LogicalFile: add selinux contexts support

Add support for displaying the current and the expected selinux
context on a file.

3 files changed, 76 insertions, 1 deletions

diff --git a/mof/60_LMI_LogicalFile.mof b/mof/60_LMI_LogicalFile.mof
index 7ae2e82..5364598 100644
--- a/mof/60_LMI_LogicalFile.mof
+++ b/mof/60_LMI_LogicalFile.mof
@@ -21,6 +21,13 @@
 
 class LMI_UnixFile : CIM_UnixFile
 {
+  [ Description (
+    "Current SELinux context." ) ]
+    string SELinuxCurrentContext;
+
+  [ Description (
+    "Expected SELinux context." ) ]
+    string SELinuxExpectedContext;
 };
 
 class LMI_DataFile : CIM_DataFile
diff --git a/src/logicalfile/CMakeLists.txt b/src/logicalfile/CMakeLists.txt
index c0d6b25..d8c6532 100644
--- a/src/logicalfile/CMakeLists.txt
+++ b/src/logicalfile/CMakeLists.txt
@@ -20,9 +20,16 @@ add_library(${LIBRARY_NAME} SHARED
 )
 
 pkg_check_modules(LIBUDEV REQUIRED libudev)
+pkg_check_modules(LIBSELINUX libselinux)
+if(LIBSELINUX_FOUND EQUAL 1)
+    add_definitions(-DLOGICALFILE_SELINUX)
+endif(LIBSELINUX_FOUND EQUAL 1)
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMPI_INCLUDE_DIR})
-target_link_libraries(${LIBRARY_NAME} openlmicommon ${KONKRETCMPI_LIBRARIES} ${LIBUDEV_LIBRARIES})
+target_link_libraries(${LIBRARY_NAME} openlmicommon
+                      ${KONKRETCMPI_LIBRARIES}
+                      ${LIBUDEV_LIBRARIES}
+                      ${LIBSELINUX_LIBRARIES})
 
 # Create registration file
 cim_registration(${PROVIDER_NAME} ${LIBRARY_NAME} ${MOF} share/openlmi-providers)
diff --git a/src/logicalfile/LMI_UnixFileProvider.c b/src/logicalfile/LMI_UnixFileProvider.c
index 937fa04..d822565 100644
--- a/src/logicalfile/LMI_UnixFileProvider.c
+++ b/src/logicalfile/LMI_UnixFileProvider.c
@@ -18,13 +18,50 @@
  * Authors: Jan Synacek <jsynacek@redhat.com>
  */
 #include <konkret/konkret.h>
+#include <sys/time.h>
 #include "LMI_UnixFile.h"
 #include "file.h"
 
 static const CMPIBroker* _cb = NULL;
 
+#ifdef LOGICALFILE_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+
+static struct selabel_handle *_selabel_hnd = NULL;
+static struct selabel_handle *get_selabel_handle()
+{
+    static struct timeval timestamp = {.tv_sec = 0, .tv_usec = 0};
+    const unsigned int CHECK_PERIOD = 20; /* seconds */
+    const char *err = "gettimeofday() failed, selinux handle might not get re-initialized";
+
+    if (_selabel_hnd == NULL) {
+        _selabel_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+        if (gettimeofday(&timestamp, NULL) < 0) {
+            lmi_warn(err);
+        }
+    } else {
+        struct timeval now;
+        if (gettimeofday(&now, NULL) < 0) {
+            lmi_warn(err);
+        }
+        /* reinit handle if it's too old */
+        if (now.tv_sec - timestamp.tv_sec >= CHECK_PERIOD) {
+            selabel_close(_selabel_hnd);
+            _selabel_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+            if (gettimeofday(&timestamp, NULL) < 0) {
+                lmi_warn(err);
+            }
+        }
+    }
+
+    return _selabel_hnd;
+}
+#endif
+
 static void LMI_UnixFileInitialize()
 {
+    lmi_init_logging(LMI_UnixFile_ClassName, _cb);
 }
 
 static CMPIStatus LMI_UnixFileCleanup(
@@ -32,6 +69,11 @@ static CMPIStatus LMI_UnixFileCleanup(
     const CMPIContext* cc,
     CMPIBoolean term)
 {
+#ifdef LOGICALFILE_SELINUX
+    if (_selabel_hnd != NULL) {
+        selabel_close(_selabel_hnd);
+    }
+#endif
     CMReturn(CMPI_RC_OK);
 }
 
@@ -90,6 +132,25 @@ static CMPIStatus LMI_UnixFileGetInstance(
     LMI_UnixFile_Set_LinkCount(&lmi_file, sb.st_nlink);
     /* sticky bit */
     LMI_UnixFile_Set_SaveText(&lmi_file, sb.st_mode & S_IFMT & S_ISVTX);
+#ifdef LOGICALFILE_SELINUX
+    /* selinux */
+    security_context_t context;
+    struct selabel_handle *hnd;
+    if (lgetfilecon(path, &context) < 0) {
+        CMReturnWithChars(_cb, CMPI_RC_ERR_NOT_FOUND, "Can't get selinux file context");
+    }
+    LMI_UnixFile_Set_SELinuxCurrentContext(&lmi_file, context);
+    freecon(context);
+    hnd = get_selabel_handle();
+    if (hnd == NULL) {
+        CMReturnWithChars(_cb, CMPI_RC_ERR_NOT_FOUND, "Can't get selabel handle");
+    }
+    if (selabel_lookup(hnd, &context, path, 0) < 0) {
+        CMReturnWithChars(_cb, CMPI_RC_ERR_NOT_FOUND, "Can't look up selinux file context");
+    }
+    LMI_UnixFile_Set_SELinuxExpectedContext(&lmi_file, context);
+    freecon(context);
+#endif
 
     KReturnInstance(cr, lmi_file);
     CMReturn(CMPI_RC_OK);