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Detect FIPS using SECMOD_GetSystemFIPSEnabled in the new libsystemconf JDK library.

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Minor code cleanups on FIPS detection patch and check for SECMOD_GetSystemFIPSEnabled in configure.
Remove unneeded Requires on NSS as it will now be dynamically linked and detected by RPM.
This commit is contained in:
Andrew Hughes 2021-06-08 18:31:34 +01:00
parent c96e1e74e2
commit bd1d801cc3
2 changed files with 446 additions and 6 deletions
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22
java-11-openjdk.spec
View File

@ -345,7 +345,7 @@
%global top_level_dir_name %{origin}
%global top_level_dir_name_backup %{top_level_dir_name}-backup
%global buildver 9
%global rpmrelease 4
%global rpmrelease 5
#%%global tagsuffix ""
# Priority must be 8 digits in total; up to openjdk 1.8, we were using 18..... so when we moved to 11, we had to add another digit
%if %is_system_jdk
@ -404,7 +404,7 @@
# fix for https://bugzilla.redhat.com/show_bug.cgi?id=1111349
# https://bugzilla.redhat.com/show_bug.cgi?id=1590796#c14
# https://bugzilla.redhat.com/show_bug.cgi?id=1655938
%global _privatelibs libsplashscreen[.]so.*|libawt_xawt[.]so.*|libjli[.]so.*|libattach[.]so.*|libawt[.]so.*|libextnet[.]so.*|libawt_headless[.]so.*|libdt_socket[.]so.*|libfontmanager[.]so.*|libinstrument[.]so.*|libj2gss[.]so.*|libj2pcsc[.]so.*|libj2pkcs11[.]so.*|libjaas[.]so.*|libjavajpeg[.]so.*|libjdwp[.]so.*|libjimage[.]so.*|libjsound[.]so.*|liblcms[.]so.*|libmanagement[.]so.*|libmanagement_agent[.]so.*|libmanagement_ext[.]so.*|libmlib_image[.]so.*|libnet[.]so.*|libnio[.]so.*|libprefs[.]so.*|librmi[.]so.*|libsaproc[.]so.*|libsctp[.]so.*|libsunec[.]so.*|libunpack[.]so.*|libzip[.]so.*
%global _privatelibs libsplashscreen[.]so.*|libawt_xawt[.]so.*|libjli[.]so.*|libattach[.]so.*|libawt[.]so.*|libextnet[.]so.*|libawt_headless[.]so.*|libdt_socket[.]so.*|libfontmanager[.]so.*|libinstrument[.]so.*|libj2gss[.]so.*|libj2pcsc[.]so.*|libj2pkcs11[.]so.*|libjaas[.]so.*|libjavajpeg[.]so.*|libjdwp[.]so.*|libjimage[.]so.*|libjsound[.]so.*|liblcms[.]so.*|libmanagement[.]so.*|libmanagement_agent[.]so.*|libmanagement_ext[.]so.*|libmlib_image[.]so.*|libnet[.]so.*|libnio[.]so.*|libprefs[.]so.*|librmi[.]so.*|libsaproc[.]so.*|libsctp[.]so.*|libsunec[.]so.*|libsystemconf[.]so.*|libunpack[.]so.*|libzip[.]so.*
%global _publiclibs libjawt[.]so.*|libjava[.]so.*|libjvm[.]so.*|libverify[.]so.*|libjsig[.]so.*
%if %is_system_jdk
%global __provides_exclude ^(%{_privatelibs})$
@ -763,6 +763,7 @@ exit 0
%endif
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libsctp.so
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libsunec.so
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libsystemconf.so
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libunpack.so
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libverify.so
%{_jvmdir}/%{sdkdir -- %{?1}}/lib/libzip.so
