Add GSSAPI support for SPNEGO/Kerberos auth over HTTP

CMakeLists.txt

@@ -36,6 +36,7 @@ OPTION( ANDROID				"Build for android NDK"	 				OFF )
 
 OPTION( USE_ICONV			"Link with and use iconv library" 		OFF )
 OPTION( USE_SSH				"Link with libssh to enable SSH support" ON )
+OPTION( USE_GSSAPI			"Link with libgssapi for SPNEGO auth"    ON )
 OPTION( VALGRIND			"Configure build for valgrind"			OFF )
 
 IF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
@@ -208,6 +209,14 @@ IF (LIBSSH2_FOUND)
 	SET(SSH_LIBRARIES ${LIBSSH2_LIBRARIES})
 ENDIF()
 
+# Optional external dependency: libgssapi
+IF (USE_GSSAPI)
+	FIND_PACKAGE(GSSAPI)
+ENDIF()
+IF (GSSAPI_FOUND)
+	ADD_DEFINITIONS(-DGIT_GSSAPI)
+ENDIF()
+
 # Optional external dependency: iconv
 IF (USE_ICONV)
 	FIND_PACKAGE(Iconv)
@@ -387,6 +396,7 @@ ENDIF()
 ADD_LIBRARY(git2 ${SRC_H} ${SRC_GIT2} ${SRC_OS} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1} ${WIN_RC})
 TARGET_LINK_LIBRARIES(git2 ${SSL_LIBRARIES})
 TARGET_LINK_LIBRARIES(git2 ${SSH_LIBRARIES})
+TARGET_LINK_LIBRARIES(git2 ${GSSAPI_LIBRARIES})
 TARGET_LINK_LIBRARIES(git2 ${ICONV_LIBRARIES})
 TARGET_OS_LIBRARIES(git2)
 
@@ -453,6 +463,7 @@ IF (BUILD_CLAR)
 
 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSL_LIBRARIES})
 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSH_LIBRARIES})
+	TARGET_LINK_LIBRARIES(libgit2_clar ${GSSAPI_LIBRARIES})
 	TARGET_LINK_LIBRARIES(libgit2_clar ${ICONV_LIBRARIES})
 	TARGET_OS_LIBRARIES(libgit2_clar)
 	MSVC_SPLIT_SOURCES(libgit2_clar)

