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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 e9dba7abd939
children
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line source

# MAKEFILE for linux GCC
#
# This makefile produces a shared object and requires libtool to be installed.
#
# Thanks to Zed Shaw for helping debug this on BSD/OSX.
# Tom St Denis
#
#  (GNU make only)

### USAGE:
#
# CFLAGS="-DUSE_LTM -DLTM_DESC -I/path/to/libtommath" make -f makefile.shared all EXTRALIBS=/path/to/libtommath/libtommath.a
# ./test
# make -f makefile.shared PREFIX=/opt/libtom install
#

PLATFORM := $(shell uname | sed -e 's/_.*//')

ifndef LIBTOOL
  ifeq ($(PLATFORM), Darwin)
    LIBTOOL:=glibtool
  else
    LIBTOOL:=libtool
  endif
endif
ifeq ($(PLATFORM), CYGWIN)
  NO_UNDEFINED:=-no-undefined
endif
LTCOMPILE = $(LIBTOOL) --mode=compile --tag=CC $(CC)
INSTALL_CMD = $(LIBTOOL) --mode=install install
UNINSTALL_CMD = $(LIBTOOL) --mode=uninstall rm

#Output filenames for various targets.
ifndef LIBNAME
   LIBNAME=libtomcrypt.la
endif


include makefile_include.mk


#ciphers come in two flavours... enc+dec and enc
src/ciphers/aes/aes_enc.o: src/ciphers/aes/aes.c src/ciphers/aes/aes_tab.c
	$(LTCOMPILE) $(LTC_CFLAGS) $(CPPFLAGS) $(LTC_LDFLAGS) -DENCRYPT_ONLY -c src/ciphers/aes/aes.c -o src/ciphers/aes/aes_enc.o

.c.o:
	$(LTCOMPILE) $(LTC_CFLAGS) $(CPPFLAGS) $(LTC_LDFLAGS) -o $@ -c $<

LOBJECTS = $(OBJECTS:.o=.lo)

$(LIBNAME): $(OBJECTS)
	$(LIBTOOL) --mode=link --tag=CC $(CC) $(LTC_LDFLAGS) $(LOBJECTS) $(EXTRALIBS) -o $@ -rpath $(LIBPATH) -version-info $(VERSION_LT) $(NO_UNDEFINED)

test: $(call print-help,test,Builds the library and the 'test' application to run all self-tests) $(LIBNAME) $(TOBJECTS)
	$(LIBTOOL) --mode=link --tag=CC $(CC) $(LTC_LDFLAGS) -o $(TEST) $(TOBJECTS) $(LIBNAME) $(EXTRALIBS)

# build the demos from a template
define DEMO_template
$(1): $(call print-help,$(1),Builds the library and the '$(1)' demo) demos/$(1).o $$(LIBNAME)
	$$(LIBTOOL) --mode=link --tag=CC $$(CC) $$(LTC_LDFLAGS) $$^ $$(EXTRALIBS) -o $(1)
endef

$(foreach demo, $(strip $(DEMOS)), $(eval $(call DEMO_template,$(demo))))

install: $(call print-help,install,Installs the library + headers + pkg-config file) .common_install
	sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' libtomcrypt.pc.in > libtomcrypt.pc
	install -p -d $(DESTDIR)$(LIBPATH)/pkgconfig
	install -p -m 644 libtomcrypt.pc $(DESTDIR)$(LIBPATH)/pkgconfig/

install_bins: $(call print-help,install_bins,Installs the useful demos ($(USEFUL_DEMOS))) .common_install_bins

uninstall: $(call print-help,uninstall,Uninstalls the library + headers + pkg-config file) .common_uninstall
	rm $(DESTDIR)$(LIBPATH)/pkgconfig/libtomcrypt.pc

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# git commit:  $Format:%H$
# commit time: $Format:%ai$