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kea/m4macros/ax_crypto.m4
Francis Dupont d3ca06b7b6 [#1614] Checkpoint: ported HMAC to EVP
2022-06-24 17:37:29 +02:00

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# Simplified, non-caching AC_CHECK_PROG
# Searches $PATH for the existence of argument 2,
# and sets the full path to the variable in argument 1.
# if not found, and a third argument is given, the value
# is set to that. If not, the value is untouched.
# Does not take absolute paths into account at this point,
# and also works for single files only (arguments are not
# stripped like in AC_CHECK_PROG)
AC_DEFUN([ACX_CHECK_PROG_NONCACHE], [
RESULT=""
IFS_SAVED="$IFS"
IFS=${PATH_SEPARATOR}
for cur_path in ${PATH} ; do
if test -e "${cur_path}/$2" ; then
RESULT="${cur_path}/$2"
fi
done
if test "$RESULT" = "" ; then
:
m4_ifvaln([$3], [$1=$3])
else
$1=$RESULT
fi
IFS="$IFS_SAVED"
])
AC_DEFUN([ACX_TRY_BOTAN_TOOL], [
TOOL=$1
TOOL_ARG=$2
BOTAN_TOOL=""
ACX_CHECK_PROG_NONCACHE([BOTAN_TOOL], [${TOOL}])
AC_MSG_CHECKING([usability of ${TOOL} ${TOOL_ARG}])
if test "$BOTAN_TOOL" != "" ; then
if test -x ${BOTAN_TOOL}; then
CRYPTO_LIBS=`$BOTAN_TOOL $TOOL_ARG --libs`
LIBS_SAVED=${LIBS}
LIBS="$LIBS $CRYPTO_LIBS"
CRYPTO_INCLUDES=`$BOTAN_TOOL $TOOL_ARG --cflags`
CPPFLAGS_SAVED=${CPPFLAGS}
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
#AC_MSG_RESULT([found])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <botan/lookup.h>],
[using namespace Botan;
HashFunction *h = HashFunction::create("MD5").release();
])],
[ AC_MSG_RESULT([ok])
$3
],
[ AC_MSG_RESULT([not usable]) ]
)
LIBS=${LIBS_SAVED}
CPPFLAGS=${CPPFLAGS_SAVED}
else
AC_MSG_RESULT([not executable])
fi
else
AC_MSG_RESULT([not found])
fi
BOTAN_TOOL=""
AC_SUBST(BOTAN_TOOL)
]
)