cmake/Modules/FindGSSAPI.cmake

+# - Try to find GSSAPI
+# Once done this will define
+#
+#  KRB5_CONFIG - Path to krb5-config
+#  GSSAPI_ROOT_DIR - Set this variable to the root installation of GSSAPI
+#
+# Read-Only variables:
+#  GSSAPI_FLAVOR_MIT - set to TURE if MIT Kerberos has been found
+#  GSSAPI_FLAVOR_HEIMDAL - set to TRUE if Heimdal Keberos has been found
+#  GSSAPI_FOUND - system has GSSAPI
+#  GSSAPI_INCLUDE_DIR - the GSSAPI include directory
+#  GSSAPI_LIBRARIES - Link these to use GSSAPI
+#  GSSAPI_DEFINITIONS - Compiler switches required for using GSSAPI
+#
+#=============================================================================
+#  Copyright (c) 2013 Andreas Schneider <asn@cryptomilk.org>
+#
+#  Distributed under the OSI-approved BSD License (the "License");
+#  see accompanying file Copyright.txt for details.
+#
+#  This software is distributed WITHOUT ANY WARRANTY; without even the
+#  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#  See the License for more information.
+#=============================================================================
+#
+
+find_path(GSSAPI_ROOT_DIR
+    NAMES
+        include/gssapi.h
+        include/gssapi/gssapi.h
+    HINTS
+        ${_GSSAPI_ROOT_HINTS}
+    PATHS
+        ${_GSSAPI_ROOT_PATHS}
+)
+mark_as_advanced(GSSAPI_ROOT_DIR)
+
+if (UNIX)
+    find_program(KRB5_CONFIG
+        NAMES
+            krb5-config
+        PATHS
+            ${GSSAPI_ROOT_DIR}/bin
+            /opt/local/bin)
+    mark_as_advanced(KRB5_CONFIG)
+
+    if (KRB5_CONFIG)
+        # Check if we have MIT KRB5
+        execute_process(
+            COMMAND
+                ${KRB5_CONFIG} --vendor
+            RESULT_VARIABLE
+                _GSSAPI_VENDOR_RESULT
+            OUTPUT_VARIABLE
+                _GSSAPI_VENDOR_STRING)
+
+        if (_GSSAPI_VENDOR_STRING MATCHES ".*Massachusetts.*")
+            set(GSSAPI_FLAVOR_MIT TRUE)
+        else()
+            execute_process(
+                COMMAND
+                    ${KRB5_CONFIG} --libs gssapi
+                RESULT_VARIABLE
+                    _GSSAPI_LIBS_RESULT
+                OUTPUT_VARIABLE
+                    _GSSAPI_LIBS_STRING)
+
+            if (_GSSAPI_LIBS_STRING MATCHES ".*roken.*")
+                set(GSSAPI_FLAVOR_HEIMDAL TRUE)
+            endif()
+        endif()
+
+        # Get the include dir
+        execute_process(
+            COMMAND
+                ${KRB5_CONFIG} --cflags gssapi
+            RESULT_VARIABLE
+                _GSSAPI_INCLUDE_RESULT
+            OUTPUT_VARIABLE
+                _GSSAPI_INCLUDE_STRING)
+        string(REGEX REPLACE "(\r?\n)+$" "" _GSSAPI_INCLUDE_STRING "${_GSSAPI_INCLUDE_STRING}")
+        string(REGEX REPLACE " *-I" "" _GSSAPI_INCLUDEDIR "${_GSSAPI_INCLUDE_STRING}")
+    endif()
+
+    if (NOT GSSAPI_FLAVOR_MIT AND NOT GSSAPI_FLAVOR_HEIMDAL)
+        # Check for HEIMDAL
+        find_package(PkgConfig)
+        if (PKG_CONFIG_FOUND)
+            pkg_check_modules(_GSSAPI heimdal-gssapi)
+        endif (PKG_CONFIG_FOUND)
+
+        if (_GSSAPI_FOUND)
+            set(GSSAPI_FLAVOR_HEIMDAL TRUE)
+        else()
+            find_path(_GSSAPI_ROKEN
+                NAMES
+                    roken.h
+                PATHS
+                    ${GSSAPI_ROOT_DIR}/include
+                    ${_GSSAPI_INCLUDEDIR})
+            if (_GSSAPI_ROKEN)
+                set(GSSAPI_FLAVOR_HEIMDAL TRUE)
+            endif()
+        endif ()
+    endif()
+endif (UNIX)
+
+find_path(GSSAPI_INCLUDE_DIR
+    NAMES
+        gssapi.h
+        gssapi/gssapi.h
+    PATHS
+        ${GSSAPI_ROOT_DIR}/include
+        ${_GSSAPI_INCLUDEDIR}
+)
+
+if (GSSAPI_FLAVOR_MIT)
+    find_library(GSSAPI_LIBRARY
+        NAMES
+            gssapi_krb5
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(KRB5_LIBRARY
+        NAMES
+            krb5
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(K5CRYPTO_LIBRARY
+        NAMES
+            k5crypto
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(COM_ERR_LIBRARY
+        NAMES
+            com_err
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    if (GSSAPI_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${GSSAPI_LIBRARY}
+        )
+    endif (GSSAPI_LIBRARY)
+
+    if (KRB5_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${KRB5_LIBRARY}
+        )
+    endif (KRB5_LIBRARY)
+
+    if (K5CRYPTO_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${K5CRYPTO_LIBRARY}
+        )
+    endif (K5CRYPTO_LIBRARY)
+
+    if (COM_ERR_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${COM_ERR_LIBRARY}
+        )
+    endif (COM_ERR_LIBRARY)
+endif (GSSAPI_FLAVOR_MIT)
+
+if (GSSAPI_FLAVOR_HEIMDAL)
+    find_library(GSSAPI_LIBRARY
+        NAMES
+            gssapi
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(KRB5_LIBRARY
+        NAMES
+            krb5
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(HCRYPTO_LIBRARY
+        NAMES
+            hcrypto
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(COM_ERR_LIBRARY
+        NAMES
+            com_err
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(HEIMNTLM_LIBRARY
+        NAMES
+            heimntlm
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(HX509_LIBRARY
+        NAMES
+            hx509
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(ASN1_LIBRARY
+        NAMES
+            asn1
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(WIND_LIBRARY
+        NAMES
+            wind
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    find_library(ROKEN_LIBRARY
+        NAMES
+            roken
+        PATHS
+            ${GSSAPI_ROOT_DIR}/lib
+            ${_GSSAPI_LIBDIR}
+    )
+
+    if (GSSAPI_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${GSSAPI_LIBRARY}
+        )
+    endif (GSSAPI_LIBRARY)
+
+    if (KRB5_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${KRB5_LIBRARY}
+        )
+    endif (KRB5_LIBRARY)
+
+    if (HCRYPTO_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${HCRYPTO_LIBRARY}
+        )
+    endif (HCRYPTO_LIBRARY)
+
+    if (COM_ERR_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${COM_ERR_LIBRARY}
+        )
+    endif (COM_ERR_LIBRARY)
+
+    if (HEIMNTLM_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${HEIMNTLM_LIBRARY}
+        )
+    endif (HEIMNTLM_LIBRARY)
+
+    if (HX509_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${HX509_LIBRARY}
+        )
+    endif (HX509_LIBRARY)
+
+    if (ASN1_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${ASN1_LIBRARY}
+        )
+    endif (ASN1_LIBRARY)
+
+    if (WIND_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${WIND_LIBRARY}
+        )
+    endif (WIND_LIBRARY)
+
+    if (ROKEN_LIBRARY)
+        set(GSSAPI_LIBRARIES
+            ${GSSAPI_LIBRARIES}
+            ${WIND_LIBRARY}
+        )
+    endif (ROKEN_LIBRARY)
+endif (GSSAPI_FLAVOR_HEIMDAL)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GSSAPI DEFAULT_MSG GSSAPI_LIBRARIES GSSAPI_INCLUDE_DIR)
+
+if (GSSAPI_INCLUDE_DIRS AND GSSAPI_LIBRARIES)
+    set(GSSAPI_FOUND TRUE)
+endif (GSSAPI_INCLUDE_DIRS AND GSSAPI_LIBRARIES)
+
+# show the GSSAPI_INCLUDE_DIRS and GSSAPI_LIBRARIES variables only in the advanced view
+mark_as_advanced(GSSAPI_INCLUDE_DIRS GSSAPI_LIBRARIES)