#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# SPDX-License-Identifier: curl
#
###########################################################################
# Find the GSS Kerberos library
#
# Input variables:
#
# - `GSS_ROOT_DIR`: Absolute path to the root installation of GSS. (also supported as environment)
#
# Result variables:
#
# - `GSS_FOUND`: System has a GSS library.
# - `GSS_FLAVOUR`: "GNU" or "MIT" if anything found.
# - `GSS_INCLUDE_DIRS`: The GSS include directories.
# - `GSS_LIBRARIES`: The GSS library names.
# - `GSS_LIBRARY_DIRS`: The GSS library directories.
# - `GSS_PC_REQUIRES`: The GSS pkg-config packages.
# - `GSS_CFLAGS`: Required compiler flags.
# - `GSS_VERSION`: This is set to version advertised by pkg-config or read from manifest.
# In case the library is found but no version info available it is set to "unknown"
set(_gnu_modname "gss")
set(_mit_modname "mit-krb5-gssapi")
include(CheckIncludeFile)
include(CheckIncludeFiles)
include(CheckTypeSize)
set(_gss_root_hints "${GSS_ROOT_DIR}" "$ENV{GSS_ROOT_DIR}")
set(_gss_CFLAGS "")
set(_gss_LIBRARY_DIRS "")
# Try to find library using system pkg-config if user did not specify root dir
if(NOT GSS_ROOT_DIR AND NOT "$ENV{GSS_ROOT_DIR}")
if(CURL_USE_PKGCONFIG)
find_package(PkgConfig QUIET)
pkg_search_module(_gss ${_gnu_modname} ${_mit_modname})
list(APPEND _gss_root_hints "${_gss_PREFIX}")
set(_gss_version "${_gss_VERSION}")
endif()
if(WIN32)
list(APPEND _gss_root_hints "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MIT\\Kerberos;InstallDir]")
endif()
endif()
if(NOT _gss_FOUND) # Not found by pkg-config. Let us take more traditional approach.
find_file(_gss_configure_script NAMES "krb5-config" PATH_SUFFIXES "bin" HINTS ${_gss_root_hints}
NO_CMAKE_PATH NO_CMAKE_ENVIRONMENT_PATH)
# If not found in user-supplied directories, maybe system knows better
find_file(_gss_configure_script NAMES "krb5-config" PATH_SUFFIXES "bin")
if(_gss_configure_script)
set(_gss_INCLUDE_DIRS "")
set(_gss_LIBRARIES "")
execute_process(COMMAND ${_gss_configure_script} "--cflags" "gssapi"
OUTPUT_VARIABLE _gss_cflags_raw
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "FindGSS krb5-config --cflags: ${_gss_cflags_raw}")
if(NOT _gss_configure_failed) # 0 means success
# Should also work in an odd case when multiple directories are given.
string(STRIP "${_gss_cflags_raw}" _gss_cflags_raw)
string(REGEX REPLACE " +-(I)" ";-\\1" _gss_cflags_raw "${_gss_cflags_raw}")
string(REGEX REPLACE " +-([^I][^ \\t;]*)" ";-\\1" _gss_cflags_raw "${_gss_cflags_raw}")
foreach(_flag IN LISTS _gss_cflags_raw)
if(_flag MATCHES "^-I")
string(REGEX REPLACE "^-I" "" _flag "${_flag}")
list(APPEND _gss_INCLUDE_DIRS "${_flag}")
else()
list(APPEND _gss_CFLAGS "${_flag}")
endif()
endforeach()
endif()
execute_process(COMMAND ${_gss_configure_script} "--libs" "gssapi"
OUTPUT_VARIABLE _gss_lib_flags
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "FindGSS krb5-config --libs: ${_gss_lib_flags}")
if(NOT _gss_configure_failed) # 0 means success
# This script gives us libraries and link directories.
string(STRIP "${_gss_lib_flags}" _gss_lib_flags)
string(REGEX REPLACE " +-(L|l)" ";-\\1" _gss_lib_flags "${_gss_lib_flags}")
string(REGEX REPLACE " +-([^Ll][^ \\t;]*)" ";-\\1" _gss_lib_flags "${_gss_lib_flags}")
foreach(_flag IN LISTS _gss_lib_flags)
if(_flag MATCHES "^-l")
string(REGEX REPLACE "^-l" "" _flag "${_flag}")
list(APPEND _gss_LIBRARIES "${_flag}")
elseif(_flag MATCHES "^-L")
string(REGEX REPLACE "^-L" "" _flag "${_flag}")
list(APPEND _gss_LIBRARY_DIRS "${_flag}")
endif()
endforeach()
endif()
execute_process(COMMAND ${_gss_configure_script} "--version"
OUTPUT_VARIABLE _gss_version
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Older versions may not have the "--version" parameter. In this case we just do not care.
if(_gss_configure_failed)
set(_gss_version 0)
else()
# Strip prefix string to leave the version number only
string(REPLACE "Kerberos 5 release " "" _gss_version "${_gss_version}")
endif()
execute_process(COMMAND ${_gss_configure_script} "--vendor"
OUTPUT_VARIABLE _gss_vendor
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Older versions may not have the "--vendor" parameter. In this case we just do not care.
if(NOT _gss_configure_failed AND NOT _gss_vendor MATCHES "Heimdal|heimdal")
set(GSS_FLAVOUR "MIT") # assume a default, should not really matter
endif()
else() # Either there is no config script or we are on a platform that does not provide one (Windows?)