@ -1021,8 +1022,6 @@ OrderWithRequires: copy-jdk-configs
%endif
# for printing support
Requires: cups-libs
# for FIPS PKCS11 provider
Requires: nss
# Post requires alternatives to install tool alternatives
Requires(post): %{alternatives_requires}
# Postun requires alternatives to uninstall tool alternatives
@ -1221,6 +1220,8 @@ Patch1002: rh1818909-fips_default_keystore_type.patch
Patch1004: rh1860986-disable_tlsv1.3_in_fips_mode.patch
# RH1915071: Always initialise JavaSecuritySystemConfiguratorAccess
Patch1007: rh1915071-always_initialise_configurator_access.patch
# RH1929465: Improve system FIPS detection
Patch1008: rh1929465-improve_system_FIPS_detection.patch
#############################################
#
@ -1280,8 +1281,8 @@ BuildRequires: libXrandr-devel
BuildRequires: libXrender-devel
BuildRequires: libXt-devel
BuildRequires: libXtst-devel
# Requirements for setting up the nss.cfg
BuildRequires: nss-devel
# Requirements for setting up the nss.cfg and FIPS support
BuildRequires: nss-devel >= 3.53
BuildRequires: pkgconfig
BuildRequires: xorg-x11-proto-devel
BuildRequires: zip
@ -1620,6 +1621,7 @@ popd # openjdk
%patch1003
%patch1004
%patch1007
%patch1008
# Extract systemtap tapsets
%if %{with_systemtap}
@ -1757,6 +1759,7 @@ bash ${top_dir_abs_src_path}/configure \
--with-boot-jdk=/usr/lib/jvm/java-%{buildjdkver}-openjdk \
--with-debug-level=$debugbuild \
--with-native-debug-symbols=internal \
--enable-sysconf-nss \
--enable-unlimited-crypto \
--with-zlib=system \
--with-libjpeg=${link_opt} \
@ -2317,6 +2320,13 @@ cjc.mainProgram(args)
%endif
%changelog
* Tue Jun 08 2021 Andrew Hughes <gnu.andrew@redhat.com> - 1:11.0.11.0.9-5
- Minor code cleanups on FIPS detection patch and check for SECMOD_GetSystemFIPSEnabled in configure.
- Remove unneeded Requires on NSS as it will now be dynamically linked and detected by RPM.
* Tue Jun 08 2021 Martin Balao <mbalao@redhat.com> - 1:11.0.11.0.9-5
- Detect FIPS using SECMOD_GetSystemFIPSEnabled in the new libsystemconf JDK library.
* Wed Jun 02 2021 Andrew John Hughes <gnu.andrew@redhat.com> - 1:11.0.11.0.9-4
- Update RH1655466 FIPS patch with changes in OpenJDK 8 version.
- SunPKCS11 runtime provider name is a concatenation of "SunPKCS11-" and the name in the config file.

430
rh1929465-improve_system_FIPS_detection.patch Normal file
View File

@ -0,0 +1,430 @@
diff --git openjdk.orig/make/autoconf/libraries.m4 openjdk/make/autoconf/libraries.m4
--- openjdk.orig/make/autoconf/libraries.m4
+++ openjdk/make/autoconf/libraries.m4
@@ -101,6 +101,7 @@
LIB_SETUP_LIBFFI
LIB_SETUP_BUNDLED_LIBS
LIB_SETUP_MISC_LIBS
+ LIB_SETUP_SYSCONF_LIBS
LIB_SETUP_SOLARIS_STLPORT
LIB_TESTS_SETUP_GRAALUNIT
@@ -223,3 +224,62 @@
fi
])
+################################################################################
+# Setup system configuration libraries
+################################################################################
+AC_DEFUN_ONCE([LIB_SETUP_SYSCONF_LIBS],
+[