# End of ACX_TRY_BOTAN_TOOL
AC_DEFUN([AX_CRYPTO], [
# Check for Botan
#
# Unless --with-botan-config is given, we first try to find these config
# scripts ourselves. Unfortunately, on some systems, these scripts do not
# provide the correct implementation, so for each script found, we try
# a compilation test (ACX_TRY_BOTAN_TOOL). If none are found, or none of
# them work, we see if pkg-config is available. If so, we try the several
# potential pkg-config .pc files. Again, on some systems, these can return
# incorrect information as well, so the try-compile test is repeated for
# each.
#
# If a working config script or pkgconfig file is found, we then munge its
# output for use in our Makefiles, and to make sure it works, another header
# and compilation test is done (this should also check whether we can compile
# against botan should neither -config scripts nor pkgconfig data exist).
#
# Avoid checking Botan if OpenSSL is wanted
AC_ARG_WITH([openssl],
[AS_HELP_STRING([--with-openssl[[=PATH]]], [Enables OpenSSL,
location can be specified optionally])],
[use_openssl="$withval"],
[use_openssl="auto"])
botan_config="yes"
if test "${use_openssl}" != "auto" -a "${use_openssl}" != "no" ; then
botan_config="no"
fi
AC_ARG_WITH([botan-config],
[AS_HELP_STRING([--with-botan-config=PATH],
[specify the path to the botan-config script])],
[botan_config="$withval"])
distcheck_botan="--with-botan-config=$botan_config"
if test "${botan_config}" = "no" ; then
if test "${use_openssl}" = "no" ; then
AC_MSG_ERROR([Need Botan or OpenSSL for libcryptolink])
fi
elif test "${botan_config}" != "yes" ; then
if test -x "${botan_config}" ; then
if test -d "${botan_config}" ; then
AC_MSG_ERROR([${botan_config} is a directory])
fi
else
AC_MSG_ERROR([--with-botan-config should point to a botan-config program and not a directory (${botan_config})])
fi
else
BOTAN_CONFIG=""
AC_PATH_PROG([PKG_CONFIG], [pkg-config])
if test "$PKG_CONFIG" != "" ; then
BOTAN_VERSIONS="botan-2"
for version in $BOTAN_VERSIONS; do
ACX_TRY_BOTAN_TOOL([pkg-config], ["$version --silence-errors"],
[ BOTAN_CONFIG="$PKG_CONFIG $version" ]
)
if test "$BOTAN_CONFIG" != "" ; then
break
fi
done
fi
fi
if test "$BOTAN_CONFIG" != ""
then
CRYPTO_LIBS=`${BOTAN_CONFIG} --libs`
CRYPTO_INCLUDES=`${BOTAN_CONFIG} --cflags`
# We expect botan-config --libs to contain -L<path_to_libbotan>, but
# this is not always the case. As a heuristics workaround we add
# -L`botan-config --prefix/lib` in this case (if not present already).
# Same for CRYPTO_INCLUDES (but using include instead of lib) below.
if [ ${BOTAN_CONFIG} --prefix >/dev/null 2>&1 ] ; then
echo ${CRYPTO_LIBS} | grep -- -L > /dev/null || \
CRYPTO_LIBS="-L`${BOTAN_CONFIG} --prefix`/lib ${CRYPTO_LIBS}"
echo ${CRYPTO_INCLUDES} | grep -- -I > /dev/null || \
CRYPTO_INCLUDES="-I`${BOTAN_CONFIG} --prefix`/include ${CRYPTO_INCLUDES}"
fi
fi
if test "x${CRYPTO_LIBS}" != "x"
then
dnl Determine the Botan version
AC_MSG_CHECKING([Botan version])
cat > conftest.cpp << EOF
#include <botan/version.h>
AUTOCONF_BOTAN_VERSION=BOTAN_VERSION_MAJOR . BOTAN_VERSION_MINOR . BOTAN_VERSION_PATCH
EOF
CRYPTO_VERSION=`$CPPP $CPPFLAGS $CRYPTO_INCLUDES conftest.cpp | grep '^AUTOCONF_BOTAN_VERSION=' | $SED -e 's/^AUTOCONF_BOTAN_VERSION=//' -e 's/[[ ]]//g' -e 's/"//g' 2> /dev/null`
if test -z "$CRYPTO_VERSION"; then
CRYPTO_VERSION="unknown"
fi
$RM -f conftest.cpp
AC_MSG_RESULT([$CRYPTO_VERSION])
# botan-config script (and the way we call pkg-config) returns -L and -l
# as one string, but we need them in separate values
CRYPTO_LDFLAGS=
for flag in ${CRYPTO_LIBS}; do
CRYPTO_LDFLAGS="${CRYPTO_LDFLAGS} `echo $flag | ${SED} -ne '/^\(\-L\)/p'`"
CRYPTO_LIBS="${CRYPTO_LIBS} `echo $flag | ${SED} -ne '/^\(\-l\)/p'`"
done
# # check -R, "-Wl,-R" or -rpath
AX_ISC_RPATH
# See crypto_rpath for some info on why we do this
if test "x$ISC_RPATH_FLAG" != "x"; then
CRYPTO_RPATH=
for flag in ${CRYPTO_LIBS}; do
CRYPTO_RPATH="${CRYPTO_RPATH} `echo $flag | ${SED} -ne "s/^\(\-L\)/${ISC_RPATH_FLAG}/p"`"
