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#!/bin/sh -e
#
# Copyright (c) 2005-2007 The OpenSSL Project.
#
# Depending on output file name, the script either embeds fingerprint
# into libcrypto.so or static application. "Static" refers to static
# libcrypto.a, not [necessarily] application per se.
#
# Even though this script is called fipsld, it expects C compiler
# command line syntax and $FIPSLD_CC or $CC environment variable set
# and can even be used to compile source files.

#set -x

CC=${FIPSLD_CC:-${CC}}
[ -n "${CC}" ] || { echo '$CC is not defined'; exit 1; }

# Initially -c wasn't intended to be interpreted here, but it might
# make life easier for those who want to build FIPS-ified applications
# with minimal [if any] modifications to their Makefiles...
(   while [ "x$1" != "x" -a "x$1" != "x-c" -a "x$1" != "x-E" ]; do shift; done;
    [ $# -ge 1 ]
) && exec ${CC} "$@"

TARGET=`(while [ "x$1" != "x" -a "x$1" != "x-o" ]; do shift; done; echo $2)`

# If using an auto-tooled (autoconf/automake/libtool) project,
# configure will fail when testing the compiler or even performing
# simple checks. Pass-through to compiler directly if application is
# is not being linked with libcrypto, allowing auto-tooled applications
# to utilize fipsld (e.g. CC=/usr/local/ssl/bin/fipsld FIPSLD_CC=gcc
# ./configure && make). But keep in mind[!] that if certified code
# resides in a shared library, then fipsld *may not* be used and
# end-developer should not modify application configuration and build
# procedures. This is because in-core fingerprint and associated
# procedures are already embedded into and executed in shared library
# context.
case `basename "${TARGET}"` in
libcrypto*|libfips*|*.dll)		;;
*)	case "$*" in
	*libcrypto.a*|*-lcrypto*|*fipscanister.o*)	;;
	*)	exec ${CC} "$@"		;;
	esac
esac

[ -n "${TARGET}" ] || { echo 'no -o specified'; exit 1; }

# Turn on debugging output?
(   while [ "x$1" != "x" -a "x$1" != "x-DDEBUG_FINGERPRINT_PREMAIN" ]; do shift; done;
    [ $# -ge 1 ]
) && set -x

THERE="`echo $0 | sed -e 's|[^/]*$||'`"..

# fipscanister.o can appear in command line
CANISTER_O=`(while [ "x$1" != "x" ]; do case "$1" in *fipscanister.o) echo $1; exit;; esac; shift; done)`
if [ -z "${CANISTER_O}" ]; then
	# If set, FIPSLIBDIR is location of installed validated FIPS module
	if [ -n "${FIPSLIBDIR}" ]; then
		CANISTER_O="${FIPSLIBDIR}/fipscanister.o"
	elif [ -f "${THERE}/fips/fipscanister.o" ]; then
		CANISTER_O="${THERE}/fips/fipscanister.o"
	elif [ -f "${THERE}/lib/fipscanister.o" ]; then
		CANISTER_O="${THERE}/lib/fipscanister.o"
	fi
	CANISTER_O_CMD="${CANISTER_O}"
fi
[ -f ${CANISTER_O} ] || { echo "unable to find ${CANISTER_O}"; exit 1; }

PREMAIN_C=`dirname "${CANISTER_O}"`/fips_premain.c

HMAC_KEY="etaonrishdlcupfm"

case "`(uname -s) 2>/dev/null`" in
OSF1|IRIX*)	_WL_PREMAIN="-Wl,-init,FINGERPRINT_premain"	;;
HP-UX)		_WL_PREMAIN="-Wl,+init,FINGERPRINT_premain"	;;
AIX)		_WL_PREMAIN="-Wl,-binitfini:FINGERPRINT_premain,-bnoobjreorder";;
Darwin)		(   while [ "x$1" != "x" -a "x$1" != "x-dynamiclib" ]; do shift; done;
		    [ $# -ge 1 ]
		) && _WL_PREMAIN="-Wl,-init,_FINGERPRINT_premain" ;;
esac

case "${TARGET}" in
[!/]*)	TARGET=./${TARGET} ;;
esac

case `basename "${TARGET}"` in
lib*|*.dll)	# must be linking a shared lib...
	# Shared lib creation can be taking place in the source
	# directory only, but fipscanister.o can reside elsewhere...
	FINGERTYPE="${THERE}/fips/fips_standalone_sha1"