+ ###############################################################################
+ #
+ # Check for the NSS library
+ #
+
+ AC_MSG_CHECKING([whether to use the system NSS library with the System Configurator (libsysconf)])
+
+ # default is not available
+ DEFAULT_SYSCONF_NSS=no
+
+ AC_ARG_ENABLE([sysconf-nss], [AS_HELP_STRING([--enable-sysconf-nss],
+ [build the System Configurator (libsysconf) using the system NSS library if available @<:@disabled@:>@])],
+ [
+ case "${enableval}" in
+ yes)
+ sysconf_nss=yes
+ ;;
+ *)
+ sysconf_nss=no
+ ;;
+ esac
+ ],
+ [
+ sysconf_nss=${DEFAULT_SYSCONF_NSS}
+ ])
+ AC_MSG_RESULT([$sysconf_nss])
+
+ USE_SYSCONF_NSS=false
+ if test "x${sysconf_nss}" = "xyes"; then
+ PKG_CHECK_MODULES(NSS, nss >= 3.53, [NSS_FOUND=yes], [NSS_FOUND=no])
+ if test "x${NSS_FOUND}" = "xyes"; then
+ AC_MSG_CHECKING([for system FIPS support in NSS])
+ saved_libs="${LIBS}"
+ saved_cflags="${CFLAGS}"
+ CFLAGS="${CFLAGS} ${NSS_CFLAGS}"
+ LIBS="${LIBS} ${NSS_LIBS}"
+ AC_LANG_PUSH([C])
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <nss3/pk11pub.h>]],
+ [[SECMOD_GetSystemFIPSEnabled()]])],
+ [AC_MSG_RESULT([yes])],
+ [AC_MSG_RESULT([no])
+ AC_MSG_ERROR([System NSS FIPS detection unavailable])])
+ AC_LANG_POP([C])
+ CFLAGS="${saved_cflags}"
+ LIBS="${saved_libs}"
+ USE_SYSCONF_NSS=true
+ else
+ dnl NSS 3.53 is the one that introduces the SECMOD_GetSystemFIPSEnabled API
+ dnl in nss3/pk11pub.h.
+ AC_MSG_ERROR([--enable-sysconf-nss specified, but NSS 3.53 or above not found.])
+ fi
+ fi
+ AC_SUBST(USE_SYSCONF_NSS)
+])
diff --git openjdk.orig/make/autoconf/spec.gmk.in openjdk/make/autoconf/spec.gmk.in
--- openjdk.orig/make/autoconf/spec.gmk.in
+++ openjdk/make/autoconf/spec.gmk.in
@@ -828,6 +828,10 @@
# Libraries
#
+USE_SYSCONF_NSS:=@USE_SYSCONF_NSS@
+NSS_LIBS:=@NSS_LIBS@
+NSS_CFLAGS:=@NSS_CFLAGS@
+
USE_EXTERNAL_LCMS:=@USE_EXTERNAL_LCMS@
LCMS_CFLAGS:=@LCMS_CFLAGS@
LCMS_LIBS:=@LCMS_LIBS@
diff --git openjdk.orig/make/lib/Lib-java.base.gmk openjdk/make/lib/Lib-java.base.gmk
--- openjdk.orig/make/lib/Lib-java.base.gmk
+++ openjdk/make/lib/Lib-java.base.gmk
@@ -179,6 +179,31 @@
endif
################################################################################
+# Create the systemconf library
+
+LIBSYSTEMCONF_CFLAGS :=
+LIBSYSTEMCONF_CXXFLAGS :=
+
+ifeq ($(USE_SYSCONF_NSS), true)
+ LIBSYSTEMCONF_CFLAGS += $(NSS_CFLAGS) -DSYSCONF_NSS
+ LIBSYSTEMCONF_CXXFLAGS += $(NSS_CFLAGS) -DSYSCONF_NSS
+endif
+
+ifeq ($(OPENJDK_BUILD_OS), linux)
+ $(eval $(call SetupJdkLibrary, BUILD_LIBSYSTEMCONF, \
+ NAME := systemconf, \
+ OPTIMIZATION := LOW, \
+ CFLAGS := $(CFLAGS_JDKLIB) $(LIBSYSTEMCONF_CFLAGS), \
+ CXXFLAGS := $(CXXFLAGS_JDKLIB) $(LIBSYSTEMCONF_CXXFLAGS), \
+ LDFLAGS := $(LDFLAGS_JDKLIB) \
+ $(call SET_SHARED_LIBRARY_ORIGIN), \
+ LIBS_unix := $(LIBDL) $(NSS_LIBS), \
+ ))
+
+ TARGETS += $(BUILD_LIBSYSTEMCONF)
+endif
+
+################################################################################