done
# According to the libtool manual, it should be sufficient if we
# specify the "-R libdir" in our wrapper library of botan (no other
# programs will need libbotan directly); "libdir" should be added to
# the program's binary image. But we've seen in our build environments
# that (some versions of?) libtool doesn't propagate -R as documented,
# and it caused a linker error at run time. To work around this, we
# also add the rpath to the global LDFLAGS.
LDFLAGS="$CRYPTO_RPATH $LDFLAGS"
fi
# Even though chances are high we already performed a real compilation check
# in the search for the right (pkg)config data, we try again here, to
# be sure.
CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
LIBS_SAVED="$LIBS"
LIBS="$LIBS $CRYPTO_LIBS"
# ac_header_preproc is an autoconf symbol (undocumented but stable) that
# is set if the pre-processor phase passes. Thus by adding a custom
# failure handler we can detect the difference between a header not existing
# (or not even passing the pre-processor phase) and a header file resulting
# in compilation failures.
AC_CHECK_HEADERS([botan/botan.h],,[
CRYPTO_INCLUDES=""
CRYPTO_LIBS=""
CRYPTO_LDFLAGS=""
CRYPTO_RPATH=""
if test "x$ac_header_preproc" = "xyes"; then
AC_MSG_RESULT([botan/botan.h
was found but is unusable. The most common cause of this problem
is attempting to use an updated C++ compiler with older C++ libraries, such as
the version of Botan that comes with your distribution. If you have updated
your C++ compiler we highly recommend that you use support libraries such as
Boost and Botan that were compiled with the same compiler version.])
else
AC_MSG_RESULT([Missing required libcrypto header files])
fi]
)
CPPFLAGS=$CPPFLAGS_SAVED
LIBS=$LIBS_SAVED
fi
if test "x${CRYPTO_LIBS}" != "x"
then
CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
LIBS_SAVED="$LIBS"
LIBS="$LIBS $CRYPTO_LIBS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <botan/lookup.h>],
[using namespace Botan;
HashFunction *h = HashFunction::create("MD5")
.release();
])],
[AC_MSG_RESULT([checking for Botan library... yes])],
[AC_MSG_RESULT([checking for Botan library... no])
CRYPTO_INCLUDES=""
CRYPTO_LIBS=""
CRYPTO_LDFLAGS=""
CRYPTO_RPATH=""
AC_MSG_RESULT([Needs Botan library 2.0 or higher. On some systems,
the botan package has a few missing dependencies (libbz2 and
libgmp), if libbotan has been installed and you see this message,
try upgrading to a higher version of botan or installing libbz2
and libgmp.])]
)
CPPFLAGS=$CPPFLAGS_SAVED
LIBS=$LIBS_SAVED
CRYPTO_NAME="Botan"
CRYPTO_PACKAGE="botan-2"
fi
if test "x${CRYPTO_LIBS}" != "x"
then
DISABLED_CRYPTO="OpenSSL"
CRYPTO_CFLAGS=""
DISTCHECK_CRYPTO_CONFIGURE_FLAG="$distcheck_botan"
AC_DEFINE_UNQUOTED([WITH_BOTAN], [], [Compile with Botan crypto])
else
CRYPTO_NAME="OpenSSL"
DISABLED_CRYPTO="Botan"
CRYPTO_PACKAGE="openssl-1.1.0"
DISTCHECK_CRYPTO_CONFIGURE_FLAG="--with-openssl=${use_openssl}"
AC_DEFINE_UNQUOTED([WITH_OPENSSL], [], [Compile with OpenSSL crypto])
AC_MSG_CHECKING(for OpenSSL library)
openssl_headers=
openssl_libraries=
case "${use_openssl}" in
auto)
use_openssl="yes"
;;
yes)
;;
*)
# no was already handled
openssl_headers="${use_openssl}/include"
openssl_libraries="${use_openssl}/lib"
;;
