Cmake: Build with GSSAPI (MIT or Heimdal)

It tries hard to recognise SDK's on different platforms. On windows MIT
Kerberos installs SDK with other things and puts path into registry.
Heimdal have separate zip archive. On linux pkg-config is tried, then
krb5-config script and finally old-style libs and headers detection.

Command line args:
* CMAKE_USE_GSSAPI - enables GSSAPI detection
* GSS_ROOT_DIR - if set, should point to the root of GSSAPI installation
                 (the one with include and lib directories)

3 files changed, 356 insertions, 12 deletions

diff --git a/CMake/FindGSS.cmake b/CMake/FindGSS.cmake
new file mode 100644
index 000000000..4986a8e09
--- /dev/null
+++ b/CMake/FindGSS.cmake
@@ -0,0 +1,289 @@
+# - Try to find the GSS Kerberos library
+# Once done this will define
+#
+#  GSS_ROOT_DIR - Set this variable to the root installation of GSS
+#
+# Read-Only variables:
+#  GSS_FOUND - system has the Heimdal library
+#  GSS_FLAVOUR - "MIT" or "Heimdal" if anything found.
+#  GSS_INCLUDE_DIR - the Heimdal include directory
+#  GSS_LIBRARIES - The libraries needed to use GSS
+#  GSS_LINK_DIRECTORIES - Directories to add to linker search path
+#  GSS_LINKER_FLAGS - Additional linker flags
+#  GSS_COMPILER_FLAGS - Additional 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 availabe it'll be set to "unknown"
+
+set(_MIT_MODNAME mit-krb5-gssapi)
+set(_HEIMDAL_MODNAME heimdal-gssapi)
+
+include(CheckIncludeFile)
+include(CheckIncludeFiles)
+include(CheckTypeSize)
+
+set(_GSS_ROOT_HINTS
+    "${GSS_ROOT_DIR}"
+    "$ENV{GSS_ROOT_DIR}"
+)
+
+# try to find library using system pkg-config if user didn't specify root dir
+if(NOT GSS_ROOT_DIR AND NOT "$ENV{GSS_ROOT_DIR}")
+    if(UNIX)
+        find_package(PkgConfig QUIET)
+        pkg_search_module(_GSS_PKG ${_MIT_MODNAME} ${_HEIMDAL_MODNAME})
+        list(APPEND _GSS_ROOT_HINTS "${_GSS_PKG_PREFIX}")
+    elseif(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's take more traditional approach.
+    find_file(_GSS_CONFIGURE_SCRIPT
+        NAMES
+            "krb5-config"
+        HINTS
+            ${_GSS_ROOT_HINTS}
+        PATH_SUFFIXES
+            bin
+        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)
+        execute_process(
+            COMMAND ${_GSS_CONFIGURE_SCRIPT} "--cflags" "gssapi"
+            OUTPUT_VARIABLE _GSS_CFLAGS
+            RESULT_VARIABLE _GSS_CONFIGURE_FAILED
+        )
+message(STATUS "CFLAGS: ${_GSS_CFLAGS}")
+        if(NOT _GSS_CONFIGURE_FAILED) # 0 means success
+            # should also work in an odd case when multiple directories are given
+            string(STRIP "${_GSS_CFLAGS}" _GSS_CFLAGS)
+            string(REGEX REPLACE " +-I" ";" _GSS_CFLAGS "${_GSS_CFLAGS}")
+            string(REGEX REPLACE " +-([^I][^ \\t;]*)" ";-\\1"_GSS_CFLAGS "${_GSS_CFLAGS}")
+
+            foreach(_flag ${_GSS_CFLAGS})
+                if(_flag MATCHES "^-I.*")
+                    string(REGEX REPLACE "^-I" "" _val "${_flag}")
+                    list(APPEND _GSS_INCLUDE_DIR "${_val}")
+                else()
+                    list(APPEND _GSS_COMPILER_FLAGS "${_flag}")
+                endif()
+            endforeach()
+        endif()
+
+        execute_process(
+            COMMAND ${_GSS_CONFIGURE_SCRIPT} "--libs" "gssapi"
+            OUTPUT_VARIABLE _GSS_LIB_FLAGS
+            RESULT_VARIABLE _GSS_CONFIGURE_FAILED
+        )
+message(STATUS "LDFLAGS: ${_GSS_LIB_FLAGS}")
+        if(NOT _GSS_CONFIGURE_FAILED) # 0 means success
+            # this script gives us libraries and link directories. Blah. We have to deal with it.