find_path(_gss_INCLUDE_DIRS NAMES "gssapi/gssapi.h" HINTS ${_gss_root_hints} PATH_SUFFIXES "include" "inc")
if(_gss_INCLUDE_DIRS) # We have found something
set(_gss_libdir_suffixes "")
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_INCLUDES "${_gss_INCLUDE_DIRS}")
check_include_files("gssapi/gssapi_generic.h;gssapi/gssapi_krb5.h" _gss_have_mit_headers)
cmake_pop_check_state()
if(_gss_have_mit_headers)
set(GSS_FLAVOUR "MIT")
if(WIN32)
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
list(APPEND _gss_libdir_suffixes "lib/AMD64")
set(_gss_libname "gssapi64")
else()
list(APPEND _gss_libdir_suffixes "lib/i386")
set(_gss_libname "gssapi32")
endif()
else()
list(APPEND _gss_libdir_suffixes "lib" "lib64") # those suffixes are not checked for HINTS
set(_gss_libname "gssapi_krb5")
endif()
endif()
else()
find_path(_gss_INCLUDE_DIRS NAMES "gss.h" HINTS ${_gss_root_hints} PATH_SUFFIXES "include")
if(_gss_INCLUDE_DIRS)
set(GSS_FLAVOUR "GNU")
set(GSS_PC_REQUIRES ${_gnu_modname})
set(_gss_libname "gss")
endif()
endif()
# If we have headers, look up libraries
if(GSS_FLAVOUR)
set(_gss_libdir_hints ${_gss_root_hints})
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.20)
cmake_path(GET _gss_INCLUDE_DIRS PARENT_PATH _gss_calculated_potential_root)
else()
get_filename_component(_gss_calculated_potential_root "${_gss_INCLUDE_DIRS}" DIRECTORY)
endif()
list(APPEND _gss_libdir_hints ${_gss_calculated_potential_root})
find_library(_gss_LIBRARIES NAMES ${_gss_libname} HINTS ${_gss_libdir_hints} PATH_SUFFIXES ${_gss_libdir_suffixes})
endif()
endif()
if(NOT GSS_FLAVOUR)
message(FATAL_ERROR "GNU or MIT GSS is required")
endif()
else()
# _gss_MODULE_NAME set since CMake 3.16.
# _pkg_check_modules_pkg_name is undocumented and used as a fallback for CMake <3.16 versions.
if(_gss_MODULE_NAME STREQUAL _gnu_modname OR _pkg_check_modules_pkg_name STREQUAL _gnu_modname)
set(GSS_FLAVOUR "GNU")
set(GSS_PC_REQUIRES ${_gnu_modname})
elseif(_gss_MODULE_NAME STREQUAL _mit_modname OR _pkg_check_modules_pkg_name STREQUAL _mit_modname)
set(GSS_FLAVOUR "MIT")
set(GSS_PC_REQUIRES ${_mit_modname})
else()
message(FATAL_ERROR "GNU or MIT GSS is required")
endif()
message(STATUS "Found GSS/${GSS_FLAVOUR} (via pkg-config): ${_gss_INCLUDE_DIRS} (found version \"${_gss_version}\")")
endif()
string(REPLACE ";" " " _gss_CFLAGS "${_gss_CFLAGS}")
set(GSS_INCLUDE_DIRS ${_gss_INCLUDE_DIRS})
set(GSS_LIBRARIES ${_gss_LIBRARIES})
set(GSS_LIBRARY_DIRS ${_gss_LIBRARY_DIRS})
set(GSS_CFLAGS ${_gss_CFLAGS})
set(GSS_VERSION ${_gss_version})
if(NOT GSS_VERSION)
if(GSS_FLAVOUR STREQUAL "MIT")
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.24)
cmake_host_system_information(RESULT _mit_version QUERY WINDOWS_REGISTRY
"HKLM/SOFTWARE/MIT/Kerberos/SDK/CurrentVersion" VALUE "VersionString")
else()
get_filename_component(_mit_version
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MIT\\Kerberos\\SDK\\CurrentVersion;VersionString]" NAME CACHE)
endif()
if(WIN32 AND _mit_version)
set(GSS_VERSION "${_mit_version}")
else()
set(GSS_VERSION "MIT Unknown")
endif()
else() # GNU
if(GSS_INCLUDE_DIRS AND EXISTS "${GSS_INCLUDE_DIRS}/gss.h")
set(_version_regex "#[\t ]*define[\t ]+GSS_VERSION[\t ]+\"([^\"]*)\"")
file(STRINGS "${GSS_INCLUDE_DIRS}/gss.h" _version_str REGEX "${_version_regex}")
string(REGEX REPLACE "${_version_regex}" "\\1" _version_str "${_version_str}")
set(GSS_VERSION "${_version_str}")
unset(_version_regex)
unset(_version_str)
endif()
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GSS
REQUIRED_VARS
GSS_FLAVOUR
GSS_LIBRARIES
VERSION_VAR
GSS_VERSION
FAIL_MESSAGE
"Could NOT find GSS, try to set the absolute path to GSS installation root directory in the environment variable GSS_ROOT_DIR"
)
mark_as_advanced(
_gss_CFLAGS
_gss_FOUND
_gss_INCLUDE_DIRS
_gss_LIBRARIES
_gss_LIBRARY_DIRS
_gss_MODULE_NAME
_gss_PREFIX
_gss_version
)