esac
# Now search for the system OpenSSL library.
if test "${use_openssl}" = "yes" ; then
for d in /usr /usr/local /usr/local/ssl /usr/local/opt/openssl /usr/pkg /usr/sfw; do
if test -f $d/include/openssl/opensslv.h; then
use_openssl="${d}"
openssl_headers="${d}/include"
for l in lib lib64; do
if test -f "${d}/${l}/libssl.so"; then
openssl_libraries="${d}/${l}"
break
fi
done
if test -n "${openssl_headers}" && test -n "${openssl_libraries}"; then
break
fi
fi
done
fi
if test "${use_openssl}" = "yes" ; then
AC_MSG_ERROR([OpenSSL auto detection failed])
fi
AC_MSG_RESULT(yes)
if test "${openssl_headers}" = "/usr/include" ; then
CRYPTO_CFLAGS=""
CRYPTO_INCLUDES=""
CRYPTO_LIBS="-lssl -lcrypto"
else
CRYPTO_CFLAGS=""
CRYPTO_INCLUDES="-I${openssl_headers}"
case $host in
*-solaris*)
CRYPTO_LIBS="-L${openssl_libraries} -R${openssl_libraries} -lssl -lcrypto"
;;
*-hp-hpux*)
CRYPTO_LIBS="-L${openssl_libraries} -Wl,+b: -lssl -lcrypto"
;;
*-apple-darwin*)
if test -f "${openssl_libraries}/libcrypto.dylib" ; then
CRYPTO_LIBS="-L${openssl_libraries} -lssl -lcrypto"
else
CRYPTO_LIBS="${openssl_libraries}/libssl.a ${openssl_libraries}/libcrypto.a"
fi
;;
*)
CRYPTO_LIBS="-L${openssl_libraries} -lssl -lcrypto"
;;
esac
fi
dnl Determine the OpenSSL version
# Officially we support >= 1.0.1, 0.9.8 should fail the HMAC API,
# 1.0.0 could work but is not recommended.
AC_MSG_CHECKING([OpenSSL version])
cat > conftest.cpp << EOF
#include <openssl/opensslv.h>
AUTOCONF_OPENSSL_VERSION=OPENSSL_VERSION_TEXT
EOF
CRYPTO_VERSION=`$CPPP $CPPFLAGS $CRYPTO_INCLUDES conftest.cpp | grep '^AUTOCONF_OPENSSL_VERSION=' | $SED -e 's/^AUTOCONF_OPENSSL_VERSION=//' -e 's/"//g' 2> /dev/null`
if test -z "$CRYPTO_VERSION" ; then
CRYPTO_VERSION="unknown"
fi
$RM -f conftest.cpp
AC_MSG_RESULT([$CRYPTO_VERSION])
#CRYPTO_LDFLAGS="-ldl"
CRYPTO_LDFLAGS=""
CRYPTO_RPATH=""
AC_MSG_CHECKING([support of SHA-2])
LIBS_SAVED=${LIBS}
LIBS="$LIBS $CRYPTO_LIBS"
CPPFLAGS_SAVED=${CPPFLAGS}
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
dnl Check availability of legacy hash
AC_CHECK_FUNC([EVP_md5],,[missing EVP entry for MD5])
AC_CHECK_FUNC([EVP_sha1],,[missing EVP entry for SHA1])
dnl Check availability of SHA-2
AC_CHECK_FUNC([EVP_sha224],,[missing EVP entry for SHA224])
AC_CHECK_FUNC([EVP_sha256],,[missing EVP entry for SHA256])
AC_CHECK_FUNC([EVP_sha384],,[missing EVP entry for SHA384])
AC_CHECK_FUNC([EVP_sha512],,[missing EVP entry for SHA512])
dnl Two generations of EVP_MD_CTX functions
AC_CHECK_FUNCS([EVP_MD_CTX_new EVP_MD_CTX_free],,
[AC_CHECK_FUNCS([EVP_MD_CTX_create EVP_MD_CTX_destroy],,
[AC_MSG_ERROR([missing EVP MD CTX functions])])])
dnl Same for EVP and HMAC
AC_CHECK_FUNCS([EVP_PKEY_new_raw_private_key],,
[AC_CHECK_FUNCS([EVP_PKEY_new_mac_key],,
[AC_MSG_ERROR([missing EVP PKEY new key function])])])
LIBS=${LIBS_SAVED}
CPPFLAGS=${CPPFLAGS_SAVED}
fi
AM_CONDITIONAL(HAVE_BOTAN, test "$CRYPTO_NAME" = "Botan")
AM_CONDITIONAL(HAVE_OPENSSL, test "$CRYPTO_NAME" = "OpenSSL")
AC_SUBST(CRYPTO_INCLUDES)
AC_SUBST(CRYPTO_CFLAGS)
AC_SUBST(CRYPTO_LIBS)
AC_SUBST(CRYPTO_LDFLAGS)
AC_SUBST(CRYPTO_PACKAGE)
AC_SUBST(CRYPTO_RPATH)
AC_SUBST(DISTCHECK_CRYPTO_CONFIGURE_FLAG)
]
)