	# verify fipspremain.c against its detached signature...
	${FINGERTYPE} "${PREMAIN_C}" | sed "s/(.*\//(/" | \
		diff -w "${PREMAIN_C}.sha1" - || \
	{ echo "${PREMAIN_C} fingerprint mismatch"; exit 1; }
	# verify fipscanister.o against its detached signature...
	${FINGERTYPE} "${CANISTER_O}" | sed "s/(.*\//(/" | \
		diff -w "${CANISTER_O}.sha1" - || \
	{ echo "${CANISTER_O} fingerprint mismatch"; exit 1; }

	# Temporarily remove fipscanister.o from libcrypto.a!
	# We are required to use the standalone copy...
	if [ -f "${THERE}/libcrypto.a" ]; then
	    if ar d "${THERE}/libcrypto.a" fipscanister.o; then
		(ranlib "${THERE}/libcrypto.a") 2>/dev/null || :
		trap	'ar r "${THERE}/libcrypto.a" "${CANISTER_O}";
			 (ranlib "${THERE}/libcrypto.a") 2>/dev/null || :;
			 sleep 1;
			 touch -c "${TARGET}"' 0
	    fi
	fi

	/bin/rm -f "${TARGET}"
	${CC}	${CANISTER_O_CMD:+"${CANISTER_O_CMD}"} \
		"${PREMAIN_C}" \
		${_WL_PREMAIN} "$@"

	# generate signature...
	SIG=`"${THERE}/fips/fips_premain_dso" "${TARGET}"`
	/bin/rm -f "${TARGET}"
	if [ -z "${SIG}" ]; then
	   echo "unable to collect signature"; exit 1
	fi

	# recompile with signature...
	${CC}	${CANISTER_O_CMD:+"${CANISTER_O_CMD}"} \
		-DHMAC_SHA1_SIG=\"${SIG}\" "${PREMAIN_C}" \
		${_WL_PREMAIN} "$@"
	;;

*)	# must be linking statically...
	# Static linking can be taking place either in the source
	# directory or off the installed binary target destination.
	if [ -x "${THERE}/fips/fips_standalone_sha1" ]; then
		FINGERTYPE="${THERE}/fips/fips_standalone_sha1"
	else	# Installed tree is expected to contain
		# lib/fipscanister.o, lib/fipscanister.o.sha1 and
		# lib/fips_premain.c [not to mention bin/openssl].
		FINGERTYPE="${THERE}/bin/openssl sha1 -hmac ${HMAC_KEY}"
	fi

	# verify fipscanister.o against its detached signature...
	${FINGERTYPE} "${CANISTER_O}" | sed "s/(.*\//(/" | \
		diff -w "${CANISTER_O}.sha1" - || \
	{ echo "${CANISTER_O} fingerprint mismatch"; exit 1; }

	# verify fips_premain.c against its detached signature...
	${FINGERTYPE} "${PREMAIN_C}" | sed "s/(.*\//(/" | \
		diff -w "${PREMAIN_C}.sha1" - || \
	{ echo "${PREMAIN_C} fingerprint mismatch"; exit 1; }

	/bin/rm -f "${TARGET}"
	${CC}	${CANISTER_O_CMD:+"${CANISTER_O_CMD}"} \
		"${PREMAIN_C}" \
		${_WL_PREMAIN} "$@"

	# generate signature...
	SIG=`"${TARGET}"`
	/bin/rm -f "${TARGET}"
	if [ -z "${SIG}" ]; then
	   echo "unable to collect signature"; exit 1
	fi

	# recompile with signature...
	${CC}	${CANISTER_O_CMD:+"${CANISTER_O_CMD}"} \
		-DHMAC_SHA1_SIG=\"${SIG}\" "${PREMAIN_C}" \
		${_WL_PREMAIN} "$@"
	;;
esac