# Create the symbols file for static builds.
ifeq ($(STATIC_BUILD), true)
diff --git openjdk.orig/make/nb_native/nbproject/configurations.xml openjdk/make/nb_native/nbproject/configurations.xml
--- openjdk.orig/make/nb_native/nbproject/configurations.xml
+++ openjdk/make/nb_native/nbproject/configurations.xml
@@ -2950,6 +2950,9 @@
<in>LinuxWatchService.c</in>
</df>
</df>
+ <df name="libsystemconf">
+ <in>systemconf.c</in>
+ </df>
</df>
</df>
<df name="macosx">
@@ -29301,6 +29304,11 @@
tool="0"
flavor2="0">
</item>
+ <item path="../../src/java.base/linux/native/libsystemconf/systemconf.c"
+ ex="false"
+ tool="0"
+ flavor2="0">
+ </item>
<item path="../../src/java.base/macosx/native/include/jni_md.h"
ex="false"
tool="3"
diff --git openjdk.orig/make/scripts/compare_exceptions.sh.incl openjdk/make/scripts/compare_exceptions.sh.incl
--- openjdk.orig/make/scripts/compare_exceptions.sh.incl
+++ openjdk/make/scripts/compare_exceptions.sh.incl
@@ -179,6 +179,7 @@
./lib/libsplashscreen.so
./lib/libsunec.so
./lib/libsunwjdga.so
+ ./lib/libsystemconf.so
./lib/libunpack.so
./lib/libverify.so
./lib/libzip.so
@@ -289,6 +290,7 @@
./lib/libsplashscreen.so
./lib/libsunec.so
./lib/libsunwjdga.so
+ ./lib/libsystemconf.so
./lib/libunpack.so
./lib/libverify.so
./lib/libzip.so
diff --git openjdk.orig/src/java.base/linux/native/libsystemconf/systemconf.c openjdk/src/java.base/linux/native/libsystemconf/systemconf.c
new file mode 100644
--- /dev/null
+++ openjdk/src/java.base/linux/native/libsystemconf/systemconf.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2021, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include <dlfcn.h>
+#include <jni.h>
+#include <jni_util.h>
+#include <stdio.h>
+
+#ifdef SYSCONF_NSS
+#include <nss3/pk11pub.h>
+#endif //SYSCONF_NSS
+
+#include "java_security_SystemConfigurator.h"
+
+#define FIPS_ENABLED_PATH "/proc/sys/crypto/fips_enabled"
+#define MSG_MAX_SIZE 96
+
+static jmethodID debugPrintlnMethodID = NULL;
+static jobject debugObj = NULL;
+
+static void throwIOException(JNIEnv *env, const char *msg);
+static void dbgPrint(JNIEnv *env, const char* msg);
+
+/*
+ * Class: java_security_SystemConfigurator
+ * Method: JNI_OnLoad
+ */
+JNIEXPORT jint JNICALL DEF_JNI_OnLoad(JavaVM *vm, void *reserved)
+{
+ JNIEnv *env;
+ jclass sysConfCls, debugCls;
+ jfieldID sdebugFld;
+
+ if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
+ return JNI_EVERSION; /* JNI version not supported */
+ }
+
+ sysConfCls = (*env)->FindClass(env,"java/security/SystemConfigurator");
+ if (sysConfCls == NULL) {
+ printf("libsystemconf: SystemConfigurator class not found\n");
+ return JNI_ERR;
+ }
+ sdebugFld = (*env)->GetStaticFieldID(env, sysConfCls,
+ "sdebug", "Lsun/security/util/Debug;");
+ if (sdebugFld == NULL) {
+ printf("libsystemconf: SystemConfigurator::sdebug field not found\n");
+ return JNI_ERR;
+ }
+ debugObj = (*env)->GetStaticObjectField(env, sysConfCls, sdebugFld);
+ if (debugObj != NULL) {
+ debugCls = (*env)->FindClass(env,"sun/security/util/Debug");