# End of AX_CRYPTO
# Test TLS support using both crypto and boost.
AC_DEFUN([AX_TLS], [
if test "x${CRYPTO_NAME}" = "xBotan"
then
dnl Check Botan boost ASIO TLS
CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS $BOOST_INCLUDES"
BOTAN_BOOST=""
AC_CHECK_HEADERS([botan/asio_stream.h],
[BOTAN_BOOST="maybe"
AC_MSG_CHECKING([Botan boost TLS support])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <botan/asio_stream.h>],
[#ifndef BOTAN_TLS_SERVER_H_
#error botan/tls_server.h is not included by botan/asio_stream.h
#endif])],
[AC_MSG_RESULT(yes)
BOTAN_BOOST="yes"
AC_DEFINE([WITH_BOTAN_BOOST], [1],
[Define to 1 if Botan boost TLS is available])],
[AC_MSG_RESULT(no)
BOTAN_BOOST="no"
AC_MSG_WARN([Botan is configured with boost support but is too old: only Botan >= 2.14.0 can be used for TLS support.])])],
[BOTAN_BOOST="no"
AC_MSG_WARN([Botan cannot be used for TLS support, because it was compiled without boost support, so required headers are missing.])])
CPPFLAGS=${CPPFLAGS_SAVED}
fi
if test "x${CRYPTO_NAME}" = "xOpenSSL"
then
CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS $BOOST_INCLUDES"
dnl Check boost ASIO SSL
AC_CHECK_HEADERS([boost/asio/ssl.hpp],,
[AC_MSG_ERROR([Missing required boost ssl header file])])
dnl Check if the generic TLS method is available
AC_MSG_CHECKING([Generic TLS method])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <boost/asio/ssl.hpp>],
[auto ctx(boost::asio::ssl::context::tls);])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_GENERIC_TLS_METHOD], [1],
[Define to 1 if boost::asio::ssl::context::tls is available])],
[AC_MSG_RESULT(no)
AC_MSG_CHECKING([Verifying TLS 1.2 fallback])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <boost/asio/ssl.hpp>],
[auto ctx(boost::asio::ssl::context::tlsv12);])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_TLS_1_2_METHOD], [1],
[Define to 1 if boost::asio::ssl::context::tlsv12 is available])],
[AC_MSG_RESULT(no)
AC_MSG_WARN([The boost version is very old: TLS support can use insecure features])])])
dnl Check if the stream_truncated (SSL short read) error is available
AC_MSG_CHECKING([stream_truncated (SSL short read) error])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <boost/asio/ssl.hpp>],
[const int ec =
boost::asio::ssl::error::stream_truncated;])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_STREAM_TRUNCATED_ERROR], [1],
[Define to 1 if boost::asio::ssl::error::stream_truncated is available])],
[AC_MSG_RESULT(no)
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <boost/asio/ssl.hpp>],
[const int ec =
ERR_PACK(ERR_LIB_SSL, 0, SSL_R_SHORT_READ);])],
[],
[AC_MSG_ERROR([Can not find a definition for stream_truncated (SSL short read) error: sorry, your boost library is too old])])])
CPPFLAGS=${CPPFLAGS_SAVED}
fi
AM_CONDITIONAL(HAVE_BOTAN_BOOST,
test "$CRYPTO_NAME" = "Botan" && test "$BOTAN_BOOST" = "yes")
])
# End of AX_TLS
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