+            string(STRIP "${_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 ${_GSS_LIB_FLAGS})
+                if(_flag MATCHES "^-l.*")
+                    string(REGEX REPLACE "^-l" "" _val "${_flag}")
+                    list(APPEND _GSS_LIBRARIES "${_val}")
+                elseif(_flag MATCHES "^-L.*")
+                    string(REGEX REPLACE "^-L" "" _val "${_flag}")
+                    list(APPEND _GSS_LINK_DIRECTORIES "${_val}")
+                else()
+                    list(APPEND _GSS_LINKER_FLAGS "${_flag}")
+                endif()
+            endforeach()
+        endif()
+
+
+        execute_process(
+            COMMAND ${_GSS_CONFIGURE_SCRIPT} "--version"
+            OUTPUT_VARIABLE _GSS_VERSION
+            RESULT_VARIABLE _GSS_CONFIGURE_FAILED
+        )
+
+        # older versions may not have the "--version" parameter. In this case we just don't care.
+        if(_GSS_CONFIGURE_FAILED)
+            set(_GSS_VERSION 0)
+        endif()
+
+
+        execute_process(
+            COMMAND ${_GSS_CONFIGURE_SCRIPT} "--vendor"
+            OUTPUT_VARIABLE _GSS_VENDOR
+            RESULT_VARIABLE _GSS_CONFIGURE_FAILED
+        )
+
+        # older versions may not have the "--vendor" parameter. In this case we just don't care.
+        if(_GSS_CONFIGURE_FAILED)
+            set(GSS_FLAVOUR "Heimdal") # most probably, shouldn't really matter
+        else()
+            if(_GSS_VENDOR MATCHES ".*H|heimdal.*")
+                set(GSS_FLAVOUR "Heimdal")
+            else()
+                set(GSS_FLAVOUR "MIT")
+            endif()
+        endif()
+
+    else() # either there is no config script or we are on platform that doesn't provide one (Windows?)
+
+        find_path(_GSS_INCLUDE_DIR
+            NAMES
+                "gssapi/gssapi.h"
+            HINTS
+                ${_GSS_ROOT_HINTS}
+            PATH_SUFFIXES
+                include
+                inc
+        )
+
+        if(_GSS_INCLUDE_DIR) #jay, we've found something
+            set(CMAKE_REQUIRED_INCLUDES "${_GSS_INCLUDE_DIR}")
+            check_include_files( "gssapi/gssapi_generic.h;gssapi/gssapi_krb5.h" _GSS_HAVE_MIT_HEADERS)
+
+            if(_GSS_HAVE_MIT_HEADERS)
+                set(GSS_FLAVOUR "MIT")
+            else()
+                # prevent compiling the header - just check if we can include it
+                set(CMAKE_REQUIRED_DEFINITIONS "-D__ROKEN_H__")
+                check_include_file( "roken.h" _GSS_HAVE_ROKEN_H)
+
+                check_include_file( "heimdal/roken.h" _GSS_HAVE_HEIMDAL_ROKEN_H)
+                if(_GSS_HAVE_ROKEN_H OR _GSS_HAVE_HEIMDAL_ROKEN_H)
+                    set(GSS_FLAVOUR "Heimdal")
+                endif()
+                set(CMAKE_REQUIRED_DEFINITIONS "")
+            endif()
+        else()
+            # I'm not convienced if this is the right way but this is what autotools do at the moment
+            find_path(_GSS_INCLUDE_DIR
+                NAMES
+                    "gssapi.h"
+                HINTS
+                    ${_GSS_ROOT_HINTS}
+                PATH_SUFFIXES
+                    include
+                    inc
+            )
+
+            if(_GSS_INCLUDE_DIR)
+                set(GSS_FLAVOUR "Heimdal")
+            endif()
+        endif()
+
+        # if we have headers, check if we can link libraries
+        if(GSS_FLAVOUR)
+            set(_GSS_LIBDIR_SUFFIXES "")
+            set(_GSS_LIBDIR_HINTS ${_GSS_ROOT_HINTS})
+            get_filename_component(_GSS_CALCULATED_POTENTIAL_ROOT "${_GSS_INCLUDE_DIR}" PATH)
+            list(APPEND _GSS_LIBDIR_HINTS ${_GSS_CALCULATED_POTENTIAL_ROOT})
+
+            if(WIN32)