+ if (debugCls == NULL) {
+ printf("libsystemconf: Debug class not found\n");
+ return JNI_ERR;
+ }
+ debugPrintlnMethodID = (*env)->GetMethodID(env, debugCls,
+ "println", "(Ljava/lang/String;)V");
+ if (debugPrintlnMethodID == NULL) {
+ printf("libsystemconf: Debug::println(String) method not found\n");
+ return JNI_ERR;
+ }
+ debugObj = (*env)->NewGlobalRef(env, debugObj);
+ }
+
+ return (*env)->GetVersion(env);
+}
+
+/*
+ * Class: java_security_SystemConfigurator
+ * Method: JNI_OnUnload
+ */
+JNIEXPORT void JNICALL DEF_JNI_OnUnload(JavaVM *vm, void *reserved)
+{
+ JNIEnv *env;
+
+ if (debugObj != NULL) {
+ if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
+ return; /* Should not happen */
+ }
+ (*env)->DeleteGlobalRef(env, debugObj);
+ }
+}
+
+JNIEXPORT jboolean JNICALL Java_java_security_SystemConfigurator_getSystemFIPSEnabled
+ (JNIEnv *env, jclass cls)
+{
+ int fips_enabled;
+ char msg[MSG_MAX_SIZE];
+ int msg_bytes;
+
+#ifdef SYSCONF_NSS
+
+ dbgPrint(env, "getSystemFIPSEnabled: calling SECMOD_GetSystemFIPSEnabled");
+ fips_enabled = SECMOD_GetSystemFIPSEnabled();
+ msg_bytes = snprintf(msg, MSG_MAX_SIZE, "getSystemFIPSEnabled:" \
+ " SECMOD_GetSystemFIPSEnabled returned 0x%x", fips_enabled);
+ if (msg_bytes > 0 && msg_bytes < MSG_MAX_SIZE) {
+ dbgPrint(env, msg);
+ } else {
+ dbgPrint(env, "getSystemFIPSEnabled: cannot render" \
+ " SECMOD_GetSystemFIPSEnabled return value");
+ }
+ return (fips_enabled == 1 ? JNI_TRUE : JNI_FALSE);
+
+#else // SYSCONF_NSS
+
+ FILE *fe;
+
+ dbgPrint(env, "getSystemFIPSEnabled: reading " FIPS_ENABLED_PATH);
+ if ((fe = fopen(FIPS_ENABLED_PATH, "r")) == NULL) {
+ throwIOException(env, "Cannot open " FIPS_ENABLED_PATH);
+ }
+ fips_enabled = fgetc(fe);
+ fclose(fe);
+ if (fips_enabled == EOF) {
+ throwIOException(env, "Cannot read " FIPS_ENABLED_PATH);
+ }
+ msg_bytes = snprintf(msg, MSG_MAX_SIZE, "getSystemFIPSEnabled:" \
+ " read character is '%c'", fips_enabled);
+ if (msg_bytes > 0 && msg_bytes < MSG_MAX_SIZE) {
+ dbgPrint(env, msg);
+ } else {
+ dbgPrint(env, "getSystemFIPSEnabled: cannot render" \
+ " read character");
+ }
+ return (fips_enabled == '1' ? JNI_TRUE : JNI_FALSE);
+
+#endif // SYSCONF_NSS
+}
+
+static void throwIOException(JNIEnv *env, const char *msg)
+{
+ jclass cls = (*env)->FindClass(env, "java/io/IOException");
+ if (cls != 0)
+ (*env)->ThrowNew(env, cls, msg);
+}
+
+static void dbgPrint(JNIEnv *env, const char* msg)
+{
+ jstring jMsg;
+ if (debugObj != NULL) {
+ jMsg = (*env)->NewStringUTF(env, msg);
+ CHECK_NULL(jMsg);
+ (*env)->CallVoidMethod(env, debugObj, debugPrintlnMethodID, jMsg);
+ }
+}
diff --git openjdk.orig/src/java.base/share/classes/java/security/SystemConfigurator.java openjdk/src/java.base/share/classes/java/security/SystemConfigurator.java
--- openjdk.orig/src/java.base/share/classes/java/security/SystemConfigurator.java
+++ openjdk/src/java.base/share/classes/java/security/SystemConfigurator.java
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2019, 2020, Red Hat, Inc.
