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to
handle one attempt is still short and thus for each of the allowed parallel
attempts many attempts can be chained one after the other. The attempt rate
is then:
"MAX_UNAUTH_PER_IP / <process time of one attempt>".
With the delay, this rate becomes:
"MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author | Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> |
---|---|
date | Wed, 15 Feb 2017 13:53:04 +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