+                if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+                    list(APPEND _GSS_LIBDIR_SUFFIXES "lib/AMD64")
+                    if(GSS_FLAVOUR STREQUAL "MIT")
+                        set(_GSS_LIBNAME "gssapi64")
+                    else()
+                        set(_GSS_LIBNAME "libgssapi")
+                    endif()
+                else()
+                    list(APPEND _GSS_LIBDIR_SUFFIXES "lib/i386")
+                    if(GSS_FLAVOUR STREQUAL "MIT")
+                        set(_GSS_LIBNAME "gssapi32")
+                    else()
+                        set(_GSS_LIBNAME "libgssapi")
+                    endif()
+                endif()
+            else()
+                list(APPEND _GSS_LIBDIR_SUFFIXES "lib;lib64") # those suffixes are not checked for HINTS
+                if(GSS_FLAVOUR STREQUAL "MIT")
+                    set(_GSS_LIBNAME "gssapi_krb5")
+                else()
+                    set(_GSS_LIBNAME "gssapi")
+                endif()
+            endif()
+
+            find_library(_GSS_LIBRARIES
+                NAMES
+                    ${_GSS_LIBNAME}
+                HINTS
+                    ${_GSS_LIBDIR_HINTS}
+                PATH_SUFFIXES
+                    ${_GSS_LIBDIR_SUFFIXES}
+            )
+
+        endif()
+
+    endif()
+else()
+    if(_GSS_PKG_${_MIT_MODNAME}_VERSION)
+        set(GSS_FLAVOUR "MIT")
+        set(_GSS_VERSION _GSS_PKG_${_MIT_MODNAME}_VERSION)
+    else()
+        set(GSS_FLAVOUR "Heimdal")
+        set(_GSS_VERSION _GSS_PKG_${_MIT_HEIMDAL}_VERSION)
+    endif()
+endif()
+
+set(GSS_INCLUDE_DIR ${_GSS_INCLUDE_DIR})
+set(GSS_LIBRARIES ${_GSS_LIBRARIES})
+set(GSS_LINK_DIRECTORIES ${_GSS_LINK_DIRECTORIES})
+set(GSS_LINKER_FLAGS ${_GSS_LINKER_FLAGS})
+set(GSS_COMPILER_FLAGS ${_GSS_COMPILER_FLAGS})
+set(GSS_VERSION ${_GSS_VERSION})
+
+if(GSS_FLAVOUR)
+
+    if(NOT GSS_VERSION AND GSS_FLAVOUR STREQUAL "Heimdal")
+        if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+            set(HEIMDAL_MANIFEST_FILE "Heimdal.Application.amd64.manifest")
+        else()
+            set(HEIMDAL_MANIFEST_FILE "Heimdal.Application.x86.manifest")
+        endif()
+
+        if(EXISTS "${GSS_INCLUDE_DIR}/${HEIMDAL_MANIFEST_FILE}")
+            file(STRINGS "${GSS_INCLUDE_DIR}/${HEIMDAL_MANIFEST_FILE}" heimdal_version_str
+                 REGEX "^.*version=\"[0-9]\\.[^\"]+\".*$")
+
+            string(REGEX MATCH "[0-9]\\.[^\"]+"
+                   GSS_VERSION "${heimdal_version_str}")
+        endif()
+
+        if(NOT GSS_VERSION)
+            set(GSS_VERSION "Heimdal Unknown")
+        endif()
+    elseif(NOT GSS_VERSION AND GSS_FLAVOUR STREQUAL "MIT")
+        get_filename_component(_MIT_VERSION "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MIT\\Kerberos\\SDK\\CurrentVersion;VersionString]" NAME CACHE)
+        if(WIN32 AND _MIT_VERSION)
+            set(GSS_VERSION "${_MIT_VERSION}")
+        else()
+            set(GSS_VERSION "MIT Unknown")
+        endif()
+    endif()
+endif()
+
+
+include(FindPackageHandleStandardArgs)
+
+set(_GSS_REQUIRED_VARS GSS_LIBRARIES GSS_FLAVOUR)
+
+find_package_handle_standard_args(GSS
+    REQUIRED_VARS
+        ${_GSS_REQUIRED_VARS}
+    VERSION_VAR
+        GSS_VERSION
+    FAIL_MESSAGE
+        "Could NOT find GSS, try to set the path to GSS root folder in the system variable GSS_ROOT_DIR"
+)
+
+mark_as_advanced(GSS_INCLUDE_DIR GSS_LIBRARIES)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c48fd011b..0f8e50331 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -416,8 +416,64 @@ if(CMAKE_USE_LIBSSH2)
   endif(LIBSSH2_FOUND)
 endif(CMAKE_USE_LIBSSH2)
 
