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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 1857c2c551ea
children
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# $Id: implicit,v 1.11 2005/11/29 21:57:55 pape Exp $

.PHONY: deb-checkdir deb-checkuid

deb-checkdir:
	@test -e debian/control || sh -cx '! : wrong directory'
deb-checkuid:
	@test "`id -u`" -eq 0 || sh -cx '! : need root privileges'

%.deb: %.deb-docs %.deb-DEBIAN
	@rm -f $*.deb $*.deb-checkdir $*.deb-docs $*.deb-docs-base \
	  $*.deb-docs-docs $*.deb-docs-examples $*.deb-DEBIAN \
	  $*.deb-DEBIAN-dir $*.deb-DEBIAN-scripts $*.deb-DEBIAN-md5sums

%.udeb: %.deb-DEBIAN
	@rm -f $*.deb $*.deb-checkdir $*.deb-DEBIAN $*.deb-DEBIAN-dir \
	  $*.deb-DEBIAN-scripts $*.deb-DEBIAN-md5sums

%.deb-checkdir:
	@test -d debian/$* || sh -cx '! : directory debian/$* missing'
	@test "`id -u`" -eq 0 || sh -cx '! : need root privileges'

%.deb-docs-base:
	: implicit
	@rm -f debian/$*/usr/share/doc/$*/* || :
	@install -d -m0755 debian/$*/usr/share/doc/$*
	: debian/$*/usr/share/doc/$*/
	@sh -cx 'install -m0644 debian/copyright debian/$*/usr/share/doc/$*/'
	@sh -cx 'install -m0644 debian/changelog \
	  debian/$*/usr/share/doc/$*/changelog.Debian'
	@test ! -r changelog || \
	  sh -cx 'install -m0644 changelog debian/$*/usr/share/doc/$*/'
	@test -r debian/$*/usr/share/doc/$*/changelog || \
	  sh -cx 'mv debian/$*/usr/share/doc/$*/changelog.Debian \
	    debian/$*/usr/share/doc/$*/changelog'
	@test -s debian/$*/usr/share/doc/$*/changelog || \
	  sh -cx 'rm -f debian/$*/usr/share/doc/$*/changelog'
	@gzip -9 debian/$*/usr/share/doc/$*/changelog*
%.deb-docs-docs:
	@for i in `cat debian/$*.docs 2>/dev/null || :`; do \
	  if test -d $$i; then \
	    sh -cx "install -d -m0755 debian/$*/usr/share/doc/$*/$${i##*/}" && \
	    for j in $$i/*; do \
	      sh -cx "install -m0644 $$j \
	        debian/$*/usr/share/doc/$*/$${i##*/}/" || exit 1; \
	    done || exit 1; \
	    continue; \
	  fi; \
	  sh -cx "install -m0644 $$i debian/$*/usr/share/doc/$*/" || exit 1; \
	done
	@test ! -r debian/$*.README.Debian || \
	  sh -cx 'install -m0644 debian/$*.README.Debian \
	    debian/$*/usr/share/doc/$*/README.Debian'
	@if test -r debian/$*.NEWS.Debian; then \
	  sh -cx 'install -m0644 debian/$*.NEWS.Debian \
	    debian/$*/usr/share/doc/$*/NEWS.Debian && \
	      gzip -9 debian/$*/usr/share/doc/$*/NEWS.Debian'; \
	fi
%.deb-docs-examples:
	@rm -rf debian/$*/usr/share/doc/$*/examples
	: debian/$*/usr/share/doc/$*/examples/
	@test ! -r debian/$*.examples || \
	  install -d -m0755 debian/$*/usr/share/doc/$*/examples
	@for i in `cat debian/$*.examples 2>/dev/null || :`; do \
	  sh -cx "install -m0644 $$i debian/$*/usr/share/doc/$*/examples/" \
	    || exit 1; \
	done
%.deb-docs: %.deb-checkdir %.deb-docs-base %.deb-docs-docs %.deb-docs-examples
	: debian/$*/usr/share/doc/$*/ ok

%.deb-DEBIAN-base:
	@rm -rf debian/$*/DEBIAN
	: debian/$*/DEBIAN/
	@install -d -m0755 debian/$*/DEBIAN
	@for i in conffiles shlibs templates; do \
	  test ! -r debian/$*.$$i || \
	    sh -cx "install -m0644 debian/$*.$$i debian/$*/DEBIAN/$$i" \
	      || exit 1; \
	done
%.deb-DEBIAN-scripts:
	@for i in preinst prerm postinst postrm config; do \
	  test ! -r debian/$*.$$i || \
	    sh -cx "install -m0755 debian/$*.$$i debian/$*/DEBIAN/$$i" \
	      || exit 1; \
	done
%.deb-DEBIAN-md5sums:
	: debian/$*/DEBIAN/md5sums
	@rm -f debian/$*/DEBIAN/md5sums
	@cd debian/$* && find * -path 'DEBIAN' -prune -o \
	  -type f -exec md5sum {} >>DEBIAN/md5sums \;
%.deb-DEBIAN: %.deb-checkdir %.deb-DEBIAN-base %.deb-DEBIAN-scripts \
	  %.deb-DEBIAN-md5sums
	: debian/$*/DEBIAN/ ok