+ * Copyright (c) 2019, 2021, Red Hat, Inc.
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@@ -30,13 +30,9 @@
import java.io.FileInputStream;
import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Properties;
-import java.util.regex.Pattern;
import sun.security.util.Debug;
@@ -58,10 +54,21 @@
private static final String CRYPTO_POLICIES_JAVA_CONFIG =
CRYPTO_POLICIES_BASE_DIR + "/back-ends/java.config";
- private static final String CRYPTO_POLICIES_CONFIG =
- CRYPTO_POLICIES_BASE_DIR + "/config";
+ private static boolean systemFipsEnabled = false;
+
+ private static final String SYSTEMCONF_NATIVE_LIB = "systemconf";
+
+ private static native boolean getSystemFIPSEnabled()
+ throws IOException;
- private static boolean systemFipsEnabled = false;
+ static {
+ AccessController.doPrivileged(new PrivilegedAction<Void>() {
+ public Void run() {
+ System.loadLibrary(SYSTEMCONF_NATIVE_LIB);
+ return null;
+ }
+ });
+ }
/*
* Invoked when java.security.Security class is initialized, if
@@ -170,16 +177,34 @@
}
/*
- * FIPS is enabled only if crypto-policies are set to "FIPS"
- * and the com.redhat.fips property is true.
+ * OpenJDK FIPS mode will be enabled only if the com.redhat.fips
+ * system property is true (default) and the system is in FIPS mode.
+ *
+ * There are 2 possible ways in which OpenJDK detects that the system
+ * is in FIPS mode: 1) if the NSS SECMOD_GetSystemFIPSEnabled API is
+ * available at OpenJDK's built-time, it is called; 2) otherwise, the
+ * /proc/sys/crypto/fips_enabled file is read.
*/
private static boolean enableFips() throws Exception {
boolean shouldEnable = Boolean.valueOf(System.getProperty("com.redhat.fips", "true"));
if (shouldEnable) {
- String cryptoPoliciesConfig = new String(Files.readAllBytes(Path.of(CRYPTO_POLICIES_CONFIG)));
- if (sdebug != null) { sdebug.println("Crypto config:\n" + cryptoPoliciesConfig); }
- Pattern pattern = Pattern.compile("^FIPS$", Pattern.MULTILINE);
- return pattern.matcher(cryptoPoliciesConfig).find();
+ if (sdebug != null) {
+ sdebug.println("Calling getSystemFIPSEnabled (libsystemconf)...");
+ }
+ try {
+ shouldEnable = getSystemFIPSEnabled();
+ if (sdebug != null) {
+ sdebug.println("Call to getSystemFIPSEnabled (libsystemconf) returned: "
+ + shouldEnable);
+ }
+ return shouldEnable;
+ } catch (IOException e) {
+ if (sdebug != null) {
+ sdebug.println("Call to getSystemFIPSEnabled (libsystemconf) failed:");
+ sdebug.println(e.getMessage());
+ }
+ throw e;
+ }
} else {
return false;
}