-# For other tests to use the same libraries
-set(CMAKE_REQUIRED_LIBRARIES ${CURL_LIBS})
+option(CMAKE_USE_GSSAPI "Use GSSAPI implementation (right now only Heimdal is supported with CMake build)" OFF)
+mark_as_advanced(CMAKE_USE_GSSAPI)
+
+if(CMAKE_USE_GSSAPI)
+  find_package(GSS)
+
+  set(HAVE_GSS_API ${GSS_FOUND})
+  if(GSS_FOUND)
+
+    message(STATUS "Found ${GSS_FLAVOUR} GSSAPI version: \"${GSS_VERSION}\"")
+
+    set(CMAKE_REQUIRED_INCLUDES ${GSS_INCLUDE_DIR})
+    check_include_file_concat("gssapi/gssapi.h"  HAVE_GSSAPI_GSSAPI_H)
+    check_include_file_concat("gssapi/gssapi_generic.h" HAVE_GSSAPI_GSSAPI_GENERIC_H)
+    check_include_file_concat("gssapi/gssapi_krb5.h" HAVE_GSSAPI_GSSAPI_KRB5_H)
+
+    if(GSS_FLAVOUR STREQUAL "Heimdal")
+      set(HAVE_GSSHEIMDAL ON)
+    else() # MIT
+      set(HAVE_GSSMIT ON)
+      set(_INCLUDE_LIST "")
+      if(HAVE_GSSAPI_GSSAPI_H)
+        list(APPEND _INCLUDE_LIST "gssapi/gssapi.h")
+      endif()
+      if(HAVE_GSSAPI_GSSAPI_GENERIC_H)
+        list(APPEND _INCLUDE_LIST "gssapi/gssapi_generic.h")
+      endif()
+      if(HAVE_GSSAPI_GSSAPI_KRB5_H)
+        list(APPEND _INCLUDE_LIST "gssapi/gssapi_krb5.h")
+      endif()
+
+      string(REPLACE ";" " " _COMPILER_FLAGS_STR "${GSS_COMPILER_FLAGS}")
+      string(REPLACE ";" " " _LINKER_FLAGS_STR "${GSS_LINKER_FLAGS}")
+
+      foreach(_dir ${GSS_LINK_DIRECTORIES})
+        set(_LINKER_FLAGS_STR "${_LINKER_FLAGS_STR} -L\"${_dir}\"")
+      endforeach()
+
+      set(CMAKE_REQUIRED_FLAGS "${_COMPILER_FLAGS_STR} ${_LINKER_FLAGS_STR}")
+      set(CMAKE_REQUIRED_LIBRARIES ${GSS_LIBRARIES})
+      check_symbol_exists("GSS_C_NT_HOSTBASED_SERVICE" ${_INCLUDE_LIST} HAVE_GSS_C_NT_HOSTBASED_SERVICE)
+      if(NOT HAVE_GSS_C_NT_HOSTBASED_SERVICE)
+        set(HAVE_OLD_GSSMIT ON)
+      endif()
+
+    endif()
+
+    include_directories(${GSS_INCLUDE_DIR})
+    link_directories(${GSS_LINK_DIRECTORIES})
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GSS_COMPILER_FLAGS}")
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${GSS_LINKER_FLAGS}")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${GSS_LINKER_FLAGS}")
+    list(APPEND CURL_LIBS ${GSS_LIBRARIES})
+
+  else()
+    message(WARNING "GSSAPI support has been requested but no supporting libraries found. Skipping.")
+  endif()
+endif()
 
 # If we have features.h, then do the _BSD_SOURCE magic
 check_include_file("features.h"       HAVE_FEATURES_H)
@@ -457,9 +513,6 @@ check_include_file_concat("des.h"            HAVE_DES_H)
 check_include_file_concat("err.h"            HAVE_ERR_H)
 check_include_file_concat("errno.h"          HAVE_ERRNO_H)
 check_include_file_concat("fcntl.h"          HAVE_FCNTL_H)
-check_include_file_concat("gssapi/gssapi.h"  HAVE_GSSAPI_GSSAPI_H)
-check_include_file_concat("gssapi/gssapi_generic.h" HAVE_GSSAPI_GSSAPI_GENERIC_H)
-check_include_file_concat("gssapi/gssapi_krb5.h" HAVE_GSSAPI_GSSAPI_KRB5_H)
 check_include_file_concat("idn-free.h"       HAVE_IDN_FREE_H)
 check_include_file_concat("ifaddrs.h"        HAVE_IFADDRS_H)
 check_include_file_concat("io.h"             HAVE_IO_H)
@@ -579,6 +632,12 @@ find_file(RANDOM_FILE urandom /dev)
 mark_as_advanced(RANDOM_FILE)
 
 # Check for some functions that are used
+if(HAVE_LIBWS2_32)
+  set(CMAKE_REQUIRED_LIBRARIES ws2_32)
+elseif(HAVE_LIBSOCKET)
+  set(CMAKE_REQUIRED_LIBRARIES socket)
+endif()
+
 check_symbol_exists(basename      "${CURL_INCLUDES}" HAVE_BASENAME)
 check_symbol_exists(socket        "${CURL_INCLUDES}" HAVE_SOCKET)
 check_symbol_exists(poll          "${CURL_INCLUDES}" HAVE_POLL)
@@ -680,12 +739,7 @@ if(NOT HAVE_STRICMP)
   set(HAVE_LDAP_URL_PARSE 1)
 endif(NOT HAVE_STRICMP)
 
-
-
 # Do curl specific tests
-if(HAVE_LIBWS2_32)
-  set(CMAKE_REQUIRED_LIBRARIES ws2_32)
-endif()
 foreach(CURL_TEST
     HAVE_FCNTL_O_NONBLOCK
     HAVE_IOCTLSOCKET
diff --git a/Makefile.am b/Makefile.am
index e66b2361d..e9b0b9072 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,8 +26,9 @@ ACLOCAL_AMFLAGS = -I m4
 
 CMAKE_DIST = CMakeLists.txt CMake/CMakeConfigurableFile.in		    \
 CMake/CurlCheckCSourceCompiles.cmake CMake/CurlCheckCSourceRuns.cmake	    \
-CMake/CurlTests.c CMake/OtherTests.cmake CMake/Platforms/WindowsCache.cmake \
-CMake/Utilities.cmake include/curl/curlbuild.h.cmake
+CMake/CurlTests.c CMake/FindGSS.cmake CMake/OtherTests.cmake                \
+CMake/Platforms/WindowsCache.cmake CMake/Utilities.cmake                    \
+include/curl/curlbuild.h.cmake
 
 VC6_LIBTMPL = projects/Windows/VC6/lib/libcurl.tmpl
 VC6_LIBDSP = projects/Windows/VC6/lib/libcurl.dsp